检索结果-南通市图书馆

Modified chaotic ant swarm to function optimization

在线全文

学校读者我要写书评

暂无评论

The Journal of china Universities of Posts and telecommunications 2009年第1期16卷 58-63页

作者： LI Yu-ying , WEN Qiao-yan, LI Li-xiang state key laboratory of networking and {4. technology, beijing university of Posts and telecommunications, beijing 100876, china [a]state key laboratory of networking and {4. technology beijing university of Posts and telecommunications beijing 100876 china

The chaotic ant swarm algorithm （CAS） is an optimization algorithm based on swarm intelligence theory, and it is inspired by the chaotic and self-organizing behavior of the ants in nature. Based on the analysis of the properties of the CAS, this article proposes a variation on the CAS called the modified chaotic ant swarm （MCAS）, which employs two novel strategies to significantly improve the performance of the original algorithm. This is achieved by restricting the variables to search ranges and making the global best ant to learn from different ants＇ best information in the end. The simulation of the MCAS on five benchmark functions shows that the MCAS improves the precision of the solution.

关键词： chaotic ant swarm benchmark functions modified chaotic ant swarm swarm intelligence

Automatic composition of information-providing web services based on query rewriting

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2012年第11期55卷 2428-2444页

作者： ZHAO WenFeng,LIU ChuanChang & CHEN JunLiang state key laboratory of networking and {4. technology,beijing university of Posts and telecommunications,beijing 100876,china 1. state key laboratory of networking and {4. technology Beijing University of Posts and Telecommunications Beijing 100876 China

Compared with normal web services,information-providing services have unique features that have seldom been considered in existing research on the automatic composition of web *** this paper,we present a simple,yet well-formed,semantic-based capability model for information-providing web services,which can express such features as not modifying the world state and not requiring all input/output parameters to be supplemented with class information as *** then present a corresponding automatic composition method derived from a query rewriting algorithm,MiniCon,used in the data integration *** method adequately utilizes previous features,enables primitive semantic reasoning,and can generate executable BPEL scripts *** of the method is complementary to traditional search-based *** on a typical type of problem show that the method is usable in practice.

关键词： web services automatic composition query rewriting data integration ontology semantic web

Dynamic weighted random load balancing algorithm for SIP application server

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Journal of china Universities of Posts and telecommunications 2009年第4期16卷 67-70页

作者： TENG Sheng-bo,LIAO Jian-xin,ZHU Xiao-min state key laboratory of networking and {4. technology,beijing university of Posts and telecommunications,beijing 100876,china [a]state key laboratory of networking and {4. technology beijing university of Posts and telecommunications beijing 100876 china

A new load balancing algorithm named dynamic weighed random （DWR） algorithm for the session initiation protocol （SIP） application server cluster is proposed. It uses weighted hashing random algorithm that supports dialog in the SIP protocol to distribute messages. The weight of each server is dynamic adaptive with feedback mechanism. DWR insures that the cluster is balanced, and it performs better than the limited resource vector （LRV） algorithm and minimum sessions first （MSF） algorithm.

关键词： dynamic load balancing weighted random sip application server

Context-aware end-to-end QoS diagnosis and quantitative guarantee based on Bayesian network

在线全文

学校读者我要写书评

暂无评论

The Journal of china Universities of Posts and telecommunications 2010年第6期17卷 106-112页

作者： LIN Xiang-tao,CHNEG Bo,CHEN Jun-liang,QIAO Xiu-quan state key laboratory of networking and {4. technology,beijing university of Posts and telecommunications,beijing 100876,china [a] state key laboratory of networking switching technology Beijing University of Posts telecommunications Beijing 100876 China

