Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2007

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 24151 - 24180 of 25645

Full-Text Articles in Entire DC Network

Optimal Diversity Combining Based On Linear Estimation Of Rician Fading Channels, Jingxian Wu, Chengshan Xiao Jan 2007

Optimal Diversity Combining Based On Linear Estimation Of Rician Fading Channels, Jingxian Wu, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

Optimal receiver diversity combining employing linear channel estimation is examined. Based on the statistical properties of pilot-assisted least-squares (LS) and minimum mean square error (MMSE) channel estimation, an optimal diversity receiver for wireless systems employing practical linear channel estimation on Rician fading channels is proposed. Exact analytical expressions for the symbol error rates of LS and MMSE channel estimation aided optimal diversity combining are derived. It is shown that an MPSK wireless system with MMSE channel estimation has the same SER when the MMSE channel estimation is replaced by LS estimation. This is an interesting counter-example to the common perception …

Go to article

Performance Analysis Of Wireless Systems With Doubly Selective Rayleigh Fading, Jingxian Wu, Chengshan Xiao Jan 2007

Performance Analysis Of Wireless Systems With Doubly Selective Rayleigh Fading, Jingxian Wu, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

Theoretical error performances of wireless communication systems suffering from both doubly selective (time varying and frequency selective) Rayleigh fading and sampler timing offset are analyzed in this paper. Single-input-single-output systems with doubly selective fading channels are equivalently represented as discrete-time single-input-multiple-output (SIMO) systems with correlated frequency-flat fading channels, with the correlation information being determined by the combined effects of sampler timing phase, maximum Doppler spread, and power delay profile of the physical fading. Based on the equivalent SIMO system representation, closed-form error-probability expressions are derived as tight lower bounds for linearly modulated systems with fractionally spaced equalizers. The information on …

Go to article

Route Aware Predictive Congestion Control Protocol For Wireless Sensor Networks, Carl Larsen, Maciej Jan Zawodniok, Jagannathan Sarangapani Jan 2007

Route Aware Predictive Congestion Control Protocol For Wireless Sensor Networks, Carl Larsen, Maciej Jan Zawodniok, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

Congestion in wireless sensor networks (WSN) may lead to packet losses or delayed delivery of important information rendering the WSN-based monitoring or control system useless. In this paper a routing-aware predictive congestion control (RPCC) yet decentralized scheme for WSN is presented that uses a combination of a hop by hop congestion control mechanism to maintain desired level of buffer occupancy, and a dynamic routing scheme that works in concert with the congestion control mechanism to forward the packets through less congested nodes. The proposed adaptive approach restricts the incoming traffic thus preventing buffer overflow while maintaining the rate through an …

Go to article

Two Neural Network Based Decentralized Controller Designs For Large Scale Power Systems, Wenxin Liu, Jagannathan Sarangapani, Ganesh K. Venayagamoorthy, Donald C. Wunsch, Mariesa Crow, David A. Cartes Jan 2007

Two Neural Network Based Decentralized Controller Designs For Large Scale Power Systems, Wenxin Liu, Jagannathan Sarangapani, Ganesh K. Venayagamoorthy, Donald C. Wunsch, Mariesa Crow, David A. Cartes

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents two neural network (NN) based decentralized controller designs for large scale power systems' generators, one is for the excitation control and the other is for the steam valve control. Though the control signals are calculated using local signals only, the transient and overall system stabilities can be guaranteed. NNs are used to approximate the unknown and/or imprecise dynamics of the local power system and the interconnection terms, thus the requirements for exact system parameters are released. Simulation studies with a three machine power system demonstrate the effectiveness of the proposed controller designs.

Go to article

Improvement Of Can Bus Performance By Using Error-Correction Codes, Krishna Chaitanya Emani, Maciej Jan Zawodniok, Y. Rosa Zheng, Jagannathan Sarangapani, Keong W. Kam Jan 2007

Improvement Of Can Bus Performance By Using Error-Correction Codes, Krishna Chaitanya Emani, Maciej Jan Zawodniok, Y. Rosa Zheng, Jagannathan Sarangapani, Keong W. Kam

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, two variants of the Hybrid Automatic Repeat Request (HARQ) scheme for CAN bus are presented. The basic HARQ uses error-correction code based on the Reed- Solomon (RS) technique and the Cyclic Redundancy Check (CRC) method to detect errors. The second scheme uses the cyclic error-correction method instead of the CRC error-detection method to further improve the throughput. Moreover, the second scheme uses no additional bit overhead when compared with the basic HARQ scheme. This paper presents the performance of the proposed schemes using MATLAB and NS2 simulations. Experimental data of error patterns were used for realistic evaluation. …

Go to article

Neural Network Control Of Robot Formations Using Rise Feedback, Jagannathan Sarangapani, Travis Alan Dierks Jan 2007

Neural Network Control Of Robot Formations Using Rise Feedback, Jagannathan Sarangapani, Travis Alan Dierks

