Дисертації з теми "Photon management"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Photon management".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
ANGELINI, ANGELO. "Photon Management on a Photonic Crystal Platform." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2611159.
Повний текст джерелаHassan, Safaa. "Optical Property Study of 2D Graded Photonic Super-Crystals for Photon Management." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703318/.
Повний текст джерелаHu, Lu. "Photon management in thermal and solar photovoltaics." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46496.
Повний текст джерелаIncludes bibliographical references (p. 150-161).
Photovoltaics is a technology that directly converts photon energy into electrical energy. Depending on the photon source, photovoltaic systems can be categorized into two groups: solar photovoltaics (PV) and thermophotovoltaics (TPV). In solar photovoltaic systems, the photon source is the sun, whereas in thermophotovoltaic systems the photons are from artificially designed thermal emitters that operate at a lower temperature. The differences in the photon sources lead to different research emphases on the two photovoltaic systems in this work. This thesis investigates ways to control photon emission and absorption for solar energy and TPV applications. Several topics are discussed, including photon transport in multilayer structures, measurement of near-field thermal radiation, optical absorption in silicon nanowire structures, surface-plasmon enhanced near-bandgap optical absorption in silicon, and selective absorber surface for solar thermal applications. For thermophotovoltaic systems, the work is focused on thermal emission and photon transport. The study of photon transport in multilayer structures is presented. Results based on wave-optics and ray tracing methods are compared. The analysis shows that for structures contain a large number of layers, the coherence length of the emitting source is no longer a valid criterion to indicate whether ray tracing method is valid. Instead, wave inference effects always play a role. The effects of photon localization are also discussed. Surface-mode enhanced near-field thermal radiation is explored in this work as an effective way to tailor the thermal emission for TPV systems. Calculations based on fluctuation-dissipation theorem and Maxwell's equations are presented to study radiative heat transfer between two closely-spaced glass plates. The theoretical analysis shows that the radiative heat transfer between closely-spaced glass plates is enhanced by surface phonon polaritions and the flux can exceed the far-field upper-limit imposed by Planck's law of blackbody radiation.
(cont.) An experimental system was built to test near-field radiative heat transfer between two parallel glass plates, and the experimental results show good agreement with the theoretical predictions. For solar photovoltaics, the emphasis in this work is on improving optical absorption in silicon-based cells. Two nanostructures, silicon nanowire arrays and silicon embedded with small silver particles, have been analyzed as potential candidates for solar energy harvesting. The study on silicon nanowire structures reveals that nanowires have desirable antireflection characteristics. Several parameters, such as the length and diameter of the nanowires as well as the spacing between the wires, have been studied to provide the basis for the optimization of nanowire based solar cells. The study shows that nanowire structures have low reflectance over a broad spectrum and can absorb shortwavelength photons efficiently. However, the analysis also indicates that silicon nanowire is not efficient in absorbing long-wavelength photons. Longer wires in comparison to the thickness of dense films are generally required to compensate low absorption of the near-bandgap photons. The analysis of surface-plasmon assisted photon absorption is presented to address the problem of inadequate absorption of near-bandgap photons in silicon. Instead of increasing the optical path of photons for more absorption, surface plasmons are explored to enhance the local electromagnetic field and thus the optical absorption. An extended Mie scattering formulation is used to calculate the optical absorption around spherical silver particles embedded in silicon. It is found that local field enhancement by surface plasmon can lead to 50 times more absorption near the bandgap of silicon. An analytical model is developed to study the concentration effects of the surface plasmon field. It is shown that the net absorption gain reaches maximum when the spherical shell surrounding the particle has an outer diameter of 1.26 times of the particle diameter. The absorption loss in the metallic sphere, however, is a main obstacle to overcome.
(cont.) Finally, a different approach of solar energy utilization is discussed in this work. Selective absorber surfaces are studied for solar thermal energy harvesting. The surfaces consist of subwavelength periodic metallic structures. Finite-Difference-Time-Domain (FDTD) analysis is conducted on the metallic structures. The effects of lattice spacing and structure thickness are presented. The numerical simulation indicates that the metallic structures have good spectral selectivity: high absorptance in visible range and low emittance in infrared. Fabrication of the selective absorber surface is attempted. Preliminary experimental results are given in this work. As a proof of concept, nickel is plated in porous anodic aluminum. The resultant structure shows good spectral selectivity which is not found in bulk nickel or aluminum.
by Lu Hu.
Ph.D.
ELSEHRAWY, FARID KHALED MOHAMED FARID. "Photon Management for Thin-Film Quantum Dot Solar Cells." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2843974.
Повний текст джерелаFahr, Stephan [Verfasser], Falk Akademischer Betreuer] Lederer, Bernd [Akademischer Betreuer] [Rech, and Dietmar [Akademischer Betreuer] Knipp. "Photon-Management in Dünnschicht-Solarzellen / Stephan Fahr. Gutachter: Falk Lederer ; Bernd Rech ; Dietmar Knipp." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2012. http://d-nb.info/1019969660/34.
Повний текст джерелаZAFFALON, MATTEO LUCA. "Advanced Spectroscopic Investigations of Colloidal Semiconductor Nanostructures for Photon Management and Radiation Detection Schemes." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/366215.
Повний текст джерелаDuring my PhD I investigated excitonic recombination mechanisms in colloidal semiconductor nanocrystals (NCs), promoting the development of new paradigms for the manipulation of optical and scintillation properties. Thanks to the wide range of spectroscopic techniques and the valuable collaborations undertaken, my conclusions have been published in prestigious scientific journals, contributing to the advancement of the community of nanomaterials scientists. My research mainly dealt with two topics of current technological importance: i) the origin of photoluminescence in NC of Cd-free ternary I-III-VI2 chalcogenides such as CuInS2 and AgInS2 ii) the use of perovskite nanostructures in detection schemes and/or energy conversion of ionizing radiation. Specifically, the use of complementary spectroscopic techniques in a controlled temperature regime has validated the presence of intrinsic sublevels, with different parity, in the valence band of the stoichiometric CuInS2 NCs responsible for the optical properties of this class of NC. My results, supported by Monte Carlo ray-tracing simulations, led to the fabrication of a luminescent solar concentrator - with record efficiency - based on CuInS2 NCs with optimal size. The study was then extended to AgInS2 NCs, a less investigates material so far, but very promising for bioimaging applications thanks to the absence of toxic elements. Then, I investigated the detection of ionizing radiation through high atomic number nanostructures such as lead halide perovskites (LHP), and in particular CsPbBr3. Through the detailed study of photo- and radio-luminescence properties, I highlighted the effects of the interaction between band edge exciton and shallow/deep defect states in CsPbBr3 nanostructures with different dimensionality. This fundamental study offered a platform to develop novel synthetic strategies to passivate trap sites on NC surfaces that led to a 500% enhancement of scintillation yield. The stability of CsPbBr3 NCs was finally verified in terms of radiation hardness, up to extreme gamma doses of 1 MGy. Furthermore, to extend their application to radiation detection with waveguiding devices, I studied the sensitization of an organic dye coupled to CsPbBr3 NCs, creating the first example of a plastic scintillator with wide Stokes-shift and fast luminescence based on LHP. To overcome the limitations imposed by the presence of Pb in LHPs, I finally explored the optical and scintillation properties of new emerging classes of green double perovskites. The information gathered encourages the continuation of this line of research, indicating surface passivation as the most promising strategy for achieving performance similar to the Pb-based counterparts.
