[文书写作] PS:Ph.D. in Electrical and Computer Engineering [复制链接]

Zephyr2000
UID：97473

寄托新兵

Rank: 2

声望: 0
寄托币: 282
注册时间: 2000-10-29
精华: 1
帖子: 0

电梯直达

楼主

发表于 2001-11-1 08:06:42 |只看该作者 |倒序浏览

STATEMENT OF PURPOSE

Applicant: (Name of Student)
Proposed Department & Degree: Ph.D. in Electrical and Computer Engineering
Semester and year applying for: fall 2001 as an international student

Introduction

The theory that two basic components of communications, source coding and channel coding, can be performed independently with no performance degradations relative to joint design is the separation principle of Claude E. Shannon, the father of the modern communication theory. I can demonstrate that Shannon's theory is no longer true on the ground of two experiments, one related to my research for a course term project and the other to my MS thesis. First, our inchoate system for multimedia transport over the Internet exhibits that an optimal source coding designed independently on channel condition could be vulnerable to channel impairment. Second, the system that I designed for my MS thesis, however, shows great robustness to channel error, which is designed considering the Internet packet loss. I can claim that to jointly design source and channel coding must be the ultimate solution for the communication over the Internet and wireless channel.

Motivations

Dialpad.com started a free Internet telephone service using the international standard H.323 in 1999.  I was motivated by a merging of voice communications into data networks, as found in the Internet. The Internet was designed for the safe transport of data. It has been generally accepted, however, that the delivery of multimedia over the Internet has several major technical problems such as low bandwidth and severe quality degradation to channel error. In contrast to conventional wisdom, I set my research goal in achieving an innovative technique for visual communication over the Internet. Unfortunately, I realized that the technical problems were more severe than I anticipated after learning about video coding algorithms and the Internet transmission characteristics. I understood that voice delivery over the Internet could be possible owing to its simple data structure and the low bit rate characteristic of speech. Video, however, generates too much data in delivering a steady rate of data through the Internet, which has fluctuating bandwidth capacity. Moreover, a small fraction of the loss of video data causes unacceptable quality degradation of the images because of its highly complex data structure. The results of my research work demonstrated these major problems, yet, paradoxically, ignited my curiosity and passion.

What I have completed in achieving my goal

The first step in combating the given technical problems as mentioned above was to find a resolution. The Digital Speech Signal Processing course in my department showed me a gleam of hope. I studied the error control techniques and used them in speech coding as term project. In the project, I learned that a jointly designed source and channel coder could combat the problems caused by frequent and severe transmission errors. Specially, error resilient and network adaptive source coding mainly attracted my inquisitiveness. In order to obtain error resilience, research demonstrates that some quantity of redundant information should be allotted into compressed pure video data. Moreover, the problem of how much redundancy should be inserted could be solved by network adaptive coding; the optimal quantity of redundant information is determined for a given network error rate.

I pursued two kinds of activity for my goal in both directions of theory and practice. First, for practical application, we proposed to implement a Multimedia Transmission System (MTS) as term project of the Digital Image Processing course. MTS consists of many separate parts such as RTP (Real time Transport Protocol), Video and Audio Codec, Video Display and User Interface. I studied the parts of the RTP and error resilient compression algorithm. Until now, we have implemented the basic outline of the system without a consideration of transmission error. So the current version of the system may be considered as optimally designed for error free transmission. Refinements of the system, such as embodiment of error resilient compression algorithm and expedient user interface, are scheduled as further works in progress.

Second, in another direction of research, Joint Source and Channel Coding (JSCC) is subdivided into Multiple Description Coding (MDC), which is a source coding technique relevant to the Internet communications. By representing a source as several pieces, the destination can reconstruct acceptably the original source with tolerance for frequent packet losses. I implemented an MDC system and experimented with several packet loss scenarios and compared the simulation results of MDC system with those obtained from the current version implemented in research of course term project. Consequently, I found that Shannon's theory does not explain the observed results. My conclusion of the research is that jointly designing source and channel coding can achieve quality gain.

