检索结果-南通市图书馆

Evolutionary ciphers against differential power analysis and differential fault analysis

Science China(Information sciences) 2012年第11期55卷 2555-2569页

作者： TANG Ming1,2,QIU ZhenLong2,YANG Min3.CHENG PingPan2,GAO Si2,LIU ShuBo1,2 & MENG QinShu2 1State key Lab.of AIS & TC,Ministry of Education,wuhan University,wuhan 43.072,China 2School of Computers,wuhan University,wuhan 43.072,China 3.nternational School of Software,wuhan University,wuhan 43.072,China State key Lab. of AIS & TC Ministry of Education Wuhan University Wuhan China School of Computers Wuhan University Wuhan China International School of Software Wuhan University Wuhan China

Side channel analysis(SCA) focuses on attacking cryptographic algorithm implementations by collecting leaked information and analyzing the correlation between the leaked and key information in the cryptographic ***,SCA is the main threat to cryptographic implementations,with DPA(differential power analysis) and DFA(differential fault analysis) being two of the most threatening types of ***,the existing countermeasures against DPA and DFA have shortcomings and can hardly protect cipher designs *** on a comprehensive analysis of DPA and DFA,this paper proposes a new idea of using an evolutionary cipher(EVOC) against DPAs based on the model proposed by Kocher,and several different new types of *** fact,an EVOC is a kind of dynamic cipher designing ***,combined with intelligent searching algorithms and cryptography design policies,EVOCs utilize the dynamic and unpredictable properties of TRNG(a truly random number generator) to ensure cipher design at a high level of ***,with an EVOC we could design cryptography algorithms with high security to resist mathematical analysis as well as DPAs and *** paper analyzes and proves the security,efficiency,cost,and original features of EVOCs against DPA and DFA both theoretically and *** with existing countermeasures against SCAs,EVOCs use dynamic non-linear operations to destroy the bases of DPA and *** the algorithm level,EVOCs are more efficient than other resistance *** on the theory and experiments,this paper proposes certain modifications to the EVOC in the AES(advanced encryption standard) algorithm,which can be referenced by other dynamic designs of cryptographic algorithms.

关键词： evolutionary cipher DPA countermeasure DPA DFA countermeasure DFA SCA

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Disposable Electrochemical Biosensor for Amperometric Measurement of β-hydroxybutyrate and Total Cholesterol

引用

稀有金属材料与工程 2006年第S3期 305-308页

作者： Huaqing Li~(1,2) Li Wang~1 Nenggao Rao~1 Dafu Cui~1 Xinxia Cai~(1,2) (1.State key laboratory of Transducer Technology,Institute of Electronics,chinese {3. of {3.,Beijing 100080,China) (2.Graduate School of chinese {3. of Science,Beijing 100080,China)

A new type of disposable thin-film amperometric biosensor has been developed for measurement ofβ-hydroxybutyrate and total cholesterol in *** biosensor consists of two plain gold electrodes mounted on a Polyethylene terephthalate （PET） *** reagent solution contains bienzymes （cholesterol oxidase and cholesterol esterase for total cholesterol,β-hydroxybutyrate dehydrogenase and diaphorase forβ-hydroxybutyrate respectively） with mediator （ferricyanide） were absorption at the surface of electrodes coated by electrodepositing platinum *** presence of the mediator lowers the applied potential and eliminates the interference from other oxidizable species enhancing the sensitivity and selectivity of the biosensor without modifying the dynamic parameters of the *** enzymes stably retains in the matrices of platinum black film improving the performance of the mediated *** linearity is observed in the concentration range from 1.0×10-4to 1.0×10-2mM and 1.0×10-4mM to 4.99×10-3.M with sensitivity of 1.958μA/mM and 2.447μA/mM *** optimized biosensor exhibits excellent reproducibility and stability retaining more than 90% of its original activity over a period of one *** simple operation of the biosensor mass-produced at low cost is expected to find clinical application and homecare.

关键词： amperometric β-Hydroxybutyrate total cholesterol ferricyanide platinum black

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

dynamic CHARACTERISTIC OF SATURATED SILTY CLAY UNDER IMPACT LOADING

DYNAMIC CHARACTERISTIC OF SATURATED SILTY CLAY UNDER IMPACT ...

