Most view articles
2011(1):23-27.
Abstract:
In order to solve the sudoku more efficiently,a novel approach was proposed.We employed the realnumber coding to get rid of the integer constraint,meanwhile used the L0norm to guarantee the sparsity of the solution.Moreover,the L1norm was used to approximate the L0norm on the basis of RIP and KGG condition.Finally,the slack vectors were introduced to transfer the L1norm into a convex linear programming problem,which was solved by the primaldual interior point method.Experiments demonstrate that this algorithm reach 100％ success rate on easy,medium,difficult,and evil levels,and reach 864％ success rate on only 17clue sudokus.Besides,the average computation time is quite short,and has nothing to do with the difficulty of sudoku itself.In all,this algorithm is superior to both constraint programming and Sinkhorn algorithm in terms of success rate and computation time.
In order to solve the sudoku more efficiently,a novel approach was proposed.We employed the realnumber coding to get rid of the integer constraint,meanwhile used the L0norm to guarantee the sparsity of the solution.Moreover,the L1norm was used to approximate the L0norm on the basis of RIP and KGG condition.Finally,the slack vectors were introduced to transfer the L1norm into a convex linear programming problem,which was solved by the primaldual interior point method.Experiments demonstrate that this algorithm reach 100％ success rate on easy,medium,difficult,and evil levels,and reach 864％ success rate on only 17clue sudokus.Besides,the average computation time is quite short,and has nothing to do with the difficulty of sudoku itself.In all,this algorithm is superior to both constraint programming and Sinkhorn algorithm in terms of success rate and computation time.
2010(3):221-229.
Abstract:
利用ＷＰＳ（宽范围颗粒粒径谱仪）、ＡｎｄｅｒｓｏｎⅡ型９级撞击采样器测量了２００８年夏季典型日南京钟山风景区、鼓楼商业区与江北工业区大气气溶胶数浓度谱分布和质量浓度，分析了城市不同功能区气溶胶粒子的分布特征．结果表明：各功能区大气颗粒物浓度均比较高，达到１０４ｃｍ－３，数浓度谱均为单峰型，峰值集中在００１～００４μｍ；其中气溶胶粒子数浓度主要集中在００１～０２μｍ粒径范围内，其日变化受汽车尾气排放、混合层高度变化的影响较大，且呈现明显的双峰型；粒径为００１～０１μｍ的超细粒子对总数粒子贡献较大，鼓楼为９３２８％，江北为８１６６％，钟山为６６５２％；细粒子（粒径＜１１μｍ）与ＴＳＰ质量浓度的比值钟山为９２％，鼓楼３３７７％， 江北２４９８％；质量浓度主要为粗粒子（粒径≥１１μｍ）贡献，但是鼓楼与江北的细粒子的贡献也非常大，说明这两个功能区的细粒子的污染值得关注；数浓度和相对湿度（ＲＨ）有密切联系，当ＲＨ＜７５％时其峰值随着相对湿度的增大而增大，当ＲＨ＞７５％时其峰值随着相对湿度的增大而减少，并且相对湿度对细粒子的影响要大于对大粒子的影响．
利用ＷＰＳ（宽范围颗粒粒径谱仪）、ＡｎｄｅｒｓｏｎⅡ型９级撞击采样器测量了２００８年夏季典型日南京钟山风景区、鼓楼商业区与江北工业区大气气溶胶数浓度谱分布和质量浓度，分析了城市不同功能区气溶胶粒子的分布特征．结果表明：各功能区大气颗粒物浓度均比较高，达到１０４ｃｍ－３，数浓度谱均为单峰型，峰值集中在００１～００４μｍ；其中气溶胶粒子数浓度主要集中在００１～０２μｍ粒径范围内，其日变化受汽车尾气排放、混合层高度变化的影响较大，且呈现明显的双峰型；粒径为００１～０１μｍ的超细粒子对总数粒子贡献较大，鼓楼为９３２８％，江北为８１６６％，钟山为６６５２％；细粒子（粒径＜１１μｍ）与ＴＳＰ质量浓度的比值钟山为９２％，鼓楼３３７７％， 江北２４９８％；质量浓度主要为粗粒子（粒径≥１１μｍ）贡献，但是鼓楼与江北的细粒子的贡献也非常大，说明这两个功能区的细粒子的污染值得关注；数浓度和相对湿度（ＲＨ）有密切联系，当ＲＨ＜７５％时其峰值随着相对湿度的增大而增大，当ＲＨ＞７５％时其峰值随着相对湿度的增大而减少，并且相对湿度对细粒子的影响要大于对大粒子的影响．
2010(3):280-283.
