Дисертації з теми "Characteristic mode theory"
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Chukwuka, Ozuem Anthony. "Performance enhancement of integrated antennas using metamaterials and characteristic mode theory." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1I039.
Повний текст джерелаThe demand for miniaturized mobile wireless systems have increased the need to integrate electrically small antennas which are generally characterized by poor performances and low efficiency. Methods such as the use of dielectric, slots, parasitic components, … have been applied over the years to enhance the performance of such antennas. However they are empirical and based on time-consuming optimisations. Other methods like antenna current optimization based on modal analysis are systematic methods which have been proposed. It has also been shown that the use of artificial materials known as metamaterial inclusions as parasitic element help to improve antenna performance at lower cost. The choice of the right inclusion for an antenna design is complicated especially when the antenna is non-canonical and arbitrary.In this thesis, we propose a systematic method for enhancing the performance of antenna using metamaterial inclusion as a parasitic element. The method is used for designing parasitic metamaterial antenna with the potential to analyse both the radiation and scattering properties of the parasitic metamaterial design. It uses the characteristic modal method to evaluate the quantitative stored energy of metamaterial inclusions which provide quantitative information on the near-field behaviour of the inclusion. The modal stored energy method is compared to the effective parameter method for describing inclusions and they both show good qualitative agreement. In the parasitic metamaterial antenna design process, characteristic mode is applied to get an insight into the radiation properties of the structure and an inclusion is chosen to compensate the stored energy of the antenna element based on the quantity of its modal stored energy. The coupling between the antenna and the inclusion is analysed using the inter-modal coupling co-efficient. It represents the scattering between the antenna and the inclusion and defines how the positioning and separation distance between the two elements affect the overall performance of the metamaterial-inspired system. The proposed methodology is validated with a prototype that show a good agreement between the simulated and measured result. The method is further applied in investigating the enhancement of integrated antenna using electromagnetic cloaking. The cloak couples to the passive element in its vicinity and allow the active antenna element to operate with a better radiation efficiency. The proposed method show usefulness for future design of parasitic metamaterial systems with enhanced performance
Kari, Nadia. "Design methodology and modal analysis of electricallysmall antennas integrated in lossy dielectric media." Electronic Thesis or Diss., Université Gustave Eiffel, 2023. http://www.theses.fr/2023UEFL2024.
Повний текст джерелаThe demand for miniaturized wireless and autonomous communication system has climbed thanks to the wide need of wireless technologies for the monitoring of infrastructures health of our cities, in marine or in the bio-medical field … However, miniaturized antennas are generally characterized by low efficiencies and poor performances and with the presence of lossy media in the vicinity, enhancing its efficiencies becomes not straightforward task. Methods developed to enhance the performance of electrically small antennas ESAs are generally focused on one of the antenna key parameters since there is a compromise trade-off between the size, bandwidth, impedance matching and radiation efficiency. Most of these methods require trial and error and rely on understanding the physical mechanism of the ESA. Moreover, they are limited to canonical structures. On the other hand, there are methods based on the evaluation of the net energy stored in the near field region. By minimizing this stored energy, the quality factor can be enhanced and the radiation mechanism can be improved. These methods are principally based on the use of modal analysis that decompose the surface current response into modes and to extract the eigenvalues and eigenvectors of each mode. It has also been shown that the use of the artificial materials known as metamaterials can play a key role in energy compensation (magnetic coupled to electrical energy and vice versa). It could enhance efficiency, thus mitigating power effects. To date, these methods have been proposed for ESAs radiating in free space.The aim of this thesis is therefore to propose a general method for designing, analyzing andimproving ESAs radiating into lossy media. This work is based on the evaluation of the netstored energy method and the use of the metamaterials for mitigating the effects of losses.Modal methods are also investigated thanks to their useful and powerful metrics for analyzing the electromagnetic response of the structure in the near and far-field regions. The Expansion Eigen Method EEM is used to evaluate the different metrics such as the eigenmodes, eigencurrents and net stored energy to have a full information about the electromagnetic response of the antenna when it is placed in lossy media. The multi-layer substrate model is used to design the surrounding environment and each layer has the dielectric properties that correspond to the host bodies while keeping the 3D radiating structure. The use of the multi-layer substrate model is to avoid the time consuming issue of classical 3D methods. The proposed generic method show usefulness for designing and analyzing of parasitic metamaterials systems to enhance electrically small antennas in complex and lossy media
Cabedo, Fabrés Marta. "Systematic design of antennas using the theory of characteristic modes." Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/1883.
Повний текст джерелаCabedo Fabrés, M. (2007). Systematic design of antennas using the theory of characteristic modes [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/1883
Palancia
Elghannai, Ezdeen Ahmed. "NOVEL METHOD TO CONTROL ANTENNA CURRENTS BASED ON THEORY OF CHARACTERISTIC MODES." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471871173.
Повний текст джерелаWright, Seth. "Competence, Warmth, And Expectations: An Integration Of Status Characteristics Theory And The Stereotype Content Model." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/556454.
