Novel Planar Nanodevices for Chemical Sensing Applications

Novel Planar Nanodevices for Chemical Sensing Applications In recent years, planar electronic nanodevices have attracted much attention due to their simple architecture, ease of fabrication and low cost of manufacture. Such devices address a wide variety of applications in printed and plastic electronics industry. Using this approach a new type of sensor, which is sensitive to different chemicals, has been developed and reported here. By exploiting the unique characteristics of semiconductor asymmetric nanochannels, a highly selective and sensitive planar nano-transistor based chemical sensor has been realised which can discriminate between wide range of chemical compounds in the ambient atmosphere. The active part of the sensor device was fabricated in a single nanolithography step and was tested using variety of chemicals including polar protic, polar-aprotic and nonpolar solvents. The sensing results showed that, all three solvent categories have exhibited unique chemical signature which could be identified with increased or decreased drain current depending on the analyte used. A significant rise in transistor drain current was observed when the device was exposed to polar aprotic solvents compared to polar protic and nonpolar ones. Further it has been noticed that the exposure of the device to polar protic solvents which has hydroxyl (–OH) functional groups in their molecular frame work has shown very high hysteresis in current voltage measurements. In contrast, the device has exhibited very little hysteresis when exposed to polar aprotic and non-polar solvents with later being the minimum of all. The effect of solvent’s polarity on the sensor’s drain current in terms of adsorption and desorption processes has been studied and reported here. Also the effects of water molecules in ambient air and hydroxyl groups on the device hysteresis behaviour have been investigated. As the gas sensing properties of the sensor are related to the chemisorption of gaseous species at its surface, a detailed understanding of the charge transfer in a chemisorption process is very important; hence most of the discussions in this report focus on explaining this complex phenomenon with a special emphasis on the role of surface states during sensing process. All the measurements were performed at room temperature and the responses were found to be very fast, reversible and reproducible over many cycles of vapour exposure and suggested the stability of the device to be very high. The simple, low-cost, multi-chemical sensing device described in this work could be useful for a variety of applications, such as environmental monitoring, sensing in chemical processing plants, and gas detection for counter-terrorism. Nanofabrication and Characterisation 4.1 Introduction Recent advancements in the area of micro/nanofabrication have created a unique opportunity to manufacture nanometer-sized structures with absolute precision that has wide range of applications ranging from electronic, optical, chemical and biological fields. (Springer Handbook of Nanotechnology Bhushan, Bharat (Ed.)  2nd rev. and extended ed., 2007, XLIV, 1916 p. 1593 illus. in color. With CD-ROM., Hardcover ISBN: 978-3-540-29855-7 This chapter will introduce two of such major top-down fabrication techniques namely photolithography and e-beam lithography followed by a brief description on atomic force microscopy and scanning electron microscopes which have been used in this project to fabricate and image the planar nanosensors reported in chapter 5. 4.2 Lithography In semiconductor processing area-patterning techniques are very important. Lithography is a process of transferring patterns from medium to the other ( ampere a. tseng, kuan chen, chii d. chen, and kung j. ma ieee transactions on electronics packaging manufacturing, electron beam lithography in nanoscale fabrication: recent developmentvol 26, no 2, april 2003 pp 141-149). These transferred patterns are then subjected to a development process that selectively removes either the exposed or unexposed resist depending on the resist nature. The positive resist removes the exposed part where as unexposed resist is developed away using negative resists as shown in the figure 4.1. The exposure systems may be any of these; ultraviolet light rays, X-rays, ion beams or electron beams. But this section focuses on the systems using ultraviolet and electron beams as their source. 4.2.1 Photolithography Photolithography is the most common patterning method, by which the shape and critical dimensions of a semiconductor device are transformed onto the surface of the wafer (got from lecture notes titled photolithography sly). This is the technique used to define the mesa structures and metallic contacts of the device described in this thesis. A photo sensitive resist is spun on to the substrate and exposed through a mask which transfers the patterns on the sample by means of UV light. Then the sample is developed to get the desired pattern as shown below. Figure 4.1. Typical photolithography process. The substrate (A) is  ¯rst coated by photoresist (B) and then exposed by UV radiation through a mask (C). The latent image is either removed (D) or  ¯xed (E) by a developer solution. Source : M. J. Madou, Fundamentals of microfabrication, 2nd ed., CRC Press (2002), p. 19. 4.2.2 Metal film deposition In order to perform electrical measurements on the device, we need to define the metal patterns, through which it can be connected to the electrical probe station.  So two contacts are formed, ohmic and schottky contacts through a process called lift off as shown in the figure 4.2. The GaAs substrate is coated with photoresist and the patterns are defined by photolithography. First the metal film is thermally evaporated and the unwanted metal laying on the resist is lifted off by dissolving the photoresist in acetone. To facilitate the ‘lift off’ of technique, photoresist edges with undercut profiles are desirable. This can be achieved by the treatment of photoresist with chlorobenzene before the UV exposure. Chlorobenzene swells inside the photoresist and makes its â€Å"skin† harder. After the exposure and the development, the profile of the photoresist edges forms an undercut [M. J. Madou, Fundamentals of microfabrication, 2nd ed., CRC Press (2002), p. 19. an d M. Hatzakis, B. J. Canavello, and J. M. Shaw, IBM J. Res. Develop. 24, 452 (1980).,], as shown in Fig. 3.3E. Source fundamentals of micro fabrication book Figure 4.2. Typical lift-of process. The substrate (A) is coated by photoresist (B) and then prebaked to partially dry the solvents (C). A dip in chlorobenzene follows to make the photoresist skin harder. (D) UV exposure through the mask. The edges of the patterns developed into the photoresist after such process show a typical undercut pro ¯le (E). The metal is evaporated onto the sample, forming a thin  ¯lm (F). The unwanted metal is then lifted o ® by dissolving the remaining photoresist in a solvent (G). Ohmic contacts (obeys Ohm’s law, linear I-V) They are essentially formed by a metal layer deposited on a highly-doped semiconductor. Because of the high-doping concentration a very thin Schottky barrier is formed, and the charge carriers, namely electrons and holes, can easily tunnel through. The substrate used in this research work consists of semiconductor heterostructures in which a two-dimensional electron gas (2DEG) was confined between undoped GaAs and doped AlGaAs layers. (R. Williams, Modern GaAs processing methods, Artech House (1990), Chapter 11.) The choice of metals for any given application will depend on conductivity, thermal stability, adhesion, nature of electrical contact with semiconductor (work function/barrier height), and ease of patterning. (got it grom sly lecture notes) A thin layer (~ 45-50 nm) of Au/Ge/Ni alloy which is the most common scheme for making alloyed ohmic contacts to n-type GaAs is used for this work and was evaporated onto the substrate surface at temperatures higher than 360 °C. In this alloy, the germanium diffuses into the GaAs and acts as a dopant, while nickel acts as a wetting layer and also assists the diffusion of Ge into the GaAs. Schottky contacts (rectifying, diode like I-V) Depositing a metal film on an undoped, or lightly n-doped, semiconductor whose electronic affinity is lower than the work function of the metal, will form a thick schottky barrier which is typically several hundreds of meV high, and the thermal energy gained by the electrons, about 26 meV at room temperature, is too low to permit thermionic emission over the barrier. (R. Williams, Modern GaAs processing methods, Artech House (1990), Chapter 12). When a bias is applied to the metal, the height of the energy barrier seen by the electrons injected from the metal into the semiconductor does not change, being fixed by the metal work function and the electronic affinity of the semiconductor. On the other hand, the barrier seen by the electrons injected from the semiconductor into the metal is increased/decreased by a negative/positive bias. This mechanism is responsible for the well-known rectifying effect observed in Schottky junctions [V. L. Rideout, Thin Solid Films 48, 261 (1978). [8] A. M. Cowley and S. M. Sze, J. Appl. Phys. 36, 3212 (1965).]. At negative biases, the Schottky junction essentially behaves like a capacitor: in substrates with embedded 2DEGs, it can be utilised as a gate electrode to modulate the 2DEG carrier concentration, e.g., for the fabrication of field-effect transistors. 4.2.2 Electron beam lithography (EBL) One of the modern approaches in dealing with nanoscale structures is e-beam lithography in which, electrons are accelerated by very high voltage, typically of 10s of kV and then focused onto a layer of polymer to create very fine patterns. EBL provides much higher resolution and more precise than photolithography or x-ray lithography: patterns with feature sizes well below 20 nm can be achieved in modern systems. EBL does not require the fabrication of masks as in the photolithographic process. There are two methods to expose e-beam on to the substrate surface (Rainer waser (Ed.) nanoelectronics and information technology, WILEY-VCH chapter 9, pp 234-236) 2005. Direct writing Projection printing Direct writing is the most common EBL approach and used for fabrication of the device reported here. In this approach, a beam of electrons directly impinges on the resist to form the pattern in a serial fashion. As shown in the figure 4.6, a direct writing system consists of a source of electrons, a focusing optics set, a blanker to turn on and off, a deflection system for moving the beam, and a stage for holding the substrate. Where as projection printing is used to project entire pattern simultaneously on to the wafer and can be divided into two ways; SACLPEL (scattering with angular limitation in projection electron beam lithography) and PREVAIL (projection reduction exposure with variable axis immersion lenses). However we will only concentrate on direct writing technique. Fig 4 dose test patterns of an array of self switching diodes (SSDs) fabricated using e-beam direct write. System configuration Figure 4.1. Simplified structure of a SEM column. The blue lines show the trajectory of the electrons. 