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共 2747 条记录，以下是281-290 订阅

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GPU parallelization and Optimization of a Combustion Simulation Application

GPU Parallelization and Optimization of a Combustion Simulat...

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IEEE international conference on High Performance Computing and Communications (HPCC)

作者： Zhixiang Liao Yongzhou Liu Yonggang Che State Key Laboratory of High Performance Computing Institute for Quantum Information College of Computer National University of Defense Technology Changsha China

Graphics processing units (GPUs) are widely used in the area of scientific computing. While GPUs provide much higher peak performance, efficient implementation of real applications on the GPU architectures is still a non-trivial task. It is crucial to realize efficient solution algorithms that can better utilize GPU architectures. this paper presents our efforts in parallelizing and optimizing LESAP, a CFD application for scramjet combustion simulation, on NVIDIA GPUs. the GPU parallelization is realized based on the CUDA programming model, with a data-parallel implicit time-marching method that is efficient on the GPU architecture. Furthermore, shared memory and redundant calculation are proposed to reduce memory access overhead during GPU computation, and data transfer between CPU and GPU is optimized by packing the data to be transferred. the experimental results show that the GPU version, when runs on four V100 GPUs, achieves a speedup of 11.26 times compared to the CPU version that runs on two 24-core Intel Skylake Gold 6240R CPUs. Excellent parallel scalability across multiple GPUs is also observed.

关键词： Gold Smart cities Computational modeling Graphics processing units Computer architecture Combustion Central processing Unit

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Exploring Memory Access Techniques for Efficient FPGA based 3D CNN Accelerator Design

Exploring Memory Access Techniques for Efficient FPGA based ...

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IEEE international conference on Artificial Intelligence Circuits and Systems (AICAS)

作者： Fatima Hameed Khan Muhammad Adeel Pasha Shahid Masud Department of Electrical Engineering Lahore University of Management Sciences (LUMS) Lahore Pakistan

ISBN: (数字)9798350383638

ISBN: (纸本)9798350383645

Recent advancements in 3D Convolutional Neural Network (CNN) architectures have demonstrated superior performance across diverse computer vision tasks, albeit with a trade-off of intense computational and memory demands. thus, the tiling of incoming data becomes mandatory for 3D CNN acceleration in memory-constrained platforms such as Field Programmable Gate Arrays (FPGA). In this paper, different memory access techniques are explored to reduce the data traffic between on-chip and off-chip memories during the inference stage of a 3D CNN. the most suitable data traffic mode is identified by considering multiple parameters like latency, on-chip memory utilization and off-chip memory access. A parameterized and modular design approach for 3D CNNs has been implemented on an FPGA, where the input and weight data mapping modules are designed to minimize the on-chip memory requirements. these modules are parameterized for variable tiling sizes and different memory access modes while the main computation is performed on a systolic-array-based pipelined architecture. the experiments conducted on three widely adopted 3D networks, I3D, C3D, and R(2+1)D, have shown 16%, 28%, and 10% improvement in latency respectively. the proposed methodology also results in a lower energy dissipation profile.

关键词： three-dimensional displays Memory management Random access memory parallel processing Logic gates Hardware System-on-chip

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Recommending Database architectures for Social Queries: A Twitter Case Study 17th

Recommending Database Architectures for Social Queries: A Tw...

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17th IFIP WG 12.5 international conference on Artificial Intelligence Applications and Innovations (AIAI) / 6th 5G-PINE Workshop / AI-BIO Workshop / DAAI Workshop / DARE Workshop / EEAI Workshop / 10th MHDW Workshop

作者： Marountas, Michael Drakopoulos, Georgios Mylonas, Phivos Sioutas, Spyros Univ Patras CEID Patras 26504 Hellas Greece Ionian Univ Dept Informat Kerkyra 49100 Hellas Greece

