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Fault mode and effect analysis of computer numerical control equipment

Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) 2008年第SUPPL.期38卷 123-125页

作者： Zhang, Ri-Ming Sun, Da-Wen College of Mechanical Science and Engineering Jilin University Changchun 130022 China School Computer Science Northeast Normal University Changchun 130024 China Office of Self-Teaching Education of Jilin Province Changchun 130031 China

The relationships among the itemsets in the fault database of the computer numerical control (CNC) equipments were mined by the method of association rules, the association relationships among the fault causes, the fault modes and the fault sites of the CNC components or systems were obtained and explained in detail providing a valid and simple method for the fault mode and effect analysis (FMEA).

关键词： Machine tools

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On the complexity of consistency and complete state coding for signal transition graphs

On the complexity of consistency and complete state coding f...

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作者： Esparza, Javier Janar, Petr Miller, Alexander Institut für Informatik Technische Universität München Germany Center of Applied Cybernetics Dept. of CS TU Ostrava Czech Republic Institute for Formal Methods in Computer Science Univ. Stuttgart Germany

Signal Transition Graphs (STGs) are a popular formalism for the specification of asynchronous circuits. A necessary condition for the implementability of an STG is the existence of a consistent and complete state encoding. For an important subclass of STGs, the marked graph STGs, we show that checking consistency is polynomial, but checking the existence of a complete state coding is co-NP-complete. In fact, co-NP-completeness already holds for acyclic and 1-bounded marked graph STGs and for live and 1-bounded marked graph STGs. We add some relevant results for free-choice, bounded, and general STGs.

关键词： Petri nets

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Assessing game-themed programming assignments for CS1/2 courses 08

Assessing game-themed programming assignments for CS1/2 cour...

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3rd International Conference on Game Development in computer science Education, GDCSE 2008

作者： Sung, Kelvin Panitz, Michael Rosenberg, Rebecca Anderson, Ruth Computing and Software Systems University of Washington Bothell United States Software Programming Cascadia Community College United States Teaching and Learning Center University of Washington Bothell United States Computer Science and Engineering University of Washington Seattle United States

ISBN: (纸本)9781605580579

We have designed and implemented game-themed programming assignment modules targeted specifically for adoption in existing introductory programming classes. These assignments are self-contained, so that faculty members with no background in graphics/gaming can selectively pick and choose a subset to combine with their own assignments in existing classes. This paper begins with a survey of previous results, followed by a description of the game-themed assignment modules. The paper then focuses on our efforts in assessing the assignments: including details of the procedures and instruments for evaluating student achievement of learning outcomes and attitudes towards the assignments, as well as the extra effort required of faculty to adopt the assignments in existing clases. Copyright 2008 ACM.

关键词： Education computing

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Using Avida-ED for teaching and Learning about Evolution in Undergraduate Introductory Biology Courses

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Evolution: Education and Outreach 2008年第3期2卷 415-428页

作者： Bray Speth, Elena Long, Tammy M. Pennock, Robert T. Ebert-May, Diane Center for Research in College Science Teaching and Learning Michigan State University 270 Plant Biology East Lansing 48824 MI United States Biological Sciences Program Michigan State University East Lansing 48824 MI United States Lyman Briggs College Departments of Philosophy and Computer Science Michigan State University East Lansing 48825 MI United States

Evolution is a complex subject that requires knowledge of basic biological concepts and the ability to connect them across multiple scales of time, space, and biological organization. Avida-ED is a digital evolution educational software environment designed for teaching and learning about evolution and the nature of science in undergraduate biology courses. This study describes our backward design approach to developing an instructional activity using Avida-ED for teaching and learning about evolution in a large-enrollment introductory biology course. Using multiple assessment instruments, we measured student knowledge and understanding of key principles of natural selection before and after instruction on evolution (including the Avida-ED activity). Assessment analysis revealed significant post-instruction learning gains, although certain evolutionary principles (most notably those including genetics concepts, such as the genetic origin of variation) remained particularly difficult for students, even after instruction. Students, however, demonstrated a good grasp of the genetic component of the evolutionary process in the context of a problem on Avida-ED. We propose that: (a) deep understanding of evolution requires complex systems thinking skills, such as connecting concepts across multiple levels of biological organization, and (b) well designed use of Avida-ED holds the potential to help learners build a meaningful and transferable understanding of the evolutionary process. © 2009 Springer science+Business Media, LLC.

