L-Shaped Array for Multi-frequency Interferometry Telescope

L-Shaped Array for Multi-frequency Interferometry Telescope Abstract An array of eight antennas with different configuration, more precisely an L-shaped array has been built for the Multi-frequency Interferometry Telescope for Radio Astronomy (MITRA) project. It consists of quite newly designed Dual Polarised Log Periodic Dipole Antennas (DPLPDA). The first stage of the project was to test the existing array of DPLPDA antennas in a parallelconfiguration in the North South direction and to bring forward different improvements. Also, comparision of data was done with the Durban University of Technology (DUT) at Durban RSA where a similar array was constructed. Next, UV coverage of different arrays were simulated. After that, the DPLPDA were constructed.After setting up the array, the antenna response of each antenna was tested and the results obtained was interpreted. The final test was to test the complete array after combining all the antennas. CHAPTER 1 Introduction and Overview 1.1Introduction 1.1.1Radio Astronomy Radio astronomy is the study of celestial objects that emit radio waves.In the 1930’s, Karl Jansky (1905-1950), working for the Bell Laboratories, was trying to determine the origin of the source of noise interfering with radio voice transmissions. He built a steerable antenna designed to receive radio waves at a frequency of 20.5 MHz. From the observations, he found that the period of the earth’s rotation relative to the radio source was 23 hours and 56 minutes instead of 24 hours. Hence, he concluded that the source was follwing sidereal time. He also observed that the strongest radiation was coming from the centre of our Milky Way galaxy.Inspired by Jansky’s work, Grote Reber (1911-2002) built a parabolic radio telescope of diameter 9m in his back yard, in 1937. After several trials, Reber successfully detected radio emission from the Milky Way, in 1938, confirming Janskys discovery. This led to the discovery of a range of celestial objects, such as radio gala xies, quasars, and pulsars with radio emission with various types of antennas. [1] 1.1.2.1 Radio Interferometry Radio interferometry are arrays of radio antennas that are used inastronomicalobservations simultaneously to simulate singletelescopesof very largeapertures and are used to make measurements of fine angular detail in the radio emission. Radio interferometry enable measurement of the position of radio sources with accuracy to allow identification of other objects detected in the electromagnetic spectrum. Michelson and Pease made the discovery of the interferometric techniques in 1921. They were able to obtain sufficiently fine angular resolution to measure the diameters of some of the nearer stars such as Arcturus and Betelgeuse. [2] 1.1.2.2 Aperture Synthesis Aperture Synthesis or Synthesis Imaging is a type of interferometry that correlates radio signals obtained from a collection of telescopes or antennas to produce images. These images have the same angular resolution as that of the size of a single and a much larger telescope or antenna. Aperture synthesis was first discovered by Sir Martin Ryle (27 September 1918 – 14 October 1984) and coworkers from the Radio Astronomy Group at Cambridge University at radio wavelengths. In 1974, Martin Ryle was the first astronomer awarded a Nobel Prize. [3] Very Long Baseline Interferometry(VLBI) also makes use of radio interferometric techniques. TypicallyVLBIrefers to experiments that do not process their data in real time, but record it for latercorrelation to produce the resulting image. It achieves ultra-high angular resolution and is a multi-disciplinary technique. VLBIis used in measuring pulsar parallaxes andproper motion, resolving the cores of radio galaxies and fets from supermassive black holes, among others. [14] Some of the commonly used radio interferometers are: the Very Large Array (VLA) in Socorro, New Mexico,USA; It consists of 27 radio antennas, each of diameter 25 metres, along three arms of a Y-shaped configuration spread over three 21 kilometres tracks providing 351 baselines. [4] the Multi-Element Radio Linked Interferometer Network (MERLIN), operated by Jordrell Bank Observatory; It is an array of 7 radio telescopes spread across Britain with separation up to 217 kilometres operating at frequencies between 151 MHz and 24 GHz. [5] the Australia Telescope Compact Array (ATCA) in Narrabri, NSW, Australia. The telescope is an array of six identical 22 metres diameter dishes with five movable dishes along a 3 kilometres railway track and the sixth one is 3 kilometres west at the end of the main track. The maximum baseline length is 2.7 kilometres and the observing frequencies are from 300 MHz to 8 GHz.