Sundaresan, Sasi Sekaran. "ATOMISTIC MODELING OF PHONON BANDSTRUCTURE AND TRANSPORT FOR OPTIMAL THERMAL MANAGEMENT IN NANOSCALE DEVICES." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/dissertations/854.
Повний текст джерелаBrady, Benjamin Arthur. "Automation in digital photo management." [Ames, Iowa : Iowa State University], 2007.
Знайти повний текст джерелаPaniagua, Laconich Eduardo Javier. "Event-centric management of personal photos." Doctoral thesis, Università degli studi di Trento, 2015. https://hdl.handle.net/11572/368583.
Повний текст джерелаPaniagua, Laconich Eduardo Javier. "Event-centric management of personal photos." Doctoral thesis, University of Trento, 2015. http://eprints-phd.biblio.unitn.it/1537/1/paniagua-phd-thesis.pdf.
Повний текст джерелаFerreyra, Romualdo A. "Electron – phonon interaction in multiple channel GaN based HFETs: Heat management optimization." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3636.
Повний текст джерелаElliott, Brendan David. "Hierarchical and Semantic Data Management and Querying for Patient Records and Personal Photos." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1226303040.
Повний текст джерелаCohen, Jonathan Morris. "Stakeholder attitudes toward forest management in southern Illinois : an application of photo-evaluation surveys /." Available to subscribers only, 2008. http://proquest.umi.com/pqdweb?did=1594480701&sid=13&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Повний текст джерелаSamadian, Parya. "Photonic Integrated Circuits Challenges & Solutions: Homogenization, Polarization Management and Coupling." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33352.
Повний текст джерелаShane, Ryan S. "Riparian photo-monitoring : detecting change in selected lotic riparian system attributes /." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1455659.
Повний текст джерела"May, 2008." CD-ROM contains Adobe Acrobat copy of thesis, power-point presentation entitled: Effectiveness and reliability of photo-pair interpretation, and photographs taken during the study. Includes bibliographical references. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
Kaul, Pankaj B. "Thermal Transport in Tin-Capped Vertically Aligned Carbon Nanotube Composites for Thermal Energy Management." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1383515941.
Повний текст джерелаBanasik, Robert Michael. "Marketing Strategies Used by Specialty Photo Retailers to Grow Revenues." ScholarWorks, 2016. https://scholarworks.waldenu.edu/dissertations/2468.
Повний текст джерелаYuen, Siu Yu. "Routing and time-slot assignment algorithms and connection management in photonic circuit switched networks /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20YUEN.
Повний текст джерелаCurtin, Benjamin Michael. "Photonic crystal back-reflectors for light management and enhanced absorption in a-Si:H solar cells." [Ames, Iowa : Iowa State University], 2009. 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:1468075.
Повний текст джерелаToccaceli, Cecilia. "Geo Photo Routing: raccomandazione dell'itinerario di viaggio utilizzando i geotag dei siti di condivisione foto." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13766/.
Повний текст джерелаSjödin, Erik. "Pixgis : An Application for Map-centric Management of Photographs with Embedded Spatial Metadata." Thesis, Linköping University, Department of Science and Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8002.
Повний текст джерелаThis thesis presents Pixgis; a novel application for map-centric management of photographs. In short Pixgis is an interactive environment in which photographs may be discovered, viewed and managed through maps. With Pixgis finding photographs from a specific location or of a particular structure is as easy as finding the location or structure on a map. As Pixgis simultaneously displays maps, photographs and spatial metadata it also enables users to analyze photographs in new manners. This thesis work illustrates the benefits of applications for map-centric management of photographs, exposes the problems one faces when implementing such applications and presents novel solutions to many of these problems. The thesis also elaborates on spatial metadata and methods for acquisition of photographs with embedded spatial metadata.
Bonezzi, Mirko. "GEO PHOTO ROUTING: Progettazione ed implementazione di una applicazione per routing pedonale." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14427/.
Повний текст джерелаTurley, Helene. "Through the lens : using auto-driven photo-elicitation to capture the development of career aspirations of business management and fine art students." Thesis, University of Wolverhampton, 2018. http://hdl.handle.net/2436/621282.
Повний текст джерелаHawkins, William Cory. "Evaluation of the data vortex photonic all-optical path interconnection network for next-generation supercomputers." Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-12182006-155304/.
Повний текст джерелаDr. Henry L. Owen III, Committee Member ; Dr. David Keezer, Committee Member ; Dr. D. Scott Wills, Committee Chair.
Doyeux, Pierre. "Energy management at the quantum scale : from thermal machines to energy transport." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTS070/document.
