Matching Items (22)

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Crystal Orientation Dependent Intersubband Transition in Semipolar AlGaN/GaN Single Quantum Well for Optoelectronic Applications

Description

The optical properties of intersubband transition in a semipolar AlGaN/GaN single quantum well (SQW) are theoretically studied, and the results are compared with polar c-plane and nonpolar m-plane structures. The intersubband transition frequency, dipole matrix elements, and absorption spectra are

The optical properties of intersubband transition in a semipolar AlGaN/GaN single quantum well (SQW) are theoretically studied, and the results are compared with polar c-plane and nonpolar m-plane structures. The intersubband transition frequency, dipole matrix elements, and absorption spectra are calculated for SQW on different semipolar planes. It is found that SQW on a certain group of semipolar planes (55° < θ < 90° tilted from c-plane) exhibits low transition frequency and long wavelength response with high absorption quantum efficiency, which is attributed to the weak polarization-related effects. Furthermore, these semipolar SQWs show tunable transition frequency and absorption wavelength with different quantum well thicknesses, and stable device performance can be achieved with changing barrier thickness and Al compositions. All the results indicate that the semipolar AlGaN/GaN quantum wells are promising candidate for the design and fabrication of high performance low frequency and long wavelength optoelectronic devices.

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Date Created
2016-05-05

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Analysis of Loss Mechanisms in InGaN Solar Cells Using a Semi-Analytical Model

Description

InGaN semiconductors are promising candidates for high-efficiency next-generation thin film solar cells. In this work, we study the photovoltaic performance of single-junction and two-junction InGaN solar cells using a semi-analytical model. We analyze the major loss mechanisms in InGaN solar

InGaN semiconductors are promising candidates for high-efficiency next-generation thin film solar cells. In this work, we study the photovoltaic performance of single-junction and two-junction InGaN solar cells using a semi-analytical model. We analyze the major loss mechanisms in InGaN solar cell including transmission loss, thermalization loss, spatial relaxation loss, and recombination loss. We find that transmission loss plays a major role for InGaN solar cells due to the large bandgaps of III-nitride materials. Among the recombination losses, Shockley-Read-Hall recombination loss is the dominant process. Compared to other III-V photovoltaic materials, we discovered that the emittance of InGaN solar cells is strongly impacted by Urbach tail energy. For two- and multi-junction InGaN solar cells, we discover that the current matching condition results in a limited range of top-junction bandgaps. This theoretical work provides detailed guidance for the design of high-performance InGaN solar cells.

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Date Created
2016-06-01

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High-modulation-speed LEDs based on III-nitride

Description

III-nitride InGaN light-emitting diodes (LEDs) enable wide range of applications in solid-state lighting, full-color displays, and high-speed visible-light communication. Conventional InGaN quantum well LEDs grown on polar c-plane substrate suffer from quantum confined Stark effect due to the large internal

III-nitride InGaN light-emitting diodes (LEDs) enable wide range of applications in solid-state lighting, full-color displays, and high-speed visible-light communication. Conventional InGaN quantum well LEDs grown on polar c-plane substrate suffer from quantum confined Stark effect due to the large internal polarization-related fields, leading to a reduced radiative recombination rate and device efficiency, which limits the performance of InGaN LEDs in high-speed communication applications. To circumvent these negative effects, non-trivial-cavity designs such as flip-chip LEDs, metallic grating coated LEDs are proposed. This oral defense will show the works on the high-modulation-speed LEDs from basic ideas to applications. Fundamental principles such as rate equations for LEDs/laser diodes (LDs), plasmonic effects, Purcell effects will be briefly introduced. For applications, the modal properties of flip-chip LEDs are solved by implementing finite difference method in order to study the modulation response. The emission properties of highly polarized InGaN LEDs coated by metallic gratings are also investigated by finite difference time domain method.

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Date Created
2016

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A Case Study of Executive Stock Compensation Design for The State-Owned Firms

Description

Executive compensation design involving equity shares has been widely used in Europe, the United States and other developed countries where the capital markets are relatively mature. In China, due to the differences in industries, ownership structure, stages of enterprise development,

Executive compensation design involving equity shares has been widely used in Europe, the United States and other developed countries where the capital markets are relatively mature. In China, due to the differences in industries, ownership structure, stages of enterprise development, constraints faced by the firms, the executive compensation design using equity shares tends to vary accordingly. For the state-owned companies, the situations are more complex than others. This complexity has not been a focus of the past literature, particularly on the compensation contract design and its subsequent implementation. Based on Coase contract theorem, agency theory and human capital theory, I examined how different state-owned firms vary in their approaches on managerial stock compensation design using a case study approach. The thesis concludes with a summary of major findings and a discussion of policy implications.

