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A timestamp model for determining real-time communications in intelligent networks

computer COMMUNICATIONS 1997年第4期20卷 211-218页

作者： Patel, A OConnell, S Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Dublin 4 Ireland

The provision of services such as credit card facilities using Intelligent Networks (IN) depends upon the ability to process real-time data. If their data is deliberately delayed during transit, these services may not be able to function accurately. This paper examines INs and highlights their vulnerability to network delay attacks. In particular, the nature of rear-time communications and the main approach that has been developed to determine whether received data is being sent in real-time or not is discussed. The deficiencies in this approach in terms of its ability to counteract the different forms of a network delay attack are highlighted and an alternative method which addresses these drawbacks is presented. Finally, the results achieved following the implementation and subsequent testing of the alternative approach are discussed. (C) 1997 Elsevier science B.V.

关键词： real-time communications IN network delay attack clock synchronisation

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SECURITY MANAGEMENT FOR OSI NETWORKS

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computer COMMUNICATIONS 1994年第7期17卷 544-553页

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

Security management is one of the key functional areas in open systems network management. Two key aspects of security management are managing user security services and providing security to network management systems. These are examined in tum to give the reader an overview of the state-of-the-art in security management. The ISO OSI Reference Model is used as a basis to present the security threats, security services and mechanisms which have to be managed. Telecommunications management networks are used as an example of management applications which both provide management and require the provision of security and security management services. The OSI approach to network management is examined in detail. This is followed by a survey of the categories of OSI security management activities, and a discussion of the security management needs of various common security services. The need for security for network management systems is examined.

关键词： SECURITY MANAGEMENT NETWORK MANAGEMENT OPEN systems ODP OSI TMN

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Performance analysis of an HDLC-based protocol with data compression

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computer COMMUNICATIONS 1997年第7期20卷 567-575页

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

Several international standards for asynchronous data compression are available today. In 1993 the International Telecommunication Union (ITU) started to research possible ways to compress synchronous data. Special attention was given to compatibility with previous asynchronous standards, namely V.42bis. In September 1993 a proposal for modification of the V.42bis standard to make ii applicable to synchronous data was published. In this paper a prototype of a synchronous data link layer protocol based on the ITU proposals is described. The protocol chosen is HDLC based. The V.42bis compression standard is adapted to serve the needs of a synchronous protocol. A functional model is designed followed by a performance analysis of the protocol. The analysis shows a decrease of the compression ratio due to the adaption of the compression algorithm. (C) 1997 Elsevier science B.V.

关键词： data compression HDLC data link LAP error correction

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An External Broker Interface Based on Existing Trading Protocols

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Electronic Commerce Research 2002年第4期2卷 337-358页

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

This paper presents an approach to the specification of external interfaces of an electronic broker used in the Architecture for Electronic Brokerage systems (AEBS). The external interface specified by the AEBS architecture provides both rich functionality and backward compatibility with trading methods that are currently in use in the electronic marketplace. This is achieved by defining the interface at two levels: the external protocol interface and the external object interface. The external protocol interface has been defined in terms of traditional protocols in order to provide access to basic brokerage services for customers and suppliers that already operate in the electronic market. This facilitates the easy introduction of a broker to the market since no modifications are required on the customer or supplier side to use the new brokerage services. The advanced external object interface has been designed and defined using the CORBA model. This provides other actors that need advanced brokerage services with access to the full functionality of a broker. This paper focuses on the design of the external protocol interface of a brokerage system. © 2002, Kluwer Academic Publishers.

关键词： Electronic commerce

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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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IEEE International Symposium on Object, Component, Service-Oriented Real-Time distributed Computing

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

ISBN: (纸本)9780769543680

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. © 2011 IEEE.

关键词： Embedded systems

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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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13th IEEE International Symposium on Object, Component, and Service-Oriented Real-Time distributed Computing, ISORC 2010

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

ISBN: (纸本)9780769540375

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. © 2010 IEEE.

关键词： Real time systems

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Controlling physical objects with privacy using secure RFID system

Controlling physical objects with privacy using secure RFID ...

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New Technologies, Mobility and Security Conference and Workshops, NTMS 2008

作者： Samad, Fahad Makram, Sadeq Ali Department of Computer Science Communication and Distributed Systems Informatik 4 RWTH Aachen University Germany

ISBN: (纸本)9782953244304

Security and privacy threats in technological environment are great hindrances to use latest technologies for our benefits. Such threats also exist in RFID systems which are currently utilized to a great extent in ubiquitous communication. These systems can also work in combination with cellular networks to control user's physical objects in a secure way with sufficient privacy. This paper presents a secure system model which enables a user to control his possessions even sitting remotely from the objects' locations. The limitations of RFID tags are taken into account and it is shown that the system mitigates many threats keeping the privacy of the tags and the user intact. © 2008 ESRGroups.

关键词： Hash functions

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Secure environment for information systems in medicine 3

Secure environment for information systems in medicine

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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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