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共 46 条记录，以下是31-40 订阅

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Integration of gpgpu methods into a pet reconstruction system

Integration of gpgpu methods into a pet reconstruction syste...

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9th IASTED international conference on parallel and distributed Computing and Networks, PDCN 2010

作者： Schaetz, Sebastian Kucera, Markus Department of Computer Science and Mathematics University of Applied Sciences Regensburg Germany

ISBN: (纸本)9780889868205

Positron emission tomography (PET) is a medical imaging modality that allows the detection of tissue with particular properties or the observation of metabolic processes in living organisms over time. It plays a vital role in cancer diagnosis and heart examination and represents a promising method for early diagnosis of dementia. With the advancement of scanner technology as well as an ever increasing demand for higher quality images and higher patient throughput the image reconstruction system can become a bottleneck of a PET system. To meet this demand for more computing power in the reconstruction system a novel way to speed up the image reconstruction process for modern PET systems is presented. A common graphics processing device in conjunction with the Compute Unified Device Architecture (CUDA) is used to speed up existing algorithms for the CPU. Projectors for full 3D reconstruction are ported to the CUDA device and new algorithms are implemented where necessary. the main focus of this port is to speed up the calculation and to maintain the numerical accuracy of the result. On the basis of the CPU reconstruction system a new system that uses GPU projectors is implemented. With this modification a two-fold speed up is achieved compared to the highly optimized CPU implementation running on 4 CPU cores. Different optimization methods are explored and applied where suitable. the results calculated by GPU and CPU projectors are numerically identical allowing them to be interchanged. the system is validated and the algorithms are integrated into the reconstruction system of Siemens Healthcare Molecular Imaging PET scanners.

关键词： three dimensional

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A review on parallel medical image processing on GPU

A review on parallel medical image processing on GPU

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international conference on Software Engineering and Computer Systems (ICSECS)

作者： Hui Liang Khor Siau-Chuin Liew Jasni Mohd Zain Faculty of Computer Systems and Software Engineering University Malaysia Pahang Lebuhraya Tun Razak Malaysia

An efficient implementation are necessary, as most medical imaging methods are computational expensive, and the amount of medical imaging data is growing. Graphic processing units (GPUs) can solve large data parallel problems at a higher speed than the traditional CPU, while being more affordable and energy efficient than distributed systems. this review investigates the use of GPUs to accelerate medical imaging methods. A set of criteria for efficient use of GPUs are defined. the review concludes that most medical image processing methods may benefit from GPU processing due to the methods' data parallel structure and high thread count. However, factors such as synchronization, branch divergence and memory usage can limit the speedup.

关键词： Graphics processing units Instruction sets Synchronization Biomedical imaging parallel processing Algorithm design and analysis Biomedical image processing

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the compares project: Connectionist methods for preprocessing and analysis of REmote sensing data 9th

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9th international conference on image Analysis and processing, ICIAP 1997

作者： Austin, J. Giacinto, G. Kanetlopoulos, I. Lees, K. Roli, F. Vernazza, G. Wilkinson, G. University of York United Kingdom University of Cagliari Sardinia Italy EC Joint Research Centre Ispra Italy Kingston University United Kingdom

ISBN: (纸本)3540635084

the European Concerted Action "COMPARES" (Concerted Action on COnnectionist methods for Preprocessing and Analysis of REmote Sensing Data) was hmded within the Environment and Climate Programme of the European Commission. the "COMPARES" project was aimed at focussing and coordinating future research at European level on the general theme of colmectionist computation in the field of Earth Observation (EO). Colmectionist computation can be interpreted as the use of artificial neural networks and parallel distributed processing systems. © Springer-Verlag Berlin Heidelberg 1997.

