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4th IEEE international symposium on object-oriented real-time computing (ISORC 2001)

作者： Yoon, HS Han, H Kim, YK Jin, SI Chungnam Natl Univ Dept Comp Sci Taejon 305764 South Korea

ISBN: (纸本)0769510892

MMDB(Main Memory-resident DataBase) systems have been used for real-time applications, such as a stock market and an auction system, which require fast response time and predictable behavior. However, most existing MMDB systems do not support active functionalities. Also, the trigger capability which is specified in SQL3 and implemented in some conventional DBMSs provides only an extremely limited form of active functions. This paper proposes a scheme to add active capabilities to existing MMDB without modifying the kernel. Generally, active functions can be classified into event-triggered active functions, such as decision of buying or selling point according to the state of database, and time-triggered active functions, such as periodic updates of stock prices, which are frequently used in real-time applications. The proposed scheme is designed to provide both kinds of active functions for MMDB by putting a time manager which checks an absolute time for a time trigger and an SQL processing module which provides an event trigger.

关键词： Financial markets

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distributed object-oriented real-time simulation of the multicast protocol RFRM 7

Distributed object-oriented real-time simulation of the mult...

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7th IEEE international Workshop on object-oriented real-time Dependable Systems (WORDS 2002)

作者： Hong, YS Dongguk Univ Seoul South Korea

ISBN: (纸本)0769515762

A real-time fault-tolerant multicast protocol is necessary for obtaining high performance in operating distributed real-time computing systems. The purpose of this paper is to show the efficiency of RFRM (Release-time based Fault-tolerant real-time Multicast) protocol which is based on the idea of attaching the official release time to each multicast message. As a part of this, a real-time simulation based on the TMO structuring scheme is conducted to evaluate the proposed approach. We experiment a real-time multicast model which does not receive ack-messages toward reducing the message traffic on the network by employing fault detection mechanism. Simulation results promised the efficiency of the proposed real-time multicast protocol.

关键词： real time multicast protocol fault tolerance acknowledgement official release time simulation TMO distributed parallel object

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object-oriented multitasking control environment for multirobot system programming and execution with 3D graphic simulation

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international Journal of Production Economics 1999年第0期60卷 241-250页

作者： Yasuda, Gen'ichi Department of Mechanical Engineering Faculty of Engineering Nagasaki Inst. of Applied Science 536 Aba-machi Nagasaki 851-01 Japan

This paper describes an object-oriented distributed control environment for industrial multirobot applications. A distributed computing environment, where workpieces, robots, and other industrial devices such as a vision sensor are defined as software objects with class inheritance hierarchy, supports human-friendly task-level programming and automated robot program generation with 3D graphic simulation, and performs supervisory and real-time sensor-based coordinated control of multirobot systems. Using object-oriented multitasking control with a preemptive rescheduler, vision-based robot positioning and pick and place operations for exchange of a workpiece are demonstrated to validate the control performance of the computing environment.

关键词： object oriented programming

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real-time tasks scheduling with value control to predict timing faults during overload

Real-time tasks scheduling with <i>value</i> control to pred...

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10th IEEE international symposium on object and Component-oriented real-time distributed computing

作者： Tres, Crineu Becker, Leandro Buss Nett, Edgar Univ Fed Santa Catarina Automat & Syst Dept Florianopolis SC Brazil Otto Von Guericke Univ Inst Distributed Syst IVS Magdeburg Germany

ISBN: (纸本)9780769527659

Modern real-time applications are very dynamic and cannot cope with the use of worst case execution time to avoid overload situations. Therefore scheduling algorithms that are able to prevent timing faults during overload are required. In this context, the value parameter has become useful to add generality and flexibility to such systems. In this paper we present the scheduling algorithm called DMB (Dynamic Misses Based), which is capable of dynamically changing tasks value in order to adjust their importance according to its timing faults rate. The main goal of DMB is to allow the prediction of timing faults during overloads and thereby support a dynamic tuning of tasks fault rate. It is used to enhance the features of the previously defined TAFT (time-Aware Fault-Tolerant) scheduler Obtained results show that DMB in conjunction with TAFT reached the most promising results during overloads, allowing to control tasks degradation in a graceful and determined way.