Повний текст джерелаStrojny, Brandan Thomas. "EXCITATION AND ANALYSIS OF CHARACTERISTIC MODES ON COMPLEX ANTENNA STRUCTURES." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1301006813.
Повний текст джерелаLiu, Duixian. "Some relationships between characteristic modes and Inagaki modes for use in scattering and radiation problems." Connect to resource, 1986. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1144430762.
Повний текст джерелаObeidat, Khaled Ahmad. "Design Methodology for Wideband Electrically Small Antennas (ESA) Based on the Theory of Characteristic Modes (CM)." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1274730653.
Повний текст джерелаBuhr, Dianne C. "Variability in the estimation of item option characteristic curves for the multiple-category scoring model." Gainesville, FL, 1989. http://www.archive.org/details/variabilityinest00buhr.
Повний текст джерелаRabah, Mhamad Hassanein. "Design methodology of antennas based on metamaterials and the theory of characteristic modes : application to cognitive radio." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10141.
Повний текст джерелаThe rise of wireless communication systems and the big demand of high bit rate links have entailed researches to lie over new communications systems. With this diversity of wireless systems, flexibility for operating between different standards is strongly needed. Cognitive radio (CR) consist the future system that can offer this flexibility. The new features of CRs remains many challenges to their antennas. Miniaturization, isolation and bandwidth improvement, are all real needs and effective challenges. Especially when the geometry of the antenna become more complex in order to fit the terminal chassis. The use of metamaterials (MTM) has been introduced to overcome physics limitations in order to undertake these needs. The analysis of MTM in presence of radiating elements such antennas prove to be a challenge. In this thesis, an new approach to address these challenges is proposed. It is based on a modal concept using the theory of characteristic modes (TCM). It proves to be useful to analyse and design of electrically small antenna (ESA), metamaterial-inspired antennas and metamaterial-based antennas. Furthermore, the same approach is used to evaluate the antenna performances when surrounded by complex artificial materials by proposing closed formulas for the quality factor. This remains into a huge advantage in the antenna shape optimisation in the antenna industry. As a proof of concept, an extremely-wide-band antenna for underlay CR (sensing antenna) is developed using the proposed approach in order to have stable radiation pattern an high efficiency in the electrically small regime. An experimental validation of the performances of all the presented designs is also provided
Perera, Simon. "Grothendieck rings of theories of modules." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/grothendieck-rings-of-theories-of-modules(897cbbd9-77b6-47fb-8cf8-d15c7432e61b).html.
Повний текст джерелаWyszynska, Ewelina, Christer Norbäck, and Henrik Pettersson. "Arbetsmotivation vid komplexa och icke-komplexa arbetsuppgifter." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-35864.
Повний текст джерелаThe purpose of this thesis was to determine whether and how the level of complexity within work task affects what employees are motivated by. Moreover, was the purpose to investigate what preferences the employees with different level of complexity in their work task had regarding non-monetary rewards. The degree to which the executives were aware of their employees preferences regarding non-monetary rewards was also examined. Based on theoretical perspectives should the employees with complex work tasks be motivated by intrinsic factors such as praise, growth and increased autonomy. The employees with non-complex work task should be affected by extrinsic factors such as salary and spontaneous material rewards. The study was carried out on two case companies with a population of 60 employees with non-complex work tasks and 30 employees with complex work tasks with a response rate of 57%. The results of this study confirm that people with complex work tasks experience intrinsic motivation whereas those with non-complex work tasks experience extrinsic motivation. The result concludes that it is the access to a certain kind of motivation rather than the complexity of work task which determines what the employee is motivated by.
Vaarala, Robert, and Johan Svernell. "Personlig motivation i agil projektledning : En fallstudie på Kambi Sports Solutions AB." Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-202750.
Повний текст джерелаBrinster, Irina. "Multi-Objective Algorithms for Coupled Optimization of Mechanical and Electromagnetic Systems." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/528.
Повний текст джерелаBohlin, Jonathan, and Emelie Cheng. "Belöningssystem och generation Y i IT-branschen." Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243198.
Повний текст джерелаSilver, Lorraine P. "Characteristics associated with physical activity among college students : an application of social cognitive theory and the stages of change model /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392910755.
Повний текст джерелаLake, Christopher J. "Respondent and Test Delivery Characteristics that Induce Item Unfolding." Bowling Green State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1284597892.
Повний текст джерелаSun, Qin. "An Analytical Model of the Determinants and Outcomes of Nation Branding." Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc12204/.
Повний текст джерелаYegin, Oya Perim. "The Predictive Validity Of Baskent University Proficiency Exam (buepe) Through The Use Of The Three-parameter Irt Model&." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1013507/index.pdf.
