蒙特卡罗模拟在库存控制中的应用

分析了现有确定型库存控制模型存在的问题,提出了一种基于蒙特卡罗模拟的随机型库存控制模型,并给出了应用实例．     

Managing ethical requirements elicitation of complex socio-technical systems with critical systems thinking: A case of course-timetabling project

Complex socio-technical systems pose considerable challenges to requirements elicitation due to dynamic boundary conditions and conflicting perspectives. Traditional requirements engineering is criticized for its failure in providing a systemic view, overlooking ethical concerns and marginalized social perspectives. It is argued that educational institutions as a part of society need to ethically develop and manage their academic processes and consider such perspectives for emancipation. This critical qualitative research applies the emancipatory systemic methodology of critical systems thinking (CST) for the requirements elicitation of a complex and dynamic university course-timetables management problem. Firstly, the problem is ethically formulated to mitigate Type III errors. Secondly, multiple viewpoints are sought for boundary judgments using a CST-based ethical inquiry of boundary critique to reveal the normative content of the project design, explore imbalances amongst the socio-technical design components, and unveil the underlying ethical issues. The dynamic stakeholder network captures the system's emergence through stakeholder interconnectedness and boundary liquidity by sweeping-in relevant stakeholders through the continuum of various states of the project. This work enlightens requirements engineering by coupling systemic and socio-technical lenses for the elicitation of ethical requirements and the emancipation of marginalized perspectives in complex and dynamic information systems projects in general and timetabling problems, in particular.     

基于GD32的网络在线烧写技术研究

针对国产微控制器终端设备程序升级需要拆卸设备的问题,提出了基于GD32网络在线烧写固件的方案,通过手持控制器实现对终端设备的应用程序软件升级,达到无须仿真器更新固件程序目的;该方案详细论述了在线烧写系统的组成,在应用编程技术的工作原理,以及上位机程序、手持控制器和终端设备模块各功能设计与实现,并给出了各个模块的使用步骤和方法;终端设备采用多分区操作,保证系统在升级过程中即使发生异常,也不会导致产品变砖,充分提高了系统的可维护性与容错性,手持控制器在外场升级携带方便,维护简单、方便、快捷,实验测试表明,在线更新后的固件程序能够正确运行,从而解决外场拆卸产品和挂载仿真器更新程序的困难。     

Assessing a requirements evolution approach: Empirical studies in the air traffic management domain

Requirements evolution is still a challenging problem in engineering practices. In this paper, we report the results of the empirical evaluation of a novel approach for modeling and reasoning on evolving requirements. We evaluated the effectiveness of the approach in modeling requirements evolution by means of a series of empirical studies in the air traffic management (ATM) domain. As we also wanted to assess whether the knowledge of the method and/or the application domain influences the effectiveness of the approach, the studies involved researchers, master students and domain experts with different level of knowledge of the approach and of the ATM domain. The participants have applied the approach to a real evolutionary scenario which focuses on the introduction of a new queue management tool, the Arrival MANager (AMAN) and a new network for information sharing (SWIM) connecting the main ATM actors. The results from the studies show that the modeling approach is effective in capturing requirements evolution. In addition, domain knowledge and method knowledge do not have an observable effect on the effectiveness of the approach. Furthermore, the evaluation provided us useful insights on how to improve the modeling approach.     

Content-adaptive parameters estimation for multi-dimensional rate control

Multi-dimensional rate control schemes have been recently utilized to adapt video streams to dynamic network conditions and heterogeneous devices. However, current multi-dimensional rate control methods, which estimate the model coefficients using fixed update duration, usually yield inaccurate parameters for dynamically changing video content. To address this problem, a content-adaptive parameters estimation scheme is proposed for multi-dimensional rate control. Firstly, we propose to estimate the parameters using dynamical update duration based on video content and the update duration of the model coefficients is determined by jointly considering the varying picture complexity and feedback information from the actual encoding results, which can improve the model parameter estimation accuracy. Secondly, a coarse-to-fine initial parameter calculation method is proposed to refine the initial frame rate according to the channel condition and the video sequence characteristics. Extensive experimental results show that the proposed solutions outperform the state-of-the-art schemes, especially for video sequences with high temporal and spatial complexity. Furthermore, our algorithm also slightly reduces the computational complexity as compared to related algorithms.     

Comparing attack trees and misuse cases in an industrial setting

The last decade has seen an increasing focus on addressing security already during the earliest stages of system development, such as requirements determination. Attack trees and misuse cases are established techniques for representing security threats along with their potential mitigations. Previous work has compared attack trees and misuse cases in two experiments with students. The present paper instead presents an experiment where industrial practitioners perform the experimental tasks in their workplace. The industrial experiment confirms a central finding from the student experiments: that attack trees tend to help identifying more threats than misuse cases. It also presents a new result: that misuse cases tend to encourage identification of threats associated with earlier development stages than attack trees. The two techniques should therefore be considered complementary and should be used together in practical requirements work.     

基于地域性的旧建筑改造与更新——以奥蒂勒戴克的罗马马克罗当代艺术馆改造建筑为例

论文结合奥蒂勒戴克对罗马马克罗当代艺术馆的建筑改造实例,探讨奥蒂勒戴克对基于地域特性的旧建筑改造的创作手法,以及她对旧建筑如何延续城市文脉和保护历史文化遗产等方面的思考与启示。     

Data and process requirements for product recall coordination

When an organisation becomes aware that one of its products may pose a safety risk to customers, it must take appropriate action as soon as possible or it can be held liable. The ability to automatically trace potentially dangerous goods through the supply chain would thus help organisations fulfil their legal obligations in a timely and effective manner. Furthermore, product recall legislation requires manufacturers to separately notify various government agencies, the health department and the public about recall incidents. This duplication of effort and paperwork can introduce errors and data inconsistencies. In this paper, we examine traceability and notification requirements in the product recall domain from two perspectives: the activities carried out during the manufacturing and recall processes and the data collected during the enactment of these processes. We then propose a workflow-based coordination framework to support these data and process requirements.     

Comments on solid state hydrogen storage systems design for fuel cell vehicles

In recent years, significant research and development efforts were spent on hydrogen storage technologies with the goal of realizing a breakthrough for fuel cell vehicle applications. This article scrutinizes design targets and material screening criteria for solid state hydrogen storage. Adopting an automotive engineering point of view, four important, but often neglected, issues are discussed: 1) volumetric storage capacity, 2) heat transfer for desorption, 3) recharging at low temperatures and 4) cold start of the vehicle. The article shall help to understand the requirements and support the research community when screening new materials.     

MRP支持的毛纺生产管理系统

本文介绍了一个计算机辅助管理系统.该系统利用 MRP 方法,较成功地实现了投料计算和产量监督计算机化.文中着重讨论了根据毛纺生产管理特点对 MRP 方法所作的一些修改.