EEG-based asynchronous BCI control of a car in 3D virtual reality environments

Brain computer interface (BCI) aims at creating new communication channels without depending on brain’s normal output channels of peripheral nerves and muscles. However, natural and sophisticated interactions manner between brain and computer still remain challenging. In this paper, we investigate how the duration of event-related desynchronization/synchronization (ERD/ERS) caused by motor imagery (MI) can be modulated and used as an additional control parameter beyond simple binary decisions. Furthermore, using the non-time-locked properties of sustained (de)synchronization, we have developed an asynchronous BCI system for driving a car in 3D virtual reality environment (VRE) based on cumulative incremental control strategy. The extensive real time experiments confirmed that our new approach is able to drive smoothly a virtual car within challenging VRE only by the MI tasks without involving any muscular activities. Supported by the National High-Tech Research Program of China (Grant No. 2006AA01Z125) and the National Basic Research Program of China (Grant No. 2005CB724301)     

区域规划决策支持系统

本文介绍系统科学研究中心1988年研制成功的新颖集成软件——区域规划决策支持系统的设计思想。区域规划决策支持系统又称规划支持系统(PlanningSupport System,英文缩写PSS)。它采用框架式全模块化结构,可根据省、地、县、经济区和各部门的特点而生成不同的系统,进行计算机辅助规划设计工作,且便于规划的实施和调整,为区域规划的规范化、标准化和程序化创造了条件。     

Reconstruction algorithm of computerized ionospheric tomography

Applying the technique of computer tomography to ionosphere detection, Computerized Ionospheric Tomography (CIT) can produce the large scale distribution of electron density in a two dimentional longitudinal section of ionosphere. According to the actual detecting condition of sparse receiver and limited projecting angle, polynomial interpolation method and projecting angle expansion method are proposed. A new energy function is formulated according to the constraint of least neighbourhood error. Simulated annealing is incorporated in the iteration of ART to get the global minimum of energy function. Sun Xiaon; born in May 1968, Ph. D. Current research interest is in computer graphics & Image processing Supported by the National Natural Science Foundation of China     

Integrated research of parallel computing: Status and future

In the past twenty years, the research group in University of Science and Technology of China has developed an integrated research method for parallel computing, which is a combination of ＂Architecture- Algorithm-Programming-Application＂. This method is also called the ecological environment of parallel computing research. In this paper, we survey the current status of integrated research method for parallel computing and by combining the impact of multi-core systems, cloud computing and personal high performance computer, we present our outlook on the future development of parallel computing.     

教学机器人的设计与实现

介绍了华东师范大学按照国家教育部制定的“普通中学技术课程标准”设计的教学机器人模型．该机器人模型可用于中学单片机应用的教学,其主要特点为：用模块学习取代芯片学习,解决中学生缺乏计算机硬件和电路基础知识的困难;用软件仿真和程序下载相结合的方法,解决教学机器人制作必须使用单片机开发设备的问题．     

慈云桂与中国银河机研究群体的发展历程

1983年国防科技大学研制成功中国第一台巨型计算机——银河亿次机，填补了中国巨型计算机技术的空白，打破西方对中国高性能计算机技术的封锁，为中国国防和经济建设提供了必要的科学计算手段。通过对周兴铭院士的访谈，了解银河机研究群体的产生与发展历程，阐述慈云桂院士主持银河亿次机研制的决策、管理和关键技术创新，并澄清有关质疑。     

Monte carlo simulation of the coaxial electrons backscattering from thin films

By using the Monte Carlo method, we simulated the trajectories of coaxial backscattering electrons corresponding to a new type of scanning electron microscope. From the calculated results, we obtain a universal expression, which describes with good accuracy the backscattering coefficient versus film thickness under all conditions used. By measuring the coaxial backscattering coefficient and using this universal formula, the thickness of thin films can be determined if the composition is known. Foundation item: Supported by the National Natural Science Foundation of China (No. 993201015) Biography: Hu Da-ping (1957-), male, Ph. D. candidate, research direction: application of computer.     