引用

中日岩土工程学术会议

作者： QING-SHAN MENG REN WANG LING-WEI KONG and MING-JIAN HU Assistant Professor key laboratory of Rock and Soil Mechanics chinese {3. of {3. wuhan 43.071 ChinaProfessor key laboratory of Rock and Soil Mechanics chinese {3. of {3. wuhan 43.071 ChinaProfessor key laboratory of Rock and Soil Mechanics chinese {3. of {3. wuhan 43.071 ChinaAssistant Professor key laboratory of Rock and Soil Mechanics chinese {3. of {3. wuhan 43.071 China

＜正＞ The method of dynamic Consolidation was applied for dozens of years, the satisfactory effect could be acquired that using dynamic consolidation by drainage to compact saturated silly soft clay foundation, this opinion was confirmed by more and more theory research and engineering *** saturated soft clay was applied to impact loading by dynamic consolidation equipment in {3.. And the dynamic characteristics of impact stress, pore water pressure and axial strain of saturated silty soft clay specimens were studied under different confining pressure and impact energy. The combination of hummer weight and dropping height is main influencing factor to the impact stress. The test shown that the development model between axial strain and impact number hyperbolic - logarithm function, and the relationship between pore water pressure and impact number hyperbolic function. Considering similarity of the model, the results of {3. test were compared with the data of field test, it is proved that the model could be simulating to on-site soft clay foundation compacting with dynamic consolidation method. The optimal impact frequency was ascertained by making use of the ratio between pore water pressure and axial strain. It has important theoretical significance and reference value that using {3. dynamic consolidation tests to simulate dynamic consolidation by drainage to compact soft clay foundation.

关键词： Impact Loading Saturated Soft Clay Axial Strain Pore Water Pressure

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A NUMERICAL STUDY ON A SIMPLIFIED TAIL MODEL FOR TURNING FISH IN C-START

引用

Journal of Hydrodynamics 2006年第2期18卷 135-142页

作者： YANG Yan TONG Bing-gang The laboratory for Biomechanics of Animal Locomotion Graduate University of Chinese Academy of SciencesBeijing 100049 China Department of Mechanics and Mechanical Engineering University of Science and Technology of China Hefei230026 China

Most freshwater fish are good at turning manoeuvres. A simulated fish tail model was numerically investigated and discussed in detail. This study deals with unsteady forces and moment exerted on the fish tail-fin in an initial sideways stroke and a subsequent return stroke motion, and visualizes the flow fields and vortex structures, in order to explore the flow control mechanism of the typical turning motion of fish. Further discussion on fluid dynamic consequences corresponding to two different bending forms of fish tail-fins in its C-start is given. The two-dimensional unsteady incompressible Navier-Stokes equations are solved with a developed pseudo-compressibility method to simulate the flow around the fish tail-fin. The computed results and the comparison with experiments indicate that （1） fish performs a turning motion of its body using the impulsive moment produced by the to-and-fro stroke, and each stage of the process exhibits its specific hydrodynamic characteristic, （2） fishes adopt two forms of tail-tip bend （single bend and double bend） to accomplish a C-start turning manoeuvre, in dependence of their physical situations and natural environments, （3. fish can control its turning motion by modulating some key kinematic parameters.

关键词： fish swimming turning manoeuvre C-start,tail fin locomotion 2D Navier-Stokes equations CFD physical mechanism optimal control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Several significant hydrographic characteristics and their formation mechanism in the South China Sea during the spring and summer of 1998

引用

Acta Oceanologica Sinica 2003年第4期22卷 491-502页

作者： Xu Jianping 1,2,Chai Fei 2,3.Liu Zenghong 1,2,Zhu Bokang 1,2 1.Second Institute of Oceanography,State Oceanic Administration,Hangzhou 3.0012,China. 2.key laboratory of Ocean dynamic Processes and Satellite Oceanography of State Oceanic Administration, Hangzhou 3.0012, China 3.School of Marine Science, University of Maine, Orono, ME 04469-5741,USA Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China key Lab. of Ocean dynamic Processes Hangzhou 310012 China School of Marine Science University of Maine Orono ME 04469-5741 United States

