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3rd International Conference on Image Management and Communication in Patient Care: Requirements, Implementation and Assessment of Digital Imaging in Medicine, IMAC 1993

作者： Patel, Ahmed Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Belfield Dublin 4 Ireland

ISBN: (纸本)0818636408

This paper presents the Secure Environment for Information systems in Medicine (SEISMED) project which is funded by the Commission of the European Commzlnities (CEC) under the Advance Informatics in Medicine (AIM) programme. It discusses the aims and objectives of the project, its technical approach and results realised todate. It also gives an overview of the remainder of the work which will be undertaken up to the end of 1994. © 1993 IEEE.

关键词： Information systems

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Supporting meetings with a goal-driven service-oriented multimedia environment 1

Supporting meetings with a goal-driven service-oriented mult...

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1st ACM International Workshop on Multimedia Service Composition, MSC 2005

作者： Hummel, Karin Anna Jochum, Wolfgang Leitich, Stefan Schandl, Bernhard University of Vienna Faculty of Computer Science Department of Distributed and Multimedia Systems Liebiggasse 4/3-4 ViennaA-1010 Austria

ISBN: (纸本)1595932453

During the last decade the number of personal multimediaenabled devices has increased significantly in everyday usage. Additionally, high-end devices for multimedia environments enable multi-modal human computer interaction and in particular advanced collaboration. Most multimedia environments focus on efficient provisioning of multimedia services but show a lack of user-centric aspects, like explicit reasoning about the users' wishes and fulfillment of requirements. In this paper, we present a novel goal-driven approach for multimedia service composition which is able to reason about the users' demands and to adapt to new context situations in a non-intrusive manner. The fulfillment of goals is assured by hierarchical goal structuring, service provisioning, and evaluation of service fulfillment degrees. We apply this approach to a typical multimedia-enriched meeting scenario described by means of Semantic Web ontologies. A flexible and modular service-oriented software architecture demonstrates the usability of the envisioned companion-like smart meeting room. © 2005 ACM.

关键词： Multimedia services

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Issues of security and network security in health care information systems

Issues of security and network security in health care infor...

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作者： Patel, Ahmed Kantzavelou, Ioanna Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Belfield Dublin 4 Ireland

A Health Care Establishment (HCE) is an establishment where medical services are rendered. The above services are provided by the health care personnel. The infrastructure of a HCE may include Information Technology (IT) equipment that stores and processes HC information. Previously, IT equipment consisted solely of stand-alone systems, whereas in recent years, the trend has been towards computer networks and distributed systems in HCEs. The spread of distributed information technology in HCEs have necessitated the implementation of Security in HCISs, to assure confidentiality, integrity and availability of HCE information. This paper discusses the issues of Security and Network Security in Health Care Information systems (HCISs). It also suggests a method in establishing Network Security Guidelines and describes Principles for the provision of Network Security in HCEs. © 1996, The SEISMED Consortium.

关键词： Network security

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The RTSC: Leveraging the Migration from Event-Triggered to Time-Triggered systems

The RTSC: Leveraging the Migration from Event-Triggered to T...

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International Symposium on Object-Oriented Real-Time distributed Computing

作者： Fabian Scheler Wolfgang Schröder-Preikschat Department of Computer Science 4-Distributed Systems and Operating Systems Friedrich-Alexander University Erlangen Nuremberg

In this paper we present a prototype of the RTSC - the Real-Time System Compiler. The RTSC is a compiler-based tool that leverages the migration from event-triggered to time-triggered real-time systems. For this purpose, it uses an abstraction called Atomic Basic Blocks (ABBs) which is used to capture all relevant dependencies of the event-triggered system in a so-called ABB-graph. This ABB-graph is transformed by the RTSC and finally mapped to a statically computed schedule that could be executed by standard time-triggered real-time operating systems. Moreover, we demonstrate the applicability of our approach and the operation of our prototype by transforming the event-triggered implementation of a real-world embedded system into a trime-triggered equivalent.

