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International Conference on Advanced Mechatronic systems (ICAMechS)

作者： YuFeng Chen MengChu Zhou XiaoOu Li School of Electro-Mechanical Engineering Xidian University Xi'an China Key Laboratory of Embedded System and Service Computing Ministry of Education University of Tongji Shanghai China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA Departamento de Computacion CINVESTAVIPN Mexico Distrito Federal Mexico

For Petri net models whose legal reachability spaces are non-convex, one cannot optimally control them by the conjunctions of linear constraints. This work proposes a method to find a set of linear constraints such that each constraint can forbid all first-met bad markings and every legal marking satisfies at least one constraint. Then, the disjunctions of the obtained constraints can make all legal markings reachable and forbid all first-met bad markings, i.e., the controlled net is live and maximally permissive. The work also develops an integer linear programming model to minimize the number of the constraints. Finally, an example is provided to illustrate the proposed method.

关键词： Law Optimal control Vectors Aerospace electronics Petri nets system recovery

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Cross-layer detection for black hole attack in wireless network

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Journal of Computational Information systems 2012年第10期8卷 4101-4109页

作者： Yi, Ping Zhu, Ting Liu, Ning Wu, Yue Li, Jianhua State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China School of Information Security Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Computer Science Binghamton University Binghamton NY 13905 United States

Mobile ad hoc networks (MANETs) are especially vulnerable to attacks for lacking infrastructure and data transfer using wireless communication, especial for denial of service (DoS) attacks. Black hole and gray hole attack are two kinds of denial of service (DoS) attacks and can bring great damage to mobile ad hoc network. This paper demonstrates an adaptive approach to detecting black and gray hole attacks in MANET based on a cross layer design. In network layer, we proposed a path-based method to overhear the next hop's action. In MAC layer, a collision rate reporting system is established to estimate dynamic detecting threshold so as to lower the false positive rate under high network overload. This scheme does not send out extra control packets and saves the system resources of the detecting node. We choose DSR protocol to test the algorithm by ns-2 as simulation tool. The experiment result verifies our theory: the average detection rate is above 90% and the false positive rate is below 10%. Moreover, the adaptive threshold strategy contributes to decrease the false positive rate. © 2011 by Binary Information Press.

关键词： Mobile ad hoc networks

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Ride Comfort Performance of Electric Vehicle Conversion with Active Suspension system

Ride Comfort Performance of Electric Vehicle Conversion with...

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SICE Annual Conference

作者： Saiful Anuar ABU BAKAR Ryosuke MASUDA Hiromu HASHIMOTO Takeshi INABA Hishamuddin JAMALUDDIN Roslan ABD. RAHMAN Pakharuddin MOHD. SAMIN Department of Applied Computer Engineering Department of Mechanical Engineering Tokai University Department of System Dynamics and Control Universiti Teknologi Malaysia Department of Automotive Engineering Universiti Teknologi Malaysia

ISBN: (纸本)9781467322591

This paper presents the investigation on the performance of active suspension system in the electric vehicle (EV) conversion, controlled by the stability augmentation system algorithm [9] and a newly proposed SAS-Skyhook algorithm. The evaluations were done using a validated 7-degrees-freedom (7DOF) of vehicle's ride model. The mathematical modelling of the vehicle model is described. A worst case scenario of random road profiles was considered to evaluate the performance of the active suspension system. The method of subjecting the random road profiles input is also described. It was found that in general, the active suspension improved the EV conversion's ride comfort performance significantly, compared to the passive suspension system. In terms of the comparison between the active suspension system controlled by the SAS and SAS-Skyhook algorithms, the ride comfort performance provided by the SAS-Skyhook algorithm is the most significant.

关键词： Electric Vehicle Conversion Ride Comfort Active Suspension system

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Missing step detection in a high speed micro stepping motor using current feedback

Missing step detection in a high speed micro stepping motor ...

