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

Digital Commons Network™

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

2003

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 12211 - 12240 of 12373

Full-Text Articles in Entire DC Network

That Wonderful Year: Smallpox, Genetic Engineering, And Bio-Terrorism, David A. Koplow Jan 2003

That Wonderful Year: Smallpox, Genetic Engineering, And Bio-Terrorism, David A. Koplow

Georgetown Law Faculty Publications and Other Works

The thesis of this Article is that the United States, Russia, and by extension, the world as a whole, are pursuing a fundamentally sound strategy in retaining, rather than destroying, the last known remaining samples of the variola virus. For now, those samples are housed in secure, deep-freeze storage at the U.S. Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia and at the comparable Russian facility, known as Vector, near Novosibirsk, Siberia. But that basic decision is about the only correct move we are making at this time - and even it is animated by fundamental misapprehensions about …

Go to article

Dual Heuristic Programming Excitation Neurocontrol For Generators In A Multimachine Power System, Ganesh K. Venayagamoorthy, Donald C. Wunsch, Ronald G. Harley Jan 2003

Dual Heuristic Programming Excitation Neurocontrol For Generators In A Multimachine Power System, Ganesh K. Venayagamoorthy, Donald C. Wunsch, Ronald G. Harley

Electrical and Computer Engineering Faculty Research & Creative Works

The design of nonlinear optimal neurocontrollers that replace the conventional automatic voltage regulators for excitation control of turbogenerators in a multimachine power system is presented in this paper. The neurocontroller design is based on dual heuristic programming (DHP), a powerful adaptive critic technique. The feedback variables are completely based on local measurements from the generators. Simulations on a three-machine power system demonstrate that DHP-based neurocontrol is much more effective than the conventional proportional-integral-derivative control for improving dynamic performance and stability of the power grid under small and large disturbances. This paper also shows how to design optimal multiple neurocontrollers for …

Go to article

Erasure And Recognition: The Census, Race And The National Imagination, Naomi Mezey Jan 2003

Erasure And Recognition: The Census, Race And The National Imagination, Naomi Mezey

Georgetown Law Faculty Publications and Other Works

This Article is concerned with the constitutive power of the census with respect to race. It is an examination of the U.S. Census as an aspect of what Angela Harris calls race law, "law pertaining to the formation, recognition, and maintenance of racial groups, as well as the law regulating the relationships among these groups." While others have noted and explored the epistemological and constitutive functions of the census race categories, my aim is to unpack this insight in the context of two specific examples of categorical change and contest: the addition of a Chinese racial category in 1870 and …

Go to article

From Ridge To River| Conserving Open Space In Missoula, Montana, Jed D. Little Jan 2003

From Ridge To River| Conserving Open Space In Missoula, Montana, Jed D. Little

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Control Of Cascaded Multi-Level Inverters, Keith Corzine, Fang Zheng Peng, J. Wang, M. W. Wielebski Jan 2003

Control Of Cascaded Multi-Level Inverters, Keith Corzine, Fang Zheng Peng, J. Wang, M. W. Wielebski

Electrical and Computer Engineering Faculty Research & Creative Works

A new type of multi-level inverter is introduced which is created by cascading two three-phase three-level inverters using the load connection. This new inverter can operate as a nine-level inverter and naturally splits the power conversion into a higher voltage lower-frequency inverter and a lower-voltage higher frequency inverter. This type of system presents particular advantages to naval ship propulsion systems which rely on high power quality, survivable drives. New control methods are described involving both joint and separate control of the individual three-level inverters. Simulation results demonstrate the effectiveness of both controls. A laboratory set-up at the Naval Surface Warfare …

Go to article

Voltage Balancing Control Of Diode-Clamped Multilevel Rectifier/Inverter Systems, Zhiguo Pan, Keith Corzine, V. R. Stefanovic, J. M. Leuthen, Fang Zheng Peng Jan 2003

Voltage Balancing Control Of Diode-Clamped Multilevel Rectifier/Inverter Systems, Zhiguo Pan, Keith Corzine, V. R. Stefanovic, J. M. Leuthen, Fang Zheng Peng

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a new voltage balancing control for the diode-clamped multilevel rectifier/inverter system. A complete analysis of the voltage balance theory for a 5-level back-to-back system is given. The analysis is based on fundamental frequency switching control and then extended to pulse-width modulation. The method involves obtaining optimal switching angles; a process which is described in detail in this paper. The proposed control strategy regulates the DC bus voltage, balances the capacitors, and decreases the harmonic components of the voltage and current. Simulation and experimental results demonstrate the validity of the optimizing method and control theory.

