建筑信息模型(building information modeling,BIM)技术作为建筑业实现信息化数字化转型的核心技术,在铁路建设全生命周期中具有很高的研究价值.在铁路通信机械室内、站场、区间设计中,将铁路通信实体的空间位置、形状、大小、关系等空...建筑信息模型(building information modeling,BIM)技术作为建筑业实现信息化数字化转型的核心技术,在铁路建设全生命周期中具有很高的研究价值.在铁路通信机械室内、站场、区间设计中,将铁路通信实体的空间位置、形状、大小、关系等空间形态描述数据化,结合铁路通信设计规范、相关铁路BIM标准以及专业实际设计需求,研究开发出铁路通信数字工程设计系统.本系统以空间形态数据为支撑,铁路工程实体结构分解标准为基础,在三维环境下实现了铁路通信机械室内机柜设备的智能布设,站场通信沟槽线缆的路径规划,区间通信信息点位置的准确布置.系统进一步基于数字工程模型和图论基本原理,实现了从数字工程模型中获取逻辑关系并生成通信逻辑网图.经实际工程验证,系统对铁路通信数字工程设计效率和准确率都有较大提升,从工程源头实现了铁路通信工程数字化成果交付和应用,促进了铁路通信工程项目全过程技术升级和数字化模式革新.展开更多
Clustering in wireless sensor networks is an effective way to save energy and reuse bandwidth. To our best knowledge, most of the clustering protocols proposed in literature are of a dynamic type, where cluster heads ...Clustering in wireless sensor networks is an effective way to save energy and reuse bandwidth. To our best knowledge, most of the clustering protocols proposed in literature are of a dynamic type, where cluster heads are selected in each period, followed by cluster formation. In this paper, a new static type clustering method called Hausdorff clustering, which is based on the location of sensor nodes as well as communication efficiency and network connectivity, is proposed. The cluster head, however, is rotated within the cluster by a fuzzy logic algorithtn that optimizes the network lifetime. Simulation results show that this approach can significantly increase the lifetime of the sensor network.展开更多
A quantum secure direct communication protocol over a collective rotating channel is proposed. The protocol encodes logical bits in noiseless subspaces, and so it can function over a quantum channel subjected to an ar...A quantum secure direct communication protocol over a collective rotating channel is proposed. The protocol encodes logical bits in noiseless subspaces, and so it can function over a quantum channel subjected to an arbitrary degree of collective rotating noise. Although entangled states are used, both the sender and receiver are only required to perform single-particle product measurement or Pauli operations. The protocol is feasible with present-day technique.展开更多
The circuit testable realizations of multiple-valued functions are studied in this letter. First of all,it is shown that one vector detects all skew faults in multiplication modulo circuits or in addi-tion modulo circ...The circuit testable realizations of multiple-valued functions are studied in this letter. First of all,it is shown that one vector detects all skew faults in multiplication modulo circuits or in addi-tion modulo circuits,and n+1 vectors detect all skew faults in the circuit realization of multiple-valued functions with n inputs. Secondly,min(max) bridging fault test sets with n+2 vectors are pre-sented for the circuit realizations of multiple-valued logic functions. Finally,a tree structure is used instead of cascade structure to reduce the delay in the circuit realization,it is shown that three vec-tors are sufficient to detect all single stuck-at faults in the tree structure realization of multiple-valued logic functions.展开更多
An adaptive fuzzy logic controller (AFC) is presented for the signal control of the urban traffic network. The AFC is composed of the signal control system-oriented control level and the signal controller-oriented fuz...An adaptive fuzzy logic controller (AFC) is presented for the signal control of the urban traffic network. The AFC is composed of the signal control system-oriented control level and the signal controller-oriented fuzzy rules regulation level. The control level decides the signal timings in an intersection with a fuzzy logic controller. The regulation level optimizes the fuzzy rules by the Adaptive Rule Module in AFC according to both the system performance index in current control period and the traffic flows in the last one. Consequently the system performances are improved. A weight coefficient controller (WCC) is also developed to describe the interactions of traffic flow among the adjacent intersections. So the AFC combined with the WCC can be applied in a road network for signal timings. Simulations of the AFC on a real traffic scenario have been conducted. Simulation results indicate that the adaptive controller for traffic control shows better performance than the actuated one.展开更多
文摘建筑信息模型(building information modeling,BIM)技术作为建筑业实现信息化数字化转型的核心技术,在铁路建设全生命周期中具有很高的研究价值.在铁路通信机械室内、站场、区间设计中,将铁路通信实体的空间位置、形状、大小、关系等空间形态描述数据化,结合铁路通信设计规范、相关铁路BIM标准以及专业实际设计需求,研究开发出铁路通信数字工程设计系统.本系统以空间形态数据为支撑,铁路工程实体结构分解标准为基础,在三维环境下实现了铁路通信机械室内机柜设备的智能布设,站场通信沟槽线缆的路径规划,区间通信信息点位置的准确布置.系统进一步基于数字工程模型和图论基本原理,实现了从数字工程模型中获取逻辑关系并生成通信逻辑网图.经实际工程验证,系统对铁路通信数字工程设计效率和准确率都有较大提升,从工程源头实现了铁路通信工程数字化成果交付和应用,促进了铁路通信工程项目全过程技术升级和数字化模式革新.