Повний текст джерелаThis thesis deals with energy management in open quantum systems. Three different systems are under study in the limit of weak system-environment coupling, and their dynamics is described by Markovian quantum master equations. In the first chapter, the complete derivation of such equation is performed in a specific case, and several notions of quantum thermodynamics are introduced. In the first system, energy transport is investigated along atomic chains (between 2 and 7 atoms) embedded in blackbody radiation around room temperature. It is shown that the transport efficiency can reach remarkable values, exceeding 100% and reaching 1400% in some configurations. Moreover, when the efficiency is amplified, the transport range is also considerably increased. The following chapter also deals with energy transport in atomic chains. The quantum system is located at the interface of a photonic topological insulator (PTI), supporting a unidirectional surface-plasmon-polariton (SPP) immune to backscattering. The SPP propagates along the chain and assists energy transport. Comparison is made between reciprocal and unidirectional SPPs in terms of transport efficiency, and it is shown that the latter can yield an efficiency larger by one order of magnitude. In addition, several practical aspects stemming from PTIs are highlighted, including the robustness of energy transport in the presence of defects on the SPP path. In the last chapter, a quantum system embedded in an out-of-thermal-equilibrium electromagnetic field is investigated. It is composed of a three-level atom playing the role of an absorption quantum thermal machine, as well as N two-level atoms ('qubits'), with N=1,...,6, which are the target bodies. It is demonstrated that the machine is able to perform significant thermal tasks on the qubits, even when their number is increased. Moreover, it is pointed out that due to qubit-qubit interactions, the tasks delivered by the machine are distributed throughout the system of interacting qubits, such that in some cases the temperature of the qubits which are completely decoupled from the machine can still be considerably affected by it. This task-distribution mechanism is investigated by means of the correlations between different subparts of the system. In addition, the tuning of thermal tasks is discussed
Wolfe, Kimberly. "Flat Files: The Absence of Vernacular Photography in Museum Collections." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/163.
Повний текст джерелаNeenan, Johnathan. "Evaluation of Stream Bank Restoration to Improve Water Quality in a Semi-Arid Stream." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7687.
Повний текст джерелаReihammar, Emma. "Mönstersimulering av kamouflage : Framtagning av metodik för virtuell utvärdering av visuell maskeringsförmåga." Thesis, Uppsala universitet, Industriell teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-430015.
Повний текст джерелаSaab Barracuda develops and manufactures advanced camouflage systems for protection against detection and identification through signature management. Signature management is a fundamental part of the tactical strategy of military forces and is achieved by reducing the contrast against the background of appropriate wavelength ranges within the electromagnetic spectrum. In the visual field, signature differences are mainly reduced by colors and patterns, which are adapted to the target's tactical environment. In order to enable optimization of camouflage, it is important to be able to evaluate the effectiveness of the various influencing properties when it comes to reducing an object's signature, which further refers to the characteristics of an object that distinguish it from its surroundings. Nowadays, this is mainly done through field studies. The method provides an accurate picture of the dynamic range that occurs in reality, but the combination of different types of objects, terrains, tactical distances and environmental-related parameters quickly makes the evaluation process a time and resource consuming process. The purpose of this thesis is to develop a method for virtual evaluation of a camouflage visual signature in order to make the development process more time and resource efficient. The approach consists of document studies in combination with simulation studies. The methodology used to achieve the method follows Design research methodology (DRM), which aims to provide an understanding of processes and develop support to improve or optimize them. The results of the study together form a workflow for virtual evaluation of different patterns. A 3D model of the camouflage net has been developed and a method for collecting 2D images of terrains is described. The method enables evaluation at different observation distances and viewing angles where patterns and backgrounds easily can be changed. Sun and weather data can be adapted to the image to visually obtain a realistic result. Evaluation is done in Adobe Dimension and the model has been created in Autodesk 3ds max. The settings used to mimic the mechanical and spectral properties of the physical camouflage were approximated by subjectively comparing the optical contrast between simulation and photo. The result was presented for the research and development team on Saab Barracuda with 14 persons being present.
Leblois, Richard. "Solar Impulse - Around the World in a Solar Airplane." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-86938.
Повний текст джерелаEsmeier, Chelsea Marie. "Impact of Female Adolescents’ Motivations for Managing Online Photographic Self-Presentations on Their Social and Psychological Wellbeing." Xavier University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=xavier1554114196609514.
Повний текст джерелаBelletti, Barbara. "Analyse régionale de la structure et de la dynamique biogéomorphologiques des rivières en tresses du bassin du Rhône." Thesis, Lyon 3, 2012. http://www.theses.fr/2012LYO30099.
Повний текст джерелаThe landscape of the braided rivers is characterised by a rich and diversified mosaic of habitats. The variability of the braided riverscape depends upon the combination of bio-physical factors, which interact at the different spatial and temporal scales.We did a comparative analysis at the regional scale of 53 braided reaches selected in the Rhône basin district. We used a remote sensing-based approach.At first, we analysed the aquatic habitat and the river channel pattern. We showed that the braiding and aquatic habitat patterns do not depend only on the flow regime but also on some local scale conditions, such us the sediment regime and the presence of the “near-floor” groundwater.Secondly, we moved on the overall riverscape corridor, and we applied a diachronic analysis comparing the present state of reaches with their state at the mid of the last century. The results show that not all studied braided reaches are narrower today compared to the 1950s and that some reaches are even wider. It is linked to a combination of several factors, such as the geographical position of a reach in its catchment and the short-term evolution ruled by recent large floods, as well as the history of the catchment linked to human settlements.Then we focused on the evolutionary trajectories followed by a sub-set of 12 braided reaches through time, and we increased the temporal resolution, for a total of five dates per reach. The results show that reaches follow different trajectories depending on: the hydrological conditions at a given period (e.g. floods), the geographical position of a reach at the regional scale and the anthropic context. Additionally, it seems that also local conditions (in terms of topography, sedimentation, and soil moisture), play an important role in determining the biogeomorphological pattern of the studied reaches.From these results, we discussed some perspectives for the braided river management in the Rhône basin district
PESTANA, Rayner Carvalho. "Para a implanta??o da meritocracia na gest?o de carreira: implica??es dos contextos cultural, gerencial e pol?tico de uma empresa estatal federal brasileira." Universidade Federal Rural do Rio de Janeiro, 2015. https://tede.ufrrj.br/jspui/handle/jspui/1343.
