A real-time responsiveness measurement method of linux-based mobile systems for P2P cloud systems

Linux-based mobile computing systems such as robots, electronic control devices, and smart-phone are the most important types of P2P cloud systems in recent days. To improve the overall performance of networked systems, each mobile computing system requires real-time characteristics. For this reason, mobile computing system developers want to know how well real-time responsiveness is supported; several real-time measurement tools have been proposed. However, those previous tools have their own measurement schemes and we think that the results from those models do not show how responsive those systems are. In this paper, we propose ELRM, a new real-time measurement method that has clear measurement interval definitions and an accurate measurement method for real-time responsiveness. We evaluate ELRM on various mobile computing systems and compare it with other existing models. As a result, our method can obtain more accurate and intuitive real-time responsiveness measurement results.     

A UML package for specifying real-time objects

The Unified Modeling Language (UML) provides a robust set of tools for modeling software systems. However, these tools do not directly address the requirements of real-time systems. Many real-time systems require the specification of data that has strict timing constraints. This paper presents a UML package for specifying real-time objects called RT-Object. The constructs in the package are based on the objects of the Real-Time Semantic Objects Relationships And Constraints (RTSORAC) model. The RT-Object package has been used to design real-time objects in a Real-Time Multi-User Virtual Environment (RTMUVE), in which widely distributed users collaborate in time-critical planning and decision making.     

实时网络安全监控系统的设计和实现

提出了一种实时网络安全监控系统(Real-time Network Security Monitoring System，RNSMS)，讨论了RNSMS的工作模式、实现功能、关键技术等问题。RNSMS能实时地对网络活动进行监控，对常见网络数据包(HTTP，FTP，Tclnet，POP，SMTP，SSL，UDP)内容进行实时分析还原，并加入OPSEC接口，加强与其他网络安全工具的协作互动。应用表明RNSMS是一种有效的网络安全工具。     

GPU-based point radiation for interactive volume sculpting and segmentation

Internal structures, features, and properties in volumetric datasets are mostly obscured and hidden. In order to reveal and explore them, appropriate tools are required to remove and carve the occluding materials and isolate and extract different regions of interest. We introduce a framework of interactive tools for real-time volume sculpting and segmentation. We utilize a GPU-based point radiation technique as a fundamental building block to create a collection of high-quality volume manipulation tools for direct drilling, lasering, peeling, and cutting/pasting. In addition, we enable interactive parallel region growing segmentation that allows multiple seed planting by direct sketching on different volumetric regions with segmentation results dynamically modified during the process. We use the same point radiation technique to create high-quality real-time feedback of the segmented regions during the seed growing process. We present results obtained from raw and segmented medical volume datasets.     

Experimental evaluation of software development tools for safety-critical real-time systems

Since the early years of computing, programmers, systems analysts, and software engineers have sought ways to improve development process efficiency. Software development tools are programs that help developers create other programs and automate mundane operations while bringing the level of abstraction closer to the application engineer. In practice, software development tools have been in wide use among safety-critical system developers. Typical application areas include space, aviation, automotive, nuclear, railroad, medical, and military. While their use is widespread in safety-critical systems, the tools do not always assure the safe behavior of their respective products. This study examines the assumptions, practices, and criteria for assessing software development tools for building safety-critical real-time systems. Experiments were designed for an avionics testbed and conducted on six industry-strength tools to assess their functionality, usability, efficiency, and traceability. The results some light on possible improvements in the tool evaluation process that can lead to potential tool qualification for safety-critical real-time systems.     

Real-time Java has become already real

Enhanced complexity of the designed real-time computer systems requires that the developers seek for efficient methods and tools to solve the posed problems. The most obvious and simple approach is to employ technologies that have demonstrated their applicability; such technologies should be adapted to the requirements of mission-critical systems. This paper is dedicated to specific features in real-time Java technology. They are considered simultaneously with characteristics of real-time computer systems.     

UM-RTCOM: An analyzable component model for real-time distributed systems

Component-based development is a key technology in the development of software for modern real-time systems. However, standard component models and tools are not suitable for this type of system, since they do not explicitly address real time, memory or cost constraints. This paper presents a new predictable component model for real-time systems (UM-RTCOM) together with a set of tools to support it. The environment allows new components to be developed which can then be assembled to build complete applications, including hardware interaction. The model includes support for real-time analysis at the component and application level. The analysis is achieved by combining component meta-information in the form of an abstract behaviour model and a method to measure worst-case execution times in the final platform. Additionally, we propose an implementation model based on RT-CORBA where the developer uses the UM-RTCOM components and a set of tools to map these elements to elements of the desired platform. In order to apply our proposals, we have used the model and tools in real applications specifically in the context of nuclear power plant simulators.     

Problems with expert systems in real-time control

There is increasing use of knowledge-based or expert systems in the process and manufacturing industries, with currently in excess of 2000 installations. The advantage offered by such systems is their ability to deal with complex and possibly incorrect or incomplete data. A new generation of expert-system tools, designed specifically for real-time control applications, has been developed. This paper examines the requirements of an expert system for real-time control, and shows how current approaches attempt to meet them. It is argued that none of the currently available tools fully satisfy the needs of a real-time expert control system, particularly in terms of reliability and guaranteed real-time response.     

