ATM in B-ISDN communication systems and VLSI realization

The Asynchronous Transfer Mode (ATM) is considered to be a key technology for B-ISDN. This paper discusses VLSI trends and how VLSI's can be applied to realize ATM switching node systems for B-ISDN. Implementing a practical ATM node system will require the development of technologies such as high-throughput ATM switch LSI's with up to 10 Gb/s capacity and SDH termination technology based on optical fiber transmission. An ATM traffic-handling mechanism with Quality of Service (QoS) controls such as ATM layer performance monitoring, virtual channel handling, usage parameter control, and VP shaping requires several hundred thousand logic gates and several megabytes of high-speed static RAM; VLSI's must be introduced if such mechanisms are to be implemented. ATM node system architecture is based on design principles of a building-block-type structure and hierarchical multiplexing. The basic ATM call handling module, the AHM, is composed mainly of a line termination block and a self-routing switch block; we analyzed this module from the viewpoint of the amount of hardware it requires. Finally, future ATM node systems are discussed on the basis of 0.2-μm VLSI development trends and hardware requirements such as the need for ultrahigh integration of logic gate with memory, multichip modules, and low power dissipation technology     

大型多媒体网络通信中的安全监测平台设计

由于受到大型多媒体网络通信中不安全因素更新迅速的影响,导致以往设计出的大型多媒体网络通信安全监测平台监测能力和响应效果均不高。因而,设计监测能力强、响应效果好的大型多媒体网络通信安全监测平台。该平台的监控中心为数据采集模块,数据采集模块利用RTL8019AS控制器采集大型多媒体网络通信中的节点传输数据和通信节点安全状态数据,为处理模块提供统一格式的待测数据。处理模块利用MSP430处理器对待测数据进行安全检测,其与传输模块直接相连。传输模块会对已处理过的待测数据进行错误检测和传输,其处理流程在软件中给出,软件还给出平台功能图。实验结果表明,所设计的平台监测能力强、响应效果好。     

Network evolution and multimedia communication

The survey analyzes the communication requirements of distributed multimedia applications. To understand the ongoing evolution of networking, we must consider how current and new networking technologies support these requirements. In addition to the functional aspects, the survey investigates how the new technologies blend with existing infrastructures. It concludes with a brief discussion of the higher layer multimedia communication issues     

提高基于因特网的全双工多媒体视频通信性能的方法研究

从TCP/IP协议的特性出发,对视频通信中存在的问题提出了新的解决方法,这不仅有效地防止了死锁、消息阻塞等性能问题,而且使通信中的图像质量有了明显的提高。     

A unified multimedia database system to support telemedicine

A unified approach to managing multimedia medical databases in a telemedicine system is proposed. In order to manage, search, and display patient information more efficiently, we define a patient information package (PIP) as a concise data set of a patient's medical information from each visit. By means of PIPs, both patient-oriented and problem-oriented query strategies, which are most frequently used in daily clinical practice and medical education, can be accommodated. We also provide a unified methodology for accessing various types of patient medical records as well as design two types of user interfaces, high-quality data display and web-based interface, for different medical service purposes. The PIP-based management of databases has been successfully implemented between the National Taiwan University (NTUH), Taipei, and the Chinshan health care center, Chinshan, Taiwan, for teleconsultation, telediagnosis, and tele-education     