Повний текст джерелаMade available in DSpace on 2016-10-25T18:52:13Z (GMT). No. of bitstreams: 1 2015 - Rayner Carvalho Pestana.pdf: 3842091 bytes, checksum: 6249d189977450bb8ee9dbbc3e59483d (MD5) Previous issue date: 2015-07-03
The transformation of the Brazilian Public Management, specifically about the adoption of modern tools for human resources, has been happening since the last century and the concern about the introduction of meritocracy in career management is still considered a recurring theme. An evidence of that is the guidance from management and control department of federal state-owned companies to adopt meritocracy in their career management systems. The organization studied here, although already have passed thirteen years of validity of its current jobs and salaries plan, seems not yet to have been able to establish career management policies based on meritocracy. Due to the problem presented, the main objective of this research focused on raising the implications of the organizational context of a Brazilian federal state-owned company, dependent on the Treasury, for the introduction of meritocracy in career management. An applied qualitative research was carried out, configured in the form of a single case study to map the features of the current cultural, managerial and political contexts and to interpret their implications in the adoption of meritocracy as an organizational value. The research subjects were purposefully selected, among managers and career employees, and interviewed based on a script and from a photograph (photo elicitation) to reveal the current context. The field data were subjected to an inductive hermeneutic analysis. Based on these results, it can be inferred that meritocracy in career management, understood as ?a set of criteria, adopted by an organization that has on individual performance, effort and results, the fundamental pillars for granting promotions and progressions to its employees in their own careers?, is not yet explicitly manifested in the studied company. It was perceived that the company is set as a political arena type and that the current alternative process of granting promotions and progressions has been working as a fundamental mechanism for the on going internal power dynamics. On the context found, some manager actions were proposed to contribute to the implementation of meritocracy in career management. It can be considered, as a contribution to the field, the opportunity for reflecting on the negative implications of the penetration of management values in human resources, regarding: uncritical transfer of tools from the private sector to the public one; defense of entrepreneurship discourse that considers the career management as sole responsibility of the professional; only financial and quantitative focus on performance evaluations; and probability of management tools not resulting in professional development but only in the control and exploitation of the individual. For future research it is suggested i.e.: to investigate what commitment means to the organizational members in order to connect it to the company's concepts raised in the study; to analyze meritocracy from the psychological contract breach viewpoint; and to expand this study to other public organizations dependent or not on the Treasury, to ascertain the implications of cultural and managerial traits and the power dynamics for the adoption of meritocracy in career management.
A transforma??o da Administra??o P?blica Brasileira, no que tange ? ado??o de ferramentas modernas de gest?o de pessoas, vem ocorrendo desde o s?culo passado e a preocupa??o com a meritocracia na gest?o de carreira se configura como um assunto ainda recorrente. Como prova disso, destacam-se as orienta??es do ?rg?o de gest?o e controle das empresas estatais federais para que elas adotem a meritocracia nos seus sistemas de gest?o de carreira. A organiza??o aqui estudada, embora passados treze anos de vig?ncia do atual plano de cargos e sal?rios, parece ainda n?o ter conseguido instituir pol?ticas de gest?o de carreira calcadas na meritocracia. Diante do problema apresentado, o objetivo principal desta pesquisa se concentrou em levantar as implica??es dos tra?os provenientes do contexto organizacional de uma estatal federal brasileira, dependente do Tesouro Nacional, para a implanta??o da meritocracia na gest?o de carreira. Realizou-se pesquisa aplicada de natureza qualitativa, configurada em forma de estudo de caso ?nico para mapear os tra?os do contexto cultural, gerencial e pol?tico vigentes e interpretar suas implica??es na ado??o da meritocracia como um valor organizacional. Os sujeitos da pesquisa foram selecionados pelo m?todo proposital, entre gerentes e empregados de carreira, e entrevistados mediante roteiro e a partir de uma fotografia (elicita??o fotogr?fica) que revelasse o contexto vigente na ?tica dos mesmos. Os dados de campo foram qualitativamente analisados de forma hermen?utico-indutiva. Com base nos resultados obtidos, conclui-se que a meritocracia na gest?o de carreira, entendida como ?o conjunto de crit?rios, adotado por uma organiza??o, que possui no desempenho, no esfor?o individual e nos resultados alcan?ados os pilares fundamentais para a concess?o de promo??es e progress?es dos empregados em suas respectivas carreiras?, n?o ?, ainda, praticada explicitamente na empresa estudada. Revelou-se que a empresa se configura como uma organiza??o do tipo arena pol?tica e que o vigente processo alternativo de concess?o de promo??es e progress?es tem funcionado como um mecanismo fundamental na din?mica interna de poder. Diante deste contexto, foram propostas a??es de forma a contribuir com a implanta??o da meritocracia na gest?o de carreira. Considera-se como contribui??o ? ?rea a oportunidade de reflex?o sobre as implica??es da penetra??o de valores do management na gest?o de pessoas, relativas a: transfer?ncia acr?tica de ferramentas do setor privado para o p?blico; defesa do discurso do empreendedorismo, pressupondo a gest?o de carreira como responsabilidade unicamente do profissional; perspectiva apenas financeira e quantitativa das avalia??es de desempenho; e probabilidade das ferramentas de gest?o n?o resultarem no desenvolvimento profissional, mas no controle e explora??o do indiv?duo. Para aprofundamento em futuras pesquisas, sugere-se, dentre outras a??es: investigar o conceito de comprometimento na organiza??o, conectando-o ?s concep??es da Empresa levantadas no estudo; analisar a meritocracia a partir da ?tica da quebra do contrato psicol?gico; e expandir a presente pesquisa a outras organiza??es p?blicas dependentes ou n?o do Tesouro, a fim de evidenciar as implica??es dos tra?os culturais e gerenciais e da din?mica de poder existentes na ado??o da meritocracia na gest?o de carreira.
Fu, Po-Han, and 傅柏翰. "Photon Management Employing Photonic Crystal in InGaN Quantum Well Based Devices." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/60592543639443752414.
Повний текст джерела國立臺灣大學
光電工程學研究所
100
In this study, the schemes of enhancing the performances of indium gallium nitride (InGaN) based multiple quantum well (MQW) solar cells and light-emitting diodes (LEDs) are investigated. For the enhancement of conversion efficiencies of solar cells, SiO2 nano-honeycomb photonic crystals are fabricated on the devices. The nano-honeycombs are found to be effective in suppressing the undesired surface reflections over visible wavelengths. Under the illumination of air mass 1.5G solar simulator, conversion efficiency of the solar cell is enhanced by 34 %. To investigate light propagation behaviors across the interfaces, simulations based on finite-difference time-domain (FDTD) method are also carried out. In addition, 3 layer of PS nanospheres can be coated on the device based on the optimization design by simulations, contributing to the 30% enhancement of conversion efficiency. One of the major bottlenecks restricts light extraction efficiency of LEDs is the limited photon escape cone for light emission. SiO2 nano-honeycombs diffract the waveguide mode out of the device by providing an additional wave vector. At the current injection of 400mA, the optical power of the device is enhanced by 78 %.
Hsu, Chia-Yang, and 徐嘉陽. "Nanoscale Design to Enable the Photon Management." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/04645996116647920513.