Go to article

An Industrial Food Processing Plant Automation Using A Hybrid Of Pi And Fuzzy Logic Control, Ganesh K. Venayagamoorthy, D. Naidoo, P. Govender Jan 2003

An Industrial Food Processing Plant Automation Using A Hybrid Of Pi And Fuzzy Logic Control, Ganesh K. Venayagamoorthy, D. Naidoo, P. Govender

Electrical and Computer Engineering Faculty Research & Creative Works

An industrial food processing plant consisting of nonlinear dynamics requires pressure and temperature controllers to be nonlinear. In this paper, nonlinear controllers are designed using fuzzy logic to augment the conventional pressure and temperature PI controllers for an industrial food processing plant. Simulation results are presented to show improvement in the plant response with the hybrid controllers.

Go to article

Ecology And Cultural Significance Of Western Larch| A Literature Review, Janette S. Scher Jan 2003

Ecology And Cultural Significance Of Western Larch| A Literature Review, Janette S. Scher

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

A Comparison Of Dual Heuristic Programming (Dhp) And Neural Network Based Stochastic Optimization Approach On Collective Robotic Search Problem, Nian Zhang, Donald C. Wunsch Jan 2003

A Comparison Of Dual Heuristic Programming (Dhp) And Neural Network Based Stochastic Optimization Approach On Collective Robotic Search Problem, Nian Zhang, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

An important application of mobile robots is searching a region to locate the origin of a specific phenomenon. A variety of optimization algorithms can be employed to locate the target source, which has the maximum intensity of the distribution of some detected function. We propose two neural network algorithms: stochastic optimization algorithm and dual heuristic programming (DHP) to solve the collective robotic search problem. Experiments were carried out to investigate the effect of noise and the number of robots on the task performance, as well as the expenses. The experimental results showed that the performance of the dual heuristic programming …

Go to article

Involving Engineering With In-Service K-4 Teachers, Theresa M. Swift, Steve Eugene Watkins, Kristine Swenson, Evalee Lasater, Robert Mitchell Jan 2003

Involving Engineering With In-Service K-4 Teachers, Theresa M. Swift, Steve Eugene Watkins, Kristine Swenson, Evalee Lasater, Robert Mitchell

Electrical and Computer Engineering Faculty Research & Creative Works

A strong workforce in science and engineering and literate citizens in a technology-based society depends on an educational system that prepares students in science, mathematics, and engineering. Unfortunately, many K-12 students lose interest in such topics early in their school years. Engineering applications can capture the imagination of students and illustrate the concepts in science and mathematics. Level-appropriate resources are as necessary for primary teachers and our young scholars as for teachers and students in higher grades. A model for interaction between engineers and K-4 teachers is proposed. The State of Missouri defines curriculum standards in each subject area and …

Go to article

In Vivo And In Vitro Micrografting Of Pistachio, Pistacia Vera L. Cv. "Siirt", Ahmet Onay, Vedat Pi̇ri̇nç, Fi̇li̇z Adiyaman, Çi̇ğdem Işikalan, Engi̇n Ti̇lkat, Davut Başaran Jan 2003

In Vivo And In Vitro Micrografting Of Pistachio, Pistacia Vera L. Cv. "Siirt", Ahmet Onay, Vedat Pi̇ri̇nç, Fi̇li̇z Adiyaman, Çi̇ğdem Işikalan, Engi̇n Ti̇lkat, Davut Başaran

Turkish Journal of Biology

In this study, the success of in vivo and in vitro micrografts of pistachio (Pistacia vera L. cv. "Siirt") materials are presented. The only variable tested was age (1, 5, 10, and 30-year-old trees). Ten- to 12-day-old axenic seedlings germinated in vitro or seedlings (3 to 5 months-old) grown in pots in vivo were used as rootstocks. Shoot tips collected from the four age classes of mature trees of pistachio were the source of scions. Firm contact between the scion and rootstock was assured through the use of parafilm tape at the graft junction for in vivo micrografts. The in …