Abstract:
在时间序列建模时，随机扰动项经常表现出非高斯性质，造成传统的时序模型的估计和预测偏误．针对这个问题，提出一种新的时间序列混合模型———多维高斯混合转移分布模型（ＭＧＭＴＤ模型），用来处理残差项不是白噪声的情况，并提出采用遗传算法进行参数估计．将新提出的ＭＧＭＴＤ模型应用于对国际原油价格的预测分析中，进行模型的可行性检验．实证结果显示，ＭＧＭＴＤ模型可以得到较好的预测结果．
在时间序列建模时，随机扰动项经常表现出非高斯性质，造成传统的时序模型的估计和预测偏误．针对这个问题，提出一种新的时间序列混合模型———多维高斯混合转移分布模型（ＭＧＭＴＤ模型），用来处理残差项不是白噪声的情况，并提出采用遗传算法进行参数估计．将新提出的ＭＧＭＴＤ模型应用于对国际原油价格的预测分析中，进行模型的可行性检验．实证结果显示，ＭＧＭＴＤ模型可以得到较好的预测结果．
2010(3):211-215.
Abstract:
通过模拟案例对设施选址中的中值问题、中心问题、覆盖问题等建立模型并进行分析，再引入诸如气象要素、地形要素等约束条件，用层次分析等方法建立设施选址综合目标函数，并对设施选址方法提出一些建议．
通过模拟案例对设施选址中的中值问题、中心问题、覆盖问题等建立模型并进行分析，再引入诸如气象要素、地形要素等约束条件，用层次分析等方法建立设施选址综合目标函数，并对设施选址方法提出一些建议．
2009(1):1-15.
Abstract:
根据个人学习研究稳定性的心得体会，首先介绍了前苏联伟大的数学力学家Ｌｙａｐｕｎｏｖ院士的博士论文《运动稳定性的一般问题》在全世界产生的超过１个世纪的巨大影响．叙述了由该博士论文首创的几个巨大成就何以能奠定１门学科的基础，从而开创了１个新的重要的研究方向，以及留给后人很多很多研究的课题的理由．特别地，用事实和科学断语回答了“Ｌｙａｐｕｎｏｖ稳定性已领风骚１００多年，余晖还几何”的问题．明确表明１个观点：稳定性将是１个“永恒的主题”，不老的科学，定将永恒地给人启迪，洞察力，智慧和思想．
根据个人学习研究稳定性的心得体会，首先介绍了前苏联伟大的数学力学家Ｌｙａｐｕｎｏｖ院士的博士论文《运动稳定性的一般问题》在全世界产生的超过１个世纪的巨大影响．叙述了由该博士论文首创的几个巨大成就何以能奠定１门学科的基础，从而开创了１个新的重要的研究方向，以及留给后人很多很多研究的课题的理由．特别地，用事实和科学断语回答了“Ｌｙａｐｕｎｏｖ稳定性已领风骚１００多年，余晖还几何”的问题．明确表明１个观点：稳定性将是１个“永恒的主题”，不老的科学，定将永恒地给人启迪，洞察力，智慧和思想．
2011(4):324-330.
