协同环境下基于角色的细粒度委托限制框架

提出了基于角色的细粒度委托限制框架,将角色分为对象角色和委托角色,实现细粒度的控制.分析了三类委托限制:时间限制、禁止限制和义务限制.针对不同类型定义相应限制规则,并用于描述条件委托和受控使用,条件委托要求满足条件后执行委托操作,防止非法扩散;受控使用约束委托权限,防止权限滥用.多个委托限制规则之间可能冲突,给出了时间复杂度为O(n2)的基于图论的一致性检测算法.     

Interactive media: an Internet reality

While broadcasters test interactive television on small groups of people, millions are working with interactive media each day, using PCs linked to the Internet by phone lines. The activities of this on-line population of today are truly the blueprint for how interactive media will work commercially tomorrow. The author discusses the development of this technology and how it is likely to be used in the future     

Location-oriented coordination in pervasive environments for collaborative work scenarios

Mobile or pervasive environments are inherently characterised by a high degree of dynamics and frequent changes in the environmental properties. This makes collaborative work of mobile users eminently difficult as the coordination of their work processes needs to adapt steadily to these changing circumstances. As location is one of the most critical changing context dimensions, this adaptive coordination and subsequent re-orientation are mostly based on distinctive temporal and spatial objects (the so-called Schelling points). The contribution of this article is to show the benefit of exploiting the human behaviour of using spatial objects for coordination (which we refer to as location-oriented coordination). We present an approach for which we implemented the location-oriented coordination considerations as a coordination pattern embedded in a coordination architecture, which serves as a runtime environment. By adopting this approach in a representative collaborative work scenario (in the domain of emergency management) and by presenting results from user tests we show its applicability and benefit.     

基于Agent的网络协作学习环境的研究与设计

通过对个别化教学中的协作学习和领域知识库的分析以及对多Agent协作技术原理进行研究,引入智能agent的网络协作学习环境,提出并设计了基于智能Agent技术的网络教学系统模型,实现了个性化教学,充分调动了学习者的主动性.     

Interactive computation of coverage regions for wirelesscommunication in multifloored indoor environments

For indoor wireless communication systems, radio frequency (RF) transceivers need to be placed strategically to achieve optimum communication coverage at the lowest cost. Unfortunately, the coverage region for a transceiver depends heavily on the type of building and on the placement of walls within the building. Traditionally, therefore, transceiver locations have been selected by human experts who rely on experience and heuristics to obtain the optimum (or near-optimum) placement. This paper describes an interactive software system that can be used to assist in transceiver placement. It is intended to be easy to use by individuals who are not experts at wireless communication system design. After the user has selected transceiver locations within a graphical floor plan, the system interprets the floor plan and uses simple path loss models to estimate coverage regions for each transceiver. These regions are highlighted, enabling the user to assess the total coverage. This paper describes the methodology used to compute the coverage regions for multifloored buildings and discusses the effect of interference sources. The resulting system is expected to be useful in the specification of indoor wireless systems     

User interest community detection on social media using collaborative filtering

Wireless Networks - Community detection in microblogging environment has become an important tool to understand the emerging events. Most existing community detection methods only use network...     

Correction to: User interest community detection on social media using collaborative filtering

Wireless Networks - The article User interest community detection on social media using collaborative filtering, written by Liang Jiang, Leilei Shi, Lu Liu, Jingjing Yao, Moses Edward Ali.     

协同集成设计环境的通信支持若干问题研究

首先提出了一种直接建立在现有CAD应用内核之上的进程间通信模型,并通过实验研究对此进行了验证。然后提出了支持协同集成设计的通信协议集的一种基本框架。最后研究了对工程中大规模复杂CAD图形数据进行协议映射和动态传输的基本方法。实践证明,比现有交换数据文件和传输应用界面方法,在网络通信的时间/空间效率上具有显著优势。*     

A modular algorithm-theoretic framework for the fair and efficient collaborative prefetching of continuous media

Bursty continuous media streams with periodic playout deadlines (e.g., VBR-encoded video) are expected to account for a large portion of the traffic in the future Internet. By prefetching parts of ongoing streams into client buffers these bursty streams can be more efficiently accommodated in packet-switched networks. In this paper we develop a modular algorithm-theoretic framework for the fair and efficient transmission of continuous media over a bottleneck link. We divide the problem into the two subproblems of (i) assuring fairness, and (ii) efficiently utilizing the available link capacity. We develop and analyze algorithm modules for these two subproblems. Specifically, we devise a bin packing algorithm for subproblem (i), and a "layered prefetching" algorithm for subproblem (ii). Our simulation results indicate that the combination of these two algorithm modules compares favorably with existing monolithic solutions. This demonstrates the competitiveness of the decoupled modular algorithm framework, which provides a foundation for the development of refined algorithms for fair and efficient prefetching.     

适应互动数字电视业务的交互网络设计

探讨在IP QAM模式下,为保证互动数字电视业务系统的可靠稳定运行,在设计交互网络整体架构以及视频流网络、交互前端内部受理网络、交互信令网络等方面的性能要求、具体方案以及注意事项。     

Interactive computing

In the approximately fifteen years since the beginnings of time sharing, or interactive computing, this mode of operation has greatly influenced the development of computing systems. To summarize this development, a brief review of the projections of a decade ago is made, and then the developments of the intervening years are considered under the headings of hardware, process structure, operating systems, and system models. Finally, some predictions of future developments are made, based on observations of the still rapidly evolving technology and the resultant trend toward the special-purpose application of digital systems.     

Interactive television

Interactive television (ITV) is a new form of residential consumer video service that gives viewers far greater control over the contents of programs than is possible with conventional television. There are substantial technical challenges to offering a ITV service on a large scale, both in content creation and delivery. The paper discusses those challenges and presents a new system architecture for offering ITV, along with a broad range of other interactive video services, to consumers in their homes. A new suite of tools to simplify the creation of compelling interactive programming is also described     

Nival Interactive恶魔岛

游戏中共有三座岛屿,分别有不同的特色,一个是充满着森林,地穴与地下城的岛屿,整座岛屿充满着绿意,在这座岛屿中野猪,盗贼,蝙蝠与熊到处肆虐,岛屿中包含着星状密布的区域,也是玩家一开始所出现的地点。一个是暴风雪肆虐的岛屿,岛上遍布着积雪,这是游戏中某个大帝国所统治的领地,这里没有大城市,全是一些小村庄,所以玩家在这里的补给将很少。帝     

交互性纹理合成

扩充了Efros与Freeman的图片缝合算法,添加了图形用户界面,从而可以动态地改交参数,并对算法做了一些改进,增强了用户对纹理合成的可控性并丰富了合成纹理的多样性.     

Interactive image-guided neurosurgery

Interactive image-guided (IIG) surgery involves the synchronal display of the tip of a surgical device on preoperative scans. This display allows the surgeon to locate the present surgical position relative to the final site of surgical interest. We have developed a technique for IIG surgery device based on a six-degree-of-freedom articulated arm. Design accuracy for the arm is less than 0.1 mm and the present implementation has a submillimetric accuracy. The display can show the surgical position on any tomographic image set with simultaneous display on up to three image sets. Laboratory results and clinical applications are discussed.