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ACS/IEEE International Conference on Computer Systems and Applications

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

The paper presents the top-down design of a synchronization component refining the communication- oriented input/output behaviour into a state-based implementation. The component constrains the flow of messages on two parallel communication channels to stay within a specified tolerance. The formal derivation uses transformations which are of general importance for the design of interactive components. The differentiation of the stream function localizes the effect of a single input with respect to previous input histories. The history abstraction extracts the component's state from the input histories. The design safely bridges different views of the synchronization component ranging from the stream based specification to the state based implementation.

关键词： Asynchronous communication History Computer languages Communication channels Bridges Hardware Joining processes Computer interfaces Visualization Communication system control

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A loose interaction pattern for asynchronous components

A loose interaction pattern for asynchronous components

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Asia-Pacific Conference on software Engineering

作者： W. Dosch Institute of Software Technology and Programming Languages University of Lübeck Lubeck Germany

The paper studies the top-down design of a basic interaction pattern for asynchronously communicating components. The interaction pattern describes a high level protocol where an active sender component transmits messages to a passive receiver component controlled by the receiver's acknowledgements. The formal design refines the components' input/output behaviour into a state-based implementation based on three transformation steps. An architectural refinement decomposes the protocol function into a sender component and into a receiver component introducing a feedback channel. The differentiation localizes the effect of single inputs wrt, a previous input history. The history abstraction extracts the components' control state and data state from the input history.

关键词： History Protocols Communication system control software architecture Computer architecture Paper technology Computer languages Feedback Data mining Hardware

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Coordinating Almost Synchronous Communication Streams

Coordinating Almost Synchronous Communication Streams

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ICONS International Conference on Systems

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

An almost synchronous stream consists of a sequence of proper messages and pauses transmitted over a directed channel. The paper presents the transformational design of a communicating component which coordinates two almost synchronous streams. A proper message on one input channel is forwarded to the corresponding output channel as soon as there arrives a proper message on the other input channel as well. We refine the stream-based input/output behaviour to a state-based implementation exploiting two major transformations. The first transformation refines the component's infinite behaviour to a finite behaviour. The second transformation implements the component's finite behaviour by a state transition machine. The component's internal state is extracted from the input histories using a history abstraction function. Altogether, we explicate a formal method how to refine a specified infinite input/output behaviour of a communicating component by a state transition machine in the setting of almost synchronous streams.

关键词： History Computer languages Communication system software Java Bridges State-space methods Joining processes Visualization Communication system control

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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...

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International Conference on Systems and International Conference on Mobile Communications and Learning Technologies, (ICN/ICONS/MCL) International Conference on Networking

作者： W. Dosch Institute of Software Technology and Programming Languages University of Lübeck Lubeck Germany

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.

关键词： History Mobile communication Paper technology Computer languages Hardware Joining processes Communication system control Visualization Machine learning Communications technology

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Implementing the NAS benchmark MG in SAC

Implementing the NAS benchmark MG in SAC

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International Symposium on Parallel and Distributed Processing (IPDPS)

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

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With-loop scalarization -Merging nested array operations

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3145卷 118-134页

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

Construction of complex array operations by composition of more basic ones allows for abstract and concise specifications of algorithms. Unfortunately, naïve compilation of such specifications leads to creation of many temporary arrays at runtime and, consequently, to poor performance characteristics. This paper elaborates on a new compiler optimization, named WITH-LOOP-SCALARIZATION, which aims at eliminating temporary arrays in the context of nested array operations. It is based on WITH-loops, a versatile array comprehension construct used by the functional array language SAC both for specification as well as for internal representation of array operations. The impact of WITH-LOOP-SCALARIZATION on the runtime performance of compiled SAC code is demonstrated by several experiments involving support for arithmetic on arrays of complex numbers and the application kernel FT from the NAS benchmark suite. © Springer-Verlag 2004.

关键词： Specifications

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A Case Study on Data Protection for a Cloud- and AI-based Homecare Medical Device

A Case Study on Data Protection for a Cloud- and AI-based Ho...

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2022 International Health Data Workshop, HEDA 2022

作者： Bende, Philipp Vovk, Olga Caraveo, David Pechmann, Ludwig Leucker, Martin University of Lübeck Institute for Software Engineering and Programming Languages Lübeck Germany Tallinn University of Technology School of Information Technologies Department of Health Technologies Tallinn Estonia UniTransferKlinik Lübeck GmbH Lübeck Germany

To improve the treatment of many diseases, continuous monitoring of the patient at home with the ability of doctors to interact with individual cases demands an increasing number of medical devices connected to the cloud. To support the doctor’s duties, such devices may benefit from AI-based diagnosis routines. In order for such devices to be approved and placed on the market, they need to comply with various legal, regulatory, economic, and social requirements. An integral part of these requirements is the protection of the patients’ data. In this paper, based on a current use case, we describe a workflow on how to identify risks and address their mitigations. To this end, we recall the relevant legal, regulatory, economic, and social data protection requirements. We pursue our findings on a Homecare OCT device that is intended to be used by elderly patients on a daily basis, by taking images of their eyes and sending them for further analysis to a cloud- and AI-based system. The patient’s ophthalmologist gets notified for further dedicated treatment depending on the result. To perform the risk management, we describe (i) the architecture of the homecare system, (ii) analyze its data flow, (iii) discuss several vectors of attack, and (iv) propose ways to mitigate the risks. © 2022 Copyright for this paper by its authors.

