基于Petri网的企业业务流程集成的研究

传统的业务流程集成过程包含五个主要的步骤——业务流程集成建模、仿真、执行、监控和优化。这五个步骤组成了一个闭环,以期达到最佳的集成效果。虽然这个步骤已经得到广泛应用,但还是存在着一些不足。文章将上面提到的业务流程集成步骤与层次Petri网理论结合起来,提出了一个改进的业务流程集成步骤。这个步骤可以解决原步骤中执行周期长、消耗大的问题。同时,着重论述了其中的一个主要步骤——业务流程集成建模,这也为业务流程集成在实际项目中的应用奠定了理论基础。     

Bayesian Network for Risk of Diarrhea Associated with the Use of Recycled Water

Estimating potential health risks associated with recycled (reused) water is highly complex given the multiple factors affecting water quality. We take a conceptual model, which represents the factors and pathways by which recycled water may pose a risk of contracting gastroenteritis, convert the conceptual model to a Bayesian net, and quantify the model using one expert's opinion. This allows us to make various predictions as to the risks posed under various scenarios. Bayesian nets provide an additional way of modeling the determinants of recycled water quality and elucidating their relative influence on a given disease outcome. The important contribution to Bayesian net methodology is that all model predictions, whether risk or relative risk estimates, are expressed as credible intervals.     

Robust gate assignment procedures from an airport management perspective

The assignment of aircraft arriving out of schedule to available stands at the terminal is a major issue with feasible solutions when stands are placed in the same zone, but it is very difficult to solve when candidate alternative stands are placed in different zones due to passenger movement through the terminal. In order to tackle arrival delays while preserving quality factor services to passengers and protecting turnaround aircraft times, most airports have modified their infrastructure by increasing the number of stands at the terminal. In this paper a simulation-based experimental approach that evaluates the minimum amount of stands at the terminal necessary to cope with arrival/departure pattern traffic under a time delay limit is presented. Emergent dynamics are analyzed when the number of stands is increased and a causal model to evaluate shortages and benefits of different policies and strategies for gate assignment to mitigate undesirable consequences is introduced.     

试论中介机构和政府在区域创新网络中的作用

本文探讨了区域创新网络的概念及其特点,重点讨论了中介机构和政府在构建区域创新网络、促进技术创新中的作用。作者认为区域创新网络的功能旨在使产生创新的元素:人才、技术、信息和资金在网络中迅速流动起来,并且通过每个网络节点本身的创新来实现技术创新。     

Pelof语言的一种操作语义模型

Pelof 是一种融合 Petri 网、逻辑和函数三种风格的作用式并行程序设计语言.它的基本成分是谓词和函数,Petri 网体裁提供并行控制的工具.文献[5]中给出了 Pelof 语言的文法及设计思想.本文在文献[1,2]工作的基础上,以 FFP[3]为抽象机,采用形式化的方法为 Pelof 语言塑造了一种操作语义模型.     

一种数据链路层协议的Petri网模型

本文介绍了Petri网和数据链路层协议的一个Petri网模型，并且用S不变式和T不变式证明了该网的活性及其它性质。     

Not by Rent Alone: Analysing the Pro‐Poor Functions of Small‐Scale Fisheries in Developing Countries

The dominant view in academic and policy arenas is increasingly one in which the major contribution of capture fisheries to development should be derived from the capacity of society to maximise the economic rent of fishery resources. Drawing upon empirical experience from the South, this article highlights the potentially disastrous consequences that a universal implementation of the rent‐maximisation model would have in developing countries, and argues that a more gradual approach would be preferable. The welfare function of small‐scale fisheries, namely, their capacities to provide labour and cash income to resource‐poor households, should be preserved until the appropriate macroeconomic conditions for rent‐maximisation and redistribution are fulfilled.     

Investigating the effect of product variants,and demand distributions on the optimal demand supply network setup

In today's marketplace, consumers are looking for product variety and low prices. In this paper, we investigate how product variation and demand distributions affect demand supply network optimality in a real-life based setting. The research methodology was based on a novel Petri net formulation, which employs reachability analysis to demand supply network optimisation. We found that in our case study localised final assembly is justified with one or two product variants, but a centralised production should be favoured with three or more product variants. We also noted the sensitivity of this result to transport cost/inventory carrying cost tradeoff.     

读懂扬雄与《扬子法言》的现代阐释

扬雄人难"懂",文亦难"读",故对扬雄其人其作历来非议甚多,甚至成为中国文化史上一桩绵延两千年之久的历史"公案"。《扬子法言》内容繁杂,思想幽邃,语言简奥,历来歧解百出。《扬子法言今读》的现代阐释,化繁为简,深入浅出,远绍先哲,开启来者,对读"懂"扬雄,作了很好的疏解工作,颇有学术价值和时代意义。     

基于OGSA的网格工作负载监测系统研究

为对网络系统进行实时管理并适应其动态变化,需要对其工作负载进行监测,因此提出网格工作负载监测体系结构。该体系结构以端到端的方式对基于OGSA的网格构件的工作负载进行监测,以便进行分类和确立相互关系。通过设计的监测点算法,建立Petri网模型,该模型能自动收集工作单元的数据,为网格用户提供监控数据信息浏览,有利于用户对系统性能进行有效管理。在建立上述体系结构的基础上,提出了未来扩展系统功能方面的思路,以适应网格环境的复杂性,减少通信延迟和通信代价,为用户更好地监测网格系统提供方便。