[6] the Giant Metrewave Radio Telescope (GMRT) in Narayangaon,Pune, India. It consists of 30 steerable parabolic dish each of diameter 45 metres opertaing at six different frequency bands and where 14 dishes are arranged in a central square and remaining 6 in a three arm Y-shaped array giving a baseline of about 25 Kilometres . [7] Some of the new radio interferometers are: Low Frequency Array (LoFAR) in north of Exloo, the Netherlands (core) and neighbouring countries It is a phased-array of radio telescopes of about 25,000 small antennas in at 48 larger stations where 40 of these stations are distributed across the north of Netherlands, five stations in Germany, and one each in Great Britain, France and Sweden and has a low requency range from 10-240 MHz. [8] Figure 1: The LoFAR Array Atacama Large Millimeter Array (ALMA) in llano de Chajnantar Observatory, Atacama Desert,Chile It consists of sixty six 12 metres and 7 metres diameter radio telescopes observing at wavelengths of 0.3 to 9.6 millimetres . [9] Murchison Widefield Array (MWA) in Murchison Radio Astronomy Observatory, Western Australia It consists of 2048 dual-polarization dipole antennas, each a 44 array of dipoles and operates at low radio frequencies, 80-300 MHz, with a processed bandwidth of 30.72 MHz for both linear polarisations, and consists of 128 aperture arrays (known as tiles) distributed over approximately 3- kilometres diameter area. [10] Figure 2: MWA Antenna tiles KAT7 MeerKAT in Northern Cape, South Africa Figure 3: Aerial View of KAT7 KAT-7 consist of 7 dishes of 12 metres in diameter each a Prime Focus Reflecting Telescopes having a minimum baseline of 26 meters and maximum baseline of 185 metres and have a frequency range of 1200 MHz – 1950 MHz. KAT-7 is an engineering prototype for the MeerKAT. KAT-7 is the world’s first radio telescope array with fiberglass dishes. . MeerKAT, which is still under construction and is slated for completion in 2016 , will consist of 64 dishes of 13.5 meters in diameter having a minimum baseline of 29 metres and maximum baseline of 20 kilometres and it will operate at frequency ranging from 580MHz – 1.75 GHz and 8 – 15 Ghz.[11,12] e- MERLIN is an enhanced and upgraded array of the old MERLIN array.The e- MERLIN instrument is a high resolution radio interferometer connected by a new optical fibre network to Jodrell Bank Observatory. This new system gives rise to a massive increase in sensitivity and observational capabilities.[13] Figure 4: e-MERLIN array European VLBI Netwok (EVN) is an interferometric array of radio telescopes spread across Europe which also includes stations in far-East Asia , South Africa and Puerto Rico that conducts high resolution radio astronomical observations of radio sources. It is the most sensitive VLBI array in the world. It was formed in 1980 and the administering body now comprises 14 institutes[15].TheEVNalso routinely joins other networks, such as theVery Long Baseline Array (VLBA)and the Multi-Element Radio Linked Interferometer Network (MERLIN), to become a globalVLBIarray. The VLBA is spread throughout Mauna Kea , Hawaii and St Croix. It typically consists of 10 VLA radio antennas and as result it has a maximum baseline exceeding 8000 Km[16]. Some of the future African based new radio interferometers are: African VLBI Network (AVN) Multi-Frequency Interferometry Telescope for Radio Astronomy (MITRA) 1.1.3 MITRA (Multi-frequency Interferometry Telescope for Radio Astronomy) 1.1 The MITRA is an international radio astronomy project which aims to do extremly wide field of imaging with heterogenius non coplanar arrays. The acronym of MITRA means â€Å"friend† in Sanskrit. It is a low frequency array telescope jointly started by Girish Kumar Beeharry from University of Mauritius (UOM) nd Stuart David Macpherson and Gary Peter Janse Van Vuuren from the Durban University of Technolagy (DUT) in South Africa. The project is being simultaneously implemented at the Mauritius Radio Telescope (MRT), located at Bras D’Eau Mauritius, site and at the DUT campus site. The projects will then be expanded to the different SKA Africa partner countries and eventually to other African countries. Data from each country will be combined to form an international aperture synthesis telescope using the techniques of Very Large Baseline Interferometry (VLBI). It is a sensitive high resolution multifrequency dual polarity instrument in the range of 200 to 800 MHz. The instrument chosen for this purpose are Dual Polarized Log Periodic Dipole Antennas (DPLPDA)[17]. 1.1.4 African Long Baseline Interferometry Network (AVN) The African Very Long Baseline Interferometry Network (AVN) is an array of radio telescopes throughout Africa. It is planned to form part of the existing global VLBI networks . It will be associated with the European VLBI Network (EVN ). The latteris a consortium of major radio astronomy institutes in Europe and China (Schilizzi). It has member and associated radio telescopes in Europe, China, South Africa (Hartebeesthoek0, Japan(Kashima) and Puerto Rico (Arecibo). The EVN is capable of providing an excellent angular resolution(from 5 to 0.15 milliarc seconds depending on observing frequency) and high sensitivity for VLBI observations. One of the main technological drivers has been the availability of telecommunication antennas all over Africa. Part of the scheme is to modify the existing dishes, of about at least 30 m in diameter, into radio telescopes. All these telescopes will be linked together, and to radio telescopes in South Africa, forming the African VLBI Network. This, in t urn, would be connected to radio telescopes and arrays in Europe and elsewhere in the world, including North and South America, Asia and Australia. The conversion of a Ghana located dish into a radio telescopes has already been begun.The AVN’s plans to convert three more