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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,{2.,Beijing 100190,china 2.chool of Computer Science and technology,Nanjing Normal University,Nanjing 2.0046,china 3Provincial Key Laboratory for Computer Information Processing technology,Soochow University,Suzhou 2.5000,china institute of computing {2. 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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An analysis of TinyML@ICCAD for implementing AI on low-power microprocessor

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Science china(Information sciences) 2024年第4期67卷 343-344页

作者： guoqing LI Jingwei zhang Meng zhang Tuo LI Tinghuan CHEN Jun YANG Shandong Yunhai Guochuang Cloud computing Equipment Industry Innovation Co. Ltd. School of Integrated Circuits Southeast University Shandong Inspur Artificial Intelligence Research institute Co. Ltd. School of Science and Engineering The Chinese University of Hong Kong

Tiny machine learning(ML) is an important application area of artificial intelligence(AI), which focuses on deploying AI on small hardware platforms with constrained resources [1, 2.. The high-level TinyML contests at high-level conferences promote the development of TinyML areas, such as DAC-SDC [3] and TinyML@ICCAD [4].

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Simulation of aerodynamic performance affected by vortex generators on blunt trailing-edge airfoils

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Science china(Technological sciences) 2010年第1期53卷 1-7页

作者： YANG Ke1,2.zhang Lei1,3 & XU JianZhong1,2.1 institute of Engineering Thermophysics,{2.,Beijing 100190,china 2.Key Laboratory of Wind Energy Utilization,{2.,Beijing 100190,china 3 Graduate School of {2.,Beijing 100190,china institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China Key Laboratory of Wind Energy Utilization Chinese Academy of Sciences Beijing China Graduate School of chinese academy of sciences Beijing China

An investigation was carried out by numerical simulation on a wind turbine airfoil and a blunt trailing-edge airfoil with and without vortex generators (VGs), and the performance of the airfoils was analyzed. By the simulation of airfoil DU 91-W2.2.0 it was verified that the numerical method and model were credible. Based on this airfoil, a new one with a blunt trailing edge of 6% chord was blended by symmetrically adding thickness, and its characteristics curves were obtained through computing at key angles of attack. Additionally, the pressure distribution on blended airfoil was analyzed by comparing to the airfoil without blend. The interaction of streamwise vortices induced by VGs with trailing vortex or separation vortex was considered, followed by the uncovery of how VGs can suppress the boundary layer separation.

关键词： vortex generators airfoil blunt trailing-edge

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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 {2., Harbin institute of {2., Harbin 150001, china 2.esearch Center of Information Security, institute of computing {2., 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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Identification and virulence test of a new pathogen that causes verticillium striping on rapeseed in northwestern china

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Oil Crop Science 2024年第1期9卷 8-19页

作者： We Si Ruisheng Wang Mingde Wu Long Yang guoqing Li Jing zhang State Key Laboratory of Agricultural Microbiology and Key Laboratory of Plant Pathology of Hubei Province Huazhong Agricultural UniversityWuhan 430070China Qinghai academy of Agriculture and Forestry sciences Qinghai UniversityXiningQinghai Province810016China

Five stems of rapeseed with abundant black microsclerotia were collected from Huangyuan County of Qinghai Province,china,and fungal isolates were obtained from the *** were identified based on morphology,molecular features and specific PCR *** results showed that the 10 fungal isolates belonged to Verticillium longisporum lineage A1/*** of the 10 isolates(HW7-1)was tested for virulence on three species of rapeseed,including *** Zhongshuang 9,*** Qingyou 9 and *** Tayou 2.by conidia inoculation of HW7-1 on roots of young *** seedlings were inoculated with *** conidia or water *** seedlings of these treatments were transplanted in culture mix and incubated in a growth chamber(2.℃).Results suggested that the control seedlings of three cultivars appeared quite healthy,while the seedlings inoculated with HW7-1 turned yellowing leaves,seedling stunting or even death after 2. days *** was re-isolated from he yellow leaves,thus fulfilling Koch's ***,compared to the control treatments,inoculation with HW7-1 caused flowering delay and seed yield reduction on Tayou 2.with production of microsclerotia on the *** our knowledge,this is the first report of *** lineage A1/D3 on rapeseed in northwestern china.

