Consensus in directed networks of multiple agents, as an important topic, has become an active research subject. Over the past several years, some types of consensus problems have been studied. In this paper, we propo...Consensus in directed networks of multiple agents, as an important topic, has become an active research subject. Over the past several years, some types of consensus problems have been studied. In this paper, we propose a novel type of consensus, the generalized consensus （GC）, which includes the traditional consensus, the anti-consensus, and the cluster consensus as its special cases. Based on the Lyapunov＇s direct method and the graph theory, a simple control algorithm is designed to achieve the generalized consensus in a network of agents. Numerical simulations of linear and nonlinear GC are used to verify the effectiveness of the theoretical analysis.展开更多
Compared with traditional consensus,this paper studies the generalized consensus problem for discrete-time multi-agent systems with directed topology and communication delay.Novel distributed consensus protocols with ...Compared with traditional consensus,this paper studies the generalized consensus problem for discrete-time multi-agent systems with directed topology and communication delay.Novel distributed consensus protocols with and without communication delay are designed.Based on the analysis of error dynamical system and graph theory,the generalized consensus is globally asymptotically achieved under suitable conditions without changing the zero row-sums property of Laplacian matrix in networks.Moreover,the sufficient conditions for generalized consensus of communication delay are obtained under directed connections.Finally,some simulations have been provided to verify the theoretical results.展开更多
双向协调加载连接装置是地铁门系统综合检测台架上的重要构件,其强度与刚度十分关键。运用H yper M esh软件对装置模型进行了静力分析。根据分析结果进行尺寸和拓扑两级优化,第一级采用尺寸优化;第二级在第一级的基础上进行拓扑优化,并...双向协调加载连接装置是地铁门系统综合检测台架上的重要构件,其强度与刚度十分关键。运用H yper M esh软件对装置模型进行了静力分析。根据分析结果进行尺寸和拓扑两级优化,第一级采用尺寸优化;第二级在第一级的基础上进行拓扑优化,并对优化后的模型与原模型进行了性能参数对比研究,结果表明:优化后结构不仅满足刚度和强度要求,而且使材料质量减少约49.9%,达到了结构优化设计的目的。展开更多
In the last issue,two case reports separately present examples of the extremely rare and complex congenital heart diseases that show concordant atrioventricular connections to the L-looped ventricles in the presence o...In the last issue,two case reports separately present examples of the extremely rare and complex congenital heart diseases that show concordant atrioventricular connections to the L-looped ventricles in the presence of situs solitus.Both cases highlight that the relationship between the two ventricles within the ventricular mass is not always harmonious with the given atrioventricular connection.Such disharmony between the connections and relationships requires careful assessment of the three basic facets of cardiac building blocks,namely their morphology,the relationship of their component parts,and their connections with the adjacent segments.3D imaging and printing can now facilitate an otherwise difficult diagnosis in such complex situations.Rotation of either the 3D images or the models permit accurate assessment of the ventricular topologic pattern by creating the right ventricular en-face septal view,thus facilitating placement of the observer’s hands.As we now emphasize,an alternative approach,which might prove more attractive to imagers,is to rotate the ventricular mass to provide the ventricular apical view,thus permitting determination of the ventricular relationship without using the hands.展开更多
针对我国首个±1100 k V特高压直流工程(准东—皖南),研究了直流送受端接入系统方案。首先,对于直流送端系统,考虑直流再启动、闭锁等故障对电网的影响,采用直流安全稳定计算标准,从频率和电压稳定性角度研究送端换流站孤岛接入和...针对我国首个±1100 k V特高压直流工程(准东—皖南),研究了直流送受端接入系统方案。首先,对于直流送端系统,考虑直流再启动、闭锁等故障对电网的影响,采用直流安全稳定计算标准,从频率和电压稳定性角度研究送端换流站孤岛接入和联网接入2种方式的可行性。然后,对于直流受端系统,从提高多馈入短路比、抑制短路电流、平衡潮流分布3个层次,研究受端换流站单层接入500 k V、单层接入1000k V、分层接入1000 k V/500 k V这3种方式的可行性。最后,从受端换流站近区网架结构、接入通道选择等多角度研究并提出了换流站的系统接入网架方案。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11002061 and 11202084)the Fundamental Research Funds for the Central Universities,China(Grant No.JUSRP51317B)
文摘Consensus in directed networks of multiple agents, as an important topic, has become an active research subject. Over the past several years, some types of consensus problems have been studied. In this paper, we propose a novel type of consensus, the generalized consensus （GC）, which includes the traditional consensus, the anti-consensus, and the cluster consensus as its special cases. Based on the Lyapunov＇s direct method and the graph theory, a simple control algorithm is designed to achieve the generalized consensus in a network of agents. Numerical simulations of linear and nonlinear GC are used to verify the effectiveness of the theoretical analysis.
基金the National Science Foundation of China under Grant No.61772013the Natural Science Foundation of Jiangsu Province under Grant No.BK20181342。
文摘Compared with traditional consensus,this paper studies the generalized consensus problem for discrete-time multi-agent systems with directed topology and communication delay.Novel distributed consensus protocols with and without communication delay are designed.Based on the analysis of error dynamical system and graph theory,the generalized consensus is globally asymptotically achieved under suitable conditions without changing the zero row-sums property of Laplacian matrix in networks.Moreover,the sufficient conditions for generalized consensus of communication delay are obtained under directed connections.Finally,some simulations have been provided to verify the theoretical results.
文摘双向协调加载连接装置是地铁门系统综合检测台架上的重要构件,其强度与刚度十分关键。运用H yper M esh软件对装置模型进行了静力分析。根据分析结果进行尺寸和拓扑两级优化,第一级采用尺寸优化;第二级在第一级的基础上进行拓扑优化,并对优化后的模型与原模型进行了性能参数对比研究,结果表明:优化后结构不仅满足刚度和强度要求,而且使材料质量减少约49.9%,达到了结构优化设计的目的。
文摘In the last issue,two case reports separately present examples of the extremely rare and complex congenital heart diseases that show concordant atrioventricular connections to the L-looped ventricles in the presence of situs solitus.Both cases highlight that the relationship between the two ventricles within the ventricular mass is not always harmonious with the given atrioventricular connection.Such disharmony between the connections and relationships requires careful assessment of the three basic facets of cardiac building blocks,namely their morphology,the relationship of their component parts,and their connections with the adjacent segments.3D imaging and printing can now facilitate an otherwise difficult diagnosis in such complex situations.Rotation of either the 3D images or the models permit accurate assessment of the ventricular topologic pattern by creating the right ventricular en-face septal view,thus facilitating placement of the observer’s hands.As we now emphasize,an alternative approach,which might prove more attractive to imagers,is to rotate the ventricular mass to provide the ventricular apical view,thus permitting determination of the ventricular relationship without using the hands.
文摘针对我国首个±1100 k V特高压直流工程(准东—皖南),研究了直流送受端接入系统方案。首先,对于直流送端系统,考虑直流再启动、闭锁等故障对电网的影响,采用直流安全稳定计算标准,从频率和电压稳定性角度研究送端换流站孤岛接入和联网接入2种方式的可行性。然后,对于直流受端系统,从提高多馈入短路比、抑制短路电流、平衡潮流分布3个层次,研究受端换流站单层接入500 k V、单层接入1000k V、分层接入1000 k V/500 k V这3种方式的可行性。最后,从受端换流站近区网架结构、接入通道选择等多角度研究并提出了换流站的系统接入网架方案。
