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Communication network designing:Transmission capacity,cost and scalability

Science china(Information sciences) 2012年第11期55卷 2454-2465页

作者： zhang guoqiang1,2,3.& zhang guoqing1 1institute of computing technology,Chinese academy of {3.,beijing 100190,china 2School of Computer Science and technology,Nanjing Normal University,Nanjing 210046,china 3.rovincial Key Laboratory for Computer Information Processing technology,Soochow University,Suzhou 215000,china institute of computing technology Chinese Academy of Sciences Beijing China School of Computer Science and technology Nanjing Normal University Nanjing China Provincial Key Laboratory for Computer Information Processing technology Soochow University Suzhou China

Despite the growing number of works centering around the traffic dynamics on complex networks,these researches still have some common shortcomings,e.g.,too simple traffic flow model and lack of considerations for the designing cost and scalability *** paper builds on a more realistic traffic flow model,and offers a holistic view on the network designing *** addition to the extensively studied transmission capacity,this paper takes designing cost and scalability as two other designing objectives,and presents a quantitative study of how different designing choices independently and collectively influence these objectives by the introduction of a cartesian coordinate *** is shown that different kinds of network topologies display different shapes of achievable solution spaces and exhibit different abilities to achieve cost-effective and scalable *** particular,we find the philosophy underlying empirical network designing and engineering today fails to meet the cost-effective and scalable designing requirements,and propose a cost-effective and scalable designing scheme for BA-like networks,i.e.,the efficient routing combined with effective betweenness based link bandwidth *** addition,when designing a thoroughly new network from the beginning,we find that ER network is a good candidate to achieve cost-effective and scalable designing in most settings.

关键词： cost-effective communication network designing network transmission efficiency network topology traffic dynamics next generation network scalable network designing

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A Bitcoin Address Multi-Classification Mechanism Based on Bipartite Graph-Based Maximization Consensus

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Computer Modeling in Engineering & sciences 2024年第4期139卷 783-800页

作者： Lejun zhang Junjie zhang Kentaroh Toyoda Yuan Liu Jing Qiu Zhihong Tian Ran Guo College of Information Engineering Yangzhou UniversityYangzhou225127China Cyberspace institute Advanced technology Guangzhou UniversityGuangzhou510006China Research and Development Center for E-Learning Ministry of EducationBeijing100039China institute of High Performance computing(IHPC) Agency for ScienceTechnology and Research(A∗STAR)Singapore138632Singapore School of Physics and Materials Science Guangzhou UniversityGuangzhou510006China

Bitcoin is widely used as the most classic electronic currency for various electronic services such as exchanges,gambling,marketplaces,and also scams such as high-yield investment *** the services operated by a Bitcoin address can help determine the risk level of that address and build an alert model *** engineering can also be used to flesh out labeled addresses and to analyze the current state of Bitcoin in a small *** this paper,we address the problem of identifying multiple classes of Bitcoin services,and for the poor classification of individual addresses that do not have significant features,we propose a Bitcoin address identification scheme based on joint multi-model prediction using the mapping relationship between addresses and *** innovation of the method is to(1)Extract as many valuable features as possible when an address is given to facilitate the multi-class service identification task.(2)Unlike the general supervised model approach,this paper proposes a joint prediction scheme for multiple learners based on address-entity mapping ***,after obtaining the overall features,the address classification and entity clustering tasks are performed separately,and the results are subjected to graph-basedmaximization *** final result ismade to baseline the individual address classification results while satisfying the constraint of having similarly behaving entities as far as *** testing and evaluating over 26,000 Bitcoin addresses,our feature extraction method captures more useful *** addition,the combined multi-learner model obtained results that exceeded the baseline classifier reaching an accuracy of 77.4%.

关键词： Bitcoin multi-service classification graph maximization consensus data security

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Unstructured Road Extraction in UAV Images based on Lightweight Model

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 372-384页

作者： Di zhang Qichao An Xiaoxue Feng Ronghua Liu Jun Han Feng Pan School of Automation Beijing Institute of TechnologyBeijing 100081China Tianjin institute of Maritime Navigation Instruments Tianjin 300130China The 716th Research institute of china Shipbuilding Group Co. LtdJiangsu 222061China

There is no unified planning standard for unstructured roads,and the morphological structures of these roads are complex and *** is important to maintain a balance between accuracy and speed for unstructured road extraction *** road extraction algorithms based on deep learning have problems such as high model complexity,high computational cost,and the inability to adapt to current edge computing ***,it is best to use lightweight network *** the need for lightweight models and the characteristics of unstructured roads with different pattern shapes,such as blocks and strips,a TMB(Triple Multi-Block)feature extraction module is proposed,and the overall structure of the TMBNet network is *** TMB module was compared with SS-nbt,Non-bottleneck-1D,and other modules via *** feasibility and effectiveness of the TMB module design were proven through experiments and *** comparison experiment,using multiple convolution kernel categories,proved that the TMB module can improve the segmentation accuracy of the *** comparison with different semantic segmentation networks demonstrates that the TMBNet network has advantages in terms of unstructured road extraction.

