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Improvements on radiation-hardened performance of static induction transistor

Science china(information Sciences) 2010年第5期53卷 1089-1096页

作者： WANG YongShun 1 , LUO XianLiang 1 , LI HaiRong 2., WANG ZiTing 1 , WU Rong 1 , ZHANG CaiZhen 2.& LI SiYuan 2.1 school of electronic and {2. Engineering, Lanzhou Jiaotong University, Lanzhou 730070, china 2.Institute of Microelectronics, school of Physical Science and Technology, Lanzhou University, Lanzhou 730000, china 1. school of electronic and {2. Engineering Lanzhou Jiaotong University Lanzhou 730070 China2. Institute of Microelectronics School of Physical Science and Technology Lanzhou University Lanzhou 730000 China

The radiation-hardened performances of static induction transistor (SIT) have been studied in depth in this paper. The effects of radiation of electron beam on the I-V characteristics, carrier distribution and potential distribution in the channel of SIT have been represented. A large number of electron-hole pairs are generated in the depletion region of reversely biased gate-channel PN junction. The radiation-generated electrons drift towards the drain region at high positive potential, while generated holes flow into gate region biased to the lowest potential. With the accumulation of holes in gate region, the gate potential is boosted, resulting in a decrease in the height of potential barrier in channel, and an increase in drain current. I-V characteristics of SIT in the presence of radiation have been theoretically derived, and compared with experimental results. With the increase in thickness of epitaxial layer, the radiation-hardened capability of SIT is continuously improved until the optimum thickness of 2. μm is reached. The optimum matching relationship among geometric, material and technological parameters has been represented to acquire excellent radiation-hardened performances of SIT.

关键词： static induction transistor radiation-resistant potential barrier electron beam radiationgenerated carriers

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Stabilization for discrete-time fuzzy systems with Takagi-Sugeno's models:reduce the complexity

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Science china(information Sciences) 2010年第12期53卷 2506-2513页

作者： WANG LiKui 1 & LIU XiaoDong 2.1 school of Mathematics and information Science,Nanchang Hangkong University,Nanchang 330063,{2. 2.Research Center of information and Control,Dalian University of Technology,Dalian 11602.,{2. 1. school of Mathematics and information Science Nanchang Hangkong University Nanchang 330063 China2. Research Center of Information and Control Dalian University of Technology Dalian 116024 China

The problem of sate feedback control for discrete-time fuzzy systems with Takagi-Sugeno's models is investigated to reduce the computational burden.A stabilization condition is obtained by applying a new Lyapunov *** is shown that our new theorem is equivalent to an existing result in guaranteeing the stability of the fuzzy system but consumes less computational time than the *** effectiveness and the superiority of the proposed design approach are demonstrated by an example borrowed from the literature.

关键词： Takagi-Sugeno’s fuzzy model non-quadratic Lyapunov function linear matrix inequality

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Methods of 3D map storage based on geo-referenced image database

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中国有色金属学会会刊：英文版 2011年第S3期21卷 654-658页

作者： YUAN Zhan-liang1, 2. LI Xun1, WANG Jin-ling1, YUAN Qi-qi1, XU Dan2. DIAO Jing-jing2.1. school of Surveying and Spatial information Systems, University of New South Wales, NSW 2.32. Australia 2. school of Surveying and Mapping, Henan Polytechnic University, Jiaozuo 454000, china [a] school of Surveying and Spatial information Systems University of New South Wales NSW 2032 Australia [b] school of Surveying and Mapping Henan Polytechnic University Jiaozuo 454000 China

In order to store and manage a large amount of ground and indoor image data with high resolution, an integrated data management system needs to be developed. Possible strategies for this purpose were discussed together with initial test on the newly defined 3D maps. The features of such 3D maps, data organization, key techniques used for the map storage, such as image compression based on wavelet transformation, quadtree index, update and retrieval, were analyzed, with the goals of bringing some profits to the storage and management of the digital data in the visual construction of digital mine, digital city and digital community.