How I could achieve my goals at University of Washington, Seattle

Shannon's theory is impertinent to the channel characterized by transient breakdown as well as the scenario such as multi-single or multi-multi communication like the Internet broadcasting. Furthermore, as communication technologies evolve, high bandwidth optical network and conventional telephone line network should coexist in a network. Users with a high performance system or a mobile system with limited capacity could constitute destinations. The problem caused by the heterogeneity of of the both channel and destination, however, has not been solved completely. I believe that the ultimate solution must be JSCC whatever specific technologies are applied. My methodologies for resolving the given problems are:

A) Scalable Source Coding Based on JSCC
B) Reliable Multicast
C) Network Modeling & Exploitation

Conclusion

In two years as a research graduate student, I have devoted myself in accomplishing both theoretical and practical insights into major telecommunication research projects. I developed a pragmatic JSCC technique for the Internet applications and implemented an Internet communication system. Nevertheless, during these graduate years, I touched on a small portion of both theoretical and practical problems or research in the telecommunication field. I want to continue exploring the wide range of telecommunication research problems at the University of Washington, Seattle. I believe that in studying and working with many outstanding professors in telecommunication research fields at the University of Washington, Seattle, my strong theoretical knowledge on JSCC and practical experience of the Internet communications network will contribute to the innovative development of telecommunications technology.
Please see enclosed C.V for more details of my education, research and work backgrounds.

我是猪, 耶耶耶... 哈哈...

寄托天下24Fall留学申请交流群，欢迎加入！

回应
1

使用道具举报

Zephyr2000
UID：97473

寄托新兵

Rank: 2

声望: 0
寄托币: 282
注册时间: 2000-10-29
精华: 1
帖子: 0

沙发

发表于 2001-11-1 08:08:41 |只看该作者

PS:Ph.D. in Electrical and Computer Engineering

STATEMENT OF PURPOSE

Applicant: (Name of Student)
Proposed Department & Degree: Ph.D. in Electrical and Computer Engineering
Semester and year applying for: Fall Semester, 2001

Introduction

I am applying for admission to the Ph.D. program in Electrical and Computer Engineering, at the University of California, Berkeley. I present my research experience and study objectives in this statement of purpose.

Education

I completed a B.S. degree in Electronic Engineering from Chonnam National University, South Korea, in February 1998. I acquired fundamental knowledge and practical application of Electronic Engineering. I was awarded a university fellowship with honors for every semester (eight times). These academic interests and efforts were strong motivations in studying in the communications field, so I decide to continue my studies at graduate school. I was admitted to the Department of Information and Communications at Kwang-Ju Institute of Science and Technology (K-JIST), South Korea, in 1998, even through there was keen competition among candidates. K-JIST is a government-supported institute of higher education and an application-oriented research center. K-JIST is a leading science and technology research institute in ASIA. Moreover, we use English for all academic activities and study with both international students and faculties. I improved my English skills in areas of technical and science writing.

Related Research and Projects

My academic interest in graduate school was in high-speed wireless communication systems. The next generation communication is based on more advanced modem technologies in wireless networks, which support high-speed and wide bandwidth communications applications. Therefore, I concentrated my research on the design of the DDFS (Direct Digital Frequency Synthesizer), which is one of the most important cores in Modem. To implement the DDFS, the CORDIC algorithm is adopted and a FPGA device (XILINX XLA4020pq 240) is used in its implementation. I selected this topic for my MS's thesis, entitled "Study on the CORDIC-based Direct Digital Frequency Synthesizer" in 2000. My article about this topic was published in IEICE Transaction on Fundamental, Communications and Computer in June 2000.

I assisted in developing the modem technology for LMDS, sponsored by the Ministry of Information and Communication from 1998 to 1999. After graduation, as a research associate supported by the KOrea Science and Engineering Foundation (KOSEF), I have been working on a project, entitled "Implementation of Timing and Frequency Synchronizer in High Speed QPSK Modem", sponsored by the Patent of Bureau in South Korea. In this project, my role is in developing a symbol timing and frequency offset estimation algorithm and in implementing the developed algorithm in RTL. At present, I completed the front-end of this implementation with the SYNOPSYS tool and the CADENCE tool. For more information, a copy of my RESUME is enclosed with this SOP.