关键词： Verticillium longisporum lineage A1/D3 Virulence Rapeseed china

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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 {2., Beijing 10012., china 2.ational Center of Intelligent computing, institute of computing {2., 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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P2. 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 guoqing 2.,SONG HaiBin 5 ,CAO JiGuang 6 & YANG Jing 7 1 School of Computer Science and technology,Nanjing Normal University,Nanjing 2.0046,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 4112.1,china 4 Graduate University of chinese academy of sciences,Beijing 100190,china 5 Nanjing R&D Center,Huawei Technologies,Nanjing 2.0012.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 {2. 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 (P2.) 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 P2. content providers and ***,how to efficiently use network resources to reduce the traffic burden on the ISPs is crucial for the sustainable development of P2. *** paper surveys the state-of-art P2. traffic optimization technologies from three perspectives:P2. 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： P2. traffic localization P2. traffic optimization P2. cache locality-awareness network coding content-centric network

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Near infrared lights emission of ^(40)Ar^(16+) impacting on metal surfaces

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Science china(Physics,Mechanics & Astronomy) 2009年第7期52卷 1021-1026页

作者： zhang XiaoAn1,2. XIAO guoqing2. YANG ZhiHu2. WANG Li1 & ZHAN WenLong2.1 Department of Physics, Xianyang Normal University, Xianyang 712.00, {2. 2.institute of Modern Physics, chinese academy of sciences, Lanzhou 730000, {2. Department of Physics Xianyang Normal University Xianyang China institute of Modern Physics Chinese Academy of Sciences Lanzhou China

The highly charged ion 40Ar16+ with the velocity (kinetic energy EK=150 keV, velocity V=8.5×105 m/s) smaller than Bohr velocity (VBohr=2.9×106 m/s) was found to hove impacts on the surfaces of metals Ni, Mo, Au and Al, and the Ar atomic infrared light lines and X-rays spectra were simultaneously measured. The experimental results show that the highly charged ion that captures electrons is neutralized, and the multiply-excited hollow atom forms. The hollow atom cascade decay radiates lights from infrared to X-ray spectrum. The intensity of infrared lights shows that the metallic work functions play an important role in the neutralization process of highly charged ions during their interaction with metallic surfaces, which verifies the classical over-the-barrier model.

关键词： infrared light lines X-ray neutralization highly charged ions

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The characteristic spectral lines of target atoms in the impact of^(40)Ar^(q+)ions on metal surfaces

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Science china(Physics,Mechanics & Astronomy) 2004年第6期47卷 729-736页

作者： zhang Xiao’an1,2.ZHAO Yongtao1,2.LI Fuli1,YANG Zhihu2.XIAO guoqing2.& ZHAN Wenlong2.1.Department of Applied Physics,Xi’an Jiaotong University,Xi’an 710049,{2. 2.institute of Modern Physics,chinese academy of sciences,Lanzhou 730000,{2. Department of Applied Physics Xi'an Jiaotong University Xi'an 710049 China institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China

We report the measured results of the 2.0 nm—1000 nm characteristic spectral lines of target atoms when highly charged ions40Ar q+(6≤q≤14) with the same kinetic energy and40Ar6+ with different kinetic energies are incident upon Al, Ti, Ni, Ta and Au surfaces, respectively. The results for12.Xe6+,12.Xe10+ and12.Xe15+ with the same kinetic energy (150 keV) incident upon a Ta surface are also reported. These results show that when the projectile and target are properly selected (40Ar12. impinges on Al,12.Xe6+ impinges on Ta), the spectral intensity of characteristic spectral lines of the target atom is effectively enhanced, and is not strongly dependent on the kinetic energy of the incident ions.

关键词： highly charged ion, hollow atom, characteristic spectrum, spectral intensity.

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The properties of halo structure for ^(17)B

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Science china(Physics,Mechanics & Astronomy) 2008年第7期51卷 781-787页

作者： HU ZhengGuo1, WANG Meng1, XU HuShan1, SUN ZhiYu1, WANG JianSong1, XIAO guoqing1, ZHAN WenLong1, XIAO ZhiGang1, MAO RuiShi1,2. LI Chen1, zhang XueYing1,2. zhang HongBin1, ZHAO TieCheng1, XU ZhiGuo1, WANG Yue1,2. CHEN RuoFu1,2. HUANG TianHeng1,2. FU Fen1,2. GAO Qi1,2. HAN JianLong1,2. zhang XueHeng1,2. ZHENG Chuan1,2. YU YuHong1,2.& GUO ZhongYan1 1 institute of Modern Physics, chinese academy of sciences, Lanzhou 730000, china 2.Graduate University of the chinese academy of sciences, Beijing 100049, china institute of Modern Physics Chinese Academy of Sciences Lanzhou China Graduate University of the chinese academy of sciences Beijing China

The total reaction cross section (172.±93 mb) of 17B at the energy of 43.7 A MeV on C target has been measured by using the transmission method at the Radioactive Ion Beam Line in Lanzhou (RIBLL). Assuming 17B consists of a core 15B plus two halo neutrons,the total cross section of 17B on C target was calculated with the zero-range Glauber model,where double Gaussian density distributions and Gaussian plus HO density distributions were used. It can fit the experimental data very well. The characteristic of halo structure for 17B was found with a large diffusion of the neutrons density distribution.

关键词： total cross section density distribution Glauber model the characteristic of halo structure

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