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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Light emitting diodes based on n-type ZnO nanorods and p-type organic semiconductors

Sellappan, Raja January 2008 (has links)
The aim of this thesis work was to fabricate a hybrid LED using organic-inorganic ZnO materials. The goal of the project was to get an efficient white light emission from zinc oxide (ZnO) nanorods active layer. Since most of the organic materials are good for hole mobility and most of the inorganic materials are good for electron mobility, it is possible to fabricate a high performance heterostructure electroluminescence device from organic-inorganic materials. This thesis work was an attempt towards fabricating such a high electroluminescence LED from hybrid materials in which polymer acts as a p-type material and ZnO acts as a n-type material. The growth mechanism of ZnO nanorods using low-temperature aqueous solution method has been studied and nanorods (NRs) growth was examined with scanning electron microscope (SEM). Optimum hole injection polymers have been studied. Finally, the fabricated device was characterized using parameter analyzer. The fabricated device worked as a diode i.e. it rectified current as expected and the desirable light emission has almost been achieved.
2

Light emitting diodes based on n-type ZnO nanorods and p-type organic semiconductors

Sellappan, Raja January 2008 (has links)
<p>The aim of this thesis work was to fabricate a hybrid LED using organic-inorganic ZnO materials. The goal of the project was to get an efficient white light emission from zinc oxide (ZnO) nanorods active layer. Since most of the organic materials are good for hole mobility and most of the inorganic materials are good for electron mobility, it is possible to fabricate a high performance heterostructure electroluminescence device from organic-inorganic materials. This thesis work was an attempt towards fabricating such a high electroluminescence LED from hybrid materials in which polymer acts as a p-type material and ZnO acts as a n-type material. The growth mechanism of ZnO nanorods using low-temperature aqueous solution method has been studied and nanorods (NRs) growth was examined with scanning electron microscope (SEM). Optimum hole injection polymers have been studied. Finally, the fabricated device was characterized using parameter analyzer. The fabricated device worked as a diode i.e. it rectified current as expected and the desirable light emission has almost been achieved.</p>
3

Organic-Inorganic Hetero Junction White Light Emitting Diode : N-type ZnO and P-type conjugated polymer

Lubuna Beegum, Shafeek January 2008 (has links)
The purpose of this thesis work is to design and fabricates organic-inorganic hetero junction White Light Emitting Diode (WLED). In this WLED, inorganic material is n- type ZnO and organic material is p-type conjugated polymer. The first task was to synthesise vertically aligned ZnO nano-rods on glass as well as on plastic substrates using aqueous chemical growth method at a low temperature. The second task was to find out the proper p- type organic material that gives cheap and high efficient WLED operation. The proposed polymer shouldn’t create a high barrier potential across the interface and also it should block electrons entering into the polymer. To optimize the efficiency of WLED; charge injection, charge transport and charge recombination must be considered. The hetero junction organic-inorganic structures have to be engineered very carefully in order to obtain the desired light emission. The layered structure is composed of p-polymer/n-ZnO and the recombination has been desired to occur at the ZnO layer in order to obtain white light emission. Electrical characterization of the devices was carried out to test the rectifying properties of the hetero junction diodes. iv
4

Comparison Research of Taiwan Adolescent Subculture Consumer Groups: Empirical Studies of Otaku and Pop Music Fans

