检索结果-南通市图书馆

On the construction of multi-output Boolean functions with optimal algebraic immunity

在线全文

学校读者我要写书评

暂无评论

science china(Information sciences) 2012年第7期55卷 1617-1623页

作者： ZHANG Jie 1,2 ,SONG ShouChao 1 ,DU Jiao 2,3.& WEN QiaoYan 2 1 school of science,Beijing university of {3. and telecommunications,Beijing 100876,china 2 State Key Laboratory of Networking and Switching technology,Beijing university of {3. and telecommunications,Beijing 100876,china 3.Department of Mathematics,Xinxiang university,Xinxiang 453.03.china 1. school of science Beijing University of Posts and Telecommunications Beijing 100876 China2. State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China3. Department of Mathematics Xinxiang University Xinxiang 453003 China

In this paper,we show a construction of multi-output Boolean functions with optimal algebraic ***,the relationship between the algebraic immunity of a multi-output Boolean function and those of its component functions is *** show that all the component functions,together with their nonzero linear combination,of the multi-output Boolean functions achieved by this construction have optimal algebraic immunity simultaneously.

关键词： algebraic immunity Boolean functions algebraic attacks annihilators

Error exponents for two-hop Gaussian multiple source-destination relay channels

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Information sciences) 2012年第2期55卷 348-359页

作者： DENG PanLiang1,3.LIU YuanAn1,3.XIE Gang2,3.WANG XiaoYu1,3.TANG BiHua1,3.& SUN JianFeng1,3.1school of Electronic Engineering,Beijing university of posts and {3.,Beijing 100876,china 2school of Information and Communication Engineering,Beijing university of posts and {3.,Beijing 100876,china 3.ey Laboratory of Universal Wireless Communication,Ministry of Education,Beijing 100876,china 1. school of Electronic Engineering Beijing University of Posts and Telecommunications Beijing 100876 China3. Key Laboratory of Universal Wireless Communication Ministry of Education Beijing 100876 China2. School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

We investigate the two-hop multiple source-destination relay channels using the rate splitting trans-mission scheme where each source can split its message into private and public *** determine the system error probability via integrated exponent function under amplify-and-forward(AF)and decode-and-forward(DF)relay *** most significant difference between AF and DF system error probability evaluations lies in a minimized cut-set bound of transmission rate under the DF *** are many cases among transmission rate intervals for different system parameters(*** power)and it is extremely complex to derive the system error probability for the DF *** obtain a relatively simple result,which unifies various cases by a few *** results show that the system error probability decreases with the increase of the public ***,in order to draw deep insight into the reliability requirement of each source node in this network,we provide the error exponent region(EER)for different source nodes to show the trade-off of error probability among source nodes.

关键词： error exponent error exponent region rate splitting multiple source-destination relay channel

Quasi-secure quantum dialogue using single photons

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2007年第5期50卷 558-562页

作者： YANG YuGuang1,2 & WEN QiaoYan3. College of computer science and technology, Beijing {3. of technology, Beijing 100022, china 2 State Key Laboratory of Information Security, Graduate {3. of the Chinese Academy of sciences, Beijing 100049, china 3.school of science, Beijing {3. of posts and {13., Beijing 100876, china College of computer science technology Beijing University of Technology Beijing 100022 China State Key Laboratory of Information Security Graduate University of the Chinese Academy of Sciences Beijing 100049 China school of science Beijing University of Posts telecommunications Beijing 100876 China

A quasi-secure quantum dialogue protocol using single photons was proposed. Different from the previous entanglement-based protocols, the present protocol uses batches of single photons which run back and forth between the two parties. A round run for each photon makes the two parties each obtain a classical bit of information. So the efficiency of information transmission can be increased. The present scheme is practical and well within the present-day technology.

