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Power Efficient Sub-Array in Reconfigurable VLSI Meshes
Ji-Gang Wu,Thambipillai Srikanthan,
Ji-Gang
,Wu,and,Thambipillai,Srikanthan

计算机科学技术学报 , 2005,
Abstract: Given an m × n mesh-connected VLSI array with some faulty elements, the reconfiguration problem is to find a maximum-sized fault-free sub-array under the row and column rerouting scheme. This problem has already been shown to be NP-complete. In this paper, new techniques are proposed, based on heuristic strategy, to minimize the number of switches required for the power efficient sub-array. Our algorithm shows that notable improvements in the reduction of the number of long interconnects could be realized in linear time and without sacrificing on the size of the sub-array. Simulations based on several random and clustered fault scenarios clearly reveal the superiority of the proposed techniques. Ji-Gang Wu has been with Nanyang Technological University (NTU), Singapore, since 2000. He is currently a research fellow in Centre for High Performance Embedded Systems. He received his B.S. degree in computational mathematics from Lanzhou University (China) in 1983 and his Ph.D. degree in computer software and theory from University of Science and Technology of China. He was an assistant professor and lecturer in Lanzhou University from 1983 to 1993. He was an associate professor in Yantai University (China) from 1993 to 2000. His research interests include VLSI design, hardware/software co-design and parallel computing. Thambipillai Srikanthan has been with Nanyang Technological University (NTU), Singapore, since 1991, where he holds a joint appointment as Professor and Director of the Centre for High Performance Embedded Systems. He received his B.Sc. degree (Hons) in computer and control systems and Ph.D. degree in system modelling and information systems engineering from Coventry University, United Kingdom. His research interests include system integration methodologies, architectural translations of compute intensive algorithms, high-speed techniques for image processing and dynamic routing. He is a corporate member of the IEE and a senior member of the IEEE.
New Model and Algorithm for Hardware/Software Partitioning
Ji-Gang Wu,Thambipillai Srikanthan,Guang-Wei Zou,
Ji-Gang Wu
,Thambipillai Srikanthan,and Guang-Wei Zou

计算机科学技术学报 , 2008,
Abstract: This paper focuses on the algorithmic aspects for the hardware/software (HW/SW) partitioning which searches a reasonable composition of hardware and software components which not only satisfies the constraint of hardware area but also optimizes the execution time. The computational model is extended so that all possible types of communications can be taken into account for the HW/SW partitioning. Also, a new dynamic programming algorithm is proposed on the basis of the computational model, in which source data, rather than speedup in previous work, of basic scheduling blocks are directly utilized to calculate the optimal solution. The proposed algorithm runs in O(n A) for n code fragments and the available hardware area A. Simulation results show that the proposed algorithm solves the HW/SW partitioning without increase in running time, compared with the algorithm cited in the literature. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
Approach to Transforming MARTS Sequence Diagram to TTS4SD Models
MARTE顺序图到TTS4SD的转换

ZHU Mei-xia,WU Ji-gang,
朱梅霞
,武继刚

计算机科学 , 2013,
Abstract: The sequence diagram was extended in the MARTE specification for modeling purpose, but it can not be used in the correctness verification stage. The OMG proposes to solve this problem by model transformation techniques; the model A is transformed to a formal model B which is equipped with efficient analysis or verification tools. ho describe the semantics of A by model B can guarantee the bi-simulation relation between them. A model named timed transition system for sequence diagram(TTS4SD)was proposed. At first,we offered the formal syntax of the sectuence diagram and the TTS4SD,then we described the semantics of the sequence diagram by I hS4SD. Taking the semantics as basis,the checking work was carried out on the TTS4SD.An example was given to describe the above process.
Cubeheap and Branch-and-Bound Algorithms
立体堆与分枝界限算法