dishes in Kenya, Zambia and Madagascar. It also aims to build four new radio telescopes in Namibia, Botswana, Mauritius and Mozambique. [19] 1.1.5 Electronic Multi Beam Radio Astronomy ConcEpt(EMBRACE) and African European Radio Astronomy Aperture Array (AERA3 ) The EMBRACE demonstrates the technical and scientific potential of the aperture array concept using a phased array station with the essential SKA. There are two stations, one in NanÃ’Â «ay, France and the other one at the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands. These two stations are prototype arrays for the SKA MFAA. It consists of an antenna array organized in tiles of dual polarization antennas. A large number of antenna tiles forms the collecting area. The signals from the radiating elements of the antenna from each tile are amplified and the initial analogue RF beam forming is applied. Generally, an EMBRACE is designed for a frequency range of 400-1500 MHz of single polarization, a collecting area of 100 m2 , system temperature of 100 K and has two fields of view with 8 digital beams . The idea of having multiple independent beams gives rise to the AERA3 because EMBRACE considers only two beams. AERA3 is similar to EMBRACE but this new aperture array will have a greater collecting area with will be approximately 2000 m2 varying with a frequency range of 400-1500 MHz with full polarization, two fields of view with 64 digital beams, system temperature of 50 K and bandwidth of less than 500 MHz. AERA3 will be used for intensity mapping, surveys of the whole sky and search for pulsars.[20,21] Figure 5: Embrace at Nancay, Paris 1.1.6 The Square Kilometre array (SKA) The SKA will be a revolutionary radio telescope made of hundred of thousands of receptors. They will be linked together, forming a total collecting area of approximately one square kilometre. It will be the largest and most sensitive radio telescope ever built. It will be able to survey the sky faster than present instruments. In 2006, the African consortium and Australia were both shortlisted as potential sites fot building the SKA. In the 25th May 2012, the SKA organisation announced that SKA would be shared between the African consortium and Australia on a 2:1 ratio basis. The African consortium would be undertaking the construction of the high and mid frequency arrays. The Australian would be in charge of the low frequency aperture array. The SKA consists of two phases where Phase 1 is the construction of about 10% of the SKA. It will make use of the existing infrastructure and telescopes already being built by the two countries. That is, the South Africas precursor array the 64-dish MeerKAT telescope and the Australias 36-dish SKA Pathfinder (ASKAP). Additionally, there will be 50low-frequency 1.5 metre high antenna stations, 60mid-frequency 15 metre dishes built in Australia. Finally, 190mid-frequency 15 metres dishes will be built in South Africa. Phase 2 is the extension to a baseline of 3,000 Km or more in South Arica and African partners countries. These are namely, Botswana, Ghana, Kenya, Madagascar, Mauritius, Mozambique, Namibia, and Zambia. Also, a total of about three thousand dishes, with the highest concentration in the Northern Cape, South Africa, and some dishes in the other consortium countries will be built. In Australia, the telescope will extend over a baseline of200 km. It will operate with a frequency coverage from 70 MHz to 30 GHz. The SKA will use aperture synthesis, over a distance of more than 3000km to simulate a single giant radio telescope capable of extremely high sensitivity and angular resolution. The SKA will be able to observe the black holes, stars, galaxies and detect black holes[11,22,23,24]. Figure 6: SKA overview 1.1.7 The Log Periodic Dipole Antenna A log periodic antenna, also referred to as a log periodic array, is an antenna that can operate on a wide frequency band. It was à ¯Ã‚ ¬Ã‚ rst built in 1958 by Dwight Isbell at the University of Illinois, United States of America. LPDA is a directional antenna which possesses constant electrical characteristics such as gain, impedance and front-to-back ratio over the wide range of frequencies. It varies periodically with the logarithmic. The antenna consists of a series of linear elements also known as dipoles and the individual elements connect with a transmission or feed line such as coaxial cable. Each element is placed in an alternating configuration leading to a phase shift of 180o (Ï€ radians). [25] 1.2 Aim The aim of this project is to construct a front-end system for radio astronomical observations in the frequency range 200 MHz to 800 MHz using the Dual Polarised Log Periodic Dipole Antenna model with bandwidth 200 MHz to 800 MHz. The front end system will consist of an L-shaped array of antennas. This L shaped array is the start of a matrix of an eight by eight antennas. It will be used as a prototype for Intensity mapping for large scale neutral hydrogen (HI) mapping. Several improvements to the existing antennas will be made and applied to new array configuration. Also along with the array, a shielded box will be constructed for electronic purposes. This work focuses on the longer baseline sparse mid frequency aperture array (MFAA), in contrast to the dense aperture arrays like EMBRACE and the future AERA3.

