Since the beginnings of the semiconductor revolution, device engineering and material development have been deeply interconnected. Innovations in one invariably spurred development in the other. One of the most important current challenges are developing techniques which enable deposition of materials on arbitrary substrates and the design constraints of devices fabricated via these techniques. This thesis focuses on furthering the materials development-device design cycle for three techniques: (i) epitaxial lift-off, (ii) nanowire growth via the vapor-liquid-solid growth mode, and (iii) the thin-film vapor-liquid-solid growth technique. The physics of devices made via (i) and (ii) are discussed in chapters two and three, the material science of (iii) is discussed in chapter four, and a method to engineer the physical and electronic properties of individual nanowires made via (ii) is discussed in chapter two deals with the device physics and performance of ultra-thin compound semiconductor on insulator field effect transistors. Due to its excellent electron transport properties, InAs is used as the material of choice for the transistors, termed XOI FETs. These devices are fabricated utilizing an epitaxial layer transfer technique, enabling highly lattice mismatched single-crystalline layers of InAs to be deposited on Si wafers. Allowing devices which combine the excellent transport properties of compound-semiconductors and the established processing infrastructure for silicon. Chapter three discusses the design constraints and guidelines for nanopillar photovoltaics, specifically those fabricated utilizing the CdS/CdTe material system. Critically, the materials parameters that are favorable to non-planar cells are discussed, and the performance expectations for CdS/CdTe nanopillar photovoltaics are discussed.

关键词：器件物理；材料科学；技术发展

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In 1965 Klyuev and Kokovkin-Shcherbak proved that that n^3/3n3+O(n^2)multiplications are necessary to solve an n-by-n system of linear equations. In 1969 Strassen proved O(n^(log2 7)) multiplications are sucient. They could both be right because they considered di erent models of permitted algorithms. Here we propose yet another algorithmic model, closer in spirit to Klyuev and Kokovkin-Shcherbak, but suciently more general to be able to provide lower bounds on the number of arithmetic operations required to perform dense, sparse or \structured" one-sided matrix factorizations: The simplest (and overly restrictive) version of our assumption is that each scalar result is computed using only the data on which it depends mathematically. We compare these lower bounds with a variety of algorithms and matrix sparsity patterns and algebraic structures (such as Vandermonde). Depending on the sparsity patterns and structures, conventional algorithms may or may not attain the lower bounds. In some cases when they do not, we present new algorithms that do. These bounds are based on a simple, general lower bound for the arithmetic complexity of computing rational functions.

关键词：算法模型；代数结构；算数运算；

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We describe and analyze a novel symmetric triangular factorization algorithm. The algorithm is essentially a block version of Aasen’s triangular tridiagonalization. It factors a dense symmetric matrix A as the product A = PLTLTPT where P is a permutation matrix, L is lower triangular, and T is block tridiagonal and banded. The algorithm is the first symmetric-indefinite communication-avoiding factorization: it performs an asymptotically optimal amount of communication in a two-level memory hierarchy for almost any cache-line size. Adaptations of the algorithm to parallel computers are likely to be communication efficient as well; one such adaptation has been recently published. The current paper describes the algorithm, proves that it is numerically stable, and proves that it is communication optimal.

关键词：三角分解算法；对称不定分解；通信量；最佳通信

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The last decade has witnessed a tremendous growth in wireless communications. Consumer demands for battery-operated mobile devices with versatile, high data-rate communication capabilities that are of low cost, small form-factor and long operating cycle have motivated the research on fully-integrated, back-o -effcient and coexistence-friendly wireless transceivers in CMOS VLSI technology. However, the full integration of an ecient CMOS power ampli er (PA) into such a transceiver is still among the most difficult challenges towards a true System-On-Chip (SOC) solution. This thesis investigates the PA eciency enhancement techniques for a complete power transmitter system that is fully-integrated and coexistable.

