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Storage and Processing Technologies of Cognitive Content for eLearning Systems

Storage and Processing Technologies of Cognitive Content for...

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Russia and pacific conference on computer Technology and applications (RPC)

作者： S.V. Tarkhov N.S. Minasova Sh.M. Minasov L.M. Tarkhova Department of Computer Science Ufa State Aviation Technical University Ufa Russia Department of Mechanics and Engineering Graphics Bashkir State Agrarian University Ufa Russia

ISBN: (纸本)9781538675328

Described the technologies of structuring, decomposition, storage organization and personal-oriented assembly of training content in web-oriented open eLearning systems. Hierarchical object-oriented model allows to store decomposed to low-level data and perform automated reconstruction cognitive content provided to trainee in the compiled modules form, that contain training materials and management procedures adaptive eLearning. The technology is used for virtual knowledge space building.

关键词： Electronic learning Training Metadata Shape Object oriented modeling Adaptation models

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Spy in the GPU-box: Covert and Side Channel Attacks on Multi-GPU System 50

Spy in the GPU-box: Covert and Side Channel Attacks on Multi...

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50th Annual International Symposium on computer Architecture (ISCA)

作者： Dutta, Sankha Baran Naghibijouybari, Hoda Gupta, Arjun Abu-Ghazaleh, Nael Marquez, Andres Barker, Kevin Pacific Northwest Natl Lab Richland WA 99352 USA Binghamton Univ Dept Comp Sci Binghamton NY USA Univ New Mexico Dept Elect & Comp Engn Albuquerque NM USA Univ Calif Riverside CSE Dept Riverside CA USA Univ Calif Riverside ECE Dept Riverside CA USA

ISBN: (纸本)9798400700958

The deep learning revolution has been enabled in large part by GPUs, and more recently accelerators, which make it possible to carry out computationally demanding training and inference in acceptable times. As the size of machine learning networks and workloads continues to increase, multi-GPU machines have emerged as an important platform offered on High Performance Computing and cloud data centers. Since these machines are shared among multiple users, it becomes increasingly important to protect applications against potential attacks. In this paper, we explore the vulnerability of Nvidia's DGX multi-GPU machines to covert and side channel attacks. These machines consist of a number of discrete GPUs that are interconnected through a combination of custom interconnect (NVLink) and PCIe connections. We reverse engineer the interconnected cache hierarchy and show that it is possible for an attacker on one GPU to cause contention on the L2 cache of another GPU. We use this observation to first develop a covert channel attack across two GPUs, achieving the best bandwidth of around 4 MB/s. We also develop a prime and probe attack on a remote GPU allowing an attacker to recover the cache access pattern of another workload. This access pattern can be used in any number of side channel attacks: we demonstrate a proof of concept attack that fingerprints the application running on the remote GPU, with high accuracy. We also develop a proof of concept attack to extract hyperparameters of a machine learning workload. Our work establishes for the first time the vulnerability of these machines to microarchitectural attacks and can guide future research to improve their security.

关键词： graphics processing unit

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Efficient designs of flaoting-point CORDIC rotation and vectoring operations

Efficient designs of flaoting-point CORDIC rotation and vect...

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IEEE Asia-pacific conference on Circuits and Systems

作者： Shen-Fu Hsiao Hsin-Mau Lee Yen-Chun Cheng Ming-Yu Tsai Department of Computer Science and Engineering National Sun Yat-Sen University Kaohsiung Taiwan

Two processor designs are presented that can compute CORDIC rotation and vectoring operations in floating-point representation. In order to achieve the required accuracy, we partition the computation into two phases: coarse and fine, and look for efficient design approaches to minimize the area cost as well as the latency. The proposed architectures can perform floating-point CORDIC in both vectoring and rotation modes, allowing them to be applied to applications that require high accuracy arithmetic computations with large data ranges, such as 3D graphics acceleration.

关键词： computer architecture Floating-point arithmetic graphics Fixed-point arithmetic Delay computer science Design engineering Process design Costs High performance computing

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Image quilting for texture synthesis: a revisit & a variation

Image quilting for texture synthesis: a revisit & a variatio...

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International conference on Information, Communications and Signal Processing

作者： J.T. O'Brien D.S. Wickramanayake E.A. Edirisinghe H.E. Bez Parallel Algorithms & Architectures Research Centre Department of Computer Science Loughborough University UK

ISBN: (纸本)0780381858

The current trends in computer animations, virtual reality and augmented reality applications have resulted in the problem of texture synthesis receiving considerable attention from the computer graphics and image processing research community. In this paper we revisit the well-known texture synthesis method, image quilting, first proposed by Efros and Freeman and propose improvements to its algorithms and implementation. Further, we outline its application within a multiresolution framework, particularly suited for modern imaging applications associated with compressed image data. We provide experimental results to prove the effectiveness of the proposed modifications and variation.

关键词： Application software Image processing Animation Virtual reality computer graphics Image generation Surface texture Stochastic processes Markov random fields Computational modeling

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pacific island 98

Pacific island

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ACM SIGGRAPH 98 conference abstracts and applications

作者： Vinh Nguyen Maynard Evans High School

No abstract available.

ISBN: (纸本)9781581130461

No abstract available.

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Efficient handling of stream buffers in GPU stream-based computing platform

Efficient handling of stream buffers in GPU stream-based com...

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IEEE pacific Rim conference on Communications, computers and Signal Processing

作者： Shinichi Yamagiwa Masahiro Arai Koichi Wada School of Information Kochi University of Technology Kami Kochi Japan Department of Computer Science University of Tsukuba Tsukuba Ibaraki Japan

GPU-based computing has become one of the popular high performance computing fields. The field is called GPGPU. This paper presents design and implementation of a uniform GPGPU application that is optimized for both the legacy and the recent GPU architectures. As a typical example of such the GPGPU application, this paper will discuss the uniform implementation of the Caravela platform, with focusing on the method of handling stream buffers. Two methods for handling streams have been proposed and implemented. To verify the effectiveness of the proposed methods, evaluation has been done using applications.