关键词： 3D map geo-referenced image image database storage technology

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Notifiable infectious disease surveillance with data collected by search engine

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Journal of Zhejiang University-Science C(Computers and electronics) 2010年第4期11卷 241-248页

作者： Xi-chuan ZHOU1,Hai-bin SHEN2.(1Department of information Science and electronic Engineering,Zhejiang University,Hangzhou 31002.,{2.) (2.3} of Electrical Engineering,Zhejiang University,Hangzhou 31002.,{2.) Department of information Science and electronic Engineering Zhejiang University Hangzhou China school of Electrical Engineering Zhejiang University Hangzhou China

Notifiable infectious diseases are a major public health concern in china,causing about five million illnesses and twelve thousand deaths every *** detection of disease activity,when followed by a rapid response,can reduce both social and medical impact of the *** aim to improve early detection by monitoring health-seeking behavior and disease-related news over the ***,we counted unique search queries submitted to the Baidu search engine in 2.08 that contained disease-related search *** we counted the news articles aggregated by Baidu's robot programs that contained disease-related *** found that the search frequency data and the news count data both have distinct temporal association with disease *** adopted a linear model and used searches and news with 1–2.0-day lead time as explanatory variables to predict the number of infections and deaths attributable to four notifiable infectious diseases,i.e.,scarlet fever,dysentery,AIDS,and *** the search frequency data and news count data,our approach can quantitatively estimate up-to-date epidemic trends 10–40 days ahead of the release of Chinese Centers for Disease Control and Prevention(Chinese CDC)*** approach may provide an additional tool for notifiable infectious disease surveillance.

关键词： Notifiable infectious diseases Disease surveillance Search engine

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A formal model of fair exchange protocols

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Science in china(Series F) 2005年第4期48卷 499-512页

作者： QING Sihan1,2.3 & LI Gaicheng1,2.3 1. Engineering Research Center for information Security Technology, Institute of Software, Chinese Aca- demy of Sciences, Beijing 100080, china 2. Beijing Zhongke Ansheng Corporation of information Technology, Beijing 100080, china 3. Graduate school of the Chinese Academy of Sciences, Beijing 100039, china 1. Engineering Research Center for information Security Technology Institute of Software Chinese Academy of Sciences 100080 Beijing China 2. Beijing Zhongke Ansheng Corporation of information Technology 100080 Beijing China 3. Graduate school of the Chinese Academy of Sciences 100039 Beijing China

Based on the study of existing fair exchange protocols, this paper sets up an accurate formal model by stepwise refinement. In the process of refinement an unreliable channel is employed to simulate an attack behavior. The model provides a novel formal definition of exchanged items, and presents the formal goals for fairness, accountability, etc., reflecting the inherent requirements for fair exchange protocols across-the-board. In order to check, prove, and design fair exchange protocols effectively and efficiently, the model puts forward a novel property of abuse-freeness which applies to all fair exchange protocols, gives a formal definition for trust strand of the third party, and presents general criteria of designing a secure and effective fair exchange protocol. Taking a typical fair exchange protocol as an example, this paper presents the analysis steps of fair exchange protocols appealing to our model. An unknown attack is uncovered. The analysis reveals the process of a complete attack, discovering deeper reasons for causing an attack. Finally, we modify the flawed protocol and the revised protocol ensures the desirable properties.

关键词： events local causal relation local temporal relation global relation exchanged item security goals.

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Electrical property of 8-mol% yttria-stabilized zirconia electrolyte by spark-plasma sintering

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Science china(Technological Sciences) 2004年第5期47卷 569-576页

作者： JIAN Jiawen1,2. CHANG Aimin3, YANG Bangchao2.& ZHANG Yikang4 1. The school of information Science Engineering, Ningbo University, Ningbo 3152.1, {2. 2. The school of Microelectronics and Solid-state electronics, University of electronic Science and Tech-nology of {2., Chengdu 610054, {2. 3. The Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 83002., {2. 4. Hongtak (Chengdu) electronic Co., Ltd, Chengdu 610041, {2. Correspondence should be addressed to Jian Jiawen 1. The school of information Science Engineering Ningbo University 315211 Ningbo China 2. The school of Microelectronics and Solid-state electronics University of Electronic Science and Technology of China 610054 Chengdu China 3. The Xinjiang Technical Institute of Physics and Chemistry Chinese Academy of Sciences 830022 Urumqi China 4. Hongtak (Chengdu) electronic Co. Ltd 610041 Chengdu China

Spark-plasma sintering (SPS) process was used to sinter ZrO2.(8Y) powders, and a relative density of 99% has been reached at a low temperature (1350°C) and short dwelling time (10 min) compared to the conventional sintered identical samples (1450°C 4 h)(CS). By the X-ray diffraction (XRD) patterns, the microstructure of the SPS pellet and CS pellet are both indexed by the cubic unit cell (Fm3m). The finer crystallite size (D111) of the SPS pellet is 154 nm and D111 of the CS pellet is more than 1 μm. The AC impedance spectroscopy shows that the ionic conductivity of SPS pellet is different from that of CS pellet. The activation energy for the SPS ceramics, estimated from the slope in the range of 400–800°C, was 91 kJ mol?1, which is in good agreement with CS pellet (96 kJ mol?1), indicating that the conduction mechanism in SPS ceramics is similar to that in CS ceramics.