Повний текст джерела國立臺灣大學
光電工程學研究所
100
Nanostructures have shown great potential toward better performance than their bulk counterparts. However, every nanomaterials have their own limits, and thus future applications are being hindered. For making a breakthrough, in this study, we show a possible solution by combining two different nanomaterials together. By means of atomic layer deposition, the core-shell multiwalled carbon nanotubes (MCNTs)-TiO2/ZnO nanostructures could make the thickness control accurate. Duo to the potential applications of secure communication, a sensitive and fast photodetector (PD) is strongly desirable. However, the core-shell nanowires (NWs) not only converse the high photoconductive gain of the metal oxide semiconductor but also further promote the response speed. This material may pave a promising way for multifunctional NW-based optoelectronics in the future. In addition, a model concerning the connections between two materials is proposed to explain the high photoconductive gain and the fast response speed. First of all, a broadband, fast, and sensitive PD is realized on the basis of MCNT-TiO2 core-shell NW geometry. The devices exhibit high photoconductive gain up to 104 and fast response/recovery times of 4.4/10.2 ms. Advances in the carrier separation occurred in the radial junction in core-shell architecture, the collection of charge could be enhanced. Herein, the interaction between MCNT and TiO2 is demonstrated by photocurrent generation and temporal behavior under varying wavelength illumination. The high photoconductive gain and fast response/recovery times are attributed to the presence of oxygen-related hole-trap states at the NW surface and the radial local electric field between MCNT cores and TiO2 shells duo to Schottky junctions. Furthermore, duo to the optoelectronic properties of core-shell NW, the material has great potential in photovoltaic cells applications. Finally, for astronomical studies and optical communication, self-powered UV devices are much more desired. Herein, we employ the advantages of core-shell nanostructures to fabricate ultrafast, and self-powered ultraviolet (UV) PDs. Although the self-powered devices have been studied recently on the basis of NW-aligned arrays, little attention has paid on driving practical device by a single NW. We not only demonstrate sensitive MCNT-ZnO core-shell NW device with responsivity of 200 A/W and photoconductive gain of 800 under UV laser (325 nm, 100 mW/cm2) but also operate without an external power supply to continuously drive a commercial liquid crystal display. Furthermore, we show the first fast-speed demonstration of MCNT-ZnO-based PDs in vacuum condition with response/recovery times of 29/30 ms duo to the advantages of radial Schottky junctions and thin ZnO shells. We provide multifunctional coaxial nanostructures for the promising application in the future.
Chang, Hung-Chih, and 張閎智. "Photon Management in Si-Based Solar Cells." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/32878939324121539000.
Повний текст джерела國立臺灣大學
光電工程學研究所
99
In this thesis, first, the nanowire array (NWA) layers with controlled structure profiles fabricated by maskless galvanic wet etching on Si substrates are found to exhibit extremely low specular reflectance (< 0.1 %) in the wavelengths of 200-850 nm. The significantly suppressed reflection is accompanied with other favorable antireflection (AR) properties, including omnidirectionality and polarization-insensitivity. The NWA layers are also effective in suppressing the undesired diffuse reflection. These excellent AR performances benefit from the rough interfaces between air/NWA layers and NWA layers/substrate and the decreased nanowire densities, providing the gradient of effective refractive indices. The Raman intensities of Si NWAs were enhanced by up to 400 times as compared with the signal of the polished Si, confirming that the NWA layers enhance both insertion and extraction efficiencies of light. This study provides an insight into the interaction between light and nanostrucutres, and should contribute to the structural optimization of various optoelectronic devices. Second, wafer-scale nanowire arrays (NWAs) with hierarchical structure, combined the nanowire and interface micro-roughness were fabricated by single process of costless wet etching. The NWA based solar cells with designed hierarchical structure demonstrate excellent light-harvesting characteristics, such as broadband working ranges and omnidirectionality in external quantum efficiency and reflectance measurement. Compared to the polished Si and conventional NWAs, the solar cell with hierarchical structure exhibits significantly superior photovoltaic characteristics, i.e., short-circuit current of 32.7 mA/cm2 and conversion efficiency of 11.25 %. The enhanced photovoltaic performances agree with the theoretical analysis based on a finite-difference time-domain method. A viable scheme for light harvesting using the hierarchical structure employing micro-roughness/nanoscale surface textures on single crystalline Si solar cells has been demonstrated. Third, antireflective Si/oxide core-shell nanowire arrays (NWAs) were fabricated by galvanic etching and subsequent annealing process. The excellent light-harvesting characteristics of the core-shell NWAs, such as broadband working ranges, omnidirectionality, and polarization-insensitivity, ascribed to the smooth index transition from air to the substrates, have been demonstrated. By tuning core-shell volume ratios, we obtained enhanced light trapping regions implemented in either the planar Si underneath NWAs or the core regions of NWAs, greatly benefiting the geometry design of planar and radial p-n junction cell structures, respectively. This photon management scheme indicates the potential use in nanostructured photovoltaic applications. Finally, rough AZO films were employed to enhance the internal scattering and consequent optical absorption of thin film (amorphous/polycrystalline Si) tandem solar cells. Through the optimization work by simulations, the matched current densities from the top and the bottom cells were obtained with the device structure containing 1.5-μm roughened polycrystalline Si layer, which produces the efficiencies comparable to those of the 3.5-μm layer without roughening. The simulation results were supported by the device performances measured experimentally. The significantly enhanced light scattering in the thin rough active region was revealed by the calculation results based on finite-difference time-domain method. The concept and technique presented in this study should benefit the development of next generation of thin film solar cells.
Hsiao, Yu-Hsuan, and 蕭宇瑄. "Photon management and radiation resistance of InGaN-based quantum well devices." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/32826052654303351129.
Повний текст джерелаKijatkin, Christian. "Ultrafast Photon Management: The Power of Harmonic Nanocrystals in Nonlinear Spectroscopy and Beyond." Doctoral thesis, 2019. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201904011323.
Повний текст джерелаWinterton, Ruth. "The use of technetium 99m hexa-methyl propylene amine oxime spect scanning in acute stroke management." Thesis, 1991. https://hdl.handle.net/10539/26446.