SAA7111在图像多媒体中的应用

概述了ＳＡＡ７１１１视频输入处理芯片的主要特点,描述其内部的主要结构及关键功能,提供了一个典型的开发系统,并给出其在彩色图像多媒体中一个成功应用实例。     

Logotype detection to support semantic-based video annotation

In conventional video production, logotypes are used to convey information about content originator or the actual video content. Logotypes contain information that is critical to infer genre, class and other important semantic features of video. This paper presents a framework to support semantic-based video classification and annotation. The backbone of the proposed framework is a technique for logotype extraction and recognition. The method consists of two main processing stages. The first stage performs temporal and spatial segmentation by calculating the minimal luminance variance region (MVLR) for a set of frames. Non-linear diffusion filters (NLDF) are used at this stage to reduce noise in the shape of the logotype. In the second stage, logotype classification and recognition are achieved. The earth mover's distance (EMD) is used as a metric to decide if the detected MLVR belongs to one of the following logotype categories: learned or candidate. Learned logos are semantically annotated shapes available in the database. The semantic characterization of such logos is obtained through an iterative learning process. Candidate logos are non-annotated shapes extracted during the first processing stage. They are assigned to clusters grouping different instances of logos of similar shape. Using these clusters, false logotypes are removed and different instances of the same logo are averaged to obtain a unique prototype representing the underlying noisy cluster. Experiments involving several hours of MPEG video and around 1000 of candidate logotypes have been carried out in order to show the robustness of both detection and classification processes.     

Stream conversion to support interactive video playout

Interactive playout of MPEG-encoded video entails new ways of handling data. Transforming the standard MPEG stream to a local form at the player device enables efficient interactive playout even when available buffer space is constrained. A stream conversion scheme that encodes P frames as I frames after decompression and playout of each P frame eliminates extra memory needs, making P-I conversion a cost effective solution     

Connection architecture and protocols to support efficient handoffs over an ATM/B-ISDN personal communications network

The next generation personal communication network will likely internetwork wireless networks via the ATM/B-ISDN to enable ubiquitous broadband personal communication services. Support of user terminal mobility, particularly the capability for fast and seamless handoffs, over the ATM/B-ISDN is an expected requirement that is not currently met. We propose extensions to the ATM/B-ISDN user transport and signaling network architectures and signaling protocols to meet these requirements. The new architecture employs the Mobile Virtual Circuit (MVC), a dynamic connection tree in which routes are predetermined but not set up for potential handoff connections. During a handoff, associated signaling using source-routing with a new robust adaptation feature is employed for fast resource allocation to establish the handoff connection by distributed control. We also address the new problem of packet ordering synchronization to enable a seamless handoff. The connection tree reconfigures after each handoff to enable continuous support of successive handoffs. The proposed scheme optimizes handoff delay over the ATM/B-ISDN while minimizing unnecessary resource allocation, chances of handoff failure, and call processing load in the intelligent network, and the extensions are backward compatible to current ATM/B-ISDN standards and implementations.This paper was presented in part in PIMRC'95 in Toronto, and Globecom'95 in Singapore. This work was supported by the Canadian Institute of Telecommunications Research (CITR), funded under the Canadian Federal Government's Networks of Centres of Excellence Program.     

应用于多媒体视频文件的快速混沌加密算法研究

为了提高网络多媒体视频文件加解密的安全性和实时性,提出一种改进的混沌密码生成算法。该算法利用时变离散时空系统对Logistic映射数字混沌序列的产生方式进行改进,从而根据初始秘钥生成新的伪随机密钥流序列。AVI视频文件中提取出的各个帧采用新的伪随机序列进行异或操作,得到加密文件。通过Matlab仿真进行视频文件的网络传输加密实验,验证了提出加密算法的可行性。相比传统的混沌加密算法,提出的加密算法具有较高的速度和良好的扩散性能。     

Multimedia and multimedia communication: a tutorial

This paper presents, in a tutorial fashion, the important features of multimedia technology. The specific areas addressed are multimedia and compression standards, computer networks, multimedia transport, and some specific applications employed by industry to date. Multimedia and the effective and efficient communication of multimedia using compression and networks are fused together in this tutorial in an attempt to demonstrate the tight coupling which exists between these two interrelated technologies. First, the techniques and properties inherent in both multimedia and compression standards are presented. Then, the important characteristics of the major local and wide area networks are summarized. Next, the communication techniques for the transport of video and video conferencing are discussed. The new strategies employed to connect homes through cable TV and the telephone companies, as well as the new Ethernet technologies, are also described. Finally, some modern applications of multimedia communication derived from the automotive industry are used to describe the use of this technology in design, manufacturing, and sales     