关键词： Scheduling

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An adaptive middleware for context-sensitive communications for real-time applications in ubiquitous computing environments

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real-time SYSTEMS 2004年第1期26卷 29-61页

作者： Yau, SS Karim, F Arizona State Univ Dept Comp Sci & Engn Tempe AZ 85287 USA Intel Corp Hillsboro OR 97124 USA

Context-sensitivity is an important expected capability in applications in ubiquitous computing (ubicomp) environments. These applications need to use different contextual information from the user, host device, on board sensors, network, and the ambient environments to systematically adapt their actions. In addition, some context-sensitive applications may use specific contextual conditions to trigger impromptu and possibly short-lived interactions with applications in other devices. This property, referred to as context-sensitive or context-aware communications, allows applications to form short-range mobile ad hoc networks consisting of mobile and stationary devices, sensors, and other computing resources. real-time applications, especially those having reactive behavior, running on embedded devices and requiring context-sensitive communications support, pose new challenges related to systematic representation of specific contexts, associations of contexts with real-time actions, timely context data collection and propagation, and transparent context-sensitive connection establishment. An object-based middleware can be effective to meet these challenges if such a middleware can provide a well-defined development framework as well as lightweight runtime services. In this paper, an adaptive and object-based middleware, called reconfigurable context-sensitive middleware (RCSM) is presented to facilitate context-sensitive communications in ubicomp environments. To facilitates context-sensitive communications, RCSM provides a context-aware interface definition language for specifying context-sensitive interfaces of real-time objects, an object container framework for generating interfaces-specific context-analyzers, and a context-sensitive object request broker for context-sensitive object discovery and impromptu connection management. RCSM is adaptive in the sense that depending on the context-sensitive behavior of the applications, it adapts its object discovery and

关键词： reconfigurable context-sensitive middleware ubiquitous computing environments real-time context-sensitive applications context-sensitive communication context-sensitive object discovery adaptive middleware mobile ad hoc networks object-based middleware context-sensitive object request broker

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realization of an Adaptive distributed Sound System based on global-time-based coordination and listener localization

Realization of an Adaptive Distributed Sound System based on...

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11th IEEE symposium on object/Component/Service-oriented real-time distributed computing

作者： Henrich, Emmanuel Colmenares, Juan A. Fujiwara, Keizo Im, Chansik (Kane) Kim, K. H. Zheng, Liangchen Panasonic Avionics Corporation United States UC Irvine United States Microsoft Japan Intel Corporation United States Applied Computing Institute School of Engineering University of Zulia

ISBN: (纸本)9780769531328

This paper discusses the benefits of exploiting 1) the principle of global-time-based coordination of distributed computing actions (TCoDA) and 2) a high-level component-/object-based programming approach in developing real-time embedded computing software. The benefits are discussed in the context of a concrete case study. A new major type of distributed multimedia processing applications, called Adaptive distributed Sound Systems (ADSSs), is presented here to show the compelling nature of the TCoDA exploitation. High-quality ADSSs impose stringent real-time distributed computing requirements. They require a global-time base with precision better than 100 mu s. For efficient implementation, the TMO programming scheme and associated tools are shown to be highly useful. In addition, a prototype TMO-based ADSS has been developed and its most important quality attributes have been empirically evaluated. The prototype ADSS has also turned out to be a cost-effective tool for assessing the quality of service of a TMO execution engine.

关键词： TCoDA TMO real-time multimedia global time quality of service distributed computing synchronous playback software components

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XML profile for distributed real time systems

XML profile for distributed real time systems

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11th IEEE symposium on object/Component/Service-oriented real-time distributed computing

作者： Poon, Polly M. Dillon, Tharam S. Chang, Elizabeth Feng, Ling UTS Fac Informat Technol Sydney NSW Australia Curtin Univ Technol Digital Ecosyst & Business Intelligence Inst Perth WA Australia Tsinghua Univ Dept Comp Sci & Technol Database Grp Beijing 100084 Peoples R China

ISBN: (纸本)9780769531328

In this paper, we describe a XML based profile for modeling the semantics of real time systems. We aim to use real time Markup Language (RTML) to provide a comprehensive description of temporal properties for the use in distributed systems communication. RTML is derived from a number of specifications including OMG UML Profile in Schedulability, Performance, and time. In this paper, we discuss the technique that was used to develop RTML semantic model and the important concepts in RTML.

