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Formal design of a slow-down component for almost synchronous streams

Formal design of a slow-down component for almost synchronou...

引用

International Conference on Networking, International Conference on Systems and International Conference on Mobile Communications and Learning Technologies, ICN/ICONS/MCL'06

作者： Dosch, Walter University of Lübeck Institute of Software Technology and Programming Languages 23538 Lübeck Germany

ISBN: (纸本)0769525520

The paper presents the systematic top-down design of a slown-down component that spreads an incoming stream of almost synchronous messages such that each two proper messages in the output stream are separated by at least one pause. We refine the communication-oriented input/output behaviour to a state-based implementation exploiting three important transformations. In the first design step, we approximate the component's infinite behaviour by an input/output synchronous finite behaviour. In the second design step, we differentiate the finite behaviour to localize the effect of single inputs with respect to previous input histories. In the third design step, we extract the component's state from the input histories by a state abstraction function. Throughout the paper, we explicate a formal method how to implement a specified input/output behaviour by a state transition machine. © 2006 IEEE.

关键词： Data communication systems

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Modeling software systems

Modeling software systems

引用

SNPD 2007: 8th ACIS International Conference on software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing

作者： Dosch, Walter Institute of Software Technology and Programming Languages University of Lübeck D-23538 Lübeck Germany

ISBN: (纸本)0769529097

The field of software engineering originally concentrated on "programming in the small" emphasizing implementation techniques. Over the last decades, software and systems engineering expanded to a comprehensive engineering discipline. Nowadays software engineering comprises requirements engineering, modeling and design, implementation and testing, installation and maintenance. software engineering proved to be a key technology;its mastery determines the functioning of modern infrastructures and consumer products. software development has matured from heuristic practice to an engineering discipline. In the meantime, software engineers can benefit from a solid stock of basic research addressing modeling and design techniques for sequential, concurrent, distributed, and timed systems. software quality and reliability, security and safety, the management of change, reuse and integration pose new requirements to the practice of software engineering. A major challenge consists in integrating the developed theories into a coherent engineering framework accepted by practitioners. software engineers face different system views described by a variety of graphical and textual formalisms. software development must safely bridge the system views on different levels of abstraction ranging from high-level specifications to executable code. The system views center around the data model, the communication model, the state transition model, and the trace model. The data model describes the data structure in an abstract or concrete way. The communication model manifests how a component interacts with the environment by exchanging messages. The state transition model describes an abstract implementation where an input affects an update of the internal state and a possible output. The trace model characterizes the operational behaviour of the system by a set of possible runs composed of atomic actions. The lecture classifies different system models and addresses discrete interactive sys

关键词： Computer software

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Implementing the NAS benchmark MG in SAC 16

Implementing the NAS benchmark MG in SAC

引用

16th International Parallel and Distributed Processing Symposium, IPDPS 2002

作者： Grelck, C. Medical University of Lübeck Institute for Software Technology and Programming Languages Lübeck23569 Germany

ISBN: (纸本)0769515738

SAC is a purely functional array processing language designed with numerical applications in mind. It supports generic, high-level program specifications in the style of APL. However, rather than providing a fixed set of built-in array operations, SAC provides means to specify such operations in the language itself in a way that still allows their application to arrays of any dimension and size. This paper illustrates the specificational benefits of this approach by means of a high-level SAC implementation of the NAS benchmark MG realizing 3-dimensional multigrid relaxation with periodic boundary conditions. Despite the high-level approach, experiments show that by means of aggressive compiler optimizations SAC manages to achieve performance characteristics in the range of low-level Fortran and C implementations. For benchmark size class A, SAC is outperformed by the serial Fortran-77 reference implementation of the benchmark by only 23%, whereas SAC itself outperforms a C implementation by the same figure. Furthermore, implicit parallelization of the SAC code for shared memory multiprocessors achieves a speedup of 7.6 with 10 processors. With these figures, SAC outperforms both automatic parallelization of the serial Fortran-77 reference implementation as well as an OpenMP solution based on C code. © 2002 IEEE.

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On optimising shape-generic array programs using symbolic structural information

引用

18th International Symposium on Implementation and Application of Functional languages, IFL 2006

作者： Trojahner, Kai Grelck, Clemens Scholz, Sven-Bodo University of Lübeck Institute of Software Technology and Programming Languages University of Hertfordshire Department of Computer Science

ISBN: (纸本)9783540741299

Shape-generic programming and high run time performance do match if generic source code is systematically specialised into nongeneric executable code. However, as soon as we drop the assumption of whole-world knowledge or refrain from specialisation for other reasons, compiled generic code is substantially less efficient. Limited effectiveness of code optimisation techniques due to the inherent lack of knowledge about the structural properties of arrays can be identified as the single most important source of inefficiency. However, in many cases partial structural information or structural relationships between arrays would actually suffice for optimisation. We propose symbolic array attributes as a uniform scheme to infer and to represent partial and relational structural information in shape-generic array code. By reusing the regular language to express structural properties in intermediate code, existing optimisations benefit from symbolic array attributes with little or no alteration. In fact, program optimisation and identification of structural properties cross-fertilise each other. We outline our approach in the context of the functional array language SAC and demonstrate its effectiveness by a small case study. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Information analysis

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The L̀ˆubeck Transformation System: A transformation system for equational higher order algebraic specifications

引用

15th International Workshop on Recent Trends in Algebraic Development Techniques, WADT 2001, Joint with the CoFI WG Meeting

作者： Dosch, Walter Magnussen, Sönke Institute for Software Technology and Programming Languages Medical University of Lübeck Lübeck Germany

ISBN: (纸本)3540431594

The Lübeck Transformation System supports the refinement of higher order algebraic specifications following sound transformation rules. We discuss the system requirements, describe the specification language and explain the life cycle of a specification in the transformation process. The system analyses various properties of the specification providing user guidance for further design decisions. The refinement relation is implemented by two refinement modes covering the different transformation rules for entire specifications and single axioms. Finally we describe the architecture and the implementation of the system. Throughout the paper, we accompany the presentation with a running example. © Springer-Verlag 2002.

