基于SOA的嵌入式安全关键中间件

由于嵌入式安全关键系统自身的特点和应用环境的特殊性,导致了设计分布式嵌入式安全关键应用比一般的嵌入式实时应用要困难得多。提出了一种新的基于SOA构架的自适应安全关键中间件,极大地简化了嵌入式安全关键系统应用的开发,并对相应的体系结构和关键技术进行了讨论。另外,针对嵌入式安全关键系统运行环境的特殊性,重点讨论了SOA构架中基于动态配置服务的端到端的自适应QoS管理机制和实时容错机制的设计和实现。     

嵌入式自适应安全关键中间件设计方法研究

由于嵌入式安全关键系统自身的特点和应用环境的特殊性,导致了设计嵌入式安全关键应用比一般的嵌入式实时应用要困难得多。在分析传统嵌入式实时中间件技术应用于嵌入式安全关键系统不足的基础上,提出了一种新的自适应安全关键中间件(ASCM)的设计方法,并对相应的体系结构和关键技术进行了讨论。另外,针对嵌入式安全关键系统运行环境的特殊性,重点讨论了一种端到端的自适应服务质量(QoS)管理机制。     

基于μC/OS-II的嵌入式系统的设计

嵌入式系统的应用正快速发展,而嵌入式系统的设计和嵌入式操作系统是其中的关键。由于大多数嵌入式操作系统价格昂贵、源码不公开,导致某些开发不是很方便。而实时嵌入式操作系统μC/OS-II具有开放源码、研究免费的特点,而且μC/OS-II通过了FAA安全认证。文中通过实现一个嵌入式系统应用说明了μC/OS-II实时嵌入式操作系统在嵌入式系统中如何应用以及如何移植。     

基于μC/OS-Ⅱ的嵌入式系统的设计

嵌入式系统的应用正快速发展,而嵌入式系统的设计和嵌入式操作系统是其中的关键.由于大多数嵌入式操作系统价格昂贵、源码不公开,导致某些开发不是很方便.而实时嵌入式操作系统μC/OS-Ⅱ具有开放源码、研究免费的特点,而且μC/OS-Ⅱ通过了FAA安全认证.文中通过实现一个嵌入式系统应用说明了μC/OS-Ⅱ实时嵌入式操作系统在嵌入式系统中如何应用以及如何移植.     

嵌入式实时数据库管理系统的设计

在嵌入式实时环境中,传统的数据库已经不能满足人们对数据处理实时的需求;而一般的嵌入式实时数据库由于受资源的限制只能偏向于某个应用,不能满足嵌入式环境复杂多变的情况。因此,介绍了一个基于QNX操作系统设计出来的基于组件的嵌入式实时数据库管理系统,讨论了该数据库如何实现事务的实时处理策略,描述了该系统的开发过程和现有的功能属性。     

嵌入式Linux无线专网节点设备的设计与实现

在简述无线网络系统构架和嵌入式系统一般设计方法的基础上,提出了一种基于嵌入式Linux系统的新颖无线专网,并论述了网络系统的设计过程与实现方法。首先讨论了如何根据系统要求进行硬件设计,然后就系统设计、系统引导程序、无线网络路由协议等关键技术难点作了详细论述,提出了相应问题的实际可行解决方法,最后简述了系统的应用前景。     

基于SOA的电子政务系统研究

SCA是目前实现SOA构架的新技术.通过研究当代SOA特征及其实现技术,并针对当代SOA技术标准提出了基于SCA和BPEL的SOA解决方案.该构架实现业务组件的虚拟化,消除了服务集成的障碍,为在电子政务系统中的服务集成应用提供了新的思路.     

基于μC／OS-Ⅱ的嵌入式系统的设计

嵌入式系统的应用正快速发展，而嵌入式系统的设计和嵌入式操作系统是其中的关键。由于大多数嵌入式操作系统价格昂贵、源码不公开，导致某些开发不是很方便。而实时嵌入式操作系统μC／OS-Ⅱ具有开放源码、研究免费的特点，而且μC／OS-Ⅱ通过了FAA安全认证。文中通过实现一个嵌入式系统应用说明了μC／OS-Ⅱ实时嵌入式操作系统在嵌入式系统中如何应用以及如何移植。     

基于SOA的邮政物流信息系统规划

研究利用SOA技术思想和体系结构,设计基于SOA的邮政物流信息系统规划方案,介绍SOA的概念及体系架构优点,分析邮政物流信息系统现状存在的问题,提出基于SOA的邮政物流信息系统规划设计思想,给出基于SOA的总体构架,并对该体系下的主要构建模块和业务流程服务功能进行了阐述.     

物联网技术在城市垃圾清运监管系统中的应用研究

大型城市垃圾清运监管和费用收入清算是一种综合性技术集成应用系统,随着城市规模不断拓展这种应用需求显得更为迫切。基于物联网和计算机信息化管理应用技术,根据大型城市垃圾清运监管和费用清算的实际需求,设计和描述一种采用RFID射频、无线通信和嵌入式系统等应用技术,结合B/S构架应用模式的城市垃圾运输车辆智能监管系统的软件构架,包括该系统的构架模式、功能分解和软件模块结构。实际应用表明,该系统运行可靠、安全、易修改,达到了设计预期目标。     

