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16th IEEE Int Conf on High Performance Computing and Communications/11th IEEE Int Conf on Embedded Software and Systems\6th Int symposium on Cyberspace Safety and Security

作者： Li, Feng An, Hong Liang, Weihao Li, Xiaoqiang Cheng, Yichao Jiang, Xia Univ Sci & Technol China Sch Comp Sci & Technol Hefei Peoples R China

ISBN: (纸本)9781479961238

Graphics processing units(GPUs) provide a low cost platform for accelerating high performance computations. New programming languages, such as CUDA and OpenCL, make GPU programming attractive to programmers. However, programming GPUs is still a cumbersome task for two reasons, tedious performance optimizations and lack of portability. First, optimizing an algorithm for a specific GPU is a time-consuming task that requires a thorough understanding of both the algorithm and the underlying hardware. Unoptimized CUDA programs typically only achieve a small fraction of the peak GPU performance. Second, CUDA programs lack performance portability between different GPUs. Moving code from one GPU to another while maintaining the desired performance is a non-trivial task which often requires significant time. In this paper, we propose an optimized compiler that compiles a representative high level directive-based language to CUDA, which is capable of performing a wide variety of optimizations to generate efficient code for GPUs. We alleviate the portability problem of current GPU programming methods by using a high level directive-based language that provides a unified abstraction for currently popular CPU-GPU heterogeneous systems. Various optimizations, mainly the memory system optimizations, are automatically applied by our compiler to produce optimized CUDA code for GPU. Experiments on rodinia benchmark with different input sizes shows that our compiler achieves 70%, 75%, 84% performance of hand-written code on average respectively.

关键词： Compiler Directive-based language GPU Performance optimization Portability

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Polyhedra Associated with Open Locating-Dominating and Locating Total-Dominating Sets in Graphs 6th

Polyhedra Associated with Open Locating-Dominating and Locat...

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6th international symposium on Combinatorial optimization

作者： Argiroffo, Gabriela Bianchi, Silvia Lucarini, Yanina Wagler, Annegret Univ Nacl Rosario Fac Ciencias Exactas Ingn & Agrimensura Rosario Santa Fe Argentina Univ Clermont Auvergne LIMOS UMR 6158 CNRS Clermont Ferrand France

ISBN: (纸本)9783030532611;9783030532628

the problems of determining open locating-dominating or locating total-dominating sets of minimum cardinality in a graph G are variations of the classical minimum dominating set problem in G and are all known to be hard for general graphs. A typical line of attack is therefore to determine the cardinality of minimum such sets in special graphs. In this work we study the two problems from a polyhedral point of view. We provide the according linear relaxations, discuss their combinatorial structure, and demonstrate how the associated polyhedra can be entirely described or polyhedral arguments can be applied to find minimum such sets for special graphs.

关键词： Open locating-dominating code problem Locating total-dominating code problem Polyhedral approach

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A three-dimensional multi-volume analysis of combustible mixture generation due to in-vessel LOCA of ITER using the GASFLOW code

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FUSION ENGINEERING AND DESIGN 2002年第63-64期63-64卷 173-180页

作者： Baumann, W Breitung, W Kaup, B Necker, G Royl, P Travis, JR IKET FZK D-76021 Karlsruhe Germany Pro Sci Ettlingen Germany Ingenieurbuero Du Bois Offenboach Germany

three-dimensional distribution calculations are performed for the ITER-FEAT vacuum vessel (VV), the connected pressure suppression pool (SP) and drain tank (DT). A first-wall coolant leak without plasma shutdown is simulated. the steam, hydrogen, and air sources for this sequence are taken from best-estimate MELCOR calculations. A new extended version Of GASFLOW is used to model the ITER-FEAT specific phenomena in adequate detail. During the accident sequence, hydrogen initially appears only in the VV due to the steam/beryllium reaction. After opening of the valves, steam and hydrogen flow from the W through the connecting lines to the SP and the DT. Because of the ongoing steam condensation occurring in the SP, the pressure there remains permanently at a lower level compared to the other components, resulting in a continuous flow of steam and noncondensable gases into this volume. After 10 500s of steam flow, also air starts entering the W, and an accumulation of N(2) and O(2) takes place in the SP cover gas. Combustible and explosive H(2)-O(2)-N(2) Mixtures exist after 13 600 s, and at 21000 s a stoichiometric H(2)/O(2) ratio has formed, involving 13 kg of hydrogen. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： hydrogen GASFLOW ITER-FEAT

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Dual Gradient Descent EMF-Aware MU-MIMO Beamforming in RIS-Aided 6G Networks 20

Dual Gradient Descent EMF-Aware MU-MIMO Beamforming in RIS-A...