4.2.4 E-beam process and proximity efect To perform electron beam lithography, PMMA (polymethyl methacrilate) resist was used which can be chemically changed under exposure to the electron beam. Final resolution of patterns in the e-beam resist and their eventual transfer into the substrate can be affected due to the imperfections in electron optics, the magnetic environment interaction, the overall thermal stability, the interaction between the beam and the substrate all play an equally important role in determining the ultimate system performance. When the electron beam strike the polymer film or any solid material, it losses energy via elastic and inelastic collisions collectively know as electron scattering. Elastic collisions change the direction of electron scattering, where as inelastic collisions lead to energy loss. As the electrons penetrate though the resist into the substrate, some of them undergo large angle scattering leading to undesired exposure that form backscattering. This causes additional exposure in the resist and is known as proximity effect. The magnitude of electron scattering depends on the density of the resist and substrate as well as the velocity of the electrons or the accelerating voltage (guozhong cao, nanostructures and nanomaterials, imperial college press, 2004, pp 280-300). (m.a. McCord and m.j.rooks, handbook of microlithoghraphy, micromachininbg and microfabrication, p.rai-choudary, Ed. Bellingham, WA:SPIE Optical engineering, 1997, ch 2, pp 139-249). The proximity effect is more severe in dense patterns, particularly when the separation between adjacent structures is less than 1ÃŽ ¼m. Since the amount of backscattered electrons depends on the substrate material, a dose calibration is necessary each time different substrates and resist thicknesses are used. Electron Scattering in Resist and Substrate The scattered electrons also expose the resist! Electrons, resist and substrates The smallest thing you can write with the ebeam depends on a large number of factors. These are the spot size used, the type of resist used, the thickness of the resist, the density of the features and the substrate material. When electrons are used to expose a pattern in resist it is not a simple process. Electrons enter the resist and hit the atoms of the resist, these will either forward scatter or back scatter. Backscattered electrons from the resist will leave the resist and, in general, do not contribute to the resist exposure, forward scattered electrons continue into the resist and contribute to the exposure. The thicker the resist the larger the forward scattering and the lower the resolution. High energy electrons (in our case 100kV) will go through the resist and deep into the substrate. Here they will again get scattered and will forward and backscatter. In this case the forward scattered electrons will be moving away from the resist and don’t contribute to the exposure, backscattered electrons from the substrate have a large contribution to the exposure. The higher the energy of the incoming electrons the deeper they will penetrate into the resist and hence the contribution to the resist exposure will be reduced. In the figure below you can see that going from 10kV to 20kV increases the penetration depth of the electrons from 1 µm to around 6 µm. At 100kV the penetration depth in Silicon is around 100 µm Figure schematic diagram of inter proximity effect and intra proximity effect The smallest feature sizes that can be achieved are when the features are isolated from one another. As you make your features closer together the backscatter from the neighbouring features will all contribute to the exposure and it will become harder to find the correct dose to correctly expose all your features. This is call proximity effects. There are 2 main effects of this; inter-proximity and intra-proximity. With inter-proximity when two features are close together the electrons from the exposure of on shape contributes to the dose of the neighbouring pattern. The larger and closer the features the worse this effect. With intra-proximity the dose in the centre of the pattern is larger than at the edges, and especially the corners. This is simply a geometric effect as there are less electrons contributing to the dose in the corners of the shape. The electrons need a path to ground. If you are using a conducting (or semi-conducting) substrate the contact with the holder is sufficient to provide a conducting path. If you are using an insulating substrate (fused glass, quartz) you will need to provide a conductive path for the electrons. This is normally done by evaporating a metal layer on top of the or underneath the resist. Aluminium or Chrome is are often good choices as they can often be easily be removed without effecting the resist, but you should check the chemical compatibility of your process with the removal procedure. Performing a Meaningful Dose Test Exposing a pattern correctly usually requires performing a preliminary test exposure referred to as a dose test.  In this test, the pattern is repeated several times on a test substrate.  Each repetition is performed at a different dose or set of doses creating a matrix of different exposure conditions.  Once the pattern is developed and pattern transfer has been performed the correct dose can be obtained through inspection in a suitable inspection tool (scanning electron microscopy, atomic force microscope, optical microscope, etc).  There are several issues which can impact the usefullness of a dose test.  Here are some guidelines: Use the same type of substrate. If there are films present on the surface of the substrate us a substrate with the identical film stack. For large arrays of features, shooting the entire array as a test is not an efficient use of time.  However, reducing the size of the array to an unrealistically small extent can give incorrent results during the test due to differences in the proximity effect.    ·Ã‚  Expose your patterns so that they are easy to locate.  For example, do not expose a test pattern consisting of a 500 micron x 500 micron array of 50 nm squares in the middle of a 150 mm wafer.  You will probably never find them.  Including some locating features (large lines or a box surounding the pattern) can help tremendously.  If you are exposing an array of patterns use as small of a repeat vector as possible.  This will make locating the entire array easier and minimize the chances of getting lost when travelling in between adjacent elements of the array. Proximity Effect As an electron from the writing beam strikes the surface of a substrate it undergoes various scattering events losing energy and causing the generation of secondary electrons.  The energy range of most secondary electrons falls between 1  and  50 eV.  Secondary electrons that are close to the substrate/resist interface are actually responsible for the bulk of the actual resist exposure process.  While their range in resist is only a few nanometers they create what is known as the proximity effect.  Simply put, the proximity effect is the change in feature size of pattern features as a consequence of nonuniform exposure.   While the dose from the primary beam may be uniform across an entire pattern, the contribution of secondary electrons from the substrate may differ depending on pattern geometry.  Two adjacent features will contribute a background dose of secondary electrons to each other resulting in a higher effective dose.  This causes a broadening of the exposed features.  This is particularly apparent with dense features (e.g. gratings).  Consequently, dense arrays of features may require significantly less dose from the primary beam to print correctly.   Pattern size can also be adjusted to compensate for this effect.  For example, 100 nm lines 100 nm apart are typically drawn in CAD as 90 nm lines 110 nm apart to get them to print correctly.  This strategy stops working at the edges and corners of patterns.  This sometimes requires the  the creation of dummy patterns or devices outside of the primary pattern region to get the main features of interest to print correctly.  One common practice is to draw a box around the pattern to normalize the dose in the primary pattern region. 4.3 Imaging nanostructures Characterisation and manipulation of individual nanostructures requires not only extreme sensitivity and accuracy, but also atomic-level resolution that leads to various microscopes that will play a central role in characterisation and measurements of nanostructured materials (guozhong cao, nanostructures and nanomaterials, imperial college press, 2004, pp 280-300). Nevertheless, when we think of microscopes, we think of optical or electron microscopes that can image an object by focusing electromagnetic radiation, such as photons or electrons, on its surface and gives the image with very high magnifications.   However, the images obtained with these microscopes can only provide the information in the plane horizontal to the surface of the object and do not give any information in vertical dimensions of object’s surface height and depth. This section deals with the imaging of surface topography and surface property measurements of planar sensor using AFM and SEM techniques, which can provide us with all necessary information in both horizontal and vertical planes. (www.afmuniversity.org/pdf/Chapter_1_.pdf pp 1-16) 4.3.1 Atomic force microscopy (AFM) AFM is a very high-resolution type of microscope from the family of scanning probe microscopy (SPM) with the resolutions thousand times the better than optical diffraction limit (http://en.wikipedia.org/wiki/Atomic_force_microscope). Unlike traditional microscopes, AFM does not rely on electromagnetic radiation to create an image. AFM is a mechanical imaging instrument that measures the three dimensional topography as well as physical properties of a surface with a sharpened probe. ((www.afmuniversity.org/pdf/Chapter_1_.pdf pp 1-16) AFM Basic principles It consists of very sharp tip attached to cantilever and is positioned close enough to the surface such that it can interact with the atomic/molecular forces associated with the surface. Then a collimated laser beam focuses onto the cantilever, which scans across the surface such that the forces between the probes remain constant. An image of the surface is then produced by monitoring the precise motion of the probe that can sense the movements as tiny as 0.1 nm. Such high resolution allows to image even single atoms, which are typically 0.5 nm apart in a crystal. Normally the probe is scanned in a raster-like pattern as shown in the figure 4. ((www.afmuniversity.org/pdf/Chapter_1_.pdf pp 1-16) Source : http://www.afmuniversity.org/index.cgi?CONTENT_ID=33 AFM probe: Cantilever and Tip AFM is a force sensor with a sharp tip used to probe the surface. When the tip at the end of the cantilever interacts with the surface, the cantilever bends, and consequently beam path also changes, causing the amount of light in the two photo-detector sections to change. Thus, the electronic output of the force sensor is proportional to the force between the tip and the sample. Tips used for probing the surface is usually made of silicon that have a radius of about 10-20 nm and can be coated by silicon nitride to make them harder, or by noble metals, such as gold and platinum, to locally probe electrical quantities or to induce chemical modifications. Optical detection and Piezo electric scanner In order to detect the cantilever movements, when the AFM is operating in ambient conditions, optical detection is used. Reflected light from the focused laser beam is collected by a photodiode and the cantilever deflection and torsion are detected as a change in the photocurrents of the photodiode elements, as shown in Fig. 4. In the typical AFM configuration the tip is kept still, and the imaging is performed by moving the sample with piezoelectric scanner also referred as piezo tube as shown in the figure 4b. By controlling the bias of one inner and four outer electrodes the piezotube can be moved in three dimensions.  This photosensitive detector measures the change in optical beam position and the change in cantilever height. Feedback control Feedback control is used in AFM for maintaining a  ¬Ã‚ xed relationship, or force, between the probe and the surface. According to the mode used, the feedback loop can be controlled either by the cantilever deflection (contact mode) or by the amplitude of the cantilever oscillation (dynamic modes). The typical feedback system used in contact mode is shown in Fig. 3.11. The feedback control operates by measuring the force between the surface and probe, then controlling a piezoelectric ceramic that establishes the relative position of the probe and surface.  Feedback control is used in many applications; Figure 2-4 illustrates the use of feedback control in an oven. Section 2.3 has a more AFM modes: Tip – sample interactions Depending on separation between tip and the sample a variety of forces can be measured by AFM. At shorter distances van der Waals forces are predominant. Where as these forces become negligible if the tip-sample distance increases.  Forces like electrostatic attraction or repulsion, current induced or static magnetic interactions comes into play at these larger separations. The tip-surface forces (approx.) is given by the following equation Fa = ΔU = 12 B/Z13 – 6A/Z7  attractive Repulsive B and A  are coffecients depend upon the surfaces involved.detectable forces for an AFM 1 nN in the contact regime and 1 pN in the noncontact regime (theory 10-18 N) (r. wiesendanger, â€Å" chapter 11. future sensors.