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114th Annual ASEE Conference and Exposition, 2007

作者： Teng, S. Gary Ozelkan, Ertunga Sireli, Yesim Elmore, Karen University of North Carolina Charlotte United States Engineering Management Program Center for Lean Logistics and Engineered Systems University of North Carolina Charlotte United States Department of Engineering Management United States Engineering Management Program University of North Carolina Charlotte United States ASEE IEEE Engineering Management Society Decision Sciences Institute United States ASEM Korea Republic of Marketing Science Institute United States Honor Society of Phi Kappa Phi United States

Due to the changing global business environment, the operations of engineering companies in the U.S. are moving from self sufficient engineering operations toward the integration of various engineering operations, including design, production and manufacturing, logistics, sales, and services, at global locations and companies. The education of future engineers has to reflect this changing trend and demand. systems engineering (SE) discipline provides this critical need of education to handle the increasing demands for systems efficiency, effectiveness, and integration in engineering and business operations. This paper intends to discuss the process in the design of a Bachelor of Science in SE curriculum. The design is based on an analysis of skill requirements in industry under the current global market environment and global supply chain operations. This paper discusses industry needs in skills and demonstrates the match of skills to various SE courses and the completed curriculum design for a Bachelor of Science in SE program. © American Society for engineering Education, 2007.

关键词： systems engineering

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Numerical method for calculating view factor between two surfaces

Numerical method for calculating view factor between two sur...

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Building Simulation 2007, BS 2007

作者： Augusto, Lílian Dobrowolski de Carvalho Giacomet, Bruno Mendes, Nathan Mechanic Engineering Graduate Program Thermal Systems Laboratory Pontifical University Catholic of the Paraná Imaculada Conceição 1155 Curitiba-PR 80215-901 Brazil

Long-wave radiation heat transfer is calculated using a geometrical factor the so-called view factor, which is normally estimated in a simplified way by building simulation programs, especially when there is no information in the literature due to the complexities to solve the double integral which defines the view factor between two surfaces. Analytical solutions are only available in the literature for a restricted number of simple configurations. This simplification on the process may implicate several errors on the evaluation of the internal surface temperatures which can cause discrepancies on the prediction of thermal comfort level and energy consumption, mainly when surfaces present complex geometries, openings (windows and doors) and when there are obstructions between them. In this way, the objective of this work is to present a computational method to determine the view factor between two surfaces considering simple or complex geometries with openings and obstructions, using an algorithm to generate a finiteelement mesh onto surfaces to distinguish viewed/shaded surface areas. The algorithm is fast, memory-efficient, robust and uses constrained and unconstrained Delaunay triangulations. The mesh quality is guaranteed by the use of the Rupert's Delaunay refinement algorithm that avoids undesirable small triangle angles. A comparison with literature data available only for the case of simple configurations (without openings and obstructions) shows the excellent accuracy of the proposed computational method. For those cases, a sensitivity analysis consisting in varying the mesh refinement and the distance between the two surfaces has been performed. The results obtained for some geometries considering openings and obstructions are also presented.

关键词： Numerical methods

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Lampshade game for teaching lean manufacturing

Lampshade game for teaching lean manufacturing

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114th Annual ASEE Conference and Exposition, 2007

作者： Ozelkan, Ertunga Galambosi, Agnes University of North Carolina Charlotte United States Department of Engineering Management Center for Lean Logistics and Engineered Systems University of North Carolina Charlotte United States Mechanical Engineering and Engineering Science Department University of North Carolina Charlotte United States

Implementing lean manufacturing concepts is essential for companies in the manufacturing and service industries to survive in the very competitive global marketplace. A key point is to eliminate waste while delivering value to the customers. Thus, graduates from engineering programs such as manufacturing, industrial and systems engineering and engineering management must be able to focus and apply lean principles as they transition to the industry. The purpose of this paper is to present a new game named the "Lampshade Game" that can be beneficial for teaching lean manufacturing concepts to both undergraduate and graduate students. The Lampshade Game demonstrates the advantages and disadvantages of some of the key lean manufacturing principles (such as customer focus, quality focus, JIT, flexible manufacturing, setup and rework reduction) in comparison to craft and mass manufacturing by manually simulating the production of lampshades for each of the process types. The students form teams, and ideally each team should have a chance to manufacture lampshades using all three forms of manufacturing. The manufacturing performance is gauged and compared by different key performance indicators including inventory levels, total manufacturing cycle time, customer fill rate, and production yield. This paper will describe the game, its objectives and share experiences from a classroom implementation. © American Society for engineering Education, 2007.