Analyzing and comparing similarities and differences of different articles

The intent of this study is to see and analyse similarities and differences between the four scientific articles with mention to S rensen s article This is non an Article. For this study we have chosen the subject in the country of computing machine scientific discipline. General Footings Documentation Keywords Article, analysis, Information System development ( ISD ) , research coverage, package development pattern, Emotional Learning ( EL ) , Cognitive Tutor System ( CTS ) , Face, Facial Recognition, Object Detection, Face Recognition, Face Processing, Face Recognition Algorithms, Face Detection, package testing, package development procedure 1. Introduction This study contains the consequence of analysing and comparing similarities and differences of four chosen articles in footings of abstracts, debut, method, consequence, treatment and decision harmonizing to the S rensen s article [ 1 ] . Based on S rensen s article analysis of above elements in articles has to be able to reply following inquiries: * What is the job sphere? * What is the job? * What is the research attack? * What have others done? * What are consequences? The four scientific articles that we have opted are: Article1: The NIPO GRID A Construct for systems development patterns in organisation [ 2 ] . Article2: Execution of Emotional Learning for Cognitive Tutoring Agents [ 3 ] . Article3: Best Practices for the Organizational Implementation of Software Testing [ 4 ] . Article4: Face acknowledgment for smart environment [ 5 ] . In the undermentioned subdivisions differences and similarities of the above scientific articles are summarized harmonizing to the indispensable inquiries. 1.1 Abstractions, Contexts In general, abstracts summarize the article contents of intent, method, consequences and decision [ 1 ] . In the first article [ 2 ] , the research is written in the context of package development patterns and is shaped on the footing of the inquiry how and why existent patterns are shaped in professional system and package development organisations. The abstract provides concise, clear and interesting overview of what the reader will derive by reading the article. Plus, Along with following abstract constituents [ 6 ] , authors avoided utilizing mentions, slangs and acronyms in the abstract. In the 2nd article [ 2 ] the short abstract contains a mention at the terminal of abstract and an acronym along with complete description has been mentioned. The Context is in larning mechanism and proposed mechanism for bettering Cognitive Tutoring System ( CTS ) utilizing Emotional Learning ( EL ) . The abstract determined the end of the article, which is about increasing agent s liberty in a mutable environment. The 3rd article s [ 4 ] abstract, summarized the consequence of a undertaking with regional companies in package proving. The article describes four chief recommendations sing the organisational execution and strategic accommodation of proving. It introduces a model to sort recommendations for proving. In the 4th article [ 5 ] , the writers discuss about face acknowledgment engineering in smart environment as aid, for assisting worlds to be successful in absorbing broad consumer blessing On the whole, abstract in the first article [ 2 ] provides concise, clear and interesting overview of what the reader will derive by reading the article while in the 2nd article [ 3 ] authors used a mention and an acronym at the terminal of the abstract, besides the point the job is non straight mentioned. In the 3rd article [ 4 ] abstract introduces the research filed and besides identifies the chief job with the filed. It besides avoids utilizing mention and acronym. In the 4th article [ 5 ] , abstract was non mentioned as a separate caption, nevertheless the first paragraph has the same features of abstract and gives the reader a complete and speedy designation of the basic content of the article. 1.2 Problem Domains and Motivations Showing the job sphere helps concentrating the attending of the reader and frames the research job [ 1 ] . The first article [ 2 ] nowadayss intermediate consequences from a survey of issues, which influence defining of information systems development ( ISD ) patterns in systems and package development organisations. It describes a concept for analyzing the behaviour of organisations in utilizing Software Development Method patterns in the procedure of merchandise development. While the paper is portion of an on-going undertaking of a company it surveies the mentioned behaviour from two dimensions, the attitude and executing as regulations. The study itself uses footings â€Å" intended patterns † vs. â€Å" enacted patterns † . The 2nd article [ 3 ] is a research-base paper ; it searches within larning mechanisms country with concentrating on emotional acquisition and defines another related attack that improves the bing CTS. The chief intent of this scientific article is to fit the CTS by an emotional acquisition mechanism to work in mutable environment like human being. The job sphere of the 3rd article [ 4 ] is how to better package quality.it analysis the package proving as a portion of the package development procedure of the companies to pull out their jobs in package development and to utilize their best patterns in package testing. The 4th article [ 5 ] argues about what Technology is the best for people designation and discuss about face acknowledgment engineering, how it works, the jobs, current engineerings and future development. 