† In h.meixner, r. jones, eds vol 8: micro and nanosensor technology /trends in sensor markets. ) Based on these interactions, AFM usually has two operational modes; contact mode and dynamic mode. Depending on resonant frequency shift of tip-sample, dynamic mode is further divided into tapping mode and non-contact mode. Imaging for this work was carried out in tapping mode. Contact mode Also called as repulsive-static mode, in which, the tip rides on the sample in close with the sample surface (low k). The force produced in the feedback loop is frictional force; hence, the tip might interact with the sample surface. Non-contact mode Also called as attractive-dynamic mode, in which the tip hovers 5-15 nm away from the sample surface. The force generated in the feedback loop is typically van der Waals forces. Applied force (dependent on height z) changes the cantilever oscillation frequency. Figure: AFM Measurement in the figure PSPD represents photosensitive detector. Tapping mode Also called repulsive-dynamic mode, in which the AFM tip taps the surface as it maps the height z. This type of mode eliminates the hysteresis due to the tip sticking on the sample. Also using this method there is less likely to damage the sample. Scanning electron microscopy Scanning electron microscopy is also one of the major techniques for imaging the nanostructures. Although AFM gives high-resolution images with absolute precision, it takes much of time to scan and image the surface area of the sample. Where by SEM can provide an alternative to AFM, which is very fat at imaging the samples in both horizontal and vertical directions. These schematics show the ray traces for two probe-forming lens focusing conditions: small working distance (left) and large working distance (right). Both conditions have the same condenser lens strength and aperture size. However, as the sample is moved further from the lens, the following occurs: the working distance  S  is increased the demagnification decreases the spot size increases the divergence angle  alpha  is decreased The decrease in demagnification is obtained when the lens current is decreased, which in turn increases the focal length  f  of the lens. The resolution of the specimen is decreased with an increased working distance, because the spot size is increased. Conversely, the depth of field is increased with an increased working distance, because the divergence angle is smaller. Comparison between AFM and SEM The AFM is more often compared with the electron beam techniques such as the SEM or TEM. With an AFM, if the probe is good, a good image is measured. (www.afmuniversity.org/pdf/Chapter_1_.pdf pp 1-16) the following comparison between AFM and SEM gives a fair idea of the capabilities for applications A comparison of the some of the major factors follows: FIGURE  1-8 Both  the AFM  and SEM measure  topography. However, both types of microscopes can measure other  surface  physical  properties.  The SEM is good for measuring chemical composition and the AFM is good for measuring mechanical properties of surfaces. Summary This chapter has covered the main processing and imaging techniques used for fabrication of nanosensor reported in chapter 5.  Patterning of metal contacts and mesa structures on to the substrate using photolithography have been discussed in detail. The mechanism for the thin film deposition of Au/Ge/Ni alloy for forming ohmic and schottky contacts have been presented followed by a brief discussion of wet etching for undercut profiles. e-beam lithography which can overcome the resolution limitation in photolithography has been introduced with a description of its basic elements followed a discussion on proximity effect. So overall, this chapter provides the reader with fundamental knowledge to understand the basic fabrication and characterisation process of which serves as a tool for better understanding the fabrication of planar nanodevices discussed in next chapter (i.e chapter 5). Bibliography Introduction The evolution of semiconductor industry has brought a revolutionary change in the way we live today. Right from the invention of germanium transistor in 1947 to the latest sensation graphene transistor, the world has seen some of the spectacular breakthroughs that the human kind had ever imagined few decades ago. In the last fifteen years, more than twelve noble prizes have been awarded for the research based in the field of nanotechnology. 1.1  Sensors and sensor science Life without sensors and sensing would be like an opera without singer or a violin without strings. Such life does not exist. Sensors and sensing, on the contrary, are basic properties of life that are responsible for the closed loop real time control of what is going on inside and how it reacts to the outside situation. From bacteria to plants and animals to human beings, all living organisms use their sensing organs for orientation and communication, for monitoring the environment and for their survival. (sensors and sensing in biology and engineering, springer wien newyork, 2003, friedrich g. barth, joseph a.c. Humphrey, timothy w.secomb pp3-34 chapter1 and 2.) Digital systems however complex and intelligent they are, must receive information from the outside world. Sensors act as an interface between various physical values and electronic circuits that ‘understand’ only a language of moving electrical charges. In other words, sensors are eyes, ears, and noses of silicon chips. Some sensors are relatively simple and some are complex, which operate on fundamental basic principles. Understanding of these devices generally requires an interdisciplinary background in fields such as physics electronics, chemistry etc. Thus, sensors research has brought a unique team of chemists, biologists, physicists electronic engineers, together on one platform, thus making it a truly interdisciplinary field. 1.1.1 The term ‘Sensor’ In this ever-changing world, sensors are becoming ubiquitous in our daily lives and play an important role in this process. Since the early 1990s, semiconductor industry has seen a tremendous growth in the development of variety of sensors. The technological trends in this field have made electronic products not only smaller and sleeker, but also more interactive and powerful.  These sensors with their improving performance–cost ratio will be the key components for the future nanoelectronic devices.(http://www.frost.com/prod/servlet/market-insighttop.pag?docid=140061375) The word sensor is derived from the Latin word sentire, which means, â€Å"to perceive†. A sensor i

Brain Based Learner Centered Model Education Essay

Traditional direction focuses on rote memorisation and callback with a bringing system which is teacher-directed. Traditional appraisal has focussed on multiple-choice and true or false trials which are designed to mensurate whether the pupils can reply the information contained in the text edition or delivered by the instructor. This traditional theoretical account is being challenged for non maximising the larning possible for all pupils, particularly where higher degrees of thought accomplishments are involved, such as in trouble-shooting Brooks ( Brooks, 1993 ) . Many researches ( Brooks, 1993 ; Caine, 1997 ) have been conducted on maximising studentis acquisition from which new instructional systems design theoretical account have emerged. But no unequivocal replies have originated from them. As Warrington ( 2007 ) summarises, the traditional or ifactory modeli of preparation was developed as a consequence of the industrial revolution, stressing which addressed obeisance, methodicalness, regard for authorization and a standardised course of study. This paradigm of instructional design created a ione-size-fits-alli theoretical account of instruction. In the twenty-first Century, leaders and pedagogues likewise are naming for alterations to run into the demanding demands of a technologically changing, competitory, and more planetary society ( UNESCO, 2000 ) . One country receiving heightened attending is the research in brain-based acquisition and its application to curriculum design and development. The neuroscience, biological science, and pedagogic research are edifying us on how the encephalon plants, and its deduction for the schoolroom ( Abbott, 1997 ) . Research workers in brain-based acquisition ( Caine, Caine, McClintic, and Klimek ( 2005 ) , Erlauer ( 2003 ) , Jensen ( 2005 ) , Slavkin ( 2004 ) , Wagmeister and Shifrin ( 2000 ) , Wolfe ( 2001 ) ) believe that traditional direction may impede the encephalon from larning. In visible radiation of this new information, decision makers, course of study developers, instructors, and other practicians in instruction, have become interested in brain-based acquisition because their work requires an understanding on how the encephalon receives, procedures, and produces information ( Bucko, 1997 ) . It is believed that brain-based acquisition has already had a dramatic impact for the instruction and larning procedure ( Sylwester, 1994 ) . 2.2 How Brain-Based Learning Impacts Education. Specifically based on decisions from research in neuroscience, professors from major universities have incorporated this information into books about larning. In conformity with the suggestions of Marian Diamond, U. C. , Berkeley ; Howard Gardner, Harvard University ; Renate and Geoffrey Caine ; Thomas Armstrong ; Candace Pert, Eric Jensen, schoolroom patterns can be modified by using new theories of instruction and larning based on recent findings. Advocates of brain-based larning insist that there is a difference between â€Å" brain-compatible † instruction, and â€Å" brain-incompatible † patterns and methods which can really forestall acquisition. Hart in Human Brain and Human Learning ( 1983 ) claims that learning without an consciousness of how the encephalon learns is like planing a baseball mitt with no sense of what a manus looks likeiits form, how it moves. Hart says that if schoolrooms are to be topographic points of acquisition, so â€Å" the organ of acquisition, † the encephalon, must be understood and accommodated. Although all acquisition can be, in the broadest sense, considered brain-based, Caine and Caine ( 1991: 31-32 ) specify brain-based acquisition as larning which acknowledges the brainis regulations for meaningful acquisition, and organizes learning with these regulations in head. Caine and Caine describe the nucleus rules directing brain-based instruction: * The encephalon is a parallel processor. It can execute several activities at one time. * The encephalon perceives wholes and parts at the same time. * Information is stored in multiple countries of the encephalon, and can be retrieved through multiple memory and nervous pathways.i * Learning engages the whole organic structure. All acquisition is mind-body: motion, nutrients, attending rhythms, and chemicals modulate learning.i * The human pursuit for significance is unconditioned. * The hunt for significance comes through patterning. * Emotions are critical to modeling and drive our attending, significance and memory. * Meaning is more of import than merely information. * Learning involves focused attending and peripheral perceptual experience. * We have two types of memory: spacial and rote. * We understand best when facts are embedded in natural spacial memory. * The encephalon is societal. It develops better in concert with other encephalons. * Complex acquisition is enhanced by challenge and inhibited by emphasis. * Every encephalon in uniquely organized. * Learning is developmental.i The deduction of these rules for preparation analysts and trainers has a direct impact on determinations associating to curricula, instructional methodological analysis, instructional stuff, and appraisal. 