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4th International Conference/Exhibition on high performance computing in the Asia-Pacific Region, HPC-Asia 2000

作者： Wu, Chengyong Hu, Weiping Zhang, Zhaoqing Qiao, Ruliang Center of High Performance Computing Institute of Computing Technology Academia Sinica Beijing100080 China

ISBN: (纸本)0769505902

The structure of intermediate representation (IR) is usually a trade-off between several design considerations in practical compiler systems, and may not be appropriate for expressing the algorithms of some particular phases. On the other hand, conventional designs do not distinguish between the logical view and the physical view of IR. The high-level logic of algorithms is always interwoven with the low-level details operating in the IR. So it is difficult to develop or maintain a compiler or to reuse the code of existing compilers. In an attempt to solve these problems, this paper presents a multi-view IR based on an algebraic data type. © 2000 IEEE.

关键词： Economic and social effects

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The cooling design scheme for the SiPM camera of the LACT experiment

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Journal of Instrumentation 2025年第5期20卷 T05001-T05001页

作者： Wei, Ming Yang, Mingjie Zhang, Shoushan Geng, Lisi Zi, Changge Chang, Jinfan Min, Zhen Liu, Maoyuan Key Laboratory of Cosmic Rays Ministry of Education Tibet University Tibet Lhasa850000 China Key Laboratory of Particle Astrophysics Experimental Physics Division Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China TIANFU Cosmic Ray Research Center Sichuan Chengdu China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China College of Science Tibet University Tibet Lhasa850000 China Department of Physics University of Chinese Academy of Sciences Beijing100049 China China Center of Advanced Science and Technology Beijing100190 China

The LACT experiment will construct 32 six-meter aperture imaging atmospheric Cherenkov telescopes at the LHAASO site for in-depth observation of the ultra-high-energy gamma-ray sources discovered by the LHAASO experiment. The telescope mainly consists of three parts: a support and rotation system, a reflector, and a silicon photomultiplier (SiPM) camera. The SiPM camera is composed of 1616 SiPM sensors connected to 1616 channels of readout electronics. This paper reports on a cooling scheme suitable for the SiPM camera's all-sky rotational working posture in a high-altitude environment, and the effectiveness of the cooling system is verified through thermal simulations and laboratory measurements. © 2025 IOP Publishing Ltd and Sissa Medialab. All rights, including for text and data mining, AI training, and similar technologies, are reserved.

关键词： Solid-state sensors

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FrepJoin:an efficient partition-based algorithm for edit similarity join

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Frontiers of Information technology & Electronic Engineering 2017年第10期18卷 1499-1510页

作者： Ji-zhou LUO Sheng-fei SHI Hong-zhi WANG Jian-zhong LI School of Computer Science and Technology Harbin Institute of Technology Guangdong Key Laboratory of Popular High Performance Computers Key Laboratory of Service Computing and Application

String similarity join(SSJ) is essential for many applications where near-duplicate objects need to be found. This paper targets SSJ with edit distance constraints. The existing algorithms usually adopt the filter-andrefine framework. They cannot catch the dissimilarity between string subsets, and do not fully exploit the statistics such as the frequencies of characters. We investigate to develop a partition-based algorithm by using such *** frequency vectors are used to partition datasets into data chunks with dissimilarity between them being caught easily. A novel algorithm is designed to accelerate SSJ via the partitioned data. A new filter is proposed to leverage the statistics to avoid computing edit distances for a noticeable proportion of candidate pairs which survive the existing filters. Our algorithm outperforms alternative methods notably on real datasets.