Abstract:
To improve the accuracy and reliability of driving fatigue detection,three typical color characters are selected to construct the Fisher classifier for extracting lip region based on chroma distribution diversity.Region connecting algorithm is used to filter the noise in binary lip area.Improved integral projection algorithm is adopted to locate the lip boundary.Whether drivers are fatigued is recognized by the open-close degree of mouth and yawning frequency.Experiments show that the Fisher classifier based on three color characters has obvious superiority over that based on single color character in lip color extraction,the improved integral projection algorithm can enhance the accuracy and speed of locating lip boundary,and the driving fatigue detection based on yawning frequency has better accuracy and reliability.Fusing multi-color characters can promote the detection result of driving fatigue on the premise of ameliorating the robustness and reliability of lip color extraction.
To improve the accuracy and reliability of driving fatigue detection,three typical color characters are selected to construct the Fisher classifier for extracting lip region based on chroma distribution diversity.Region connecting algorithm is used to filter the noise in binary lip area.Improved integral projection algorithm is adopted to locate the lip boundary.Whether drivers are fatigued is recognized by the open-close degree of mouth and yawning frequency.Experiments show that the Fisher classifier based on three color characters has obvious superiority over that based on single color character in lip color extraction,the improved integral projection algorithm can enhance the accuracy and speed of locating lip boundary,and the driving fatigue detection based on yawning frequency has better accuracy and reliability.Fusing multi-color characters can promote the detection result of driving fatigue on the premise of ameliorating the robustness and reliability of lip color extraction.
2010(5):410-413.
Abstract:
设计了一个三维声源定位系统，提出了一个新的系统模型，并对传统的基于声波到达时间差TDOA的算法进行了优化。通过检测麦克风接收到信号的时间差，结合已知的阵列元的空间位置确定声源的位置。该系统声源采集部分由4个阵列成正四面体的麦克风组成。算法的硬件实现由TMS320C5416DSP芯片完成'整个系统实现了声源定位的功能。
设计了一个三维声源定位系统，提出了一个新的系统模型，并对传统的基于声波到达时间差TDOA的算法进行了优化。通过检测麦克风接收到信号的时间差，结合已知的阵列元的空间位置确定声源的位置。该系统声源采集部分由4个阵列成正四面体的麦克风组成。算法的硬件实现由TMS320C5416DSP芯片完成'整个系统实现了声源定位的功能。
2014, 6(5):405-419.
Abstract:
With the rapid development of internet of things,cloud computing,and mobile internet,the rise of Big Data has attracted more and more concern,which brings not only great benefits but also crucial challenges on how to manage and utilize Big Data better.This paper describes the main aspects of Big Data including definition,data sources,key technologies,data processing tools and applications,discusses the relationship between Big Data and cloud computing,internet of things and mobile internet technology.Furthermore,the paper analyzes the core technologies of Big Data,Big Data solutions from industrial circles,and discusses the application of Big Data.Finally,the general development trend on Big Data is summarized.The review on Big Data is helpful to understand the current development status of Big Data,and provides references to scientifically utilize key technologies of Big Data.
With the rapid development of internet of things,cloud computing,and mobile internet,the rise of Big Data has attracted more and more concern,which brings not only great benefits but also crucial challenges on how to manage and utilize Big Data better.This paper describes the main aspects of Big Data including definition,data sources,key technologies,data processing tools and applications,discusses the relationship between Big Data and cloud computing,internet of things and mobile internet technology.Furthermore,the paper analyzes the core technologies of Big Data,Big Data solutions from industrial circles,and discusses the application of Big Data.Finally,the general development trend on Big Data is summarized.The review on Big Data is helpful to understand the current development status of Big Data,and provides references to scientifically utilize key technologies of Big Data.
2011(1):1-22.
