论IPv6技术的研究现状

IPv6技术是随着互联网发展而迅速崛起的技术.本文描述了IPv6技术出现的原因,分析比较了IPv4技术与IPv6技术,指出了IPv4技术的不足之处及IPv6技术的特点,介绍了IPv6技术研究的现状,说明了IPv6技术的典型应用,最后,对IPv6技术未来发展前景进行了展望.     

Internet Push技术的分析与展望

Internet Push技术是第三代浏览器的核心技术,是近年出现的减少Internet上信息过载和高效获取信息资源的新技术,时下最热门的电子商务、网上营销等都应用了Push技术,在介绍Push技术产生背景,要领的基础上,分析了Push技术的实现方式,阐述了Push技术发展的技术基础,如频道技术、IP多播技术等,在分析了Push技术陷入困境的原因后,讨论了Push技术的发展趋势。     

浅谈蓝牙技术的发展现状和前景

蓝牙技术是通信技术的革命性变革。本文首先概括地介绍了蓝牙技术的概念及特点,在此基础上,阐述了蓝牙技术的系统构成,然后,分析了蓝牙技术的主要应用,提出了蓝牙技术的发展现状,最后,对蓝牙技术的发展前景进行了展望。     

数据集成技术综述

从现行信息需求出发,介绍了数据集成技术发展的必要性,讨论了已有的数据集成技术,分析了这些技术的优缺点,介绍了网格技术、本体技术两个新的异构数据集成技术。在此基础上给出了本体技术和中间件相结合数据集成解决方案。最后,提出了数据集成方法的发展方向。     

论社区网格化管理平台的可靠性分析与设计

描述了平台概况,介绍了常用的冗余方法、软件容错技术、双机容错技术和集群技术等容错技术,并结合我区社区管理信息化创新平台建设,阐述了该平台采取的接入层虚拟化双机冗余、软件容错技术、数据库服务器双机容错技术与服务器虚拟化集群技术等多项容错技术.通过采用这些技术显著提高了该信息系统的可靠性,确保了社区管理与综合服务的质量.     

基于MFC框架的ADO访问技术

VC++为应用程序提供了多种数据库访问技术,如ODBC技术、OLE DB技术、MFC ODBC技术、DAO技术以及ADO技术。简单描述了相关技术的内涵,通过用户登录功能的实现详细阐述了ADO数据库访问技术。     

论P2P技术的研究现状

P2P技术是随着互联网发展而迅速崛起的技术.该文描述了P2P技术出现的原因,分析比较了P2P技术与C/S技术,介绍了P2P技术的特点、P2P技术研究的现状,说明了P2P技术的典型应用,客观的交待了P2P技术存在的问题,最后,对P2P未来发展前景进行了展望.     

计算机图像处理技术的探析

计算机图像技术的发展及应用,在诸多方面推动了现代社会的发展。该文概述了计算机图像处理技术,并在此基础上论述了计算机图像处理技术的要点及研究方向,阐述了新时期计算机图像处理技术的发展趋势。最后,基于计算机图像技术的发展,论述了计算机图像处理技术的应用。该文通过对计算机图像处理技术的全面论述,以强化对其认识,推动计算机图像处理技术的相关研究。     

分层技术在计算机软件开发中的应用效果分析

作者对分层技术在软件开发工作中的效果进行了分析,重点探讨了分层软件设计技术的概念、现有的分层技术,以及伴随分层技术而诞生的中间件技术,最后作者总结了分层软件设计技术的巨大价值.     

对典型分布式计算技术的分析和比较

本文对分布式计算技术的工作原理和几种典型的分布式计算技术,如中间件技术、网格技术、移动Agent技术、P2P技术以及最近推出的WebService技术进行了分析和比较,介绍了存储整合在分布式计算技术中的应用,指出了其存在的一些问题。     

INTRODUCTION TO THE SPECIAL ISSUE ON CASE-BASED REASONING IN THE HEALTH SCIENCES

There has been an explosion of interest in health sciences applications of case-based reasoning (CBR), not only in the traditional CBR in medicine domain, but also in bioinformatics, enabling home health-care technologies, CBR integration, and synergies between CBR and knowledge discovery. This special issue features the best papers from the third workshop on CBR in the health sciences, held at ICCBR-05 in Madrid. It is the third in a series of exciting workshops, the first two of which were held at ICCBR-03, in Trondheim, Norway, and at ECCBR-04, in Madrid, Spain. The nine high-quality papers introduced here represent the research and experience of twenty-two authors working in eight different countries on a wide range of problems and projects. These papers illustrate some of the major trends of current research in CBR in the health sciences, and represent overall an excellent sample of the most recent advances of CBR in the health sciences.     