To support quality of service （QoS） management on current Internet working with best effort,we bring forth a systematic approach for end-to-end QoS diagnosis and quantitative guarantee. For QoS diagnosis,we take contexts of a service into consideration in a comprehensive way that is realized by exploiting causal relationships between a QoS metric and its contexts with the help of Bayesian network （BN） structure learning. Context discretization algorithm and node ordering algorithm are proposed to facilitate BN structure learning. The QoS metric is diagnosed to be causally related to its causal contexts,and the QoS metric can be quantitatively guaranteed by its causal contexts. For quantitative QoS guarantee,those causal relationships are first modeled quantitatively by BN parameter learning. Then,the QoS metric is guaranteed to certain value with a probability given its causal contexts tuned to suitable values,that is,quantitative QoS guarantee is reached. Simulations with three sequential stages：context discretization,QoS diagnosis and quantitative QoS guarantee,on a peer-to-peer （P2P） network,are discussed and our approach is validated to be effective.

关键词： context context discretization QoS qualitative diagnosis QoS quantitative guarantee Bayesian network

Relaying strategy for peer-to-peer content distribution based on genetic algorithm

在线全文

学校读者我要写书评

暂无评论

The Journal of china Universities of Posts and telecommunications 2010年第2期17卷 85-91页

作者： HE Qian ,MENG Xiang-wu,SHANG Yan-lei,CHEN Jun-liang state key laboratory of networking and {4. technology,beijing university of Posts and telecommunications,beijing 100876,china [a] state key laboratory of networking switching technology Beijing University of Posts telecommunications Beijing 100876 China

This article proposes a cooperative relaying strategy to efficiently utilize the relaying resources of Interact service providers （ISPs）, speedup distribution and save server bandwidth costs. ISPs cooperatively relay for each other, and peers assist in distributing and fetching the content as near as possible. Base on the fluid model, a constrained model is derived to get optimized global distribution performance in the channel-based system with limited relaying resources. The multi-objectives of the model are minimizing the average distribution time and the distribution time of the slowest channel. Genetic algorithm （GA） is designed to solve the optimization problem. The relaying strategy based on GA can be run periodically to update the allocation policy of ISPs. The distribution performance of the relaying strategy is analyzed in the experiments and results show that GA can provide proper solutions for various network topologies.

关键词： content distribution peer-to-peer genetic algorithm cooperative relaying resource allocation

Quantum threshold group signature

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2008年第10期51卷 1505-1514页

作者： YANG YuGuang1,2,3 & WEN QiaoYan4.1 College of Computer Science and technology, beijing university of technology, beijing 100124. china 2 state key laboratory of Integrated Services Network, Xidian university, Xi’an 710071, china 3 state key laboratory of Information Security (Graduate university of Chinese Academy of Sciences), beijing 10004., china 4.state key laboratory of networking and switching technology, beijing university of Posts and Tele-communications, beijing 100876, china College of Computer Science and technology Beijing University of Technology Beijing 100124 China state key laboratory of Integrated Services Network Xidian University Xi’an 710071 China state key laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100049 China state key laboratory of networking and {4. technology Beijing University of Posts and Telecommunications Beijing 100876 China

In most situations, the signer is generally a single person. However, when the message is written on behalf of an organization, a valid message may require the approval or consent of several persons. Threshold signature is a solution to this problem. Generally speaking, as an authority which can be trusted by all members does not exist, a threshold signature scheme without a trusted party appears more attractive. Following some ideas of the classical Shamir’s threshold signature scheme, a quantum threshold group signature one is proposed. In the proposed scheme, only t or more of n persons in the group can generate the group signature and any t-1 or fewer ones cannot do that. In the verification phase, any t or more of n signature receivers can verify the message and any t-1 or fewer receivers cannot verify the validity of the signature.