Abstract:
System identification is the theory and methods of establishing mathematical models of systems.The mathematical modeling has a long research history,but the system identification discipline has only several tens of years.In this short decades,system identification has achieved great developments,new identification methods are born one after another,and the research results cover the theory and applications of natural science and social sciences,including physics,biology,earth science,meteorology,computer science,economics,psychology,political science and so on.In this context,we come back to ponder some basic problems of system identification,which is not without benefits for the development of system identification.This is a paper of an introduction to system identification which briefly introduces the definition of identification,system models and identification models,the basic steps and purposes of identification,including the experimental design of identification and data preprocessing,and the types of identification methods,including the least squares identification methods,gradient identification methods,auxiliary model based identification methods,and multiinnovation identification methods,and hierarchical identification methods,etc
System identification is the theory and methods of establishing mathematical models of systems.The mathematical modeling has a long research history,but the system identification discipline has only several tens of years.In this short decades,system identification has achieved great developments,new identification methods are born one after another,and the research results cover the theory and applications of natural science and social sciences,including physics,biology,earth science,meteorology,computer science,economics,psychology,political science and so on.In this context,we come back to ponder some basic problems of system identification,which is not without benefits for the development of system identification.This is a paper of an introduction to system identification which briefly introduces the definition of identification,system models and identification models,the basic steps and purposes of identification,including the experimental design of identification and data preprocessing,and the types of identification methods,including the least squares identification methods,gradient identification methods,auxiliary model based identification methods,and multiinnovation identification methods,and hierarchical identification methods,etc
2010(3):256-261.
Abstract:
采用连续逼近法及交通周转量计算方法，在分析城市微观土地利用模式的基础上，构建了一个将城市土地利用与碳排放相结合的数字评测模型．依据该模型，以南京信息工程大学为例，对双园区土地利用模式带来的“无为”碳排放进行了评测．结果表明，该评测模型可以对微观土地利用背景下双园区单位由于所采用交通方式不同而带来的碳排放量进行量化研究．
采用连续逼近法及交通周转量计算方法，在分析城市微观土地利用模式的基础上，构建了一个将城市土地利用与碳排放相结合的数字评测模型．依据该模型，以南京信息工程大学为例，对双园区土地利用模式带来的“无为”碳排放进行了评测．结果表明，该评测模型可以对微观土地利用背景下双园区单位由于所采用交通方式不同而带来的碳排放量进行量化研究．
2013, 5(5):385-396.
Abstract:
Recently,coordinated control of multi-agent systems has been a hot topic in the control field,due to its wide application in cooperative control of multiple autonomous vehicles,traffic control of vehicles,formation control of unmanned aircrafts,resource allocation in networks and so on.Firstly,the introduction of background about multi-agent systems,the concepts of agents and the knowledge of the graph theory has been given.And then research status of swarming/flocking problems,formation control problems,consensus problems and network optimization are summarized and analyzed at home and abroad,including coordination control of multi-agent systems.Finally,some problems about multi-agent systems to be solved in future are proposed,in order to urge deep study on the theory and application in coordinated control of multi-agent systems.
Recently,coordinated control of multi-agent systems has been a hot topic in the control field,due to its wide application in cooperative control of multiple autonomous vehicles,traffic control of vehicles,formation control of unmanned aircrafts,resource allocation in networks and so on.Firstly,the introduction of background about multi-agent systems,the concepts of agents and the knowledge of the graph theory has been given.And then research status of swarming/flocking problems,formation control problems,consensus problems and network optimization are summarized and analyzed at home and abroad,including coordination control of multi-agent systems.Finally,some problems about multi-agent systems to be solved in future are proposed,in order to urge deep study on the theory and application in coordinated control of multi-agent systems.
2010(5):385-391.
Abstract:
Based on the Banach contraction mapping principe,the existence and uniqueness of a class of gene regulatory network with SUM logic was discussed.Combined with the actual background of gene regulatory nelworks, the equilibrium point of the Lyapunoy stability was analyzed and several sufficient conditions were obtained.