Go to article

Assessment Of Cartographic Design In Post Wildfire Baer Mapping| A Study Of Fire Logistics Inc., Ira L. Eisen Jan 2003

Assessment Of Cartographic Design In Post Wildfire Baer Mapping| A Study Of Fire Logistics Inc., Ira L. Eisen

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Blackfeet Oral Tradition 1895 Agreement, Jim Kipp Jan 2003

Blackfeet Oral Tradition 1895 Agreement, Jim Kipp

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Brood Emergence 1984| [Poems], Alexander Alviar Jan 2003

Brood Emergence 1984| [Poems], Alexander Alviar

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Bustles, Bows, And Further Frippery| Victorian Costumes For The Nutcracker Ballet, Michele Manis Nokleby Jan 2003

Bustles, Bows, And Further Frippery| Victorian Costumes For The Nutcracker Ballet, Michele Manis Nokleby

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Taking Place: Northern Sea Lion Foraging On Alaska Groundfishery Wastes, Thomas W. Carrels Jan 2003

Taking Place: Northern Sea Lion Foraging On Alaska Groundfishery Wastes, Thomas W. Carrels

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Ancestry Of North America : A Statistical Craniomorphic Comparison Of Paleoindian Skulls, J. Chad Jones Jan 2003

Ancestry Of North America : A Statistical Craniomorphic Comparison Of Paleoindian Skulls, J. Chad Jones

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

A Plan For Success, Barbara A. Kearley Jan 2003

A Plan For Success, Barbara A. Kearley

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Effects Of Fire And Grazing On Breeding Birds In A Mixed-Grass Prairie, Renae A. Schmitt Jan 2003

Effects Of Fire And Grazing On Breeding Birds In A Mixed-Grass Prairie, Renae A. Schmitt

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Physical Chemical And Biological Assessment Of Stoner Creek Watershed Flathead County Montana, Matthew Coen Jan 2003

Physical Chemical And Biological Assessment Of Stoner Creek Watershed Flathead County Montana, Matthew Coen

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Understanding The Spatial Database Of The Multipurpose Gis, Kenneth Eugene Miller Jan 2003

Understanding The Spatial Database Of The Multipurpose Gis, Kenneth Eugene Miller

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

An Enhanced Least-Squares Approach For Reinforcement Learning, Hailin Li, Cihan H. Dagli Jan 2003

An Enhanced Least-Squares Approach For Reinforcement Learning, Hailin Li, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

This paper presents an enhanced least-squares approach for solving reinforcement learning control problems. Model-free least-squares policy iteration (LSPI) method has been successfully used for this learning domain. Although LSPI is a promising algorithm that uses linear approximator architecture to achieve policy optimization in the spirit of Q-learning, it faces challenging issues in terms of the selection of basis functions and training samples. Inspired by orthogonal least-squares regression (OLSR) method for selecting the centers of RBF neural network, we propose a new hybrid learning method. The suggested approach combines LSPI algorithm with OLSR strategy and uses simulation as a tool to …

Go to article

Combining Evolving Neural Network Classifiers Using Bagging, Sunghwan Sohn, Cihan H. Dagli Jan 2003

Combining Evolving Neural Network Classifiers Using Bagging, Sunghwan Sohn, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

The performance of the neural network classifier significantly depends on its architecture and generalization. It is usual to find the proper architecture by trial and error. This is time consuming and may not always find the optimal network. For this reason, we apply genetic algorithms to the automatic generation of neural networks. Many researchers have provided that combining multiple classifiers improves generalization. One of the most effective combining methods is bagging. In bagging, training sets are selected by resampling from the original training set and classifiers trained with these sets are combined by voting. We implement the bagging technique into …

Go to article

Cooperative Cleaning For Distributed Autonomous Robot Systems Using Fuzzy Cognitive Maps, H. Subramanian, Cihan H. Dagli Jan 2003

Cooperative Cleaning For Distributed Autonomous Robot Systems Using Fuzzy Cognitive Maps, H. Subramanian, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

Cooperative Autonomous Cleaning is a simple challenge that can be implemented with the help of Fuzzy Cognitive Maps (FCM) by simulating the actual thinking process of the human. The human mind organizes its thoughts in priorities and this feature could be exploited well if a priori knowledge of the system exists. This technique has been attempted here for a DARS.