Повний текст джерела#8217
s ability estimates. The study made use of the BUEPE September 2000 data which included the responses of 699 students. The predictive validity was established by using the departmental English courses (DEC) passing grades of a total number of 371 students. As for the prerequisite analysis the best fitted model of IRT was determined by first, checking the assumptions of IRT
second, by analyzing the invariance of ability parameters and item parameters and thirdly, by interpreting the chi-square statistics. After the prerequisite analyses, the best fitted model&
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s estimates were correlated with DEC passing grades to investigate the predictive power of BUEPE on DEC passing grades. The findings indicated that the minimal guessing assumption of the one- and two-parameter models was not met. In addition, the chi-square statistics indicated a better fit to the three-parameter model. Therefore, it was concluded that the best fitted model was the three-parameter model. The findings of the predictive validity analyses revealed that the best predictors for DEC passing grades were the three-parameter model ability estimates. The second best predictor was the ability estimates obtained from sixty high information items. In the third place BUEPE total scores and the total scores obtained from sixty high information items followed with nearly the same correlation coefficients. Among the three sub-tests, the reading sub-test was found to be the best predictor of DEC passing grades.
He, Ling. "The perceived personal characteristics of entrepreneurial leaders." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2014. https://ro.ecu.edu.au/theses/1338.
Повний текст джерелаMukabi, Collins, and Nguyen Long Vu. "Cryptocurrency as a Payment Method in the Retail Industry : An application of Diffusion of Innovation Theory (DOI) on the characteristics of Bitcoin: the case of Bitrefill." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Företagsekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-46892.
Повний текст джерелаLingmarker, Deckeman Evelina, and Zehra Köylüoglu. "Arbetsmotivation utifrån ett ledarskapsperspektiv : En kvalitativ studie om hur ledare verkar för att motivera sina medarbetare till ett högt arbetsengagemang i offentlig sektor." Thesis, Södertörns högskola, Institutionen för samhällsvetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-41255.
Повний текст джерелаThis study aimed to create an understanding of leaders perception of what they believe affects the employees motivation in the public sector based on the questions “what ideas do managers have about what factors affect their employees motivation?” and “how does the leaders think that they can motivate their employees?”. The method on this study is based on a qualitative method with an approach of semi-structured interviews. For the empirical data collection, six interviews were made with people who have or had a leader position in the public sector. The theoretical frame for this study was based on the Self-determination theory, Herzberg's two-factor theory and Hackman & Oldham's job characteristics model. The result showed that it is primarily the internal motivation that managers consider to be motivational. To motivate employees, they focus on stimulating internal motivational factors among employees. Depending on their perceptions of which factors were most motivating, it could vary which motivational tools they focused most on. The most prominent motivational tools that the managers used were affirmation, praise and as well as constant dialogue with their employees.
Young, Anna M. "Variations in Specialized Policing Response Models as a Function of Community Characteristics- A Survey of Crisis Intervention Team Coordinators." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/4012.
Повний текст джерелаEryganov, Ivan. "Aplikace kooperativní teorie her pro Cournotovy oligopoly." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401580.
Повний текст джерелаEden, Rebekah G. "The conceptualization and investigation of user capital and its impact on effective use and information systems success." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/107158/1/Rebekah_Eden_Thesis.pdf.
Повний текст джерелаКостишин, В. С. "Моделювання режимів роботи відцентрових насосів на основі електрогідравлічної аналогії". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2003. http://elar.nung.edu.ua/handle/123456789/3994.
Повний текст джерелаДиссертация посвящена решению важной научно-практической проблемы математического моделирования центробежных насосов со спиральным отводом на основе обобщенной теории цепей и метода электрогидравлической аналогии.
The dissertation is devoted to solving of the important scientific and practical problem of mathematical modeling of centrifugal pumps (CP) of oii pipelines on the basis of the generalized theory of circuits and a method of electrohydraulic analogy. The theoretical bases of modeling of the idealized hydraulic machine have been developed and its theoretical characteristics have been investigated. The created model of the real centrifugal hydraulic machine in real numbers coordinates (scalar model) has been created for determining power balance CP on the basis of calculation of the interconnected hydraulic, volumetric and mechanical losses on a full interval of functioning of the machine. Convenient tor practical use and simplified trigonometric and polynomial analytical expressions of characteristic CP in system of relative units have been synthesized. Their prominent feature is using the rating value of a settlement angle of loading as main design data CP. Its deterermining is conducted through machine catalogue parameters. The model of the real CP in coordinates of complex numbers (complex model) which enables analytical calculation of characteristics of the pump depending on frequency of rotation of a wheel and viscosity of a working liquid has been developed. Ways of using CP models for optimization of modes of pumping over main oil pipelines stations and calculation of economic efficiency of introduction the thyristor variable-speed control electric drive have been determined. The catalogue of settlement regime parameters for modeling series CP for main oil pipelines has been created and the basic results of dissertation work have been introduced.
Celik, Hasan. "Implications of Performance-Based Contracting on Logistics and Supply Chain Management: A Multi-Method Approach." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1707410/.
Повний текст джерелаSzinvelski, Charles Rogério Paveglio. "Uma solução para a equação da energia cinética turbulenta empregando o método das características." Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/3885.
