An industrial application of symbolic model checking     

Florian Kammüller  S?ren Preibusch 《Informatik - Forschung und Entwicklung》2008,22(2):95-108

Model checking techniques are recognized to provide reliable and copious results. Instead of examining a few cases only – as it is done in testing – model checking includes the whole state space in mathematical proofs of correctness. Yet, this completeness is seen as a drawback as the state explosion problem is hard to handle. In our industrial case study, we apply automated model checking techniques to an innovative elevator system, the TWIN by ThyssenKrupp. By means of abstraction and nondeterminism, we cope with runtime behaviour and achieve to efficiently prove our specification’s validity. The elevator’s safety requirements are exhaustively expressed in temporal logic along with real-world and algorithmic prerequisites, consistency properties, and fairness constraints. Beyond verifying system safety for an actual installation, our case study demonstrates the rewarding applicability of model checking at an industrial scale. CR subject classification  D.2.4; F.3.1; J.7 ; C.3  相似文献   

The perceived needs of support of parents and classroom teachers a comparison of needs in two microsystems     

Mats Granlund  Lise Roll-Pettersson 《欧洲特需教育杂志》2013,28(3):225-244

The aim of this study was to describe and compare from a systems perspective the perceived needs of parents and teachers of school-age children with intellectual impairments. The relationship between type and degree of impairment to perceived needs was analysed. Comparisons revealed that while the parents and teachers differed regarding their respective needs, they agreed on specific informational needs. It was found that certain child characteristics in interaction with contextual factors evoked specific needs within microsystem settings. Motor impairments tended to correlate with needs regarding family routines, and impairments in communication and behaviour tended to correlate with family informational needs. Teachers expressed significantly more and stronger needs than parents, and teachers who instructed according to a reading based curriculum expressed more and stronger needs than teachers who instructed according to a life-skills based curriculum. These findings are discussed, together with their implications for future research and changes in teacher education.  相似文献   

论图书馆的科学管理原则   总被引：15，自引：0，他引：15  

杨玉麟 《中国图书馆学报》2004,30(2)

图书馆科学管理的原则主要有系统原则、人本原则和效益原则。实行系统原则,应掌握其整体性、层次性、动态性及开发性特征;实行人本原则,包括在图书馆内部和外部两方面坚持人本思想的管理;实行效益原则,则要注意社会效益,争取经济效益。参考文献3。  相似文献   

数据仓库在决策支持系统中的应用     

钱新勰 《南宁职业技术学院学报》2007,12(1):115-117

通过分析传统决策支持系统所面临的问题,对数据仓库及联机分析处理技术等加以论述,并着重说明了数据仓库及OLAP、数据挖掘技术在更高一级的决策支持系统中的应用前景。  相似文献   

Anfragebasierte Client-Indexierung in Client-Server-Informationssystemen     

Hagen H?pfner 《Informatik - Forschung und Entwicklung》2006,20(4):209-221

Zusammenfassung Eine zentrale Fragestellung in Client-Server-Informationssystemen ist die serverseitige Zuordnung von Clients zu den durch diese benutzten Daten. Insbesondere in Szenarien, welche das clientseitige Cachen von Daten beinhalten, k?nnen derartige Informationen genutzt werden, um den globalen Datenbestand konsistent zu halten. Bei ?nderungen der Daten auf dem Server kann auf diese Weise serverseitig festgestellt werden, welche Caches durch die Modifikation ungültig geworden sind. In einem darauf folgenden Schritt k?nnen dann diese Caches je nach eingesetzter Strategie invalidiert oder korrigiert werden. In dem vorliegenden Beitrag werden Verfahren diskutiert, welche Datenbankanfragen nutzen, um die serverseitige Zuordnung von Clients zu den von ihnen benutzten Daten vornehmen zu k?nnen.

---

One issue in client/server information systems is the storage of the relationships between clients and data used by these clients. In particular in scenarios, that allow the caching of data on the client site, this information can be used in order to keep the “global database” consistent. Thus, if the data on the server become updated, it is possible to detect caches affected by the update. In a following step it is possible either to patch or to invalidate these caches. In this paper we discuss approaches that use posted queries in order to index the clients on the server site.

