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检索条件"机构=Computer and Systems Engineering Program"

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Student engagement through mathematical applications in electrical power systems

Student engagement through mathematical applications in elec...

引用

113th Annual ASEE Conference and Exposition, 2006

作者： Osorno, Bruno California State University Northridge United States Department of Electrical and Computer Engineering California State University Northridge United States Electric Power Systems Graduate and Undergraduate Program

Historically, electrical engineering students have been very proficient in the application of mathematics. At California State University we have experienced, recently, a negative shift of mathematical interest and therefore a lack of progress in the understanding of basic concepts that require a strong mathematical background. This problem stems from the lack of mathematical skills and studying habits. One way to solve this problem is to engage our students into the application of mathematics with simple, yet, powerful problems. An assessment of such engagement occurs every week with a quiz that spans the material covered during the previous week and tests some of the mathematical and engineering skills. This paper attempts to show the results of such assessment and the outcome of a class in which such approach was tasted. During this semester we are testing this technique again in a different course. © American Society for engineering Education, 2006.

关键词： Students

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Cooperative defence against DDoS attacks

Cooperative defence against DDoS attacks

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作者： Zhang, Guangsen Parashar, Manish 628 CoRE Department of Electrical and Computer Engineering Rutgers the State University of New Jersey 94 Brett Road Piscataway NJ 08854-8058 Department of Electrical and Computer Engineering Rutgers University Rutgers University Applied Software Systems Laboratory IEEE Computer Society Distinguished Visitor Program ACM

Distributed denial of service (DDoS) attacks on the Internet have become an immediate problem. As DDoS streams do not have common characteristics, currently available intrusion detection systems (IDS) cannot detect them accurately. As a result, defend DDoS attacks based on current available IDS will dramatically affect legitimate traffic. In this paper, we propose a distributed approach to defend against distributed denial of service attacks by coordinating across the Internet. Unlike traditional IDS, we detect and stop DDoS attacks within the intermediate network. In the proposed approach, DDoS defence systems are deployed in the network to detect DDoS attacks independently. A gossip based communication mechanism is used to exchange information about network attacks between these independent detection nodes to aggregate information about the overall network attacks observed. Using the aggregated information, the individual defence nodes have approximate information about global network attacks and can stop them more effectively and accurately. To provide reliable, rapid and widespread dissemination of attack information, the system is built as a peer to peer overlay network on top of the internet. Copyright © 2006, Australian computer Society Inc.

关键词： Security systems

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Pricing for quality of service in high speed packet switched networks

Pricing for quality of service in high speed packet switched...

引用

IEEE Workshop on High Performance Switching and Routing

作者： M.H. Dahshan P.K. Verma Telecommunications Systems Program Electrical and Computer Engineering University of Oklahama Tulsa OK USA

This paper addresses the impact of quality of service on bandwidth requirements and proposes a scheme whereby a service provider can develop compensatory and fair prices for customers with varying QoS under a wide var... 详细信息

关键词： Pricing Quality of service Intelligent networks Packet switching Bandwidth Jitter Traffic control Delay effects Telecommunication switching USA Councils

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Seller Strategies for Dutch Online Auctions

Seller Strategies for Dutch Online Auctions

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： Anas N. AbuLaban Ghassan Z. Qadah Engineering Systems Management Program American University of Sharjah Sharjah UAE Computer Engineering Department American University of Sharjah Sharjah UAE

An online auction is simply defined as a virtual marketplace hosted on the Internet to match buyers and sellers of goods around the globe regardless of the physical limitations of traditional auctions such as geography, presence, time, and space. Online auctions operate different protocols including English, Dutch, First-Price Sealed Bid and Vickrey with different properties for each one of these protocols. This paper reviews the different types of auctions and the strategies proposed in support of buyers and sellers participating in these auctions. Seller strategies for auctions that adopt protocols other than English are then presented. A scheme that integrates a number of strategies suitable for one of the auction types, namely the Dutch auction, is then developed and discussed

关键词： Protocols Geography systems engineering and theory engineering management Time sharing computer systems Genetic algorithms Strategic planning Stochastic processes Web and internet services

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Selection of optimum communication technology for a distributed workgroup

Selection of optimum communication technology for a distribu...