2.3 How Brain-Based Learning Helps Shape Knowledge Acquisition. The brainis acquisition capacity is eternal. Caine and Cain ( 1991, 1997 ) study that each healthy encephalon is equipped with a set of unbelievable characteristics: * An tremendous capacity for memory * The ability to self-correct and learn from experience * An unlimited capacity to make Theory on encephalon research has led to a comprehensive, instructional attack to maximise pupil acquisition, and to run into studentis single acquisition demands. The research on encephalon hemisphericity acknowledges the fact that there are differences in larning manners and that our definition of intelligence may be excessively limited. Keefe ( 1987: 16 ) defines larning manners as, icharacteristic cognitive, affectional, and physiological that serve as comparatively stable indexs of how scholars perceive, interact with, and respond to the acquisition environmenti . We could reason that this addresses the ihowi of larning. How do we treat and see cognition? How do we form and retain information? Do we near larning consecutive or randomly? The affectional constituents of larning include personality traits related to countries of duty, motive, continuity, and peer interaction ( Dunn and Dunn, 1978 ) . In other words, do we prefer to work entirely or in groups? Are we concerted or competitory? Traditional direction has ever emphasized abstract receiving and brooding processing, where learner-centered direction allows for all receiving and processing manners. In larning centered direction, course of study emphasizes the accomplishments of intuition, feeling, feeling, imaginativeness and syntheses, every bit good as the traditional manners of analysis, ground, and consecutive job work outing. Direction should be designed to link with all larning manners by utilizing jumping combinations of experience, contemplation, conceptualisation, and experimentation ( UCF Faculty Centre for Teaching and Learning ) . The assorted theories on larning available from Jung, Myers-Briggs, Mok, Keirsey and Bates, Hanson, Silver and Strong manners portion the belief that people learn otherwise. Learning depends on the capacities, intelligence, gender, sex, civilization, personality traits, and motive amongst others of persons. One widely used theoretical account used is Bernice McCarthyis 4MAT System. McCarthy ( 1997: 46 ) provinces that, iThe 4MAT system knows the typical manner that each scholar brings to the schoolroom, while assisting each pupil grow by get the hanging the full rhythm of larning stylesi . 4MAT ( McCarthy, 1981 ) is a constructivist theoretical account of teaching method which believes that effectual direction must travel through four indispensable stages of acquisition: scholar motive, conceptual command, application of thoughts, and originative synthesis. The 4MAT system is a theoretical account for instructional design, based on the research of larning manners and encephalon hemisphericity. The 4MAT System is based on left and right encephalon hemisphere, and emphasizes staff development. Dr. McCarthy tells us, that if all instructors taught in each of the four acquisition manners 25 % of the clip, all pupils in any category on any topic would be reached ( The Dunn & A ; Dunn larning manner theoretical account, 2001 ) . Alternatively of concentrating on the pupil ‘s learning manner, she focused on staff development developing all instructors to include all four acquisition manners in showing each larning undertaking. The work of John Dewy, Anthony Gregorc, Karl Jung, David Kolb, David Merrill, and Helizabeth Wetzig influenced McCarthy ( 1980 ) . David Kolbis experiential acquisition theory is the footing of the 4MAT system. Kolb`s research highlighted how experiential acquisition relates to cognitive development. This theory espouses the belief that acquisition is a uninterrupted procedure by which persons refine and incorporate a distinguishable set of independent systems that give significance to lifeis experiences ( McCarthy, 1997 ) . Kolbis theoretical account identifies a procedure through which four manners of human experience are engaged at different degrees to make a complete degree of understanding. The interaction between and among the manners of concrete experience ( CE ) , brooding observation ( RO ) , abstract conceptualisation ( AC ) , and active experimentation ( AE ) is required for acquisition ( McCarthy, 1980 ) . Honey and Mumford ( Sadler-Smith, 1996: 29-37 ) translated Kolbis work into a categorization system of larning manners based on the interaction between the manners: militants, reflectors, theoreticians, and pragmatists. * Militants like practical work such as labs, field work, observation exercisings and utilizing ocular beginning stuff for information. * Reflectors like to larn by watching others, by taking clip to see observations of their ain experience. * Theorists like talks, reading documents on subjects, sing analogies. * Pragmatists like simulations, instance surveies, prep. Therefore the four types might near larning in different ways. For illustration, pupils must larn to weld a pipe utilizing an electric-arc welding machine. Militants might merely get down utilizing it and experience their manner into it. Reflectors might hold a spell at utilizing it and so take clip to believe about what they have merely done. Theorists might get down by reading the manual. Pragmatists might get down the undertaking, but do frequent mentions to the pupil manual. The four types of acquisition in Kolbis theory can be seen as cyclical phases through which a scholar can come on ticker, think, feel, and do, every bit good as categorizing specific sorts of larning experience. The 4MAT system ( McCarthy, 1987 ) expanded on Kolbis theory by uniting research on encephalon hemisphericity. Harmonizing to Bernice McCarthy, developer of the 4MAT system, there are four major larning manners, each of which ask different inquiries and expose different strengths during the learning procedure. Harmonizing to McCarthy, i4MAT benefits instructors by giving them a model to plan larning activitiesi ( McCarthy, 1990 ) . This is besides the instance for instructional interior decorators who design plans of instructions, every bit good as schoolroom and workshop exercisings. Figure 1 shows the 4MAT system. Figure 2.1i The 4MAT System In the 4Mat System ( McCarthy, 1990 ) , pedagogues consecutive design lessons concentrating on four issues: * Personal Connections: How can I assist pupils do connexions between the content and their immediate lives? * Concept Development: How can pupils incorporate this information and see how it fits within the overall class? * Practical Applications: What can pupils make in the acquisition environment utilizing the information to see it at work? * Creative Integration: How can pupils use this information in original and more complex ways? The research on larning manners support that persons learn in different ways, differences in larning manner are related to forces motive and public presentation, acquisition is a uninterrupted procedure of distinguishing and incorporating experiences, and scholars expand and refine differing manners by sing them ( McCarthy, 1997 ) . The reappraisal of literature nowadayss noticeable deductions for instructional design and methodological analysis. The traditional mentality of the ifactory modeli of instruction and preparation, which dominated educational patterns for a century, has been redefined ( Darling-Hammond, 2003, p. nine ) . Teaching which emphasizes on rote memorisation and the acquisition of unrelated, stray facts does non ease the transportation of larning or use the encephalon expeditiously. Leslie Hart ( 1983 p.xiv ) provinces, iAs the effects of long development, the encephalon has manners of operation that are natural, effortless, effectual in using the enormous power of the astonishing instrument. Coerced to run in other ways, it functions as a regulation reluctantly, easy, and with abundant errori . The encephalon continually seeks significance and thrives in an environment rich with complex and meaningful challenges. For instructional stuff to be effectual, the information should be presented in a manner for the encephalon to pull out pattern, instead than enforce it ( Caine and Caine, 1991 ) . Instructional interior decorators must redefine the manner they write developing stuff by developing meaningful, connecting, and associating cognition. They need to develop a rich choice of methods and attacks which continually augment the learning experience. Several attacks compatible with brain-based acquisition are presently used to learn. Thematic units of direction, concerted acquisition, incorporating the course of study through interdisciplinary instruction, and whole linguistic communication direction are a few of these learning methods. Course of study interior decorators need to compose instructional stuff that engages studentis involvement through relevant life experiences in an ambiance of wonder and self-discovery. The course of study must be built around the alone endowments, strength, failing, and larning manners of the pupil in the schoolroom. Activities which are meaningful to pupils must be organized ( McCarthy, 1997 ) . The end of brain-based acquisition is to supply maximal benefit to all pupils without utilizing a ione-size-fits-alli expression. The more we approach meaningful, ambitious, and relevant acquisition in the schoolroom, the more antiphonal acquisition will be to our learner population which must be prepared to run into the challenges of the twenty-first Century. 2.4 3. What are the issues related to the execution of a learner-centered theoretical account? Rather than being seen as exclusions to the regulation that schools can non alter, the development of a little figure of advanced patterns and schools may alternatively reflect the regulation that schools can merely alter through the monumental attempt, unusual resourcefulness, and strong leading of cardinal persons or groups ( Hatch, 2000: 581 ) . Several factors that can curtail course of study invention have been identified in the literature. These relate to both the agent of alteration ( instructional interior decorators ) and the context in which the invention is taking topographic point. They include issues of clip, outlooks, inaccessibility of needed instructional stuffs, deficiency of lucidity about the reform, instructional designersi deficiency of accomplishments and cognition, and the initial mismatch between the iresidual ideologiesi and the rules underlying the course of study invention. Other obstructions relate to organisational agreements such as function overload, stiff programming of clip, describing systems, and failure of disposal to acknowledge and understand its function in alteration ( Nolder, 1990 ; Gross et Al. as quoted in Snyder et al. , 1992 ) . Research into curriculum airing and execution, and factors finding their success, found a focal point with the work of Fullan and Pomfret ( 1977 ) , who studied 16 instance surveies of attempted invention in American schools and found that all of them had resulted in some grade of failure. For about two decennaries, research workers examined the phenomenon of educational alteration, discussed its features and determiners, listed the accomplishments of the ‘change agent ‘ and suggested ways in which the procedure might be improved ( Fullan, 1993 ) . All of this research has a common subject, and that is that course of study alteration is a complex and hard procedure and requires careful planning, equal clip, support, support and chances for teacher engagement. Much of the literature recognizes the trouble of finding a individual theoretical account to accommodate all. Smooth and successful course of study alteration is tremendously hard and clip consuming and can non be accomplished without possible implementers going personally involved and accepting the alteration on their ain footings and harmonizing to their ain concepts of world. United Kingdom research workers ( Kelly, 1982 ; MacDonald & A ; Rudduck, 1971 ; MacDonald & A ; Walker 1976 ; Rudduck, 1991 ; Stenhouse, 1975 ) long have stressed the importance of a strong engagement function in course of study alteration and the demand for engagement of cardinal forces in the development and determination devising procedure. However, ownership is delicate, really hard to specify or step, and has many degrees. The human face of collaborative squads working creatively on specifying and make fulling their ain demands can be freakish and tense with struggle and emotion. On the other manus, collaborative development frequently needs to be steered and coached, and sometimes top-down determinations need to be made on theoretical issues which are outside developing analysts ‘ cognition and experience. Besides, developing analysts might necessitate to be coached to collaborate in alteration. 