关键词： Neural networks

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Information Science, parallel and distributed Systems (ISPDS), international conference on

作者： Ya Zhou Ning Zhao Guimin Huang Nanxiao Deng Qingkai Guo Guangxi Key Laboratory of Image and Graphic Intelligent Processing School of Computer Science and Information Security Guilin University of Electronic Technology Guilin China

In sentence similarity research methods, sentence similarity is often calculated from semantic aspects, however, the influence of other features is ignored. For example, the influence of sentence syntactic structure and word order on sentence similarity is not considered. therefore, this paper proposes a method to measure the degree of similarity between sentences based on a multi-feature fusion of semantics, syntactic similarity and word order similarity, respectively. For the aspect of semantic similarity, in this paper, we first preprocess the sentence and obtain the word vectors, and then obtains sentence vector features through neural networks, so as to calculate the sentence semantic similarity; Finally, for the aspect of word order similarity, word order is considered as the auxiliary feature information to calculate sentence similarity since word order has a smaller effect on sentence similarity compared to the above information. the experimental results show that the proposed model has an accuracy of 77.4 % and an F1 value of 84.3% on the MRPC dataset.

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ADVANCES IN SOFTWARE ENGINEERING AND thEIR RELATIONS TO PATTERN RECOGNITION AND image processing.

ADVANCES IN SOFTWARE ENGINEERING AND THEIR RELATIONS TO PATT...

引用

作者： Tanimoto, Steven L.

In recent years ″software engineering″ has emerged as a discipline of programming. It includes the conceptualization, design, implementation, testing and modification of software systems. Related issues are languages, standards, distributed and parallel processing, and total programming environments. the fact that more than 80 percent of system development costs were in software rather than hardware helps one appreciate the importance of any effort to understand and enhance the software production process. Many pattern recognition projects involve fairly large software efforts. It makes sense not only for researchers to make use of the latest software tools and methodologies but also to anticipate future changes.

关键词： Computer software

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Scheduling and Capacity Design in Overlay Computing Systems

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12th international conference on Computational Science and Its Applications (ICCSA)

作者： Walkowiak, Krzysztof Kasprzak, Andrzej Kosowski, Michal Miziolek, Marek Wroclaw Univ Technol Dept Syst & Comp Networks Fac Elect PL-50370 Wroclaw Poland

ISBN: (纸本)9783642311277;9783642311284

parallel to new developments in the fields of computer networks and high performance computing, effective distributed systems have emerged to answer the growing demand to process huge amounts of data. Comparing to traditional network systems aimed mostly to send data, distributed computing systems are also focused on data processing what introduces additionally requirements in the system performance and operation. In this paper we assume that the distributed system works in an overlay mode, which enables fast, cost-effective and flexible deployment comparing to traditional network model. the objective of the design problem is to optimize task scheduling and network capacity in order to minimize the operational cost and to realize all computational projects assigned to the system. the optimization problem is formulated in the form of an ILP (Integer Linear Programming) model. Due to the problem complexity, four heuristics are proposed including evolutionary algorithms and Tabu Search algorithm. All methods are evaluated in comparison to optimal results yielded by the CPLEX solver. the best performance is obtained for the Tabu Search method that provides average results only 0.38% worse than optimal ones. Moreover, for larger problem instances with 20-minute limit of the execution time, the Tabu Search algorithm outperforms CPLEX for some cases.

关键词： distributed computing overlays ILP modeling optimization

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A Comparative Study of SVMs Model Optimized by Machine Learning methods in Water Quality Assessment of Dongting Lake

A Comparative Study of SVMs Model Optimized by Machine Learn...

引用

Information Science, parallel and distributed Systems (ISPDS), international conference on

作者： Zhen Xi Yun Xue Hunan Provincial Key Laboratory of Remote Sensing Monitoring of Ecological Environment in Dongting Lake Area Changsha Hunan China School of Municipal and Surveying Engineering Hunan City University Yiyang Hunan China

this paper presents 15 SVM models optimized by machine learning methods in water quality assessment. through comparative analysis, we found that all the models reached reasonable accuracy during the training and testing process. In particular, SAA-SVM-PI, GWO-SVM-PI, GWO-SVM-TN, PSO-SVM-TP models have the highest accuracy, the highest squared correlation and the lowest mean squared error when testing the three indexes of PI, TN and TP. In order to study the spatial distribution characteristics of water quality in Dongting Lake, GWO-SVM-PI, GWO-SVM-TN and PSO-SVM-TP models were respectively used for single-factor water quality classification. the results showed that: As far as the PI is concerned, the water quality is mainly in grade I and II; As far as TN is concerned, the water quality is mainly of grade iv and V, with the worst water quality in the East Dongting Lake and the outlet profile; In terms of TP, the water quality is mainly of grade III, iv and V, with the best inlet water quality, the worst water quality in the South Dongting Lake.

