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Quality of service Composition and Adaptability of Software Architectures

Quality of Service Composition and Adaptability of Software ...

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international symposium on object-oriented real-time distributed computing

作者： Javier F. Briones Miguel A. de Miguel A. Alonso Juan Pedro Silva Universidad Politécnica de Madrid Spain

Quality of service adaptability refers to the ability of components/services to adapt in run-time the quality exhibited. A composition study from a quality point of view would investigate how these adaptable elements could be combined to meet systempsilas quality requirements. Enclosing quality properties with architectural models has been typically used to improve system understanding. Nevertheless these properties along with some supplementary information about quality adaptation would allow us to carry out a composition study during the design phase and even to predict some features of the adaptability behavior of the system. Existing modeling languages and tools lack enough mechanisms to cope with adaptability, e.g. to describe system elements that may offer/require several quality levels. This paper shows how we reuse existing modeling languages and tools, combine them and create new ones to tackle the problem of quality of service adaptability and composition. The final goal of this work is to evaluate architectural models to predict systempsilas QoS behavior before it is implemented.

关键词： Quality of service Software architecture Streaming media Runtime distributed computing Predictive models Adaptation model Teleconferencing Current measurement Charge measurement

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Proceedings: 11th ieee symposium on object/component/service-oriented real-time distributed computing, ISORC 2008

Proceedings: 11th IEEE Symposium on Object/Component/Service...

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11th ieee symposium on object/component/service-oriented real-time distributed computing, ISORC 2008

ISBN: (纸本)9780769531328

The proceedings contain 77 papers. The topics discussed include: the complexity challenge in embedded system design;a methodology for performance modeling of distributed event-based systems;energy-efficient optimal real-time scheduling on multiprocessors;service-oriented integration of systems for military capability;solutions for supporting composition of service-based real-time applications;a framework for extrusion detection using machine learning;realization of an adaptive distributed sound system based on global-time-based coordination and listener localization;evaluating the correctness and effectiveness of a middleware QoS configuration process in distributed real-time and embedded systems;a flexible trust model for distributed service infrastructures;examinating task distribution by an artificial hormone system based middleware;and scenario based evaluation.

关键词： Quality of service

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A Lightweight Anomaly Detection System for Information Appliances

A Lightweight Anomaly Detection System for Information Appli...

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international symposium on object-oriented real-time distributed computing

作者： Midori Sugaya Yuki Ohno Andrej van der Zee Tatsuo Nakajima Dependable Embedded OS Center Japan Science and Technology Agency Tokyo Japan School of Science and Engineering Waseda University Tokyo Japan

In this paper, a novel lightweight anomaly and fault detection infrastructure called anomaly detection by resource monitoring (Ayaka) is presented for information appliances. Ayaka provides a general monitoring method for detecting anomalies using only resource usage information on systems independent of its domain, target application, and programming languages. Ayaka modifies the kernel to detect faults and uses a completely application black-box approach based on machine learning methods. It uses the clustering method to quantize the resource usage vector data and learn the normal patterns with a hidden Markov Model. In the running phase, Ayaka finds anomalies by comparing the application resource usage with the learned model. The evaluation experiment indicates that our prototype system is able to detect anomalies, such as SQL injection and buffer overrun, without significant overheads.

关键词： Home appliances Fault detection Application software Computer languages Microcomputers Hardware Embedded system object detection Monitoring Clustering methods

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Adding Timing-Awareness to AUTOSAR Basic-Software -- A component Based Approach

Adding Timing-Awareness to AUTOSAR Basic-Software -- A Compo...

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international symposium on object-oriented real-time distributed computing

作者： Dietmar Schreiner Markus Schordan Jens Knoop Institute of Computer Languages University of Technology Vienna Vienna Austria Institute of Computer Science University of Applied Sciences Technikum Vienna Vienna Austria

AUTOSAR as specified in its current version fosters timing-constraints at application level to support the development of real-time automotive applications. However, the standard's actual specification does not consider any timing information for its basic software. In consequence, the over-all timing-behavior of software running at a specific system node can not be calculated and thus validated at development-time. Even worse, any exchange or modification of basic software modules induces unpredictable alteration in system timing, and may even lead to a severe miss of execution deadlines. Within this paper we solve this issue by using a component based basic software architecture, as much as timing-aware software composition for basic software components. We therefore introduce timing contracts as enhancement for existing interface contracts, specify a timing annotation language on a conceptual level, and demonstrate how to capitalize on our approach by calculating timings within composed basic software architectures at development time.