关键词： Real time systems Prototypes operating systems distributed computing computer science Processor scheduling Embedded system Automatic control Space shuttles Aerospace electronics

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Dynamic weaving of components in a distributed environment 9

Dynamic weaving of components in a distributed environment

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9th ACM/IFIP/USENIX International Middleware Conference, Middleware 2008

作者： Söldner, Guido Kapitza, Rüdiger Schober, Sven Department of Computer Science 4 Friedrich-Alexander University Erlangen-Nuremberg Germany Institute of Distributed Systems Ulm University Germany

ISBN: (纸本)9781605583693

In ubiquitous computing, dynamic adaptation and the evolvability of software become increasingly important. This paper proposes AOCI, an aspect-oriented component infrastructure that combines the core ideas of aspect-oriented programming (AOP) and component based systems. Components are usually considered as black boxes that can be combined to form complex systems. In the context of our infrastructure, components export possible points of adaptation, which are tagged with ontological information. This information enables the use of AOP techniques without detailed knowledge about the component's internals, enabling distributed and dynamic adaptation. Copyright 2008 ACM.

关键词： Aspect oriented programming

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Escaping the Bonds of the Legacy: Step-Wise Migration to a Type-Safe Language in Safety-Critical Embedded systems

Escaping the Bonds of the Legacy: Step-Wise Migration to a T...

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International Symposium on Object-Oriented Real-Time distributed Computing

作者： Michael Stilkerich Jens Schedel Peter Ulbrich Wolfgang Schröder-Preikschat Daniel Lohmann Department of Computer Science 4-Distributed Systems and Operation Systems Friedrich-Alexander-Universitat Erlangen-Nuremberg Germany Department of Computer Science 4- Distributed Systems and Operating Systems Friedrich-Alexander University Erlangen-Nuremberg

Type-safe high-level languages such as Java have not yet found their way into the domain of deeply embedded systems, even though numerous attempts have been made to make these languages cost attractive. One major challenge that remains is the huge existing code base in many industries. Completely reengineering this code base is not viable for cost and time reasons. We present an approach that allows to isolatedly combine legacy software components and safe software components in an embedded system using the two most common communication idioms found in this domain. Our approach allows the developer to freely choose between hardware- and software-based isolation mechanisms. We demonstrate the feasibility of our approach by porting a non-trivial part of a real-world, hard real-time embedded avionics application. Our results show that the cost of this mixed-mode operation is on the same scale as the pure operation.

关键词： Java Runtime Embedded systems Engines Hardware Sensors

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Automated Surface Classification System Using Vibration Patterns - A Case Study With Wheelchairs

IEEE Transactions on Artificial Intelligence

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IEEE Transactions on Artificial Intelligence 2023年第4期4卷 884-895页

作者： Yu, Haoxiang Raychoudhury, Vaskar Saha, Snehanshu Edinger, Janick Smith, Roger O. Gani, Md Osman The University of Texas at Austin Department of Electrical and Computer Engineering AustinTX78712 United States Miami University Department of Computer Science & Software Engineering OxfordOH45056 United States Bits Pilani K.K. Birla Goa Campus Department of Computer Science & Information Systems Appcair Zuarinagar403726 India University of Hamburg Department of Informatics & Distributed Operating Systems Hamburg20146 Germany University of Wisconsin-Milwaukee Department of Rehabilitation Sciences & Technology MilwaukeeWI53706 United States University of Maryland Baltimore County Department of Information Systems BaltimoreMD21250 United States

Finding a barrier-free accessible path through the built environment is necessary for wheelchair users. Researchers have identified the effect of surface vibration on the health of wheelchair users and proposed various solutions to identify and annotate mobility barriers. However, the effects of surface-induced vibration on accessibility are yet to be investigated. In order to address this problem, we present the WheelShare system, which uses machine learning to identify surfaces and curbs from vibration captured by accelerometer and gyroscope sensors (both smartphone and wearable device). WheelShare allows users to share their collected data via crowdsourcing. Based on this surface-specific vibration, we recognize 32 different surfaces found across the built environment (in Austria, China, France, Germany, India, and the USA for 32 human subjects) with an accuracy of 97.5%. The recognized surfaces are then grouped into different categories based on their characteristics. Our novel contributions in this article include the following. 1) We have developed a machine-learning-enabled surface recognition system that uses sensor data to capture surface-induced vibration patterns. 2) We have tested the robustness of the system for devices with only accelerometer data (such as low-end smartphones) and achieved an accuracy of 91.6%. 3) We have deployed our prototype WheelShare system for real-time surface classification in new sites that are unseen in training and testing and successfully recognized the surface characteristics. © 2020 IEEE.