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Study of affine image warping on a linear processing array

Study of affine image warping on a linear processing array

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international conference on Pattern Recognition

作者： G. Gusciora J.A. Webb Electrical and Computer Engineering Department Carnegie Mellon University Pittsburgh PA USA School of Computer Science Carnegie Mellon University Pittsburgh PA USA

Several methods for parallel affine image warping on a linear processor array are considered. the methods were implemented on the Carnegie Mellon Warp machine and the Carnegie Mellon-Intel Corporation iWarp computer (treated as a linear array), and performance figures are provided. Both systolic methods, which feed one of the images in a stream, and non-systolic methods, which partition both images, are treated. A scanline method that combines some of the features of both, but which requires a fast transposed method is also described. the authors articulate three characteristics that affect the design of parallel image warping algorithms: affine warping is easily invertible, the mapping is known at the start of execution, and nearby input pixels map to nearby output pixels. the authors conclude that non-systolic methods give slightly better execution time and are easier to programs than systolic methods but require much larger processor memories.< >

关键词： Interpolation Forward contracts Lagrangian functions Polynomials Pixel Runtime distributed computing parallel machines Concurrent computing Feeds

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parallel coordinates visualization in the ELK stack 30

Parallel coordinates visualization in the ELK stack

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30th international conference on Computer Graphics and Machine Vision, GraphiCon 2020

作者： Galkin, Timofei Grigorieva, Maria National Research Nuclear University "MEPhI" Kashirskoe shosse 31 Moscow115409 Russia Scientific Research Computing Center Lomonosov Moscow State University Leninskie Gory 1 p.4 Moscow119991 Russia Moscow Center of Fundamental and Applied Mathematics Leninskie Gory 1 Moscow119991 Russia

Modern large-scale distributed computing systems, processing large volumes of data, require mature monitoring systems able to control and track in resources, networks, computing tasks, queues and other components. In recent years, the ELK stack has become very popular for the monitoring of computing environment, largely due to the efficiency and flexibility of the ElasticSearch storage and wide variety of Kibana visualization tools. the analysis of computing infrastructure metadata often requires the visual exploration of multiple parameters simultaneously on one graphical image. Stacked bar charts, heatmaps, radar charts are widely used for the multivariate visual data analysis, but these methods have limitations on the number of parameters. In this research the authors propose to enhance the capacity of Kibana, adding parallel Coordinates diagram - one of the most powerful method for visual interactive analysis of high-dimensional data. It allows to compare many variables together and observe correlations between them. this work describes the development process of parallel Coordinates as a Kibana plugin, and demonstrates an example of visual data analysis based on the Nginx logs metadata. © 2020 for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 international (CC BY 4.0).

关键词： Visualization

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Transactions on Computational Science XXXVII 1

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丛书名： Lecture Notes in Computer Science

1000年

作者： Marina L. Gavrilova C. J. Kenneth Tan Jian Chang Nadia Magnenat thalmann

ISBN: (数字)9783662619834

ISBN: (纸本)9783662619827

the LNCS journal Transactions on Computational Science reflects recent developments in the field of Computational Science, conceiving the field not as a mere ancillary science but rather as an innovative approach supporting many other scientific disciplines. the journal focuses on original high-quality research in the realm of computational science in parallel and distributed environments, encompassing the facilitating theoretical foundations and the applications of large-scale computations and massive data processing. It addresses researchers and practitioners in areas ranging from aerospace to biochemistry, from electronics to geosciences, from mathematics to software architecture, presenting verifiable computational methods, findings, and solutions, and enabling industrial users to apply techniques of leading-edge, large-scale, high performance computational ***, the 37th issue of the Transactions on Computational Science, is devoted to the area of Computer Graphics. the 9 papers included in the volume constitute extended versions of selected papers presented at the 36th Computer Graphics international conference, CGI 2019. Topics covered include virtual reality, augmented reality, image retrieval, animation of elastoplastic material, and visualization of 360°HDR images.

关键词： Computer Graphics Information Systems Applications (incl. Internet) User Interfaces and Human Computer Interaction image processing and Computer Vision Pattern Recognition

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