Повний текст джерела19 patients were selected, from the patients screened, for investigation within 48 hours of the onset of an ischaemic cerebrovascular accident. Clinical neurulogical scoring, computerized tomography lCT) scans and single photon emission computed tomography (SPECT) scans were performed on day 1, day 10 and day 30. SPECT scan data was analysed by 5 semi-quantitative methods, and findings were compared with neuroloyical clinical scores on each respective day. It was found that day 1 SPECT scans are of value for early localization of the acute ischaemic infarction. A multiple regression model was developed using both the day 30 Defect Volume index and segmental analysis score which related to the day 30 clinical scores. The day 1 model was unsatisfactory and no such model was found relating day 10 SPECT semi-quantitative methods to day 10 clinical scoring. Changes in semi-quantitative scores from day 1 to day 30 did not correlate with clinical changes. Longer follow up may be required for there to be value in performing SPECT scans in stroke trials. A prognostic equation was derived by multiple regression analysis of day 1 SPECT scan scores and day 30 clinical scores.
Andrew Chakane 2019
Liao, Han-Teng, and 廖漢騰. "Blog-Based Photo Management System." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/04827736108074410865.
Повний текст джерела國立臺灣大學
資訊工程學研究所
92
Most photo management systems are based on the concept of albums with that of category. This paper proposed an alternative that is based on the concept of blog systems, using hyperlinks (or trails) and semantic markup to manage photos. The approach is improved by an examination of the issues related to personal archive systems. The implementation of this approach adopts several standards. In order to keep the information safe from the so-called "Dear Appy" problem (the data files of certain application programs might not be accessible at all times, especially when those programs become obsolete), our implementation adopts XHTML standard. Our implementation includes one-to-many hyperlinks that can be used both as a way of organizing data. The implementation of one-to-many hyperlinks also works with current browsers and is similar to the future standard of one-to-many hyperlinks described in XHTML 2.0 working draft. Our implementation also introduces and designs some semantic markups related to photo management. Finally our implementation also transforms the semantics-rich hyperlinks into RDF data; and with these RDF data, it also produces a graph that demonstrates the relationship between resources.
Liu, Ming-Liang. "Photoware Interface Design for Better Photo Management." Thesis, 2006. http://hdl.handle.net/1805/620.
Повний текст джерелаDigital photography has largely replaced traditional film-based photography. Low cost and easy creation of digital files encourage people to take more photographs (photos) than before. Photo management involves selecting photos for placement into albums for future review and publishing them through different media in order to share with others. Photoware is designed to help people manage a large amount of digital photographs. To manage digital photos more efficiently, not only does software performance need to be improved, but also the usability of the software design needs to be refined. Well designed interfaces are one of the solutions to expedite the photo management tasks. The purpose of the study was to design a new photoware interface that would allow users to execute photo management tasks more efficiently. A three-phase study was designed to assess and compare Adobe Photoshop Album with Google Picasa. Phase one identified two major features that were problematic: 1) visibility of images with the photo tray features and 2) the non-existence of export templates that allow photo format settings to be placed into memory for future use. In Phase two, these two features were designed and implemented through paper and dynamic prototypes. Phase three consisted of usability testing of the prototypes. Thirty university students participated in a time-on-task study to measure the performance of the new interface. Also, user preferences were recorded through a post-task questionnaire. The users performed more quickly on the interface design with the two new features, as well as preferred them over the existing products when using mean values. However, the statistical correlation (Spearman - rank order correlation) between the two usability variables was not significant. The lack of correlation was supported by Frøkjær et al.’s view that usability measures should be considered independently. In other words, task time performance alone cannot be used to predict general user preference, because subjective preference could be affected by a range of other factors.
Hsieh, Bing-Cheng, and 謝秉承. "A Photo Management System Based on Face Recognition." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/vt5upc.
Повний текст джерела國立臺北科技大學
資訊工程系研究所
97
With the increasing availability of digital cameras, one can easily collect a large number of photos. In this paper, we present a prototype system aimed to achieve efficient management of photos of people. Using current face detection and recognition technologies, we provide both automatic and semi-automatic methods to facilitate the job of associating photos to people. A series of preprocessing methods are taken to improve recognition rate for faces captured in varying lighting conditions and poses. We found that a personal photo collection of a single event may contain only a limited group of people. We can set up a face classifier specific for the group of people. A threshold scheme separates people not in the group or faces that can not be confidently identified apart. The organized result helps pick out incorrectly identified faces. A semi-automatic approach is used to deal with the leftovers by giving three candidates to choose from. Our proposed system is equipped with comprehensive user interface designed for these tasks. We conducted a simulation of this usage showing that it can dramatically reduce the amount of work on a very large set of photos.
I-Feng, Huang. "High Performance Fault Management Schemes for Photonic Networks." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0009-0112200611292333.
Повний текст джерелаHuang, I.-Feng, and 黃一峰. "High Performance Fault Management Schemes for Photonic Networks." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/16844265990243567167.
Повний текст джерела元智大學
資訊工程學系
93
ABSTRACT This dissertation proposes a tabular method and a mesh-ring search method for designing fault management mechanisms in Optical Multistage Interconnection Networks (OMINs) and Wavelength Division Multiplexing (WDM) networks, respectively. Limitations of previous literature are discussed, in which heuristic methods are adopted to diagnose crosstalk fault for OMINs. A deterministic algorithm called tabular method is then proposed to record all possible conflicting connections into a table; the connections are then assembled into several conflict-free test set. The first application is used to identify the optimal testing procedure from all possible solutions in the crosstalk fault diagnosis. Results of the proposed method always closely correspond to the optimal fault clusters or minimal test sets for crosstalk fault detection and location procedures. The second application of the tabular method is used to design a fault tolerant mechanism, which is called a fault-free connections scheduling algorithm in the Dilated Benes Network (DBN). The proposed algorithm establishes connections between arbitrary input/output pairs in a minimum number of rounds and averts faulty switches to increase system reliability in DBN. The OMINs can be utilized as major components in the WDM networks, including Optical Add-Drop Multiplexer (OADM), Optical Cross-Connect (OXC), and star coupler, to exchange optical signals. Once the OMINs components in the WDM networks have deteriorated, the entire system performance declines. This dissertation also designs a fault tolerant mechanism for WDM networks. The fault tolerant (commonly referred to as fault recovery) mechanism for WDM networks can be categorized as either protection or restoration. In the protection mechanism, each connection reserves backup paths statically during call setup. In the restoration mechanism, each connection that traverses a failed block discovers dynamically an adaptive backup route after failures occur. For various fault protection requests, the protection mechanism can be either a dedicated or shared facility. Depending on where a detour originates, the fault recovery mechanism can be classified into either link, path or segment recovery method. While previous studies addressing fault recovery issue in WDM networks largely focused on the link and path recovery, segment recovery in WDM networks has seldom been investigated. Networks have become increasingly complex given the accelerated demand for a larger bandwidth. Mesh networks are widely considered to be flexible, scalable, bandwidth-efficient, cost effective, and dynamic. Therefore, this dissertation investigates segment recovery schemes in the WDM mesh networks. To consider their feasibility, a mesh-ring search method is proposed to derive the adaptive recovery paths. Each node in the networks searches independently for its own mesh-rings; these mesh-rings then become adaptive recovery paths after calculation. The first application is used to design a segment protection mechanism in WDM networks, and then two schemes are presented. The first scheme in this application is called Dynamic Shared Segment Protection (DSSP). This algorithm uses pre-calculated mesh-rings to divide the working path into several working segments; resources are then reserved to protect these working segments. The proposed DSSP algorithm can utilize resources efficiently and increase the rate of successful protection, making it applicable in arbitrary mesh networks. The second scheme in this application is in the implementation perspective of segment protection, which is called Overlap Segment Protection (OSP) and Non-Overlap Segment Protection (NOSP). This scheme also applies pre-calculated mesh-rings to construct adaptive protection segments, which can or cannot overlap each other. The second application is used to design a fault restoration mechanism called Dynamic Multiple Ring Algorithm (DMRA) for the WDM mesh networks. DMRA pre-computes the mesh-ring architecture before faults occur enabling the proposed DMRA algorithm to recover quickly from failures and determine how to allocate recovered traffic loads based on the current traffic load and the network bandwidth along the restoration paths. The third application integrates previous applications to design a recovery mechanism called Guaranteed Quality of Recovery (GQoR). Four classes of priority for GQoR mechanism are applied based on the customer’s request, with each one mapped to the adaptive recovery method. The GQoR mechanism confirms that customers possess an efficient recovery time and sufficient backup resources. The above fault management methods in photonic networks are introduced, developed, and simulated herein. Simulation results demonstrate the feasibility of applying the proposed methods in real-world networks.
