完全图K97的边染色与4个Ramsey数的新下界

用构造性方法研究完全图K97的边的各种染色,得到4个经典Ramsey数的新下界：R（3,3,8）≥98,R（3,4,6）≥98,R（3,5,5）≥98,R（3,18）≥98。     

精彩赛事 激情共享 三星笔记本电脑五一促销火热开启

“世界杯”开战在即,为回馈所有关注三星笔记本电脑并给予大力支持的消费者,三星笔记本电脑火热开启“精彩赛事激情共享”五一促销活动。本次促销活动将从2010年4月24日延续到2010年5月9日,期间凡购买i3、i5系列机型R480（R478）、RA40（R439）、R780、R728、R580、R530（R528）、R429以及AMD机型R423、R523的消费者都将有机会获得三星笔记本电脑精心准备的节日大礼包。     

粗糙集代数与蕴涵格

在粗糙集的代数刻画方面,一个重要方法是在偶序对〈R（X）,R（X）〉构成的集合中通过定义基本运算寻找刻画偶序对所成集合的代数结构。其中,最有影响的代数结构是正则双Stone代数和Nelson代数。本文从偶序对〈T（X）,R（X）〉构成的集合入手,通过定义蕴涵运算证明了偶序对〈R（X）,R（X）〉所成集合构成蕴涵格,讨论了粗蕴涵格与
正则双Stone代数的关系。本文的讨论可为粗糙逻辑和粗糙推理奠定基础。     

QLogic与NVIDIA携手将高性能计算的能效推至新高

QLogic公司于近日宣布，国家超级计算机应用中心（NCSA）的集群采用NVIDIA Tesla图形处理单元（GPUs）以及QLogic（R）InfiniBand（R）交换机和适配器，其能效指数在全球超级计算机的排名Green500中位列第三。     

高光效大豆光合速率与主要光合生理指标及农艺性状的关系

为明确不同大豆品种叶片在3个关键的生殖生长时期4个主要光合生理指标对光合速率（Pn）的影响;明确高光效大豆品种的Ph高于低光效大豆品种的诸多影响因素;明确大豆叶片的Pn与几个农艺性状之间的密切关系。选用4个光合速率不同的大豆品种（两个高光效品种：黑农40、黑农41;一个中光效品种：黑农37;一个低光效品种：黑农26）于大豆的始荚期（R3）、始粒期（R5）、鼓粒期（R6）测定上述4个品种的光合速率（Pn）、气孔导度（Cond）、胞间CO2浓度（Ci）、蒸腾速率（Tr）,并且通过Pn、Tr的观察值推算出水分利用率（WUE=Pn／Tr）。通过多元相关分析,研究了Cond等光合生理指标对Pn的影响,以及光合速率与农艺性状的相关性。结果表明：不同光合能力的大豆品种叶片的Pn在R3、R5、R6期分别与Cond、Tr呈极显著正相关;与Ci在3个生育时期大多呈微弱负相关;与WUE在R5期呈极显著正相关,在R3、R6期大多呈微弱正相关。但是,高光效品种在耽与Cond、Ci、Tr及WUE的相关性方面比低光效品种密切。R5期大豆叶片的Pn与收获指数呈正相关,但不同光合水平大豆品种的Pn与单株重、单株粒重的相关性存在差异。     

Luminary Micro推出Stellaris（R）智能3.5英寸Landscape Display Module和参考设计工具包——新模块为原始设备制造商带来在几乎任何工业系统中添加紧凑型自定义用户界面的捷径

德克萨斯州奥斯汀2008年11月5日电／新华美通／-基于ARM（R1Cortex（TM）．M3的获奖的Stellaris（R）系列微控制器（MCU）开发商Luminary Micro今天宣布推出新的Stellaris智能（Intelligent）3．5英寸Landscape Display Module（MDL-IDM-L35）和Reference Design Kit（RDK-IDM-L35）（参考设计工具包）。     

玉米叶面积指数与高光谱植被指数关系研究

探讨以不同的植被指数建立的高光谱模型对玉米叶面积指数LAI的反演精度。实测不同水肥耦合作用下，玉米冠层的高光谱反射率与叶面积指数（Leaf Area Index）数据，采用高光谱红光波段（631~760 nm）与近红外波段（760~1 074 nm）逐波段构建NDVI、RVI、DVI、TSAVI、PVI植被指数，分别找出与LAI具有最佳相关性波段组合的植被指数，建立玉米LAI估算模型。结果显示，与LAI具有佳相关性的波段组合分别是NDVI（R760，R990）、RVI（R760，R1001）、DVI（R677，R1070）、TSAVI（R 760，R 975）、PVI（R658，R966），它们反演玉米LAI的确定性系数分别：R²>0.72、R²>0.74、R²＝0.95、R²>0.79、R²>0.95。结果表明，在玉米的整个生长季的47个样本中，通过PVI和DVI方式建立的遥感估算模型能够较为准确地估算玉米LAI，TSAVI次之，NDVI、RVI稍差。     

ZigBee与Wi—Fi联盟合作发展智能电网无线网络

加州SANRAMON和得克萨斯州奥斯汀3月17日电／美通社亚洲／--ZigBee（R）联盟（ZigBee（R）Alliance）和Wi—Fi联盟（Wi—Fi Alliance（R））今天宣布双方达成一项协议,旨在针对智能电网应用的无线家庭局域网络（HAN）展开合作。合作最初将主要集中在ZigBee Smart Energy 2．0,这是一个基于当今成功的ZigBee Smart Energy Profile面向智能电网家庭的新一代能源管理协议。通过此次合作,ZigBee Smart Energy 2．0预计也将应用于Wi—Fi技术领域。     

中国高校R＆D投入对产出和区域经济增长的影响研究：基于2005年-201O年省际面板数据

通过我国31个省市6年的面板数据进行分析,考察了高校R＆D投入与产出的关系,以及高校R＆D投入对区域经济增长的影响。研究结果表明,（1）高校R＆D的经费投入与区域经济之间存在正相关的关系,高校R＆D投入的全时人员与区域经济关系不显著。（2）科研成果无法及时转化成技术产品,促进区域经济的增长。（3）各地区的高校之间缺少交流,在高校R＆D产出方面存在很大的差异。     

实用电路一款：分立式机器人控制电路

这种简单的机器人具有光敏反应动作，可以避开障碍物。它不采用微控制器、编程器或PC。在电路中只有一个特殊的器件就是窗口鉴别器（新型的窗口比较器）。 电路如图1所示。由电阻R1和R2与光敏电阻LDR1和LDR2构成一分压器（在光照条件下用R1和R2限制电流）。窗口鉴别器TCA965将中点电压和上阈值（用P1调节）及下阈值（用P2调节）进行比较。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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