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distributed processes: A Concurrent Programming Concept

Communications of the ACM 1978年第11期21卷 934-941页

作者： Hansen, Per Brinch Computer Science Department University of Southern California Los Angeles CA 90007 United States

A language concept for concurrent processes without common variables is introduced. These processes communicate and synchronize by means of procedure calls and guarded regions. This concept is proposed for real-time applications controlled by microcomputer networks with distributed storage. The paper gives several examples of distributed processes and shows that they include procedures, coroutines, classes, monitors, processes, semaphores, buffers, path expressions, and input/output as special cases. © 1978, ACM. All rights reserved.

关键词： buffers classes concurrent programming coroutines distributed processes guarded regions input/output microprocessor networks monitors nondeterminism path expressions process communication and scheduling processes programming languages semaphores sorting arrays

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distributed filter processes

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2005年第12期17卷 1497-1506页

作者： Joshi, RK Indian Inst Technol Dept Comp Sci & Engn Bombay 400076 Maharashtra India

A programming model called distributed filter processes for transparent filtering in distributed systems is presented. Filter processes are modelled as extensions to distributed processes. Messages can be captured transparently by intermediate filter processes. The programming abstractions are presented with applications to the evolution of programs. Copyright (c) 2005 John Wiley & Sons, Ltd.

关键词： distributed processes dynamic evolution filter processes cooperative filters transparency

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Assistive devices and distributed processes: reflections on activity systems and impairments

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SCANDINAVIAN JOURNAL OF DISABILITY RESEARCH 2010年第4期12卷 305-319页

作者： Maseide, Per Grottland, Havar Bodo Univ Coll Fac Social Sci Bodo Norway

The article is based on an empirical research project involving persons with visual and hearing impairments and their use of assistive devices. The aim of the article is to develop a sociological understanding of the nature of assistive devices as impairments and disabilities are enacted within different everyday settings and mediated by tools and artefacts. Assistive devices include physical equipment, chemicals, animals, other persons, groups or organizations. They belong to different kinds that work at different levels of concreteness. The assistive devices mediate between the impaired body in the lived as well as the objective sense, and the material and socio-cultural environment through processes and types of activity. This takes place through what we term distributed physical and cognitive processes. These processes are constitutive for the practical understanding of assistive devices, impaired bodies and surroundings.

关键词： assistive devices distributed processes activity systems impairments

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distributed filter processes

Distributed filter processes

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11th Magdeburg Seminar on Waters in Central and Eastern Europe

作者： Joshi, RK Indian Inst Technol Dept Comp Sci & Engn Bombay 400076 Maharashtra India

关键词： distributed processes dynamic evolution filter processes cooperative filters transparency

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Location-aware business process modeling and execution

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SOFTWARE AND SYSTEMS MODELING 2025年第1期24卷 37-67页

作者： Poss, Leo Schoenig, Stefan Univ Regensburg Inst Microbiol Univ str 31 D-93053 Regensburg Bavaria Germany

Locally distributed processes include several process participants working on tasks at different locations, e.g., craftspeople working on construction sites. Compared to classical IT environments, new challenges emerge due to the spatial context of a process. Real-time location data from Internet of Things (IoT) devices can help businesses implement more efficient and effective processes through business process management (BPM). However, only small parts of existing research have touched on those advantages, while the architecture and implementation of actual executable location-aware processes area has only been vaguely considered. Therefore, we introduce and present a non-exhaustive list of patterns for using location data in BPM while also including an actual implementation of a location-aware approach using a multilayer system architecture based on standard BPM technology. These can be used to leverage the location perspective of process entities as contextual data in BPM.

关键词： Process execution Location-awareness distributed processes

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A formal mapping-based approach for distributed schedule coordination on projects

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ADVANCED ENGINEERING INFORMATICS 2009年第1期23卷 104-115页

作者： Siddiqui, Mohsin K. O'Brien, William J. Univ Texas Austin Dept Civil Environm & Architectural Engn Austin TX 78712 USA

Construction projects involve a large number of participants with overlapping scope of work. Coordination of their activities is usually an iterative manual task undertaken by a general contractor that is often unaware of the detailed constraints of other participants. Project schedules play a key role in this coordination and form the backbone of almost all current approaches to process coordination. However, no single schedule represents the perspective of all participants involved in a project. Rather, each participant keeps in some manner a schedule for its own activities, resulting in multiple schedules that need to be coordinated. The current literature does not support simultaneous reasoning across multiple distributed, overlapping schedules. This paper introduces constructs to formalize the integration of participants' overlapping schedules that represent the same project tasks, but use a different set breakdown structures and level of detail. Implementation of these constructs allows linking of the master schedule to the other participants' schedules thereby representing the perspectives of all project participants. This integrated perspective facilitates initial schedule coordination and allows rapid identification of schedule conflicts in response to any schedule changes. (C) 2008 Elsevier Ltd. All rights reserved.

