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| 1 | 虚拟现实综述显示文摘虚拟现实是人类在探索自然过程中创造形成的一种用于认识自然、模拟自然,进而更好地适应和利用自然的科学方法和技术.文中在分析虚拟现实全过程的基础上,给出虚拟现实问题的不同分类及一种理论表达,并抽象出虚拟现实领域的三大科学技术问题类;在此基础上从虚拟现实中的建模方法、虚拟现实表现技术、人机交互及设备、虚拟现实开发平台与支撑环境和虚拟现实应用等几个方面论述了虚拟现实当前的主要研究目标、研究成果和发展趋势;最后指出虚拟现实需要进一步致力研究解决的若干理论和技术问题. | 赵沁平 | 2009 | 中国科学(F辑:信息科学)2009，39，1： | 632 |
| 2 | 论新地理信息时代显示文摘随着Google Earth、MSN Virtual Earth、下一代互联网、Web 2.0和网格计算技术的出现,一个新的地理信息时代悄然而来.文中研究了新地理信息时代的典型特征,如服务对象扩大到大众用户、用户同时是空间数据和信息的提供者、传感器网络将数据从死变活、按需求提供服务等,分析了新地理信息时代将带来的地理数据组织无序、质量更新、服务安全、信息爆炸、共享隐私和产权等问题对地球信息科学和地理信息产业的影响,并从标准、规划、法律、技术和应用等方面探讨了积极的应对策略. | 李德仁 邵振峰 | 2009 | 中国科学(F辑:信息科学)2009，39，6： | 106 |
| 3 | Research progress of the fractional Fourier transform in signal processing显示文摘The fractional Fourier transform is a generalization of the classical Fourier transform, which is introduced from the mathematic aspect by Namias at first and has many applications in optics quickly. Whereas its potential appears to have remained largely unknown to the signal processing community until 1990s. The fractional Fourier transform can be viewed as the chirp-basis expansion directly from its definition, but es-sentially it can be interpreted as a rotation in the time-frequency plane, i.e. the unified time-frequency transform. With the order from 0 increasing to 1, the fractional Fourier transform can show the characteristics of the signal changing from the time domain to the frequency domain. In this research paper, the fractional Fourier transform has been com-prehensively and systematically treated from the signal processing point of view. Our aim is to provide a course from the definition to the applications of the fractional Fourier transform, especially as a reference and an introduction for researchers and interested readers. | TAO Ran DENG Bing WANG Yue | 2006 | Science in China(Series F)2006，49，1： | 99 |
| 4 | Detection and parameter estimation of multicomponent LFM signal based on the fractional Fourier transform显示文摘This paper presents a new method for the detection and parameter estimation of multicomponent LFM signals based on the fractional Fourier transform. For the optimization in the fractional Fourier domain, an algorithm based on Quasi-Newton method is proposed which consists of two steps of searching, leading to a reduction in computation without loss of accuracy. And for multicomponent signals, we further propose a signal separation technique in the fractional Fourier domain which can effectively suppress the interferences on the detection of the weak components brought by the stronger components. The statistical analysis of the estimate errors is also performed which perfects the method theoretically, and finally, simulation results are provided to show the validity of our method. | QI Lin1, 2, TAO Ran1, ZHOU Siyong1 & WANG Yue1 1. Department of Electronic Engineering, Beijing Institute of Technology, Beijing 100081, China 2. School of Information Engineering, Zhengzhou University, Zhengzhou 450052, China Correspondence should be addressed to QI Lin (email: qilin@bit.edu.cn) | 2004 | Science in China(Series F)2004，47，2： | 143 |
| 5 | Attribute reduction theory and approach to concept lattice显示文摘The theory of the concept lattice is an efficient tool for knowledge representation and knowledge discovery, and is applied to many fields successfully. One focus of knowledge discovery is knowledge reduction. This paper proposes the theory of attribute reduction in the concept lattice, which extends the theory of the concept lattice. In this paper, the judgment theorems of consistent sets are examined, and the discernibility matrix of a formal context is introduced, by which we present an approach to attribute reduction in the concept lattice. The characteristics of three types of attributes are analyzed. | ZHANG Wenxiu WEI Ling QI Jianjun | 2005 | Science in China(Series F)2005，48，6： | 70 |
| 6 | Function S-rough sets and law identification显示文摘By introducing element equivalence class that proposes dynamic characteristic into Pawlak Z rough sets theory, the first author of this paper improved Pawlak Z rough sets and put forward S-rough sets (singular rough sets). S-rough sets are defined by element equivalence class that proposes dynamic characteristic. S-rough sets have dynamic characteristic. By introducing the function equivalence class (law equivalence class) that proposes dynamic characteristic into S-rough sets, the first author improved S-rough sets and put forward function S-rough sets (function singular rough sets). Function S-rough sets have dynamic characteristic and law characteristic, and a function is a law. By using function S-rough sets, this paper presents law identification, law identification theorem, and law identification criterion and applications. Function S-rough sets are a new research direction of rough sets theory, and it is also a new tool to the research of system law identifica- tion. | SHI KaiQuan YAO BingXue | 2008 | Science in China(Series F)2008，51，5： | 68 |