ISBN: (纸本)9783030791520;9783030791506;9783030791490

Database deployment is a complex task depending on a multitude of operational parameters such as anticipated data scaling trends, expected type and volume of queries, uptime requirements, replication policies, available budget, and personnel training and experience. thus, enterprise database administrators eventually rely on various performance metrics in conjunction to existing company policies in order to determine the best possible solution under these constraints. the recent advent of NoSQL databases, including graph databases such as Neo4j and document stores like MongoDB, added another degree of freedom in database selection since for a number of years relational databases such as PostgreSQL were the only available technology. In this work the scaling characteristics of a representative set of social queries executed on virtual machine installations of PostgreSQL and MongoDB are evaluated on a large volume of political tweets regarding Brexit. Moreover, Wiener filters for predicting the execution time of social query windows of fixed length over both databases are designed.

关键词： Database administration Database evaluation Signal processing for databases Information engineering Social network analysis

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parallel Software Testing Sequence Generation Method Target at Full Covering Tested Behaviors 19th

Parallel Software Testing Sequence Generation Method Target ...

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19th international conference on algorithms and architectures for parallel processing (ICA3PP)

作者： Sun, Tao Wan, Xiaoyun Zhong, Wenjie Guo, Xin Zhang, Ting Inner Mongolia Univ Coll Comp Sci Hohhot 100021 Inner Mongolia Peoples R China

ISBN: (纸本)9783030389611;9783030389604

parallel software system testing is very difficult because the number of states expands sharply caused by parallel behaviors. In this paper, a testing sequence generation method is proposed, target at full covering tested behaviors and related behaviors over all execution paths. Because of state spaces of parallel software systems are often large, this paper focuses on the state space subgraph, contained all firing of tested and related behaviors, of system model. Firstly, the software system is modeled with Colored Petri Net (CPN), called system model (SM), and every tested behavior or related behavior is modeled also with CPN, called Behavior Model Unit (BMU). then, the method proposes mapping operation, intersection operation, and so on to finally realize the generation of test sequence. Practices show that this method is efficient, which could achieve full coverage.

关键词： parallel software Testing sequence generation Full covering Tested behaviors Colored Petri Net (CPN)

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Formation Control of Multiple Aerial Robots Using LSTM-based Model Predictive Control

Formation Control of Multiple Aerial Robots Using LSTM-based...

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RSI/ISM international conference on Robotics and Mechatronics (ICROM)

作者： Mohammad Amin Najafqolian Khalil Alipour Roujin Mousavifard Bahram Tarvirdizadeh Department of Mechatronics Engineering Advanced Service Robots (ASR) Laboratory Faculty of New Sciences and Technologies University of Tehran Tehran Iran

ISBN: (纸本)9781665454537

this paper proposes a Long Short-Term Memory- (LSTM-) based Model Predictive Control (MPC) design for the formation of multi-agent Unmanned Aerial Vehicles (UAVs). the quadrotor model is considered nonlinear and there are not any simplifying assumptions therefore, the results are more reliable and the proposed method is applicable. A cascade controller with a position controller as the main loop and an attitude controller as the inner loop is presented to address the formation control problem. An LSTM network is used as the estimator to predict the future states of each quadrotor, and the Differential Evolution (DE) finds the optimal value of inputs to satisfy constraints and decrease tracking errors. In addition to the online learning ability, the proposed controller could overcome environmental or structural disturbances, uncertainties, and noises. Furthermore, close-loop stability analysis is studied. In the end, simulation examples are given to prove the acceptability of the presented control structure.

关键词： Uncertainty Simulation parallel processing Autonomous aerial vehicles Stability analysis Formation control Reliability

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An Upper Bound for Sorting Rn with LRE 10th

An Upper Bound for Sorting Rn with LRE

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10th international Advanced Computing conference, IACC 2020

作者： Kuppili, Sai Satwik Chitturi, Bhadrachalam Ravella, Venkata Vyshnavi Datta, C. K. Phani Department of Computer Science and Engineering Amrita Vishwa Vidyapeetham Amritapuri India Department of Computer Science University of Texas at Dallas Richardson TX United States