Chiang, Yung-Sung 11 January 2012 (has links)
High accessibility to internet technology and popularization of focus media has given rise to various emerging subcultures among the younger generation who constantly seek novelty and unique lifestyles. The Otaku subculture is one such adolescent subculture, a culture of avid ACG (animation, comic, games) collectors, while pop music fans belong to another youth subculture deeply involved in gathering and tracking the lives and performances of pop music stars. As the adolescent is becoming the most purchasing power consumer group of fashion product, this research aims at comparing the traits of the above two adolescent subcultures and their influences on buying behavior tendencies toward subculture-specific merchandises. This research is also attempting to develop an analytical model through comparison of two studies. The research framework is constructed based on the assumption that the traits of adolescent subcultures influence the subculture-specific consumptions and is examined on two studies of Otaku and pop music fans subcultures respectively. The same investigation methods are applied in two studies. First, the review of prior studies and findings of focus group interview with sample of five representative adolescents were integrated into a tentative model. Then, the questionnaire was developed based on the tentative model and the focus group interview findings, and sample of survey in two studies are 105 and 101 respectively. Survey data were examined by factor analysis and structural equation modeling for the verification of the tentative model, and finally a revised model is developed based on comparison of two studies results. Results show that the personality, values and lifestyle of subculture¡¦s main traits dimensions influence their buying behavior, although the Otaku and pop music fans take part in different activities and embrace different personality traits and values. The results also verify a feasible generalized analytical model for measuring the influences of the traits of specific adolescent subcultures on their buying behavior. This research offers some implications for consumer behavior and marketing communication including (1) comprehensive customer investigation is needed to understand what adolescents think and want; (2) providing attractive content and (3) adopting modern media to attract and access adolescent subculture group; (4) marketing communication appeals should match adolescents self-images to get their identification; and (5) providing total subculture solution in integrated marketing programs.
5

Organic-Inorganic Hetero Junction White Light Emitting Diode : N-type ZnO and P-type conjugated polymer

Lubuna Beegum, Shafeek January 2008 (has links)
<p>The purpose of this thesis work is to design and fabricates organic-inorganic hetero junction White Light Emitting Diode (WLED). In this WLED, inorganic material is n- type ZnO and organic material is p-type conjugated polymer. The first task was to synthesise vertically aligned ZnO nano-rods on glass as well as on plastic substrates using aqueous chemical growth method at a low temperature. The second task was to find out the proper p- type organic material that gives cheap and high efficient WLED operation. The proposed polymer shouldn’t create a high barrier potential across the interface and also it should block electrons entering into the polymer. To optimize the efficiency of WLED; charge injection, charge transport and charge recombination must be considered. The hetero junction organic-inorganic structures have to be engineered very carefully in order to obtain the desired light emission. The layered structure is composed of p-polymer/n-ZnO and the recombination has been desired to occur at the ZnO layer in order to obtain white light emission. Electrical characterization of the devices was carried out to test the rectifying properties of the hetero junction diodes.</p><p>iv</p>
6

Policy, Governance and Local Institutions for Biodiversity Conservation in Costa Rica

Basurto, Xavier January 2007 (has links)
The goal of this dissertation is to advance the theory of common-pool resources in three different but interrelated ways: (1) Common-pool resources theory has identified a number of factors that play an important role on human groups' ability to engage in successful institutional change. However it is still not clear which are their causal relationships on specific contexts. This study looks at the relationship between two of the aforementioned factors: local leadership and local autonomy. It does so in the context of the decentralization of the governance of protected areas for biodiversity conservation in Costa Rica. (2) Historically, common-pool resources theory has paid limited attention to the interactions between local institutions and higher levels of governance. This study incorporates the analysis of cross-scale institutional linkages into the assessment of decentralization reforms in Costa Rica. (3) To do so it incorporates an analytical approach that allows for systematic and rigorous comparisons of small-to-moderate-sized Ns and is apt at handling multiple-causality outcomes. Looking at these issues in the context of the decentralization of biodiversity governance in Costa Rica is relevant because it is the most biodiverse country per unit of area in the world, and during the last twenty years has experimented with decentralization policies to create locally-based institutions for biodiversity conservation. Among my most relevant findings are: (1) that the presence of local leadership is positively related to institutions ability to gain local autonomy from the central government. (2) However, in the context of a class-based society with a strong urban-rural divide, the emergence of local leadership for conservation in rural settings is likely not able to take place by itself without support from within the bureaucratic structure. (3) More diverse are better than less diverse sets of cross-scale linkages in local institutions' ability to gain and maintain local autonomy overtime. (4) Local autonomy can help local institutions increase their potential for biodiversity conservation as long as there are well-defined institutional arrangements in place. Otherwise, local institutions might find themselves pursuing other agendas that might have an unclear relation with biodiversity conservation.
7

