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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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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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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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Lean and efficient system software product lines: Where aspects beat objects

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Transactions on Aspect-Oriented Software Development II

作者： Lohmann, Daniel Spinczyk, Olaf Schröder-Preikschat, Wolfgang Friedrich-Alexander-University Erlangen-Nuremberg Computer Science 4 Distributed Systems and Operating Systems Germany

ISBN: (纸本)3540488901

Software development in the domain of embedded and deeply embedded systems is dominated by cost pressure and extremely limited hardware resources. As a result, modern concepts for separation of concerns and software reuse are widely ignored, as developers worry about the thereby induced memory and performance overhead. Especially object-oriented programming (OOP) is still little in demand. For the development of highly configurable fine-grained system software product lines, however, separation of concerns (SoC) is a crucial property. As the overhead of object-orientation is not acceptable in this domain, we propose aspect-oriented programming (AOP) as an alternative. Compared to OOP, AOP makes it possible to reach similar or even better separation of concerns with significantly smaller memory footprints. In a case study for an embedded system product line the memory costs for SoC could be reduced from 148-236% to 2-10% by using AOP instead of OOP. © Springer-Verlag Berlin Heidelberg 2006.

关键词： computer software

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From sensibility to responsibility: The impact of system software on ecological and economical sustainability of computing systems 45

From sensibility to responsibility: The impact of system sof...

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45. Jahrestagung der Gesellschaft fur Informatik: Informatik, Energie und Umwelt, INFORMATIK 2015 - 45th Annual Meeting of the German Informatics Society: computer science, Energy and Environment, INFORMATIK 2015

作者： Honig, Timo Department of Computer Science Distributed Systems and Operating Systems Martensstr. 1 ErlangenD-91058 Germany

ISBN: (纸本)9783885796404

From an ecological and economic perspective, saving energy is an important factor for the design of today's computing systems. However, building energy-efficient systems is a challenging task for system designers. It requires exact knowledge about the system's components (i.e., software and hardware components) and it is not immediately obvious how the energy demand of a system can be improved. This paper presents energy-aware programming techniques that help developers at optimizing the energy demand of software. Such techniques address sensibility aspects (i.e., energy awareness) and provide optimization suggestions to developers. The paper further discusses responsibility aspects that emerge from the advent of energy-aware programming techniques.

关键词： Software design

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Requirements and the concept of cooperative system management

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International Journal of Network Management 1998年第3期8卷 139-158页

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

Cooperation among various types of management functions is necessary to allow management functions to interwork in providing and using information services for systems management. To understand these tasks from the point of view of cooperative working, this article discusses the requirements and presents the concept of cooperative system management.

关键词： Management information systems

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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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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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