关键词：数字调制发射机；无线通信；增强效率

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Gesture recognition allows users to interact with their electronic devices in a manner that mimics their interaction with the physical world, thus making devices easier to use for all users. Interacting with the software, using gesture and body motion is definitely a cool ideal. However, designing effective interactions is a challenge on a gesture-controlled application.We partnered with the Microsoft Windows Phone Team to develop a Kinect physiotherapy application. This application enables the patients to perform recovery exercises remotely at home. It checks the patient’s body movements against doctors’ instructions and provides real-time instructions to the patients.

关键词：用户界面；手势识别；技术；网络交互软件

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Because of the emerging trend of mobile, developing applications on smartphone platform gathers more and more people’s interests. Our capstone project is to build a mobile application on the Android platform that generates a house floor plan overlaid with Wi-Fi strength map. Right now in the market, there are plenty of mobile apps about measuring the floor plan or the WiFi signal strength, but there has not been an app that combines those two features. Since Wi-Fi is becoming the de facto standard for in-home wireless connectivity between devices inside the home, our industry partner, Qualcomm, thought this could be a great feature to be added to thefloor plan app. We divided the whole product into two parts. One is the house floor plan, the other is the WiFi signal strength map. We finished those two separately then assembled them together. The whole developing process includes the selection of the main algorithms for the floor plan measurement and the WiFi signal strength, graphical user interface design as well as some marketing research. Finally we achieved that the error of the measurement result given by our application is within 10%. After the measurement process, the user can get the desired floorplan with the WiFi signal strength map

关键词：智能应用程序；WIFI覆盖平面图；无线连接；

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In this project we examine the possibilities of bringing the gesture recognition to Windows Phone and Surface tablet devices by integrating Kinect to the aforementioned devices. We will demonstrate this by designing a physiotherapy application.In physiotherapy exercises, it is very important and critical to the patient to do the exercises as accurately as possible. So our physiotherapy application should have the ability to give feedback to the users in order for them to do the exercises correctly. For this purpose, we decided to render 3D arrows that show users how to adjust incorrectly positioned limbs.

关键词：手势识别；理疗应用程序；3D反馈

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A Massive Open Online Course (MOOC) is a large-scale web-based course that is offered to a very large number of participants. In the last few years, MOOCs have seen an increase in popularity due to the emergence of several well-designed online-education websites, such as edX and Coursera, and rising interest from top universities, such as MIT, Stanford and UC Berkeley, to open a variety of their courses to the wider public. The appeal for end consumers lies in the accessibility of high-quality education from any location regardless of personal background. MOOCs typically contain short lecture videos (10-15 minutes), as well as quizzes and homework assignments to assess students’ understanding of subject matter.

关键词：隐马尔科夫模型；预测；学生保留；

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Timing analysis is central to the design and implementation of cyber-physical systems. This thesis presents GameTime, a timing analysis toolkit that is based on a combination of game-theoretic online learning and systematic testing using satis ability modulo theories (SMT) solvers. GameTime can be used to tackle a range of problems related to program timing, including estimating the worst-case execution time, predicting the distribution of execution times, and detecting timing-related anomalies.This thesis describes the details of the implementation of GameTime. The notion of basis paths is used to handle the exponentially many paths in a program. The issues that arise during the translation of statements in C programs to the equivalent clauses in SMT queries are presented, and the techniques used by GameTime to address these issues are elaborated through examples. Finally, experimental results demonstrate the speed of GameTime analysis and the accuracy of the predictions made by GameTime, with a relative error margin of less than 5% on most of the benchmarks measured.

关键词：时序分析；基准路径；内部实施和评估

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公司传统上以电子文档影像业务、电子商务和信息安全三大软件产品创业，随后在金融IT遇到瓶颈时开拓环保领域，并逐步确立了金融IT与环保科技业务并举的战略。公司作为金融软件提供商，以金融行业IT设作为自己的主营业务发展方向，形成软硬件和IT服务综合的银行IT 解决方案提供商。

关键词：金融IT；软件业务；硬件设备；支付器

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