Concurrent Engineering Systematic Approach and Application

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Analysis of network performance for computer communication systems with benchmark

This paper introduced a performance evaluating approach of computer communication system based on the simulation and measurement technology, and discussed its evaluating models. The result of our experiment showed that the outcome of practical measurement on Ether-LAN fitted in well with the theoretical analysis. The approach we presented can be used to define various kinds of artificially simulated load models conveiently, build all kinds of network application environments in a flexible way, and exert sufficiently the widely-used and high-precision features of the traditional simulation technology and the reality, reliability, adaptability features of measurement technology. Foundation item: Supported by the National 863 High-Tech Project of China (863-300-02-09-99) and by Key Research Project of Hubei Province (991P110) Biography: CAO Yang(1943-), male, Professor, Research interests are in computer network and distributed processing.     

A new chaotic function and its cryptographic usage

Wheeler pointed ouuailat the period of Matthews＇ chaotic function （MCF） is often too short to be suitable for crypto- graphic usage in the manner of computer statistics, but this statement was given only through digital computation. In this paper, we proved by theoretical and practical method that period exists in MCF and analyzed the underlying reason. With two chaotic functions working together we presented a modified MCF （MMCF） that is non-periodic. The simulation tests with reconstruction of phase space showed that our modified MCF is of no period. And we described how to implement a cryptographic usage with MMCF.     

State Key Laboratory of Mechanical Transmission

1 General introduction The State Key Laboratory of Mechanical Transmission (SLMT), located at Chongqing University,was founded upon the approval of the State Planning Commission in 1988, and began to open to scholarsat home and abroad in August 1990 and passed the approval check in 1991. Since then, a great deal offruits have been reaped in scientific researches, personnel training and academic exchange. In 1997, itpassed the evaluation organized by the National Natural Science Foundation of China entrusted by theState Planning Commission and the State Science and Technology Commission. Now, Prof. Qin Datong isthe director of the laboratory. Academicians Lei Tianjue and Zhang Qixian are the honorary chairmen andAcademician Yang Shuzi holds the chairman post of the Laboratory' s Academic Committee which consistsof 18 famous experts in the field of mechanical engineering. There are six doctoral supervisors in the Lab-oratory: Prof. Liang Xichang, Prof. Zhang Guanghui, Prof. Li Runfang, Prof. Liu Fei, Prof. Qin Da-tong and Prof. Wei Yunlong. There are 25 permanent staff members altogether, including 20 researchers(16 with senior technical title, 4 with middle technical title), 3 technicians and 2 administrators. 2 Major research areas The main research areas of the Laboratory include: (i) basic theory and application of mechanicaltransmission, including gear geometry, failure theory, manufacturing technology, establishment of newdrive systems and design estimating systems; (ii) modem transmission theory and technology, includingcombination of mechanical transmission with new technology and high technology such as micro-electron-ics, computer, automatic controlling, etc; (iii) information and controlling of machinery and transmis-sion system such as integrated system of computer aided engineering, computer integrated manufacturingsystem, fault diagnosis and state monitoring. In recent years, 13 national key projects, 9 national hightechnology development program projects, as well as 2 key projects and 37 general projects supported bythe National Natural Science Foundation of China (NSFC) have been undertaken in the Laboratory.     

全国计算机等级考试上机考试系统配置探究

全国计算机等级考试(NCRE)是由教育部考试中心主办的全国性计算机证书考试。本文探究了一套高效、安全的NCRE上机考试系统配置方法,首先介绍NCRE上机考试系统的结构,然后讨论NCRE上机考试系统的前期系统配置,并介绍上机考试过程中的注意事项。     

Boundary information extraction in industry inspection

Edge processing of binary image has been one of the most fundamental issues in the area of computer vision. It has great application in industrial inspection. This paper presents a robust ‘corner feature extraction’ algorithm which extracts corner features of binary image without any assumptions and constraints. By using this algorithm, the optimal corner features are extracted to characterize the image. After corner features are obtained, a novel approach is proposed to acquire the boundary information, which is based on the least square fitting method. We show its efficiency with some test images. Supported by the National Defence Scientific Work Committee Foundation of China (No. 96-750-01) Chai Yaping: born in 1974, Master graduate student     

Transmutation Scheme of Coin Flipping Protocol and Utilization

Coin flipping by telephone protocol（CFP） is utilized in a system to exchange a binary sequence at random between two person apart far from each other. However, CFP cannot he used in a system with many users like in a group environment system. A transmutation of CFP named T-CFP is proposed in this paper. The precondition of T-CFP is the system＇s user trusts the system center and center＇s cheating is meaningless at the same time. The significant difference between CFP and T-CFP is that CFP supports only two users while T-CFP can support many users to exchange special information. The security and efficiency of T-CFP are discussed with a detailed example on T-CFP utilization is demonstrated in this paper.     