1.3 Research Questions One of the chief factors should be considered in measuring papers, is how the research inquiries have been shaped and in the undermentioned how suited the methodological analysis is selected and whether the selected research method has led to happening the reply to the research inquiries or non. In the first article [ 2 ] there are two inquiries raised and all answered based on the observations from the existent companies: * How and why existent ISD patterns are shaped in professional systems and package development organisations? * Why definitions and existent passage of peculiar types of development patterns vary among development organisations? In the 2nd article [ 3 ] the job that the writers are turn toing is that in the bing CTS, sum of clip for responding to a stimulation was much big and it causes emotions is disregarded and won Ts travel through the other scholar types. Hence the agent won t be able to be compatible with the environment. That means in current CTS the emotional propensity is non implemented. The cardinal scientific inquiries that the writer is turn toing are: * How to implement an emotional acquisition mechanism in CTS in a better manner? * Is at that place any manner to increase the liberty of a cognitive coach agent in order to do it similar to human being? In the 3rd article [ 4 ] the research inquiry addressed by writers is: * How to accomplish better package quality through proving? The reply is illustrated by suggesting 4 chief actions to better proving procedure: * A simple first thought * Requirements technology * Implementation of a trial centre * Test controlling and public presentation measuring In the 4th article [ 5 ] the chief inquiry is: * What engineering is the best for people s individualities? It s mentioned on the article that the common engineerings that are used are vulnerable to forgery and larceny and oversights in user s memory therefore face acknowledgment as one of the biometric engineerings that have a natural topographic point in smart environment identify people by their physiological features, and in recent old ages the attending of the scientific community has been focused on face acknowledgment. 1.4 Research Approaches and Methods In this portion, we will discourse about the methods and research attacks used in each of four articles to reply their research inquiries. Since the first article [ 2 ] is considered as an inductive research and uses a grounded theory attack [ 7 ] , the paper does non include any hypothesis ; alternatively it starts based on the conceptual theory and attempts to reply why the definitions of the development patterns and ordaining them vary among organisations ; and continues on the footing of observations and instance surveies. Input informations really is collected from the observations from eight companies. The research methodological analysis used to happen the replies of the research inquiry is grounded theory, which best suits because the writers have theoretically answered the inquiries foremost and so tried to verify it. For this instance the suited methodological analysis is grounded theory. In the 2nd article [ 3 ] the end is to better the bing system, apprehension of the emotional acquisition and its effects on different parts of CTS. Therefore the research methodological analysis is Qualitative. The method were used in this article is Experiment because it aims to develop the bing system by utilizing hypotheses which is the two-route emotional acquisition theoretical account to better the CTS. Since the article is an probe through the other literatures the research approaches is Empirical. In the 3rd article [ 4 ] the research attack is Empirical and the research method is Action research because it has focused on work outing jobs and seeks to take technology-oriented every bit good as organizational-focused. Qualitative research methods were used. Qualitative research method focal point on increasing apprehension of a substantial country ; it involves methods such as instance surveies. In this research interviews can be seen as a instance survey. In the 4th article [ 5 ] the research attack is Empirical because research is conducted to reply specific inquiry. The research methodological analysis of this article is Qualitative, it concerned with increasing the apprehension of how face acknowledgment engineering works. The research method is Action research. The article provides general inquiries and so the writers theoretically answer those inquiries by garnering all the informations and widen experience ( add strength ) to what is already known through the old researches. Actually the writers tried to better the manner they address issues and work out jobs. The comparings of research attacks, methods and methodological analysiss of the four articles summarized