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2008

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Articles 3391 - 3420 of 4190

Full-Text Articles in Engineering

Phase And Amplitude Modulated Ofdm For Dispersion Managed Wdm Systems, Andreas Eisele Jan 2008

Phase And Amplitude Modulated Ofdm For Dispersion Managed Wdm Systems, Andreas Eisele

Electronic Theses and Dissertations

Amplitude and phase modulated optical OFDM (Orthogonal Frequency Division Multiplexing) are analyzed in a 50GBit/s single channel and 40GBit/s 5 channel 512 subcarrier non-ideal dispersion-compensated fiber optic communication systems. PM-OFDM is investigated as an alternative to AM-OFDM to alleviate the problem associated with amplitude-modulated signals in a nonlinear medium. The inherent dispersion compensation capability in OFDM (using a cyclic prefix) allows transmission over a link whose dispersion map is not exactly known. OFDM also mitigates the effects of dispersion slope in wavelength-division multiplexed (WDM) systems. Moreover, the overall dispersion throughout the transmission link may vary due to environmental effects and …

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High Power Mode-Locked Semiconductor Lasers And Their Applications, Shinwook Lee Jan 2008

High Power Mode-Locked Semiconductor Lasers And Their Applications, Shinwook Lee

Electronic Theses and Dissertations

In this dissertation, a novel semiconductor mode-locked oscillator which is an extension of eXtreme Chirped Pulse Amplification (XCPA) is investigated. An eXtreme Chirped Pulse Oscillator (XCPO) implemented with a Theta cavity also based on a semiconductor gain is presented for generating more than 30ns frequency-swept pulses with more than 100pJ of pulse energy and 3.6ps compressed pulses directly from the oscillator. The XCPO shows the two distinct characteristics which are the scalability of the output energy and the mode-locked spectrum with respect to repetition rate. The laser cavity design allows for low repetition rate operation < 100MHz. The cavity significantly reduces nonlinear carrier dynamics, integrated self phase modulation (SPM), and fast gain recovery in a Semiconductor optical Amplifier (SOA). Secondly, a functional device, called a Grating Coupled Surface Emitting Laser (GCSEL) is investigated. For the first time, passive and hybrid mode-locking of a GCSEL is achieved by using saturable absorption in the passive section of GCSEL. To verify the present limitation of the GCSEL for passive and hybrid mode-locking, a dispersion matched cavity is explored. In addition, a Grating Coupled surface emitting Semiconductor Optical Amplifier (GCSOA) is also investigated to achieve high energy pulse. An energy extraction experiment for GCSOA using stretched pulses generated from the colliding pulse semiconductor mode-locked laser via a chirped fiber bragg grating, which exploits the XCPA advantages is also demonstrated. Finally, passive optical cavity amplification using an enhancement cavity is presented. In order to achieve the interferometric stability, the Hänsch-Couillaud Method is employed to stabilize the passive optical cavity. The astigmatism-free optical cavity employing an acousto-optic modulator (AOM) is designed and demonstrated. In the passive optical cavity, a 7.2 of amplification factor is achieved with a 50 KHz dumping rate.

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A Meta Analysis Of Critical Success Factors For Computer Technology Projects, Ross A. Baker Jan 2008

A Meta Analysis Of Critical Success Factors For Computer Technology Projects, Ross A. Baker

Theses

Project managers are continually in pursuit of a magic formula that will deliver a successful project. Companies arc interested in formulas for project success because billions of dollars arc wasted each year, in U.S.A. Information Technology projects alone. through poorly managed or failed projects. Failing projects arc not only bad for the individual project team members, but a failed project's impacts emanate outward to cause companies to decline or die. In addition, the targeted customers who receive inferior products, late products, or no products at all (due to project failures) are significantly impacted as well. Because failed computer technology projects …

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Dynamics Of Pipa-D₇ On Silica Surface, Piyawan Krisanangkura, Frank D. Blum Jan 2008

Dynamics Of Pipa-D₇ On Silica Surface, Piyawan Krisanangkura, Frank D. Blum

Chemistry Faculty Research & Creative Works

Molecular motion of polymer chains is an important determinant in understanding the physical properties of polymeric materials. Glass transition temperature (Tg) is a physical property of polymers, which is of primary interest. The study of the dynamics of polymer segments assists in understanding the dependence of Tg on polymer structure.1 For decades, studies have addressed the molecular motion in various polymers. Some of them have probed the dynamics of polymer backbones.2,3 the properties of a polymer at an interface may change because of the type of polymer, the substrate, or other variables. The side chain of a polymer can also …