ISBN: (纸本)9789811604034

A permutation π over alphabet Σ= 1, 2, 3, …, n, is a sequence where every element x in Σ occurs exactly once. Sn is the symmetric group consisting of all permutations of length n defined over Σ. In = (1, 2, 3, …, n) and Rn= (n, n- 1, n- 2, …, 2, 1 ) are identity (i.e. sorted) and reverse permutations respectively. An operation, that we call as an LRE operation, has been defined in OEIS with identity A186752. this operation is constituted by three generators: left-rotation, right-rotation and transposition (1,2). We call transposition (1,2) that swaps the two leftmost elements as Exchange. the minimum number of moves required to transform Rn into In with LRE operation are known for n≤ 11 as listed in OEIS with sequence number A186752. For this problem no upper bound is known. OEIS sequence A186783 gives the conjectured diameter of the symmetric group Sn when generated by LRE operations [1]. the contributions of this article are: (a) the first non-trivial upper bound for the number of moves required to sort Rn with LRE;(b) a tighter upper bound for the number of moves required to sort Rn with LRE;and (c) the minimum number of moves required to sort R10 and R11 have been computed. Here we are computing an upper bound of the diameter of Cayley graph generated by LRE operation. Cayley graphs are employed in computer interconnection networks to model efficient parallel architectures. the diameter of the network corresponds to the maximum delay in the network. © 2021, Springer Nature Singapore Pte Ltd.

关键词： parallel architectures

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Verification of Envelope Tracking Concepts for High Frequency TCM/ZVS in Two-Level AC/DC Converter Applications

Verification of Envelope Tracking Concepts for High Frequenc...

引用

international conference on Power Electronics and Motion Control (IPEMC)

作者： thomas Langbauer Martin Scheffauer Franz Vollmaier David Menzi Roberto Petrella Architectures & Topologies Division Power Electronics Silicon Austria Labs GmbH Graz Austria Power Electronic Systems Laboratory ETH Zurich Zurich Switzerland Packaging & Multiphysics Division Power Electronics Silicon Austria Labs GmbH Villach Austria Dipartimento Politecnico di Ingegneria e Architettura (DPIA) Università degli Studi di Udine Udine Italy

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

Triangular current mode (TCM) enables the benefit of zero voltage switching, but it is accompanied by two significant functional limitations. Initially, it often requires expensive FPGA, ASIC, and/or specialized hardware-based sensing. Secondly, the time delays linked with such sensing and processing can lead to a trade-off between the achievable switching frequency and the precision of the triangular inductor current waveform. this paper delivers the experimental verification of an alternative method where the inductor current envelopes are measured using straightforward analog quasi-peak detectors. the sampling rate needed for these envelopes is in first approximation independent of the applied switching frequency. the control behavior is mainly unaffected by time and signal delays due to the low frequency envelope signals being used, allowing for an affordable standard DSP to implement the proposed method. Importantly, the same control loop can also facilitate continuous conduction mode (CCM) operation, whereby a normal CCM operation at constant switching frequency and a mode with variable switching frequency and constant ripple current can be featured. Using a standard two-level grid-tied inverter configuration as a case study, this paper shows a measurement based verification of the concept of the envelope tracking-based TCM (E-TCM) and CCM (E-CCM) method. A prototype is presented to demonstrate the behavior of an envelope tracking hardware solution, including a measurement-based evaluation of the proposed circuits in operation with a 0.5 kVA, two-level SiC-based converter. this converter, together with its envelope tracking circuit, is capable of operating in TCM at frequencies up to several hundred kHz and can dynamically transition to CCM during operation.

关键词： Control design Tracking Switching frequency Current measurement Zero voltage switching Frequency conversion Sensors

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FANG: Fast and Efficient Successor-State Generation for Heuristic Optimization on GPUs 19th

FANG: Fast and Efficient Successor-State Generation for Heur...