in table 1 in followers: Table 1: comparings of research attacks, methods and methodological analysiss of the four articles Article ( s ) From really early on ISD research has focused on how development should be done ( e.g. Dijkstra 1965, Parnas 1972 ) . This resulted in the building of legion formal systems development methods ( SDMs ) ( Jayaratna 1994, Avison & A ; Fitzgerald 2002 ) . Attachment to methods was regarded by default as utile and methods therefore were to be purely pre-defined and applied as intended by the method developers ( Humphrey & A ; Snyder & A ; Willis 1991, Jarke & A ; Pohl & A ; Rolland & A ; Schmitt 1994 ) . Quite the contrary, a figure of ISD research workers have discussed that SDMs see a great extent of matter-of-fact version during their acceptance and usage, if used at all ( Stolterman 1992, Fitzgerald 1998, Kautz 2004, Vogelsang & A ; Kensing 2006, P iv rinta & A ; Sein & A ; Peltola 2008 ) . One watercourse of research even suggested that amethodical ISD exemplifies an alternate position on development pattern in contemporary ISD organisations. That is, methods would hold no prescribe d function at all, while ISD pattern emerges through contextual interaction and improvisation ( Truex & A ; Baskerville & A ; Travis 2000 ) [ 2 ] . A few Empirical surveies have focused on the impression of single systems developers and how they recognize the relevancy of methods and use them in their work. These include plants on the relationship between developer experience and manners of SDM usage, or determiners of developer purposes to utilize methods ( Hardgrave & A ; Davis & A ; Riemenschneider 2003 ) . Education of brooding systems developers with respect to SDMs has besides received attending ( Mathiassen & A ; Purao 2002 ) . A few surveies have discussed ISD undertaking exigencies in relation to local method acceptance, where the unit of analysis has been a undertaking ( e.g. Kautz 2004, Madsen & A ; Kautz & A ; Vidgen 2006 ) . A good watercourse of research has discussed methods in the context of systems development companies and organisations beyond persons and peculiar undertakings. For illustration, Fitzgerald et Al. ( 2003, 2006 ) focused on internal package development in big IT industry organisations. Mathiassen & A ; Vogelsang ( 2005 ) and P iv rinta et Al. ( 2008 ) have followed longitudinally how peculiar development methods have been adopted and adapted in professional development organisations. Beyond the treatment about methods, the brooding systems development ( Mathiassen 1998 ) , a.k.a. the professional work pattern ( Iivari & A ; Lyytinen 1998 ) , attack has focused on bettering existent development patterns in development organisations. It has focused particularly on action research and local betterments based on contextual fortunes ( Mathiassen 1998 ) . In the 1980s ( Mathiassen 1998 ) , it was one of the first research plans which challenged the belief that development methods as such wo uld better the effectivity of ISD ( Iivari & A ; Lyytinen 1998 ) . We shared this focal point by inquiring how and why existent patterns are shaped in professional systems and package development organisations. In the early phase, we met the challenge to gestate the forms of defined and enacted ISD patterns in our instance organisations. Few consolidative models for this purpose exist. For illustration, Fitzgerald, Russo and Stolterman ( 2002 ) presented the method-in- action model, which explain the influence of a figure of factors on modern-day ISD patterns. It has been used in a figure of plants, e.g. by Madsen et Al. ( 2006 ) to depict how a local method emerged in an single systems development undertaking. Unlike such plants as Kautz ( 2004 ) and Madsen et Al. ( 2006 ) which focused merely on single systems development undertakings, we have an drawn-out position that includes the degree of systems development organisations, which, of class, may take portion in legion undertakings. Software procedure betterment models such as CMM ( Humphrey 1989 ) construct on more elaborate theoretical accounts of the development procedure at the degree of the organisation. However, their intended usage is to measure organisational capablenesss by benchmarking the existent ISD pattern to a predefined set of cardinal patterns, which leaves the pattern outside the cardinal patterns unexplored. In the 2nd article [ 3 ] the writers explain about emotional acquisition theoretical accounts and its effects on different acquisition. There are other CTS theoretical accounts implemented by others such as Gratch and Marsella ( 2004 ) , Franklin every bit good as Vela? squez ( Vela? squez, 1996 ) , proposed their emotional Architectures. But these theoretical accounts have some mistakes. In the old theoretical accounts emotions rise and autumn rapidly and they do non back up propagating information and tracking the state of affairs in existent clip like the system exits in human being. The 3rd Article [ 4 ] explains that there is no set of best trial patterns, which is implemented by any company. Some of the recommendations can be found in academic literature. Other patterns found in this article are non illustrated for the field of package development. In the 4th article [ 5 ] , the writers mention that topic of face acknowledgment is every bit old as computing machine vision because of the subject s practical importance and theoretical involvement from cognitive scientists. Despite the fact that other identi? cation methods ( such as? ngerprints or iris scans ) can be more accurate, face acknowledgment has ever been a major research focal point because it is noninvasive and seems natural and intuitive to utilize. 