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Individual-Based Artificial Ecosystems For Design And Optimization, Srinivasa Shivakar Vulli, Sanjeev Agarwal Jan 2008

Individual-Based Artificial Ecosystems For Design And Optimization, Srinivasa Shivakar Vulli, Sanjeev Agarwal

Electrical and Computer Engineering Faculty Research & Creative Works

Individual-Based modeling has gained popularity over the last decade, mainly due to its proven ability to address a variety of problems, including modeling complex systems from bottom-up, providing relationships between component level and system level parameters, and relating emergent system level behaviors from simple component level interactions. Availability of computational power to run simulation models with thousands to millions of agents is another driving force in the wide-spread adoption of individual-Based modeling. in this paper, we propose an individual-Based modeling approach to solve engineering design and optimization problems using artificial ecosystems (AES). the problem to be solved is "mapped" to …

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Generalized Hamilton-Jacobi-Bellman Formulation-Based Neural Network Control Of Affine Nonlinear Discrete-Time Systems, Zheng Chen, Jagannathan Sarangapani Jan 2008

Generalized Hamilton-Jacobi-Bellman Formulation-Based Neural Network Control Of Affine Nonlinear Discrete-Time Systems, Zheng Chen, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, we consider the use of nonlinear networks towards obtaining nearly optimal solutions to the control of nonlinear discrete-time (DT) systems. The method is based on least squares successive approximation solution of the generalized Hamilton-Jacobi-Bellman (GHJB) equation which appears in optimization problems. Successive approximation using the GHJB has not been applied for nonlinear DT systems. The proposed recursive method solves the GHJB equation in DT on a well-defined region of attraction. The definition of GHJB, pre-Hamiltonian function, HJB equation, and method of updating the control function for the affine nonlinear DT systems under small perturbation assumption are proposed. …

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Alternatives To Fuel Tax: A State Level Perspective, Jungeun (Jen) Oh, Kumares C. Sinha Jan 2008

Alternatives To Fuel Tax: A State Level Perspective, Jungeun (Jen) Oh, Kumares C. Sinha

JTRP Technical Reports

Under the current fuel-tax-based highway financing system, the funding gap between highway needs and revenue available is expected to grow as vehicle fuel economy improves and use of alternative fuels increases. Consequently, the highway financing mechanism needs to be restructured or a different financing strategy undertaken. Previous research provided examples of successful implementation of pricing schemes in terms of design of pricing scheme, technology issues, legal and institutional issues, and public acceptability. Synthesizing this information, a methodological framework was established for evaluation of alternative user charging schemes. Based on the assessment of the current and projected highway revenue and the …

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Post-Construction Evaluation Of Lime-Treated Soils, Chulmin Jung, Antonio Bobet Jan 2008

Post-Construction Evaluation Of Lime-Treated Soils, Chulmin Jung, Antonio Bobet

JTRP Technical Reports

Lime is used to treat weak subgrade soils during construction of highways. A small amount of lime (4 to 7%) is used to rapidly dehydrate and modify fine grained soils. The modification process improves workability and compactability of the soils. Although the lime modification process is primarily aimed at construction expediency, additional effects such as long-term improvement of stiffness and/or strength by pozzolanic and carbonation cementation reactions are expected. Lime treatment has been employed in Indiana over several decades, but the long-term performance of lime-treated soils has not been well quantified and no field tests have been done on roads …

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Multiplexed Predictive Control Of A Large Commercial Turbofan Engine, Hanz Richter, Anil V. Singaraju, Jonathan S. Litt Jan 2008

Multiplexed Predictive Control Of A Large Commercial Turbofan Engine, Hanz Richter, Anil V. Singaraju, Jonathan S. Litt

Mechanical Engineering Faculty Publications

Model predictive control is a strategy well-suited to handle the highly complex, nonlinear, uncertain, and constrained dynamics involved in aircraft engine control problems. However, it has thus far been infeasible to implement model predictive control in engine control applications, because of the combination of model complexity and the time allotted for the control update calculation. In this paper, a multiplexed implementation is proposed that dramatically reduces the computational burden of the quadratic programming optimization that must be solved online as part of the model-predictive-control algorithm. Actuator updates are calculated sequentially and cyclically in a multiplexed implementation, as opposed to the …

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Combined Scalability Coding Based On The Scalable Extension Of H.264/Avc, Sangseok Park Jan 2008

Combined Scalability Coding Based On The Scalable Extension Of H.264/Avc, Sangseok Park