关键词： Contracts Timing Application software Automotive engineering component architectures Automotive applications Software architecture Standards development Costs Automotive electronics

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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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international symposium on object-oriented real-time distributed computing

作者： Kane Kim Qian Zhou Jing Qian Kyung-Deok Moon Jun Hee Park Young-Sung Son Chang-Eun Lee Tai-Yeon Ku EECS Department & DREAM Laboratory University of California Irvine CA USA Electronics and Telecommnications Research Institute Daejeon South Korea

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： Fault tolerance Home automation Middleware Fault detection object oriented modeling Engines distributed computing Spine Skeleton Information management

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Towards Configurable real-time Hybrid Structural Testing: A Cyber-Physical System Approach

Towards Configurable Real-Time Hybrid Structural Testing: A ...

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international symposium on object-oriented real-time distributed computing

作者： Terry Tidwell Xiuyu Gao Huang-Ming Huang Chenyang Lu Shirley Dyke Christopher Gill Department of Computer Science and Engineering Washington University Saint Louis MO USA Department of Mechanical Aerospace and Structural Engineering Washington University Saint Louis MO USA

real-time hybrid testing of civil structures represents a grand challenge in the emerging area of cyber-physical systems. Hybrid testing improves significantly on either purely numerical or purely empirical approaches by integrating physical structural components and computational models. Actuator dynamics, complex interactions among computers and physical components, and computation and communication delays all hamper the ability to conduct accurate tests. To address these challenges, this paper presents initial work towards a Cyber-physical Instrument for real-time hybrid Structural Testing (CIRST). CIRST aims to provide two salient features: a highly configurable architecture for integrating computers and physical components; and system support for real-time operations in distributed hybrid testing. This paper presents the motivation of the CIRST architecture and preliminary test results from a proof-of-concept implementation that integrates a simple structural element and simulation model. CIRST will have broad impacts on the fields of both civil engineering and real-time *** will enable high-fidelity real-time hybrid testing of a wide range of civil infrastructures, and will also provide a high-impact cyber-physical application for the study and evaluation of real-time middleware.

关键词： real time systems System testing Physics computing Computational modeling Computer architecture Actuators Delay Instruments distributed computing Civil engineering

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component Based Middleware-Synthesis for AUTOSAR Basic Software

Component Based Middleware-Synthesis for AUTOSAR Basic Softw...

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international symposium on object-oriented real-time distributed computing

作者： Dietmar Schreiner Markus Schordan Karl M. Goschka University of Technology Vienna Vienna Austria Institute of Computer Science University of Applied Sciences Technikum Vienna Vienna Austria

distributed real-time automotive embedded systems have to be highly dependable as well as cost-efficient due to the large number of manufactured units. To close the gap between raising complexity and cutting costs, upcoming software standards like AUTOSAR introduce a clear separation of concerns into their system architecture. An AUTOSAR application is built from components that deal with business logic only whereas infrastructural services are provided by standardized middleware. Unfortunately, this middleware tends to be heavy-weight due to its coarse-grained layered design. By applying a component based design to AUTOSAR's middleware, a custom-tailored version for each specific application and system node can be built to overcome this problem. This paper demonstrates how to automatically synthesize component based middleware via the connector transformation: component connectors in platform independent application models are utilized to automatically assemble platform- and application specific middleware. As a result, AUTOSAR middleware becomes custom-tailored and hence light-weight and flexible. In addition, the described synthesis algorithm is capable of incorporating timing annotations via interface contracts at model level, and thus reflects upcoming ambitions to cover real-time constraints at middleware level within AUTOSAR. To prove our approach we successfully synthesized middleware for a demonstrator application and compared it to its conventional counterpart.

关键词： Middleware Connectors real time systems Automotive engineering Embedded system Manufacturing Costs Software standards Computer architecture Application software

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Multimedia Chat for Helpdesks: A Requirements Study, a Practical SOA Architecture, and an Interface Prototype

Multimedia Chat for Helpdesks: A Requirements Study, a Pract...