dOn the basis of the CTD data obtained by the two cruises before and after summer monsoon burst (25th May, 1998), several significant hydrographic characteristics, their variation and formation mechanism in the South China Sea (SCS) are analyzed. The results show that the Kuroshio water intrudes into the SCS in the form of loop current, and its main part is limited to the east of 118degreesE near the Luzon Strait. Then it continuously extends westwards under the influence of the large-scale circulation, and has a distinct impact on the area north of 16degreesN. There are two high temperature and low salinity regions: west off Luzon and east off Vietnam respectively. One region west off Luzon strengthens obviously after summer monsoon burst, the other east off Vietnam shows a tendency of weakening in the north and strengthening in the south. The formation of these two high temperature and low salinity regions is related to the anti-cyclonic eddies existing in this area, besides, it is also related to the high temperature feature west of Luzon, the influx of Sulu Sea water and the influence of the large-scale air circulation. There is a cold region below the depth of 50 m in the south of Zhongsha Islands, and it strengthens after monsoon burst. The formation of cold water is related to the upwelling there.

关键词： monsoon burst hydrographic characteristics Kuroshio Luzon Strait South China Sea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Origin Distribution Patterns and Floating Population Modeling:Yiwu City as a Destination

引用

chinese Geographical Science 2012年第3期22卷 367-380页

作者： LI Hongsheng WANG Yingjie HAN Jiafu State key Laboratoty of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Existing quantitative migration studies are mainly at the inter-region or inter-province level for lacking of detailed geo-referenced migration ***,few of them integrate explorative spatial data analysis and spatial regression model into migration *** on aggregated registered floating population data from 2005 to 2008,the phenomena that population floating to Yiwu City in Zhejiang Province is analyzed at the provincial and county *** spatial layout of Yiwu's pull forces is proved as a V-shaped pattern excluding Sichuan Province based on map visualization *** the migration ratio in 2007 as an explanatory variable,two models are compared using ordinary least square,spatial error model and spatial lag model methods for county-level data in Jiangxi and Anhui *** model with migration stock provides an improved fitting over the model without migration stock according to the model fitting *** floating population flocking into Yiwu City from Jiangxi is determined mostly by migration stock while the determinant factors are migration stock and distance to Yiwu City for *** distance-decay effect is true for migration flow from Anhui to Yiwu City while the distance rule is not confirmed in Jiangxi with the best fitting *** correlation between per capita net income of rural labor forces and migration ratio is not significant in Jiangxi and significant but at the 0.1 level only in *** analysis shows that the distance,income and man-land ratio are important factors to explain population floating at earlier ***,as the dynamic population floating process evolves,the determinant factor would be migration stock.

关键词： floating population origin distribution visualization spatial regression model Yiwu City GIS

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

STRESS-INDUCED CRYSTALLIZATION OF POLYURETHANE/MONTMORILLONITE NANOCOMPOSITE

引用

chinese Journal of Polymer Science 2002年第5期20卷 481-483页

作者： Xin-hua Dai Xiang-dong Luo Qun Gu Xiao-li Zhang De-yan Shen Liang-he Shi Jian Xu State key laboratory of Polymer Physics and Chemiscy Center for Molecular Science, Institute of Chemistry,chinese {3. of {3., Beijing 100080, China Center for Molecular Science Institute of Chemistry Chinese Academy of Sciences State Key Laboratory of Polymer Physics and Chemistry 北京 100080

Exfoliated polyurethane/montmorillonite nanocomposites with both high elongation at break and high tensilestrength were studied by dynamic-infrared spectroscopy (dynamic-IR). The results show that crystallization indu... 详细信息

关键词： PU/montmorillonite nanocomposite dynamic-IR crystallization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

EXPERIMENTS OF SEA ICE SIMULATION

引用

Journal of Hydrodynamics 2005年第6期17卷 686-692页

作者： LIU Xi-ying State key laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid {3.s （LASG） Institute of Atmospheric Physics （IAP） Chinese Academy of Sciences Beijing 100029 China