关键词： Game theory

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Mobility management with distributed AAA architecture

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International Journal of Network Security 2007年第3期4卷 241-247页

作者： Chang, Lin-Huang Lo, Che-Lin Lo, Jui-Jen Liu, Wei-Ting Yang, Chou-Chen Graduate Institute of Networking and Communication Engineering Chaoyang University of Technology 168 Jifong E. Rd. Wufong Taichung County 413 Taiwan Department of Management Information Systems National Chung Hsing University 250 Kuo Kuang Road Taichung County 413 Taiwan

Mobile IP has been defined by Third Generation Partnership Project 2(3GPP2) to be the mobility solution for the next generation cellular networks. The Mobile IP related issues therefore become important and popular. Mobile IP provides the Mobile Node (MN) the ability of roaming around a foreign domain. An MN needs to register with its Home Agent (HA) through the attached Foreign Agent (FA) when it roams to a foreign domain. If the frequency of MN handoffs is high and the foreign domain is too far from the home domain, the delay of the registration will be significant. The hierarchical foreign agent management is proposed to solve this problem. However, the Gateway Foreign Agent (GFA) will become a bottle-neck when it serves too many MNs. In this paper, we propose a mobility management with distributed architecture to solve the bottleneck problem. We also present some simulation results to support our scheme by using NS2.

关键词： Bottles

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Improving Supply Chain management effectiveness using RFID

Improving Supply Chain Management effectiveness using RFID

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IEEE International Conference on engineering management (EMC)

作者： Ibrahim Al Kattan Taha Al-Khudairi Engineering Systems Management Graduate Program American University of Sharjah Sharjah UAE Department of Computer Engineering American University of Sharjah Sharjah UAE

This paper employs a simulation model of a Supply Chain management (SCM) system. The main objective of this model is to compare two systems, one using Radio Frequency Identification (RFID), versus the existing system of barcodes. A quantitative analysis based on a simulation model is developed and a comparison between the two systems is discussed. The model runs for both systems using ARENA simulation software. The model is tested using real data. Two scenarios have been developed using the simulation model in order to analyze: 1 Total inventory cost of all chains in the SCM both with and without RFID. 2 Customer satisfaction and customers lost for all chains in the SCM with and without RFID. The cost of RFID installation is going down over time. By combining the lower cost of RFID installation with fast scanning, the use of RFID technology in SCM promises to reduce annual total inventory cost and the number of lost customers. As a result, this research has shown that RFID technology could be used to improve the effectiveness and performance of the entire supply chain system.

关键词： Supply chain management Radiofrequency identification Supply chains Costs Inventory management Analytical models Investments Manufacturing Senior members Testing

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Fairness Improvement and Efficient Rerouting in Mobile Ad Hoc Networks

Fairness Improvement and Efficient Rerouting in Mobile Ad Ho...

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IEEE International Conference on Communications (ICC)

作者： N. Ohata Y. Zhang Y. Ji X. Shen Department of Social Systems and Management Graduate School of Systems and Information Engineering University of Tsukuba Japan Department of Electrical and Computer Engineering University of Waterloo Canada

Mobile ad hoc networking allows nodes to form temporary networks and communicate with each other possibly via multiple hops. By using a special node called the gateway, an ad hoc network can be connected to the Internet so that packets generated in the ad hoc network can be relayed to the Internet and vice versa. However, a problem may arise in which the network bandwidth is not used fairly among the nodes. That is, nodes near the gateway may overuse the bandwidth while nodes far away from the gateway scarcely share the bandwidth. Furthermore, if the destination node is located in the same ad hoc domain as the source, existing route selection methods result in high overhead or long routes. Addressing these problems, we propose an efficient tree construction algorithm that constructs a tree structure rooted at the gateway in order to improve the fairness of the bandwidth usage. We also devise a rerouting algorithm that dynamically finds new and better routes for the internal traffic within the same ad hoc domain.

关键词： Mobile ad hoc networks Traffic control Bandwidth Relays Tree data structures Telecommunication traffic Ad hoc networks Wireless networks Mobile computing Personal digital assistants

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A practical identification of the opening-and-closing speed dynamics of an elevator door by adapting the fictitious controller to the data 9

A practical identification of the opening-and-closing speed ...

