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IEEE Symposium on Nuclear science (NSS/MIC)

作者： Fabian Gigengack Lars Ruthotto Martin Burger Carsten H. Wolters Xiaoyi Jiang Klaus P. Schäfers European Institute for Molecular Imaging (EIMI) and the Department of Mathematics and Computer Science University of Münster Germany Institute of Mathematics and Image Computing (MIC) University of Lübeck Germany Institute for Computational and Applied Mathematics University of Münster Germany Institute for Biomagnetism and Biosignalanalysis University of Münster Germany Department of Mathematics and Computer Science University of Münster Germany

Image degradation due to motion is a known problem in Positron Emission Tomography (PET). To reduce motion artifacts in PET, gating based techniques were found applicable. In pure respiratory gated PET, each gate still contains cardiac motion. Analogously, pure cardiac gated PET images still contain respiratory motion. Hence, we make use of dual (joint respiratory and cardiac) gating to further reduce the amount of motion contained in the images. The inclusion of non-rigid cardiac motion leads to intensity modulations caused by the Partial Volume Effect (PVE). To overcome the intensity modulations we identified and considered the mass-preserving property of PET images in the Variational Algorithm for Mass-Preserving Image REgistration (VAMPIRE). The aim of this paper is the elimination of both cardiac and respiratory motion in thoracic dual gated PET without a loss of statistic. The strategy of our proposed motion correction approach is: 1) Dual gating, 2) Mass-preserving motion estimation (VAMPIRE), and 3) Averaging of the aligned images. In a patient study we showed that the proposed mass-preserving motion correction strategy significantly removes motion artifacts in cardiac PET. VAMPIRE achieved accurate results that resemble cardiac and respiratory motion across all patients.

关键词： Argon Logic gates Robustness Positrons Positron emission tomography

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Simulation-Based Performance Analysis and Tuning for a Two-Level Directly Connected System

Simulation-Based Performance Analysis and Tuning for a Two-L...

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： Ehsan Totoni Abhinav Bhatele Eric J. Bohm Nikhil Jain Celso L. Mendes Ryan M. Mokos Gengbin Zheng Laxmikant V. Kale Department of Computer Science University of Illinois at Urbana-Champaign Urbana IL USA Center of Applied Scientific Computing Lawrence Livermore National Laboratory Livermore CA USA National Center of Supercomputing Applications University of Illinois Urbana IL USA

Hardware and software co-design is becoming increasingly important due to complexities in supercomputing architectures. Simulating applications before there is access to the real hardware can assist machine architects in making better design decisions that can optimize application performance. At the same time, the application and runtime can be optimized and tuned beforehand. BigSim is a simulation-based performance prediction framework designed for these purposes. It can be used to perform packet-level network simulations of parallel applications using existing parallel machines. In this paper, we demonstrate the utility of BigSim in analyzing and optimizing parallel application performance for future systems based on the PERCS network. We present simulation studies using benchmarks and real applications expected to run on future supercomputers. Future petascale systems will have more than 100,000 cores, and we present simulations at that scale.

关键词： Noise Topology Tuning Network topology Routing Supercomputers Three dimensional displays

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The role of natural language in social information engineering

The role of natural language in social information engineeri...

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AFRICON Conference

作者： Kurt Englmeier Fionn Murtagh Josiane Mothe Javier Pereira Duska Rosenberg Factulty of Computer Science Schmalkalden University of Applied Science Schmalkalden Germany IRIT Laboratory Université Paul Sabatier Toulouse France Department of Computer Science Royal Holloway University of London Egham UK Escuela de Informática Universidad Diego Portales Santiago Chile ICom Centre of Research in Information Computing and Communication Royal Holloway University of London Egham UK

In this paper we present work-in-progress - a technology platform for Social Collaboration in the context of Personalized Information Extraction. In particular, we consider elements of user-centered software engineering as it converges on the development of folksonomies. Results from our work-in-progress demonstrate to what extent non-IT users can apply natural language when managing their IT-based processes addressing information integration. We concentrate on the language model that supports the development of process-related folksonomies in the context of retrieving and merging textual information from different sources concerning legal documents. Findings in our work-in-progress underpin the conjecture that the computational nature of natural language overcomes the inherent problem of ambiguity when applied in a collaboration context that the users are aware of.