"Digital photo album management techniques: from one dimension to multi-dimension." 2005. http://library.cuhk.edu.hk/record=b5892580.
Повний текст джерелаThesis submitted in: November 2004.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2005.
Includes bibliographical references (leaves 96-103).
Abstracts in English and Chinese.
Abstract --- p.i
Acknowledgement --- p.iv
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- Motivation --- p.1
Chapter 1.2 --- Our Contributions --- p.3
Chapter 1.3 --- Thesis Outline --- p.5
Chapter 2 --- Background Study --- p.7
Chapter 2.1 --- MPEG-7 Introduction --- p.8
Chapter 2.2 --- Image Analysis in CBIR Systems --- p.11
Chapter 2.2.1 --- Color Information --- p.13
Chapter 2.2.2 --- Color Layout --- p.19
Chapter 2.2.3 --- Texture Information --- p.20
Chapter 2.2.4 --- Shape Information --- p.24
Chapter 2.2.5 --- CBIR Systems --- p.26
Chapter 2.3 --- Image Processing in JPEG Frequency Domain --- p.30
Chapter 2.4 --- Photo Album Clustering --- p.33
Chapter 3 --- Feature Extraction and Similarity Analysis --- p.38
Chapter 3.1 --- Feature Set in Frequency Domain --- p.38
Chapter 3.1.1 --- JPEG Frequency Data --- p.39
Chapter 3.1.2 --- Our Feature Set --- p.42
Chapter 3.2 --- Digital Photo Similarity Analysis --- p.43
Chapter 3.2.1 --- Energy Histogram --- p.43
Chapter 3.2.2 --- Photo Distance --- p.45
Chapter 4 --- 1-Dimensional Photo Album Management Techniques --- p.49
Chapter 4.1 --- Photo Album Sorting --- p.50
Chapter 4.2 --- Photo Album Clustering --- p.52
Chapter 4.3 --- Photo Album Compression --- p.56
Chapter 4.3.1 --- Variable IBP frames --- p.56
Chapter 4.3.2 --- Adaptive Search Window --- p.57
Chapter 4.3.3 --- Compression Flow --- p.59
Chapter 4.4 --- Experiments and Performance Evaluations --- p.60
Chapter 5 --- High Dimensional Photo Clustering --- p.67
Chapter 5.1 --- Traditional Clustering Techniques --- p.67
Chapter 5.1.1 --- Hierarchical Clustering --- p.68
Chapter 5.1.2 --- Traditional K-means --- p.71
Chapter 5.2 --- Multidimensional Scaling --- p.74
Chapter 5.2.1 --- Introduction --- p.75
Chapter 5.2.2 --- Classical Scaling --- p.77
Chapter 5.3 --- Our Interactive MDS-based Clustering --- p.80
Chapter 5.3.1 --- Principal Coordinates from MDS --- p.81
Chapter 5.3.2 --- Clustering Scheme --- p.82
Chapter 5.3.3 --- Layout Scheme --- p.84
Chapter 5.4 --- Experiments and Results --- p.87
Chapter 6 --- Conclusions --- p.94
Bibliography --- p.96
Wang, Chao-Yi, and 王昭懿. "The Study of Management for Physical Store Combing with Photo Kiosk." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/17701005773424324895.
Повний текст джерела大葉大學
工業工程與科技管理學系
96
When the government practices 2-days-off-per-week policy, Taiwanese have more time to plan their weekend trips. People are used to take pictures in tourist attractions to capture their happy memories. With the enhancement of digital technology, digital cameras almost replace traditional ones. Thus, digital media vary; digital photo outputs popularize; even photo-sharing devices increase. Besides, PC’s operation systems enhance digital cameras’ compatibility. It impacts traditional photo printing that digital cameras’ application is replacing traditional ones’. The research targeted at the strategic alliance of tourism and photography, which has significant relation. Combining Photo Kiosk and a fast-print digital printer can directly and quickly print out any digital content. We used questionnaire to investigate whether consumers accept digital Photo Kiosk. We also built a business model incorporating compound business with physical stores and considered the possibility of outsourcing strategic alliance. The research’s results are: 1.Through the questionnaire, we knew consumers’ habits of picture taking and photo printing. We analyzed their needs to provide Kiosk improvement marketing strategy. 2.After analyzed consumers’ needs, we understood that Photo Kiosk implementation is critical in tourism. 3.We scrutinized outsourcing strategic alliance of setting Photo Kiosk in tourist attractions all over Taiwan.
王華昌. "A study of the distributor management of digital photo frame SOC." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/72211358352752229426.