Go to article

Emergence And Artificial Life, Nil H. Kilicay, Cihan H. Dagli Jan 2003

Emergence And Artificial Life, Nil H. Kilicay, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

This paper focuses on emergent phenomena and the utilization of computer simulations, basically agent-based modeling to understand emergent phenomena. Agent-based simulation models have a promising future in the social sciences, from management to economies, political science, sociology and anthropology. This paper attempts to realize their full scientific potential by reviewing recent applications in engineering management and addresses the set of challenges confronted by this method. Common methodology for constructing an agent-based model is also discussed with the aim of highlighting how artificial life and management can be brought together to develop decision making aid tools.

Go to article

Web Personalization Using Neuro-Fuzzy Clustering Algorithms, Kartik Menon, Cihan H. Dagli Jan 2003

Web Personalization Using Neuro-Fuzzy Clustering Algorithms, Kartik Menon, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

Different users have different needs from the same web page and hence it is necessary to develop a system which understands the needs and demands of the users. Web server logs have abundant information about the nature of users accessing it. In this paper we discussed how to mine these web server logs for a given period of time using unsupervised and competitive learning algorithm like Kohonen''s self organizing maps (SOM) and interpreting those results using Unified distance Matrix (U-matrix). These algorithms help us in efficiently clustering users based on similar web access patterns and each cluster having users with …

Go to article

Online Instruction Collaboration Project, Michael David Cassens Jan 2003

Online Instruction Collaboration Project, Michael David Cassens

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Go to article

Coolant Pump Drive: An Application For Switched Reluctance Machines, Chris S. Edrington, Babak Fahimi Jan 2003

Coolant Pump Drive: An Application For Switched Reluctance Machines, Chris S. Edrington, Babak Fahimi

Electrical and Computer Engineering Faculty Research & Creative Works

Current vehicle architectures utilize belt driven components such as the coolant pump, air-conditioner, power steering pump etc. However, the trend toward more electric vehicles requires novel applications of machines to replace these inefficient mechanical components. It is essential that electrical machines used in automotive applications be compatible with the corresponding mechanical and electrical terminals. Furthermore, replacement of belt driven components with electrical drives, should be performed as efficient and cost effective as possible. Switched Reluctance Machines (SRM) are both cost effective and very robust to the effects of temperature variation. They also offer a very wide speed range and an …

Go to article

Enhancement Of Output Electric Power In Switched Reluctance Generators, S. Dixon, Babak Fahimi Jan 2003

Enhancement Of Output Electric Power In Switched Reluctance Generators, S. Dixon, Babak Fahimi

Electrical and Computer Engineering Faculty Research & Creative Works

This paper introduces a new switching strategy to increase overall productivity for a switched reluctance generator (SRG). This paper presents the idea of using an intermediate freewheeling mode to boost the magnetizing current without taking additional energy from the DC link. Once the optimal motional back-EMF is established, then both switches will be turned off. Although during the freewheeling process no electricity is generated, by proper timing of each region an overall enhancement in productivity of the SRG is achieved. to demonstrate the practicality of the proposed technique, simulation results are provided. These simulations take into account the switching losses …

Go to article

Million City Traveling Salesman Problem Solution By Divide And Conquer Clustering With Adaptive Resonance Neural Networks, Samuel A. Mulder, Donald C. Wunsch Jan 2003

Million City Traveling Salesman Problem Solution By Divide And Conquer Clustering With Adaptive Resonance Neural Networks, Samuel A. Mulder, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

The Traveling Salesman Problem (TSP) is a very hard optimization problem in the field of operations research. It has been shown to be NP-complete and is an often-used benchmark for new optimization techniques. One of the main challenges with this problem is that standard, non-AI heuristic approaches such as the Lin-Kernighan algorithm (LK) and the chained LK variant are currently very effective and in wide use for the common fully connected, Euclidean variant that is considered here. This paper presents an algorithm that uses adaptive resonance theory (ART) in combination with a variation of the Lin-Kernighan local optimization algorithm to …

Go to article

First Prev Next Last