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共 36 条记录，以下是21-30 订阅

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data Update Consistency Control Based on P2P Network in Product Collaborative design Environment

Data Update Consistency Control Based on P2P Network in Prod...

引用

2009 2nd IEEE International Conference on Computer Science and Information technology(第二届计算机科学与信息技术国际会议 ICCSIT2009)

作者： Pengfei Zeng Yongping Hao Weiping Shao Yongxian Liu R&D Center of CAD/CAM Technology Shenyang Ligong University Shenyang China School of Mechanical Engineering & Automation Northeastern University Shenyang China

In order to meet the needs of product collaborative design, a method of data update consistency control was presented based on Peer-to-Peer (P2P) network technology. The data consistency management mode was established in P2P collaborative design environment, and method of data update control was analyzed among design peers. Through constructing collaborative mode of P2P groups, we realized control mechanism of data update consistency on the basis of the design constraint sets. The proposed approach offered effectively technical support for dynamic data management of design process in distributed collaborative environment.

关键词： product collaborative design consistency control P2P network data update constraint sets

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Failure analysis and simulation for micro-cantilever

Failure analysis and simulation for micro-cantilever

引用

4th International Symposium on Precision Mechanical Measurements

作者： Liu, Fengli Hao, Yongping R and D Center CAD/CAM Technology Shenyang Ligong University Shenyang China

Micro-cantilever structure is flexible and liable to be destroyed compared its volume with its area. Failure mode and effect analysis can be predicted at an early stage of the micro-beam design. Stiction is a main failure mode for cantilever in its manufacture process and operation. Under the load shock, if the contact length reached the limit length, the restoration energy in micro-cantilever couldn't resist the stiction energy, the micro-cantilever would stiction on the substrate. Pull-in was a main failure mode for electrostatic micro-cantilever. The pull-in voltage was obtained by mechanical and electrical couple analysis on the base of the FEM model. © 2008 SPIE.

关键词： Stiction

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Study of multi-agent task model based on product structure breakdown

Study of multi-agent task model based on product structure b...

引用

International Conference on Information technology: New Generations, ITNG 2008

作者： Hao, Yongping Zeng, Pengfei Shao, Weiping R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang 110168 China

ISBN: (纸本)0769530990

From the view of task modeling of project process in Product data Management (PdM) system, a User-Task Allocation Model is put forward based-on product breakdown structure for distributed collaborative product design. The constraints model of function mapping was established between product structure and task breakdown structure. The Colored Petri Net was introduced into PdM system as the modeling tool to realize product structure model- driven project task management mode and to execute dynamic visible design task scheduling. It is explored to apply Multi-agent system to carry out intelligent task management and dispatching. The Agent communication and task dispatching framework were implemented. © 2008 IEEE.

关键词： Multi agent systems

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An adaptive multidisciplinary integration framework for mechatronic systems collaborative design

An adaptive multidisciplinary integration framework for mech...

引用

2008 IEEE/ASME International Conference on Mechatronics and Embedded Systems and Applications, MESA 2008

作者： Pengfei, Zeng Yongxian, Liu Yongping, Hao School of Mechanical Engineering and Automation Northeastern University China R and D Center of CAD/CAM Technology Shenyang Ligong University China School of Mechanical Engineering and Automation Northeastern University Shenyang 110004 China R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang 110168 China

ISBN: (纸本)9781424423682

To meet the needs of complex mechatronic systems development, a scalable adaptive integration architecture was established to supporting multidisciplinary collaborative design. Via the framework requirements analysis, the six hierarchies' functional structures were put forward, and key technologies development was addressed. The collaborative design and multidisciplinary optimization environment was realized, task execution process modeling syntax of group cooperation was achieved. data multi-views consistency management was carried out over the collaborative process, and knowledge process management was implemented. Heterogeneous cross-platform and scalable application tools integration, resources sharing and interoperability were realized. The prototyping system was developed, in Web environment, and application experiences were also fulfilled. The service-oriented adaptive integration framework effectively supported multidisciplinary collaborative design under network environment. © 2008 IEEE.

关键词： Integration

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High G Piezoresistive Micro-accelerometer design and Analysis

High G Piezoresistive Micro-accelerometer Design and Analysi...

引用

中国微米纳米技术学会第十届学术年会暨第一届国际会议(1st International Conference of the Chinese Society of Micro/Nano technology)

作者： Liu Fengli Hao Yongping R&D Center of CAD/CAM technology Shenyang Ligong University Shenyang LiaoningChina

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Graph transformations for the specification of access control in workflow

Graph transformations for the specification of access contro...

引用

2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008

作者： Yonghe, Wei Chengen, Wang Wuliang, Peng R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang China MOE Key Laboratory for Process Institute Automation Northeastern University Shenyang China Scholl of Economic and Trade Management Shenyang Ligong University Shenyang China

ISBN: (纸本)9781424421084

The administration of access control in a organization is a complex task. To ensure that tasks constituting the business processes are performed by authorized users, a proper access control mechanism is required. Graph Transformations provide a uniform and precise framework for the specification of access control policies. After reviewing the basic notations of graph transformation, this article presents specification formalisms for workflow access control policies using graph transformation. The proposed formalization provides an intuitive description for the manipulation of graph structures as they occur in workflow access control and a precise specification of consistency conditions on graphs and graph transformations. In this paper we specifies a type graph to represents the type information in the graph transformation for workflow access control, a set of rules to build the system states and sets of positive and negative constraints to specify wanted and unwanted framework. Using termination which a formal properties of graph transformation we discuss the reachable of workflow authorization. © 2008 IEEE.