关键词： String similarity join Edit distance Filter and refine Data partition Combined frequency vectors

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Collaborative Knowledge Infusion for Low-Resource Stance Detection

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Big Data Mining and Analytics 2024年第3期7卷 682-698页

作者： Ming Yan Tianyi Zhou Joey W.Tsang Ivor Centre for Frontier AI Research and Institute of High-Performance ComputingAgency for Science Technology and ResearchSingapore 138632Singapore

Stance detection is the view towards a specific target by a given context(***,commercial reviews).Target-related knowledge is often needed to assist stance detection models in understanding the target well and making detection ***,prevailing works for knowledge-infused stance detection predominantly incorporate target knowledge from a singular source that lacks knowledge verification in limited domain *** low-resource training data further increase the challenge for the data-driven large models in this *** address those challenges,we propose a collaborative knowledge infusion approach for low-resource stance detection tasks,employing a combination of aligned knowledge enhancement and efficient parameter learning ***,our stance detection approach leverages target background knowledge collaboratively from different knowledge sources with the help of knowledge ***,we also introduce the parameter-efficient collaborative adaptor with a staged optimization algorithm,which collaboratively addresses the challenges associated with low-resource stance detection tasks from both network structure and learning *** assess the effectiveness of our method,we conduct extensive experiments on three public stance detection datasets,including low-resource and cross-target *** results demonstrate significant performance improvements compared to the existing stance detection approaches.

关键词： parameter-efficient learning low-resource stance detection knowledge infusion

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GPS Based Location Oriented Routing Protocol for MANET

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电子学报(英文版) 2006年第1期15卷 173-178页

作者： WANG Kun XU Yinlong HUANG Liusheng CHEN Guoliang Department of Computer Science ＆ Technology University of Science ＆ Technology of China National High Performance Computing Center at Hefei Hefei 230027 China

This paper presents a routing protocol based on Global position system (GPS) called GLOR, in which the geographical area is partitioned into some virtual grids, and in each grid a gateway will be elected to take the responsibility of forwarding packets. Each node needs to monitor the status of all gateways in its communication range. When having packets to send, source first gets destination location by a localization procedure, then chooses the gateway closest to destination as the next hop route, and the intermediate gateways choose routes by the same principle. Some mechanisms for source to track destination are proposed which can magnificently improve the adaptability of GLOR to node movement. The simulation results show that: the performance of GLOR is quite insensitive to both network scale and node speed, and as compared with common protocols, GLOR has significantly lower loss rate, average delay and average cost.

关键词：移动通信网络全球定位系统 GPS 路由协议

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Solving constrained traveling salesman problems by genetic algorithms

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自然科学进展(英文版) 2004年第7期14卷 631-637页

作者： WU Chunguo LIANG Yanchun LEE Heowpueh LU Chun LIN Wuzhong College of Computer Science and Technology Jilin University Key Laboratory for Symbol Computation and Knowledge Engineering Ministry of Education of China Changchun 130012 China Institute of High Performance Computing Singapore 117528 Singapore Institute of High Performance Computing Singapore 117528 Singapore

Three kinds of constrained traveling salesman problems (TSP) arising from application problems, namely the open route TSP, the end-fixed TSP, and the path-constrained TSP, are proposed. The corresponding approaches based on modified genetic algorithms (GA) for solving these constrained TSPs are presented. Numerical experiments demonstrate that the algorithm for the open route TSP shows its advantages when the open route is required, the algorithm for the end-fixed TSP can deal with route optimization with constraint of fixed ends effectively, and the algorithm for the path-constraint could benefit the traffic problems where some cities cannot be visited from each other.

关键词： constrained traveling salesman problem genetic algorithm Hamiltonian path open route fixed end

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Challenge and Methods of Synchronous Disk I/O

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Tsinghua Science and technology 2004年第1期9卷 1-8页

作者：靳超郑纬民汪东升毛昀 Institute of High Performance Computing Technology Department of Computer Science and Technology Tsinghua University Beijing 100084 China

At present, I/O is the performance bottleneck limiting the speed of computer systems. A large number of I/O operations are synchronous read/write operations of only small data blocks. However, reducing the latency of synchronous I/O operation is a non-trivial problem. In this paper, we propose two methods to address this problem. The first method, FastSync, uses a cache disk optimized for write operation via use of a disk-head position prediction algorithm. In this way, disk capacity is traded for synchronous I/O performance. The second method, LND, uses free memory capacity in a network environment as a cache disk for the buffering of synchronous I/O operation. Data integrity in FastSync is ensured by using a data log on the cache disk, whereas in LND, integrity is ensured by the storage in distributed memory of multiple copies of each data block. Both methods succeed in dramatically increasing the performance of synchronous I/O operation. The performance of LND is limited by the network speed, whereas performance of FastSync is determined mostly by the data block size.