As a substitute for the original displaced pole grids, a simple rotated spherical coordinate system was intro duced into the Community Sea Ice Model version 4（CSIM4）, which is a component of the Community Climate System Model（CCSM） of the American National Center of Atmospheric Researeh（NCAR）, to deal with the ＂pole problems＂. In the new coordinates, both the geographical North Pole and South Pole lie in the model equator and grid sizes near the polar region are more uniform. With reanalysis dataset of American National Centers for Environment Prediction （NCEP） and Levitus dataset without considering sub-mixed layer heat flux, the model was integrated for 100 years with thermodynamics *** involved only in the former 49 years and both dynamic and thermodynamic processes involved in the left time. Inner consistency of model results was checked with no contradiction found. The results of last 10 years＇ model output were analyzed and it is shown that the simulated sea ice seasonal variation is rational whereas sea ice extent in the Barcnts Sea in winter is larger than that of observation, Numerical experiment on influence of sub-mixed layer heat flux was also carried out and it is shown that the sub-mixed layer heat flux can modulate seasonal variation of sea ice greatly. As a model component, the sea ice model with rotated spherical coordinates was coupled with other models （the oceanic general cir culation model is the LASG/IAP Climate System Ocean Model （LICOM） with reduced grid, other models are components of NCAR CCSM2） forming a climate system model and its preliminary results were also given briefly.

关键词： sea ice numerical simulation climate system model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Estimation of Sand Transportation Rate for Fixed and Semi-Fixed Dunes Using Meteorological Wind Data

引用

Pedosphere 2009年第1期19卷 129-136页

作者： HU Xia LIU Lian-You LI Shun-Jiang XIAO Bi-Lin LIU Mu-Xin key Lab of Environment Change and Natural Disaster Ministry of Education Beijing Normal Univeristy Beijing 100875 （China） academy of Disaster Reduction and Emergency Management Ministry of Civil Affairs/Ministry of Education Beijing Normal University Beijing 100875 （China） State key laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 21008 （China） Institute of Plant Nutrition and Resources Beijing Academy of Agriculture and Forestry Sciences Beijing 100097 （China） Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 （China）

Taibus County, Inner Mongolia, China, lies in a farming-pastoral ecotone, where severe wind erosion and various aeolian sand hazards are prevalent and fixed and semi-fixed sand dunes occur frequently. This study was conducted to investigate the relationships between sand transportation rate and wind speed for the fixed and semi-fixed sand dunes based on field measurements. The annual quantity of soil erosion by wind was estimated using meteorological wind data. The results indicated that the sand transportation rate in Taibus County in 2000 was 57.3. kg cm-1 year-1 for the semi-fixed dunes and 4.56 kg cm-1 year-1 for the fixed dunes. The total duration of erosive winds covered 12.5% of the time of the year, and spring posed the highest potential of sand transportation. Wind with low speed (≤ 17 m s-1) and high frequency plays a dominant role in sand transportation, while strong wind (≥ 17 m s-1) with low frequency significantly enhanced the sand transportation. Erosive wind speed, directions, and frequency were three crucial dynamic factors influencing sand hazards in the farming-pastoral ecotone. The dominant factors intensifying sand and dust storms in Taibus County might be related to the favorable wind condition in combination with the durable drought, which led to land desertification and vegetation degradation.

关键词： fixed and semi-fixed dunes meteorological wind data sand transportation rate wind erosion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multi-peak Phenomenon of Insect Cell Infection with Baculovirus at Low Multiplicity of Infection

引用

Acta Biochimica et Biophysica Sinica 2005年第12期37卷 857-861页

作者： You-Hong ZHANG~(1,2) Hubei key laboratory of Novel Chemical Reactor & Green Chemical Technology,wuhan Institute of Technology,wuhan 43.073.China,Department fo Biotechnology Engineering,Ben-Gurion University of the Negev,Beer-Steva 84105,Israel Hubei key laboratory of Novel Chemical Reactor & Green Chemical Technology Wuhan Institute of TechnologyWuhan 430073 China Department of Biotechnology Engineering Ben-Gurion University of the NegevBeer-Sheva 84105 Israel

In this communication we report the infection of armyworm Spodopterafrugiperda IPLB-Sf-21 cells with Anticarsia gemmatalis multicapsid nucleopolyhedrovirus at low multiplicity of infection (MOI).The temporal variation of the extra-cellular virus and of the unstained cell was *** series of peaksin the virus concentration and the unstained cells count were used in order to infer the dynamic mechanismof the infection at low *** mechanism can be used as the basis for the future formulation of amathematical model of the process.

关键词： insect cell Anticarsia gemmatalis multicapsid nucleopolyhedrovirus(AgMNPV) infection multiplicity of infection(MOI) dynamics

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：