利用MODIS EVI时间序列数据分析福建省植被变化(2000~2017年)

以全国森林覆盖率最高的福建省为研究对象,利用2000~2017年夏季的MODIS EVI植被指数数据和气象与非气象因子进行协同分析,以揭示近17年福建植被的时空变化及其影响因子。结果表明:研究期内福建的EVI均值整体上升,从2000年的0.454上升至2017年的0.505,17 a间上升了11.2%,表明福建省的植被整体处于变好的状态,且在中部和西南部的变化最明显。相关分析表明,在研究期内,气象因子(气温和降水)对EVI变化的影响不显著,植被的变好主要为非气象因子的作用。EVI的提高主要得益于2003年福建省建设生态省后森林覆盖率的提高,并和2012年开始的水土流失治理有明显关系,这说明人类活动的积极作用对福建植被的变好起到了关键的作用。     

涌现视角下的网络空间安全挑战

网络空间的安全性属于涌现属性,该属性给网络空间安全带来了严峻的挑战.国内外已有不少研究者关注网络空间安全的涌现现象,迄今已取得不少成果.然而,人们对网络空间安全涌现性的认识还非常不足.针对这一状况,从涌现性的视角对网络空间安全挑战进行全面考察,旨在促进网络空间安全新思想、新理论的发展.首先,从系统科学中的涌现性的本意出发,揭示网络空间安全涌现性的基本思想;其次,从攻击、漏洞和防御3个角度,考察网络空间中存在的涌现式安全挑战;然后,按描述性、指导性和操作性3种类型,分析网络空间安全涌现性研究的发展状况;最后,从基础理论、基本模型和实用工具3个方面,讨论开展未来工作的基本途径.     

网页制作与电子商务网站安全

网页制作是目前比较流行的一种行业,它已经渗透到社会的各个角落,而电子商务网站中网页制作技术应用的最多,该文主要从电子商务网站的安全隐患、网站安全现状、网站安全的措施与解决方案、电子商务发展等方面进行探讨,尤其对于网站安全的考虑,在编写网页代码时,应注意的一些防范方法的介绍,以促进人们对网页制作中的安全防范技术的了解。     

Analysis of finite-buffer discrete-time batch-service queue with batch-size-dependent service

Over the last two decades there has been considerable growth in digital communication systems which operate on a slotted system. In several applications, transmission of packets over the network takes place in batches of varying size, and transmission time depends upon the size of the batch. Performance modelling of these systems is usually done using discrete-time queues. In view of this, we consider a single-server queue with finite-buffer in a discrete-time domain where the packets are transmitted in batches (of varying size) according to minimum and maximum threshold limit, usually known as general batch service rule. The transmission time (in number of slots) of these batches depends on the number of packets within the batch under transmission, and is arbitrarily distributed. We obtain, in steady-state, distribution of the number of packets waiting in the queue and in service (those being transmitted in batches). In addition, we also obtain average number of packets waiting in queue, in the system, with the server, rejection probabilities, etc. Finally, computational experiences with a variety of numerical results have been discussed by introducing a cost model which gives optimum value of the lower threshold limit.     

Stability of nonlinear hybrid dynamical systems with time delay via sum of squares decomposition