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27th Annual National Conference of the American Society for engineering Management 2006 - Managing Change: Managing People and Technology in a Rapidly Changing World, ASEM 2006

作者： Saraf, A. Baliga, B. Yu, W. Buske, W. Yao, A. MTS Systems Corporation Eden Prairie MN United States Engineering Management Program St. Cloud State University United States Department of Mechanical and Manufacturing Engineering United States Department of Mathematics St. Cloud State University United States Electrical and Computer Engineering St. Cloud State University United States

ISBN: (纸本)9781604237146

Selecting optimum communication technology for a distributed workgroup such as an electric supply cooperative with a number of sub-stations is a challenge. A quantitative approach to evaluate the various communication technologies based on multicriteria is needed to select optimum communication technology. An electric cooperative in Minnesota was used for a case study and the various communication technologies used (frame relay, fiber optic etc) were investigated. Analytical Hierarchy Process for multicriterion was used to select optimum communication technologies between the sub-stations. The analysis showed that for sub-stations within 10 miles of the hub fiber optic was the most preferred form of communication technology. For distances over 10 miles satellite system was the preferred communication technology. Selection of appropriate communication technology improves the efficiency of the distributed workgroup. Substantial savings in communication costs can be achieved by optimizing the communication technology system.

关键词： Fiber optics

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Predicting Probability of Mortality in the Neonatal Intensive Care Unit

Predicting Probability of Mortality in the Neonatal Intensiv...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Dajie Zhou Monique Frize Program of Systems Science University of Ottawa Ottawa ONT Canada Department of Systems and Computer Engineering Carleton University and the School of Information Technology and Engineering University of Ottawa Ottawa ONT Canada

Artificial neural networks can be trained to predict outcomes in a neonatal intensive care unit (NICU). This paper expands on past research and shows that neural networks trained by the maximum likelihood estimation criterion will approximate the `a posteriori probability' of NICU mortality. A gradient ascent method for the weight update of three-layer feed-forward neural networks was derived. The neural networks were trained on NICU data and the results were evaluated by performance measurement techniques, such as the Receiver Operating Characteristic Curve and the Hosmer-Lemeshow test. The resulting models applied as mortality prognostic screening tools are presented

关键词： Pediatrics Neural networks Artificial neural networks Maximum likelihood estimation Measurement Testing Feedforward systems Feedforward neural networks Resource management Cities and towns

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Aircraft maintenance technology education: Integrating asynchronous technology & virtual reality

Aircraft maintenance technology education: Integrating async...

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113th Annual ASEE Conference and Exposition, 2006

作者： Sadasivan, Sajay Vembar, Deepak Stringfellow, Paris Washburn, Carl Duchowski, Andrew Gramopadhye, Anand Cemson University Department of Industrial Engineering Clemson University SC United States Department of Computer Science Clemson University SC United States Greenville Tech United States Aircraft Maintenance Program Greenville Technical College United States Department of Computer Science Clemson University United States Industrial Engineering Department Advanced Technology Systems Laboratory Clemson University SC United States

This paper describes a research program with an objective to develop and implement an interactive virtual reality (VR) model of the aircraft inspection maintenance process for asynchronous delivery. Existing approaches have not been able to mimic accurately the complexity of the aircraft maintenance process, reporting limited transfer capabilities and student preparedness for the workplace. This use of virtual reality technology will enable educators to create and students to experience the complex aircraft maintenance environment in an educational classroom, a setting where it has not yet been successfully created using traditional multimedia-based technologies. This model will emphasize the curriculum development and workplace preparedness needed by modern aircraft maintenance technology for local, state and national audiences. The primary objectives of this research are curriculum enhancement and assessment of VR as a pedagogical tool. This innovative approach is the first effort to extend tested VR technology to the aircraft maintenance technology curriculum in a two-year college. The outcome of this research will lead to the following: an innovative, high-impact model for curriculum application in aircraft maintenance technology for college students and industry employees;an increased workplace pool of aircraft maintenance technicians prepared for the transition from learning to workforce;a program providing the use of VR technology as a pedagogical tool. The successful completion of this effort will fill a state and national need for well-prepared students entering the aircraft maintenance industry and will provide a better understanding of the use of VR as a pedagogical tool. © American Society for engineering Education, 2006.