Повний текст джерела國立交通大學
管理學院碩士在職專班國際經貿組
96
A great event for the gift market is annual Christmas. Beside conventional gifts, there are many electronic gifts like celluar phones, digital cameras, portable DVD players, portable TVs… etc. Those are very important electronic gifts in recent years. Since 2006, the digital photo frame generally became the new one of popular electronic gifts. It’s no loyalty fee and forms a new application market for customer electronic industries. Besides of the industry design, TFT-LCD panel, electric board design is the most important issue of the digital photo frame system development. The features and prices of the digital photo frame SOC influence the system operations, functions and total BOM cost of digital photo frames. Digital photo frame SOC integrates hareware like JPEG, Motion JPEG decode of digital camera photographing, storage device interface (card reader, USB Host/Device, NOR/NAND Flash), 16/32 bit CPU, SDRAM control interface, TFT-LCD panel control unit, audio output unit…etc. It also integrates kernel, compact operation system, driver, middleware, and application as well as user interface design. Besides of integrating above technologies, digital photo frame SOC design house must do customers’ system design with its distributors. The SOC agents own many FAEs (Field Application Engineer) who understand IC spec and application well and could provide the demo system, reference circuit, PCB layout, reference code and do the total solution of electronic boards by customer request. Their sales keep good customer relationships with purchasers, research and development persons and key decision-makers to get the orders. The FAEs help customers’ projects develop and sales keep the relationship and do business and promotion over and over. The capability of the SOC distributors influences directly to its IC design company about 30 to 70 percent revenue. The customers of agents comprise middle and small size ones and are sources of higher profit of the IC design company. The SOC distributor management that involves the management subjects like technology, business, inspiration, conflict and strategy…etc is the main topic of this research.
"Integrated Distributed Power Management System for Photovoltaic." Doctoral diss., 2014. http://hdl.handle.net/2286/R.I.25861.
Повний текст джерелаDissertation/Thesis
Doctoral Dissertation Electrical Engineering 2014
Wu, Fuqu. "Visualizing things in construction photos: time, spatial coverage, and content for construction management." Thesis, 2009. http://hdl.handle.net/1828/1481.
Повний текст джерелаLin, Chia-Hung, and 林家弘. "Consumer Photo Management and Browsing Facilitated by Near-Duplicate Detection with Feature Filtering." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/09984787163988146626.
Повний текст джерела國立中正大學
資訊工程所
97
With the rapid growth of the number of digital photographs, people urgently demand systems that facilitate intelligent management and browsing. We specially focus on photos taken in travels. To conduct these issues, we present two primary objectives, i.e., representative selection and region-of-interest (ROI) determination. We propose a framework based on the techniques of near-duplicate detection to facilitate efficient photo management and browsing. To filter out false matches generated by feature points matching, we propose three feature filtering methods, including probability latent semantic analysis (PLSA) filtering, point-based filtering, and region-based filtering. For a given travel photo cluster, we model matching patterns by a support vector machine (SVM) classifier, which determinate whether two photos are near-duplicate pair or not. Relationships between near-duplicate photos are represented as a graph, and then the photo with the highest centrality value is selected as the representative photo in the given photo cluster. Because matched feature points are often located in the interior or at the contour of important objects, the region that compactly covers the matched feature points is determined as the ROI. In experimental results, we compare the performance of three feature classifiers, and confirm that filtering out noisy feature points is conducive to representative selection. We further apply the proposed framework to other interesting researches, such as image re-ranking.
Hua, Chengyun. "Exploring Thermal Phonon Transport from Atomic to Macroscopic Scales for Energy Conversion and Management." Thesis, 2016. https://thesis.library.caltech.edu/9832/84/main.pdf.
Повний текст джерелаHeat is one of the most fundamental forms of energy, and the ability to control heat plays a critical role in most current and future energy applications. Recently, interface engineering between heterogeneous solids has provided new approaches to manipulate heat transport at the scales of the energy carriers in solids, i.e. phonons which are quantized lattice vibrations. For example, nanocrystalline materials, which are polycrystalline materials with nanoscale grain sizes, are promising thermoelectric (TE) materials that have achieved substantially improved figure of merits compared to their bulk counterparts. This enhancement is typically attributed to a reduction in lattice thermal conductivity by phonon scattering at grain boundaries. On the other hand, inefficient heat dissipation across interfaces has been a long-standing problem that shortens the lifetime of electronics such as light-emitting diodes.
Despite the importance of interfaces, we still lack a comprehensive understanding of interfacial thermal phonon transport. For instance, the Fresnel coefficients enable the straightforward mathematical description of light as it moves between media of differing dielectric constants. Similarly, interfacial phonon transport can also be characterized by transmission coefficients that vary over the broad phonon spectrum in an analogous manner to Fresnel coefficients for light. However, despite decades of work, the spectral profile of these coefficients and how the profile is influenced by the atomic structure of actual interfaces remains unclear. As a result, the basic phenomenon of interfacial heat transport remains among the most poorly understood transport processes.
To elucidate this process, in this thesis we investigate interfacial thermal phonon transport using both modeling and experiment. The first portion of the thesis examines the impact of frequency-dependent grain boundary scattering in nanocrystalline silicon and silicon-germanium alloys using a novel computational method. We find that the grain boundary may not be as effective as commonly considered in scattering certain phonons, with a substantial amount of heat being carried by low frequency phonons with mean free paths longer than the grain size. Our result will help guide the design of more efficient TEs.
The second part of the thesis focuses on studying heat conduction using the Boltzmann transport equation (BTE), which is the governing equation of energy transport at length scales comparable to phonon mean free paths. The BTE is an integro-differential equation of time, real space, and phase space. Due to its high dimensionality, it is extremely challenging to solve. Here, we develop analytical methods to solve the frequency-dependent BTE, which allow us to obtain simple, closed-form solutions to complex multidimensional problems that have previously been possible to solve only with computationally expensive numerical simulations. We demonstrate that the solution leads to a more accurate measurement of phonon MFP spectra in thermal transient grating experiments.
Finally, we report the first measurements of thermal phonon transmission coefficients at a metal-semiconductor interface using ab-initio phonon transport modeling based on the BTE we develop in the second part and a thermal characterization technique, time-domain thermoreflectance. With our approach, we are able to directly link the atomic structure of an interface to the spectral content of the heat crossing it for the first time. Our work realizes the long-standing goal of directly measuring thermal phonon transmission coefficients and demonstrates a general route to study microscopic processes governing interfacial heat conduction.