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7th ACM International Conference on Distributed Event-Based Systems, DEBS 2013

作者： Mutschler, Christopher Philippsen, Michael University of Erlangen-Nuremberg Department of Computer Science Programming Systems Group Erlangen Germany Fraunhofer Institute for Integrated Circuits IIS Locating and Communication Department Sensor Fusion and Event Processing Group Erlangen Germany

ISBN: (纸本)9781450317580

In surveillance, sports, finances, etc., distributed event-based systems are used to detect meaningful events with low latency in high data rate event streams. Both known approaches to deal with the predominant out-of-order event arrival at the distributed detectors have their shortcomings: buffering approaches introduce latencies for event ordering and stream revision approaches may result in system overloads due to unbounded retraction cascades. This paper presents a speculative processing technique for out-of-order event streams that enhances typical buffering approaches. In contrast to other stream revision approaches our novel technique encapsulates the event detector, uses the buffering technique to delay events but also speculatively processes a portion of it, and adapts the degree of speculation at runtime to fit the available system resources so that detection latency becomes minimal. Our technique outperforms known approaches on both synthetical data and real sensor data from a Realtime Locating System (RTLS) with several thousands of out-of-order sensor events per second. Speculative buffering exploits system resources and reduces latency by 40% on average. Copyright © 2013 ACM.

关键词： Middleware

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Cross-language code analysis and refactoring

Cross-language code analysis and refactoring

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2012 IEEE 12th International Working Conference on Source Code Analysis and Manipulation, SCAM 2012

作者： Mayer, Philip Schroeder, Andreas Department of Programming and Software Engineering Institute for Computer Science Ludwig-Maximilians-Universität München Germany

ISBN: (纸本)9780769547831

Software composed of artifacts written in multiple (programming) languages is pervasive in today's enterprise, desktop, and mobile applications. Since they form one system, artifacts from different languages reference one another, thus creating what we call semantic cross-language links. By their very nature, such links are out of scope of the individual programming language, they are ignored by most language-specific tools and are often only established - and checked for errors - at runtime. This is unfortunate since it requires additional testing, leads to brittle code, and lessens maintainability. In this paper, we advocate a generic approach to understanding, analyzing and refactoring cross-language code by explicitly specifying and exploiting semantic links with the aim of giving developers the same amount of control over and confidence in multi-language programs they have for single-language code today. © 2012 IEEE.

关键词： Semantics

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Corrigendum to ‘A single period inventory model with imperfect production and stochastic demand under chance and imprecise constraints’ [Eur. J. Oper. Res. 188 (2008) 121–139]

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European Journal of Operational Research 2013年第3期230卷 703-703页

作者： D. Panda S. Kar K. Maity M. Maiti Department of Engineering Science Haldia Institute of Technology Haldia Purba Medinipur Haldia West Bengal 721 657 India Department of Applied Mathematics with Oceanology and Computer Programming Vidyasagar University Midnapore 721 102 India

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Security goals assurance based on software active monitoring

Security goals assurance based on software active monitoring

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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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Resource-aware programming and simulation of MPSoC architectures through extension of X10 11

Resource-aware programming and simulation of MPSoC architect...

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Proceedings of the 14th International Workshop on Software and Compilers for Embedded Systems

作者： Hannig, Frank Roloff, Sascha Snelting, Gregor Teich, Jürgen Zwinkau, Andreas Hardware/Software Co-Design Department of Computer Science University of Erlangen Nuremberg Germany Programming Paradigms Group Karlsruhe Institute of Technology - KIT Germany

ISBN: (纸本)9781450307635

The efficient use of future MPSoCs with f 000 or more processor cores requires new means of resource-aware programming to deal with increasing imperfections such as process variation, fault rates, aging effects, and power as well as thermal problems. In this paper, we apply a new approach called invasive computing that enables an application programmer to spread computations to processors deliberately and on purpose at certain points of the program. Such decisions can be made depending on the degree of application parallelism and the state of the underlying resources such as utilization, load, and temperature. The introduced programming constructs for resource-aware programming are embedded into the parallel computing language X10 as developed by IBM using a library-based approach. Moreover, we show how individual heterogeneous MPSoC architectures may be modeled for subsequent functional simulation by defining compute resources such as processors themselves by lightweight threads that are executed in parallel together with the application threads by the X10 run-time system. Thus, the state changes of each hardware resource may be simulated including temperature, aging, and other useful monitor functionality to provide a first high-level programming test-bed for invasive computing. Copyright © 2011 ACM.