关键词： Unstructured road Lightweight model Triple Multi-Block(TMB) Semantic segmentation net

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Identifying heavy hitters in high-speed network monitoring

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Science china(Information sciences) 2010年第3期53卷 659-676页

作者： zhang Yu1, FANG BinXing1,2 & zhang YongZheng2 1Research Center of Computer Network and Information Security technology, Harbin {3. of technology, Harbin 150001, china 2Research Center of Information Security, {3. of computing technology, Chinese academy of sciences, beijing 100190, china Research Center of Computer Network and Information Security technology Harbin Institute of Technology Harbin China Research Center of Information Security Institute of Computing Technology Chinese Academy of Sciences Beijing China

Identifying heavy hitters in a network traffic stream is important for a variety of network applications ranging from traffic engineering to anomaly detection such as detection of denial-of-service attacks. Existing methods generally examine newly arriving items in the stream, perform a small number of operations using a small amount of memory, and still provide guarantees on the identifying accuracy. In high-speed network monitoring, the update speed per item is extremely critical. However, so far as we know, there are no identifying algorithms which can provide constant update time (O(1)) in a weighted data stream. In this paper, we present an algorithm named Weighted Lossy Counting (WLC) which is able to identify heavy hitters in a high-speed weighted data stream with constant update time. WLC employs a novel efficient partially ordered data structure which is able to provide a fast per-item update speed while keeping the memory cost relatively low. We compare WLC with state-of-the-art algorithms for finding heavy hitters in real traffic traces. The experimental results show that WLC performs well in accuracy (recall, precision and average relative error) as other algorithms; moreover it has a much higher update speed at the cost of relatively larger memory space used. A theoretical worst-case memory bound of WLC is also derived in this paper; however, experiments with long real traffic traces show that WLC requires much less space than the theoretical bound in practice.

关键词： network traffic monitoring heavy hitter weighted data streams

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P2P traffic optimization

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Science china(Information sciences) 2012年第7期55卷 1475-1492页

作者： zhang guoqiang 1,2 ,TANG MingDong 3.,CHENG SuQi 2,4 ,zhang {3. 2 ,SONG HaiBin 5 ,CAO JiGuang 6 & YANG Jing 7 1 School of Computer Science and technology,Nanjing Normal University,Nanjing 210046,china 2 institute of computing technology,Chinese academy of sciences,beijing 100190,china 3.School of Computer Science and Engineering,Hunan University of Science and technology,Xiangtan 411201,china 4 Graduate University of Chinese academy of sciences,beijing 100190,china 5 Nanjing R&D Center,Huawei Technologies,Nanjing 210012,china 6 china academy of Telecommunication Research of MIIT,beijing 100191,china 7 china Mobile Research institute,beijing 100053.china School of Computer Science and technology Nanjing Normal University Nanjing China institute of computing technology Chinese Academy of Sciences Beijing China School of Computer Science and Engineering Hunan University of Science and Technology Xiangtan China Graduate University of Chinese academy of sciences Beijing China Nanjing R&D Center Huawei Technologies Nanjing China china academy of Telecommunication Research of MIIT Beijing China china Mobile Research institute Beijing China

Peer-to-peer (P2P) based content distribution systems have emerged as the main form for content distribution on the Internet,which can greatly reduce the distribution cost of content providers and improve the overall system ***,the mismatch between the overlay and underlay networks causes large volume of redundant traffic,which intensifies the tension between P2P content providers and ***,how to efficiently use network resources to reduce the traffic burden on the ISPs is crucial for the sustainable development of P2P *** paper surveys the state-of-art P2P traffic optimization technologies from three perspectives:P2P cache,locality-awareness and data *** details,comparison between these technologies and their applicabilities are presented,followed by a discussion of the issues that remain to be addressed and the direction of future content distribution research.

关键词： P2P traffic localization P2P traffic optimization P2P cache locality-awareness network coding content-centric network

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Analysis of moment invariants under general linear transformation

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Science china(Information sciences) 2010年第7期53卷 1305-1311页

作者： DIAO LuHong1, LI Hua2, zhang Sen1 & LIU Lei1 1College of Applied sciences, beijing University of {3., beijing 100124, china 2National Center of Intelligent computing, institute of computing {3., Chinese academy of Science, beijing 100080, china College of Applied sciences Beijing University of Technology Beijing China National Center of Intelligent computing Institute of Computing Technology Chinese Academy of Science Beijing China

This paper presents the necessary and sufficient condition of moment invariants under general linear transformation. Based on this condition, arbitrary order and dimensional moment invariant sets can be constructed. D... 详细信息

关键词： moment invariants independence linear transformation

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Multiparty simultaneous quantum identity authentication with secret sharing