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International Conference on Control, Automation and systems ( ICCAS)

作者： Sung-Wook Moon Young-Jin Kim Yoon-Taek Lim Dong Hwan Kim NID Graduate School Seoul National University of Science and Technology Seoul South Korea Nano Manufacturing Research Center Seoul National University of Science and Technology Seoul South Korea Convex Computer Corporation Seoul South Korea Department of Mechanical System Design Engineering Seoul National University of Science and Technology Seoul South Korea

In this work, new approach of missing step detection without using costly encoder in a micro stepping motor is proposed. For a steeping motor driver, a MOSFET driven H-bridge driver was adopted, and sinusoidal type of current is controlled to implement the micro stepping. Also, in order to investigate the missing step the current flowing the coil which is generated from the operational amplifier was given feedback and the feedback data was analyzed to detect the missing step. As a sequence, the missing step was compensated as much as the amount of the missing steps, yielding the control of the desired micro stepping angle.

关键词： Coils Torque Position control Educational institutions MOSFET circuits Power electronics

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Design and implementation of a dynamic reconfigurable classroom for cooperative learning

Design and implementation of a dynamic reconfigurable classr...

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3rd IEEE International Conference on Intelligent Networking and Collaborativesystems, INCoS 2011

作者： Kondo, Hideki Narahara, Hiroyuki Department of Mechanical Information Science and Technology Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka Japan

ISBN: (纸本)9780769545790

In order to practically examine a new type of class, in which cooperative learning is taken into consideration, we designed and built a classroom. This classroom, in which furniture and a flexible ICT basis are both designed reconfigurable, supports much more complex interactions between learners than in a traditional classroom. Two months' observation of the activities in the classroom shows that many aspects of the reconfigurations have encouraged complex interactions within cooperative learning. © 2011 IEEE.

关键词： Collaboration Cooperative Learning Dynamic Reconfigurable Classroom Dynamic scheduling Education Information science Materials Multicore processing Servers classroom furniture complex interaction computer aided instruction cooperative learning dynamic reconfigurable classroom flexible ICT furniture

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On reference node deployment for precise clock synchronization in smart power grid

On reference node deployment for precise clock synchronizati...

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9th IEEE Int. Conf. on Dependable, Autonomic and Secure Comput., DASC 2011, incl. 9th Int. Conf. on Pervasive Intelligence and Computing, PICom 2011, 9th Int. Symp. on Embedded Computing, EmbeddedCom 2011, 1st Int. Conf. on Cloud and Green Comput.CGC

作者： Chang, Chiu-Ping King, Chung-Ta Chan, Chen-Min Department of Computer Science National Tsing Hua University Hsinchu Taiwan Mechanical and System Engineering Program Institute of Nuclear Energy Research Taoyuan Taiwan

ISBN: (纸本)9780769546124

Cloud computing will play an essential role in smart power grid by providing a cost-efficient, scalable IT platform for the delivery and management of electricity. A key component in the cloud-based smart power grid is the intelligent electronic devices (IEDs), which monitor, control, and protect the power system, and collect data back into the cloud for analysis and management. To maintain proper and robust operations of the power system, the collected data must be time-stamped under a common time reference. This in turn demands that the clocks of the distributed IEDs be synchronized to the required precision. A viable approach is to equip some of the IEDs with the Global Positioning system (GPS) as the time references and use the communication links already existing between the IEDs to synchronize the clocks of those without GPS. The question is, given a set of such references nodes, how to decide whether the clocks of all the IEDs can be synchronized to the required precision. If not, how can one add fewest reference nodes to meet the requirements? This paper addresses these issues and proposes efficient algorithms to solve the problems. © 2011 IEEE.

关键词： Smart power grids

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A strategic evaluation model for knowledge relationship among members in enterprise communities

A strategic evaluation model for knowledge relationship amon...

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IEEE Symposium on computers and Informatics

作者： Haghbin, Fariba Ibrahim, Othman Bin Niaki, Mohammad Reza Attarzadeh Department of Computer Science and Information System Universiti Teknologi Malaysia Johor Bahru Malaysia Department of Mechanical Engineering Universiti Teknologi Malaysia Johor Bahru Malaysia

ISBN: (纸本)9781612846903

With the development of online communities, there has been a dramatic increase in the number of members using Enterprise Communities (ECs) over the past few years. Many join ECs with the objective of sharing their knowledge on the specific issue and seeking relative knowledge from others. Despite the eagerness of sharing knowledge and receiving knowledge through ECs, there is no standard of assessing ones knowledge sharing capabilities and prospects of knowledge sharing in order to get great level of efficiency of knowledge sharing collaboration. This paper developed evaluation model to assess knowledge relationship behavior among ECs members with the aim of Vector Space Model. © 2011 IEEE.