网络取证系统及工具分析

随着网络技术的发展,计算机网络犯罪总量持续上升,计算机取证工作显得越来越重要。计算机取证分为事后取证和实时取证。早期的实时取证所利用的网络安全工具在取证学角度都存在一定的局限性,它们所产生的数据不能成为法律意义上的证据。由此,网络取证系统应运而生,它对网络入侵事件、网络犯罪活动进行证据获取、保存、分析和还原,弥补了传统安全工具在实时取证中的不足。文中对网络取证系统进行了详细分析,并对目前的一些网络取证工具进行了比较。     

Design and Programming Tools for Time Critical Applications

The development of time critical applications needs specific tools able to cope with both functional and non-functional requirements. In this paper we describe a design and programming environment to assist the development of hard real-time applications. An interactive graphic interface is provided to facilitate the design of the application according to three hierarchical levels. The development model we propose is based on an iterative process in which the real-time scheduling support is considered from the beginning of the design phases.Our graphic environment integrates several tools to analyze, test, and simulate the real-time application under development. In particular, the tools we have implemented are: a Design Tool, to describe the structure of the application, a Schedulability Analyser Tool (SAT), to verify off-line the feasibility of the schedule of a critical task set, a Scheduling Simulator, to test the average behavior of the application, and a Maximum Execution Time (MET) estimator to bound the worst case duration of each task.     

Issues in Ada compiler technology

The key technical issues involved in producing high-quality Ada compilers and related support tools are discussed. These include real-time issues, programming tools and environments, and code optimization. Also addressed are some important problems that compiler designers face, for example, determining which deficiencies of existing Ada systems can be attributed to the language and which are simply hard-to-implement features or unresolved issued in Ada compiler technology     

面向物流服务的海量日志实时流处理平台

随着电商平台的快速发展,物流行业增长迅猛,其中物流服务平台的访问日志能够反映用户的行为规律,从而挖掘潜藏信息助力物流服务平台优化业务已至关重要.目前,针对于此类大规模日志数据处理提出了更高的实时性需求,本文综合考量多种实时计算的流处理框架、大规模存储数据库以及日志采集工具等,选取Flume及Kafka作为日志采集工具与消息队列,并利用Flink及HBase进行流数据实时计算以及大规模数据存储.同时,对平台设计了数据去重、异常告警、容错策略以及负载调度的功能.经实验测试证明,本处理平台可以有效处理物流服务平台的日志数据,具有较强的创新思路以及实际价值.     

基于ROA的移动个人知识管理系统集成

针对目前个人知识管理工具存在的功能单一以及实时性差等缺陷,提出基于智能化移动终端的、敏捷实时的个人知识管理体系结构.通过与传统基于SOA的Web服务进行比较,阐述基于ROA的Web服务在系统可扩展性、安全性及交互性等方面的优势.在此基础上,提出移动个人知识管理平台与现有第三方知识管理系统之间的集成方案,采用J2EE、JQUERY、RESTLET和ANDROID等开发环境搭建个人知识管理系统,给出异构知识管理平台之间相互集成的关键技术.     

Unix软件平台用于实时监控系统的研究

提出并讨论了Ｕｎｉｘ操作系统适用于监控系统的特点,并提出了对Ｕｎｉｘ进行实时化改造的方案以及对系统进行性能测试的工具,经过实时化改造后,Ｕｎｉｘ系统不失为实时监控系统的首选平台。     

神经信息实时处理平台的快速开发

针对神经信息处理过程中的高速实时、快速开发、多功能复杂算法实现等需求,对当前几种主流的硬件实时处理开发平台进行比较,并综述神经信息实时处理开发过程及知识产权(IP)核的快速开发方法.同时,对基于可编程片上系统的神经信息实时处理平台快速开发的需求从多平台连接、开发工具之间高效转换和标准化信息处理库三个方面进一步阐述,为神经信息实时处理快速开发的研究提供了参考.     

CASE: analysis and design tools

Computer-aided software engineering (CASE) tools are defined, and ten CASE tools are briefly overviewed. Individual presentations on the various tools follow. The focus is on structured analysis, design, and programming. Two of the tools (Cradle and JSP Workbench) are implementations of the Yourdon and Jackson methods for structured analysis, structured design, and programming; three tools (Time Bench, Card Tools, and Prosa) are for real-time systems development; four (Excelerator, Adagen, Smart System, and Software Through Pictures) are general-purpose front-end CASE tools and one (Virtual Software Factory) is a CASE tool for building CASE tools     

交叉开发环境中的目标机代理设计

当进行嵌入式应用开发时，需要利用宿主机开发环境中的多种工具，例如交叉编译器、远程调试器、命令解析器和实时资源浏览器。不同的主机端工具需要支持主机-目标机通信，并会产生许多不一致性，使得目标系统的设计变得相当复杂。该文提出了一种实现主机端工具与目标系统交互的通信机制，在自主嵌入式实时操作系统ReWorks中，设计开发了一个目标机代理。     

Real-time system = discrete system + clock variables

This paper introduces, gently but rigorously, the clock approach to real-time programming. We present with mathematical precision, assuming no prerequisites other than familiarity with logical and programming notations, the concepts that are necessary for understanding, writing, and executing clock programs. In keeping with an expository style, all references are clustered in bibliographic remarks at the end of each section. The first appendix presents proof rules for verifying temporal properties of clock programs. The second appendix points to selected literature on formal methods and tools for programming with clocks. In particular, the timed automaton, which is a finite-state machine equipped with clocks, has become a standard paradigm for real-time model checking; it underlies the tools HyTech, Kronos, and Uppaal, which are discussed elsewhere in this volume.