Electrical Engineering Dissertations - Archive

Fine-grain scalability (FGS) based on significant and refinement coding is one of the ways to achieve quality scalability by providing a graceful quality degradation through truncations of the FGS enhancement layer. This approach is useful for video conferencing and telephony on wireless networks, which need to ensure real-time and low-delay conditions since they are subject to serious bit rate fluctuations. The simplification of FGS is proposed to reduce the overall complexity for the Progressive Refinement (PR) slice. The one pass scanning structure is introduced to simplify the coding pass of the FGS layers and the code type method is also …

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Cs 714-01: Machine Learning, Shaojun Wang Jan 2008

Cs 714-01: Machine Learning, Shaojun Wang

Computer Science & Engineering Syllabi

No abstract provided.

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Cs 765-01: Foundations Of Neurocomputation, John C. Gallagher Jan 2008

Cs 765-01: Foundations Of Neurocomputation, John C. Gallagher

Computer Science & Engineering Syllabi

This course is designed to help you develop a solid understanding of neural network algorithms and architectures. At the end of this course you should be able to read and critically evaluate most neural network papers published in major journals, (e.g. IEEE Transaction on Neural Networks, Neural Networks, and Neural Computation). In addition, you should be able to implement a broad range of network architectures and learning algorithms for a variety of applications.

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Cs 205-08: Introduction To Computers And Office Productivity Software, Kim Gros Jan 2008

Cs 205-08: Introduction To Computers And Office Productivity Software, Kim Gros

Computer Science & Engineering Syllabi

Focus on learning MS Office software applications including word processing (intermediate), spreadsheets, database and presentation graphics using a case study approach where critical thinking and problem solving skills are required. Computer concepts are integrated throughout the course to provide an understanding of the basics of computing, the latest technological advances and how they are used in industry. Ethics and issues encountered in business are discussed to challenge students on societal impact of technology.

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Cs 790-03: Services Science, Yong Pei Jan 2008

Cs 790-03: Services Science, Yong Pei

Computer Science & Engineering Syllabi

Service Science, Management, and Engineering (SSME), often referred to
as Services Science, is emerging as a distinct field of study. It
encompasses numerous areas relating to the increasing role of services
in the world economy. In this course we will focus primarily on
services computing, or the technical aspects of services science, and
secondarily on the allied economic, business, and organizational aspects

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Cs 142-01: Computer Programming - Ii, Michael Ondrasek Jan 2008

Cs 142-01: Computer Programming - Ii, Michael Ondrasek

Computer Science & Engineering Syllabi

The concepts introduced in CS 141 are developed in greater detail and depth with the Java programming language. Topics include object oriented programming, graphics, development of user interfaces and handling runtime errors with an emphasis on program verification and testing. Students must register for both lecture and one laboratory section. 4 credit hours. Prerequisite: CS 141 (Computer Programming I) and MTH 127 (College Algebra) or equivalent.

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Cs 317-01: Numerical Methods Ii, Ronald F. Taylor Jan 2008

Cs 317-01: Numerical Methods Ii, Ronald F. Taylor

Computer Science & Engineering Syllabi

Continuation of CS/MTH/3161516. Introduction to numerical methods used in the sciences. Methods for solving matrix eigenvalue problems, initial value and boundary value problem for ordinary differential equations (ODEs). Study of standard types of partial differential equations (PDEs) with applications. Solution techniques for systems of nonlinear equations. Discussion of sources of error in numerical methods. Special topics and applications presented as schedule permits. Four credit hours.

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Cs 208-01: Computer Programming For Business I, David M. Hutchison Jan 2008

Cs 208-01: Computer Programming For Business I, David M. Hutchison

Computer Science & Engineering Syllabi

CS 208 is the first in a sequence of two programming classes required for MIS majors. This course will introduce students to the basic concepts of programming. Examples are from business applications and display graphics and emphasis is on problem solving with the computer as a tool.

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Cs 214-01: Visual Basic Programming, Michael Ondrasek Jan 2008

Cs 214-01: Visual Basic Programming, Michael Ondrasek

Computer Science & Engineering Syllabi

This course provides a general introduction to the fundamentals of object computer programming. Examples from and applications to a broad range of problems are given. No prior know ledge of programming is assumed. However, students should have a familiarity with programming concepts. The concepts covered will be applied in the Visual Basic programming language. 4 credit hours.

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Cs 240-01: Introduction To Computer Science, Jay Dejongh Jan 2008

Cs 240-01: Introduction To Computer Science, Jay Dejongh

Computer Science & Engineering Syllabi

Basic concepts of programming and programming languages are introduced. Emphasis is on structured programming and stepwise refinement. Prerequisite: MTH 130 or MPL 5.

