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Distributed fault-tolerant strategy for electric swing system of hybrid excavators under communication errors 被引量:1
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作者 Da-hui GAO Qing-feng WANG Yong LEI 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2017年第7期941-954,共14页
A distributed fault-tolerant strategy for the controller area network based electric swing system of hybrid excavators is proposed to achieve good performance under communication errors based on the adaptive compensat... A distributed fault-tolerant strategy for the controller area network based electric swing system of hybrid excavators is proposed to achieve good performance under communication errors based on the adaptive compensation of the delays and packet dropouts. The adverse impacts of communication errors are effectively reduced by a novel delay compensation scheme, where the feedback signal and the control command are compensated in each control period in the central controller and the swing motor driver, respectively, without requiring additional network bandwidth. The recursive least-squares algorithm with forgetting factor algorithm is employed to identify the time-varying model parameters due to pose variation, and a reverse correction law is embedded into the feedback compensation in consecutive packet dropout scenarios to overcome the impacts of the model error. Simulations and practical experiments are conducted. The results show that the proposed fault-tolerant strategy can effectively reduce the communication-error-induced overshoot and response time variation. 展开更多
关键词 Fault tolerant Delay compensation Controller area network communication errors Electric swing system ofhybrid excavator
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German critical incident reporting system database of prehospital emergency medicine: Analysis of reported communication and medication errors between 2005–2015 被引量:3
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作者 Christian Hohenstein Thomas Fleischmann +3 位作者 Peter Rupp Dorothea Hempel Sophia Wilk Johannes Winning 《World Journal of Emergency Medicine》 CAS 2016年第2期90-96,共7页
BACKGROUND: Communication failure in prehospital emergency medicine can affect patient safety as it does in other areas of medicine as well. We analyzed the database of the critical incident reporting system for preho... BACKGROUND: Communication failure in prehospital emergency medicine can affect patient safety as it does in other areas of medicine as well. We analyzed the database of the critical incident reporting system for prehospital emergency medicine in Germany retrospectively regarding communication errors.METHODS: Experts of prehospital emergency medicine and risk management screened the database for verbal communication failure, non-verbal communication failure and missing communication at all.RESULTS: Between 2005 and 2015, 845 reports were analyzed, of which 247 reports were considered to be related to communication failure. An arbitrary classifi cation resulted in six different kinds: 1) no acknowledgement of a suggestion; 2) medication error; 3) miscommunication with dispatcher; 4) utterance heard/understood improperly; 5) missing information transfer between two persons; and 6) other communication failure.CONCLUSION: Communication defi cits can lead to critical incidents in prehospital emergency medicine and are a very important aspect in patient safety. 展开更多
关键词 Critical incident reporting system Prehospital emergency medicine communication error Medication error
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ROBUSTNESS ANALYSIS OF LEADER-FOLLOWER CONSENSUS 被引量:3
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作者 Jinzhi WANG Ying TAN · Iven MAREELS 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2009年第2期186-206,共21页
In this paper,robustness properties of the leader-follower consensus are considered.Forsimplicity of presentation,the attention is focused on a group of continuous-time first-order dynamicagents with a time-invariant ... In this paper,robustness properties of the leader-follower consensus are considered.Forsimplicity of presentation,the attention is focused on a group of continuous-time first-order dynamicagents with a time-invariant communication topology in the presence of communication errors.In orderto evaluate the robustness of leader-follower consensus,two robustness measures are proposed:the L_2gain of the error vector to the state of the network and the worst case L_2 gain at a node.Althoughthe L_2 gain of the error vector to the state of the network is widely used in robust control design andanalysis,the worst case L_2 gain at a node is less conservative with respect to the number of nodes inthe network.It is thus suggested that the worst case L_2 gain at a node is used when the robustnessof consensus is considered.Theoretical analysis and simulation results show that these two measuresare sensitive to the communication topology.In general,the 'optimal' communication topology thatcan achieve most robust performance with respect to either of the proposed robustness measures isdifficult to characterize and/or obtain.When the in-degree of each follower is one,it is shown thatboth measures reach a minimum when the leader can communicate to each node in the network. 展开更多
关键词 communication errors leader-follower consensus robustness.
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Self-error-rejecting photonic qubit transmission in polarization-spatial modes with linear optical elements
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作者 YuXiao Jiang PengLiang Guo +4 位作者 ChengYan Gao HaiBo Wang Faris Alzahrani Aatef Hobiny FuGuo Deng 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2017年第12期12-18,共7页
We present an original self-error-rejecting photonic qubit transmission scheme for both the polarization and spatial states of photon systems transmitted over collective noise channels. In our scheme, we use simple li... We present an original self-error-rejecting photonic qubit transmission scheme for both the polarization and spatial states of photon systems transmitted over collective noise channels. In our scheme, we use simple linear-optical elements, including half-wave plates, 50:50 beam splitters, and polarization beam splitters, to convert spatial-polarization modes into different time bins. By using postselection in different time bins, the success probability of obtaining the uncorrupted states approaches 1/4 for singlephoton transmission, which is not influenced by the coefficients of noisy channels. Our self-error-rejecting transmission scheme can be generalized to hyperentangled n-photon systems and is useful in practical high-capacity quantum communications with photon systems in two degrees of freedom. 展开更多
关键词 photon transmission error correction collective-noise channel spatial-polarization modes quantum communication
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