Design and Implementation of 4S‐Van: A Mobile Mapping System

Recent advances in positioning and photogrammetry technologies have made it possible to build a mobile mapping system (MMS) that can obtain 3D coordinates of geographic objects from stereo images recorded from a moving vehicle. In this paper, we present a design and detailed implementation of an MMS called a 4S‐Van. Furthermore, we present four issues that have made major contributions to the performance of an MMS: 1) CCD camera calibration, 2) GPS signal condition, 3) integrating a GPS, inertial navigation system (INS), distance measurement indicator (DMI), and CCD cameras, and 4) the orientation angle of CCD cameras. In the experimental results, the performance of an MMS was analyzed for each component, giving an idea of how to effectively design and integrate each component in developing an MMS to get a maximal accuracy of 3D coordinates.     

An analysis of the MMS object model

MMS (Manufacturing Message Specification) is an OSI application protocol designed for the remote control and monitoring of industrial devices. In this paper, we study the MMS object model: the notion of class, naming, inheritance and structuring. We show that MMS is designed for simplicity but that some notions are not dealt with homogeneously in all classes of MMS objects     

Protocol design and performance analysis for manufacturing messagespecification: A Petri net approach

The manufacturing message specification (MMS) is the ISO standard communication protocol specific to manufacturing. To analyze MMS design and performance, service unit automats are introduced to represent individual MMS services, while service connection Petri Nets (PNs) are constructed from these automats to describe MMS service connections and processes. This approach makes MMS protocol specification and analysis possible in terms of well-developed concepts and methods in PN theory. It leads to a distributed and hierarchical model of MMS software system by integrating service connection PNs. A generalized stochastic PN for MMS performance evaluation is obtained by incorporating service parameters and time factors into the model. A technique based on T-invariants is used to simplify the performance analysis     

深入了解MMS

介绍了MMS(多媒体消息服务)技术的相关内容,对其系统结构、信息流的传输和消息编码进行了重点分析,同时对基于MMS的应用和MMS标准的研究工作进行了简单的描述。     

Implementation solutions for the interworking between MMS and streaming

Multimedia messaging service (MMS) and streaming are forerunner multimedia applications in mobile communication. Use of streaming in the retrieval of continuous multimedia content of MMS is the identified optimum scope (extent) of interworking between MMS and streaming. The optimum interworking can remove a limitation visible in MMS—retrieving content requiring more storage space than available in a mobile terminal. This paper presents two different solutions for implementing the interworking. The implementation solutions are consistent with the existing mobile frameworks and the working principles and procedures of both MMS and streaming. Consistency is very important here not only to avoid creating isolated solution, but also to preserve user experience. This paper describes in detail how each of the solutions operates, including the process of using streaming in the MMS retrieval. Pros and cons of both the solutions are also analysed to compare those. Other important factors tackled in the analysis are implementation flexibility, complexity, terminal capability indication, and content adaptation. Copyright © 2003 John Wiley & Sons, Ltd.     

基于MMS Client-OPC Server的数字变电站通信实现

介绍了IEC61850的主要内容、组成和特点,说明了将IEC61850标准应用于变电站整体通信的原理和结构,详细分析了变电站与IED之间的通信原理与实现,着重介绍了基于AX-S4 MMS(MMS Client-OPC Server)的通信结构以及具体实现流程.基于AX-S4 MMS软件建立了站内服务器与间隔层IED之间的MMS连接,并开发了应用于该标准的OPC客户端访问软件.实例说明,该通信方式便捷、高效,能够实现变电站级各种通信要求.     

MMS在世界范围升温

MMS并不是SMS业务简单的升级或者替代,而是共存和互补的关系。2G、2.5G和3G都支持MMS的应用,但只有GPRS网络或者3G网络才能充分发挥MMS业务的特色,用户才可能充分享受到MMS所带来的好处。MMS在世界范围的升温主要有两个原因,一是由于终端技术的发展和成熟,二是因为MMS是未来3G可支持的众多业务的基础,目前对运营商来说,可在培育市场增加收入上发挥作用。     

MMS(多媒体短消息业务)及其实现

MMS是3GPP和WAP论坛制订的移动数据业务。与SMS相比，它除了可以发送简单文本消息外还可以发送图像、音频、视频、动画等多媒体信息内容。文中对MMS的体系结构进行了介绍，对MMS系统两种实现方式：基于WAP的实现和基于IP的实现进行了探讨，最后还对MMS业务的部署进行了讨论。     

A single-chip U-interface transceiver for ISDN

The authors discuss system and implementation aspects of a 144 kbit/s one-chip U-transceiver based on echo-cancellation techniques using the MMS43 line code and a Barker synchronization word for bit and frame timing, and including a 1-kb/s transparent channel for maintenance purposes. The LSI is realized by a 2-/spl mu/m CMOS, double-metal, double-poly technology shrinkable to a 1.5-/spl mu/m technology and packaged in a 28-pin DIL (dual in-line) package.     

MMS: An autonomic network-layer foundation for network management

Networks cannot be managed without management plane communications among geographically distributed network devices and control agents. Unfortunately, the mechanisms used in commercial networks to support management plane communications are often hard to configure, insufficiently secured, and/or suboptimal in performance. This paper presents the design and implementation of the Meta-Management System (MMS), a network-layer subsystem that provides robust autonomic support for management plane communications. We demonstrate the practicality of the MMS via a fully functional implementation that runs on commodity hardware, and experimentally show that the MMS is efficient and scalable. The MMS software is freely available.     

