共查询到20条相似文献,搜索用时 937 毫秒
1.
CORBA规范中新的组成部分“CORBA中的终端移动性和无线访问”填补了CORBA在移动终端和无线访问方面的空白,使得CORBA的应用范围进一步扩大到了移动终端领域。对该规范的关键内容进行了详细描述。 相似文献
2.
移动网络技术成为九十年代研究的热点,为了能在移动网络中开展分布式业务,技术界将中间件技术引入到移动网络中。本文着重阐述了无线CORBA的需求和框架、GIOP隧道及切换,然后给出具体实现与实验。论文的结论是:采用无线CORBA可以达到平滑无线切换、透明性及高效性。 相似文献
3.
4.
宽带无线IP系统移动终端的安全接入技术 总被引:2,自引:0,他引:2
针对目前宽带无线IP系统移动终端的接入现状,本文基于公钥密码机制,提出了一种宽带无线IP系统移动终端的安全接入技术。该技术是无线通信技术、网络技术及密码技术相结合的产物,它不仅解决了目前无线IP系统中移动终端没有接入控制与非安全接入问题,而且完成了移动终端的接入控制,实现了其通信保密功能。持有证书的移动终端既可以本地接入,也可以异地登录,从而保障了其通信漫游功能。理论分析与实验结果均表明,该方案不仅切实可行,而且相比目前技术具有无可比拟的安全性。 相似文献
5.
随着无线互联技术和移动终端技术的发展,手机等移动终端用户对蓝牙产品的功能提出了更高的要求。蓝牙采用推送技术进行数据传输,用户只能选择是否接收,不能对蓝牙发送端的数据进行自主交互浏览。采用J2ME和蓝牙技术实现一种在移动蓝牙终端上使用的交互式系统,有效地利用了J2ME 跨平台的优势,以及蓝牙传送数据易用性和实用性等优点。根据对JSR82规范提供的Java蓝牙无线技术API的研究,给出了蓝牙交互式系统的设计方案和系统结构。通过J2ME的无线应用开发包和MIDlet编程模型,实现了交互式系统。 相似文献
6.
GIS技术、移动终端无线定位技术、空间信息无线传输技术、空间信息移动表现技术的不断发展,为移动空间信息服务的产生和发展提供了新的契机。在分析了移动空间信息服务概念和类型的基础上,提出了移动空间信息服务的体系结构和主要设计思想,最后讨论了实现移动空间信息服务的几个关键技术。 相似文献
7.
该文剖析了静态GIS和移动GIS的概念和区别,介绍了移动GIS涉及到的移动数据库技术、嵌入式操作系统、移动联网技术、无线用户终端技术等关键技术;并指出了移动GIS发展趋势。 相似文献
8.
随着嵌入式技术和无线AdHoc网络技术的发展,无线AdHoc网络应用成为研究的热点。文中设计了基于应用处理器MC9823MX21的无线AdHoc网络终端系统,论述了各个模块的设计思想,给出了设计结构原理框图。采用基于Memory接口的方式,首次将WT4无线网卡成功移植到i.MX21平台上。在嵌入式Linux系统上实现对无线通信模块的支持,成功构建了具有移动自组网和多跳传输的功能的无线移动AdHoc网络,并且实现了各个无线网络终端之间的数据传输通信。 相似文献
9.
基于uSD的情境感知系统设计与实现* 总被引:1,自引:0,他引:1
基于移动终端、情境感知以及无线传感器网络的结合需求,提出了一种应用于移动终端的情境感知系统,包括若干无线传感器节点、情境感知及处理终端、应用服务及执行装置等。针对移动电子设备一般都不具备接入无线传感器网络所需功能单元的现状,利用uSD概念为移动终端设计了一个ZigBee通信功能扩展模块,使移动终端能够从无线传感器网络中获取情境信息,并提供相应的情境感知和处理功能。最后,设计了包含位置等信息的情境感知服务演示系统,初步验证了基于uSD的情境感知系统在移动终端上应用的新颖性和有效性。 相似文献
10.