关键词： Assessment Avida-ED Complex systems thinking Digital evolution Evolution education Instructional design

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Digital cadcam pedagogy model intelligent inquiry education

Digital cadcam pedagogy model intelligent inquiry education

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28th Annual Conference of the Association for computer Aided Design in Architecture: Silicon + Skin: Biological Processes and Computation, ACADIA 08

作者： Hemsath, Timothy Williams, Robert Bonnstetter, Ronald Soh, Leen-Kiat College of Architecture University of Nebraska-Lincoln United States College of Engineering University of Nebraska-Lincoln United States Teaching Learning and Teacher Education University of Nebraska-Lincoln United States Computer Science and Engineering University of Nebraska-Lincoln United States

ISBN: (纸本)0978946324

Prototypemanufacturing as an educational tool has been very successful at thecollegelevel in architectureandengineering design. This paper discusses an innovative inquiry-based learning approach rather than the problem-based learning models commonly utilized by other similar programs. For example, several research-funded technology projects (e.g., Cappelleri et al. 2007) look at involving students in problem-based learning exercises (e.g., building robots);however, these exercises (while providing valuable experiences) have predetermined outcomes ingrained by the teachers, the project structure, and the components used to construct the devices. Therefore, inquisitive and creative problem solving is limited to the "kit-of-parts" in their approach to solving the problem. The inquiry-based CADCAMpedagogy model is more concerned with the process of solving a problem through the vehicle of prototyping than with the specificity of the design project itself. This approach has great potential. First, the need to solve the problem drives learning on multiple levels, integrating interdisciplinary ideas into the problem and solution. Second, the problem interlocks disciplines through inquiry knowledge building in team exercises. Finally, it encourages diversity and flexibility by allowing students to look at problems from multiples perspectives and points of view.

关键词： Students

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Evolutionary learning by a sensitivity-accuracy approach for multi-class problems

Evolutionary learning by a sensitivity-accuracy approach for...

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Congress on Evolutionary Computation

作者： F.J. Martinez-Estudillo P.A. Gutierrez C. Hervas J.C. Fernandez Department of Management and Quantitative Methods ETA Cordoba Spain Department of Computer Science and Numerical Analysis University of Córdoba Cordoba Spain

Performance evaluation is decisive when improving classifiers. Accuracy alone is insufficient because it cannot capture the myriad of contributing factors differentiating the performances of two different classifiers and approaches based on a multi-objective perspective are hindered by the growing of the Pareto optimal front as the number of classes increases. This paper proposes a new approach to deal with multi-class problems based on the accuracy (C) and minimum sensitivity (S) given by the lowest percentage of examples correctly predicted to belong to each class. From this perspective, we compare different fitness functions (accuracy, C , entropy, E , sensitivity, S , and area, A ) in an evolutionary scheme. We also present a two stage evolutionary algorithm with two sequential fitness functions, the entropy for the first step and the area for the second step. This methodology is applied to solve six benchmark classification problems. The two-stage approach obtains promising results and achieves a high classification rate level in the global dataset with an acceptable level of accuracy for each class.

关键词： Classification algorithms Accuracy Sensitivity Artificial neural networks Evolutionary computation Entropy Multilayer perceptrons

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Guidelines for podcast production and use in tertiary education

Guidelines for podcast production and use in tertiary educat...