The Configuration Strategies on Caching for Web Servers

The Web cluster has been a popular solution of network server system because of its scalability and cost effective ness. The cache configured in servers can result in increasing significantly performance, In this paper, we discuss the suitable configuration strategies for caching dynamic content by our experimental results. Considering the system itself can provide support for caching static Web page, such as computer memory cache and disk＇s own cache, we adopt a special pattern that only caches dynamic Web page in some experiments to enlarge cache space. The paper is introduced three different replacement algorithms in our cache proxy module to test the practical effects of caching dynamic pages under different conditions. The paper is chiefly analyzed the influences of generated time and accessed frequency on caching dynamic Web pages. The paper is also provided the detailed experiment results and main conclusions in the paper.     

Detection of infrared photons with a superconductor

A superconductor single photon detector based on NbN nanowire was fabricated using electron beam lithography （EBL） and reactive ion etching （RIE） for infrared photon detection. When biased well below its critical current at 4.2 K, NbN nanowire is very sensitive to the incident photons. Typical telecommunication photons with a wavelength of 1550 nm were detected by this detector. Data analysis indicates the repeating rate of the device with 200 nm NbN nanowire may be up to 100 MHz, and the quantum efficiency is about 0,01% when biased at 0.95/c.     

One method for improving RAID5 performance

As a kind of parallel storage system, RAID5 has been becoming a popular solution for providing better performance at low cost and without sacrificing much redundant data, its main disadvantage is poor performance. It is a general method to improve RAID5 performance by using cache. However, it often happens that the data is not hit in cache, in this case, the RAID5 performance also will be very poor. The method based on combination of disk I/O operations has been proposed for impriving the I/O response time through reducing the number of low-level operations. According to theoretic analysis and experimental test, we find that RAID5 access time and data transfer rate could be largely improved than conventional method. Foundation item: Supported by the National Natural Science Foundation of China under grant 69773046 and (69973017), and Defense Advanced Research Foundation of China under grant (98J15. 1. 1. JW0516) Biography, Chen Qiong (1963-), female, Ph. D candidate, research interests: computer architecture, parallel processing, disk arrays.     

Image Retrieval Based on Objects＇ Spatial Orientation Relationships

A new concept of characteristic scanning radial (CSR) is proposed for the segmented image on the basis of two shape-speciiic points oi its shape-objects. Subsequently, two characteristic attribute sequences (CAS) of relative distance and relative direction are derived to represent the spatial orientation relationships among objects of the image. A novel image retrieval algorithm is presented using these two CASs. The proposed retrieval approach not only satisfies the transformational invariance, but also attains the quantitative comparison of matching. Experiments identify the effectiveness and efficiency of the algorithm adequately.     

A fair off-line e-cash system with group signature

This paper describes the research results and development of fair off-line e~eash systems so far, and points out that in these systems, the bank can compute the doublespender‘s account secret key, thus the bank can impersonate the double-spender to withdraw from the double-spender‘s account. This article utilizes anonymity control and group signature to address this shortcoming.     

Arctic dipole anomaly and summer rainfall in Northeast China

A dipole structure anomaly in summer Arctic atmospheric variability is identified in this study, which is characterized by the second mode of empirical orthogonal function （EOF） analysis of summer monthly mean sea level pressure （SLP） north of 70°N, accounting for 12.94% of the variance. The dipole anomaly shows a quasi-barotropic structure with opposite anomalous centers over the Canadian Arctic and the Beaufort Sea and between the Kara Sea and the Laptev Sea. The dipole anomaly reflects alternating variations in location of the polar vortex between the western and eastern Arctic regions. The positive phase of the dipole anomaly corresponds to the center of the polar vortex over the western Arctic, leading to an increase in summer mean rainfall in Northeast China. The dipole anomaly has a predominant 6-year periodicity, and shows interdecadal variations in recent decades.