时间触发CAN总线系统的建模与性能分析

时间触发机制的引入提高了CAN总线对实时周期性消息的处理能力,然而系统中的非周期性消息具有迸发性、不可预知性和类型复杂的特点,对其传输性能的分析较为困难。该文利用确定随机Petri网理论建立了时间触发CAN总线系统的模型,通过仿真对异步相中非周期性消息传输进行吞吐量和平均延时等性能分析,得出了相应的量化规律,其结论对时间触发CAN总线系统的分析与设计具有指导意义。     

网络读写的主体重构

电脑网络作为神经的电子化延伸,改变了人类的感知、记忆与表达方式。实时互动的交流结构使当代阅读、写作和批评模式都发生深刻转变,作者与读者身份日益模糊以至颠倒。电子记忆、屏幕空间和网络通讯不仅作为技术中介,更作为精神交流的基本形态,以“远程在线”的方式重建着文学活动的主体间关系。     

The gendered dimensions of bushfire in changing rural landscapes in Australia

This paper examines gender differences in awareness, preparedness and attitudes towards bushfire amongst landholders in rural landscapes affected by amenity-led in-migration in southeast Australia. It considers the potential of conceptualising bushfire not as a gender-neutral natural phenomenon but as an important means by which traditional gender roles and power relations within rural landscapes are maintained. Landholders were found to uphold conventional views of bushfire management as “men’s business” despite changing social circumstances. Consequently, key gender differences exist within landholders’ bushfire risk awareness, bushfire knowledge, the perceived need for bushfire preparedness measures, the willingness to perform certain tasks, and the belief in personal capacity to act. We argue that covert and less visible as well as overt gender roles and traditions are important factors in understanding landholders’ engagement with bushfire management. When gendered dimensions of bushfire are investigated in the context of hegemony, a paradox emerges between women choosing not to take control of their own bushfire safety and women being denied the opportunity to take control. The complex and contradictory actions and attitudes to bushfire that materialise through an analysis of gendered social experiences complicate attempts to create more gender-sensitive frameworks for bushfire management. The tenacious and embedded nature of gender role divisions within both public and private spheres was furthermore found to act as economic, social and political stumbling blocks for empowerment opportunities. Using a mixed-methods research approach, this paper maps out gendered dimensions of bushfire through landholders’ narratives and actions. The implications of these dimensions for bushfire management have direct relevance to recent international discussions of the vulnerability of the growing number of people living in bushfire-prone rural–urban interface areas.     

视错觉在交互界面设计中的应用

掌握视错觉在交互界面设计中的应用规律,能使交互设计更加符合人的生理及心理特征,提升用户体验。以视觉认知心理学和生理学的理论依据为切入点,结合交互设计特点和理念,展开针对交互界面的视错觉应用研究,总结出五条应用规律。     

基于TwinCAT的袖衩机数控系统

针对目前市场上的数控系统在袖衩机上应用的开放性、通用性以及兼容性程度低的问题,从新型自动袖衩机的 工作原理和机械结构出发,对控制系统的硬件进行了选型,并采用了基于IPC平台结合PROFIBUS现场总线,利用某公 司的TwinCAT工控软件平台的软件式控制方案,设计出了符合系统要求的人机界面,实现了控制系统软件部分的功能。 结果表明该系统简化了袖衩机数控系统操作程序,提高了袖衩机数控系统的开放性、通用性和兼容性。     

Joint Pricing and Contingent Free-Shipping Decisions in B2C Transactions

We consider an online retailer's joint pricing and contingent free-shipping (CFS) decisions in both monopoly and duopoly structures, which is an important marketing-operations interface problem. We begin by investigating the impacts of a retailer's decisions on consumers' purchase behaviors, and show that the CFS strategy is useful to acquire the consumers with large order sizes. Then, we compute the probability of repeated purchases, and construct an expected profit function for an online retailer in the monopolistic setting. We find that the fixed shipping fees may have the largest impact on the retailer's profit among all shipping-related parameters, and the retailer can benefit more from homogeneous markets than from heterogeneous ones. Next, we consider the competition between two retailers in the duopoly structure, and analytically show that, if two retailers have identical fixed and variable shipping fees, then their equilibrium decisions are equal. In order to numerically find a Nash equilibrium for two retailers, we develop a simulation approach using Arena and OptQuest. Our simulation-based examples suggest that, as a result of the competition, the two retailers should decrease their profit margins but increase their CFS cutoff levels if they have the same fixed and also the same variable shipping fees.     

新形势下龙头企业与农户和谐共生的逻辑路径

在农产品质量安全保障体系中,农产品供应链源头管理的重要性更为突出。企业与农户和谐共生目标的实现依赖于畅通的共生界面、较强的联合依赖性以及联合价值创造等战略选择,依赖于上述战略选择所形成的双边锁定效应为共生双方合理分享利益提供的正向激励。     

Joint Mail‐In Rebate Decisions in Supply Chains Under Demand Uncertainty

We study the joint decisions of offering mail‐in rebates (MIRs) in a single‐manufacturer–single‐retailer supply chain using a game theoretic framework. Either party can offer an MIR to the end consumer if it is in his best interest. The consumer demand is stochastic and depends on the product price and the amount of MIRs. When the retail price is exogenous, we show the existence of a unique Nash equilibrium under both additive and multiplicative demand functions and characterize it completely. We show that any of the following four scenarios can be the equilibrium: both parties offer MIR, only one party offers MIR, none offers MIR. When the retail price is a decision variable for the retailer and the rebate redemption rate increases with the amount of MIR, we once again prove the existence of a unique Nash equilibrium where both the retailer and the manufacturer offer MIRs. Using a numerical study, we show that the average post‐purchase price of the product is higher not only than the perceived pre‐purchase price but also than the newsvendor optimal price without an MIR. This implies that an MIR makes a product look cheaper while the consumers actually pay more on average.     

关于Windows Sockets套接口的使用

介绍一种开放式、多协议的网络编程接口—WindowsSockets规范 ,详细介绍规范中套接口的概念及编程原理 ,说明了套接口的共享 ,如何确定它能使用的最大套接口数。     

Home‐based Telework,Gender, and the Synchronization of Work and Family: Perspectives of Teleworkers and their Co‐residents

This article explores the relationship between work–family roles and boundaries, and gender, among home‐based teleworkers and their families. Previous literature suggests two alternative models of the implications of home‐based work for gendered experiences of work and family: the new opportunities for flexibility model and the exploitation model. Drawing on the findings of a qualitative study of home‐based workers and their co‐residents, we argue that these models are not mutually exclusive. We explore the gendered processes whereby teleworking can simultaneously enhance work–life balance while perpetuating traditional work and family roles.