2.5 What is Action-learning? Action-learning ( AL ) is defined as a method that enables little groups to work on a regular basis and jointly on complicated jobs, take action, and learns as persons and as a squad while making so ( McGill and Beaty, 2002: 12 ) . The most common applications of Action-learning are in professional and managerial acquisition and development ( Revans, 1998 ) . Revan states that AL is widely used to pull off a work-based undertaking or plan in which set members are involved and for which they have a degree of duty and are hence able to realistically act upon their actions. It is besides used to happen and implement solutions to an issue that concerns how fit members operate in their work context, and one that they wish to better and that could profit from the support and challenge of the other members. Action-learning normally involves: * Participants tackle existent jobs ( no irighti reply ) in existent clip * Participants meet in little stable larning groups ( called iSetsi ) * Each Set holds intermittent meetings over a fixed plan rhythm * Problems are relevant to a participantis ain workplace worlds * A supportive collaborative acquisition procedure is followed in a Set * Process is based on contemplation, oppugning, speculation and defense * Participants take action between Set meetings to decide their job By these agencies, Action-learning seeks to throw a net around slippery experiences, and capture them as acquisition. The single makes sense of an experience by gestating it and generalising the replicable points ; and he plans for future actions based on the acquisition gathered. The set provides the forge in which an individualis actions are shaped through their ain personal contemplation and the oppugning penetration of fellow set members. Harmonizing to Revans, a cardinal point is that actions and results still remain the duty of the single participant. Action-learning provides a pattern field for larning to happen, whilst acknowledging that existent duty prevarications outside any schoolroom environment: it lies with the participants who must have the concern results. Further, in utilizing the organisation itself as a acquisition research lab, it does non necessitate any particular set of conditions to be in topographic point before it can be effectual. Action-learning plants good in a bureaucratism, in a level organisation, in houses culturally hostile to instruction and development, in houses promoting self-actualization ( Smith & A ; Peters, 1997 ) . It does so because its whole ethos is larning about the environing context, and larning to be effectual within it, therefore leveraging the prevalent civilization to its ain advantage. As a consequence, the development demands of the organizationis directors, executives and high-potentials are satisfied through activities which focus on the important current and future demands of the organisation. This leads to the justifiable charge of Action-learning as a narrow ( but deep ) larning docket, instead than a wide but superficial one. This development is addressed as a concern service proviso ; geared to supply exactly what is required, when it is required, where it is required, in the signifier in which it is required. 2.6 What is the Action-Learning Framework? The Center for Applied Research ( 2005 ) describes the action-learning model has holding four stages. Learning occurs in each one. 1. Frame i Define the particular job the group is seeking to turn to, research the premises made in specifying the job. Tie formal acquisition to job definition. 2. Charge i Set explicit ends ( deadlines and public presentation outlooks ) for the undertaking squad to carry through, and depict the procedure and staffing required. 3. Act i Execute undertaking work, following an agreed upon workplan. Connect to executive patrons and other cardinal stakeholders for counsel and blessing. 4. Reflect & A ; Review i Step back from action and reflect on experience, associating squad work to personal development. Consolidate lessons learned and integrate them into the undertaking as it unfolds. At the terminal of the undertaking, distribute lessons learned to the larger organisation in a meaningful manner. The procedure is iterative. The lessons learned by the undertaking squad should increase apprehension of the issues and lead to a re-framing of the job. Figure 2.2i the uninterrupted Action-learning procedure Having established what Action-learning is, who should be involved, and how it could help passage, it is of import to set up what the barriers to a successful Action-learning procedure could be. Clearly Action-learning could be a powerful tool but there will be things that will acquire in the manner of it being successfully implemented into any administration ( Marquardt, 1996: 406 ) . Some of these barriers are existent and some are simply perceived. Some are internal and some are external. 2.7 Barriers to Organizational Change Changing the manner we do ibusinessi creates pandemonium. But within pandemonium is an array of chances. Bush ( 2006 p.45 ) suggests that alteration can be inhibited by bing constructions within an administration ; this can be explained farther by O'Neill ( 2006 ) who implies that lasting squads who may hold settled work and societal forms are likely to be extremely immune to alter. This concurs with the instructions of Barbour ( 2005 p.45 ) who found that imembers are genuinely mutualist on each other and are close sociallyi . O'Neill went farther to propose that collaborative direction theoretical accounts such as Action-learning may merely see the indispensable early success where persons can elect to work on the footing of bing friendly relationship groups or where they feel that they personally will derive more by join forcesing than by moving in isolation ( 2006 p.85 ) . Goals and Aims Undefined ends and aims can be a barrier to Action-learning. Fabian and Simpson ( 2002 ) suggest that staffs are likely to hold uncertainnesss and insecurities at times of alteration. Therefore, clear ends and aims must be an built-in portion of the Action-learning procedure. Organizational Culture Organizational civilization is ithe form of shared basic premises – invented, discovered, or developed by a given group as it learns to get by with its jobs of external version and internal integrating – that has worked good plenty to be considered valid and therefore to be taught to new members as the right manner to comprehend, believe, and experience in relation to those problemsi ( Schein 1985 ) . Leadership Commitment Leadership committedness is identified in the literature as an of import and major factor to successfully implement Action-learning. In successful execution in any organisation, leading and civilization play a major function. Some of the features of leaders have been identified as their being airy and transformational ; they promote and O.K. of squad work, larning, engagement, and coaction. The leading manner of directors can drive an organisation to success by assisting them attain their ends and aims ( Rad, 2006 ) . Low tolerance of alteration Resistance is an inevitable response to any major alteration. Persons of course rush to support the position quo if they feel their security or positions are threatened. Folger & A ; Skarlicki ( 1999 ) claim that â€Å" organisational alteration can bring forth incredulity and opposition in employees, doing it sometimes hard or impossible to implement organisational betterments † . Undoubtedly, opposition to alter is a cardinal subject in alteration direction and should be earnestly considered to assist the organisation to accomplish transmutation. In drumhead, apprentice trainees need an instructional theoretical account that will dispute the acquisition potency and better fix them to fall in the work force. The traditional theoretical account does non fix trainees adequately, particularly where higher degrees of thought accomplishments are involved. Traditional instruction and acquisition theoretical accounts, which convey a formal, abstract procedure, are frequently far removed from the specificities of existent universe pattern. The current theoretical account was established in the early 1970 and was non revised since so. The traditional theoretical account is no longer allow to supply trainees with the accomplishments, cognition and attitude required to run into a fast changing and quickly turning company. From this state of affairs emerged a demand to revise the current instruction theoretical account with one that can concentrate in developing future employees that are capable of thought and work outing jobs. Curriculum alteration is a complex and hard procedure and requires careful planning, equal clip, support, support and chances for interior decorators and trainers engagement. To accomplish this ambitious end, action-learning appears to be the itooli of pick. Action-learning provides a tested and true method to help persons and administrations to accommodate to a quickly changing universe and to manage hard state of affairss altering a course of study more efficaciously. This attack is considered to be one of the most of import constructs to hold emerged in direction and organisational development. 3. Methodology This action-research is based on the undermentioned research inquiries: 1. What are the issues with JSC & A ; TUis current instructional development theoretical account with respects to Saudi Aramcois apprentices plan for new employees? 2. How might a learner-centered instructional development theoretical account aid decide the issues from our current instructional theoretical account? 3. What are the issues related to the execution of a learner-centered theoretical account? 4. How might Action Learning support a sustainable alteration in Company X course of study design unitis instructional design theoretical account? This survey adopted action-research as a methodological analysis to making alteration in Company X preparation and development. In this survey, action-research and action-learning are synonymous. The chief difference lies in that action-research is the coverage of the findings where action-learning is the procedure used for the action-learning undertaking. This attack is supported by Hase in iDeveloping Learner Capability through Action-Research: From Pedagogy to Heutagogy in the Workplacei ( 2006 ) . Using action-learning created a paradigm displacement in Company X occupation accomplishments unit. Employees who became members of the AL squad were no longer isolated in their pattern. In other words, the AL squad became a community of pattern where members connected through shared jobs, explored new possibilities to work out them, learned from each other and acted to present consequences to the organisation. 3.1 What is research? First it must be established precisely what educational research is. Research is the orderly probe of a capable affair for the intent of adding to knowledge. Research can meanire- searchi implying that the capable affair is already known but, for one ground or another, needs to be studied once more. Alternatively, the look can be used without a dash and in this instance it typically means look intoing a new job or phenomenon ( Borg and Gall, 1989 ) . Within the kingdom of educational planning, many things are ever altering: the construction of the instruction system, course of study and text edition s, manners of instruction, methods of instructor preparation, the sum and type of commissariats to schools such as scientific discipline research labs, text editions, furniture, schoolroom supplies, and so on. These alterations may take to an betterment, or a deterioration, in the quality of an educational system. In comparing, Pearson ( 1995:15 ) Tells us that researchiis the systematic procedure of roll uping and analysing information to increase our apprehension of the phenomenon under survey. It is the map of the research worker to lend to the apprehension of the phenomenon and to pass on that understanding to others. There are many types of research methods available to a research worker. Research methods are used to find, discover, interpret, and invent facts. The word research and its derivative agencies, â€Å" to look into exhaustively † .iResearch methodsiare used to come up with â€Å" new cognition † . Through probe and find procedures, research methods help to progress many different scientific Fieldss. In drumhead, research is a powerful activity and is conducted for specific ground: to reply a peculiar inquiry or to work out a specific issue ( Depoy and Guitlin, 1998 ) . 