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a combined kinematic/torque control law is developed for leader-follower based formation control using backstepping in order to accommodate the dynamics of the robots and the formation in contrast with kinematic-based formation controllers that are widely reported in the literature. A neural network (NN) is introduced along with robust integral of the sign of the error (RISE) feedback to approximate the dynamics of the follower as well as its leader using online weight tuning. It is shown using Lyapunov theory that the errors for the entire formation are asymptotically stable and the NN weights are bounded as opposed …

Go to article

Mobile Speed Estimation For Broadband Wireless Communications, Y. Rosa Zheng, Chengshan Xiao Jan 2007

Mobile Speed Estimation For Broadband Wireless Communications, Y. Rosa Zheng, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a new algorithm is proposed to estimate mobile speed for broadband wireless communications, which often encounter large number of fading channel taps causing severe intersymbol interference. Theoretical analysis is first derived and practical algorithm is proposed based on the analytical results. The algorithm employs a modified auto-covariance of received signal power to estimate the speed of mobiles. The algorithm is based on the received signals which contain unknown transmitted data, unknown frequency selective multipaths possibly including line-of-sight (LOS) component, and random receiver noise. The algorithm works well for frequency selective Rayleigh and Rician channels. The algorithm is …

Go to article

Faculty Senate Librarian's Report-2007, Georgia Southern University Jan 2007

Faculty Senate Librarian's Report-2007, Georgia Southern University

Faculty Senate: Librarian's Reports

No abstract provided.

Go to article

Faculty Handbook, Georgia Southern University Jan 2007

Faculty Handbook, Georgia Southern University

Faculty Handbooks

Faculty Handbook for Georgia Southern University for the 2007-2008 academic year. The Faculty Handbook is published online by the Office of the Vice President for Academic Affairs and archived in Digital Commons@Georgia Southern.

Go to article

Bylaws Of The Faculty Senate 11-27-2007, Georgia Southern University Jan 2007

Bylaws Of The Faculty Senate 11-27-2007, Georgia Southern University

Faculty Senate: Index

No abstract provided.

Go to article

Faculty Senate Minutes 2006 - 2007, Missouri University Of Science And Technology Faculty Senate Jan 2007

Faculty Senate Minutes 2006 - 2007, Missouri University Of Science And Technology Faculty Senate

Minutes & Agendas

No abstract provided.

Go to article

Managerial Cost Accounting, Christopher M. Fairchild Jan 2007

Managerial Cost Accounting, Christopher M. Fairchild

Syllabus Repository

No abstract provided.

Go to article

Intermediate Accounting Ii, William Hahn Jan 2007

Intermediate Accounting Ii, William Hahn

Syllabus Repository

No abstract provided.

Go to article

Not-For-Profit-Accounting, Steelman Library Jan 2007

Not-For-Profit-Accounting, Steelman Library

Syllabus Repository

No abstract provided.

Go to article

A Survey Of The Perceptions Of The Senior Students On The Achievement Of The Jesuit Educational Ideals In Two Jesuit Secondary Schools In Madagascar, Jean De Dieu Randrianaivo Jan 2007

A Survey Of The Perceptions Of The Senior Students On The Achievement Of The Jesuit Educational Ideals In Two Jesuit Secondary Schools In Madagascar, Jean De Dieu Randrianaivo

Doctoral Dissertations

unavailable

Go to article

Fighting The Freeloader Effect : Cooperation, Attitude, And Achievement In A Jesuit Secondary Math Classroom, Kevin Quattrin Jan 2007

Fighting The Freeloader Effect : Cooperation, Attitude, And Achievement In A Jesuit Secondary Math Classroom, Kevin Quattrin

Doctoral Dissertations

unavailable

Go to article

The Impact Of Participation In Collegiate Athletics On Women Athletes' Academic Experience At Select Jesuit Universities, Hillary D. Mckinney Jan 2007

The Impact Of Participation In Collegiate Athletics On Women Athletes' Academic Experience At Select Jesuit Universities, Hillary D. Mckinney

Doctoral Dissertations

unavailable

Go to article

Hear Our Voices : African American Parent And Student Perspectives For Promoting Academic Excellence In Elementary Schooling, Bweikia Foster Jan 2007

Hear Our Voices : African American Parent And Student Perspectives For Promoting Academic Excellence In Elementary Schooling, Bweikia Foster

Doctoral Dissertations

unavailable

Go to article

The Implications Of Technology For Women Of Pakistan In Higher Education : A Qualitative Analysis, Anniqua Rana Jan 2007

The Implications Of Technology For Women Of Pakistan In Higher Education : A Qualitative Analysis, Anniqua Rana

Doctoral Dissertations

unavailable

Go to article

Indigenous Linguistically And Culturally Connected Community Health Educators/Promotoras : Preventing Hiv/Aids In The Latino Community, Alba Lucia Diaz-Cuellar Jan 2007