  相似文献   

Is it just too good to be true? Unearthing the benefits of disruptive technology     

《International Journal of Information Management》2020

The rate of digital disruption is escalating and placing increasing pressure on organisations to adopt emerging technologies in order to improve their productivity and bottom-lines. Unfortunately, however, many organisations are often being seduced by the purported benefits of disruptive technologies often based on embellished or even falsified claims. This is particularly true in construction, where organisations are being required to embrace disruptive technologies (e.g. Building Information Modelling and Industry 4.0) to address performance and productivity issues. Unsubstantiated claims about expected benefits subvert the justification and benefits realisation process as the change management that is required is downplayed or ignored. It is, therefore, imperative that the business case as part of the process of evaluation, is based on evidence to enable the development of a change management and implementation strategy. In this paper, we present an overview of a longitudinal line of inquiry that sought to examine the benefits of disruptive technology, namely Systems Information Modelling (SIM). Our research revealed that more than a 90 % cost reduction to document electrical systems and a corresponding improvement in productivity was achieved. We suggest that engaging in the process of critical thinking, possessing a conscious awareness and healthy scepticism of technology places organisations in a position of control. As a consequence, organisations are better-positioned to understand the nature of technology and ‘how’ value can be generated from potential new ways of working.  相似文献   

电子资源管理系统的发展及未来思考     

陈大庆 《大学图书馆学报》2014,(3):74-79

从四个阶段分析国外电子资源管理系统的发展历程:起步阶段,大学图书馆自主研发ERMS;标准研究阶段以ERMI项目为标志,建立电子资源管理标准的雏形;繁荣发展阶段,商业性ERMS占市场主导地位,开源ERMS开始兴起,图书馆积极实施ERMS,标准不断完善;下一代新系统发展阶段,新系统的出现带来新机遇,电子资源管理标准体系基本形成。同时分析ERMS在我国的发展情况,并指出未来ERMS将与图书馆集成系统融合,合作建设知识库成为ERMS的一种新选择。  相似文献   

离散时间的混合时滞耦合神经网络的鲁棒指数同步     

钱学明 《温州大学学报(社会科学版)》2014,(3):1-11

讨论了一类离散时间的时滞耦合神经网络的同步问题.在参教不确定的离散时间耦合神经网络中,考虑了变时滞和有限分布时滞.同时,细胞激活函数假设为较Lipschitz奈件更为一般的扇形非线性函数,该函数可以既不可微又不严格单调.通过构造Lyapunov-Krasovskii泛函,运用线性矩阵不等式(LMI)技术,并结合Kronecker积来获得耦合神经网络鲁棒全局指数同步的充分性判据,并且所获得的判据依赖于时滞.最后,对一个实例进行仿真,说明结论的有效性.  相似文献   

In-formation on the prairie: Signs, patterns, systems and prairie dogs     

Paul Beynon-Davies^{Author Vitae} 《International Journal of Information Management》2011,31(4):307-316

The concept of information is clearly foundational to the ‘information’ disciplines but lacking in a clear conceptual foundation. In this paper we propose that the concept is clearly overloaded and suggest that a new vocabulary is needed to enhance our powers of understanding and explanation. We argue that information is better situated at the intersection of signs, patterns and systems, which involves the enactment of forma (the substance of a sign), informa (the content of a sign) and performa (the use of signs in coordinated action). Within this perspective ‘information’ is considered an accomplishment not only of humans but also of animals. This leads us to use a well-documented case from the animal kingdom, that of communication amongst Gunnison prairie dogs, to both ground and expand upon significant elements from our conceptual framework. This we believe helps shed new light on what the juxtaposition of information with behaviour actually means.  相似文献   

高校党务信息管理系统的设计与实现     

王瑞娟  彭可 《人天科学研究》2011,10(1):95-96

对党务信息管理系统进行需求分析,提出了系统开发的三层体系结构,并对该系统的功能模块进行详细设计。高校党务工作要引进先进的信息化科学技术和现代化管理方法,开发党务信息管理系统至关重要。  相似文献