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Date Created
2016

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The Impacts on Corporate Performance of the Banking Industry’s Compensation & Incentive Policy

Description

Ever since the registration of private banks was deregulated in Taiwan in 1991, the sector has suffered significant decline in profitability. Facing such a dynamic sector yet vital to domestic economy, what should the banks do to successfully improve their

Ever since the registration of private banks was deregulated in Taiwan in 1991, the sector has suffered significant decline in profitability. Facing such a dynamic sector yet vital to domestic economy, what should the banks do to successfully improve their competiveness? As external changes are often unpredictable, the exploration and buildup of internal resources is a critical approach. This article focuses on how to effectively manage internal competition so as to upgrade business performance and accomplish organizational goals.

This article discusses the effects of the compensation system and employee incentives on business performance in banking in two areas. First of all, based on the statistics on the banking sector in Taiwan, it explores the regulating effects of different compensation systems on two conflicts in the industry. It also reviews the literature on Conflict Theory. Research shows that when people trust each other, they tend to accept a value statement different from theirs. And our research also shows that trust can minimize task conflict and relationship conflict between team members. Moreover, after identifying the role of compensation structure to trust and task conflict, this article further categorizes the structure into team performance reward and individual performance reward. Analysis points out that when the organization bases compensation payment on team performance reward, the relationship between trust and task conflict is higher than that on individual performance reward. That is, team performance reward better helps to reinforce such correlation compared to individual performance reward.

Second, the research studies different forms of employee incentives in Taiwan’s banking sector as well as resulting performance. During the studied period, the majority of the financial institutions preferred cash bonus. In addition, financial institutions also take other incentives. Cash bonus covered the highest percentage, followed by share bonus, treasury repo and transfer, and options in order. We study the ROEs under different incentives and conclude it is higher and more stable in the institutions offering multiple employee shares instead of single method. Whether the incentives are implemented also influence the level of net ROE.

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Date Created
2016

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Research on Factors Influencing Individual’s Behavior of Energy Management

Description

With the rapid rise of distributed generation, Internet of Things, and mobile Internet, both U.S. and European smart home manufacturers have developed energy management solutions for individual usage. These applications help people manage their energy consumption more efficiently. Domestic manufacturers

With the rapid rise of distributed generation, Internet of Things, and mobile Internet, both U.S. and European smart home manufacturers have developed energy management solutions for individual usage. These applications help people manage their energy consumption more efficiently. Domestic manufacturers have also launched similar products.

This paper focuses on the factors influencing Energy Management Behaviour (EMB) at the individual level. By reviewing academic literature, conducting surveys in Beijing, Shanghai and Guangzhou, the author builds an integrated behavioural energy management model of the Chinese energy consumers. This paper takes the vague term of EMB and redefines it as a function of two separate behavioural concepts: Energy Management Intention (EMI), and the traditional Energy Saving Intention (ESI).

Secondly, the author conducts statistical analyses on these two behavioural concepts. EMI is the main driver behind an individual’s EMB. EMI is affected by Behavioural Attitudes, Subjective Norms, and Perceived Behavioural Control (PBC). Among these three key factors, PBC exerts the strongest influence. This implies that the promotion of the energy management concept is mainly driven by good application user experience (UX). The traditional ESI also demonstrates positive influence on EMB, but its impact is weaker than the impacts arising under EMI’s three factors. In other words, the government and manufacturers may not be able to change an individual's energy management behaviour if they rely solely on their traditional promotion strategies. In addition, the study finds that the government may achieve better promotional results by launching subsidies to the manufacturers of these kinds of applications and smart appliances.

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Date Created
2016

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A Comparative Study of Market and Non-market Mechanism In State-owned Enterprises Management

Description

State-owned Enterprises (SOE) in China were described as Government Business Enterprises (GBE) in planned economy time. Not only as investor and owner, but also manager, government at that time was an all-powerful role in GBE. All factors of production, such

State-owned Enterprises (SOE) in China were described as Government Business Enterprises (GBE) in planned economy time. Not only as investor and owner, but also manager, government at that time was an all-powerful role in GBE. All factors of production, such as money, raw materials, production, sell, human affairs, were all decided by administrative orders. After reform and opening up, especially since 90s of last century, some related laws, including The Companies Act, were gradually promulgated and carried out, State-owned Enterprises have been found fairly like modern enterprises in appearance, but observe carefully, you will find that with the growing up of the market mechanism, Non-market mechanism still exists stubbornly during the whole company's actual operation.