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25th Annual Conference of the Australasian Society for computers in Learning in Tertiary Education - "Hello? Where are you in the landscape of educational technology?", ASCILITE 2008

作者： O'Donoghue, Michael Hoskin, Alan Bell, Tim University Centre for Teaching and Learning University of Canterbury Private Bag 4800 Christchurch 8140 New Zealand Department of Computer Science and Software Engineering College of Engineering University of Canterbury Private Bag 4800 Christchurch 8140 New Zealand

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Removing XML Data Redundancies by Constraint-Tree-Based Functional Dependencies

Removing XML Data Redundancies by Constraint-Tree-Based Func...

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ISECS International Colloquium on Computing, Communication, Control, and Management, CCCM

作者： Teng Lv Ping Yan Teaching and Research Section of Computer Artillery Academy of PLA Hefei China College of Mathematics and System Science Xinjiang University Urumqi China

XML datasets may contain redundant information due to some anomaly functional dependencies among elements and attributes just as those in relational database schema. This paper proposes a new concept of XML functional dependency based on constraint-tree model. An algorithm is given to remove data redundancies in XML datasets, in which the above new XML functional dependency and dataset itself are together applied.

关键词： XML Communities Redundancy Finite element methods Relational databases computer science Databases

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Parallel FDTD Simulation of Two-Dimensional Frequency Selective Surface

Parallel FDTD Simulation of Two-Dimensional Frequency Select...

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ISECS International Colloquium on Computing, Communication, Control, and Management, CCCM

作者： Min Li Jian Zhou Anchun Xiao Yi Li School of Computer Science and Technology Wuhan University of Science and Technology Wuhan Hubei China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Science and Technology Wuhan Hubei China School of Science Hubei University of Technology Wuhan China Computer Teaching Department of Basic Courses Institute Zhejiang Wanli University Ningbo China

Grid computing is an active field in high-availability computing. This paper focuses on the numerical calculation of two-dimensional frequency selective surface using the finite difference time domain (FDTD) method on grid-enabled cluster. The result of experiment shows that the evaluation via the parallel FDTD is in good agreement with the result obtained via the traditional FDTD method. The parallel FDTD algorithm is correct and reasonable, which can be extended to other periodic structure and finite exciting sources.

关键词： Finite difference methods Time domain analysis Computational modeling Grid computing Electromagnetics Artificial neural networks Periodic structures

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Work in progress - computing and undergraduate engineering: A collaborative process to align computing education with engineering workforce needs (CPACE)

Work in progress - computing and undergraduate engineering: ...

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Frontiers in Education (FIE) Conference

作者： Claudia E. Vergara Mark Urban-Lurain Daina Briedis Neeraj Buch Jeannine LaPrad Louise Paquette Jon Sticklen Thomas F. Wolff Center for Research on College Science Teaching and Learning. MSU USA Instructional Technology Research & Development Division of Science and Mathematics Education College of Natural Science. MSU USA Chemical Engineering and Materials Science. MSU USA Civil and Environmental Engineering. MSU USA CSW USA Math and Computer Science Department. LCC USA Computer Science and Engineering. MSU USA College of Engineering MSU USA

This NSF-funded community-building (CB) project brings together Michigan State University (MSU), Lansing Community College (LCC), and the Corporation for a Skilled Workforce (CSW) to design and implement a process to create a collaboratively defined undergraduate computing education within the engineering and technology fields in alignment with the computational problem-solving abilities needed to transform mid-Michiganpsilas economy and workforce. In this WIP we outline the process we are developing to ensure that a wide variety of stakeholders - business, community leaders and post secondary educators - collaborate to identify workforce computational skills, define how these skills can be integrated across a curriculum, and develop revised curricula that integrate computational problem-solving across engineering departmental courses. By documenting, evaluating and making the process explicit, this process can serve as a model for national efforts to revitalize undergraduate computing education in engineering, and should be extensible to other computing education reform efforts.

关键词： Collaborative work Problem-solving computer science education Business Design engineering Educational institutions Educational programs Educational technology computer science Mirrors

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