MMS系统网络结构和模块功能分析

多媒体消息服务是近年来发展活跃的移动终端业务,介绍了一种综合的多媒体消息服务网络结构,引入了服务器代理和移动终端用户代理来优化多媒体消息服务中心的性能,服务中心的适配机制使不同性能的手机终端得到协调使用.     

MMS发送关键技术研究

随着TD-SCDMA网络建设的不断完善,在3G网络上的多媒体业务有着广泛的应用前景.根据在TD-SCDMA网络中基于WAP协议成功实现MMS(彩信)发送的实例,本文介绍了WAP协议产生的背景及其结构,彩信MMS PDU封装格式,详细说明了客户端与WAP网关的连接、中文字符的编解码、图像格式、SMIL语言应用等关键性问题.同时给出了发送实例中MMS PDU的结构图,清晰的说明了MMS(彩信)发送中的封装格式,并针对相应的问题提出了解决方案.     

Android智能手机彩信业务分析与测试

Android是目前用户量最大的智能手机操作系统,彩信是基本的移动通信业务之一。Android虽然内置了彩信应用程序,但并没有为彩信业务提供专用的开发接口,从而加大了开发和测试的难度。本文分析了原生Android系统中彩信协议数据单元的构造,以及彩信的发送和接收流程,然后介绍了为彩信业务测试而开发的Android应用程序。     

MMS系统与SMIL语言

介绍了多媒体消息服务(MMS)技术的相关内容,对其系统结构、系统功能进行了分析.并介绍了SMIL语言的基本结构,对其在MMS系统中的地位和作用进行了分析.阐明了SMIL语言和MMS系统是现代多媒体消息通信业务中不可缺少的重要技术.     

MMS在中国市场的成功运营之道

MMS作为移动通信运营商最近推出的一类业务新品．受到了众多国外手机厂商的热情追捧。MMS在国内市场的成长空间有多大?手机厂商的对策是什么?本文试图运用SWOT战略分析矩阵及三点效用模型对MMS手机的市场进入机会及厂商的营销策略进行研究，旨在探讨MMS在中国市场的成功运营之道。     

一种基于IP的彩信收发模块设计

这里使用WinInet API设计实现了基于IP方式的彩信收发模块。该模块具备与彩信中心（MMSC）通过HTTP方式交互的功能,除了使用IP方式提高发送成功率外,还通过异步工作方式实现了彩信并发、收发进度显示以及中途终止发送和接收的扩展功能,并充分考虑了网络较差的情况。结果表明,该设计优于传统的WAP方式的实现方案。同时,该设计也扩展了无线上网卡的功能,增加了其附加值。     

中介逻辑与中介公理集合论的综述

以中介逻辑演算系统和中介公理集合论为主要内容的中介数学系统是一种在数学基础意义上将精确性量性对象扩展到模糊量性对象的系统,它对数学的逻辑基础和集合论研究产生了重要影响。文中主要从下面3个方面论述：中介数学系统的研究背景;中介数学系统的基本内容及其与经典数学系统的关系,其中简要介绍了中介概念、中介原则、中介逻辑演算系统、中介公理集合论和中介数学系统的研究现状;有关中介逻辑的学术争论,特别围绕中介逻辑是不是一个新逻辑引用了正反双方的意见。此外,还展望了中介数学系统的应用前景。     

Improved implementation solution and general mobile network architecture for the interworking between MMS and streaming

The prospects of multimedia in mobile communication depend largely on effective design of interactive multimedia applications now. Multimedia Messaging Service (MMS) and streaming are two potential multimedia applications for mobile communication. Though MMS has many advantages, a limitation is noted in MMS—an inability to handle a message requiring more space than available in a mobile terminal, as the message must be fully retrieved and stored before its presentation. Moreover, a large message can keep a recipient user waiting long for its retrieval before it is presented, causing poor user‐experience. This paper proposes a new implementation solution for the interworking between MMS and streaming to overcome the limitation. The new solution is consistent with the existing frameworks and working principles of both MMS and streaming. The new solution is compared with the previous solutions, indicating that it has considerable advantages. This paper also presents general network architecture, providing various architectural options, to accommodate the interworking in different situations. The architecture considers many practical cases, like person‐to‐person messaging, messaging involving content providers and multiple network operators, load balancing and scalability in related network servers, operational agreement between a content provider and a network operator, and using existing network infrastructure for the interworking. Copyright © 2005 John Wiley & Sons, Ltd.     

移动智能网多媒体消息业务的体系结构及其协议

多媒体消息业务(MMS，multimedia messaging service)作为一种新的移动数据业务已经得到了大规模的应用，在移动智能网上也可以支持这种业务。ITU-T、ETSI对移动智能网支持MMS并无相应的规范，目前国内计划采用的是SCP(service control point)与MMSC(multimedia messaging service center)互联的解决方案。本文在对此方案做详细分析的同时，提出了基于CAMEL(customized application for mobile enhanced logic)的MMS体系结构，并对此进行了深入的探讨。在此基础上，分析计算了智能多媒体消息业务对SCP及信令链路造成的影响。     

多媒体信息服务系统中的转码技术研究

多媒体信息服务MMS是一项全新的移动数据业务，是一个涉及终端设备制造商、网络运营商、内容和应用提供商的综合性移动解决方案。转码是一种对媒体内容进行调整以满足与特定环境有关的约束与爱好的技术．能使MMS信息在不同的网络与移动终端无缝地传输与表示，是MMS成功应用的关键。文章在介绍转码技术原理的基础上，详细阐述了MMS应用中的三种类型转码的关键技术，并讨论了各种类型转码中要解决的主要问题。