关键词： quantum dialogue, single photon, quantum secure direct communication

An efficient quantum secret sharing protocol with orthogonal product states

在线全文

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2007年第3期50卷 331-338页

作者： YANG YuGuang1,2, WEN QiaoYan3.& ZHU FuChen4 1 school of computer, Beijing university of {3., Beijing 100022, china 2 State Key Laboratory of Information Security, Graduate university of Chinese Academy of sciences, Beijing 100022, china 3.school of science, Beijing university of posts and telecommunications, Beijing {13., china 4 National Key Laboratory for Modern Communications, Chengdu 610041, china 1. school of computer Beijing University of Technology Beijing 100022 China 2. State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100022 China 3. school of science Beijing University of Posts and Telecommunications Beijing 100876 China 4. National Key Laboratory for Modern Communications Chengdu 610041 China

An efficient quantum secret sharing protocol with orthogonal product states in the 3.3.Hilbert space is presented. The particles in the orthogonal product states form two particle sequences. One sequence is sent to Bob and the other is sent to Charlie after rearranging the particle orders. With the help of Alice, Bob and Charlie make the corresponding local measurement to obtain the information of the or- thogonal product states prepared. This protocol has many distinct features such as great capacity and high efficiency.

关键词： quantum secret sharing orthogonal product state orthogonal measurement

Influence of magnetic current on the ground state entanglement in an isotropic transverse XY chain

在线全文

学校读者我要写书评

暂无评论

Progress in Natural science:Materials International 2007年第10期17卷 1147-1151页

作者： Liu Dan1,2 , Zhang Yong3.and Long Guilu1,2(1. Key Laboratory for Atomic and Molecular Nanosciences, and Department of Physics, Tsinghua university, Beijing 100084, china 2. Center of Quantum Information science and technology, Tsinghua National Laboratory for information science and technology, Beijing 100084, china 3. Institute of Physics, school of sciences, Beijing university of posts and telecommunications, Beijing {13., china) Key Laboratory for Atomic and Molecular Nanosciences and Department of Physics Tsinghua University Beijing 100084 China Center of Quantum Information science and technology Tsinghua National Laboratory for information Science and Technology Beijing 100084 China Institute of Physics School of Sciences Beijing University of Posts and Telecommunications Beijing 100876 China

We study the ground state entanglement in a three-qubit XY chain under the influence of a magnetization current. It is found that the ground state changes from a W state to a disentangled state as the magnetic field varies. When the Lagrange multiplier λ>3. namely under a strong magnetic current, the ground state holds onto a W state for a large range of the magnetic field strength. A phase transition to the magnetization-current phase occurs under a certain condition.

关键词： Heisenberg-XY chain magnetic-current phase transition.

Secure network coding in the presence of eavesdroppers

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Information sciences) 2010年第3期53卷 648-658页

作者： LUO MingXing1,2,3. YANG YiXian1,2,3. WANG LiCheng1,2,3.& NIU XinXin1,2,3.1Information Security Center, State Key Laboratory of Networking and Switching technology, Beijing university of posts and {3., Beijing 100876, china 2Key Laboratory of Network and Information Attack and Defence technology of MOE, Beijing university of posts and {3., Beijing 100876, china 3.ational Engineering Laboratory for Disaster Backup and Recovery, Beijing university of posts and {3., Beijing 100876, china 1. Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China2. Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China3. National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China

Our concern, in the paper, is to construct information-theoretic secure network coding in the presence of eavesdroppers. Based on the generalized attack model and all-or-nothing transformation, the security of network coding in the generalized combination network can be characterized by the network capacity and the min-cut bound of wiretapping set from the source. Furthermore, it can be extended to any directed acyclic networks with single source. Compared with the traditional results, we construct information-theoretic secure network coding without additional encryptions and giving up any capacity.

关键词： all-or-nothing transformation secure network coding eavesdropping

A Case Study of 3. Protein Structure Prediction with Genetic Algorithm and Tabu Search

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Wuhan university Journal of Natural sciences 2011年第2期16卷 125-129页

作者： WANG Ting1,2, ZHANG Xiaolong1, 3.1. school of computer science and {3., Wuhan university of science and {3., Wuhan 43.065, Hubei, china 2. College of Mobile telecommunications, Chongqing university of posts and telecommunications, Chongqing 400065, china 3. State Key Laboratory of Bioelectronics, Southeast university, Nanjing 210096, china school of computer science and {3. Wuhan University of Science and Technology Wuhan Hubei China College of Mobile telecommunications Chongqing University of Posts and Telecommunications Chongqing China State Key Laboratory of Bioelectronics Southeast University Nanjing China

This paper describes a case study of 3. protein structure prediction of six sequences from protein data bank （PDB） by genetic algorithm and tabu search （GATS）, where off-lattice AB model is considered as a simplified model of protein structure. The lowest-energy values required for forming the native conformation of proteins are searched by GATS, and then the coarse structures （i.e., simplified structure） of the proteins are obtained according to the multiple angle parameters corresponding to the lowest energies. All the coarse structures form single hydrophobic cores surrounded by hydrophilic residues, which stay on the right side of the actual characteristic of protein structure. It demonstrates that this approach can predict the 3. protein structure effectively.