Повний текст джерелаIn this study, using the Method of Characteristics and numeric resources, presents a solution to the equation Spectral Density Evolution of Turbulent Kinetic Energy for a Convective Boundary Layer (CBL) in the morning. It presents three models for the evolution of spectral energy density. The first model, based on the assumption of a system of isotropic turbulence, considering only terms of energy transfer inertial and viscous dissipation. The second model adds the term energy production due to the onset of action of the parameter of heat flux on the surface, but consider it a term of energy transfer inertial anisotropy. The third model employs a mixed configuration of the two previous models, assuming thus distinct regions of operation to inertial transfer terms. The results shaped the evolution of the CLC. In this case, the growth of the energy spectrum is modeled by inserting energy in the region of low wave numbers, a region in which the term of anisotropic energy transfer can not transfer the energy introduced by the energy production term. It is observed that in a region of wave number higher there is a stabilization of the parameter variation temporal on the plane characteristics curves (PCC), indicating that the variation of wave number govern the evolution of the energy spectrum. This fact establishes a kind of criterion for stationarity of turbulent flow regimes.
No presente trabalho, utilizando o Método das Característica e recursos numéricos, apresenta-se uma solução para a Equação de Evolução Espectral de Densidade de Energia Cinética Turbulenta para uma Camada Limite Convectiva (CLC) no período da manhã. Apresenta-se três modelos para a evolução espectral da densidade de energia. O primeiro modelo, baseado na suposição de um regime de turbulência isotrópica, considera apenas termos de transferência de energia inercial e de dissipação viscosa. O segundo modelo adiciona o termo de produção de energia devido o início da ação do parâmetro de fluxo de calor na superfície, porém considerá-se um termo de transferência de energia inercial anisotrópico. O terceiro modelo emprega uma configuração mista dos dois modelos anteriores, admitindo, desta forma, regiões distintas de atuação para os termos de transferência inercial. Os resultados obtidos modelaram a evolução da CLC. Neste caso, o crescimento do espectro de energia modelado se deu pela inserção de energia na região de baixos números de onda, região em que o termo de transferência de energia anisotrópico não consegue transferir a energia inserida pelo termo de produção de energia. Observa-se que em uma região de número de onda mais alto existe uma estabilização da variação do parâmetro temporal sobre as curvas características planas (CCP), indicando que a variação do número de onda governará a evolução do espectro de energia. Fato que estabelece um tipo de critério de estacionariedade para de regimes de escoamento turbulento.
Costa, Kelton Augusto Pontara da. "Uma ferramenta para execução de algoritmos utilizando o modelo a fluxo de dados dinâmico em hardware reconfigurável para a arquitetura ChipCflow: módulo de conversão C em grafo a fluxo de dados." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18152/tde-20082009-153150/.
Повний текст джерелаChipCflow is a tool for algorithms execution using a data dynamic flow in reconfigurable hardware. The main purpose of the work is to use the data flow architecture model, associated to the concept of reconfigurable architectures, to speed up C written applications. The program acceleration happens in the most intensive processing parts (example: loops), through direct hardware execution, using to advantage of the natural parallelism of the data flow model. The C conversion module in data flow graph is the basic part in the development of the ChipCflow project and the specific objective of the developed work. In this work we present detais of the C precompiler that generates VHDL code for the data flow operators modules of the written program of the original application in C. It is possible to consider as the main result of this thesis, the implementation of algorithms from a C language in the data flow graph model proposed in the project ChipCflow, where the operators to the data stream are typically already known, and even the way interconnection too, but how to approach the implementation in VHDL, and as a dynamic data flow, makes the proposed model for both the hardware and the compiler, a feature only available so far.
Mathavakkannan, Suresh. "Techniques to assess volume status and haemodynamic stability in patients on haemodialysis." Thesis, University of Hertfordshire, 2010. http://hdl.handle.net/2299/4811.
Повний текст джерелаNyh, Johan. "From Snow White to Frozen : An evaluation of popular gender representation indicators applied to Disney’s princess films." Thesis, Karlstads universitet, Institutionen för geografi, medier och kommunikation, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36877.
Повний текст джерелаBetyg VG (skala IG-VG)
Akrou, Lamyae. "Numerical aspects of the characteristic modes theory." Doctoral thesis, 2020. http://hdl.handle.net/10316/96359.
Повний текст джерелаNowadays, the characteristic modes theory becomes more and more popular in the electromagnetic field as a very efficient tool for analysing and solving scattering and radiation problems. Unlike the existing analysis tools, the characteristic modes analysis is based on the eigenvalues and the eigenvectors. Actually, these two key factors help enormously in gaining useful physical insights into the scatterer’s modes, the modes contributions to the radiation field, and reveals which mode is dominant for each frequency sample of the frequency band being examined. Normally, the eigenvalues and the eigenvectors are derived directly from the modal decomposition of the impedance matrix of the scatterer using the real and imaginary parts of the matrix. Unfortunately, it is found that the real part of the impedance matrix doesn’t fully fill full the theoretical specifications of the characteristic modes theory, which harms the numerical accuracy of the characteristic modes and reduces tremendously the total number of the obtained modes. Therefore, in order to respond to the theoretical requirements of the characteristic modes theory, a new method is proposed to treat this issue by reconstructing the real part matrix using the expansion of the Green dyadic in spherical vector waves. The new approach proved its efficiency and resulted in higher numerical accuracy, an increased number of the characteristic modes, and improved the computational speed in comparison to the conventional approach. However, after obtaining the accurate characteristic modes, the issue of how to connect the modes with each other is raised. The choice of a suitable method to perform the modes tracking is very critical to the accuracy of the analysis of the characteristic mode. Thus, the modal tracking problem is investigated also, with a main focus on the modes swapping and degenerated modes phenomena encountered in the eigenvectors correlation method. Consequently, an enhanced modal tracking method is proposed based on the difference in magnitudes between successive eigenvalues, as a criterion to establish the associations between the modes along the frequency axis. The tracking method is validated using several numerical applications, and satisfactory results are obtained. At times, to achieve a higher accuracy of the modal tracking, it is mandatory to increase the number of frequency samples resulting in a larger size of the impedance matrix. The computation of the impedance matrix at discrete frequency samples is a very time-consuming process, particularly for wideband frequency applications, therefore, the necessity to apply the impedance matrix interpolation method is highlighted. Finally, relevant concepts used throughout this dissertation are detailed in the appendices section, together with the source codes used to perform the modal decomposition, the modal tracking, and the impedance matrix interpolation.