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19th international conference on algorithms and architectures for parallel processing (ICA3PP)

作者： Koester, Marcel Gross, Julian Krueger, Antonio Saarland Informat Campus Campus D3-2 D-66123 Saarbrucken Germany

ISBN: (纸本)9783030389918;9783030389901

Many optimization problems (especially nonsmooth ones) are typically solved by genetic, evolutionary, or metaheuristic-based algorithms. However, these genetic approaches and other related papers typically assume the existence of a neighborhood or successor-state function N(x), where x is a candidate state. the implementation of such a function can become arbitrarily complex in the field of combinatorial optimization. Many N(x) functions for a huge variety of different domainspecific problems have been developed in the past to solve this general problem. However, it has always been a great challenge to port or realize these functions on a massively-parallel architecture like a Graphics processing Unit (GPU). We present a GPU-based method called FANG that implements a generic and reusable N(x) for arbitrary domains in the field of combinatorial optimization. It can be customized to satisfy domainspecific requirements and leverages the underlying hardware in a fast and efficient way by construction. Moreover, our method has a high scalability with respect to the number of input states and the complexity of a single state. Measurements show significant performance improvements compared to traditional exploration approaches leveraging the CPU on our evaluation scenarios.

关键词： Heuristic search Combinatorial optimization Successor-state generation Neighborhood exploration Massively-parallel processing Graphics processing units GPUs

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A Distributed Framework for Online Stream Data Clustering 20th

A Distributed Framework for Online Stream Data Clustering

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20th international conference on algorithms and architectures for parallel processing (ICA3PP)

作者： Ding, Jiafeng Fang, Junhua Chao, Pingfu Xu, Jiajie Zhao, PengPeng Zhao, Lei Soochow Univ Dept Comp Sci & Technol Suzhou Peoples R China Univ Queensland Brisbane Qld Australia

ISBN: (纸本)9783030602451;9783030602444

the recent prevalence of positioning sensors and mobile devices generates a massive amount of spatial-temporal data from moving objects in real-time. As one of the fundamental processes in data analysis, the clustering on spatial-temporal data creates various applications, like event detection and travel pattern extraction. However, most of the existing works only focus on the offline scenario, which is not applicable to online time-sensitive applications due to their low efficiency and ignorance of temporal features. In this paper, we propose a distributed streaming framework for spatial-temporal data clustering, which accepts various clustering algorithms while ensuring low resource consumption and result correctness. the framework includes a dynamic partitioning strategy for continuous load-balancing and a cluster-merging algorithm based on convex hulls [10], which guarantees the result correctness. Extensive experiments on real dataset prove the effectiveness of our proposed framework and its advantage over existing solutions.

关键词： Real-time cluster analysis Distributed stream processing Spatial-temporal data mining Top-k query parallel computing

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Automatic Optimization of Python Skeletal parallel Programs 19th

Automatic Optimization of Python Skeletal Parallel Programs

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19th international conference on algorithms and architectures for parallel processing (ICA3PP)

作者： Loulergue, Frederic Philippe, Jolan No Arizona Univ Sch Informat Comp & Cyber Syst Flagstaff AZ 86011 USA IMT Atlantique LS2N INRIA UBL Nantes France

ISBN: (纸本)9783030389918;9783030389901

Skeletal parallelism is a model of parallelism where parallel constructs are provided to the programmer as usual patterns of parallel algorithms. High-level skeleton libraries often offer a global view of programs instead of the common Single Program Multiple Data view in parallel programming. A program is written as a sequential program but operates on parallel data structures. Most of the time, skeletons on a parallel data structure have counterparts on a sequential data structure. For example, the map function that applies a given function to all the elements of a sequential collection (e.g., a list) has a map skeleton counterpart that applies a sequential function to all the elements of a distributed collection. Two of the challenges a programmer faces when using a skeleton library that provides a wide variety of skeletons are: which are the skeletons to use, and how to compose them? these design decisions may have a large impact on the performance of the parallel programs. However, skeletons, especially when they do not mutate the data structure they operate on, but are rather implemented as pure functions, possess algebraic properties that allow to transform compositions of skeletons into more efficient compositions of skeletons. In this paper, we present such an automatic transformation framework for the Python skeleton library PySke and evaluate it on several example applications.

关键词： Algorithmic skeletons Program transformation Python

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