Based on the Banach contraction mapping principe,the existence and uniqueness of a class of gene regulatory network with SUM logic was discussed.Combined with the actual background of gene regulatory nelworks, the equilibrium point of the Lyapunoy stability was analyzed and several sufficient conditions were obtained.
2010(5):436-444.
Abstract:
利用中尺度模式MM5对2009年冬季山西省一场持续30多个小时的罕见浓雾过程进行模拟。结果表明,山西省气象局现行的MM5设计方案对雾区的模拟结果与实测结果基本一致,但夜间近地层的温度存在冷偏差&相对湿度偏高.另外,由于山西省空气污染较重,空气中的粒子数对能见度的影响不能忽略,因此仅用能见度(Vis)与液态水含量（LWC）的参数化方案估算的能见度，只有在浓雾时才与实测一致，具有很大的局限性；而利用能见度(Vis) 与相对湿度（RH）的参数化方案估算的能见度比实测值偏大，但在能见度的趋势预报上与实测值基本一致。用太原机场的实测资料对Vis-RH关系式进行修订后&其估算的能见度更加准确&可以为业务预报提供参考.
利用中尺度模式MM5对2009年冬季山西省一场持续30多个小时的罕见浓雾过程进行模拟。结果表明,山西省气象局现行的MM5设计方案对雾区的模拟结果与实测结果基本一致,但夜间近地层的温度存在冷偏差&相对湿度偏高.另外,由于山西省空气污染较重,空气中的粒子数对能见度的影响不能忽略,因此仅用能见度(Vis)与液态水含量（LWC）的参数化方案估算的能见度，只有在浓雾时才与实测一致，具有很大的局限性；而利用能见度(Vis) 与相对湿度（RH）的参数化方案估算的能见度比实测值偏大，但在能见度的趋势预报上与实测值基本一致。用太原机场的实测资料对Vis-RH关系式进行修订后&其估算的能见度更加准确&可以为业务预报提供参考.
2012, 4(4):351-361.
Abstract:
In recent years,cloud computing as a new computing service model has become a research hotspot in computer science.This paper is to give a brief analysis and survey on the current cloud computing systems from the definition,deployment model,characteristics and key technologies.Then,the major international and domestic research enterprises and application products on cloud computing are compared and analyzed.Finally,the challenges and opportunities in current research of cloud computing are discussed,and the future directions are pointed out.So,it will help to provide a scientific analysis and references for use and operation of cloud computing.
In recent years,cloud computing as a new computing service model has become a research hotspot in computer science.This paper is to give a brief analysis and survey on the current cloud computing systems from the definition,deployment model,characteristics and key technologies.Then,the major international and domestic research enterprises and application products on cloud computing are compared and analyzed.Finally,the challenges and opportunities in current research of cloud computing are discussed,and the future directions are pointed out.So,it will help to provide a scientific analysis and references for use and operation of cloud computing.
2011(2):149-154.
Abstract:
The paper presents a design of electronic cipher lock based on touch screen,which takes microprocessor LPC2132 of ARM7 as the core component to control the entire system.The paper makes detailed description about the design principle both of hardware and software.The system has some functions:password input,add,clear and display,when password is correct the system is unlock.Alarm when entering wrong password over three times,lock the keyboard and set the initial system when the input password is wrong or the input time is over.This design reduces the fault rate and improves the reliability,security and safety.Combined with touch screen,the electronic cipher lock works effectively and conveniently.
The paper presents a design of electronic cipher lock based on touch screen,which takes microprocessor LPC2132 of ARM7 as the core component to control the entire system.The paper makes detailed description about the design principle both of hardware and software.The system has some functions:password input,add,clear and display,when password is correct the system is unlock.Alarm when entering wrong password over three times,lock the keyboard and set the initial system when the input password is wrong or the input time is over.This design reduces the fault rate and improves the reliability,security and safety.Combined with touch screen,the electronic cipher lock works effectively and conveniently.
2011(1):91-96.