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Cs 701-01: Database Systems And Design, Soon M. Chung Jan 2008

Cs 701-01: Database Systems And Design, Soon M. Chung

Computer Science & Engineering Syllabi

Introduction of DB design concepts and operating principles of database systems.

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Cs 205: Introduction To Computers And Office Productivity Software, Ann Tirpack Jan 2008

Cs 205: Introduction To Computers And Office Productivity Software, Ann Tirpack

Computer Science & Engineering Syllabi

Focus on learning MS Office software applications including word processing (intermediate), spreadsheets, database and presentation graphics using a case study approach where critical thinking and problem solving skills are required. Computer concepts are integrated throughout the course to provide an understanding of the basics of computing, the latest technological advances and how they are used in industry. Ethics and issues encountered in business are discussed to challenge students on societal impact of technology.

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Cs 771-01: Natural Language Processing Techniques, Shaojun Wang Jan 2008

Cs 771-01: Natural Language Processing Techniques, Shaojun Wang

Computer Science & Engineering Syllabi

No abstract provided.

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Cs 790-02: Advanced Data Mining, Guozhu Dong Jan 2008

Cs 790-02: Advanced Data Mining, Guozhu Dong

Computer Science & Engineering Syllabi

This course covers advanced topics in data mining. The topics can be roughly classified along the following dimensions: pattern/model types, mining/analysis techniques, and data types. The course will examine sequence mining, text mining, graph mining, data cube mining, microarray gene expression mining, stream mining, time series mining, web mining, bioinformatics, privacy issues, etc.

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Ceg 820-01: Computer Architecture Ii, Soon M. Chung Jan 2008

Ceg 820-01: Computer Architecture Ii, Soon M. Chung

Computer Science & Engineering Syllabi

Continuation of CEG720 with more details on multiprocessor systems, parallel processing, and performance analysis.

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Cs 209-01: Computer Programming For Business Ii, Dennis Kellermeier Jan 2008

Cs 209-01: Computer Programming For Business Ii, Dennis Kellermeier

Computer Science & Engineering Syllabi

CS 209 is the second of a two quarter sequence in programming for business students. It is required for Management Information Science majors. The courses are designed to help students achieve a high degree of facility in intermediate level programming.

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Ceg 233-01: Linux And Windows, Prabhaker Mateti Jan 2008

Ceg 233-01: Linux And Windows, Prabhaker Mateti

Computer Science & Engineering Syllabi

Introduction to Linux and Windows systems. GUI and Windowing Systems. Files and Directories. Ownership and Sharing. Programs and Processes. System calls, Libraries. Loading. Dynamic linking. Command Line Shells. Scripting languages. Regular expressions. Clients and Servers. Web browser clients and servers. Secure shell, sftp. SSL/TSL. HTTPS. System Administration. 4 credit hours. 3 hours lectures, 2 hours labs.

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Ceg 355-01: Introduction To The Design Of Information Technology Systems, Thomas C. Hartrum Jan 2008

Ceg 355-01: Introduction To The Design Of Information Technology Systems, Thomas C. Hartrum

Computer Science & Engineering Syllabi

Introduction to the design of information systems comprising modem technologies such as SQL database programming, networks, and distributed computing with CORBA, electronic and hypertext (HTML) documents, and multimedia.

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Ceg 402/602-01: Introduction To Computer Communication, Bin Wang Jan 2008

Ceg 402/602-01: Introduction To Computer Communication, Bin Wang

Computer Science & Engineering Syllabi

No abstract provided.

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Ceg 220-01: Introduction To C Programming For Engineers, Jay Dejongh Jan 2008

Ceg 220-01: Introduction To C Programming For Engineers, Jay Dejongh

Computer Science & Engineering Syllabi

This course provides a general introduction to computers as a problem-solving tool using the C programming language. Emphasis is on algorithms and techniques useful to engineers. Topics include data representation, debugging, and program verification. 4 credit hours. Prerequisite: MTH 229 (Calculus I) or EGR 10 l (Engineering Mathematics).

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Ceg 435/635-01: Distributed Computing And Systems, Yong Pei Jan 2008

Ceg 435/635-01: Distributed Computing And Systems, Yong Pei

Computer Science & Engineering Syllabi

Study of process coordination, client-server computing, distributed objects, transactions, concurrency control, recovery of transactions, network and distributed file systems, distributed operating systems, and fault-tolerant computing.

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