Considering an infinite number of eigenvalues for time delay systems, it is difficult to determine their stability. We have developed a new approach for the stability test of time delay nonlinear hybrid systems. Construction of Lyapunov functions for hybrid systems is generally a difficult task, but once these functions are found, stability’s analysis of the system is straight-forward. In this paper both delay-independent and delay-dependent stability tests are proposed, based on the construction of appropriate Lyapunov-Krasovskii functionals. The methodology is based on the sum of squares decomposition of multivariate polynomials and the algorithmic construction is achieved through the use of semidefinite programming. The reduction techniques provide numerical solution of large-scale instances; otherwise they will be computationally infeasible to solve. The introduced method can be used for hybrid systems with linear or nonlinear vector fields. Finally simulation results show the correctness and validity of the designed method. Recommended by Editorial Board member Young Soo Suh under the direction of Editor Jae Weon Choi. The authors wish to express their thanks to Dr. A. Papachristodoulou and Dr. M. Peet for their helpful comments and suggestions. Mohammad Ali Badamchizadeh was born in Tabriz, Iran, in December 1975. He received the B.S. degree in Electrical Engineering from University of Tabriz in 1998 and the M.Sc. degree in Control Engineering from University of Tabriz in 2001. He received the Ph.D. degree in Control Engineering from University of Tabriz in 2007. He is now an Assistant Professor in the Faculty of Electrical and Computer Engineering at University of Tabriz. His research interests include Hybrid dynamical systems, Stability of systems, Time delay systems, Robot path planning. Sohrab Khanmohammadi received the B.S. degree in Industrial Engineering from Sharif University, Iran in 1977 and the M.Sc. degree in Automatic from University Paul Sabatie, France in 1980 and the Ph.D. degree in Automatic from National University, ENSAE, France in 1983. He is now a Professor of Electrical Engineering at University of Tabriz. His research interests are Fuzzy control, Artificial Intelligence applications in control and simulation on industrial systems and human behavior. Gasem Alizadeh was born in Tabriz, Iran in 1967. He received the B.S. degree in Electrical Engineering from Sharif University, Iran in 1990 and the M.Sc. degree from Khajeh Nasir Toosi University, Iran in 1993 and the Ph.D. degree in Electrical Engineering from Tarbiat Modarres University, Iran in 1998. From 1998, he is a Member of University of Tabriz in Iran. His research interests are robust and optimal control, guidance, navigation and adaptive control. Ali Aghagolzadeh was born in Babol, Iran. He received the B.S. degree in Electrical Engineering in 1985 from University of Tabriz, Tabriz, Iran, and the M.Sc. degree in Electrical Engineering in 1988 from the Illinois Institute of Technology, Chicago, IL. He also attended the School of Electrical Engineering at Purdue University in August 1998 where he was also employed as a part-time research assistant and received the Ph.D. degree in 1991. He is currently an Associate Professor of Electrical Engineering at University of Tabriz, Tabriz, Iran. His research interests include digital signal and image processing, image coding and communication, computer vision, and image analysis.     

在结构与随机扰动下的大系统的稳定性

在本文中,我们给出了在结构与随机扰动下的动态大系统的稳定性分析,建立了这类大系统的依概率吸引性,依概率一致有界性,依概率大范围渐近稳定性,p吸引性,一致p有界性,和大范围渐近p稳定性的结论。这些结论的假设是由孤立子系统和与其联系的李亚普诺夫函数,受扰系统的结构和作用在子系统上的随机扰动表出的。     

Analysis of Vegetation Changes in Fujian Province Using MODIS EVI Time Series Data (2000~2017)

Fujian province has the highest forest coverage rate in China for decades, which has played an important role in maintaining a good ecosystem quality in southeastern China. This study conducted an investigate aiming to find out the spatial and temporal changes of the vegetation status in Fujian and the impact factor involving in the vegetation growth during the period from 2000 to 2017, using the summer data of MODIS Enhanced Vegetation Index (EVI) product, associated with meteorological and non-meteorological data. The results showed that the mean EVI of Fujian rose as a whole during the 17 study years, from 0.454 in 2000 to 0.505 in 2017, increased by 11.2% in the period. This indicates that the overall vegetation status in Fujian has been improved, especially in, south and west parts of the province, while eastern coastal areas have shown decrease in vegetation coverage. Correlation analysis showed that during the study period, meteorological factors (temperature and precipitation) had no significant impact on the provincial EVI change, and the improvement of the vegetation status mainly due to non-meteorological factors. Both the construction of the ecological province in Fujian starting in 2003 and the soil erosion treatment starting in 2012 have strong relationships with vegetation increase. The increase of forest coverage rate and the decrease of soil erosion area have contributed significantly to the enhancement of Fujian’s EVI in the past 17 years.     

产品质量设计在ERP系统中的开发应用

ERP系统在济钢的成功运行,使其无论在日常运营、资源配置上,还是生产的管理、采购、销售中,发挥着越来越重要的作用。面向客户、面向订单的全过程的产品质量设计,及其在生产过程中的跟踪,提高客户满意度,实现精准、高效、和谐的生产模式上起着决定性作用。