Moreno, Javier A. "Iterative differential Galois theory in positive characteristic : a model theoretic approach /." 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3314855.
Повний текст джерелаSource: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3034. Adviser: C. Ward Henson. Includes bibliographical references (leaves 43-45) Available on microfilm from Pro Quest Information and Learning.
Shyue-Cheng, Yang, and 楊學成. "Conjugate theory on studying the model and characteristic with screw motion mechanism." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/17117838383548077168.
Повний текст джерела國立成功大學
機械工程學系
87
In terms of principal, conjugate theory is a branch of differential geometry. It is included in differential geometry. But the detail content doesn''t find in the books of differential geometry. Little content maybe included in differential geometry. However, their mathematical forms don''t conveniently apply to conjugate surface''s theory. Conjugate theory mainly applies to solve these questions, such as, machine design, manufacturing, confirmed surface of a tool, straightening roll machine, conjugate surfaces, and so on. In order to solve these questions, the conjugate theory is develop and forms an object of application. Based on the conjugate theory, homogeneous coordinate transformation, differential geometry, and computer animation, a series of mathematical models of screw motion mechanisms, such as straightening machine, gear pump, multi-wave tubes, and rolling balls are derived. Using the derived mathematical models establishes the cutting tool path, and their geometric models. Based on the conjugate theory and the developed mathematical models investigate the contact condition between generating surface and generated surface. Envelope of the two-parameter family of surfaces or envelope of the three-parameter family of curves can straighten bars along the straightening line. Moreover, in the present dissertation, assembly errors of screw gear pumps are studied by conjugate theory. By the way of analysis, an error of center distance doesn''t influence the kinematic error. In order to investigate the properties of the surface profile, in the present dissertation, the famous Gaussian first and second fundamental forms have been studied. Combined with the results of mathematical models, the geometrical properties which include the normal curvature, the principal curvature, the principal direction, the first limit curves, and the second limit curves are investigate. In order to synthesize the conjugate pair with the better lubrication and form a hydrodynamic lubricating conditions, the analysis of curvatures are necessary and fundamental. Moreover, the cutting tool path, undercutting, the generation of singular points, the design process of rolling contour, and their mathematical models are supplied in the present dissertation. These results can be important in designing, manufacturing, and detecting. Although the establishment of these models are based on screw motion mechanism. A little change of the process is necessary in solving the similar and relative problems, therefore, it is worthwhile to apply this utensil widely.
Hembry, Ian Fredrick. "Operational characteristics of mixed-format multistage tests using the 3PL testlet response theory model." Thesis, 2014. http://hdl.handle.net/2152/26033.
Повний текст джерелаtext
Hung, Pei-Chun, and 洪佩君. "The Influence of Product Characteristics on the Consumers' Behaviors for Purchasing Car-The Model of Theory of Planned Behavior." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/90557256501857676181.
Повний текст джерела南台科技大學
行銷與流通管理系
96
Although enterprises have often emphasized the development the new products and services, they have neglected the needs of the consumers. At present time, Taiwanese consumers are focused on product characteristics, their financial resources and trade group opinions in determining their purchases. In this study we examine which product characteristic is considered by the consumer when making the car purchase. Furthermore, the theory of planned behavior is adopted to derive effects of car-buying attitude, subjective norm, and perceived behavior on the final decisions. The subjects in this study consist of 20 year-olds who hold a job. We use convenience sampling to analyze the data. We show that external variables of product characteristics and theory of planned behavior of the endogenous variables (which include attitude and subjective norm) have significant influence the consumers' car purchasing behavior. We also show that the perceived behavioral control and consumer intentions have no significant influence on the purchasing behavior. Furthermore, we determine that that there are differences in perceived behavioral control and subjective norm between respondents with car-buying experience and those without the experience. We hope that this study will be used as a reference by the automobile industry and further the understanding of the consumer behavior.
Μαγεράκης, Ευστάθιος. "Cash holdings and firm characteristics : evidence from UK market." Thesis, 2015. http://hdl.handle.net/10889/8739.