ASIC implemented MicroBlaze-based Coprocessor for Data Stream Management Systems

LINKNATH SURYA BALASUBRAMANIAN (8781929) 04 May 2020 (has links)
The drastic increase in Internet usage demands the need for processing data in real time with higher efficiency than ever before. Symbiote Coprocessor Unit (SCU), developed by Dr. Pranav Vaidya, is a hardware accelerator which has potential of providing data processing speedup of up to 150x compared with traditional data stream processors. However, SCU implementation is very complex, fixed, and uses an outdated host interface, which limits future improvement. Mr. Tareq S. Alqaisi, an MSECE graduate from IUPUI worked on curbing these limitations. In his architecture, he used a Xilinx MicroBlaze microcontroller to reduce the complexity of SCU along with few other modifications. The objective of this study is to make SCU suitable for mass production while reducing its power consumption and delay. To accomplish this, the execution unit of SCU has been implemented in application specific integrated circuit and modules such as ACG/OCG, sequential comparator, and D-word multiplier/divider are integrated into the design. Furthermore, techniques such as operand isolation, buffer insertion, cell swapping, and cell resizing are also integrated into the system. As a result, the new design attains 67.9435 µW<p></p> of dynamic power as compared to 74.0012 µW<p></p> before power optimization along with a small increase in static power, 39.47 ns of clock period as opposed to 52.26 ns before time optimization.
8

Avvikelser i primärvårdens diagnoskodsregistrering : En studie om diagnosregistreringsmönster och förslag på förbättringsåtgärder – vårdcentralen Bra liv i Nässjö

Svärd, Sanna, Sundström, Jenhwyfar, Holmin, Lennart January 2022 (has links)
Denna studie har gjorts med syftet att uppmärksamma avvikelser mellan journalanteckningar­nas innehåll och diagnoskodsregistreringen på vårdcentralen Bra liv i Nässjö. Genom att granska 100 journalanteckningar, både mottagningsbesök och distanskontakter har avvikelser i diagnoskodsregistreringen kunnat identifieras. Efter 66 granskade anteckningar gjordes en del­avstämning, för att senare kunna göra en jämförelse med slutresultatet och på så sätt tolka om mönster förekommer eller inte. Avvikelserna har delats in i tre olika kategorier, över-, under- och felkodning för att få en tydligare bild av vilka typer av avvikelser som förekommer. Granskningens resultat och kategoriseringen av avvikelserna har resulterat i två tabeller som tydligt visar avvikelsemönster, både i antal och procent. Studiens resultat visar att 30 % av alla granskade journalanteckningar innehöll avvikelser. Distanskontakterna innehöll 22,5 % avvi­kelser och mottagningsbesöken innehöll 35 % avvikelser. Den mest förekommande avvikelsen var felkodning, som uppnådde 11 % avvikelser totalt. Andra avvikelser har också kunnat konstaterats, så som språkliga fel, användande av förkort­ningar som inte är vedertagna, förekomst av frågetecken i slutsignerade journalanteckningar samt inkonsekvent användning av Z- och åtgärdskoder. Resultatet stämmer inte överens med det förväntade resultatet, vilket är att Socialstyrelsens och Bra livs riktlinjer ska följas. Slutsat­sen är att tidigare studier kring ämnet stämmer överens med den här studiens resultat och att det finns tydliga brister i den nuvarande diagnoskodningen och dess registrering. Det krävs förbättringsåtgärder som leder mot ett enhetligt arbetssätt kring journalanteckningarnas dia­gnos- och åtgärdskodning och registrering. Vi har utifrån studiens resultat och uppvisade behov av förbättring tagit fram förslag till förbättringsåtgärder vilket vi har kunnat presentera i denna rapport. / This study has been done with the purpose of recognizing inconsistencies between the content of medical record notes and registration of codes at the health center Bra liv in Nässjö. After reviewing 100 medical record notes, including reception visits and remote contacts, deviations in the registration of codes have been identified. After 66 reviewed medical record notes, a partial reconciliation was made, which could later be used to make a comparison with the final result in order to see if there was a pattern or not in the deviations. The inconsistencies have been divided into three different categories, over- and undercoding and coding errors to get a clearer picture of which kinds of deviations that occurs. The results of the journal review and the categorization of the deviations have resulted in two tables that shows deviation patterns in quantity and percentage. The result of the study shows that 30 % of all reviewed medical record notes had deviations. The remote contacts had 22.5 % deviations and the reception visits had 35 % deviations. The most common deviation was coding errors, which represented 11 % of the deviations altogether. Other deviations have also been found during the journal review, such as linguistic errors, the use of non-permissible abbreviation, the presence of question marks in signed medical record notes and a inconsistent use of other codes. The outcome of this study does not match the expected result, that the National Board of Health and Welfare's and Bra Liv’s guidelines should have been applied by the employees at the health center. The conclusion is that previous studies in the field are consistent with the outcome of this study, which also shows inconsistencies in the medial record notes. Improvements are required to get a consistent way of working related to the use of codes in the medical record notes. Based on the results of this study and the health center’s need of improvement, we have developed suggestions for improvements which are presented in this study. / <p>Examen i vårdadministration, YH-utbildning: 20 Yh-poäng</p>
9

