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浏览/检索结果: 共11条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Analysis on the influence of random vibration on MEMS gyro precision and error compensation (EI CONFERENCE) 会议论文  OAI收割 2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China 作者:  Li M. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 In order to improve its precision in dynamic environment  a Kalman filter was designed. Firstly  two sets of random drift data of MEMS gyro were respectively analysed  and it was found that the variance of random drift under random vibration significantly increased and its mean also changed. Then calculation results show that attitude angle error under random vibration is 2.6  while in the static test it is 0.25. Analysis on the characteristics of random drift was carried out  and it is found that it can be treated as stable  normally distributed random signal. Finally  a corresponding Kalman filter was designed. The results indicated that after filtering the variance of random drift is reduced to 0.0282  26.4% of pre-filtering and the attitude angle error is reduced to 1.5  57.7% of pre-filtering. The above method can effectively compensate for the attitude angle error of MEMS gyro caused by random vibration. This study can be a reference to the application of low-cost MEMS gyro in aircraft navigation. (2012) Trans Tech Publications  Switzerland.   An intelligent video surveillance system (EI CONFERENCE) 会议论文  OAI收割 2010 International Conference on E-Product E-Service and E-Entertainment, ICEEE2010, November 7, 2010 - November 9, 2010, Henan, China Gao S. 收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25 This paper presents an intelligent video surveillance system. The system is composed of one or more nodes flexibly according to the application scenarios such as private properties  banks and museums. Each node is an autonomous vision-based device capable to perform intelligent tasks. It is able to digitize and compress the acquired analog video signals in MPEG-4 standard and then transmit the compressed video stream to the control center. At the same time  the node makes use of a statistical approach for real-time detecting moving object and online alarm generation to enable a single human operator to monitor activities over a complex area using a distributed network of active video sensors. The node is implemented on a platform with high performance to ensure that the algorithm is able to run in real-time. Applications demonstrate that the intelligent system has an excellent performance in many scenarios to help people make decisions more accurately and rapidly. 2010 IEEE.   Configuring an electrostatic membrane reflector with potentials exerted on distributed electrodes (EI CONFERENCE) 会议论文  OAI收割 2009 IEEE International Conference on Mechatronics and Automation, ICMA 2009, August 9, 2009 - August 12, 2009, Changchun, China 作者:  Zhang P.;  Shi G. 收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25 Electrostatic membrane reflector (EMR) is very promised for optical quality application with the merits of utra-lightweight and flexible. Configuring a circular membrane reflector with electrostatic potentials exerted on distributed electrodes can approximatively produce a parabolic shape. A 300mm EMR (made from polyimide) stretched by distributed electrodes below is designed  and the number of concentric electrodes needed for membrane shape forming is analysed. First  based on an analytical solution of Poisson's equation  determine the membrane control matrix by finding influence functions of 3 concentric electrodes and 6 control points on membrane surface in order to compute the needed voltages exerted on the distributed electrodes by the method of least-squares fitting. Then the final shape solved by finite element analysis with ANSYS is contrasted with the paraboloid and deviates greatly when the central displacement of membrane is beyond 2.5mm  but in this range increasing the number of electrodes and control points will get a better shape. The corresponding errors are analyzed  and the control method is concluded. Only using the integrated method of analytical computation  numerical analysis and experiment  the membrane shape of certain central displacement can be exactly predicted and controlled. 2009 IEEE.   combining replication with transaction processing for enhanced reliability in j2ee 会议论文  OAI收割 17th International Symposium on Software Reliability Engineering, Raleigh, NC, NOV 07-10, Zuo Lin; Liu Shaohua; Wei Jun   |  收藏  |  浏览/下载：16/0  |  提交时间：2011/07/28 Internet  Intranet  J2EE  business processing  client request  distributed application development  end-to-end reliability guarantee  exactly-once semantics  fault-tolerant algorithm  multitier architecture  replication  software reliability  transaction processing  I   a fault-tolerant scheme for complex transaction patterns in j2ee 会议论文  OAI收割 10th IEEE International Enterprise Distributed Object Computing Conference, Hong Kong, PEOPLES R CHINA, OCT 16-20, Zuo Lin; Liu Shaohua; Wei Jun   |  收藏  |  浏览/下载：23/0  |  提交时间：2011/07/28 2PC protocol  J2EE application server  OnceAS  backward error recovery  blocking problem  complex transaction patterns  distributed transactions processing  end-to-end reliability  fault-tolerant scheme  forward error recovery  large-scale distributed enterprise ap   combining replication with transaction processing for enhanced reliability in j2ee 会议论文  OAI收割 17th International Symposium on Software Reliability Engineering, Raleigh, NC, NOV 07-10, Zuo Lin; Liu Shaohua; Wei Jun   |  收藏  |  浏览/下载：24/0  |  提交时间：2011/07/28 Internet  Intranet  J2EE  business processing  client request  distributed application development  end-to-end reliability guarantee  exactly-once semantics  fault-tolerant algorithm  multitier architecture  replication  software reliability  transaction processing  I   a fault-tolerant scheme for complex transaction patterns in j2ee 会议论文  OAI收割 10th IEEE International Enterprise Distributed Object Computing Conference, Hong Kong, PEOPLES R CHINA, OCT 16-20, Zuo Lin; Liu Shaohua; Wei Jun   |  收藏  |  浏览/下载：20/0  |  提交时间：2011/07/28 2PC protocol  J2EE application server  OnceAS  backward error recovery  blocking problem  complex transaction patterns  distributed transactions processing  end-to-end reliability  fault-tolerant scheme  forward error recovery  large-scale distributed enterprise ap   a qos-enable failure detection framework for me application server 会议论文  OAI收割 International Symposium on Autonomous Decentralized Systems (ISADS 2005), Chengdu, PEOPLES R CHINA, APR 04-08, Chen NJ; Wei J; Yang B; Wang JL; Huang T   |  收藏  |  浏览/下载：19/0  |  提交时间：2011/07/28 J2EE application server  OnceAS application server  QoS-enable failure detection  Web computing  distributed system  quality of service  runtime system  Java  computer network reliability  distributed processing  middleware  network servers  quality of se   conformance test of distributed transaction service 会议论文  OAI收割 12th Asian Test Symposium, XIAN, PEOPLES R CHINA, NOV 16-19, Xu C; Jin BH   |  收藏  |  浏览/下载：17/0  |  提交时间：2011/07/29 J2EE application servers  JTA specifications  JTS specifications  Java transaction API  Java transaction service  conformance test  distributed computing environment  distributed transaction manager  distributed transaction service  formal representation   Communication cost of cognitive co-operation for distributed team development 期刊论文  OAI收割 JOURNAL OF SYSTEMS AND SOFTWARE, 2001, 卷号: 57, 期号: 3, 页码: 227-233 作者:  Zhuge, H;  Shi, XQ   |  收藏  |  浏览/下载：20/0  |  提交时间：2019/12/16 cognitive co-operation  communication cost  distributed application  team development  workflow