关键词： 3. protein structure off-lattice AB model genetic algorithm and tabu search (GATS)

Multiparty simultaneous quantum identity authentication with secret sharing

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3期51卷 321-327页

作者： YANG YuGuang1,2,WEN QiaoYan3.& ZHANG Xing4,5 1 College of computer science and technology,Beijing {3. of technology,Beijing 100022,china 2 State Key Laboratory of Information Security (Graduate {3. of the Chinese Academy of sciences),Beijing 100049,china 3.school of science,Beijing {3. of posts and {13.,Beijing 100876,china 4 Institute of Electronic technology,Information Engineering {3.,Zhengzhou 450004,china 5 Trusted Computing Laboratory,Beijing {3. of technology,Beijing 100022,china College of computer science technology Beijing University of Technology Beijing 100022 China State Key Laboratory of Information Security [Graduate university of the Chinese Academy of sciences] Beijing 100049 China school of science Beijing University of Posts telecommunications Beijing 100876 China Institute of Electronic technology Information Engineering University Zhengzhou 450004 China Trusted Computing Laboratory Beijing University of Technology Beijing 100022 China

Two multiparty simultaneous quantum identity authentication (MSQIA) protocols based on secret sharing are presented. All the users can be authenticated by a trusted third party (TTP) simultaneously. In the first protocol,the TTP shares a random key K with all the users using quantum secret sharing. The ith share acts as the authentication key of the ith user. When it is necessary to perform MSQIA,the TTP generates a random number R secretly and sends a sequence of single photons encoded with K and R to all the users. According to his share,each user performs the corresponding unitary operations on the single photon sequence sequentially. At last,the TTP can judge whether the impersonator exists. The sec-ond protocol is a modified version with a circular structure. The two protocols can be efficiently used for MSQIA in a network. They are feasible with current technol-ogy.

关键词： quantum identity authentication secret sharing quantum cryptography

Sandwich Magnetoelectric Composites of Polyvinylidene Fluoride,Tb-Dy-Fe Alloy,and Lead Zireonate Titanate

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of technology(Materials science) 2007年第4期22卷 596-599页

作者：赵广辉熊传溪 State Key Laboratory of Advanced technology for Materials Synthesis and Processing school of computer science and {3. Wuhan University of TechnologyWuhan 430070China school of Materials science and Engineering Wuhan University of TechnologyWuhan 430070China

The novel sandwich composites were prepared by sandwiching a polyvinylidene fluoride/Tb- Dy-Fe alloy composite （PVDF/Terfenol-D） between polyvinylidene fluoride/lead zirconate titanate composites （PVDF/PZT）. The maximum magnetoelectric effect voltage coefficient, （dE/dn）3.max, of the sandwich composites is higher than that of three-phase composites at their own optimal loading level of Terfenol-D. This is attributed to less interface relaxations of strain and better polarization of the sandwich composites. When the volume fraction of Terfenol-D is higher than 0.10, no coupling interaction for three-phase composites could be observed, but （dE/dn）3.max of sandwiched composites still reached 20 mV/（***）. At high magnetic field intensity, the magnetoelectric effect voltage coefficient, （dE/dn）3., of sandwich composites is higher than that of three-phase composites; at low magnetic field intensity, （dE/dn）3. of sandwich composites is lower than that of three-phase composites. At their resonance frequency, the （dE/dn）3.max of the sandwich composites and the three phase composites are 150 mV/（***） and 42 mV/（cmoOe）, respectively. This significant increase of （dE/ dn）3.max at resonance frequency confirms the improvement of maximum magnetoelectric effect coefficient via sandwich-structured composites.

关键词： magnetoelectric piezoelectric sandwiched composites