关键词： Data mining Collaboration Engines Ontologies Contracts Natural languages Humans

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Mass-preserving motion correction of PET: Displacement field vs. spline transformation

Mass-preserving motion correction of PET: Displacement field...

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IEEE Symposium on Nuclear science (NSS/MIC)

作者： Fabian Gigengack Lars Ruthotto Martin Burger Carsten H. Wolters Xiaoyi Jiang Klaus P. Schäfers European Institute for Molecular Imaging (EIMI) and the Department of Mathematics and Computer Science University of Münster Germany Institute of Mathematics and Image Computing (MIC) University of Lübeck Germany Computational and Applied Mathematics University of Münster Germany Institute for Biomagnetism and Biosignalanalysis University of Münster Germany Department of Mathematics and Computer Science University of Münster Germany European Institute for Molecular Imaging (EIMI) University of Münster Germany

In Positron Emission Tomography (PET), motion due to the cardiac and respiratory cycle causes blurred images. Different approaches for motion correction in PET vary in the general concept (optical flow or image registration) or, e.g., in the discretization of motion. Given our mass-preserving transformation model, we evaluate different motion models in this work: dense displacement field (compute for each voxel an individual displacement) vs. spline transformation (i.e. free-form deformation). Thereby a focus is put on the parametrization of the spline transformations where we optimize the number of spline coefficients and the regularization parameter. We make a quantitative comparison of the motion estimates of the different motion models based on data of the established XCAT software phantom. For both motion models (Displacement Field (DF) and Spline Transformation (ST)) the registration results are evaluated by 1) the total processing time and 2) the Euclidean distance to the ground-truth vectors provided by the XCAT phantom. We found that the spline transformation model is superior to the displacement field strategy in terms of processing time and accuracy.

关键词： Positron emission tomography Software Spline Accuracy

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K, T and D-like fuzzy Kripke models

K, T and D-like fuzzy Kripke models

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： Benjamin Bedregal Regivan H. N. Santiago Mario Benevides Petrúcio Viana Group of Logic Language Information Theory and Applications-LoLITA Department of Informatics and Applied Mathematics Federal University of Rio Grande do Norte Natal Rio Grande do Norte Brazil Program of Engineering of Systems and Computing-PESC Department of Computer Science Federal University of Rio de Janeiro Rio de Janeiro Rio de Janeiro Brazil Department of Analysis Fluminense Federal University (UFF) Niteroi Rio de Janeiro Brazil

The idea of a Kripke semantics endowed with possibility/plausibility information is not new; in fact there are different approaches for that; see: [6], [13], [16], [19]. This paper follows the approach found in [6], but whereas [6] provides a fixed interpretation for connectives into [0,1] here we provide a characterization of a fuzzy semantics for connectives in such a way that the resulting fuzzy frames: K, T and D, are described precisely by the set of statements which also describes, respectively, the usual modal systems K, T and D.

关键词： Semantics Fuzzy sets Fuzzy logic Bismuth Electronic mail Uncertainty Reliability

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Functionality delegation in distributed surveillance systems

Functionality delegation in distributed surveillance systems

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2010 7th IEEE International Conference on Advanced Video and Signal Based Surveillance, AVSS 2010

作者： Saini, Mukesh K. Atrey, Pradeep K. Emmanuel, Sabu Kankanhalli, Mohan S. School of Computing National University of Singapore Singapore Department of Applied Computer Science University of Winnipeg Canada School of Computer Engineering Nanyang Technological University Singapore

ISBN: (纸本)9780769542645

The utilization of multimedia devices is growing rapidly in surveillance and monitoring applications. These multimedia surveillance systems need to process large amounts of multimodal sensor data in order to detect events and objects. While processing this large amount of data, the system faces many processing and network bottlenecks. The design of efficient multimedia surveillance system requires intelligent architectural decisions and performance evaluation to cope with these resource demands. One critical issue among all these architectures is task assignment among processing units. To study the effect of this task assignment on system performance with quantifiable performance measures is very useful and challenging. We define a Functionality Delegation Coefficient which abstracts the delegation of functionality among processing units of a distributed surveillance system and show its effect on event blocking probability and response time. Simulation and real implementation results are provided to validate the model. © 2010 IEEE.