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20th international symposium on Modeling and optimization in Mobile, Ad hoc, and Wireless Networks, WiOpt 2022

作者： Yu, Yi Ibrahim, Rita Phan-Huy, Dinh-thuy Orange Labs Châatillon92320 France

ISBN: (数字)9783903176492

ISBN: (纸本)9783903176492

Reconfigurable Intelligent Surface (RIS) is one of the key technologies for the upcoming 6th generation (6G) communications, which can improve the signal strength at the receivers by adding artificial propagation paths. In the context of Downlink (DL) Multi-User Multiple-Input Multiple-Output (MU-MIMO) communications, designing an appropriate Beamforming (BF) scheme to take full advantage of this reconfigured propagation environment and improve the network capacity is a major challenge. Due to the spatial dimension provided by MIMO systems, independent data streams can be transmitted to multiple users simultaneously on the same radio resources. It is important to note that serving the same subset of users over a period of time may lead to undesired areas where the average Electromagnetic Field Exposure (EMFE) exceeds regulatory limits. To address this challenge, in this paper, we propose a Dual Gradient Descent (Dual-GD)-based Electromagnetic Field (EMF)-aware MU-MIMO BF scheme that aims to optimize the overall capacity under EMFE constraints in RIS-aided 6G cellular networks. © 2022 IFIP.

关键词： Reinforcement learning

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Performance comparison of linear MMSE and coherent RAKE receivers in multipath asynchronous Random-CDMA

Performance comparison of linear MMSE and coherent RAKE rece...

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2000 IEEE 6th international symposium on Spread Spectrum Techniques and Applications (ISSSTA 2000)

作者： Mirbagheri, Arash Yoon, Young C. Univ of Waterloo Waterloo Canada

this paper investigates the design of a linear minimum mean square error (MMSE) receiver for interference suppression in asynchronous random code-division multiple-access (Random-CDMA) systems, such as IS-95 and Wideband-CDMA (WCDMA), operating in multipath environments. Its performance is compared with that of the coherent RAKE receiver. the figure of merit is average output signal-to-noise-ratio (SNR). the proposed receiver maximizes SNR and considers all the desired user's paths unlike the standard RAKE receiver which selects a subset of them. the performance improvement is supported and quantified by numerical examples. the achieved gain is shown to be substantial in non-uniform power conditions (typical of next-generation CDMA systems) and dense multipath environments where the signals are received via many paths. the chip pulse shape is the square-root raised cosine (Sqrt-RC) pulse with 22% excess bandwidth.

关键词： code division multiple access

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A Differential Evolution Tuned Nonlinear Backstepping Controller for three-Phase Grid-Connected Photovoltaic System 6

A Differential Evolution Tuned Nonlinear Backstepping Contro...

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6th IEEE international Women in Engineering (WIE) Conference on Electrical and Computer Engineering (WIECON-ECE)

作者： Panwar, Aditi Kumar, Rajesh Mahmud, M. A. Saxena, Akash Malaviya Natl Inst Technol Dept Elect Engn Jaipur 302017 Rajasthan India Deakin Univ Sch Engn Waurn Ponds Vic 3216 Australia Swami Keshvanand Inst Technol Dept Elect Engn Jaipur 302017 Rajasthan India

ISBN: (纸本)9781665419178

this paper presents an alternative technique to improve the gain tuning of nonlinear backstepping controller applied to three-phase grid-connected photovoltaic (PV) system in order to control active and reactive power fed into the grid. Gain parameters of nonlinear backstepping controllers play a key role in the convergence of currents corresponding to active and reactive power in grid-connected PV systems. the use of Differential Evolution (DE) optimization technique is proposed in this work, to obtain the optimised gain parameters while ensuring the fast convergence of errors associated with currents and this is done by minimizing the fitness function. Meanwhile, the gains are also optimised using an effective DE variant, differential evolution with composite trial vector generation strategies and control parameters (code). the control parameter selection plays a vital role in the efficient performance of DE algorithm. However, the best choice of control parameters for optimum performance varies from problem to problem. Simulation studies are carried out to validate the effectiveness of the proposed scheme in terms of time responses (e.g., rise time, settling time, peak time, etc.)