| 7 | Function S-rough sets and security-authentication of hiding law显示文摘Function S-rough sets are defined by R-function equivalence class, which have dynamic characteristic. Function S-rough sets have dynamic characteristic, law characteristic and law-hiding characteristic. Function S-rough sets can generate f-hiding law and - hiding law. By engrafting, crossing, and penetrating between the information security theory and function S-rough sets, the security hiding and the authentication of f- hiding law and - hiding law are given respectively in this paper. The fusion and share between function S-rough sets and information security theory is a new research direction of the application of information law in information system. | SHI KaiQuan1,2 & ZHAO JianLi3 1 School of Mathematics and Computer Sciences, Longyan University, Longyan 364000, China 2 School of Mathematics and System Sciences, Shandong University, Jinan 250100, China 3 School of Mathematics Science, Liaocheng University, Liaocheng 252059, China | 2008 | Science in China(Series F)2008，51，7： | 69 |
| 8 | Mathematic principles of interrupted-sampling repeater jamming (ISRJ)显示文摘Coherent jamming is one of the important trends in modern radar electronic war- fare. High-speed sampling of wideband radio frequency (RF) signals and high iso- lation of two receive-transmit antennas are key technologies for the realization of coherent jamming. However, these technologies present significant challenges to engineering application. In this paper, a novel repeater jamming based on inter- rupted sampling technique is presented. For a jammer with a receive-transmit time-sharing antenna, a radar signal is sampled with a low rate by the jammer. Then, a train of false targets will be achieved after the jamming signal feed the matched filter of a pulse compression radar. For the case of the linear frequency modulated (LFM) pulse compression radars, mathematic principles of the interrupted-sam- pling repeater jamming is developed, and then the efficiency of the jamming is de- scribed and stated as expressions of key parameters which are also beneficial to the jamming design for other coherent radars. | WANG XueSong LIU JianCheng ZHANG WenMing FU QiXiang LIU Zhong XIE XiaoXia | 2007 | Science in China(Series F)2007，50，1： | 53 |
| 9 | Semi-tensor product of matrices and its application to Morgen's problem显示文摘This paper proposes a new matrix product, namely, semi-tensor product. It is a generalization of the conventional matrix product. Meanwhile, it is also closely related to Kronecker (tensor) product of matrices. The purpose of introducing this product is twofold: (i) treat multi-dimensional data; (ii) treat nonlinear problems in a linear way. Then the computer and numerical methods can be easily used for solving nonlinear problems. Properties and formulas are deduced. As an application, the Morgen's problem for control systems is formulated as a numerically solvable problem. | 程代展 | 2001 | Science in China(Series F)2001，44，3： | 50 |
| 10 | Fractional differential approach to detecting textural features of digital image and its fractional differential filter implementation显示文摘This paper mainly discusses fractional differential approach to detecting textural features of digital image and its fractional differential filter. Firstly,both the geometric meaning and the kinetic physical meaning of fractional differential are clearly explained in view of information theory and kinetics,respectively. Secondly,it puts forward and discusses the definitions and theories of fractional stationary point,fractional equilibrium coefficient,fractional stable coefficient,and fractional grayscale co-occurrence matrix. At the same time,it particularly discusses fractional grayscale co-occurrence matrix approach to detecting textural features of digital image. Thirdly,it discusses in detail the structures and parameters of n×n any order fractional differential mask on negative x-coordinate,positive x-coordinate,negative y-coordinate,positive y-coordinate,left downward diagonal,left upward diagonal,right downward diagonal,and right upward diagonal,respectively. Furthermore,it discusses the numerical implementation algorithms of fractional differential mask for digital image. Lastly,based on the above-mentioned discussion,it puts forward and discusses the theory and implementation of fractional differential filter for digital image. Experiments show that the fractional differential-based image operator has excellent feedback for enhancing the textural details of rich-grained digital images. | PU YiFei WANG WeiXing ZHOU JiLiu WANG YiYang JIA HuaDing | 2008 | Science in China(Series F)2008，51，9： | 50 |
