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1.
企业实施的各种信息系统(IS)应用组成企业IS应用组合系统,各子系统相互配合产生 协同效应,使得系统总体功能得到加强.协同效应分析对企业IS应用水平的正确评价具有重 要作用.本文首先给出企业IS应用水平的评价框架,其次阐述确定协同效应的方法.该方法 首先通过IS应用的功能原理分析绘制各种IS应用之间的数据流表,然后根据数据流表得出协 同效应系数矩阵,并对其特性进行讨论.  相似文献   

2.
本文提出了一种并行的遗传算法(称为IS-GA)并应用于氩原子簇的结构优化,该算法结合了智能搜索(IS)策略,并应用扩展分布式并行模型(EDGA)将该遗传算法并行化。对原子数为N=2…30的氩原子簇(Ar)N的优化结果表明,IS-GA具有较强的优化能力和效率,该算法能得到原子个数N<27的氩原子簇的最优结构,对于原子个数大于27小于30的氩原子簇可得到其近似最优结构。  相似文献   

3.
叶春晓  余一丰 《计算机应用》2012,32(12):3426-3429
针对使用控制模型(Usage Control, UCON)中加入委托功能后安全分析愈加复杂的问题,本文首先形式化地表达了其子模型—使用前授权(UCONpreA)的委托过程,通过分析证明了一般带有委托功能的UCONpreA模型的安全性是不可确定的,然后通过构造有限状态机的方法证明了一个受约束的带有委托功能的UCONpreA模型的安全性是可确定的,最后利用该约束模型成功地表达了传统的基于角色的委托模型(RBDM0)。本研究进一步增强了UCON的表达能力,并有效保证其安全性。  相似文献   

4.
GIS与云计算的结合为GIS的数据存储、管理、处理及其应用提供了一个新的发展前景。分别给出了云计算和云GIS的定义,提出了云GIS的四种应用模式和一个多层次架构模型,重点研究了云GIS的关键技术:虚拟化技术、分布式数据存储技术(GFS)、虚拟化数据管理技术(Bigtable)、并行空间分析技术、数据和功能互操作技术和部署模式,最后给出了一个云GIS实际应用框架。  相似文献   

5.
一类非线性互联系统的模型参考跟踪模糊H∞控制   总被引:1,自引:0,他引:1  
对一类不确定非线性互联系统,给出了一种模型参考跟踪分散模糊H∞控制方法.采用模糊不确定T-S模型对非线性不确定互联系统进行模糊建模,应用并行分布补偿算法(PDC)给出了模型参考跟踪分散模糊H∞控制的设计及算法.应用李亚普诺夫方法证明了模糊闭环分散系统的稳定性分析.仿真结果进一步验证了该方法的有效性.  相似文献   

6.
该文介绍了最小模型误差估计算法(MME)和在非线性不确定系统辨识中的应用,以及分析了基于此算法的系统的鲁棒性的几个方面。并且,基于最优化理论控制以及两点边值问题,采用不变式嵌入法,给出了模型不确定非线性系统中基于MME在线递推估计算法,并首次提出了在满足协方差约束的前提下,如何最优地选择正定矩阵W的初值,以使非线性不确定系统的辨识结果达到最佳。最后,基于此算法,给出了非线性离散系统的仿真实例,仿真结果说明,最优地选择W的初值,使该方法是模型不确定非线性系统中辨识的有效方法。  相似文献   

7.
制造执行系统的研究现状和发展趋势   总被引:23,自引:0,他引:23  
制造执行系统(Manufacturing Execution Systems,MES)是制造(生产)过程的计算机在线管理系统,处于制造企业计划层与控制层之间的执行层,是企业资源计划系统和设备控制系统之间的桥梁和纽带,是制造企业实现敏捷化和全局优化的关键系统。综述了制造执行系统MES的产生与发展过程,以及MES的功能模型,给出了协同的MES功能模型和实现综合生产指标优化的流程工业MES功能模型,分析了MES的应用现状,提出了MES的发展趋势和实现管理扁平化和综合生产指标优化的流程工业MF5所需要的关键技术。  相似文献   

8.
四、系统设计指南1.总体设计总体设计是IS的宏观设计,应该设计出总的E-R图、总的功能层次图、总的功能实体图和总的功能布局图,同时应该修改与完善数据字典。E-R图是总体设计的重点与难点,是IS数据关系的总纲,是基本表设计的依据,是总体设计的主要文件。2.数据库设计数据库设计是IS设计的核心,是匕成败的关键。数据库设计的内容包括数据字典设计、E-R图设计、基本表与代码设计、主键与外键设计,中间表设计。在设计中应遵守以下原则:(1)数据字典中的元素,是IS的元数据。它由基本表和代码表的表名与字段名所组成。(2)…  相似文献   