Повний текст джерелаΣτην παρούσα διατριβή εξετάζονται οι προσδιοριστικοί παράγοντες του δείκτη μετρητών σε επιχειρήσεις του Ηνωμένου Βασιλείου μεταξύ των ετών 1980 και 2012. Η διακράτηση μετρητών αποτελεί παγκόσμιο φαινόμενο και λαμβάνει της ανάλογης προσοχής από πληθώρα ερευνητών. Σε αυτή τη βάση, η μελέτη αυτή έχει ως στόχο να ρίξει φως σχετικά με την εμπειρική σχέση μεταξύ του δείκτη μετρητών και τα συγκεκριμένα χαρακτηριστικά που επηρεάζουν την ρευστότητα στις επιχειρήσεις διαχρονικά. Αρχικά η έρευνα ενσωματώνει μια βιβλιογραφική ανασκόπηση. Προς το σκοπό αυτό, οι σχετικές οικονομικές θεωρίες και οι προηγούμενες εμπειρικές μελέτες παρουσιάζονται. Στη συνέχεια, τα αναμενόμενα αποτελέσματα της έρευνας συντίθενται σε ένα σύνολο διακριτών υποθέσεων και δοκιμάζονται με ανάλυση παλινδρόμησης. Τα εμπειρικά ευρήματα υποδηλώνουν ότι ο δείκτης μετρητών σχετίζεται θετικά με τις επενδυτικές ευκαιρίες, τις δαπάνες Ε&Α και τον λόγο της αγοραίας προς τη λογιστική αξία των βιβλίων της επιχείρησης. Ο δείκτης μετρητών επίσης, σχετίζεται θετικά με την μεταβλητότητα των ταμειακών ροών του κλάδου και επηρεάζεται αρνητικά από τις ταμειακές ροές, το καθαρό κεφάλαιο κίνησης, τις κεφαλαιακές δαπάνες, την μόχλευση, τα φορολογικά έξοδα, την ηλικία και το μέγεθος των επιχειρήσεων. Όσον αφορά την εξέλιξη των προσδιοριστικών παραγόντων των ταμειακών ρευστών διαθεσίμων, η μελέτη δείχνει ότι τρεις είναι οι κύριες μεταβλητές που επηρεάζουν τη διακράτηση μετρητών κατά τη διάρκεια των χρόνων της ανάλυσης. Ειδικότερα, η μόχλευση, το φορολογικό καθεστώς και τις κεφαλαιακές δαπάνες επηρεάΖουν σημαντικά την απόφαση για εταιρική ρευστότητα στην αγορά του Ηνωμένου Βασιλείου. Επιπλέον, τα αποτελέσματα δείχνουν ότι η διακράτηση μετρητών ακολουθεί κυρίως την trade off θεωρία. Πράγματι, τα ευρήματά προσφέρουν χρήσιμες γνώσεις σχετικά με τους παράγοντες που καθορίζουν τη διακράτηση μετρητών των επιχειρήσεων κατά τη διάρκεια των τριών τελευταίων δεκαετιών. Τα ευρήματα αυτά μπορεί να είναι επωφελή για οικονομολόγους, επενδυτές και συμβούλους.
LIU, CHIA-HUI, and 劉佳惠. "The End of Jobs? The Typology and Development of Portfolio Worker's Job Characteristics Model under the Gig Economy-Application of Grounded Theory." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/spezkx.
Повний текст джерела長榮大學
高階管理碩士在職專班(EMBA)
106
The rise of gig economy has impacted the original job market very much. Monotone employment pattern is no longer satisfying the supply and demand in the employment market, while the psychological contract between organization and employees changed either. Does the gig economy finally make employment come to an end? This research conduct literature review on the gig economy and portfolio workers based on Grounded theory, and develop the typology of job characteristic model for portfolio workers based on JCM (Job Characteristic Model) by conducting in-depth interview, content analysis and scenario analysis, to categorize six types of portfolio workers: casual earners, financially strapped workers, missionaries, prospectors, stability workers and entrepreneurs as reference for future empirical researches.
Abd, Karim Zulakbal Bin. "Development characteristics of football coaches in Australia and Malaysia." Thesis, 2016. https://vuir.vu.edu.au/32214/.
Повний текст джерелаKibret, Behailu Mulatu. "The Human Body Antenna: Characteristics and its Application." Thesis, 2016. https://vuir.vu.edu.au/31012/.
Повний текст джерелаTai, Tzu-fang, and 戴孜芳. "The Relationship between the Characteristics of Core Resources and Entry Modes as Seen from the Resource-based Theory--the Electronic Tube and Semiconductor Firms of Taiwan as an Example." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/01839903397985532991.