1.6 Consequences In first article [ 2 ] the study has a treatment portion and the decision portion. The former contains the observations, which are made from the information with the aid of NIPO grid. It describes how the range of existent use of ISD may differ in different degrees of one organisation and across organisations. In this subdivision it is besides claimed that NIPO model has some advantages over CMM and other SPI methods. In latter ( decision ) they have mentioned that the concept that they extracted is something that integrates old SPI approaches into a common model. Although it is mentioned in abstract that the concept would move as dependent variable for organizing the theory it seems that it is non clearly explains how this dependent variable is connected to other variables, while it besides seems that the whole text negotiations about this issue it seems that it would be better to hold a elucidation of that in decision or treatment parts. In the 2nd article, the writers conclude that by implementing EL the agent will larn and respond fast for different sorts of stimulations, which can be used for other acquisition, and assist agent to handle better in a state of affairss whit the being of different and mutable stimulation. For the 3rd article decision is that this article presented consequences from a undertaking with regional companies. They built a model to sort recommendations on how to accomplish better quality through proving. They proposed 4 chief actions to better the testing procedure. In the 4th article [ 5 ] face acknowledgment engineering could play a major portion in assisting worlds as helpful helpers. But to accomplish this end next-generation face acknowledgment system should suit of course within the forms of normal human interactions. so future smart environment should utilize the same theoretical accounts as worlds and have the same restrictions. 1.7 Decision In general, we think that the writers of the article [ 2 ] [ 3 ] [ 4 ] [ 5 ] and have walked about wholly in the model of a research study. The construction of the studies follows recommendations. Especial thing about the first article [ 1 ] is that it points to the defects of the research in treatment session and further it refers to them as future plants in decision subdivision. Besides article [ 4 ] [ 5 ] had some avenues for future research while in the 2nd article there is no hit to that consequence. 2. Recognitions We would wish to thank Bo Helgeson, giving us thought sing how to compose article and other resource information. We are besides grateful to Ted Gunnarson and Eva Norling for learning us how to place the key words, and how to seek scientific text.

Facebook IPO Analysis Essay - 2041 Words

Facebook, Inc: The Initial Public Offering 1. How does Facebook make money? What are the value drivers of its business? What is its comparative advantage relative to other social networking companies? (1) Facebook makes money from the following three main fields First is the advertising. According to the case, we know that the major revenue of Facebook is advertising, which took up 98 percent in 2009, 95 percent in 2010 and 85 percent in 2011. Facebook uses all information uploaded by users to become the property of the firm. By analyzing database, Facebook provides advertisers target customized services and products based on users’ preferences and connections. In its view, the advertising which based on social†¦show more content†¦Second, by going public, Facebook can raise funds from a broader base of investors. With much money, the company can have enough resources to develop new products and invest in their business, which make the company become more competitive. Meanwhile, it’s a good opportunity for the shareholders to gain the best possible value for their own stakes in a long term. Third, for the further development, Facebook raises its reputation and amplifies its brand value. More people get to know the company and join in the Facebook. That is to say, Facebook attracts more users and expands the market share. (2) According to the case, proceeds from the offering will be used for working capital and other general corporate purposes. Facebook didn’t say more about the use of proceeds in details. 3. What was transpiring in the US IPO market prior to Facebook’s offering? What has been the performance of recent IPO’s (during the lead-up to the Facebook offering)? (1) According to the case, global IPO activity during the first quarter of 2012 fell to $14.3 billion, which was dramatically down from $46.6 billion during the first quarter of 2011. 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Persuasive Speech Why You Should Oppose Same-Sex Marriage...