ARMADA Middleware and Communication Services

Real-time embedded systems have evolved during the past several decades from small custom-designed digital hardware to large distributed processing systems. As these systems become more complex, their interoperability, evolvability and cost-effectiveness requirements motivate the use of commercial-off-the-shelf components. This raises the challenge of constructing dependable and predictable real-time services for application developers on top of the inexpensive hardware and software components which has minimal support for timeliness and dependability guarantees. We are addressing this challenge in the ARMADA project.ARMADA is set of communication and middleware services that provide support for fault-tolerance and end-to-end guarantees for embedded real-time distributed applications. Since real-time performance of such applications depends heavily on the communication subsystem, the first thrust of the project is to develop a predictable communication service and architecture to ensure QoS-sensitive message delivery. Fault-tolerance is of paramount importance to embedded safety-critical systems. In its second thrust, ARMADA aims to offload the complexity of developing fault-tolerant applications from the application programmer by focusing on a collection of modular, composable middleware for fault-tolerant group communication and replication under timing constraints. Finally, we develop tools for testing and validating the behavior of our services. We give an overview of the ARMADA project, describing the architecture and presenting its implementation status.     

Boosting the Robustness of Controller Area Networks: CANcentrate and ReCANcentrate

This paper discusses two proposed star architectures for systems based on the controller area network (CAN) protocol aim to improve CAN's error containment and fault tolerance for general distributed embedded systems and safety-critical applications.     

A configurable cryptography subsystem in a middleware framework for embedded systems

Computer and network security is becoming increasingly important as both large systems and, increasingly small, embedded systems are networked. Middleware frameworks aid the system developer who must interconnect individual systems into larger interconnected, distributed systems. However, there exist very few middleware frameworks that have been designed for use with embedded systems, which constitute the vast majority of CPUs produced each year, and none offer the range of security mechanisms required by the wide range of embedded system applications. This paper describes MicroQoSCORBA, a highly configurable middleware framework for embedded systems, and its security subsystem. It first presents an analysis of security requirements for embedded applications and what can and should be done in middleware. It then presents the design of MicroQoSCORBA’s security subsystem and the wide range of mechanisms it supports. Experimental results for these mechanisms are presented for two different embedded systems and one desktop computer that collectively represent a wide range of computational capabilities.     

Resource conscious development of middleware for control environments: a case of CORBA-based middleware for the CAN bus systems

While it is imperative to exploit middleware technologies in developing software for distributed embedded control systems, it is also necessary to tailor them to meet the stringent resource constraints and performance requirements of embedded control systems. In this paper, we propose a CORBA-based middleware for Controller Area Network (CAN) bus systems. Our design goals are to reduce the memory footprint and remote method invocation overhead of the middleware and make it support group communication that is often needed in embedded control systems. To achieve these, we develop a transport protocol on the CAN and a group communication scheme based on the publisher/subscriber model by realizing subject-based addressing that utilizes the message filtering mechanism of the CAN. We also customize the method invocation and message passing protocol of CORBA so that CORBA method invocations are efficiently serviced on a low-bandwidth network such as the CAN. This customization includes packed data encoding and variable-length integer encoding for compact representation of IDL data types.We have implemented our CORBA-based middleware using GNU ORBit. We report on the memory footprint and method invocation latency of our implementation.     

基于ARM的嵌入式RFID中间件设计与实现

RFID中间件通常被认为是RFID系统的中枢神经.本文借助于嵌入式ARM硬件平台和Linux操作系统,设计并实现了一种轻量级ALE的嵌入式RFID中间件.该中间件在保留了EPCglobalALE标准的主要功能,使之在保持与ALE标准最大程度兼容的前提下,取消和改进了ALE标准中的一些扩展性机制.所设计的中间件功能齐全、...     

QoS中间件中实时发布/订阅服务集成评估

支持QoS的中间件技术在构造分布式实时嵌入式系统中得到了广泛应用,已成为支持实时发布/订阅服务的关键技术.评估并分析了QoS中间件中3种集成实时发布/订阅服务方法.重点研究了容器管理方式的性能,并与面向对象的实时发布/订阅服务比较.研究结果表明,容器管理方式中,CIAO中间件的等待时间稍长,有可预测性,适用于DRE系统.     

Managing complexity: middleware explained

Traditionally, most definitions seeking to characterize middleware suggest that it is the software that facilitates remote database access and systems transactions. More recently, the term has come to be associated-somewhat limitingly-with distributed platforms such as the Open Software Foundation's Distributed Computing Environment (DCE) and the Object Management Group's Common Object Request Broker Architecture (CORBA). And some have loosely applied it to systems as diverse as workflow support environments and even to the Web itself. We believe the essential role of middleware is to manage the complexity and heterogeneity of distributed infrastructures and thereby provide a simpler programming environment for distributed-application developers. It is therefore most useful to define middleware as any software layer that is placed above the distributed system's infrastructure-the network OS and APIs-and below the application layer     

Foundations of a new software engineering method for real-time systems

The design of a fault-tolerant distributed, real-time, embedded system with safety-critical concerns requires the use of formal languages. In this paper, we present the foundations of a new software engineering method for real-time systems that enables the integration of semiformal and formal notations. This new software engineering method is mostly based upon the ”COntinuuM” co-modeling methodology that we have used to integrate architecture models of real-time systems (Perseil and Pautet in 12th International conference on engineering of complex computer systems, ICECCS, IEEE Computer Society, Auckland, pp 371–376, 2007) (so we call it “Method C”), and a model-driven development process (ISBN 978-0-387-39361-2 in: From model-driven design to resource management for distributed embedded systems, Springer, chap. MDE benefits for distributed, real time and embedded systems, 2006). The method will be tested in the design and development of integrated modular avionics (IMA) frameworks, with DO178, DO254, DO297, and MILS-CC requirements.