| 11 | Decrease-radix design principle for carrying/borrowing free multi-valued and application in ternary optical computer显示文摘In this paper a new theory referred to as the decrease-radix design (DRD) is pro-posed,which is found in the research of logic units of ternary (tri-valued) optical computer. Based on the theory proposed,the principles and the regulations of the DRD for making operation units of multi-valued operation with carrying/borrowing free are also presented. The research work has come to the following important conclusion: let D be a special state contained in n physical informative states,then one may figure out any multi-valued processors within n(n×n) carrying/borrowing free n-valued units by the composition some of n×n×(n-1) simplest basic operating units according to the regulations of DRD proposed in this paper. The detailed systematic way of our design regulations is highlighted step by step in the paper with an example of design of a tri-valued logic optical operating unit. The real ar-chitecture,the procedure,and the experimental results of our sample in tri-valued logic operating unit are given. Finally,a re-constructible model of ternary logical optical processor is introduced. The theory proposed in the paper has laid down a solid foundation for the design of re-constructible carrying/borrowing free operat-ing units in ternary optical computers and can be widely used as the designing reference in a variety of multi-valued logic operating units. | YAN JunYong JIN Yi ZUO KaiZhong | 2008 | Science in China(Series F)2008，51，10： | 41 |
| 12 | Information granules and entropy theory in information systems显示文摘Information granulation and entropy theory are two main approaches to research uncertainty of an information system,which have been widely applied in many practical issues. In this paper,the characterizations and representations of infor-mation granules under various binary relations are investigated in information systems,an axiom definition of information granulation is presented,and some existing definitions of information granulation become its special forms. Entropy theory in information systems is further developed and the granulation monoton-icity of each of them is proved. Moreover,the complement relationship between information granulation and entropy is established. This investigation unifies the results of measures for uncertainties in complete information systems and incom-plete information systems. | LIANG JiYe & QIAN YuHua Key Laboratory of Computational Intelligence and Chinese Information Processing,Ministry of Education School of Computer & Information Technology,Shanxi University,Taiyuan 030006,China | 2008 | Science in China(Series F)2008，51，10： | 41 |
| 13 | Constructing iterative non-uniform B-spline curve and surface to fit data points显示文摘In this paper, based on the idea of profit and loss modification, we present the iterative non-uniform B-spline curve and surface to settle a key problem in computer aided geometric design and reverse engineering, that is, constructing the curve (surface) fitting (interpolating) a given ordered point set without solving a linear system. We start with a piece of initial non-uniform B-spline curve (surface) which takes the given point set as its control point set. Then by adjusting its control points gradually with iterative formula, we can get a group of non-uniform B-spline curves (surfaces) with gradually higher precision. In this paper, using modern matrix theory, we strictly prove that the limit curve (surface) of the iteration interpolates the given point set. The non-uniform B-spline curves (surfaces) generated with the iteration have many advantages, such as satisfying the NURBS standard, having explicit expression, gaining locality, and convexity preserving, etc. | LINHongwei WANGGuojin DONGChenshi | 2004 | Science in China(Series F)2004，47，3： | 47 |
| 14 | 直觉模糊集和区间值模糊集的截集、分解定理和表现定理显示文摘该文给出了直觉模糊集和区间值模糊集的截集定义,建立了直觉模糊集和区间值模糊集的分解定理和表现定理.首先,将直觉模糊集的截集视为三值模糊集,给出了直觉模糊集的四类截集定义,指出这些截集是模糊集截集概念的推广且与模糊集的截集有完全一样的性质.其次,利用本文给出的截集概念,建立了直觉模糊集的分解定理和表现定理.指出直觉模糊集的每种截集都对应两种分解定理和表现定理,从而建立了直觉模糊集的八种分解定理和八种表现定理.最后,利用直觉模糊集的截集理论,给出了区间值模糊集的截集定义,并建立了区间值模糊集的八种分解定理和表现定理.这些工作为研究直觉模糊集和区间值模糊集建立了理论基础. | 袁学海 李洪兴 孙凯彪 | 2009 | 中国科学(F辑:信息科学)2009，39，9： | 36 |
| 15 | Ternary optical computer principle显示文摘The fundamental principle and the characteristics of ternary optical computer, using horizontal polarized light, vertical polarized light and no-intensity to express information, are propounded in thispaper. The practicability to make key parts of the ternary optical computer from modern micro or integrated optical devices, opto-electronic and electro-photonic elements is discussed. The principle can be applied in three-state optical fiber communication via horizontal and vertical polarized light. | 金翊 何华灿 吕养天 | 2003 | Science in China(Series F)2003，46，2： | 35 |