关键词： Risk management

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A Case Study on Data Protection for a Cloud- and AI-Based Homecare Medical Device 43rd

A Case Study on Data Protection for a Cloud- and AI-Based...

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43rd International Conference on Application and Theory of Petri Nets and Concurrency , Petri Nets 2022

作者： Bende, Philipp Vovk, Olga Caraveo, David Pechmann, Ludwig Leucker, Martin Institute for Software Engineering and Programming Languages University of Lübeck Lübeck Germany School of Information Technologies Department of Health Technologies Tallinn University of Technology Tallinn Estonia UniTransferKlinik Lübeck GmbH Lübeck Germany

ISBN: (纸本)9783662681909

To improve the treatment of many diseases, continuous monitoring of the patient at home with the ability of doctors to interact with individual cases demands an increasing number of medical devices connected to the cloud. To support the doctor’s duties, such devices may benefit from AI-based diagnosis routines. In order for such devices to be approved and placed on the market, they need to comply with various legal, regulatory, economic, and social requirements. An integral part of these requirements is the protection of the patients’ data. In this paper, based on a current use case, we describe a workflow on how to identify risks and address their mitigations. To this end, we recall the relevant legal, regulatory, economic, and social data protection requirements. We pursue our findings on a Homecare OCT device that is intended to be used by elderly patients on a daily basis, by taking images of their eyes and sending them for further analysis to a cloud- and AI-based system. The patient’s ophthalmologist gets notified for further dedicated treatment depending on the result. We then compare the Homecare OCT device with a clinical OCT System in regard to various risks to patient data which arise when a medical system is used outside of a secure hospital environment. To perform the risk management, we describe (i) the architecture of both systems, (ii) analyze their data flow, (iii) discuss several vectors of attack, (iv) propose ways to mitigate the risks, and (v) discuss the handling of potential data breaches. © 2024, The Author(s), under exclusive license to Springer-Verlag GmbH, DE, part of Springer Nature.

关键词： Decision support systems

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A hybrid shared memory execution model for a data parallel language with I/O

A hybrid shared memory execution model for a data parallel l...

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作者： Grelck, Clemens Kuthe, Steffen Scholz, Sven-Bodo Institute of Software Technology and Programming Languages University of Lübeck Ratzeburger Allee 160 23538 Lübeck Germany Department of Computer Science University of Hertfordshire College Lane Hatfield AL10 9AB United Kingdom

We propose a novel execution model for the implicitly parallel execution of data parallel programs in the presence of general I/O operations. This model is called hybrid because it combines the advantages of the standard execution models fork/join and SPMD. Based on program analysis the hybrid model adapts itself to one or the other on the granularity of individual instructions. We outline compilation techniques that systematically derive the organization of parallel code from data flow characteristics aiming at the reduction of execution mode switches in general and synchronization/communication requirements in particular. Experiments based on a prototype implementation show the effectiveness of the hybrid execution model for reducing parallel overhead. © 2008 World Scientific Publishing Company.

关键词： Input output programs

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software Engineering Research and Applications 1

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丛书名： Lecture Notes in Computer Science

1000年

作者： Walter Dosch Roger Y. Lee Chisu Wu

ISBN: (数字)9783540321347

ISBN: (纸本)9783540321330

It was our great pleasure to extend a welcome to all who participated in SERA 2004, the second International Conference on software Engineering Research, Management and Applications, held at the Omni Hotel, Los Angeles, California, USA. The conference would not have been possible without the cooperation of Seoul National University, Korea, the University of Lübeck, Germany, and Central Michigan University, USA. SERA 2004 was sponsored by the International Association for Computer and Information Science (ACIS). The conference brought together researchers, practitioners, and advanced graduate students to exchange and share their experiences, new ideas, and research results in all aspects (theory, applications, and tools) of software Engineering Research and Applications. At this conference, we had keynote speeches by Barry Boehm, C.V. Ramamoorthy, Raymond Yeh, and Con Kenney. We would like to thank the publicity chairs, the members of our program committees, and everyone else who helped with the conference for their hard work and time dedicated to SERA 2004. We hope that SERA 2004 was enjoyable for all participants. Barry Boehm May 2004 Preface The 2nd ACIS International Conference on software Engineering – Research, Management and Applications (SERA 2004) was held at the Omni Hotel in Los Angeles, California, during May 5–7, 2004. The conference particularly welcomes contributions at the junction of theory and practice disseminating basic research with immediate impact on practical applications. The SERA conference series has witnessed a short, but successful history:

关键词： software Engineering/programming and Operating Systems software Engineering Computer Communication Networks Artificial Intelligence User Interfaces and Human Computer Interaction Management of Computing and Information Systems

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