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international symposium on object-oriented real-time distributed computing

作者： Zon-Yin Shae Tony Bergstrom Claudio Pinhanez Mark Podlaseck IBM Thomas J. Watson Research Center USA Department of Computer Science University of Illinois Urbana-Champaign USA

In this work we study the actual requirements of a multimedia chat system for helpdesks by quantifying the verbal imagery communication in 115 real transcripts. The data shows that in chats which use verbal imagery, it corresponds to about 25% of the total time, most of it (75%) coming from the agent. These results clearly show that multimedia support for contact center chat systems is called for. But unlike in personal chat systems, the existing 3 rd party chat services for helpdesk centers are text-based only. To circumvent this issue, an innovative, practical SOA-based chat system architecture is proposed in this paper that creates multimedia chat services by decomposition and re-composition of the services from an existing 3 rd party text-based helpdesk chat product. Our SOA architecture implements uniquely a session-based interactive mash up mechanism and bundles it to the previous operations in the same chat session. However, to be effective in the context of technical support, a multimedia chat system must be provided with user and agent interfaces which address the distinctive aspects of technical support communication and imagery use in the conversations. We present an interface prototype that address those issues through the use of persistent imagery, linking instructions and imagery, use of common images,and easy screen sharing.

关键词： Semiconductor optical amplifiers Prototypes Multimedia systems service oriented architecture Context Image converters Vocabulary Ground support Costs distributed computing

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Compensating for Timing Jitter in computing Systems with General-Purpose Operating Systems

Compensating for Timing Jitter in Computing Systems with Gen...

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international symposium on object-oriented real-time distributed computing

作者： Abhishek Dubey Gabor Karsai Sherif Abdelwahed Institute of Software Integrated Systems Vanderbilt University Nashville TN USA Electrical Engineering and Computer Science Mississippi State University MS USA

ISBN: (纸本)9781424435715

Fault-tolerant frameworks for large scale computing clusters require sensor programs, which are executed periodically to facilitate performance and fault management. By construction, these clusters use general purpose operating systems such as Linux that are built for best average case performance and do not provide deterministic scheduling guarantees. Consequently, periodic applications show jitter in execution times relative to the expected execution time. Obtaining a deterministic schedule for periodic tasks in general purpose operating systems is difficult without using kernel-level modifications such as RTAI and RTLinux. However, due to performance and administrative issues kernel modification cannot be used in all scenarios. In this paper, we address the problem of jitter compensation for periodic tasks that cannot rely on modifying the operating system kernel. ; Towards that, (a) we present motivating examples; (b) we present a feedback controller based approach that runs in the user space and actively compensates periodic schedule based on past jitter; This approach is platform-agnostic i.e. it can be used in different operating systems without modification; and (c) we show through analysis and experiments that this approach is platform-agnostic i.e. it can be used in different operating systems without modification and also that it maintains a stable system with bounded total jitter.

关键词： Timing jitter Operating systems real time systems distributed computing Control systems Linux Kernel Processor scheduling Sleep Adaptive control

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Robust Mesh-Based Data Delivery over Multiple Tree-Shaped Routes in P2P Overlay Network

Robust Mesh-Based Data Delivery over Multiple Tree-Shaped Ro...

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international symposium on object-oriented real-time distributed computing

作者： Suphakit Awiphan Su Zhou Jiro Katto Graduate School of Science and Engineering Waseda University Shinjuku Tokyo Japan

In this paper, we introduce a new mesh-based approach for data delivery which is organized over multiple tree-shaped core routes. Given that both tree and mesh approaches for multicast overlay construction have their own strong points, we simply combine them. During session, the mesh connections are formed dynamically to facilitate the data delivery on tree-shaped core routes which may experience bandwidth bottlenecks. Unlike existing mesh-based approaches, our proposal employs push-based data delivery along mesh connection. A well-organized mesh construction scheme is defined to avoid data redundancies. We evaluated the proposal through ns-2 simulator. The simulation results demonstrate that our approach can provide higher average received quality and has acceptable control overhead when compared to a single tree method. We also show that, over a static overlay, the push-based data delivery on mesh can provide the received quality close to supposed pull-based data delivery method with less latency. Moreover, it has lower control overhead than the pull-based method when the peer number is large.

关键词： Robustness Peer to peer computing Proposals Bandwidth Delay Application software distributed computing Data engineering Robust control Collaboration

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