关键词： Specifications

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A delegation-based workflow access control model

A delegation-based workflow access control model

引用

1st International Symposium on data, Privacy, and E-Commerce, ISdPE 2007

作者： Wei, Yonghe Shu, Quin R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang 110168 China School of Mechanical Engineering and Automation Northeastern University Shenyang 110004 China

ISBN: (纸本)0769530168

With the progress of enterprise globalization and the development of combination and differentiation in enterprise business, organizations become more dynamic, and business processes are frequently changing. As a result, workflow access control turns more complicated. To solve this problem, in view of decoupling the workflow access control model from the process model, a delegation-based workflow access control (dBWAC) model is presented. This paper proposes the concept of virtual delegator (Vd) in order to manage the permissions involved in a task of a process. In dBWAC, permissions are associated with Vd. Vd can delegate its permissions to a user who can carry out a task that the Vd is associated with. And when the user is out of task, permissions can be revocation. The elements of the dBWAC model are described and the main idea, delegation and revocation policies of the dBWAC model are discussed respectively. © 2007 IEEE.

关键词： Access control models

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A Fault Simulation for the MEMS Gyro

A Fault Simulation for the MEMS Gyro

引用

2007国际机械工程与力学会议

作者： Fengli LIU Yongping HAO Lianxing GAO Department of R&D Center of CAD/CAM technology Shenyang Ligong University Department of Engineering Institute Shenyang Agriculture University

The fault analyze for MEMS gyro is a crucial phase in the gyro design follow. When it is applied in the critical system, it is often causes huge damage once the gyro fails. If the potential failure mode and effect can be predicted at an early stage of the MEMS gyro design, it will decrease the design cost greatly. For gyro structure is flexible and liable to be destroyed compared its volume with its area. The structure susceptible to outside force and be defected in the manufacture process and usage. Gyro is mainly composed of typical structures such as comb diver, parallel plate capacitor and cantilever. So the fault simulation focus in plate crack, broken cantilever that are always happen in the manufacture and usage process. One major cause of faulty behavior in MEMS is due to particulate contaminations especially located between the fix and the movable comb. So analysis is restricted to fault simulation in system level and components level for the typical structures and relies on integrating qualitative failure analysis and quantitative fault simulation.

关键词： MEMS reliability Simulation crack

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A Grouped Network Video Conference System Based on JMF in Collaborative design Environment

A Grouped Network Video Conference System Based on JMF in Co...

引用

International IEEE Conference on Signal-Image Technologies and Internet-Based System

作者： Pengfei Zeng Yongping Hao Yubin Song Yongxian Liu R&D Center of CAD/CAM Technology Shenyang Ligong University Shenyang China Sch. of Mech. Engineering & Automation Northeastern University Shenyang China

Based on requirement of real-time network video conference for computer supported collaborative product design in Web environment, a pure software multi-user video conference system of the similarity B/S structure was developed. JMF (Java media framework) was adopted to achieve system development. Transmission and control of multimedia data were implemented by the streaming media technology of transport and control in conference process. By way of using real-time transport protocol (rTP) and real-time transport control protocol (rTCP), the performance and quality of conference data streams were dynamic monitored. Streaming media reception and send services of conference process were achieved by programming mechanisms of JMF rTP. Based-on Java Bean, Servlet and Applet program design languages, the system framework and client browser program design were completed, integration with product data management (PdM) system was implemented. The system provides a multimedia supporting platform for knowledge exchange and sharing in collaborative design process.

关键词： Streaming media Media Collaboration Multimedia communication Protocols Java real time systems

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Polysilicon comb micrp-accelerometer system design and FEM simulation

Polysilicon comb micrp-accelerometer system design and FEM s...

引用

Sixth International Symposium on Instrumentation and Control technology: Sensors, Automatic Measurement, Control and Computer Simulation

作者： Liu, Fengli Gao, Lianxing Hao, Yongping Zeng, Pengfei Engineering Institute Shenyang Agriculture University R and D Center of CAD/CAM Technology Shenyang Ligong University

ISBN: (纸本)0819464538

Polysilicon Comb Micro-accelerometer is one of the most common MEMS (MicroElectroMechanical System) devices. In the comb micro-accelerometer design, the parameters of the folded beams are key factors to improve the performance and ensure the reliability. In the system design of CoventorWare, the width and length of the folded beams are varied and the corresponding resonant frequencies and mechanical behaviors are respectively discussed. The optimized parameters can be obtained and varied from the FEM analysis. The optimized results ensure that the frequency of the detect mode is lower than the other mode's frequencies, so the coupling error are small. The performance of the micro-accelerometer is improved and reliability should be ensured. The micro-accelerometer is sensitive to electrostatic power, which deforms its geometric structure that causes lower function. Through dC Transfer analysis, the pull-in voltage is checked and the whole system reliability is ensured by corresponding electrostatic spring softening analysis.

关键词： Microelectromechanical devices

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