多媒体家庭平台的系统结构与应用

介绍了多媒体家庭平台（MHP）的基本概念，讨论了MHP对于数字电视和交互电视行业的意义和影响。给出了MHP的框架结构，分析了开发MHP应用的基本步骤。同时给出了Philips MHP原型软件栈和基于此原型开发的中文MHP应用。     

Multi-radio coexistence and collaboration on an SDR platform

In order to support the simultaneous use of both legacy and new radios in a multi-radio handset, a Software Defined Radio (SDR) platform needs to offer coexistence mechanisms and services for radios. This paper proposes an SDR control framework to provide the coexistence services and common interfaces for them. The multi-radio control in proposed platform is divided into two parts, the light-weight dynamic scheduling with tight real-time constraints to solve the temporal interoperability issues between radios, and the semi-dynamic admission control to perform the resource allocation when a radio changes its behavioral pattern. The control framework was implemented on a SDR technology demonstrator, to show how multiple simultaneously active radios are controlled, and how the coexistence mechanism can be used to provide tangible benefits to the SDR modem user, like the ability to utilize fine-grained spectral holes.     

家纺企业协同电子商务平台的开发与实现

采用先进的J2EE技术与Struts框架相结合,后台使用Oracle数据库,设计并实现了基于J2EE的家纺业协同电子商务平台,提出了一种适合协同电子商务平台的用户管理模式,实现了家用纺织品的交易,并采用集中式的基于角色的用户管理模式实现了整个商务流程的协同.     

CORS: A cooperative overlay routing service to enhance interactive multimedia communications

As interactive multimedia communications are developing rapidly on the Internet, they present stringent challenges on end-to-end (E2E) performance. On the other hand, however, the Internet’s architecture (IPv4) remains almost the same as it was originally designed for only data transmission purpose, and has experienced big hurdle to actualize QoS universally. This paper designs a cooperatively overlay routing service (CORS) aiming to overcome the performance limit inherent in the Internet’s IP-layer routing service. The key idea of CORS is to efficiently compose a number of eligible application-layer paths with suitable relays in the overlay network. Besides the direct IP path, CORS can transfer data simultaneously through one or more application-layer paths to adaptively satisfy the data’s application-specific requirements on E2E performance. Simulation results indicate the proposed schemes are scalable and effective. Practical experiments based on a prototype implemented on PlanetLab show that CORS is feasible to enhance the transmission reliability and the quality of multimedia communications.     

Parallel programming models for a multiprocessor SoC platform applied to networking and multimedia

The MultiFlex system is an application-to-platform mapping tool that integrates heterogeneous parallel components-H/W or S/W- into a homogeneous platform programming environment. This leads to higher quality designs through encapsulation and abstraction. Two high-level parallel programming models are supported by the following MultiFlex platform mapping tools: a distributed system object component (DSOC) object-oriented message passing model and a symmetrical multiprocessing (SMP) model using shared memory. We demonstrate the combined use of the MultiFlex multiprocessor mapping tools, supported by high-speed hardware-assisted messaging, context-switching, and dynamic scheduling using the StepNP demonstrator multiprocessor system-on-chip platform, for two representative applications: 1) an Internet traffic management application running at 2.5 Gb/s and 2) an MPEG4 video encoder (VGA resolution, at 30 frames/s). For these applications, a combination of the DSOC and SMP programming models were used in interoperable fashion. After optimization and mapping, processor utilization rates of 85%-91% were demonstrated for the traffic manager. For the MPEG4 decoder, the average processor utilization was 88%.     

Network considerations for distributed multimedia objectcomposition and communication

Terminology is defined, and issues related to providing temporal data integration in a distributed environment are identified. Current technological approaches to the issues are reviewed, and the state of the art is assessed. A unified model for synchronization at three levels, based on previously reviewed approaches, is presented. Directions for future efforts are indicated