关键词： Aircraft

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A variable priorities MAC protocol for Broadband Wireless Access with improved channel utilization among stations

A variable priorities MAC protocol for Broadband Wireless Ac...

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International Symposium on Telecommunications

作者： L. F. M. de Moraes P. D. Maciel Systems Engineering and Computer Science Program-COPPE/UFRJ High-Speed Networks Laboratory-RAVEL Rio de Janeiro Brazil

The Broadband Wireless Access (BWA) technology has been proposed to support different traffic classes with distinct quality of service (QoS) requirements in broadband metropolitan area networks. Therefore, as part of its specifications, such a system must properly address the combined requirements of wireless communications and multimedia applications. We propose in this paper an extension to the MAC protocol presented in [1, 2], by assigning variable priorities to the network stations sharing access to the communication channel. An analytical model to evaluate the performance of the proposed protocol is also developed and results obtained for the messages waiting times at different stations are presented. In addition, simulation data are used to compare the results obtained from the analytical model presented previously. It is concluded that the proposed variable priority MAC protocol is able to improve channel utilization and provide throughput and queueing delay fairness among the stations in the network.

关键词： Media Access Protocol Wireless application protocol Access protocols Analytical models Quality of service Telecommunication traffic Traffic control Metropolitan area networks Wireless communication Multimedia communication

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Hybridized Electric Energy Storage systems for Hybrid Electric Vehicles

Hybridized Electric Energy Storage Systems for Hybrid Electr...

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IEEE Conference on Vehicle Power and Propulsion (VPPC)

作者： David Hoelscher Alex Skorcz Yimin Gao Mehrdad Ehsani Advanced Vehicle Systems Research Program Department of Electrical and Computer Engineering College Station Texas A and M University TX USA

Batteries and ultracapacitors have significantly different energy storage and power delivery capabilities. Electrical traction motors in hybrid electric vehicles have characteristic power and energy demands, and a single energy storage technology may not be optimized to meet both the minimum power and energy demands. In this paper, we investigate the effect of combining batteries and ultracapacitors, both actively and passively, to produce a more versatile electrical energy storage system for hybrid electric vehicles. Hybridized energy storage systems result in increased component life cycles, decreased internal resistance losses, and reduced cost and mass when compared to either battery-only or ultracapacitor-only configurations

关键词： Energy storage Hybrid electric vehicles Supercapacitors Power electronics Voltage Cost function Power demand Battery powered vehicles Intelligent vehicles Traction motors

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Predicting probability of mortality in the neonatal intensive care unit

Predicting probability of mortality in the neonatal intensiv...

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28th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBS'06

作者： Dajie, Zhou Frize, Monique IEEE Program of Systems Science University of Ottawa 800 King Edward Ottawa Ont. K1N 6N5 Canada Department of Systems and Computer Engineering Carleton University University of Ottawa 1125 Colonel By Drive Ottawa Ont. K1S 5B5 Canada

ISBN: (纸本)1424400325

Artificial neural networks can be trained to predict outcomes in a neonatal intensive care unit (NICU). This paper expands on past research and shows that neural networks trained by the maximum likelihood estimation criterion will approximate the 'a posteriori probability' of NICU mortality. A gradient ascent method for the weight update of three-layer feed-forward neural networks was derived. The neural networks were trained on NICU data and the results were evaluated by performance measurement techniques, such as the Receiver Operating Characteristic Curve and the Hosmer-Lemeshow test The resulting models applied as mortality prognostic screening tools are presented. © 2006 IEEE.

关键词： Neonatal monitoring

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