关键词： Accelerometers

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THE SYNCHRONIZATION OF NONUNIFORM NETWORKS OF FINITE AUTOMATA

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INFORMATION AND COMPUTATION 1992年第2期97卷 234-261页

作者： JIANG, T Department of Computer Science and Systems McMaster University Hamilton Ontario Canada L8S 4K1[∗]Research supported in part by a grant from SERB McMaster University and NSERC Operating Grant OGP 0046613.

The generalized firing squad synchronization problem (gfssp) is the well-known firing squad synchronization problem (fssp) extended to arbitrarily connected networks of finite automata. Here, the transmission delays associated with the links of a network are assumed to be 0; i.e., a signal can get through a link in no time. When the delays are allowed to be arbitrary non❉ integers, the problem is called gfssp-nud (i.e., gfssp with nonuniform delays). We give for the first time a solution of gfssp-nud. The solution is independent of the structure of the network and the actual delays of the links. The firing time of the solution is bounded by O(Δ3+τmax), where τmax is the maximum transmission delay of any single link and Δ is the maximum transmission delay between the general and any other node of a given network. This answers an open question in Mazoyer (in “Automata Networks” (C. Choffrut, Ed.), pp. 82–93, Springer-Verlag, Berlin/New York, 1986). Our result is based on a strategy different from the one of Balzer and Waksman, which is used in almost all existing solutions of fssp and gfssp. The extension of gfssp and gfssp-nud to networks with more than one general is also considered. We show that (1) for any fixed k≥2, gfssp with at most k generals has a solution whose firing time is bounded by O(D), where D is the maximum distance between any two nodes of a given network, and gfssp-nud with at most k generals has a solution whose firing time is bounded by O((Φ+τmax)3), where Φ is the maximum transmission delay between any two nodes of a given network; (2) there are no solutions for gfssp and gfssp-nud with an arbitrary number of generals.

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Performance analysis of computational approaches to solve Multiple Sequence Alignment

Performance analysis of computational approaches to solve Mu...

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作者： Montañola, Alberto Roig, Concepció Guirado, Fernando Hernández, Porfidio Notredame, Cedric Distributed Computing Group Computer Science and Industrial Engineering Department Universitat de Lleida Lleida Spain Computer Architecture and Operating Systems Department Universitat Autònoma de Barcelona Cerdanyola del Vallès Spain Barcelona Spain

In the biotechnology field, the deployment of the Multiple Sequence Alignment (MSA) problem, which is a high performance computing demanding process, is one of the new challenges to address on the new parallel systems. The aim of this problem is to find similar regions on biological sequences. Furthermore, the goal of MSA applications is to align as much sequences as possible with a level of quality that makes the alignment biologically meaningful. An efficiency study of different MSA implementations, based on T-Coffee (one of the most used MSA aligners), has been performed in order to find new optimizations that may improve the average execution time on multi-core systems. We found that the current parallel implementations have some performance issues, affecting negatively the scalability of the process. Finally, the proposed implementation based on the usage of threads in conjunction with a message-passing library is presented, with the aim to optimize the execution of the MSA problem in multi-core-based clusters. © 2012 Springer science+Business Media, LLC.

关键词： Message passing

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Consistent Replication of Multithreaded distributed Objects

Consistent Replication of Multithreaded Distributed Objects

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Reliable distributed systems

作者： Hans P. Reiser Jorg Domaschka Franz J. Hauck Rudiger Kapitza Wolfgang Schroder-Preikschat Distributed Systems Laboratory Faculty of Computer Science University of Ulm (EBS) Germany Germany Department of Distributed Systems and Operating Systems University Erlangen-Nuünberg Germany

Determinism is mandatory for replicating distributed objects with strict consistency guarantees. Multithreaded execution of method invocations is a source of nondeterminism, but helps to improve performance and avoids deadlocks that nested invocations can cause in a single-threaded execution model. This paper contributes a novel algorithm for deterministic thread scheduling based on the interception of synchronisation statements. It assumes that shared data are protected by mutexes and client requests are sent to all replicas in total order; requests are executed concurrently as long as they do not issue potentially conflicting synchronisation operations. No additional communication is required for granting locks in a consistent order in all replicas. In addition to reentrant mutex locks, the algorithm supports condition variables and time-bounded wait operations. An experimental evaluation shows that, in some typical usage patterns of distributed objects, the algorithm is superior to other existing approaches

关键词： Yarn System recovery Scheduling algorithm Frequency synchronization computer science operating systems Protection Multicast protocols computer crashes Concurrent computing

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