Повний текст джерела大同工學院
事業經營學系
85
THE RELATIONSHIP BETWEEN THE CHARACTERISTICS OF CORE RESOURCES AND ENTRY MODES AS SEEN FROM THE RESOURCE-BASED THEORY─THE ELECTRONIC TUBE AND SEMICODUTOR FIRMS OF TAIWAN AS AN EXAMPLEAdvisor: Prof. Hsien-che LeeStudent: Tzu-fang TaiTATUNG INSTITUTE OF TECHNOLOGYGRADUATE SCHOOL OF MANAGEMENTMASTER THESISJUNE 1997 ABSTRACT During the past decade, following the trend of internationalization, firms in the private sector in Taiwan have adopted more entry modes, instead of only focusing on export orientation. Many authors have discussed the topic on Taiwanese R.O.C. firms'''' entry modes from different angels. During the recent years, although RBV has emerged, there are a few empirical researches discussing the entry mode from this perspective. As a result, this study would like to discuss why or how the firms on Taiwan can choose some types of entry modes. This study focuses on the electronic tube and semiconductor firms in the high-tech industries, with special emphasis on IC. This study applies the Standard Classification of Industries of R.O.C. and chooses 3171 code, which includes magnetron, plasma, electronic tubes, image tubes, vacuum tubes, CRT, LCD, diode, thyristors, transistors, wafers, IC, photo conductors, solar cells, and light emitting diode as the target population. The subject of this study is limited to firms with international operations in the last years. This study uses One-way MANOVA to verify whether not all means of core resources are equivalent in characteristics of core resources, uses factor analysis to summarize and reduce the dimensions of characteristics of core resources, uses cluster and discriminant analysis to group samples, and uses Chi-square independent tests to observe whether a firm''''s entry mode will be contingent on its core resource, whether a firm''''s entry mode will be contingent on the characteristics of its core resource, and as for capabilities, whether a firm''''s entry mode will be contingent on the characteristics of its core resource. The following observations are based on this study: 1. Capabilities are more important than assets. The relative importance of the core resource of the individual firm is ''''doing,'''' ''''intangible,'''' and ''''people dependent.'''' R.O.C. high tech firms rely on manufacturing capabilities and innovation and R&D capability. 2. There is an overall significant difference in core resources for characteristics of core resources. This significant difference results from nontradeable nature between tangible assets and intangible assets and between tangible assets and capabilities. between tangible assets and 3. Entry modes of the firms are independent of their core resources and of the characteristic patterns of these resources. Hence, the related hypotheses in this study are not supported. The reasons of the results are that high tech firms need high skill workers and their capabilities and the industrial clusters are highly tacit and highly imperfect transferable. Consequently, the firm opts for export modes. Besides, in its present development, Taiwan''''s semiconductor industry still remains at the growth stage and has not entered the maturing stage; therefore, most of the firms focus mainly on export modes.
Ranganathan, Shilpa. "The Effects of the Political-Legal Environment and Corporate Characteristics on Mergers and Acquisitions in India, 1991-2005." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10787.
Повний текст джерелаSoares, Catarina de Oliveira. "Renting clothes online in Portugal : influence of consumer characteristics and service delivery on attitude." Master's thesis, 2021. http://hdl.handle.net/10400.14/34679.
Повний текст джерелаNos últimos anos surgiram novos modelos de consumo e, simultaneamente, os consumidores tornaram-se mais conscientes do seu impacto no meio ambiente. Isto levou ao aparecimento de uma nova mentalidade e cultura, na qual os consumidores preferem pagar para usar e experimentar diferentes bens e serviços em vez de adquiri-los, designado de consumo baseado no acesso. Impulsionado pelo sucesso deste modelo de negócio a nível internacional e pela sua inexistência no mercado português, este estudo teve como objetivo identificar o efeito de determinadas características do consumidor e do serviço na atitude e na intenção dos consumidores em participarem neste novo modelo de consumo. O propósito desta tese foi testar empiricamente o efeito da liderança na moda, necessidade de exclusividade, importância da propriedade e consciência ambiental, assim como a importância da velocidade de entrega e o receio da falta de limpeza das roupas na atitude em relação a alugar roupa online com base numa subscrição mensal. Para além disso, o efeito da atitude, norma subjetiva e controlo comportamental percebido na intenção foi também estudado. Este estudo baseou-se na Teoria do Comportamento Planeado. Os resultados deste estudo indicaram que a liderança na moda, a consciência ambiental, a importância da propriedade e a importância da velocidade de entrega influenciaram a atitude do consumidor. Ainda, a atitude e a norma subjetiva demonstraram afetar a intenção em relação ao aluguer de roupa. Esta tese visa comunicar às empresas quais as dimensões que devem considerar para atrair certos segmentos, e ainda otimizar as suas campanhas de marketing.
Ribeiro, Marta Holroyd Kendall Cruz. "Startups vs. empresas estabelecidas : a autonomia e o excesso de trabalho na motivação dos trabalhadores." Master's thesis, 2020. http://hdl.handle.net/10400.14/32877.
Повний текст джерелаThe present study seeks to explore the relationship between employees’ intrinsic motivation and their perception of autonomy and work overload, as well as the moderating effect of different work contexts (i.e., startups and established companies), in this relationship. Autonomy and work overload influence employees’ motivation, therefore it is relevant to assess these job characteristics, particularly in startups where employees’ perceptions have not been thoroughly studied in published literature. Data was collected through an online questionnaire, obtaining a sample of 601 respondents – 353 working in startups and 248 in established companies. As expected, the results demonstrate that autonomy positively predicts intrinsic motivation, while work overload negatively predicts it. Although it was not possible to infer that startups increase the positive relationship between autonomy and intrinsic motivation, it was possible to conclude that startups reduce the negative relationship between work overload and intrinsic motivation. The limitations of this study and its implications for future investigations were also discussed.
