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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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A neural model for sonar-based navigation in obstacle fields

A neural model for sonar-based navigation in obstacle fields

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： T.K. Horiuchi Institute for Systems Research & The Neuroscience and Cognitive Science Program Electrical and Computer Engineering Department University of Maryland College Park MD USA

The rapid control of sonar-guided vehicles through obstacle fields has been a goal of robotics for decades. How sensory data is represented strongly affects how obstacles and goal information can be combined to select a direction of travel. While typical approaches combine attractive and repulsive effects to directly determine steering, we are investigating an algorithm that evaluates multiple directions simultaneously followed by a winner-take-all (WTA) function which then guides steering. In this paper we describe a neuromorphic VLSI implementation of this algorithm using the inherent echo delay to create a range-dependent gain in a 'race-to-first-spike' neural WTA circuit. The chip was fabricated in a commercially-available 0.5 mum CMOS process and in this paper we present preliminary test results

关键词： Sonar navigation Robot sensing systems Neurons Automotive engineering Neuroscience Cognitive science Educational institutions Control systems Vehicles Cognitive robotics

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New class of cryptographic primitives and cipher design for networks security

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International Journal of Network Security 2006年第2期2卷 114-125页

作者： Moldovyan, Nikolay A. Moldovyan, Alexander A. Eremeev, Michael A. Sklavos, Nicolas Specialized Center of Program Systems SPECTR Kantemirovskaya Str. 10 St. Petersburg 197342 Russia Electrical and Computer Engineering Department University of Patras Greece

This work focuses the problem of increasing the integral implementation efficacy of block ciphers. It proposes a new approach to the cipher design, suitable to applications, where constrained resources are available to embedded security mechanisms, such as ad-hoc, sensor and wireless networks. The paper develops the cipher design approach based on the use of datadependent (DD) operations (DDOs). A new class of DDO based on the advanced controlled elements (CEs) is introduced, which is proven well suited to hardware implementations, for ASIC and FPGA devices. Classification of the CEs and properties of some new DDOs are also presented. A new DDO-based cipher design is considered, which is more efficient for VLSI implementation than AES finalists and other known DDO-based ciphers. For the proposed cipher, Eagle-128, both ASIC and FPGA implementation results are presented. Finally comparisons with other published implementations are illustrated, using the Performance/Cost ratio and Performance/(Cost*Frequency) ratio indices.

关键词： Network security

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A Systematic Review of Cross- vs. Within-Company Cost Estimation Studies 10

A Systematic Review of Cross- vs. Within-Company Cost Estima...

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10th International Conference on Evaluation and Assessment in Software engineering, EASE 2006

作者： Kitchenham, Barbara Mendes, Emilia Travassos, Guilherme H. Department of Computer Science Keele University StaffordshireST5 5GB United Kingdom National ICT Australia Locked Bag 9013 AlexandriaNSW1435 Australia Computer Science Department The University of Auckland Private Bag 92019 Auckland New Zealand UFRJ/COPPE Systems Engineering and Computer Science Program Caixa Postal 68511 RJ Rio de Janeiro21941-972 Brazil

OBJECTIVE – The objective of this paper is to determine under what circumstances individual organisations would be able to rely on cross-company based estimation models. METHOD – We performed a systematic review of studies that compared predictions from cross-company models with predictions from within-company models based on analysis of project data. RESULTS – Ten papers compared cross-company and within-company estimation models, however, only seven of the papers presented independent results. Of those seven, three found that cross-company models were as good as within-company models, four found cross-company models were significantly worse than within-company models. Experimental procedures used by the studies differed making it impossible to undertake formal meta-analysis of the results. The main trend distinguishing study results was that studies with small single company data sets (i.e. © EASE *** rights reserved.

关键词： Cost estimating

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Communications infrastructure generation for modular FPGA reconfiguration

Communications infrastructure generation for modular FPGA re...

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IEEE International Conference on Field-programmable Technology (FPT)

作者： Shannon Koh Oliver Diessel School of Computer Science and Engineering University of New South Wales Sydney Australia Embedded Real-Time and Operation Systems (ERTOS) Program NICTA Australia

Modules that are swapped dynamically at run-time on an FPGA have varying communication needs over time. In order to support this, we aim to generate a wiring infrastructure that caters for the dynamically-changing module interfaces. This, however, imposes a regular structure for laying out modules on a device, which may result in longer inter-module wiring paths as compared to traditional methods where the netlists are flattened. This paper studies placing modules within a structured layout to compare resulting circuit speeds with those obtained by traditional methods. Our results indicate that the difference in critical path delay is high at very low utilisation, but that the overhead is absorbed as the number of modules and interconnection density increases to realistic levels. The authors conclude that implementing such a wiring infrastructure has manageable overheads while having the added advantage of being amenable to dynamic reconfiguration

关键词： Field programmable gate arrays Wiring Australia Runtime Circuits Logic devices Reconfigurable logic computer science Real time systems Operating systems

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