关键词： synchronous I/O disk cache network RAM low latency durability persistence Introduction

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Representation of performance Data in Grid Systems

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Tsinghua Science and technology 2004年第4期9卷 410-415页

作者：时培植李三立 High Performance Computing Institute Department of Computer Science and TechnologyTsinghua University Beijing 100084 China

The increasingly frequent exchange of performance data in grid systems across heterogeneous platforms requires a uniform 搑epresentation?of various types of performance data. This paper reviews the current related research, considers the defect of existing methods, and proposes a new portable description method: grid performance data description (GPDD) using an extensible markup language (XML)-based grid performance data representation language (XGPDRL). GPDD describes the abstract structure, which has excellent extensibility (all types of performance data can be described in one format), efficiency, and flexibil-ity. XGPDRL defines the grammar of the GPDD performance data representation, and is both extensible and portable. For benchmarking purposes, performance data can be collected during runtime, represented in XGPDRL, and analyzed visually using a browser across heterogeneous platforms. GPDD and XGPDRL can conveniently ensure data comprehension across various platforms, and are very suitable for grid per-formance data representation.

关键词： performance tool performance data representation grid

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Optimal Bandwidth Utilization of All—Optical Ring with a Converter of Degree 4

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Journal of Computer Science & technology 2002年第4期17卷 411-419页

作者：许胤龙陈国良黄刘生万颖瑜 Department of Computer Science and Technology University of Science and Technology of China National High Performance Computing Center at Hefei Hefei 230027 P.R. China

In many models of all-optical routing, a set of communication paths in a network is given, and a wavelength is to be assigned to each path so that paths sharing an edge receive different wavelengths. The goal is to assign as few wavelengths as possible, in order to use the optical bandwidth efficiently. If a node of a network contains a wavelength converter,any path that passes through this node may change its wavelength. Having converters at some of the nodes can reduce the number of wavelengths required for routing. This paper presents a wavelength converter with degree 4 and gives a routing algorithm which shows that any routing with load L can be realized with L wavelengths when a node of an all-optical ring hosts such a wavelength converter. It is also proved that 4 is the minimum degree of the converter to reach the full utilization of the available wavelengths if only one node of an all-optical ring hosts a converter.

关键词： all-optical network ring wavelength assignment wavelength translation

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An energy-efficient virtual machine scheduler with I/O collective mechanism in resource virtualisation environments

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International Journal of Networking and Virtual Organisations 2013年第4期13卷 311-326页

作者： Xiao, Peng Liu, Dongbo Department of Computer Science High-Performance Computing Center Hunan Institute of Engineering Hunan Province China

Recently, resource virtualisation has been proven effective for deploying large-scale IT-infrastructures, such as grids and clouds. However, many studies also indicate that the system's energy-efficiency will be reduced when I/O virtualisation is involved. In this paper, we present an energy-efficiency enhanced virtual machine (VM) scheduler with aiming at reducing the energy-efficiency losses caused by I/O virtualisation. The proposed VM scheduler is incorporated with an I/O collective mechanism, which separates I/O-intensive VMs from CPU-intensive ones during the runtime and schedules them in a batch manner, so as to reduce the context-switching costs when scheduling intensive mixed workloads. Extensive experiments are conducted on various platforms by using different benchmarks to investigate the performance of the proposed policy. The experimental results indicate that when the virtualisation platform is in presence of mixed workloads, the proposed scheduler outperforms many existing VM schedulers in term of energy-efficiency. Copyright © 2013 Inderscience Enterprises Ltd.

关键词： Virtual machine

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