关键词： Differential evolution gain optimization nonlinear backstepping controller grid-connected photovoltaic systems

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Declarative data generation with ProbLog 15

Declarative data generation with ProbLog

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6th international symposium on Information and Communication Technology, SoICT 2015

作者： Dries, Anton KU Leuven Dept. of Computer Science Celestijnenlaan 200A - bus 2402 Heverlee3001 Belgium

ISBN: (纸本)9781450338431

In this paper we describe a novel declarative approach to data generation based on probabilistic logic programming. We show that many data generation tasks can be described as a probabilistic logic program. To this end, we extend the ProbLog language with continuous distributions and we develop a simple sampling algorithm for this language. We demonstrate that many data generation tasks can be described as a model in this language and we provide examples of generators for attribute-value data, sequences, graphs and logical interpretations and we show how to model common extensions such as noise, missing values and concept drift. © 2015 ACM.

关键词： Logic programming

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Analysis of potential code vulnerabilities involving overlapping instructions

Analysis of potential code vulnerabilities involving overlap...

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international Conference on Computer Safety, Reliability, and Security, SAFECOMP 2017 and 5th international Workshop on Assurance Cases for Software-Intensive Systems, ASSURE 2017, 12th Workshop on Dependable Embedded and Cyber-physical Systems and Systems-of Systems, DECSoS 2017, 6th international Workshop on Next generation of System Assurance Approaches for Safety Critical Systems, SASSUR 2017, 3rd international Workshop on Technical and Legal Aspects of Data Privacy and Security, TELERISE 2017 and 2nd international Workshop on the Timing Performance in Safety Engineering, TIPS 2017

作者： Al Sardy, Loui Tang, Tong Spisländer, Marc Saglietti, Francesca University of Erlangen-Nuremberg Martensstr. 3 Erlangen91058 Germany

ISBN: (纸本)9783319662831

this article proposes approaches supporting the analysis of code vulnerabilities based on overlapping machine instructions of variable length. For the purpose of focusing the search for potential malicious code it is suggested to apply first disassembling techniques allowing for a restriction of potentially exploitable memory space. Successively, testing based on heuristic optimization may be applied in order to evaluate dynamically the practicality of vulnerability exploitation. © Springer international Publishing AG 2017.

关键词： codes (symbols)

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MLCAD 2024 - Proceedings of the 2024 ACM/IEEE international symposium on Machine Learning for CAD

MLCAD 2024 - Proceedings of the 2024 ACM/IEEE International ...

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6th ACM/IEEE international symposium on Machine Learning for CAD, MLCAD 2024

ISBN: (纸本)9798400706998

the proceedings contain 39 papers. the topics discussed include: efficient and effective neural networks for automatic test pattern generation;learning to compare hardware designs for high-level synthesis;FACT: fast and accurate multi-corner predictor for timing closure in commercial EDA flows;enhancing the capabilities of quantum transport simulations utilizing machine learning strategies;AnML-aided approach to automatically generate schematic symbols in PCB EDA tools;IR-aware ECO timing optimization using reinforcement learning;a parallel simulation framework incorporating machine learning-based hotspot detection for accelerated power grid analysis;flip-flop centric incremental placement for simultaneous timing and clock network power optimization;and automated physical design watermarking leveraging graph neural network.

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Design and analysis of the UW-OFDM signal

Design and analysis of the UW-OFDM signal

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international symposium on Communications Control and Signal Processing (ISCCSP)

作者： Heidi Steendam TELIN Dept. Ghent University Belgium

Unique word (UW-) OFDM is a novel multicarrier system that is shown to be suitable for cognitive radio systems. To construct the UW-OFDM signal, a code generation matrix is required to introduce redundancy in the frequency domain, implying that the code generation matrix must satisfy a number of conditions. In this paper, we use an algebraic construction method to separate the conditions imposed by the signal shape from the code design. the degrees of freedom resulting from this construction method are used to optimize different performance measures (i.e., the minimum Euclidean distance and the power) at the transmitter or at the receiver side. Based on the algebraic decomposition, a composite channel can be defined. Irrespective of whether the optimization is done at the transmitter or the receiver, we shown in the paper that always the strongest modes of this composite channel must be excited.

关键词： Euclidean distance Eigenvalues and eigenfunctions Receivers Matrix decomposition Discrete Fourier transforms optimization Transmitters

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