关键词： graphics processing unit computer architecture Kernel Runtime Instruction sets graphics Programming

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Hierarchical representation of time-varying volume data with /sup 4//spl radic/2 subdivision and quadrilinear B-spline wavelets

Hierarchical representation of time-varying volume data with...

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pacific conference on computer graphics and applications

作者： L. Linsen V. Pascucci M.A. Duchaineau B. Hamann K.I. Joy Center for Image Processing and Integrated Computing (CIPIC) University of California Davis USA Center for Applied Scientific Computing (CASC) Data Science Group Lawrence Livermore National Laboratory USA Center for Applied Scientific Computing (CASC) Data Science Group Lawrence Livermore National Laboratory Center for Image Processing and Integrated Computing (CIPIC) University of California Davis

Multiresolution methods for representing data at multiple levels of detail are widely used for large-scale two- and three-dimensional data sets. We present a four-dimensional multiresolution approach for time-varying volume data. This approach supports a hierarchy with spatial and temporal scalability. The hierarchical data organization is based on /sup 4//spl radic/2 subdivision. The /sup n//spl radic/2-subdivision scheme only doubles the overall number of grid points in each subdivision step. This fact leads to fine granularity and high adaptivity, which is especially desirable in the spatial dimensions. For high-quality data approximation on each level of detail, we use quadrilinear B-spline wavelets. We present a linear B-spline wavelet lifting scheme based on /sup n//spl radic/2 subdivision to obtain narrow masks for the update rules. Narrow masks provide a basis for out-of-core data exploration techniques and view-dependent visualization of sequences of time steps.

关键词： Spline Large-scale systems Spatial resolution Data visualization Image processing Scientific computing computer science Laboratories Image resolution Large scale integration

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A guided interaction approach for architectural design in a table-type VR environment 3rd

A guided interaction approach for architectural design in a ...

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3rd IEEE pacific Rim conference on Multimedia, PCM 2002

作者： Kim, Myoung-Hee Choi, Soo-Mi Rhee, Seon-Min Kwon, Doo-Young Kim, Hyo-Sun Ewha Womans Univ Dept. of Computer Science and Engineering 11-1 Daehyun-dong Seodaemun-gu Seoul Korea Republic of Ewha Womans Univ Center for Computer Graphics and Virtual Reality 11-1 Daehyundong Seodaemun-gu Seoul Korea Republic of Sejong Univ Dept. of Software Engineering 98 Gunja-dong Gwangjin-gu Seoul Korea Republic of

ISBN: (纸本)3540002626

In this paper, we present a guided interaction approach for architectural design in a table-type VR environment (virtual table). By making it easier to communicate between two or more people in a virtual space, the virtual table is effectively used in architectural visualization, medical visualization, and scientific visualization. However, most applications provide simple functions with easy handling or focus on visualization because accurate interaction on the virtual table is not easy. We developed a table-type VR tool for architectural design using guided 3-D interaction techniques. It consists of the interactive VR modeler, the architectural interpreter and the hybrid tracker. We also introduce architectural design process from the very initial stage to the final one by using our tool. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Architectural design

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Advanced Drilling Simulation and Engineering Center provide support for challenging drilling operations in the South China Sea

Advanced Drilling Simulation and Engineering Center provide ...

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IADC/SPE Asia pacific Drilling Technology conference 2016

作者： Tang, Hu Yong Gang, Wei Rommetveit, Rolv Chusov, Alexey Helgeland, Stig Namork, Lars CNOOC China EDrilling Norway Oiltec Solutions Norway

ISBN: (纸本)9781613994504

An Advanced Drilling Simulation and Engineering Center has been established in Tianjin in China. This center has been set up with simulation systems for the whole life cycle of well construction;from planning to training to operation / Real Time and to Post-analysis. A comprehensive integrated downhole and topside training simulator enables training the crews on a true representation of the real well to be drilled. This behaves like a "Drilling Flight Simulator", and expected problems downhole can be trained on. Furthermore, the center incorporates an advanced planning system with dynamic models for drilling, cementing, displacements and other well related hydraulics as well as multi-phase flows during well control. Also a state-of-the-art drill string and torque & drag model is included. A Real-Time simulation and decision support module provides support during drilling. The drilling simulation is driven by real time data from the ongoing operation itself, and includes a 3D visualization of the downhole drilling in a "virtual well". Automatic look-ahead simulations of ECD and temperatures was performed with the calibrated models on the fly as support for decisions. A unique feature of the Simulation applications is that the modelling basis and simulation models are the same for planning, for training, for Real Time and for Post-analysis. These are advanced transient state-of-the-art models which have been verified versus numerous well types (HPHT, DW, MPD etc). In preparation, an advanced training session was performed using a dynamic downhole training simulator linked to a topside rig simulator, for training of the drilling teams. Prior to operation data transfer was established so that during the operation simulations was performed in real time using the ongoing operational parameters as input. This paper will first present the Advanced Drilling Simulation and Engineering Center, then elaborate on the use of this in the planning phase, the training phase and the

关键词： Three dimensional computer graphics

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The PDI facial animation system for ANTZ 98

The PDI facial animation system for ANTZ

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ACM SIGGRAPH 98 conference abstracts and applications

作者： Beth Hofer Pacific Data Images Palo Alto CA

No abstract available.

ISBN: (纸本)9781581130461

No abstract available.

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