关键词： Vector spaces

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Analysis of feature and welding consideration for metal bellows

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Key engineering Materials 2011年 486卷 225-228页

作者： Wen, Hungjiun Lo, Yulin Chang, Kuo-Hwa Wen, Fuh-Liang Department of Industrial and System Engineering Chung Yuan Christian University Chungli Taoyuan County 32023 Taiwan Department of Mechanical and Computer-Aided Engineering Graduate Institute of Automation and Mechatronics St. John's University Tamsui New Taipei City 25135 Taiwan

The design and process of diaphragms for a welded bellow was studied in this paper, which is a flexible component in a piping system or vacuum equipment. Due to a lot of interactive effects on each procedure in the manufacturing for a welded bellow, furthermore the commercial FEM software ANSYS was used to construct a 3-dimension model for the displacement and modal analysis of bellows in which extensions and natural frequencies as well as mode shapes could be observed. The mechanical feature should be considered at the practical applications, i.e., to avoid the occurrence of resonant phenomena corresponding to pump operations and fluid delivery in a piping system. For the purpose of modeling validation, the axial tensile testing machine implemented the extension experiment for welded bellows. According to the results of simulation and experiment, the difference among them could be easily detected for the feature investigation for a design-oriented systemic analysis on the development of welded bellows. © (2011) Trans Tech Publications, Switzerland.

关键词： Tensile testing

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New PN model of FMS with sequential flexibility of resource allocation 21

New PN model of FMS with sequential flexibility of resource ...

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21st International Conference on Production Research: Innovation in Product and Production, ICPR 2011

作者： Aziz, M.H. Bohez, Erik L.J. Pisuchpen, Roongrat Parnichkun, Manukid Dailey, Mathew N. Saha, Chanchal Industrial System Engineering Asian Institute of Technology Bangkok Thailand Department of Mechanical Engineering Kasetsart University Bangkok Thailand Computer Science and Information Management Asian Institute of Technology Bangkok Thailand

ISBN: (纸本)9783839602935

New Petri Net (PN) model of Flexible Manufacturing system (FMS) with sequential flexibility of servers' allocation was developed to meet customer orders while keeping Work In Process (WIP) at the minimum. Because, increase in flexibility and autonomy is basic requirement for an FMS to meet with ever increasing customer demand and global competition. Net developed in this research works on the principal of routing flexibility or context dependent resource allocation and is classified in literature as "Ordinary/Simple PN" with a property of "not a statically conflict free net", hence, a rule base for transitions firing was developed to resolve conflict among firing transitions, while achieving mentioned objectives. Simulation of the net was conducted and results were compared with existing PN model of FMS without sequential flexibility of servers' allocation. Results showed an increase in production rate with same WIP, while meeting identical customer orders.

关键词： Petri nets

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Speedup Robust Features based unsupervised place recognition for assistive mobile robot

Speedup Robust Features based unsupervised place recognition...

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International Conference on Pattern Analysis and Intelligence Robotics

作者： Karasfi, Babak Hong, Tang Sai Jalalian, Afsaneh Nakhaeinia, Danial Institute of Advanced Technology University Putra Malaysia Selangor Malaysia Department of Mechanical and Manufacturing Engineering Engineering Faculty University Putra Malaysia Selangor Malaysia Department of Computer and Communication System Engineering Engineering Faculty University Putra Malaysia Selangor Malaysia

ISBN: (纸本)9781612844046

Vision Based qualitative localization or in the other word place recognition is an important perceptual problem at the center of several fundamental robot procedures. Place recognition approaches are utilized to solve the global localization problem. These methods are typically performed in a supervised mode. In this paper an appearance-based unsupervised place clustering and recognition algorithm are introduced. This method fuses several image features using Speedup Robust Features (SURF) by agglomerating them into the union form of features inside each place cluster. The number of place clusters can be extracted by investigating the SURF based scene similarity diagram between adjacent images. Experimental results show that this method is robust, accurate, efficient and able to create topological place clusters for solving the global localization problem with acceptable performance by the factor of clustering error and recognition precision. © 2011 IEEE.

关键词： Topology

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