随着嵌入式技术和无线AdHoc网络技术的发展,无线AdHoc网络应用成为研究的热点。文中设计了基于应用处理器MC9823MX21的无线AdHoc网络终端系统,论述了各个模块的设计思想,给出了设计结构原理框图。采用基于Memory接口的方式,首次将WT4无线网卡成功移植到i.MX21平台上。在嵌入式Linux系统上实现对无线通信模块的支持,成功构建了具有移动自组网和多跳传输的功能的无线移动AdHoc网络,并且实现了各个无线网络终端之间的数据传输通信。 相似文献
11.
12.
《Computer Networks》1999,31(7):741-765
Existing mobile systems (e.g., mobile IP, mobile ATM and third generation cellular systems) lack the intrinsic architectural flexibility to deal with the complexity of supporting adaptive mobile applications in wireless and mobile environments. We believe that there is a need to develop alternative network architectures from the existing ones to deal with the demands placed on underlying mobile signalling, adaptation management and wireless transport systems in support of new mobile services, e.g. interactive multimedia and web access. In this paper we present the design, implementation and evaluation of mobiware, a middleware technology that enables the introduction of new services in mobile networks. Mobiware provides a toolkit that service providers can utilize to build services that can dynamically exploit the intrinsic scalable properties of mobile multimedia applications in response to time-varying mobile network conditions. Based on an open programmable networking paradigm, mobiware runs on mobile devices, wireless access points and mobile-capable switch/routers providing a set of open programmable interfaces and distributed objects for adaptive mobile networking. Mobiware is software-intensive and is built on CORBA and Java distributed object technologies. The source code for mobiware v1.0 is freely available (comet.columbia.edu/mobiware) for experimentation. 相似文献
13.
14.
The Common Object Request Broker Architecture is a specification for creating, distributing, and managing distributed program objects across a network. Both the International Organization for Standardization and X/Open have sanctioned CORBA as the standard middleware architecture for distributed objects. CORBA was specifically designed to support heterogeneous environments, different vendors' products, and several popular programming languages. MICO is an OSS implementation of CORBA. Inspired by the GNU project, the name "MICO" stands for "MICO Is CORBA". MICO has evolved into a mature open source project, with close to a half million lines of source code contributed by more than 150 programmers. The author discusses MICO's internal architecture and then offers a few guidelines to choose the right CORBA implementation for your purposes. 相似文献
15.
Next generation wireless communications system will be required to support the seamless delivery of voice, video and data with high quality. Delivering hard Quality of Service (QOS) assurances in the wireless domain is complex due to large-scale mobility requirements, limited radio resources and fluctuating network conditions. To address this challenge we are developing mobiware, a QOS-aware middleware platform that contains the complexity of supporting multimedia applications operating over wireless and mobile networks. Mobiware is a highly programmable software platform based on the latest distributed systems technology (viz. CORBA and Java). It is designed to operate between the application and radio-link layers of next generation wireless and mobile systems. Mobiware provides value-added QOS support by allowing mobile multimedia applications to operate transparently during handoff and periods of persistent QOS fluctuation. 相似文献
16.
基于CORBA的分布式宽带智能网及其业务的实现 总被引:1,自引:0,他引:1
为了实现分布式业务控制和统一的业务定制,该文将CORBA技术引入智能网,并提出了分布式宽带智能网的体系结构模型。在此基础上讨论了智能网业务的CORBA实现。 相似文献
17.
Pervasive computing is often mentioned in the context of improving healthcare. This paper presents a novel approach for diagnosing diabetes using neural networks and pervasive healthcare computing technologies. The recent developments in small mobile devices and wireless communications provide a strong motivation to develop new software techniques and mobile services for pervasive healthcare computing. A distributed end-to-end pervasive healthcare system utilizing neural network computations for diagnosing illnesses was developed. This work presents the initial results for a simple client (patient’s PDA) and server (powerful desktop PC) two-tier pervasive healthcare architecture. The computations of neural network operations on both client and server sides and wireless network communications between them are optimized for real time use of pervasive healthcare services. 相似文献
18.
19.