关键词： threshold quantum signature trusted party quantum cryptography

Threshold quantum secret sharing between multi-party and multi-party

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2008年第9期51卷 1308-1315页

作者： YANG YuGuang1,2,3 & WEN QiaoYan4.1 College of Computer Science and technology,beijing university of technology,beijing 100124.china 2 state key laboratory of Integrated Services Network,Xidian university,Xi’an 710071,china 3 state key laboratory of Information Security (Graduate university of Chinese Academy of Sciences),beijing 10004.,china 4.state key laboratory of networking and switching technology,beijing university of Posts and Tele-communications,beijing 100876,china College of Computer Science and technology Beijing University of Technology Beijing 100124 China state key laboratory of Integrated Services Network Xidian University Xi’an 710071 China state key laboratory of Information Security (Graduate university of Chinese Academy of Sciences) Beijing 100049 China state key laboratory of networking and {4. technology Beijing University of Posts and Telecommunications Beijing 100876 China

A threshold quantum secret sharing (TQSS) scheme between multi-party and multi-party was proposed using a sequence of single photons,which is useful and efficient when the parties of communication are not all present. We described the process of this TQSS scheme and discussed its security. It was shown that entan-glement is not necessary for quantum secret sharing. Moreover,the theoretic effi-ciency was improved to approach 100% as almost all the instances can be used for generating the private key,and each photon can carry one bit of information. This protocol is feasible with the present-day technique.

关键词： threshold quantum secret sharing quantum cryptography single photon multi-party and multi-party

Threshold proxy quantum signature scheme with threshold shared verification

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2008年第8期51卷 1079-1088页

作者： YANG YuGuang1,3,4.& WEN QiaoYan2 1 College of Computer Science and technology,beijing university of technology,beijing 100124.china 2 state key laboratory of networking and switching technology,beijing university of Posts and Tele-communications,beijing 100876,china 3 state key laboratory of Integrated Services Network,Xidian university,Xi’an 710071,china 4.state key laboratory of Information Security(Graduate university of Chinese Academy of Sciences) ,beijing 10004.,china 1. College of Computer Science and technology Beijing University of Technology Beijing 100124 China 3. state key laboratory of Integrated Services Network Xidian University Xi’an 710071 China 4. state key laboratory of Information Security (Graduate university of Chinese Academy of Sciences) Beijing 100049 China 2. state key laboratory of networking and {4. technology Beijing University of Posts and Telecommunications Beijing 100876 China

A threshold proxy quantum signature scheme with threshold shared verification is proposed. An original signer could authorize a group as its proxy signers. Then only t or more of n persons in the proxy group can generate the proxy signature on behalf of the original signer and any t-1 or fewer ones cannot do that. When the proxy signature needs to be verified,any t or more of n persons belonging to the verification group can verify the message and any t-1 or fewer ones cannot verify the validity of the proxy signature.

关键词： quantum signature threshold proxy quantum group signature threshold shared verification

Practical conditions of signal space alignment for generalized MIMO Y channel

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2012年第10期55卷 2171-2182页

作者： SHE JiaJu 1,2,CHEN ShanZhi 1,2,HU Bo 1,WANG YingMin 2 & SU Xin 2 1 state key laboratory of networking and {4. technology,beijing university of Posts and telecommunications,beijing 100876,china 2 state key laboratory of Wireless Mobile Communications,china Academy of telecommunications technology,beijing 100191,china 1. state key laboratory of networking and {4. technology Beijing University of Posts and Telecommunications Beijing 100876 China2. State Key Laboratory of Wireless Mobile Communications China Academy of Telecommunications Technology Beijing 100191 China

This paper proposes a generalization for applications of signal space alignment(SSA) in a generalized multiple input multiple output(MIMO) Y channel with K(K 2) nodes and an intermediate *** on that generalization,a method is introduced to determine the practical conditions for *** first study the generalized MIMO Y channel model with general signal demands;then,the degrees of freedom(DoF) achieved are given and are proved using *** SSA could decrease the number of antennas at the relay,it places new restrictions on the numbers of antennas at the *** then introduce a method to compare the models with and without SSA network coding(SSA-NC),mainly from the perspective of the total number of antennas *** results show that if each node must be able to exchange signals with all others,the model with SSA will definitely use more antennas to supply the same DoF,when K > *** it is not necessary for every node to exchange signals with all others,the comparison can still be made by using the method introduced *** a result,the conditions under which SSA-NC is needed are presented.

关键词： Signal space alignment MIMO Y channel degrees of freedom number of antennas