关键词： Specifications

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ASIOS: A tool for the interactive transformation of algebraic specifications into object-oriented specifications

ASIOS: A tool for the interactive transformation of algebrai...

引用

2007 IEEE International Conference on Electro/Information technology, EIT 2007

作者： Dölle, Bastian Institute of Software Technology and Programming Languages University of Lübeck Ratzeburger Allee 160 D-23538 Lübeck Germany

ISBN: (纸本)1424409411

This paper presents an overview of the key features, the architecture, and the usage of the tool ASIOS which supports the systematic refinement of algebraic specifications into object-oriented specifications. The tool helps to bridge the gap between functional specification concepts and object-oriented modeling techniques. Moreover, an important area of application comprises the mechanized top-down development of information storing components. The tool has demonstrated in undergraduate courses to improve students' understanding for the conceptual differences of both specification techniques. Throughout the paper, we exemplify the usage of the tool using the well-known abstract data type stacks of natural numbers. ©2007 IEEE.

关键词： Specification languages

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Security goals assurance based on software active monitoring

Security goals assurance based on software active monitoring

引用

International Conference on Secure software Integration and Reliability Improvement

作者： Zhao, Changzhi Dong, Wei Leucker, Martin Qi, Zhichang Department of Computer Science National University of Defense Technology Changsha 410073 China Institute of Software Technology and Programming Languages University of Lubeck Germany

ISBN: (纸本)9780769544533

Access control is a vital security mechanism in today's operating systems and the security policies dictating the security relevant behaviors is lengthy and complex for example in Security-Enhanced Linux (SELinux). It is extremely difficult to verify the consistency between the security policies and the security goals desired by applications. In this paper we present how to predict whether the information flow security goal is violated or not during runtime how to generate the corresponding control actions on-line when divergence is detected and how to apply these actions in time based on software active monitoring technique. The symbolic security information flow model of SElinux is generated from a formalization of the access control mechanism which can be used to generate the N-step ahead projection of the future behavior. Information flow security goals are expressed in linear temporal logic (LTL) which provides clear description of the objectives desired by applications. Anticipatory monitor is generated from LTL formula automatically. We consider an on-line scheme where after the occurrence of an event, the next control action is determined on the basis of the N-step ahead projection of the future behavior. This procedure is repeated after the occurrence of next security relevant event. Thus a closed-loop system is generated that all behavior sequences will satisfy the security goals. © 2011 IEEE.

关键词： Access control

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An investigation of technical debt in automatic production systems 17

An investigation of technical debt in automatic production s...

引用

2017 XP Scientific Workshops, XP 2017

作者： Besker, Terese Martini, Antonio Bosch, Jan Tichy, Matthias Chalmers University of Technology Computer Science and Engineering Gothenburg Sweden Ulm University Institute of Software Engineering and Programming Languages Ulm Germany

ISBN: (纸本)9781450352642

Technical Debt is a recent concept, borrowed from the financial domain. It has been recently used in software development to describe technical sub-optimal solutions that have short-term benefits but long-term extra-costs. However, no body of literature investigates how Automatic Production Systems companies deal with Technical Debt. We investigated how Technical Debt is known, how much it hurts and how is managed in an automatic production systems company. Results from one in-depth investigation show that the automatic production systems company spend quite a lot of resources because of Technical Debt, both in the extra-costs (interest) and in its management. The company presents moderate awareness of what Technical Debt is and how much is present in its systems. However, the tracking level is quite low. We, therefore, claim that Technical Debt needs more research in this domain, as it is a source of substantial extracosts and the current practices to manage it are not suitable. © 2017 Association for Computing Machinery.

关键词： software design

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High-level design of a ternary asynchronous multiplexer

High-level design of a ternary asynchronous multiplexer

引用

14th International Conference on Intelligent and Adaptive Systems and software Engineering, IASSE 2005

作者： Dosch, W. Yeung, W.L. Institute of Software Technology and Programming Languages University of Lübeck Germany Department of Computing and Decision Sciences Lingnan University Hong Kong

ISBN: (纸本)9781604234558

The paper studies the systematic top-down design of a ternary asynchronous multiplexer refining its communication-oriented input/output behaviour into a state-based implementation. The formal design exploits two important transformations: differentiation localizes the effect of single inputs wrt. an input history, abstraction extracts the component's control state and data state from the previous input history.

关键词： Abstracting

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Axis control in SAC

引用

14th International Workshop on Implementation of Functional languages, IFL 2002

作者： Grelck, Clemens Scholz, Sven-Bodo University of Lübeck Institute of Software Technology and Programming Languages Germany University of Kiel Institute of Computer Science and Applied Mathematics Germany

ISBN: (纸本)3540401903

High-level array processing is characterized by the composition of generic operations, which treat all array elements in a uniform way. This paper proposes a mechanism that allows programmers to direct effects of such array operations to non-scalar subarrays of argument arrays without sacrificing the high-level programming approach. A versatile notation for axis control is presented, and it is shown how the additional language constructs can be transformed into regular SaC code. Furthermore, an optimization technique is introduced which achieves the same runtime performance regardless of whether code is written using the new notation or in a substantially less elegant style employing conventional language features. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Array processing

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