(14011126), Gayle B. S. Fox. "Modelling District Court decision-making: Offender identity, judicial attitudes and legal factors." Thesis, 2005. https://figshare.com/articles/thesis/Modelling_District_Court_decision-making_Offender_identity_judicial_attitudes_and_legal_factors/21398823.
Повний текст джерелаThe guiding orientation of the present research was whether two conflicting positions, (1) that sentencing in a criminal case is a complex decision-making process, and (2) that sentencing is a judgment based upon few offence and/or offender details, could be reconciled. The competing claims lend support to the opposing viewpoints on sentencing guidelines, and are explicitly or implicitly utilised by each side in the law and order' debate, but each is deficient in current empirical or theoretical investigation. Archival research was undertaken on assault occasioning bodily harm cases from the Queensland District Court. Study 1 (N = 244) investigated the correlations between 27 offence, offender, victim and sentencer characteristics (e.g., use of a weapon in the assault, offender's prior convictions, victim's gender and sentencer's expertise), five theorised preliminary decisions (e.g., whether to impose a tariff versus individualised penalty, to set a utilitarian versus retributive punishment), and five sentencing decisions (e.g., to record or not record a conviction, to impose a lenient or a harsh penalty). Results favoured the conclusion that sentencing is a complex decision-making process. Numerous correlations between the variables were initially indicated, although the effects on the sentencing decisions decreased when the offence seriousness and the offender's prior criminal history were controlled for. Guided by the results from Study 1, five increasingly complex legal and theoretical models were developed. The models were arranged hierarchically, initially including only legal variables and then expanded to incorporate concepts from Schubert's (1965;1974) Attitudinal Model of Supreme Court decision-making, and from Heise's (1988) Affect Control Theory. These were evaluated in Study 2 (N=393) using structural equation modelling. Model comparisons revealed that while the Simple Legal Model, (the first model presented including the harm caused by the offence, the offender's prior criminal history, and prescribed aggravating features of the attack) explained almost half of the variance in the sentencing decision, the model offered a poor fit to the data. While each of the three succeeding models improved the model fit, it was the fifth model, incorporating legal variables, preliminary decisions, attitudes, and particularly the sentencer's evaluation of the `character' of the offender, which best represented the data, without sacrificing parsimony, in addition to accounting for almost two-thirds of the variance in the sentencing decision (65.3%). It was concluded that sentencing is a complex decision-making process, and that the judgment is based upon few offence and/or offender details. Firstly, a relatively small number of offence and offender characteristics accounted for the greater part of the variance in the sentencing decision. Judges however, appeared to organise the information provided in order to make assessments about the offender, in the manner predicted by Affect Control Theory. The overall result therefore, supported the complex decision-making process subscribed to by judges. Limitations of the research and the implications of these results for the main players in the process, the inclusion of psychological theory in the courtroom, and the community's understanding of the system, are discussed.
Krajewska, Anna Urszula. "Bioculturalism, simulation and satire : the case of S1mOne." Thesis, 2014. http://hdl.handle.net/10500/19614.
Повний текст джерелаThis study offers a close look at Andrew Niccol’s (b 1964) satirical film S1mOne from a biocultural perspective emphasising the technological simulation of a Hollywood celebrity and the farce ensuing from her creation. The film is based on Niccol’s assumption that the hypertrophied culture into which he places his cultural object will be one in which human traits of sociality will be well advanced and the highly demanding genre of satire will be entertaining, persuasive, and on occasion punitive in its ridicule of Hollywood. The study makes a contribution to the idea that a cultural object/text operates as a rapid mechanism for propagating cognition — it shows how Niccol has adapted to less than optimal conditions in his world of Hollywood — in this case he parodies the role of the director of Hollywood films in the figure of Taransky. Cognition is understood as that series of mental processes which include attention, memory, learning (from mimicry as well as other forms), problem solving, ratiocination, and making decisions. Niccol relies on his audience's embodied capacities and skills of recognition, thinking, feeling, remembering, and accounting for his message to be understood. Niccol’s technical skill in editing his narrative to emphasise the satire of the narrative of Taransky and Simone is a critical part of the film’s success. Interpersonal and social propagation of cognition is achieved through reference to other cultural artefacts recalling a variety of similar ideas used in film and other visual creations. The cultural significance of the simulacrum, Simone, is that she is a vehicle for and a form of socially propagated cognition. The powerful imagistic impression of film helps to structure internalised cognitive artefacts in the viewers who are expected to reflect on their habits of viewing and thinking. When a film, artwork, poem or novel is analysed, then such a cultural object becomes a vehicle of and for propagating cognition.
Art History, Visual Arts and Musicology
D. Litt. et Phil. (Art History)
El-Khatib, Mayar. "Highway Development Decision-Making Under Uncertainty: Analysis, Critique and Advancement." Thesis, 2010. http://hdl.handle.net/10012/5741.
Повний текст джерела