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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,{3. University of technology,{3. 100022,china 2 State Key Laboratory of Information Security (Graduate University of the Chinese academy of sciences),{3. 100049,china 3.School of Science,{3. University of Posts and Telecommunications,{3. 100876,china 4 institute of Electronic technology,Information Engineering University,Zhengzhou 450004,china 5 Trusted computing Laboratory,{3. University of technology,{3. 100022,china College of Computer Science and technology Beijing University of Technology Beijing China State Key Laboratory of Information Security (Graduate University of the Chinese academy of sciences) Beijing China School of Science Beijing University of Posts and Telecommunications Beijing China institute of Electronic technology Information Engineering University Zhengzhou China Trusted computing Laboratory Beijing University of Technology Beijing 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

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Subchronic toxicological effects of aquatic nitrobenzene on Medaka and Chinese rare minnow

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Science china Chemistry 2007年第5期50卷 707-717页

作者： ZHOU QunFang1, FU JianJie1,2, MENG HaiZhen1,2, ZHU XueYan1,2, JIANG GuiBin1, zhang JianBin1, LIU JieMin2 & SHI guoqing2 1 State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental sciences, Chinese {3. of sciences, beijing 100085, china 2 Department of Chemistry, School of Applied Science, University of Science and technology beijing, beijing 100083. china State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing China Department of Chemistry School of Applied Science University of Science and Technology Beijing Beijing China

Based on the simulative exposure experiments of nitrobenzene to two small experimental fishes, Medaka (Oryzias latipes) and Chinese Rare Minnow (Gobiocypris rarus), it was found that nitrobenzene could decrease in a linear way in the static aquatic system. Both fishes could accumulate dose-related levels of nitrobenzene quickly and eliminate the compound rapidly when they were transferred to clean water. The Chinese rare minnow showed more sensitivity to the acute toxicity exposure of nitrobenzene than Medaka. Typical molecular biomarkers in oxidative defense system including superoxide dismu- tase (SOD), catalase (CAT) showed the chemical induced alterations. The changes of acetylcholi- nesterase (AChE) activities indicated that nitrobenzene might affect the normal neural function. Nitro- benzene exposure could also lead to obvious damaging effects on the target organs, such as gill and liver by hitopathological studies.

关键词： nitrobenzene, Medaka, Chinese rare minnow, bioaccumulation, elimination, molecular biomarkers, histopathological effects

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当量比对铝粉/空气旋转爆轰发动机流场影响的数值模拟

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航空动力学报 2024年第5期39卷 80-94页

作者：李世全杨帆王宇辉王健平张国庆北京化工大学机电工程学院北京100029 北京大学工学院北京100871 北京理工大学宇航学院北京100081

以铝粉为燃料,空气为氧化剂,通过一步反应机理,对不同当量比下气固两相旋转爆轰发动机的流场进行二维数值模拟研究。结果表明:由于颗粒注入速度和空气注入速度存在差异,导致反应物区中的颗粒三角区和空气三角区不完全重叠,使得当量比从... 详细信息

以铝粉为燃料,空气为氧化剂,通过一步反应机理,对不同当量比下气固两相旋转爆轰发动机的流场进行二维数值模拟研究。结果表明:由于颗粒注入速度和空气注入速度存在差异,导致反应物区中的颗粒三角区和空气三角区不完全重叠,使得当量比从0.6增加到1.4时,爆轰波前的平均局部当量比从0.929增加到2.093.爆轰波速度从2 070 m/s降低到1 690 m/s,爆轰波压力从5.67 MPa降低到4.87 MPa。燃烧室内基本的流场与气相旋转爆轰发动机相似,但气固两相之间的相互作用使得颗粒呈现出特有的分布特性,包括2个颗粒群和4条颗粒带以及它们之间的间隙。

关键词：旋转爆轰发动机气固两相流当量比铝粉爆燃

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The Symmetric Banzhaf Value for Fuzzy Games with a Coalition Structure

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International Journal of Automation and computing 2012年第6期9卷 600-608页

作者： Fan-Yong Meng 1 Qiang zhang 2 1 School of Management,Qingdao Technological University,Qingdao 266520,china 2 School of Management and Economics,beijing {3. of technology,beijing 100081,china School of Management Qingdao Technological University Qingdao China School of Management and Economics Beijing Institute of Technology Beijing China

In this paper,a generalized form of the symmetric Banzhaf value for cooperative fuzzy games with a coalition structure is *** axiomatic systems of the symmetric Banzhaf value are given by extending crisp ***,we study the symmetric Banzhaf values for two special kinds of fuzzy games,which are called fuzzy games with multilinear extension form and a coalition structure,and fuzzy games with Choquet integral form and a coalition structure,respectively.

关键词： Cooperative fuzzy game coalition structure symmetric Banzhaf value multilinear extension Choquet integral.

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