WU Ji-gang,CHEN Guo-liang,WU Ming,
武继刚
,陈国良,吴明

软件学报 , 2000,
Abstract: 分枝界限算法是解决组合优化问题的常用方法之一.对于给定的问题和分枝策略,算法的运行时间取决于实现算法的数据结构.该文讨论了立体堆及其上的插入、删除算法;通过将分枝界限算法的运作过程与排序过程建立对应关系,给出了一般分枝界限算法的复杂度下界Ω(m+hlogh),其中m为评估的结点数,h为扩展的结点数;得出了立体堆为实现一般分枝界限算法的几乎最优数据结构;并对具体的作业分派问题实现了一个使用立体堆的分枝界限算法;提出了改善立体堆平衡性的措施.
A Nearly Fastest and Asymptotically Optimal General Parallel Branch-and-Bound Algorithm
几乎最快与渐近最优的并行分枝界限算法

WU Ji-gang,JI Yong-chang,CHEN Guo-liang,
武继刚
,计永昶,陈国良

软件学报 , 2000,
Abstract: 分枝界限算法是求解组合优化问题的技术之一,它被广泛地应用在埃运筹学与组合数学中.对共享存储的最优优先一般并行分枝界限算法给出了运行时间复杂度下界Ω(m/p+hlogp),其中p为可用处理器数,h为扩展的结点数,m为状态空间中的活结点数.通过将共享存器设计成p个立体堆,提出了PRAM-EREW上一个新的一般并行分枝界限算法,理论上证明了对于h
Adaptive Fault-tolerant Routing in Torus Networks
Torus网络自适应容错路由算法

DUAN Xin-ming,WU Ji-gang,ZHANG Da-kun,
段新明
,武继刚,张大坤

计算机科学 , 2012,
Abstract: Fault tolerance is one of the most dominant issues for the design of interconnection networks of large-scale multiprocessor systems.A new fault tolerant routing algorithm for wormhole torus network was proposed.The routing algorithm provides enough adaptability so that it is always connected as long as fault regions do not disconnect the network.In spite of the variety of fault components in torus,the proposed routing algorithm is always connected and deadlock-free.At the same time,the proposed algorithm only employs extra three virtual channels.The result of simulation shows that the proposed routing algorithm is of feasibility of gracefully degraded operation.
Improved Algorithm for Communication Synchronization on Reconfigurable Mesh with Faults
可重构阵列的同步性能优化算法

ZHANG Yuan-rui WU Ji-gang DUAN Xin-ming,
张元瑞
,武继刚,段新明

计算机科学 , 2012,
Abstract: Fault tolerant technique for reconfigurable multiprocessor array deals with the issue of reconstruction of the processor array which contains fault units to get the largest available target array. Previous research focused primarily on the reconfiguration algorithm, which does not involve in the study of the synchronous communication performance for reconstructed target array. This paper proposed an optimization algorithm which can improve the performance of the synchronous communication on target array as it reduces the communication delay between neighboring rows for the target array. Experimental results show that the proposed algorithm achieves improvement on communication synchro- nous performance on processor arrays with different scales and different fault densities.
Study on Mechanical Properties and Blood Compatibility of Carbon Nitride Film Deposited on NiTi Alloy
LIU Min,WANG Ji-Gang
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.00491
Abstract: Ti/CNx (x .26), as well as Ti/DLC (Diamond-Like Carbon) and Ti/TiN gradient films were deposited on NiTi alloy substrates using DC (direct current) magnetron sputtering method. The mechanical properties concerning hardness and cohesion of the above three films were tested by using microhardness tester and scratch tester, respectively. The surface hydrophilicities of the three films were measured using contact angle measurement. The blood compatibilities of the substrate and the films were evaluated by hemolysis test and platelet adhesion test. The results indicate that the cohesion between Ti/CNx film and NiTi alloy substrate is excellent (63.6N). The hardness of the CNx film (23.01GPa) is nearly equal to that of the TiN film, which is somewhat higher than that of the DLC films. The results of surface hydrophilicity test and platelet adhesion test demonstrate that the hydrophilicity and blood compatibility of NiTi alloy are improved effectively by the modification with the Ti/CNx film. In comparison with Ti/TiN and Ti/DLC gradient films, Ti/CNx film has the minimum hemolysis ratio of 1.12%. Among the above gradient films, the Ti/CNx film has the best blood compatibilities, as indicated by the minimum amount of conglutinated platelets and the least deformation.
ISOLATION AND CHARACTERIZATION OF A MARINE CHAETOCEROS MUELLERI VIRUS
一株海洋牟勒氏角毛藻(Chaetoceros muelleri)病毒的分离与初步鉴定