ASIC implemented MicroBlaze-based Coprocessor for Data Stream Management Systems

Balasubramanian, Linknath Surya 05 1900 (has links)
Indiana University-Purdue University Indianapolis (IUPUI) / The drastic increase in Internet usage demands the need for processing data in real time with higher efficiency than ever before. Symbiote Coprocessor Unit (SCU), developed by Dr. Pranav Vaidya, is a hardware accelerator which has potential of providing data processing speedup of up to 150x compared with traditional data stream processors. However, SCU implementation is very complex, fixed, and uses an outdated host interface, which limits future improvement. Mr. Tareq S. Alqaisi, an MSECE graduate from IUPUI worked on curbing these limitations. In his architecture, he used a Xilinx MicroBlaze microcontroller to reduce the complexity of SCU along with few other modifications. The objective of this study is to make SCU suitable for mass production while reducing its power consumption and delay. To accomplish this, the execution unit of SCU has been implemented in application specific integrated circuit and modules such as ACG/OCG, sequential comparator, and D-word multiplier/divider are integrated into the design. Furthermore, techniques such as operand isolation, buffer insertion, cell swapping, and cell resizing are also integrated into the system. As a result, the new design attains 67.9435 µW of dynamic power as compared to 74.0012 µW before power optimization along with a small increase in static power, 39.47 ns of clock period as opposed to 52.26 ns before time optimization.
10

Hardware Synthesis of Synchronous Data Flow Models

Koecher, Matthew R. 06 April 2004 (has links) (PDF)
Synchronous Dataflow (SDF) graphs are a convenient way to represent many signal processing and dataflow operations. Nodes within SDF graphs represent computation while arcs represent dependencies between nodes. Using a graph representation, SDF graphs formally specify a dataflow algorithm without any assumptions on the final implementation. This allows an SDF model to be synthesized into a variety of implementation techniques including both software and hardware. This thesis presents a technique for generating an abstract hardware representation from SDF models. The techniques presented here operate on SDF models defined structurally within the Ptolemy modeling environment. The behavior of the nodes within Ptolemy SDF models is specified in software and can be simple, such as a single arithmetic operation, or arbitrarily complex. This thesis presents a technique for extracting the behavior of a limited class of SDF nodes defined in software and generating a structural description of the SDF model based on primitive arithmetic and logical operations. This synthesized graph can be used for subsequent hardware synthesis transformations.

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