关键词： Blocking probability

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Modeling and planning collaboration using organizational constraints

Modeling and planning collaboration using organizational con...

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作者： Igler, Michael Moura, Paulo Faerber, Matthias Zeising, Michael Jablonski, Stefan Department of Applied Computer Science IV University of Bayreuth Germany Dep. of Computer Science University of Beira Interior Portugal Center for Research in Advanced Computing Systems INESC Porto Portugal

ISBN: (纸本)9780984589326

Process management systems play an important role for today's information systems. They coordinate the work items among employees and ensure the correct execution of processes. In this paper we focus on the organizational perspective of process management systems. This perspective is responsible for assigning people together with their roles within business organizations to process execution. A key issue in integrating the organizational perspective into processes is the strategy for selecting people to execute work steps. This assignment is the basis for collaboration among the people of an organization within a process-based application. We implemented our approach in ESProNa, a Logtalk application running in SWI-Prolog extended with the Thea library providing direct and complete support for OWL2 ontologies. The use of these languages allows the definition of comprehensive organizational constraints. We will cover both, the definition of these constraints in the process model, and their interpretation by the process execution engine. Further we will show how the organizational perspective impacts the order of process execution, i. e. the way of collaboration between the assigned people decisively. © 2010 ICST.

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A network management system based on DPI

A network management system based on DPI

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International Conference on Network-Based Information Systems

作者： Yang, Chu-Sing Liao, Ming-Yi Luo, Mon-Yen Wang, Shin-Min Yeh, C. Eugene Department of Electrical Engineering Institute of Computer and Communication Engineering National Cheng Kung University Taiwan Department of Computer Science and Information Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan National Center for High-Performance Computing Taiwan

ISBN: (纸本)9780769541679

More and more network applications have appeared in recent years. Government, university, industry and individual Internet users and network services need more bandwidth and various network applications. Many new network protocols are proposed so that it is now becoming harder to manage the network. In the conditional network, every network protocol uses the fixed port, the so-called well-known port number. In the past, it was easy to classify and manage the network traffic because we could identify the network service by the port number. However, new types of network applications do not use fixed port number. The method of traffic classification with fixed port number is inadequate. In recent years, the DPI (Deep Packet Inspection) is used to classify the traffic. This study deploys a NMS (network management system) based on DPI and SNMP. The NMS controls the network devices and services according to the traffic classification of DPIS (DPI server). The platform of DPIS is implemented on the Netfilter framework in Linux kernel. © 2010 IEEE.

关键词： Network management

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All Nonclassical Correlations Can Be Activated into Distillable Entanglement

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Physical Review Letters 2011年第22期106卷 220403-220403页

作者： Marco Piani Sevag Gharibian Gerardo Adesso John Calsamiglia Paweł Horodecki Andreas Winter Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo Waterloo N2L 3G1 Canada Institute for Quantum Computing and School of Computer Science University of Waterloo Waterloo N2L 3G1 Canada School of Mathematical Sciences University of Nottingham University Park Nottingham NG7 2RD United Kingdom Física Teòrica: Informació i Fenòmens Quàntics Universitat Autònoma de Barcelona 08193 Bellaterra Spain Faculty of Applied Physics and Mathematics Technical University of Gdańsk 80-952 Gdańsk Poland National Quantum Information Centre of Gdańsk 81-824 Sopot Poland Department of Mathematics University of Bristol Bristol BS8 1TW United Kingdom Centre for Quantum Technologies National University of Singapore Singapore 117542

We devise a protocol in which general nonclassical multipartite correlations produce a physically relevant effect, leading to the creation of bipartite entanglement. In particular, we show that the relative entropy of quantumness, which measures all nonclassical correlations among subsystems of a quantum system, is equivalent to and can be operationally interpreted as the minimum distillable entanglement generated between the system and local ancillae in our protocol. We emphasize the key role of state mixedness in maximizing nonclassicality: Mixed entangled states can be arbitrarily more nonclassical than separable and pure entangled states.

关键词： Quantum optics

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Fast Freehand Acquisition of 3D Objects and Their Visualization

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通讯和计算机（中英文版） 2010年第3期7卷 13-24页

作者： Gabriele peters Klaus haming Department of Computer Science Visual Computing University of Applied Sciences and Arts Dortmund Dortmund D-44227Germany

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