Abstract:
IIC bus is simulated by C51 program according to its time sequence.Based on this simulated IIC bus,a voltage measurement system is designed by the single chip microcomputer and 8bit A/D and D/A converter PCF8591.The PCF8591 is a singlechip,singlesupply low power 8bit CMOS data acquisition device with four analog inputs,one analog output and a serial IIC bus interface.Three address pins A0,A1 and A2 are used for programming the hardware address,allowing the use of up to eight devices connected to the IIC bus without additional hardware.Address,control and data to and from the device are transferred serially via the twoline bidirectional IIC bus.The functions of the PCF8591 include analog input multiplexing,onchip track and hold function,8bit analogtodigital conversion and an 8bit digitaltoanalog conversion.The maximum conversion rate is given by the maximum speed of the IIC bus.The circuit and main program flow chart are proposed in this paper.The system has simple structure and strong expandability owes to the IIC bus.It provides reference for the application of IIC bus in acquisition system.
IIC bus is simulated by C51 program according to its time sequence.Based on this simulated IIC bus,a voltage measurement system is designed by the single chip microcomputer and 8bit A/D and D/A converter PCF8591.The PCF8591 is a singlechip,singlesupply low power 8bit CMOS data acquisition device with four analog inputs,one analog output and a serial IIC bus interface.Three address pins A0,A1 and A2 are used for programming the hardware address,allowing the use of up to eight devices connected to the IIC bus without additional hardware.Address,control and data to and from the device are transferred serially via the twoline bidirectional IIC bus.The functions of the PCF8591 include analog input multiplexing,onchip track and hold function,8bit analogtodigital conversion and an 8bit digitaltoanalog conversion.The maximum conversion rate is given by the maximum speed of the IIC bus.The circuit and main program flow chart are proposed in this paper.The system has simple structure and strong expandability owes to the IIC bus.It provides reference for the application of IIC bus in acquisition system.
2011(2):167-173.
Abstract:
In the era that electronic materials based on the silicon \soutis developing to the peak,carbon nanotubes(CNTs) and Graphene nanoribbons(GNRs),which have excellent natures of conductor and semiconductor,will become the mainstream in replacing of silicon microelectronic materials.It is verified that CNTs and GNRs possess some advantages as microelectronic materials by a specification of their structure and electronic natures.The paper also listed several existing achievements and promising methods in the process of constructing microelectronic devices,as well as introduced the methods of preparation of corresponding CNTs and GNRs.
In the era that electronic materials based on the silicon \soutis developing to the peak,carbon nanotubes(CNTs) and Graphene nanoribbons(GNRs),which have excellent natures of conductor and semiconductor,will become the mainstream in replacing of silicon microelectronic materials.It is verified that CNTs and GNRs possess some advantages as microelectronic materials by a specification of their structure and electronic natures.The paper also listed several existing achievements and promising methods in the process of constructing microelectronic devices,as well as introduced the methods of preparation of corresponding CNTs and GNRs.
2010(4):357-360.
Abstract:
A method of high order accurate resolution is proposed to track moving-interface using VOF,the fifth order WENO scheme for space discretization,the local Lax-Friedrichs numerical flux and fourth order Runge-kutta method for time discretization are used in the methods for tracking the moving-interfaces.A high-resolution method is proposed to track moving surface using VOF(Volume Of Fluid).The finite difference scheme of fifth order highaccuracy and high-resolution WENO(Weighted Essentially Non-Oscillatory) i...
A method of high order accurate resolution is proposed to track moving-interface using VOF,the fifth order WENO scheme for space discretization,the local Lax-Friedrichs numerical flux and fourth order Runge-kutta method for time discretization are used in the methods for tracking the moving-interfaces.A high-resolution method is proposed to track moving surface using VOF(Volume Of Fluid).The finite difference scheme of fifth order highaccuracy and high-resolution WENO(Weighted Essentially Non-Oscillatory) i...
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