关键词： XML

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NetMars: Next-generation digital image library system 3

NetMars: Next-generation digital image library system

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3rd IEEE international symposium on object-oriented real-time distributed computing, ISORC 2000

作者： Nagasawa, H. Omori, N. Nishino, M. Res. and Dev. Center NTT EAST Japan

ISBN: (纸本)0769506070

A next generation digital image library system called NetMars has been developed. This system enables moving pictures on the network to be retrieved and viewed, and provides simple compiling functions for rearranging retrieved moving pictures. With NetMars, specific proposals are made for copyright processing, focusing on secondary usage as a new method for distributing video contents. NetMars applies CORBA based object oriented technology in a distributed processing environment. It emphasizes mutual interconnectivity and provides a mechanism for the issuing, distribution, and sharing of information among image libraries existing on multiple networks. © 2000 IEEE.

关键词： Common object request broker architecture (CORBA)

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realization of Fault-Tolerant Home Network Management Middleware with the TMO Structuring Approach and an Integration of Fault Detection and Reconfiguration Mechanisms

Realization of Fault-Tolerant Home Network Management Middle...

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IEEE international symposium on object/Component/Service-oriented real-time distributed computing

作者： Kim, K. H. (Kane) Zhou, Qian Qian, Jing Moon, Kyung-Deok Park, Jun Hee Son, Young-Sung Lee, Chang-Eun Ku, Tai-Yeon Univ Calif Irvine Dept EECS Irvine CA 92697 USA Elect & Telecom Res Inst Daejeon South Korea

ISBN: (纸本)9780769535739

A middleware model named ROAFTS (real-time object-oriented Adaptive Fault Tolerance Support) has been evolving in the UCI DREAM Lab. over the past decade as the core of a reliable execution engine model for fault-tolerant (FT) real-time (RT) distributed computing (DC) applications. It is meant to be an integration of various mechanisms for fault detection and recovery in a form that meshes well with high-level RT DC object/component-based programming, in particular, TMO (time-triggered Message-triggered object) programming. Using ROAFTS as a backbone and low-layer middleware, we developed a model and a skeleton implementation for FT DC middleware providing efficient FT execution services for component-based home network applications. Capabilities for management of home information processing devices, including health monitoring of home devices, reconfiguration of device connections, and servicing queries on device status, were added to ROAFTS. Those additions were first designed as a network of high-level RT DC components, i.e., TMOs. Then the TMO network was extended into an FT TMO network by applying the replication scheme called the PSTR (Primary-Shadow TMO Replication) scheme and incorporating a component responsible for reconfiguring TMO replicas. This extension of ROAFTS is called ROAFTS-HNE (Home Network Extension) and its architecture is presented here. In addition, during the development of the ROAFTS-HNE model, we formulated a new approach for applying the PSTR scheme to RT DC components supported by ROAFTS. Finally, evaluations of the recovery times of a prototype implementation have been conducted.

关键词： home network fault tolerance fault detection object replication ROAFTS PSTR template reconfiguration TMO real-time TNCM SNS RMP RSMPSM UMB

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MRBAC: Hierarchical role management and security access control for distributed multimedia systems

MRBAC: Hierarchical role management and security access cont...

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11th IEEE symposium on object/Component/Service-oriented real-time distributed computing

作者： Zhao, Na Chen, Min Chen, Shu-Ching Shyu, Mei-Ling Florida Int Univ Sch Comp & Informat Sci Distributed Multimedia Informat Syst Lab Miami FL 33199 USA Univ Montana Dept Comp Sci Missoula MT 59812 USA Miami Univ Dept Elecrt & Comp Engn Oxford OH 45056 USA

ISBN: (纸本)9780769531328

In this paper, a Role-based Access Control (RBAC) model is applied and extended to a multimedia version called Multi-Role Based Access Control (MRBAC), which can fully support the comprehensive and multilevel security control requirements of the distributed multimedia applications. The object-oriented concept is adopted in MRBAC to perform the hybrid role hierarchy management and security roles and rules administration. In summary, MRBAC can: 1) support the multi-level security protection for multimedia data;2) provide access control by checking both the time constrains and IP addresses;and 3) decentralize the administration functions to make the access control management more efficient.

关键词： Access control

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