3.2 Qualitative or Quantitative Data? This research used quantitative and qualitative informations aggregation and analysis. Kerlinger argues that â€Å" There ‘s no such thing as qualitative informations. Everything is either 1 or 0 † ( Miles and Huberman, 1994: 40 ) . D. T. Campbell asserts that â€Å" all research finally has a qualitative foundation † ( Miles and Huberman, 1994: 40 ) . Many other research workers agree that these two research methods need each other more frequently than non. However, because typically qualitative informations involves words and quantitative informations involves Numberss, there are some research workers who feel that one is better ( or more scientific ) than the other. Another major difference between the two is that qualitative research is inductive and quantitative research is deductive. In qualitative research, a hypothesis is non needed to get down research. However, all quantitative research requires a hypothesis before research can get down. Specifying the function of the research worker is another cardinal difference between the two. In quantitative research, the research worker is ideally an nonsubjective perceiver that neither participates in nor influences what is being studied. In qualitative research, nevertheless, the research worker learns about a state of affairs by take parting or being immersed in it. These basic implicit in premises of both methodological analysiss guide and sequence the types of informations aggregation methods employed. Although there are clear differences between qualitative and quantitative attacks, some research workers maintain that the pick between utilizing qualitative or quantitative attacks really has less to make with methodological analysiss than it does with positioning oneself within a peculiar subject or research tradition. The pick of which attack to utilize may reflect the involvements of those carry oning or profiting from the research and the intents for which the findings will be applied. Decisions about which sort of research method to utilize may besides be based on the research worker ‘s ain experience and penchant, the population being researched, the proposed audience for findings, clip, money, and other resources available ( Hathaway, 1995 ) . Some research workers believe that qualitative and quantitative methodological analysiss can non be combined because the premises underlying each tradition are so immensely different. Other research workers think they can be used in combination merely by jumping between methods: qualitative research is appropriate to reply certain sorts of inquiries in certain conditions and quantitative is right for others. Others think that both qualitative and quantitative methods can be used at the same time to reply a research inquiry. To a certain extent, research workers on all sides of the argument are right: each attack has its defects. Quantitative research frequently prompts responses or people into classs they might non belong in, in order to do significance. Qualitative research, on the other manus, focuses excessively closely on single consequences and fails to do connexions to larger state of affairss or possible causes of the consequences. Rather than dismissing either attack for its downsides, we should happen the most effectual ways to integrate elements of both to guarantee that their surveies are as accurate and thorough as possible. It is of import for research workers to recognize that qualitative and quantitative methods can be used in concurrence with each other. For the intent of this research, qualitative informations were collected in analogue to quantitative informations and consisted of the followers: * Trainers and trainees questionnaires * Classroom observation, * In-depth interviews with trainers, and * Document Analysis ( particularly rating studies and gap analysis studies ) 3.3 Action-research Action-research is known by many other names, including participatory research, collaborative enquiry, Action-learning, and contextual action-research, but all are fluctuations on a subject. Put merely, action-research is ilearning by doingi – a group of people identify a job, do something to decide it, see how successful their attempts were, and if non satisfied, seek once more. While this is the kernel of the attack, there are other cardinal properties of action-research that differentiate it from common problem-solving activities that we all engage in every twenty-four hours. Gilmore, Krantz and Ramirez ( 1986: 161 ) specify action-research as: â€Å" Action-research†¦ aims to lend both to the practical concerns of people in an immediate debatable state of affairs and to foster the ends of societal scientific discipline at the same time. Therefore, there is a double committedness in action-research to analyze a system and at the same time to join forces with members of the system in altering it in what is together regarded as a desirable way. Carry throughing this twin end requires the active coaction of research worker and client, and therefore it stresses the importance of co-learning as a primary facet of the research procedure. † Several properties separate action-research from other types of research. Primary is its focal point on turning the people involved into research workers, excessively – people learn best, and more volitionally use what they have learned, when they do it themselves. It besides has a societal dimension – the research takes topographic point in real-world state of affairss and purposes to work out existent jobs. Finally, the initiating research worker, unlike in other subjects, makes no effort to stay degage, but openly acknowledges their prejudice to the other participants. Figure 3.1i Action-research System Model This survey intends to utilize the Action-learning methodological analysis. By its nature, Action-learning is a manner of speed uping peopleis acquisition and edifice capableness for managing disputing state of affairss to convey about alteration. If a alteration is desired, and the agencies by which the alteration should take topographic point is unknown, so Action-learning is a good manner to continue. This attack has been used in many organisations from different industry sectors every bit good as in educational environments where it is highly effectual. In response to our dynamic universe of work, current organisation frequently demands uninterrupted employee acquisition and development. In many state of affairss, a cardinal premise is that organisational endurance is dependent on acquisition, maintaining gait with, or progressing beyond the rate of alteration exhibited in the external environment ( Boshyk, 2002 ) . In the instance of Company X course of study unit, alteration in the manner course of study is designed is needed to back up trainers in presenting cognition, accomplishments and attitude utilizing a learner-centered attack. The traditional instruction theoretical account no longer suits the demands of immature Saudis. The company needs a work force whose cognition and accomplishments are built around critical thought instead than memorisation. Action-learning is a problem-solving tool. It is built around a job ( in this instance, a undertaking ) . Giving the chance to those that perform the occupation of planing course of study to place solutions and to implement them can significantly increase success and create sustainable alteration. Research demonstrates that larning without application is uneffective. An action without larning fails to develop your organisation ( Dixon, 2004: 18-23 ) . It marries analysis and action, contemplation and making, organisational development and bottom-line public presentation. By unifying these attempts, you drive to consequences in new ways and build capableness. In iAction Learning i Improving Organizational Performance through Team Learningi , the Center for Applied Research ( 2005 ) listed cardinal rules of successful Action-learning: * Executive Sponsorship is Crucial i In order to hold an effectual acquisition procedure, an executive patron must guarantee that proper resources are given to the undertaking and supervise the procedure and consequences. In this instance, the research was converted to a section enterprise, resources and budget was allocated, and the enterprise was tracked by upper-management. * Connect Action-learning to Real Business Issues i The push of the projectithe job to be solvedimust be relevant to the scheme or current demands of the organisation. Otherwise, the consequences of the undertaking might non be seen as important by the larger organisation, and the undertaking feels like an iexercise.i Since the end of this research was aligned with a existent business-need, recognized by both the business-lines and the preparation section, the result of it was of adequate significance for the company to apportion resources, clip and money to it. * Learning is Continuous i Learning happens throughout the procedure, non merely at the terminal. * The Future is Already Here i The Action-learning squad need non get down from abrasion. The solution to any job likely already exists someplace in the organisation. Action-learning uncovers and amplifies those solutions. * The Potential Solution Should Have Impact i A challenge posed by Action-learning is the perceptual experience that it produces excess work. If the procedure is linked to a long-standing or critical job, nevertheless, the procedure will be thought of as productive instead than merely excess work. * Get the Learning Noticed i Exporting outcomes from the undertaking into the wider organisation is critical. A procedure is needed to capture and administer larning throughout the organisation. To back up this research, a figure of action-learning meetings have been conducted within Company X course of study unit, sister units from the same division every bit good as the Training & A ; Development section. A absorbing result of this is that, although these meetings were meant to back up this specific action-learning research, a figure of turning enterprises to undertake similar issues are now being researched and implemented at all degrees. This procedure is improbable to be without its jobs. Chiefly, most people are unfamiliar with the basic processs and capablenesss of Action-learning. Second, Saudi Aramco directors are non used to nor inclined to swear and depute their control. Finally, directors may non be willing to supply the clip that Action-learning groups require to work out this job. An of import measure in Action-learning is to clearly specify the root jobs to work out. Action-learning advocators oppugning and contemplation to motivate a deeper degree of analysis, to prove premises, and to research possibilities. Within a group, work-based jobs are discussed and reframed in a acquisition context. Therefore, the research worker has gathered some cardinal determination from Company X recognizing organic structure the Accrediting Council for Continuing Education and Training ( ACCET ) which conducted a comprehensive rating of the course of study design, bringing, and direction of Company Xis apprenticeship plan for new employees ( APNE ) . The aim of the rating, as specified by Company X decision makers, was to find to what degree the APNE plan is run intoing its ends and to urge alterations or betterments that might be warranted. The information from this audit were gathered in October and November 2008 by the attesting organic structure during sites visits. In 20 11, another rating, which was aimed at a specific stage within the APNE plan, was conducted by the Centre of Applied Linguistic ( CAL ) , a non-profit administration. Both administrations, ACCET and CAL came up with really similar findings. Since these visits, the state of affairs has non improved. The undermentioned findings were highlighted in the ACCET study and were used to specify the issues with our plan of direction and to organize the footing for traveling the course of study from teacher-centered to learner-centered. Table 3.1i Certifying Bodyis Findings ACCET Standard h the mission and ends. The establishment maintains all needed certification. The action-learning squad for this undertaking was 14 members of staff chosen at random from the course of study unit. One participant was selected from the five group leaders, one from the two available senior interior decorators, seven from the 24 available interior decorators from the course of study author group, one from the learning staff, one from the in writing group, and one from the papers design staff. Table 3.2 explains the sample for the qualitative research and will be used to guarantee the namelessness of respondents in this study. Table 3.2iSample Group Code of Interviewee The acquisition penchants study was administered to five groups of 12 pupils from each occupation of the APNE plan, chosen randomly: Metallic elements Mechanicss, Welding, Operators, Process Control Technicians, and Maintenance Technicians. The instruction penchants study was administered to one of the two instructors responsible of learning the predating trades. A semi-structured interview was used with each supervisor responsible of each of the five occupation ladders to compare with the positions collected via studies and observations from the schoolroom. This enabled the research worker to reflect similarities or differences between what was compiled from the studies, observations and interviews of the trainees and the trainers. In this research, affecting a smaller sum of topics reduces investing in clip and money. It is believed that samplingican really be more accurate than analyzing an full population, which in this instance is over 2600 trainees, and 650 trainers in five different locations throughout the state, because it affords the research worker a batch more control over the topics. Finally, holding a smaller information set will let the research worker to avoid human mistake when inputting and analysing the information set. On the other manus, there is room for possible prejudice in the choice of suited topics for the research. This may be because the research worker selects topics that are more likely to give the coveted consequences, or that the topics tend to choose themselves. 