Persuasive Speech: Same sex marriages General Purpose: To persuade Specific Purpose Statement: To persuade the audience to agree that same-sex marriages should not be legal Central Idea: The audience will realize the vices and social disorders created by legalization of same sex marriages in order to preserve marital norms INTRODUCTION I. Same sex marriage is a trending topic if not a trendy one. Countries throughout the globe are pressured with the question of homosexuality being an issue of right or morality. Countries such as Brazil, Canada, some states of the United States and the United Kingdom have legalized same sex marriages while others are still battling with homosexual pressure. II. Today, I would like to†¦show more content†¦An association in matrimony with the evasion of the purpose of sexual act is in direct violation of natural law and morality. According to the letter of Paul to the Romans, natural law is inscribed in every heart (Rom. 2:14-15). C. Same sex marriages defeat the main reason of Benefiting Marriage; a marriage is bestowed numerous benefits for it provides conducive atmosphere for an affectionate, stable, loving and moral environment for proper nurturing of children. A same marriage is not based on such values as its primary objective is gratification of individuals involved in a sterile union. Same sex marriage does not produce children the natural way. This is because the union is basically sterile. The only way they can get children is by following expensive and artificial procedure such as artificial insemination and use of surrogates. The same sex marriage cannot therefore be called a marriage with its natural intention of creating a family. D. Same sex marriage is a sin against God. Marriage was established by God in paradise for the association of Adman ad Eve. In the book of genesis1:28-29 â€Å"God created man in His image; in the Divine image he created him; male and female He created them. God blessed them, saying: ‘Be fertile and multiply; fill the earth and subdue it’†. God punished Sodom and Gomorrah because of engaging in homosexuality (Gen. 19:24-25). Transition: Now that we have seen why same sex marriages should not beShow MoreRelatedCh 1 Need for Ethics8650 Words   |  35 PagesThinking Critically About Ethical Issues, Seventh Edition By: Ruggiero  © The McGraw−Hill Companies, 2008 I THE CONTEXT CHAPTER ONE THE NEED FOR ETHICS Why do we need ethics? We have laws to protect people’s rights. If the laws are enforced, what need have we of further rules? Ethics is the study of the choices people make regarding right and wrong. Each of us makes dozens of moral choices daily. Will we go to work or call in sick? Follow the research protocol or violate it? Put quotes aroundRead MoreLogical Reasoning189930 Words   |  760 PagesAttributionNonCommercial-NoDerivs 3.0 Unported License. That is, you are free to share, copy, distribute, store, and transmit all or any part of the work under the following conditions: (1) Attribution You must attribute the work in the manner specified by the author, namely by citing his name, the book title, and the relevant page numbers (but not in any way that suggests that the book Logical Reasoning or its author endorse you or your use of the work). (2) Noncommercial You may not use this work for commercial purposesRead MoreDeveloping Management Skills404131 Words   |  1617 Pagesmymanagementlab is an online assessment and preparation solution for courses in Principles of Management, Human Resources, Strategy, and Organizational Behavior that helps you actively study and prepare material for class. Chapter-by-chapter activities, including built-in pretests and posttests, focus on what you need to learn and to review in order to succeed. Visit www.mymanagementlab.com to learn more. DEVELOPING MANAGEMENT SKILLS EIGHTH EDITION David A. Whetten BRIGHAM YOUNG UNIVERSITY Read MoreMarketing Mistakes and Successes175322 Words   |  702 Pageswritten permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, Inc. 222 Rosewood Drive, Danvers, MA 01923, website www.copyright.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley Sons, Inc., 111 River Street, Hoboken, NJ 07030-5774, (201)748-6011, fax (201)748-6008, website http://www.wiley.com/go/permissions. To order books or for customer service please, call 1-800-CALLRead MoreStephen P. Robbins Timothy A. Judge (2011) Organizational Behaviour 15th Edition New Jersey: Prentice Hall393164 Words   |  1573 Pagesis protected by Copyright, and permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. To obtain permission(s) to use material from this work, please submit a written request to Pearson Education, Inc., Permissions Department, One Lake Street, Upper Saddle River, New Jersey 07458, or you may fax your request to 201-236-3290. ManyRead MoreOne Significant Change That Has Occurred in the World Between 1900 and 2005. Explain the Impact This Change Has Made on Our Lives and Why It Is an Important Change.163893 Words   |  656 Pagescompelling case can be made for viewing the decades of the global scramble for colonies after 1870 as a predictable culmination of the long nineteenth century, which was ushered in by the industrial and political revolutions of the late 1700s. But at the same time, without serious attention to the processes and misguided policies that led to decades of agrarian and industrial depression from the late 1860s to the 1890s, as well as the social tensions and political rivalries that generated and were inRead MoreRastafarian79520 Words   |  319 Pagespermitted by law, or under terms agreed with the appropriate reprographics rights organization. Enquiries concerning reproduction outside the scope of the above should be sent to the Rights Department, Oxford University Press, at the address above You must not circulate this book in any other binding or cover and you must impose this same condition on any acquirer Library of Congress Cataloging-in-Publication Data Edmonds, Ennis Barrington. Rastafari : from outcasts to culture bearers / Ennis