关键词： yttria-stabilized zirconia electrolyte, spark-plasma sintering, AC impedance.

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Cross-Layer Design of Energy-Saving AODV Routing Protocol

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Transactions of Tianjin University 2009年第5期15卷 343-349页

作者：李冰金志刚舒炎泰 school of Computer Science and Technology Tianjin University school of electronics and {2. Engineering Tianjin University

Since most ad hoc mobile devices today operate on batteries,the power consumption becomes an important *** paper proposes a cross-layer design of energy-aware ad hoc on-demand distance vector(CEAODV) routing protocol which adopts cross-layer mechanism and energy-aware metric to improve AODV routing protocol to reduce the energy consumption and then prolong the life of the whole *** CEAODV,the link layer and the routing layer work together to choose the optimized transmission power for nodes and the route for *** link layer provides the energy consumption information for the routing layer and the routing layer chooses route accordingly and conversely controls the link layer to adjust the transmission *** simulation result shows that CEAODV can outperform AODV to save more *** can reduce the consumed energy by about 8%over traditional energy-aware *** the performance is better when the traffic load is higher in the network.

关键词： ad hoc network energy conservation cross-layer routing

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Fabrication and Characterization of Nano Silver Powder Prepared by Spray Pyrolysis

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Journal of Wuhan University of Technology(Materials Science) 2009年第6期24卷 871-874页

作者：章桥新 school of Mechanical and electronic Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis & Processing Wuhan University of Technology

Silver powder was fabricated by spray pyrolysis, using 2.-2.% AgNO3 solution, 336-500 mL/h flux of AgNO3 solution, 0.2.-0.32.MPa flux of carrier gas and in the 62.-82. ℃ temperature range. The effects of furnace set temperature, concentration of AgNO3 aqueous solution, flux of AgNO3 aqueous solution as well as carrier gas on the morphology and particle size distribution of silver powder, were investigated. The experimental results showed that with the high concentration of AgNO3 aqueous solution, the average grain size of silver decreased with the increasing of furnace set temperature. But the gain size distribution was not homogenous, the discontinuous grain growth occurred. With the low concentration of AgNO3 aqueous solution, the higher furnace set temperature made the nano sliver grains sintered together to grow. Nano silver powder about 100 nm was fabricated by spray pyrolysis, using 2.t% AgNO3 solutions, 336 mL/h flux of AgNO3 aqueous solution, 0.32.MPa flux of carrier gas at 72. ℃ furnace set temperature.

关键词： nano silver powder fabrication characterization spray pyrolysis

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An application of the Riemann-Roch theorem

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Science china Mathematics 2008年第4期51卷 765-772页

作者： WANG ShiKun~1 ZHANG HuiPing~(2.) 1 KLMM and IAM AMSS Chinese Academy of Sciences Beijing 100080 china 2.school of {2. Renmin University of china Beijing 100872.china 1. KLMM and IAM AMSS Chinese Academy of Sciences Beijing 100080 China 2. school of information Renmin University of China Beijing 100872 China

Applying the Riemann-Roch theorem,we calculate the dimension of a kind of mero- morphicλ-differentials’ space on compact Riemann *** we also construct a basis of theλ-differentials’ *** the main result,the Cauchy ... 详细信息

关键词： Riemann-Roch theorem λ-differential annulus domain Cauchy integral formula 14C40

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Perfect reconstruction image modulation based on BEMD and quaternionic analytic signals

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Science china(information Sciences) 2011年第12期54卷 2622-2634页

作者： QIAO LiHong 1 , NIU KaiFu 2., WANG Ning 2.& PENG LiZhong 2.1 College of information Science and Engineering, Henan University of Technology, Zhengzhou 450001, china {2. of Mathematical Sciences, Peking University, Beijing 100871, china 1. College of information Science and Engineering Henan University of Technology Zhengzhou 450001 China2. School of Mathematical Sciences Peking University Beijing 100871 China

Image modulation represents image by meaningful characters such as image instantaneous amplitude and instantaneous frequency. A perfect reconstruction image modulation method is proposed. In detail, the bidimensional empirical mode decomposition (BEMD) is first improved to adaptively decompose image into monocomponents. Then by the quaternionic analytic method, suitable analytic signals is acquired. A new polar form is further proposed to modulate images, then seven characters are derived including instantaneous amplitude and instantaneous frequencies. We demonstrate the techniques on both synthetic and natural images, depict the needle program of the estimated frequencies and obtain the reconstructions that are the same with the original images. The applications in image segmentation and separation establish the validity of characterizing images of this type as sums of locally narrow band modulated components.

关键词： perfect reconstruction image modulation AM-FM representation BEMD quaternionic analytic signals

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