This study focus on two cases of State-owned Enterprises, which are administrated by myself. Trying to find out the difference in business efficiency and group cohesiveness, this study examines the effects of the market mechanism and non-market mechanism, which are respectively operated as a pivotal figure in the two companies. Under the background of the social transformation and State-owned Enterprises’ deepen reform, for stimulating the vitality and efficiency of companies, this study tries to find an optimization management model for State-owned Enterprises.

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Date Created
2015

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Study on China's Capital Market Segmentation under Fragmented Regulations

Description

The Chinese capital market is characterized by high segmentation due to governmental regulations. In this thesis I investigate both the causes and consequences of this market segmentations. Specifically, I address the following questions: (1) to which degree this capital market

The Chinese capital market is characterized by high segmentation due to governmental regulations. In this thesis I investigate both the causes and consequences of this market segmentations. Specifically, I address the following questions: (1) to which degree this capital market segmentation is caused by the fragmented regulations in China, (2) what are the key characteristics of this market segmentation, and (3) what are the impacts of this market segmentation on capital costs and resources allocations. Answers to these questions can have important implications for Chinese policy makers to improve capital market regulatory coordination and efficiency. I organize this thesis as follows. First, I define the concepts of capital market segmentation and fragmented regulation based on literature reviews and theoretical analysis. Next, on the basis of existing theories and methods in finance and economics, I select a number of indicators to systematically measure the degree of regulatory segmentation in China’s capital market. I then develop an econometric model of capital market frontier efficiency analysis to calculate and analyze China’s capital market segmentation and regulatory fragmentation. Lastly, I use the production function analysis technique and the even study method to examine the impacts of fragmented regulatory segmentation on the connections and price distortions in the equity, debt, and insurance markets. Findings of this thesis enhance the understanding of how institutional forces such as governmental regulations influence the function and efficiency of the capital markets.

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Date Created
2015

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A Model Framework to Estimate the Fraud Probability of Acquiring Merchants

Description

Using historical data from the third-party payment acquiring industry, I develop a statistical model to predict the probability of fraudulent transactions by the merchants. The model consists of two levels of analysis – the first focuses on fraud detection at

Using historical data from the third-party payment acquiring industry, I develop a statistical model to predict the probability of fraudulent transactions by the merchants. The model consists of two levels of analysis – the first focuses on fraud detection at the store level, and the second focuses on fraud detection at the merchant level by aggregating store level data to the merchant level for merchants with multiple stores. My purpose is to put the model into business operations, helping to identify fraudulent merchants at the time of transactions and thus mitigate the risk exposure of the payment acquiring businesses. The model developed in this study is distinct from existing fraud detection models in three important aspects. First, it predicts the probability of fraud at the merchant level, as opposed to at the transaction level or by the cardholders. Second, it is developed by applying machine learning algorithms and logistical regressions to all the transaction level and merchant level variables collected from real business operations, rather than relying on the experiences and analytical abilities of business experts as in the development of traditional expert systems. Third, instead of using a small sample, I develop and test the model using a huge sample that consists of over 600,000 merchants and 10 million transactions per month. I conclude this study with a discussion of the model’s possible applications in practice as well as its implications for future research.

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Date Created
2015

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An Empirical Study on the Growth of Small and Medium-Sized Pharmaceutical Enterprises through M&A in China

Description

This thesis starts with an analysis of the current situation of the pharmaceutical industry in China, and discusses the strategic mergers and acquisitions (M&A) by small and medium-sized enterprises (SMEs) in the pharmaceutical industry in China. It elaborates on the

This thesis starts with an analysis of the current situation of the pharmaceutical industry in China, and discusses the strategic mergers and acquisitions (M&A) by small and medium-sized enterprises (SMEs) in the pharmaceutical industry in China. It elaborates on the rationale for the development of the mergers and acquisitions of the pharmaceutical SMEs. Then a literature review is provided on the causes of corporate mergers and acquisitions such as the economies of scale, synergistic effect, transaction costs, market power, and strategic diversification.Next,the thesis analyzes the underlying rationale for the M&A transactions in the pharmaceutical industry in China, and explores the likely path of successful value creation for pharmaceutical SMEs in China. Specifically, with five in-depth case studies of M&A transactions of pharmaceutical firms, this thesis reveals the critical success factors leading to value creation and growth in the practice of mergers and acquisitions of the pharmaceutical SMEs in China.

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Date Created
2015