关键词： Parallel processing systems

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Fast RNA structure alignment for crossing input structures

Fast RNA structure alignment for crossing input structures

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作者： Backofen, Rolf Landau, Gad M. Möhl, Mathias Tsur, Dekel Weimann, Oren Bioinformatics Institute of Computer Science Albert-Ludwigs-Universität Freiburg Germany Department of Computer Science University of Haifa Haifa 31905 Israel Department of Computer Science and Engineering NYU-Poly Six MetroTech Center Brooklyn NY 11201-3840 United States Programming Systems Lab Saarland University Saarbrücken Germany Ben-Gurion University Beer-Sheva Israel Massachusetts Institute of Technology Cambridge MA 02139 United States

The complexity of pairwise RNA structure alignment depends on the structural restrictions assumed for both the input structures and the computed consensus structure. For arbitrarily crossing input and consensus structures, the problem is NP-hard. For non-crossing consensus structures, Jiang et al.'s (2002) [9] algorithm computes the alignment in O(n2m2) time where n and m denote the lengths of the two input sequences. If the input structures are also non-crossing, the problem corresponds to tree editing which can be solved in O(m2n(1+lognm)) time (Demaine et al., 2007) [3]. We present a new algorithm that solves the problem for d-crossing structures in O(dm2nlogn) time, where d is a parameter that is one for non-crossing structures, bounded by n for crossing structures, and much smaller than n on many practical examples. Crossing input structures allow for applications where the input is not a fixed structure but is given as base-pair probability matrices. © 2010 Elsevier B.V. All rights reserved.

关键词： RNA

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Security Goals Assurance Based on Software Active Monitoring

Security Goals Assurance Based on Software Active Monitoring

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International Conference on Secure System Integration and Reliability Improvement, SSIRI

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

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.

关键词： Context Monitoring Semantics Access control Cost accounting Syntactics

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Extraction of human mandible bones from multi-slice computed tomographic data

Extraction of human mandible bones from multi-slice computed...

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Middle East Conference on Biomedical Engineering (MECBME)

作者： Tamer M. Nassef Nahed H. Solouma Mohamed Alkhodary Mona K. Marei Yasser M. Kadah Computer and Programming Engineering Department Misr University for Science and Technology Six of October City Egypt Tissue Engineering Laboratory Alexandria University Alexandria Egypt National Institute of Laser Science Cairo University Giza Egypt Biomedical Engineering Department Cairo University Giza Egypt

A new approach for segmenting different anatomical regions in dental Computed Tomography (CT) studies is presented in this paper. It is expected that the proposed approach will help automate different tissues regions by providing initial boundary points for deformable models or seed points for split and merge segmentation algorithms. Preliminary results obtained for dental CT studies of dentate and edentulous human-mandible are presented with finite element models divided by tetrahedral elements, which built based on actual CT data combined with triangulation equations. Identification of different anatomical regions set for mandible cortical and cancellous bones by generated 3D models by marching cubes technique.

关键词： Finite element methods Computed tomography Implants Image segmentation Three dimensional displays Dentistry Solid modeling

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computer assisted determination of mandibular cystic lesion volume from computed tomographic data

Computer assisted determination of mandibular cystic lesion ...

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Middle East Conference on Biomedical Engineering (MECBME)

作者： Tamer M. Nassef Reham M. Fliefel Mona K. Marei Nahed H. Solouma Yasser M. Kadah Computer and Programming Engineering Department Misr University for Science and Technology Six of October City Egypt Tissue Engineering Lab Alexandria University Alexandria Egypt National Institute of Laser Science Cairo University Giza Egypt Biomedical Engineering Department Cairo University Giza Egypt

In this paper, a new approach for computing different anatomical regions in dental Computed Tomography (CT) is presented. The approach consists of two steps. First, a HU threshold window sets to separate between different regions upon their gray-level values; second, a set of objects are generated and texture descriptors are calculated for selected windows from the image data sample. Finally, identification of different anatomical regions set for mandible bones to determine the cystic lesion volume based on numerical methods. Preliminary results obtained for dental CT of female patient aged 14 years old complaining of bilateral swelling in her mandible are presented.

关键词： Bones Lesions Computed tomography Three dimensional displays Pixel Surgery Solid modeling

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Designing modularity architecture for multithread programming

Designing modularity architecture for multithread programmin...

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4th International Conference on Communications and Information Technology, CIT'10

作者： Netinant, Paniti Computer Science Department Bangkok University Bangkok Thailand Concurrent Programming Research Group Illinois Institute of Technology Chicago IL United States

ISBN: (纸本)9789604742073

Multithreaded Object-Oriented programming in concurrency environment using object-oriented technology is a complex activity. Programmers need to be aware of issues unrelated to their domain of problem, and are often unprepared for the challenges of the concurrent object-oriented programming brings. The interaction of their components becomes more complex, and makes it difficult to validate the design and correctness of the implemented program. Supporting separation of concerns in the design and implementation of the multithreaded object-oriented programming can provide a number of benefits such as comprehension, reusability, extensibility and adaptability in both design and implementation. We have tackled this problem by adopting the technique of separation of concerns in multithreaded object-oriented programming. In this paper we demonstrate an Aspect-Oriented approach that can be used for multithreaded object-oriented programming. We also show how better the separation of concerns in components. Readers/Writers problem is demonstrated using an aspect-oriented approach. Our methodology, which is based on aspect-oriented techniques as well as language and architecture independence, is an aspect-oriented framework.

关键词： Reusability

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