基金Supported in part by the National Natural Science Foundation of China (No.60472053)the Natural Science Foundation of Jiangsu Province (No.BK2003055)the Specialized Research Foundation for the Doctoral Pro-gram of Higher Education (20030286017).
文摘Clustering in wireless sensor networks is an effective way to save energy and reuse bandwidth. To our best knowledge, most of the clustering protocols proposed in literature are of a dynamic type, where cluster heads are selected in each period, followed by cluster formation. In this paper, a new static type clustering method called Hausdorff clustering, which is based on the location of sensor nodes as well as communication efficiency and network connectivity, is proposed. The cluster head, however, is rotated within the cluster by a fuzzy logic algorithtn that optimizes the network lifetime. Simulation results show that this approach can significantly increase the lifetime of the sensor network.
基金Supported by National Natural Science Foundation of China under Grant Nos. 60873191, 60903152, and 60821001SRFDP under Grant No. 200800131016+3 种基金Beijing Nova Program under Grant No. 2008B51Key Project of Chinese Ministry of Education under Grant No. 109014China Postdoctoral Science Foundation under Grant No. 20090450018the Beijing Natural Science Foundation under Grant No. 4072020
文摘A quantum secure direct communication protocol over a collective rotating channel is proposed. The protocol encodes logical bits in noiseless subspaces, and so it can function over a quantum channel subjected to an arbitrary degree of collective rotating noise. Although entangled states are used, both the sender and receiver are only required to perform single-particle product measurement or Pauli operations. The protocol is feasible with present-day technique.
基金Supported by the National Natural Science Foundation of China (No.60006002)the Education Department of Guangdong Province of China (No.02019).
文摘The circuit testable realizations of multiple-valued functions are studied in this letter. First of all,it is shown that one vector detects all skew faults in multiplication modulo circuits or in addi-tion modulo circuits,and n+1 vectors detect all skew faults in the circuit realization of multiple-valued functions with n inputs. Secondly,min(max) bridging fault test sets with n+2 vectors are pre-sented for the circuit realizations of multiple-valued logic functions. Finally,a tree structure is used instead of cascade structure to reduce the delay in the circuit realization,it is shown that three vec-tors are sufficient to detect all single stuck-at faults in the tree structure realization of multiple-valued logic functions.
基金National Natural Science Foundation of China (No.60774023)
文摘An adaptive fuzzy logic controller (AFC) is presented for the signal control of the urban traffic network. The AFC is composed of the signal control system-oriented control level and the signal controller-oriented fuzzy rules regulation level. The control level decides the signal timings in an intersection with a fuzzy logic controller. The regulation level optimizes the fuzzy rules by the Adaptive Rule Module in AFC according to both the system performance index in current control period and the traffic flows in the last one. Consequently the system performances are improved. A weight coefficient controller (WCC) is also developed to describe the interactions of traffic flow among the adjacent intersections. So the AFC combined with the WCC can be applied in a road network for signal timings. Simulations of the AFC on a real traffic scenario have been conducted. Simulation results indicate that the adaptive controller for traffic control shows better performance than the actuated one.