WU Qing-Xi,CHENG Kai,YANG Ji-Fang,CHEN Ji-Gang,ZHAO Yi-Jun,XU Min,
吴庆喜
,程 凯,杨季芳,陈吉刚,赵以军,许 敏

海洋与湖沼 , 2011,
Abstract: Water from Xiangshan harbor and the East China Sea were collected and concentrated by backflushing ultrafiltration, and then were used as infecting medium for growing marine red-tide algae as host. A novel virus named Chaetoceros muelleri virus was found that lysed C. muelleri. The virus was isolated by repeated liquid infection and a stable Phycoviruses-Host system of algae was established. Infection via Most-Probable-Number analysis revealed that the virus had a strong infectious power; it was found significantly infectious even after 108-fold dilution. The virus was purified through saccharose gradient ultracentrifugation. Phosphotungstic acid negative staining analysis revealed the viral capsid of C. muelleri virus had a distinct icosahedral shape with a diameter of 58nm. Electron microscopic section revealed that there were many free particles and some assembled viral particles ready to be released in the infected algae cells. Identification of the host range confirmed that the virus had a strict host specificity for C. muelleri cells but not others. This novel C. muelleri virus genome is about 23kb through molecular characterization. No known report for this virus, it is a novel marine phycovirus worthy to be studied.
Isolation and Identification of Acholeplasma sp. from the Mud Crab, Scylla serrata
Ji-Gang Chen,Dan Lou,Ji-Fang Yang
Evidence-Based Complementary and Alternative Medicine , 2011, DOI: 10.1155/2011/209406
Abstract: For the first time, a mollicute-like organism (MLO) was cultured from moribund mud crabs (Scylla serrata) during an outbreak of clearwater disease in Zhejiang Province, China. The MLO displayed a fried-egg colony morphology in culture, did not possess a cell wall, and was not retained by 0.45? m and 0.2? m filters. It was able to ferment glucose, sucrose, lactose, and maltose, but it did not utilize arginine and urea. The MLO grew in the absence of bovine serum and was not susceptible to digitonin. Sequence analysis of the 16S?rRNA gene revealed that this MLO had 99% identity with Acholeplasma laidlawii PG-8A, which indicates that the organism isolated from mud crabs is a member of the genus Acholeplasma. 1. Introduction The class Mollicutes represents a unique category of bacteria, the members of which are characterized by a small cell size, the absence of a cell wall, a reduced genome, and a simplified metabolic pathway [1]. They can be pathogenic or saprophytic and commensal [2]. To date, mollicutes have been observed and identified in many vertebrate, insect, and plant hosts [2]. Mollicutes also have been reported from several aquatic animals, such as fish [3], shrimp [4–8], crab [9], oyster [10], crayfish [11, 12], and bryozoan [13, 14]. However, mollicutes of aquatic animals, especially those of crustaceans, have not been studied extensively. Only a few mollicutes associated with crustaceans have been isolated, purified, and had their taxonomic status confirmed [4, 9]. The mud crab, Scylla serrata (Forska), traditionally called the green crab, is an economically important marine species cultured in the Chinese provinces of Zhejiang, Fujian, Guangdong, Guangxi, and Hainan. Since the 1990s, the S. serrata aquaculture industry has experienced rapid growth. However, the industry also is facing increasing economic losses caused by the outbreak of various diseases, such as sleeping disease (SD) [15] and milk disease [16]. In 2005, an epidemic of clearwater disease (CD) broke out in Zhejiang Province. The symptoms of this disease included debility, weak grip strength of pincers, hydroabdomen, white carapace, drying of gill filaments, and weak blood coagulation capacity. The estimated mortality at the affected farms was ~80%. Mollicute-like organisms (MLOs) together with reo-like viruses (unpublished data) have been implicated as causes of CD. However, the MLO has not been isolated and cultivated, thus the precise taxonomic status and pathogenesis of the MLO in S. serrata have been unclear. In this study, the MLO from mud crabs showing signs of CD was
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