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2007 9th European Control Conference, ECC 2007

作者： Kaneko, Osamu Miyachi, Makoto Magota, Shizuo Fujii, Takao Kobayashi, Kiyoshi Ohtsubo, Ryo Graduate School of Engineering Science Osaka University Toyonaka Japan Department of Management Sciences Fukui University of Technology Fukui Japan Toshiba Elevator and Building Systems Co. Shinagawa Tokyo Japan

ISBN: (纸本)9783952417386

In the present paper, we consider a practical identification of the opening-and-closing speed dynamics of an elevator door. It is important to obtain the actual state of an elevator door for retaining a safety and quick motion. Thus, an identification of the above dynamics is also one of the most important factors for an effective maintenance. However, it is difficult to obtain the actual parameter because of the fact that there are many cases in which an experiment for the identification spends much time and it is undesirable to use a sufficiently excited signal for the identification. These problems should be solved with practical points of view. From these motivative backgrounds, we provide a facile and fast-track identification method for the opening-and-closing speed dynamics of an elevator door. Since the method we proposed here is based on the adaptation of 'the fictitious controller' off-line, it is possible to obtain relevant parameters with only one-shot experiment data obtained in the usual operation, which also leads to reduce the cost for the maintenance drastically. In order to show the validity of the result, we also give an experimental result on the identification of the opening-and-closing speed dynamics of the door of an elevator. © 2007 EUCA.

关键词： Elevators

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Computational analysis of HVEPS scramjet MHD power generation

Computational analysis of HVEPS scramjet MHD power generatio...

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38th AIAA Plasmadynamics and Lasers Conference

作者： Gotoh, Daiki Takahashi, Toru Fujino, Takayasu Ishikawa, Motoo Lineberry, John T. Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba 305-8573 Japan LyTec LLC Tullahoma TN 37388 United States Department of Engineering Mechanics and Energy Japan AIAA United States

ISBN: (纸本)1563479001

An experimental scramjet driven MHD generator developed under the US AFRL's Hypersonic Vehicle Electric Power System (HVEPS) program as described in Reference 1, has been numerically simulated and analyzed using a three dimensional MHD generator computer code. The three dimensional simulations very good agreement is obtained between the experimental and numerical results in the active MHD region when a scalar electrical conductivity deficit of 81.3% of ideal is imposed on the electrophysical properties. The major power performance loss mechanism identified in the three dimensional simulation is relatively large near electrode voltage drops on the order of 100 Volts with a ratio to the induced MHD voltage from 0.3 to 0.4. The three dimensional flow simulation arrived at by the simulation well characterizes that typical to a scramjet driven MHD generator complete with the embedded shock train. The analysis could not reproduce the very large electrical loss in end power take-off regions as was exhibited in the experimentally measured voltage distributions and detailed calculations of localized phenomena associated with current transport in these end regions is required.

关键词： Magnetohydrodynamic power generation

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Empirical validation of the RCDC and RCDE semantic complexity metrics for object-oriented software

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Journal of Computing and Information Technology 2007年第2期15卷 151-160页

作者： Cox, Glenn W. Gholston, Sampson E. Utley, Dawn R. Etzkorn, Letha H. Gall, Cara Stein Farrington, Phillip A. Fortune, Julie L. Department of Computer Science University of Alabama in Huntsville HuntsvilleAL United States Industrial and Systems Engineering Management Department University of Alabama in Huntsville HuntsvilleAL United States Department of Computer Science Edinboro University of Pennsylvania EdinboroPA United States

The Relative Class Domain Complexity (RCDC) and Relative Class Definition Entropy (RCDE) semantic metrics have been proposed for use as complexity metrics for object-oriented software. These semantic metrics are calculated on a knowledge-based representation of software, following a knowledge-based program understanding examination of the software. The metrics have great potential because they can be applied during the software design phase whereas most complexity metrics cannot be applied until after development is complete. In this paper, we present the results of a study to empirically validate the RCDC and RCDE metrics. We show that the metrics compare favorably with the findings of human experts and also that they correlate well with the results of conventional complexity metrics.

关键词： Entropy

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Optimization of broaching design

Optimization of broaching design

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IIE Annual Conference and Expo 2007 - Industrial engineering's Critical Role in a Flat World

作者： Özelkan, Ertunga C. Öztürk, Özkan Budak, Erhan Engineering Management Program Center for Lean Logistics and Engineered Systems University of North Carolina at Charlotte Charlotte NC 28223 United States Department of Mechanical Engineering Center for Precision Metrology University of North Carolina at Charlotte Charlotte NC 28223 United States Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey

Broaching is one of the most recognized machining processes that can yield high productivity and high quality when applied properly. One big disadvantage of broaching is that all process parameters, except cutting speed, are built into the broaching tools. Therefore, it is not possible to modify the cutting conditions during the process once the tool is manufactured. Optimal design of broaching tools has a significant impact to increase the productivity and to obtain high quality products. In this paper, an optimization model for broaching design is presented. The model results in a non-linear non-convex optimization problem. Analysis of the model structure indicates that the model can be decomposed into smaller problems. The model is applied on a turbine disc broaching problem which is considered as one of the most complex broaching operations.

关键词： Machining

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