9.
基于软件重用的报表构件生成系统的研究与实现   总被引:13,自引:0,他引:13  
针对IS(信息系统)中报表的处理过于烦琐,本文在基于软件重用的基础上,对各类报表进行分析,提出了一个报表构件模型,使得用重用的构件组装报表成为可能,并且根据此思想,建立了报表模板库,开发出报表构件生成系统,实现了报表的构件化管理和重用,并应用于实际的IS开发中。  相似文献   

10.
设计分布式中间系统-中间系统(IS—IS)路由性能监测系统,采用被动监测的方案,分析IS—IS路由协议交互过程中的数据包,利用路由变更和路由拓扑整合算法真实动态地呈现网络拓扑及路由变化,在实验网中进行测试以验证该系统的功能和性能,其监测结果可为网络的运行和维护提供重要依据。  相似文献   

11.
The strategic potential of information systems (IS) is widely recognised. However, there is a need to understand better the process leading to strategic IS applications and the way in which it may be affected by the context. This paper presents four case studies of the decision making, design and development, and implementation processes leading to strategic, intra-organizational systems. These cases are used to develop a set of general and contingency propositions about the strategic IS development process. The general propositions represent a longitudinal model of the role of senior management during various phases of the process, while the contingency propositions relate the nature of the process to four contextual factors, namely the organization's size, environmental uncertainty, the sector to which the organization belongs, and the maturity of its IS function. These propositions should serve as a basis for future empirical research on strategic IS development.  相似文献   

12.
Outsourcing is important in highly diversified business environments, but while there have been many studies on outsourcing, none have explicitly tackled the problem of how SMEs should assess and select their outsourcer. Numerous benefits might be gained if SMEs could utilize evaluation models to help select their IT/IS outsourcer effectively. Prejudices arising from selection through impartial analysis could be avoided and a more accurate and an objective decision could be made. We investigated the selection process of an enterprise needing an IT/IS outsourcing provider in Taiwan. Our recommended process quantitatively sorts the criteria using the AHP. An evaluation model was developed based on the needs of the SME who should use it to obtain a better outsourcing provider resulting from improved information vital to maintain outsourcing efficiency. Use of our model should reduce costs and potential risks in adopting new IT/IS applications and promote an objective standard with which to evaluate IT/IS outsourcing providers.  相似文献   

13.
14.
The discontinuance of the use of hedonic information systems (IS) has become somewhat prevalent. Nevertheless, little is known about why some individuals might decide to discontinue using a technology which they often use frequently and the use of which is typically intrinsically rewarding. Prior research has alluded to the ideas that (1) IS discontinuance merits its own theorizing, possibly separate from continuance and that (2) guilt feelings is a unique driver of IS discontinuance decisions. However, the literature still lacks cohesive models that explain discontinuance and especially the complex processes through which guilt influences such decisions, and perhaps that further illuminate differences between the processes underlying IS discontinuance and continuance. This study bridges these gaps and proposes and examines a model that explicates the complex effects of guilt and theory of planned behavior (TPB) predictors on the discontinuance of an instance of mostly hedonic IS, namely Social Networking Sites (SNS). In order to develop this model it is proposed that guilt, which is a self-reflective moral emotion that can influence cognition, is associated with attitudinal, normative, and control perceptions regarding the discontinuance act in a complex network of partial-mediation and moderation effects. The proposed model was tested and largely validated with structural equation modeling applied to data collected from 487 SNS users. It also pointed to possible unique features of the TPB as applied to IS discontinuance. Applicability checks further illuminated sources of guilt in this context. Decomposing the guilt effects on discontinuance and integrating them with the TPB is important since it not only extends theory both in IS and social sciences and hints at differences in planned behavior processes between IS continuance and discontinuance, but also because the findings point to mechanisms which can be used for attenuating guilt and planned behavior effects on IS discontinuance. Overall, this study validates a rationale-based theory of IS discontinuance, and can serve as a platform for further studying this notable, yet under-examined corrective behavior.  相似文献   

15.
Carr  D. Kizior  R.J. 《Software, IEEE》2000,17(2):33-36
Many educators are reexamining their curricula's content and scope to more successfully market graduates from their information systems programs. Meanwhile, business and industry IS managers have similar concerns about the continued need to maintain the large inventory of legacy code while also developing new systems. Cobol applications and mainframe computing continue to dominate a large segment of the business community in which conventional data- and transaction-processing requirements still drive major applications. The requirement to maintain existing Cobol applications supports continued demand for new Cobol programmers. Furthermore, e-commerce applications will require linking existing mainframe applications to the Internet, occupying much of the IS activity for the foreseeable future. In accessing the IS manager's view and the academic's view of Cobol's future, the survey presented found that 95% of its academic respondents and 90% of the IS managers polled want the IS curricula to continue offering Cobol instruction. Also, nearly 90% of IS managers indicate that Cobol instruction in colleges should cover both Cobol's OO and Web based features  相似文献   