Proposed Research Areas

I am specifically interested in the efficient implementation of the high-speed modulator/demodulator for a wireless telecommunications environment and in implementing a VLSI digital signal processing system for telecommunications applications. Of course, this hardware implementation will be preceded by a performance analysis of the developed systems. Also, I am interested in implementing a hardware system for a communications application by using a software algorithm such as the CORDIC algorithm. Therefore, I would like to conduct my Ph.D. research in the following areas and work with the Berkeley Wireless Research Center:
1. Study on various Modulation / Demodulation techniques
2. Development and Implementation of High-speed Wireless Communication Systems & VLSI Digital Signal Processing Systems
3. Transition from a Software to a Hardware for Communications applications

Conclusion

Through my research and several projects, I acquired skills in developing modem design technologies and skills to use various CAD tools. Therefore, I firmly believe that my research experience and these specialized skills will be useful for the University of California, Berkeley's current (or future) research and projects related to the wireless communications system design. I will persevere in my efforts in acquiring an advanced knowledge and ability to carry out research in U.C. Berkeley's Ph.D. program. Moreover, I will pursue my studies with the aim of applying my knowledge towards the solution of practical problems in the field of wireless communications system. I hope that my research activities with University of California, Berkeley will contribute in a significant manner to the development of the communications field. Moreover, I thank you for your attention to this statement.

Sincerely yours,

我是猪, 耶耶耶... 哈哈...

使用道具举报

paisley
UID：64183

永久会员

Rank: 16

声望: 6
寄托币: 55110
注册时间: 2001-9-3
精华: 212
帖子: 419

板凳

发表于 2004-8-29 15:34:56 |只看该作者

个人陈述样例8（工科类）
　　During my senior year at Purdue University, I made a decision that has impacted the entire course of my education. While my classmates were making definite decisions about their career paths, I chose to implement a five-year plan of development and growth for myself. I designed this plan in order to examine various careers that I thought might interest me, as well as to expand upon my abilities at the time. As I was attaining a BS degree in Electrical Engineering, I decided to focus primarily on fields related to the VLSI (Very Large-Scale Integrated) circuits area. My main goals were either to gain work experience or to further my education by pursuing an MS degree in Electrical Engineering (MSEE). I saw an opportunity to both work and learn through employment at Xilinx Inc. Operating as a product engineer at a successful, high-tech semiconductor company has enabled me to utilize my technical and interpersonal skills in new and challenging ways. The position has also allowed me to interact with a multitude of departments including marketing, integrated circuit (IC) design, software/CAD development, manufacturing, reliability, accounting, and sales. I thus have gained an array of experience that extended beyond the parameters of my own responsibilities. In the workplace, I rely heavily upon the interpersonal techniques I developed as a counselor in a Purdue residence hall, as well as the organizational skills I had acquired through holding various leadership positions in cultural and engineering societies. I have also cultivated an interest in high-technology marketing that has continued to grow throughout my career. My experiences with Xilinx have heightened my hunger for knowledge in the VLSI field.

　　Two months after joining the corporation, I applied to several part-time programs in the vicinity that would allow me to acquire an MSEE degree within two to three years. San Jose State seemed an ideal choice, for its evening MSEE courses would allow me to pursue two independent, full-time positions concurrently. The San Jose program has complemented my Xilinx duties well; both demand large levels of energy and enthusiasm while guiding me to my ultimate goal, a high degree of education in VLSI sciences. The resources that I poured into both endeavors have reaped many gains. I have been promoted to a Product-Yield Engineering position within Xilinx's Coarse Grain Static Memory (CGSM) Product Engineering division. My extensive coursework plays a key role in my continued success at Xilinx. Relevant classes in advanced digital and analog VLSI design, as well as sub-micron ULSI technology, have allowed me to understand more completely the workings of Xilinx, a fab-less semiconductor company that also functions as a software and hardware design, testing, and marketing center. The gains in knowledge I have made through the combination of work experience and education have indeed been exponential. The academic records of my senior year at Purdue, coupled with my MSEE coursework, are ample proof of my dedication to learning. I feel I have overcome through hard work and dedication to the brief "dry phase" I underwent at Purdue during the close of my sophomore and the first semester of my junior years. My performance at that time is in no way indicative of my usual achievements; they are instead the result of urgent family difficulties that required much foreign travel and serious attention to resolve. In May, I shall graduate with an MSEE degree from San Jose well ahead of my original estimates. This early graduation with Dean's Honors is the result of my firm belief in the value of diligence, as well as my renewed determination to strive for perfection in both work and school.