关键词： Scheduling Project management Process coordination distributed processes

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Control of complex distributed systems with distributed intelligent agents

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JOURNAL OF PROCESS CONTROL 2007年第5期17卷 415-427页

作者： Tatara, Eric Cinar, Ali Teymour, Fouad IIT Dept Chem & Environm Engn Chicago IL 60616 USA

Control of spatially distributed systems is a challenging problem because of their complex nature, nonlinearity, and generally high order. The lack of accurate and computationally efficient model-based techniques for large, spatially distributed systems leads to challenges in controlling the system. Agent-based control structures provide a powerful tool to manago distributed systems by utilizing (organizing) local and global information obtained from the system. A hierarchical, agent-based system with local and global controller agents is developed to control networks of interconnected chemical reactors (CSTRs). The global controller agent dynamically updates local controller agent's objectives as the reactor network conditions change. One challenge posed is control of the spatial distribution of autocatalytic species in a network of reactors hosting multiple species. The multi-agent control system is able to intelligently manipulate the network flow rates such that the desired spatial distribution of species is achieved. Furthermore, the robustness and flexibility of the agent-based control system is illustrated through examples of disturbance rejection and scalability with respect to the size of the network. (C) 2006 Elsevier Ltd. All rights reserved.

关键词： agent-based control distributed processes reactor networks complex systems

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distributed Control of Descriptor Networks: A Convex Procedure for Augmented Sparsity

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IEEE TRANSACTIONS ON AUTOMATIC CONTROL 2023年第12期68卷 8067-8074页

作者： Sperila, Andrei Oara, Cristian Ciubotaru, Bogdan D. Sabau, Serban Univ Politehn Bucuresti Fac Automat Control & Comp Bucharest 060042 Romania Stevens Inst Technol Dept Elect & Comp Engn Hoboken 07030 NJ USA

For networks of systems, with possibly improper transfer function matrices, we present a design framework that enables H-infinity control, while imposing sparsity constraints on the coprime factors of the controller. We propose a convex and iterative optimization procedure with guaranteed convergence to obtain distributed controllers. By exploiting the robustness-oriented nature of our proposed approach, we provide the means to obtain sparse representations of our control laws that may not be directly supported by the nominal model of the network.

关键词： Convex optimization distributed processes descriptor systems sparse H-infinity control

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Rule-Based Coordination of distributed Web Service Transactions

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IEEE TRANSACTIONS ON SERVICES COMPUTING 2010年第1期3卷 60-72页

作者： von Riegen, Michael Husemann, Martin Fink, Stefan Ritter, Norbert Univ Hamburg Dept Informat D-22527 Hamburg Germany

Current approaches to transactional support of distributed processes in service-oriented environments are limited to scenarios where the participant initiating the process maintains a controlling position throughout the lifetime of the process. This constraint impedes support of complex processes where participants may only possess limited local views on the overall process. Furthermore, there is little support of dynamic aspects: failure or exit of participants usually leads to cancelation of the whole process. In this paper, we address these limitations by introducing a framework that strengthens the role of the coordinator and allows for largely autonomous coordination of dynamic processes. We first discuss motivating examples and analyze existing approaches to transactional coordination. Subsequently, we present our framework TracG, which is based on WS-BusinessActivity. It contains at its core a set of rules for deciding on the ongoing confirmation or cancelation status of participants' work and protocol extensions for monitoring the progress of a process. Various types of participant vitality for a process are distinguished, facilitating the controlled exit of nonvital participants as well as continuation of a process in case of tolerable failures. The implementation of the framework is presented and discussed regarding interoperability issues.

关键词： Service-oriented architectures distributed processes transaction management autonomous coordination

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Analysing a process landscape by simulation

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JOURNAL OF SYSTEMS AND SOFTWARE 2001年第3期59卷 333-342页

作者： Gruhn, V Wellen, U Univ Dortmund D-44221 Dortmund Germany

One purpose of analysing process models is to identify possible process improvements. Process modelling serves as a precondition for process model analysis. In this paper, we discuss how to model a process landscape at different levels of abstraction in order to do some static analysis. A process landscape consists of a set of hierarchically structured models for (distributed) processes. First we introduce the "Process Landscaping" method, which allows us to simulate different aspects of a complex set of processes. Afterwards, we focus on several simulation requirements and parameters needed to check consistency conditions and to analyse communication aspects of a given software process landscape. An example process landscape describes the development of e-business applications taking place at different locations. (C) 2001 Elsevier Science Inc. All rights reserved.

关键词： simulation process landscaping distributed processes process modelling language

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