Indigenous Linguistically And Culturally Connected Community Health Educators/Promotoras : Preventing Hiv/Aids In The Latino Community, Alba Lucia Diaz-Cuellar

Doctoral Dissertations

unavailable

Go to article

Motivations Of Jewish Adolescents In A British Hebrew School : Identity, Socialization, And Language Learning, Vikki Lynn Atkinson Jan 2007

Motivations Of Jewish Adolescents In A British Hebrew School : Identity, Socialization, And Language Learning, Vikki Lynn Atkinson

Doctoral Dissertations

unavailable

Go to article

Undergraduate Students' Perceptions Of Their Holocaust And Genocide Education, Carol Berry Hurwitz Jan 2007

Undergraduate Students' Perceptions Of Their Holocaust And Genocide Education, Carol Berry Hurwitz

Doctoral Dissertations

unavailable

Go to article

Touching The Spirit As A Motivating Factor For African American Students To Achieve Academic Excellence, E'Leva D.H. Gibson Jan 2007

Touching The Spirit As A Motivating Factor For African American Students To Achieve Academic Excellence, E'Leva D.H. Gibson

Doctoral Dissertations

unavailable

Go to article

Success Factors In Mergers And Acquisitions : Complexity Theory And Content Analysis Perspectives, Lena Petsa-Papanicolaou Jan 2007

Success Factors In Mergers And Acquisitions : Complexity Theory And Content Analysis Perspectives, Lena Petsa-Papanicolaou

Doctoral Dissertations

unavailable

Go to article

Through The Lens Of The Adolescent : A Survey Of At-Risk Behaviors, Sandra L. Ahmann Jan 2007

Through The Lens Of The Adolescent : A Survey Of At-Risk Behaviors, Sandra L. Ahmann

Doctoral Dissertations

unavailable

Go to article

Espoused Curriculum And Philosophy And Curriculum And Philosophy-In-Use In A K-12 Public Charter School System, Elizabeth G. Polito Jan 2007

Espoused Curriculum And Philosophy And Curriculum And Philosophy-In-Use In A K-12 Public Charter School System, Elizabeth G. Polito

Doctoral Dissertations

unavailable

Go to article

Alcohol And Drug Service Providers' Perceptions Of Interagency Collaboration With Child Welfare Services, Verronda L. Moore Jan 2007

Alcohol And Drug Service Providers' Perceptions Of Interagency Collaboration With Child Welfare Services, Verronda L. Moore

Doctoral Dissertations

unavailable

Go to article

A Guide To The Establishment Of A University Satellite Program, Abbie Marie Stewart Jan 2007

A Guide To The Establishment Of A University Satellite Program, Abbie Marie Stewart

Masters Theses

"The UMR SAT team was formed at the University of Missouri-Rolla to design and build microsatellites. The team competed against ten other universities in the Nanosat 4 competition hosted by the Air Force Office of Scientific Research, the Air Force Research Laboratory, and the American Institute of Aeronautics and Astronautics. This document, written by the Chief Engineer, is a description of the process used by the UMR SAT team to develop a successful satellite program. Included in the document are methods based on systems engineering for developing a mission, a discussion of team organization and recruitment, and lessons learned during …

Go to article

Towards A Methodology For Integrated Freeform Manufacturing Systems Development With A Control Systems Emphasis, Jacquelyn K. Stroble Jan 2007

Towards A Methodology For Integrated Freeform Manufacturing Systems Development With A Control Systems Emphasis, Jacquelyn K. Stroble

Masters Theses

"A variety of fully integrated Freeform Fabrication (FFF) systems have been developed, a selected group for research and several for commercialization. The design methodology behind most of them is not documented, standardized, or rational. It is important to understand that the final product from any integrated system is affected not only by the unit manufacturing processes themselves, but also by the extent the individual units are assimilated into an integrated process. Thus, a scheme consisting of eight steps and the salient five elements necessary to create or retrofit an existing system to achieve an Integrated Freeform Manufacturing System (FFMS) is …

Go to article

Reinforcement-Learning Based Output-Feedback Controller For Nonlinear Discrete-Time System With Application To Spark Ignition Engines Operating Lean And Egr, Peter Shih Jan 2007

Reinforcement-Learning Based Output-Feedback Controller For Nonlinear Discrete-Time System With Application To Spark Ignition Engines Operating Lean And Egr, Peter Shih

Masters Theses

"A spark ignition (SI) engine can be described by non-strict feedback nonlinear discrete-time system with the output dependent upon on the states in a nonlinear manner. The controller developed in this thesis utilizes the inherent universal approximation property of neural networks (NN) to simplify the design process and solve the non-causality problem inherent with traditional designs. It also exploits a long-term performance index called the strategic utility function to minimize and assist in updating of the NN weights; therefore, an optimal controller can be realized. Finally, through Lyapunov equations, the controller guarantees stability"--Abstract, page iv.

Go to article

First Prev Next Last