3.5 The Data Collection Tools Many ways to garner informations are required to set about the research and as Denscombe ( 2007:3 ) explained, there is no 1 right way to take. Different schemes should be used depending on the issue to be undertaken. Triangulation requires the aggregation of informations from a assortment of beginnings, in a assortment of ways, with a assortment of positions. In this survey, interviews, audit studies, questionnaires, and observations were used to roll up informations in a assortment of ways. 3.5.1 The Interview The interview as a information aggregation tool was considered as it provides an chance to roll up better or more informations at less cost ( Ribbins, 2007 ) . The research worker has decided to utilize semi-structured interviews as the method for roll uping my qualitative informations as it fosters a deeper apprehension of the positions of the interviewees. The semi-structured interview can be described as flexible, leting new inquiries to be brought up as a consequence of what the interviewee says. In a semi-structured interview, the interviewer has by and large a model of subjects to be explored ( Lindlof and Taylor, 2002: 195 ) . The interviewing technique is employed in this research because it serves the explorative nature of the survey. It seeks in-depth information about accomplishment formation results. The latter issue and the information to be obtained are really sensitive to interviewees in this survey. Therefore, questioning is the most appropriate attack. This can be achieved through a little sample of representatives from selected sectors instead than concentrating on a big scale population. Interviewing besides enables the interviewer to supplement information obtained from responses, with those gained from observation of gestural reactionsi ( Kumar, 1999:115 ) . Furthermore, this qualitative research falls within the context of detecting possible barriers and challenges for organisational alteration by implementing a new instructional attack. Therefore, it is indispensable to forestall any possibility of misinterpretation of research inquiries that will be asked as the interviewer can either repetition or explicate such inquiries in the topographic point which can merely be accomplished through face-to-face interviewing. The usage of standardised instructions warranted that each supervisor had a similar engagement. Associating the closed inquiries from the trainees and trainers questionnaire meant that the responses of supervisors could be straight compared to the questionnaires without the demand for a deep analysis from the research worker. 3.5.2 The Questionnaire A questionnaire was administered to the trainees and the trainers by the research worker based upon Gary J. Contiis ( 1983 ) work. The Principles of Adult Learning Scale ( PALS ) was developed and validated for mensurating congruency between big instruction practicians ‘ existent discernible schoolroom behaviour and their uttered belief in the collaborative teaching-learning manner. The PALS is self-administered, has 44 points, and can be completed in approximately 10 to 15 proceedingss ( Conti, 1990 ) . There are several grounds behind taking this instrument ; it is easy to administrate, it is easy to construe, it is self-scoring, and non scored by an external agent, it is comparatively speedy to administrate and finish, it has easy reportable graduated tables, and it has dependability and cogency supported by the research. PALS leads to a individual mark and which can be divided as follows: * Teacher centered-extreme: 0-105 * Teacher centered – really strong: 106-125 * Teacher centered – increased: 126-145 * Learner centered-increased: 146-165 * Learner centered – really strong: 166-185 * Learner centered – extreme: 186-205 About everyone has had some experience finishing questionnaires and they by and large do non do people discerning. They are less intrusive than telephone or face-to-face studies. When respondents receive a questionnaire, they are free to finish it on their ain timetable. Unlike other research methods, the respondent is non interrupted by the research instrument. Written studies are non capable to this prejudice because there is no interviewer. On the other manus, the deficiency of an interviewer limits the research worker ‘s ability to examine responses ( Walonick, 1993 ) . Contrasting with in the flesh interviewing, there are no verbal or ocular hints to act upon a respondent to reply in a peculiar manner. Many research workers have reported that interviewer voice inflexions and idiosyncrasies can bias responses ( Barath and Cannell, 1976 ) . Written studies are non capable to this prejudice because there is no interviewer. As suggested by Bell ( 2007 ) the research worker needs to avoid ambiguity, taking and dual inquiries to guarantee the responses are valid and utile in the research. Some might reason that the deficiency of an interviewer limits the research worker ‘s ability to examine responses. Structured questionnaires frequently lose the â€Å" spirit of the response † , because respondents frequently want to measure up their replies ( Walonick, 1993 ) . By leting frequent infinite for remarks, the research worker can partly get the better of this disadvantage. 3.5.3 Observations Observation is a manner of garnering informations by watching behaviour, events, or observing physical features in their natural scene. Marshall and Rossman ( 1995 ) define observation as â€Å" the systematic description of events, behaviours, and artefacts in the societal scene chosen for survey † ( p.79 ) . Observation methods are utile to research workers in a assortment of ways. They provide research workers with ways to look into for gestural look of feelings, determine who interacts with whom, hold on how participants communicate with each other, and look into for how much clip is spent on assorted activities ( Schmuck, 1997 ) . Observations, as used in this research, enabled the research worker to formalize the consequence of both studies. Participant observation in their acquisition environment allowed the research worker acquire the feel for how the stuff is being taught and evaluated. It besides gave the research worker a better cognition of the learning civilization of the trainees against the teaching civilization of the trainers. The research worker conducted a focussed observation utilizing the same PALS questionnaire administered to the trainers and trainees. An excess field was added for observation notes. A focussed observation emphasizes observation supported by interviews and questionnaires, in which the participants ‘ penetrations guide the research worker ‘s determinations about what to detect. As Wolcott ( 2001 ) notes, one should take note of what he is detecting, what is being put into the field notes and in how much item, and what one is nil about the research worker ‘s personal experience in carry oning the research. 3.6 Reliability and Validity The research worker realises the importance of dependability and cogency of the measurement instruments. Schumacher and Macmillan ( 1993:404-406 ) province, iQualitative research workers typically use as many schemes as possible to see the cogency of the design.i The traditional standards for cogency find their roots in a rationalist tradition, and to an extent, positivism has been defined by a systematic theory of cogency. Within the rationalist nomenclature, cogency resided amongst, and was the consequence and apogee of other empirical constructs: cosmopolitan Torahs, grounds, objectiveness, truth, actuality, tax write-off, ground, fact and mathematical informations to call merely a few ( Winter, 2000 ) . Joppe ( 2000 ) gives the undermentioned history of cogency in quantitative research: iValidity determines whether the research truly measures that which it was intended to mensurate or how true the research consequences are.i Researchers normally control cogency by inquiring a series of inquiries and will frequently look for the replies in the research of others. Reliability as defined by Joppe is: iiThe extent to which consequences are consistent over clip and an accurate representation of the entire population under survey is referred to as dependability and if the consequences of a survey can be reproduced under a similar methodological analysis, so the research instrument is considered to be reliablei ( Joppe: 2000: 1 ) . Rooted in this commendation is the thought of repeatability of consequences or observations. Although the research worker may be able to turn out the research instrument repeatability and internal consistence, and, hence dependability, the instrument itself may non be valid. To achieve methodological and answering triangulation in this research, the research worker used several schemes such as observation, interview, papers analysis, and questionnaire. Bush ( 2006 ) stated that look intoing requires triangulation, which means at the data-collection phase seeking farther grounds including speaking to others, analyzing paperss and detecting action. 3.7 Ethical Considerations Because action-research is carried out in real-world fortunes and involves near and unfastened communicating among the people involved, the research worker must pay close attending to ethical considerations in the behavior of his work. Confidentiality must be a given. Richard Winter ( 1996 ) lists a figure of rules which were respected throughout the survey: * iMake certain that the relevant individuals, commissions and governments have been consulted, and that the rules steering the work are accepted in progress by all. * All participants must be allowed to act upon the work, and the wants of those who do non wish to take part must be respected. * The development of the work must stay seeable and unfastened to suggestions from others. * Permission must be obtained before doing observations or analyzing paperss produced for other intents. * Descriptions of othersi work and points of position must be negotiated with those concerned before being published. * The research worker must accept duty for keeping confidentiality. * To this might be added several more points: * Decisions made about the way of the research and the likely results are corporate * Research workers are expressed about the nature of the research procedure from the beginning, including all personal prejudices and involvements * There is equal entree to information generated by the procedure for all participants * The outside research worker and the initial design squad must make a procedure that maximizes the chances for engagement of all participants. The research worker must besides guarantee that the research participants give their consent voluntarily. Additionally, this consent can be withdrawn at any clip ( TCPS2, 2011 ) . This is confirmed by Busher and James who province that ia cardinal rule for building ethical research is that of voluntarism by the participant when prosecuting