| 16 | A software architecture centric engineering approach for Internetware显示文摘As a new software paradigm evolved by the Internet, Internetware brings many challenges for the traditional software development methods and techniques. Though architecture-based component composition (ABC) approach is originated in the traditional software paradigm, it supports the engineering of Internetware effectively due to its philosophy, rationales and mechanisms. ABC has three major contributions to the en- gineering of Internetware in detail. First, the feature oriented domain modeling method can structure the “disordered”“software entities” to “ordered Internetware” bottom-up in the problem space. Second, the architecture centric design and analysis method can support the development of self-adaptive Internetware. Third, the component operating platform is a reflective and self-adaptive middleware that not only provides Internetware with a pow- erful and flexible runtime infrastructure but also enables the self-adaptation of the structure and individual entities of Internetware. | MEI Hong HUANG Gang ZHAO Haiyan JIAO Wenpin | 2006 | Science in China(Series F)2006，49，6： | 37 |
| 17 | Survey of information security显示文摘The 21st century is the age of information when information becomes an important strategic resource. The information obtaining, processing and security guarantee capability are playing critical roles in comprehensive national power, and information security is related to the national security and social stability. Therefore, we should take measures to ensure the information security of our country. In recent years, momentous accomplishments have been obtained with the rapid development of information security technology. There are extensive theories about information security and technology. However, due to the limitation of length, this article mainly focuses on the research and development of cryptology, trusted computing, security of network, and information hiding, etc. | SHEN ChangXiang ZHANG HuangGuo FENG DengGuo CAO ZhenFu HUANG JiWu | 2007 | Science in China(Series F)2007，50，3： | 39 |
| 18 | Attribute reduction theory of concept lattice based on decision formal contexts显示文摘The theory of concept lattices is an efficient tool for knowledge representation and knowledge discovery, and is applied to many fields successfully. One focus of knowledge discovery is knowledge reduction. Based on the reduction theory of classical formal context, this paper proposes the definition of decision formal context and its reduction theory, which extends the reduction theory of concept lattices. In this paper, strong consistence and weak consistence of decision formal context are defined respectively. For strongly consistent decision formal context, the judgment theorems of consistent sets are examined, and approaches to reduction are given. For weakly consistent decision formal context, implication mapping is defined, and its reduction is studied. Finally, the relation between reducts of weakly consistent decision formal context and reducts of implication mapping is discussed. | WEI Ling QI JianJun ZHANG WenXiu | 2008 | Science in China(Series F)2008，51，7： | 35 |
| 19 | Lane of parallel through carry in ternary optical adder显示文摘At the present 50 to 100 microseconds are necessary for a liquid crystal to change its state from opacity to clarity; 1.14× 10-5 microseconds are however proved to be enough for light to pass through a clarity liquid crystal device. Rooted from this great difference in time, an optical adder was constructed with parallel through carry lanes (PTCL) composed of liquid crystals. Because all carries in PTCL process in parallel, the carry delay in the ternary optical computer's adder is avoided. Eliminating the carry delay in adder of ternary optical computer by physical means, the PTCL is also applicable for other types of optical adders. Moreover a light diagram of the adder and one PTCL structure are provided. | JINYi HEHuacan AILirong | 2005 | Science in China(Series F)2005，48，1： | 31 |
| 20 | Internet-based virtual computing environment(iVCE):Concepts and architecture显示文摘Resources over Internet have such intrinsic characteristics as growth, autonomy and diversity, which have brought many challenges to the efficient sharing and comprehensive utilization of these resources. This paper presents a novel approach for the construction of the Internet-based Virtual Computing Environment (iVCE), whose sig- nificant mechanisms are on-demand aggregation and autonomic collaboration. The iVCE is built on the open infrastructure of the Internet and provides harmonious, transparent and integrated services for end-users and applications. The concept of iVCE is presented and its architectural framework is described by introducing three core concepts, i.e., autonomic element, virtual commonwealth and virtual executor. Then the connotations, functions and related key technologies of each components of the architecture are deeply analyzed with a case study, iVCE for Memory. | LU Xicheng WANG Huaimin WANG Ji | 2006 | Science in China(Series F)2006，49，6： | 33 |
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