　　I am now embarking on another five-year plan, during which I hope to fulfill several specific career goals. For instance, being part of a very dynamic and results-oriented Yield team at Xilinx calls for continuous development of computational and statistical techniques. The Yield team is divided to focus on specific process/fabrication issues and process (manufacturing) optimization. My own position is an integral part of the optimization group. Speed and cost issues continue to press high technology atmospheres towards optimization, probability and stochastic processes and systems, and rigorous simulations of mathematical models. The MS in EES&OR offered at your university will grant me the statistical knowledge that is crucial for process and production optimization in a fab-less environment.

　　In addition, product engineering requires fundamental research on mathematical models for linear and non-linear programming, as well as the utilization of efficient computer software. I continuously employ the knowledge I gained at Purdue in Operations Research and advanced mathematics courses. Yet despite the value of these classes and my high performance in them, I now require further education to best fulfill my duties. An MS in the EES&OR field, will give me knowledge that is invaluable to a career in product development, project management and strategic planning. The program will allow me to improve decision-making skills in operations, strategy, and policy issues. I will strengthen my theory and application in countless areas: continuous, discrete, numerical optimization; probabilistic and stochastic processes; dynamic systems and simulation; economics, finance, and investment; decision analysis; dynamic programming and planning under uncertainty; operations and service; corporate and individual strategy; and private and public policy issues. Thus, the EES&OR program will not only help me to excel at Xilinx but will also further any future career.

　　My commitment to work and education over the last three years proves that I will pursue this MS with enthusiasm and zeal. The technical edge that the MS would provide is incomparable. Since I will be working while attending Stanford, I shall mingle education with practical application, and bring to the table interesting problems from my experience and past education. Technical challenges encountered through projects in the EES&OR program will provide motivation and opportunity for methodological innovation. The data collection, processing and presentation issues presented are integral to my future goals, and the management challenges raised will provide invaluable experience for professional practice. This will in turn build a solid foundation for a life-long career that can overcome any problem in decision-making. In addition, taking courses in economics, finance, and investment analysis will allow much growth of knowledge in investment issues in different industries. The EES&OR program thus appeals not only to my engineering, economics, science and mathematical background, but will complement my technical abilities with the conceptual frameworks needed to analyze problems in operations, production, strategic planning, and marketing in the realm of semiconductor/IC/engineering systems.

　　I feel that I am prepared to meet the challenges of the curriculum. My coursework in intermediate microeconomics and macroeconomics, international trade, operations research, linear algebra, and probabilistic methods, along with my extensive calculus background, will allow me to function well within the program. My long-term career goals include a move into marketing and product management. I believe that attaining this MS degree is the cornerstone to achieving my goals. It will give me the academic background necessary to succeed in product development, project management, and strategic planning. It will improve decision-making skills necessary for optimizing performance. The integration of two excellent programs in Economics Systems and Operations Research thus suits my current position and ties in with future goals perfectly by improving decision making in operations, strategy and policy.

　　At present I desire to continue at Xilinx; attending a program that provides the flexibility and convenience of the SITN, is therefore imperative. Hence, being at Stanford as an HCP student also attracts me. I believe that Stanford is the best environment for me to achieve my goals while gaining exposure to and experience with a diverse student body and faculty. It is my belief that one continues to learn throughout one's life, and the most effective method of learning is through interaction with others. Stanford's diversity offers an environment for learning, both inside and outside the classroom. I hope to share my varied knowledge with my classmates and to take from them a new understanding of topics that are foreign to me. I believe that no other school provides students with the combination of education and environment offered by Stanford. Its outstanding academic reputation, mingled with its diverse environment and thriving Bay Area location, creates an opportunity for growth that is second to none. I have many ambitions for myself as I embark on this stage of my life. I believe that an education from Stanford will provide invaluable experiences and skills that will allow me to become a successful and innovative business leader in the new millennium.

转载自新东方网站

UA
我说人生哪，如果赏过一回痛哭淋漓的风景，写一篇杜鹃啼血的文章，与一个赏心悦目的人错肩，也就够了。不要收藏美、钤印美，让美随风而逝。生命最清醉的时候，是将万里长江视为一匹白绢，裂帛。(简桢)

使用道具举报