16.
Abstract. Information system (IS) innovation can be defined as a novel organizational application of digital computer and information communication technologies (ICT). This paper discusses how modalities of applying ICT technologies in their form and scope exhibit radical breaks, which are introduced herein as ‘disruptive IS innovations’. This notion of disruptive IS innovation is developed by drawing upon and extending Swanson's (1994) theory of IS innovation as well as the concept of radical innovation. Disruptive innovations strongly influence the future trajectory of the adoption and use of ICT in organizational contexts and make the trajectory deviate from its expected course. In doing so, these disruptive innovations distinctly define what an IS is and how it is deployed in order to address current and future organizational and managerial prerogatives. Such changes are triggered breakthroughs in the capability of ICT that lead to the revision and expansion of associated cognitive models (frames) of computing. Disruptive IS innovations are those that lead to changes in the application of ICT that are both pervasive and radical. The pervasive nature implies that innovative activity spans all innovation subsets of the quad‐core model of IS innovation introduced herein. Innovation types include: IS use and development processes; application architecture and capability; and base technologies. Radical in nature, disruptive is innovations depart in significant ways from existing alternatives and lead to deviation from expected use and diffusion trajectory. This paper demonstrates the importance of a concept of disruptive IS innovation by investigating how changes triggered by internet computing (Lyytinen et al., 1998) meet the conditions of a disruptive IS innovation defined herein. The analysis also affirms both the pervasive and radical nature of internet computing and explains how internet computing has fundamentally transformed the application portfolio, development practices and IS services over time. The analysis demonstrates that, with the concept of disruptive IS innovation, we can fruitfully analyse ‘long’ waves of ICT evolution – an issue that has largely been overlooked in the IS community. On a theoretical plane, the paper advocates the view that we need to look beyond linear, unidirectional, and atomistic concepts of the diffusion of IS innovations where innovative activity takes places in a linear fashion by oscillating between small technological innovations and small organizational innovations. In contrast, IS innovation can exhibit fundamental discontinuity; we need to theoretically grasp such disruptive moments. The recent influx of innovation, spurred by internet‐based technology, offers one such moment.  相似文献   

17.
There has been significant empirical work on information systems (IS) innovation. With the advent of a myriad of new and diverse technologies being introduced into contemporary organizations this work is only going to increase in its importance. Unfortunately, results of prior empirical work have been fragmented. Many of these studies treat IS innovations as homogeneous entities and do not effectively integrate notions of IS innovation with general organizational innovation. Swanson (1994) proposes a tri-core model and theory of IS innovation that can help integrate the isolated studies in this area, and can form the foundation on which future study of IS innovation can be based. This paper, in the spirit of a cumulative research tradition, presents and builds on Swanson's framework by incorporating contingencies that might affect the model. Specifically, notions of strategy (strategic push) and technology impact are discussed in the context of the framework. We hope that continued inquiry into this area will facilitate formulation of rich theory that will enable focused inquiry on IS innovation.  相似文献   

18.
RIA富互联网应用系统模式是以浏览器技术为基础,通过开放的用户接口,将C/S程序的丰富用户体验与B/S程序的部署灵活性结合起来的一种网络应用系统模式。该文将RIA的引入到电子商务虚拟实验系统中来。在系统开发中综合运用JSON-RPC、J2EE等技术不仅实现了客户端与服务器端的异步交互通讯,还实现了功能模块和显示模块的分离,提高了系统的可维护性、增强了用户体验性。  相似文献   

19.
In previous studies, some researchers empirically suggested the influence factors on the strategic applications of information systems (IS). However, they did not empirically prove the effects of the relationships among the influence factors on the strategic applications of IS. The objectives of this study are to examine these relationships and to identify the moderating effects of support factors on the relationship between the facilitators of alignment and the strategic applications level of IS. For this study, the research model explaining the relationships among influence factors and strategic applications level was developed. The results suggested that there is significant positive correlation between perceived environmental uncertainty and facilitators of alignment. The intervening effect of alignment facilitators and the moderating effects of support factors were also proved. Based on the empirical results, the roles or functions of influence factors and the managerial implications are proposed.  相似文献   

20.
Information systems (IS) have provided dramatic returns for some organisations. For many others, IS underpin most of their activities. Spending on IS can be very high. Few organisations can function without adequate IS. Yet, there is an apparent paradox in the reliance on information systems and supporting information technologies (IT) on the one hand and the status of the information systems function on the other. While information systems can be critical to an organisation's ability to conduct and develop business, the information systems function is often considered as a secondary activity. To explore the paradox, this paper uses a cultural web model to assess the status of IS and IT activities as evidenced in the literature and through the study of four organisations. These serve to demonstrate the contradiction between the extent to which large organisations appear to rely on information systems and the low status of the information systems function. The implications of this are explored, and it is suggested that IS can be exploited fully only if there is a change in attitude and thereby an increase in status of the information systems function.  相似文献   

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