with research ( Busher and James, 2007: 110 ) . Besides confidentiality will be achieved by keeping namelessness. Hart ( 2003 ) describes namelessness as mentioning to hiding the individuality of the participants in all paperss ensuing from the research. In carry oning interviews, ethical issues are one of the chief concerns. Ethical guidelines published the University of Leicester Code of Practice ( 2012, Online ) were used to steer the research procedure. Following these rules, the action-learning squad was assembled for this research. An enterprise was proposed to the section caput. From this proposal, the action-learning squad met and developed a formal undertaking proposal. The undertaking proposal was submitted to the Accelerated Transformation Program squad and was subsequently approved. The squad met once more and a undertaking program was elaborated in audience with everyone in the action-learning squad. A formal presentation about Action-learning was conducted and the action-learning squad elaborated land regulations to be followed for each action-learning set. The undermentioned action-learning rules and land regulations were charted and adopted: * Merely in a group where it is safe to unwrap ignorance, admit failing and ask for aid is it possible for the job proprietor to larn at sufficient deepness for him to develop as an person * Keep to external and internal clip boundaries to guarantee each individual has a just portion of the clip available. * Statements merely in response to inquiries ; anyone can inquire inquiries. * Merely one at a clip. Merely one individual at a clip is the issue holder, for that clip, the set members are at that place to listen and to enable. If the job proprietor is non acquiring the kind of aid that is needed, he should state so. * Team members have authorization to step in whenever he identifies larning chances. * Team members need to be able to seek out new ways of relating, cognizing that they will acquire constructive feedback and non be blamed for acquiring it incorrect. * Team members need to acquire over any impression of fight or ibetter thani impressions. * Bing a member is voluntary. Any members can elect to go forth the action-learning squad at any minute without accounts. Additionally, supervisors were informed that they could retreat from the interview at any clip and approved verbally at the terminal of the interview to their informations being used. By returning the questionnaire trainees and trainers gave understanding to utilize their informations. Finally, since the research participants have the right to stay anon. , all information solicited was treated with confidentiality and used for the intents of the thesis merely. The paperss provided by the participants were returned or shredded upon petition. Hart ( 2003 ) describes namelessness as mentioning to hiding the individuality of the participants in all paperss ensuing from the research. All participants were guaranteed that the information solicited was treated with maximal confidentiality. 4. Analysis The intent of this survey was twofold. One: to place the acquisition manners of company X trainees enrolled in the industrial proficient colleges and the instruction manners of the teachers. Two: to find if the usage of action-learning can alter the bringing of course of study from a teacher-centered theoretical account to a encephalon based learner-centered theoretical account. This chapter will explicate the analysis conducted to place the current learning-teaching manners, discourse how the information collected helped the action-learning squad place the job, and show how the usage of action-learning can be an efficient tool in altering Company X preparation design and bringing. 4.1 Finding 1 Based on the PALS trainers and trainees questionnaire, the research worker was able to specify the particular job the action-learning squad is seeking to turn to. The Principles of Adult Learning Scale ( PALS ) Conty ( 1983 ) was developed and validated for mensurating congruency between big instruction practicians ‘ existent discernible schoolroom behavior and their uttered belief in the collaborative teaching-learning manner. PALS, trainers and trainees versions, is self-administered, has 44 points, and can be completed in approximately 10 to 15 proceedingss ( Conti, 1990 ) . One-half of the points are worded positively, the others negatively and are arranged indiscriminately. The PALS questionnaires factor tonss are calculated by summing the value of the responses for each item/question in the factor. Then, the research worker compares each traineris factor mark values to their several agencies. Both groups were given a consent signifier. The PALS trainersi questionnaires were distributed to five trainers during spring of 2012. Engagement to the study was non compulsory. Surveies were collected and placed into an envelope which was sealed before the trainers. Data analysis was conducted before the schoolroom observations took topographic point. The PALS is interpreted as follows: If the mark is equal to or greater than each several mean, so this suggests that such factors are declarative of the traineris learning manner. Those tonss that are less than the average indicate possible countries for bettering a more learner-centered attack to learning. An person ‘s entire mark on the instrument is calculated by summing the value of each of the seven factors. Tonss between 0-145 indicate that the manner is iteacher-centered.i Tonss between 146-220 indicate that the manner is ilearner-centered.i The overall PALS mark can be broken down into seven factors as shown in Table 4.1. While the overall mark indicates the trainer ‘s general manner, the factor scores place specific elements that make up this manner. A high mark on each factor represents support of the construct implied in the factor, while a low mark indicates support of the opposite construct Table 4.1i Factor Score Valuess Factoring procedure Of the five trainers ‘ that responded to this study, all five of their tonss were below the average mark of 146 which indicated that they all prefer a instructor centered attack to instruction. 4.1.1 Trainees Questionnaire The 2nd aim of this study was to find the pupils larning penchants against the trainers learning penchants. The trainees from the same group of trainers participated in this survey. The pupils were given the questionnaire during one of the category Sessionss in the spring term of 2012. A treatment of larning manners and expressed instructions on how to finish the study preceded the distribution. Student engagement was voluntary, so merely completed studies were placed in an envelope. After all the studies had been collected, the envelope was sealed and taken by the research worker for analysis of the informations. The consequences were so analysed and compared with the Index of Learning Styles ( ILS ) formulated by Richard M. Felder and Linda K. Silverman as per the tabular array below. The Index of Learning Styles was created in 1991 by Richard M. Felder, a chemical technology professor at North Carolina State University, and Barbara A. Soloman, so the coordinator of reding for the N.C. State First-Year College. The four acquisition manner dimensions of the instrument were adapted from a theoretical account developed in 1987 by Dr. Felder and Dr. Linda K. Silverman, an educational psychologist so at the University of Denver. The first version of the instrument was administe

Causes of Teenage Obesity

One of the offshoots of some of the eating disorders is teenage obesity. Obesity is a condition where the fat percentage of a child is over 32% for girls and 35% for boys or when the child's body weight is over by 20% of their ideal weight according to their height. It is not necessarily linked to eating disorders, but eating disorders like Bulimia Nervosa and Binge Eating can be linked to obesity. Also, while obesity can be problem at different stages of life (for example, even a 7 year old child can classed as obese), most eating disorders are related to the teenage years. Obesity amongst children is one of the growing health concerns for parents across the world and this health risk is growing at an alarming rate. Research indicates that most obese children grow up to be obese adults. There are several factors that lead to obesity. Below are some of the key causes of obesity: Physical inactivity: This is one of the biggest causes of teenage obesity. Associated essay: Teenagers and Their Leisure Time With teenagers spending most of their time in front of the television, playing computer games or on mobiles with their friends and lack of interest in extra-curricular activities after school or college and lack of exercise are some of the key causes of teenage obesity. Bad eating habits: Another big reason for teenage obesity is bad eating habits. The surge in the consumption of high fat foods like burgers, chips, fizzy drinks and fries has already been condemned and treated as one of the main causes of child obesity. Genetic Patterns & Family Behaviour: Genetic patterns and family behaviours are also important causes of obesity and it is difficult to separate the two. Whilst the probability of obese parents having obese children is around 30%, it is also true that obese parents often have poor eating habits and condone poor family nutrition, resulting in overweight kids. Chemical or hormonal imbalances: Another major reason for obesity, especially amongst teenagers, is hormonal changes. Teenagers undergo significant hormonal changes as they reach puberty, which could trigger cravings for certain foods or over-consumption of food. Lower metabolism: Some teenagers have the tendency to retain or conserve body energy and this trait is easily visible from early childhood, where growth milestones in a child seem to be much quicker than usual. The first two reasons outlined above (lack of physical activity and lack of proper diet) are the primary reasons for obesity amongst teenagers. As parents, you need o take your teenager's obesity issue very seriously and get medical and professional help if you see your child being unable to partake in any sport or physical activity or if school/college authorities express concern over their weight or feel that your teenager is overweight. In the book â€Å"Solving Teenage Problems†, several tips to deal with teenage obesity have been provided. Along with this the book also touches upon various eating disorders, which can lead to teenage obesity – their causes and tips to solve them.

Essay on Response to “on Being an Atheist” - 1531 Words

Response to â€Å"On Being an Atheist† By: Casandra Privette In his article, On Being an Atheist, H.J. McCloskey tried to show that atheism is a more reasonable and comfortable belief than that of Christianity. McCloskey argued against the three theistic proofs, which are the cosmological argument, the teleological argument and the argument from design. He pointed out the existence of evil in the world that God made. He also pointed out that it is irrational to live by faith. In my response, I will argue that McCloskey’s article is one-sided and thus flawed in his conclusion that atheism is more comforting than Christianity and when one examines all the evidence, Christianity is truly a source for great comfort today. McCloskey†¦show more content†¦God is all-powerful and can create something from nothing at His will. This was true in the Bible when God created Adam from dust and Eve from Adam’s rib. This could have also been true if God chose to use evolution as His means of creating the universe, which I don’t believe he did. The teleological argument begins from the fact that that the natural world appears to exhibit orders and designs and therefore there must be an intelligent designer. The philosopher, Thomas Aquinas, claimed that many entities in nature act for an end. Examples of this fact are animals, which are self-regulating. They have a will to survive in nature and the skills necessary for this survival. Man’s complex organ structure is another example of the work of an intelligent designer. It is impossible to explain the existence of these wonderful creations as happenstance cell mutation. After all, scientifically speaking, when cell mutation occurs, the results are usually not positive. They result in weaker, defective cells being produced. If man is more complicated than a monkey, how can this be a rational argument? 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