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2000 ASEE Annual Conference and Exposition: Engineering Education Beyond the Millenium

作者： Murtagh, Jeanne L. Hamilton Jr., John A. Air Force Institute of Technology Joint Forces Program Office U.S. Air Force Software Prof. Development Program Air Force Institute of Technology Wright-Patterson AFB OH U.S. Army Joint Forces Program Office San Diego CA Naval Postgraduate School

In this paper, we discuss how object-orientation and the industrial standard for software development, "software Lifecycle Processes, IEEE/EIA 12207.0-1996" can be used to enhance the students' design experience in a 400-level course in a software engineering program. Although every phase of the software development lifecycle is important, we have found that the two lifecycle phases which present the greatest challenges in a classroom environment are the software requirements analysis phase and the software design phase. Practical experience with requirements definition is an important part of the software engineering process, but it is beyond the scope of this paper;we shall focus on the latter phase. Furthermore, we claim that students benefit from first developing prof.ciency in the software design phase - before they face the major challenges of the software requirements analysis phase. This design prof.ciency can be developed by employing the industrial evaluation criteria, described in IEEE/EIA 12207, for both the high-level and detailed designs produced by the students. We also recommend that the students work from clear, consistent, and reasonably complete requirements provided by the instructor in the project assignment. It is critical that the students continue beyond the design phase and actually implement, test and document their projects, because some design flaws are not obvious to inexperienced software developers until they attempt to write code based on the flawed design. This paper discusses how we focused on the design phase of software development and encouraged design practices that would be effective for industrial projects, as well as our much smaller academic projects.

关键词： Computer aided instruction

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Solid‐liquid interface of an inductively heated metal sphere

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European Transactions on Electrical Power 1993年第6期3卷 407-414页

作者： Bex, H. Greuel, K. Prof. Dr.-Ing. Hans Bex (1937) VDE VDI IEEE is head of the department of High-Frequency Techniques at the Fachhochschule of Aachen Germany. He received his degrees at the Technical University of Aachen Germany in 1965 and 1969. From 1965 to 1980 he was with the Philips Research Laboratories in Aachen as a research scientist where he was engaged in research on lumped element circulators YIG-filters linear and non-linear microstrip circuits for microwave subsystems. Since 1981 he has been a professor for high-frequency techniques at the Fachhoch-schule Aachen Germany teaching electromagnetics and microwaves. His areas of interest include microwave and millimeter wave integrated circuits and devices non-linear analysis techniques device modelling planar transmission line modelling and electromagnetic field theory applied to isotropic and anisotropic materials. (FH Aachen Abteilung fur Theoretische Nachrichtentechnik und Hochstfrequenztechnik. Eupener Str. 70 D-52066 Aachen T + 492 41/60 09 21 08 Fax + 49 241/60 09 21 91) Dipl.-Ing. Karl Greuel (1960) VDE studied Electrical Engineering at the FH Aachen Germany and got his degree there in 1988. After his study he designed software for industry-furnaces with stored-program controllers at the Otto Junker GmbH. Since 1990 he works at the Datus GmbH for electrical information-systems in software development. (Datus GmbH Abteilung Software-Entwicklung Tempelhofer Str. 4-6 D-52068 Aachen T +49241/1 6802-0 Fax + 492 41/168 02-80)

In this paper inductive melting in a metal sphere is investigated, whereby the temperature dependence of the sample 's most important material parameters is considered. The solid‐liquid interface in the sphere is determined in consideration of heat conduction. The melting process takes place in a vacuum with zero gravity under the influence of a homogeneous, magnetic alternating field. For the numerical solution of the heat conduction equation, homogeneous, isotropic conditions are assumed in discrete toroidal volumes. This approach simplifies, at the same time, the use of Maxwell's equations. Using the method of finite differences, the procedure yields not only the spatial location of the solid‐liquid interface but also the corresponding time and absorbed active power as a function of frequency, radius of the sphere and intensity of the exciting field. And not least, the total required melting time for melting the sphere can be determined. Copyright © 1993 John Wiley & Sons, Ltd.

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