Research Issues in Ad-Hoc Distributed Personal Networking

This paper discusses the research issues that need to be addressed in order to create a personal distributed environment where people interact with various companion, embedded, or invisible computers not only in their close vicinity but potentially anywhere. These systems are called personal networks (PNs). They constitute a category of distributed systems with very specific characteristics. They are configured in an ad hoc fashion, as the opportunity and the demand arise, to support personal applications. PNs consist of communicating clusters of personal digital devices, devices shared with other people and even infrastructure-based systems. At the heart of a PN is a core Personal Area Network (PAN), which is physically associated with the owner of the PN. Unlike the present PANs that have a geographically limited coverage, the Personal Operating Space, PNs have an unrestricted geographical span, and incorporate devices into the personal environment regardless of their geographic location. In order to do this they need the services of infrastructure-based networks and ad-hoc networks to extend their reach. A PN extends and complements the concept of pervasive computing. We show that PNs introduce new design challenges due to the heterogeneity of the involved technologies, the need for self-organization, the dynamics of the system composition, the application-driven nature, the co-operation with infrastructure-based networks, and the security hazards. We discuss the impact of these problems on network design, assess present and proposed solutions, and identify the research issues. This revised version was published online in August 2006 with corrections to the Cover Date.     

模余代数和Morita-Takeuchi关系

H是Hopf代数,C是H-模余代数.首先利用余积分的概念,诱导C的右H-余模结构,并构造了smash余积余代数C×H,使C×H作为余代数同构于C H.然后,由C的右H-余模结构诱导C的左H0-模结构,令C=C/KerεH0C,则C×H与C有Morita-Takeuchi关系.     

Going Wireless,Enabling an Adaptive and Extensible Environment

This paper discusses limitations in existing and projected solutions for delivering applications to mobile users (e.g., in 3G) in an increasingly diverse heterogeneous wireless infrastructure in combination with the on-going deregulation of mobile communication and with an increasing number of more narrowly defined roles of parties participating in the delivery of applications to mobile users. Furthermore, for future service growth, users need to be the center of communication via applications that take into account the user's context or the context of their communication based on any event and not just the invocation or release of communication resources. This calls for entirely rethinking the architectures and frameworks for the delivery of services, in order to create open and scalable support for the negotiation between participating entities with a minimum of a priori and shared knowledge, thus providing an adaptive and extensible environment for user-centric communication. This paper presents a novel architecture and components with these properties and discusses the merits of the approach, followed by a discussion of experimental results demonstrating the feasibility of applying this architecture.     

基于消息的监控软件人机交互平台的开发

文章简要说明了传统人机交互系统所存在的问题并提出了一种新的人机交互系统的设计平台。应用组件设计的思想以及模拟消息映射的技术，采用客户／中间层朋＆务器的结构模式，开发了基于该平台的新一代监控软件的服务器程序及客户程序。由于服务器程序和客户程序遵循平台的协议规范，不同的客户程序与服务器程序之间可以使用通用的方式进行数据交换，从而大大加强人机交互程序的扩展性和灵活性。     

A New Access Control Solution for a Multi-Provider Wireless Environment

The fundamental goal in future 4G mobile multi-service networks is to provide an efficient mobile computing environment. We presume that future terminals will be equipped with multiple heterogeneous wireless interfaces. We want to enable each user to seamlessly move between different providers networks. Besides seamless roaming, a key consideration is also devoted to quality-of-service provision. In this article, we propose a model and an architectural framework for supporting quality of service in the context of interconnected multi-provider wireless systems. The proposed integrated COPS-based management and RADIUS-based access control architecture will allow providers to offer multimedia services while optimizing the use of the underlying network resources. We suggest new concepts and protocols to provide solutions to these challenges and describe the French national research project named MMQoS aiming on building such future networks.     

Morita Contexts and their Lattices of Relations

We study the interaction between the lattices of relations of members of a general Morita context. The pairs of reversing-order maps are defined, which determine the dualities between the lattices of ‘closed’ relations. Under rather weak conditions, these dualities can be composed obtaining the projectivities defined by simple maps. PACS: 02.10.De,02.10.Hh.     

关于Quotient Context of Morita Context的讨论

本文讨论了ＱｕｏｔｉｅｎｔＣｏｎｔｅｘｔｏｆ Ｍｏｒｉｔａ Ｃｏｎｔｅｘｔ的一些性质,并在此基础上证明：如果ＤＲ是一个完备Ｇａｂｒｉｅｌ拓扑,则一个（Ｐ,Ｑ）的商（Ｐ,Ｑ）作为Ｒ与Ｓ之间ＭＣ,它的商同构于（Ｐ,Ｑ）的一个商。     

Fundamental Concepts of Collective Intelligence

A collective intelligence consists of a large number of quasi-independent, stochastic agents, interacting locally both among themselves as well as with an active environment, in the absence of hierarchical organization, and yet which is capable of adaptive behavior. The major concepts arising from our current understanding of collective intelligence are reviewed. These include stochastic determinism, interactive determinism, nondirected communication, nonrepresentational contextual dependency, stigmergy. These are illustrated using examples drawn from the literature on ant behavior. Several speculations into the dynamics of collective intelligence are presented, including nondispersive temporal evolution, broken ergodicity and broken symmetry. Several questions for future study are posed.     

科普体验中的认知、偏好与信念研究

科普体验是对科普内容的参与、认知和选择过程,受众从中获得情感愉悦和理性层次的升华。科普受众的偏好和信念影响了科普体验的决策和认知,行为科学能够很好地解释科普体验从偏好信念向决策认知的转化过程。本文利用行为科学原理设计了心理账户实验和信息瀑布实验,分别考察科普体验的消费和认知选择。研究结果发现,科普体验受众按心理账户决定是否进行科普体验消费,同样的资金具有非替代性,得失编码规则影响体验选择,教育和学习因素是促使受众进行科普体验活动的最关键要素。在科普体验过程中容易出现信息瀑布,科普受众对科学知识的认知受到前人的影响。     

基于组合上下文的服务替换方法

随着用户需求的多样性和网络环境的日益复杂性,组合服务的复杂程度越来越高,在对失效服务进行替换时,为了减少被替换服务的冗余信息和提高替换方法的准确性,提出以待替换服务的组合上下文为研究对象,通过以下2个步骤完成替换:第一,基于已有的着色petri网服务工作流建模方法,提出服务的组合上下文信息采集算法(CCICA,composition context information collection algorithm),以服务的组合上下文为服务信息采集源;第二,提出基于编辑距离的服务替换方法(LDBSSM,levenshtein distance-based service substitution method),并将服务接口的依赖关系加入到了算法中.仿真实验表明,该方法不仅较好地减少了被替换服务的信息冗余,而且有效提高了服务替换的准确性,具有更好的实用价值.