OALib Journal期刊

ISSN: 2333-9721




2019 ( 11 )

2018 ( 194 )

2017 ( 198 )

2016 ( 209 )


匹配条件: “DU Xue-hui” ,找到相关结果约44134条。
Multicast routing algorithm based on delegation forwarding for delay tolerant networks

WANG Zhen,DU Xue-hui,

计算机应用研究 , 2011,
Abstract: For the multicast routing problem in delay tolerant networks,this paper proposed a multicast routing algorithm based on delegation forwarding method,and analyzed the requirements for designing multicast routing strategy in detail.Combining with nodes' mobility characteristics,the proposed algorithm redesigned the node's quality and the forwarding criterion between nodes for delegation forwarding method.The node's quality was corresponding to multicast session and the forwarding criterion between nodes was a...
Xue-Hui Zhan
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808029334
Abstract: The title compound, C15H14N2O3, exists in the E configuration with respect to the central methylidene unit. The dihedral angle between the two substituted benzene rings is 22.0 (2)°. Within the molecule there is an intramolecular N—H...O hydrogen bond involving the hydrozide H atom and the O atom of the methoxy substituent on the adjacent phenyl ring. In the crystal structure, molecules are linked through intermolecular O—H...O hydrogen bonds, forming zigzag chains along the b direction.
Variation characteristics of macrobenthos productivity in Daya Bay of South China Sea.

DU Fei-yan,WANG Xue-hui,LI Chun-hou,JIA Xiao-ping,

应用生态学报 , 2008,
Abstract: Based on the 7 cruises survey data collected from 63 research stations in the Daya Bay of South China Sea in January and July 1988 and in March, May, September and December 2004, the variation characteristics of the abundance, biomass, productivity, and P/B value of macrobenthos in the two years were analyzed by using Brey's empirical formula. The results showed that in 2004, the mean productivity and P/B value of macrobenthos in study area were 10.22 g AFDM x m(-2) x a(-1) and 0.85 x a(-1), respectively, being at the medium-high level among the sea areas in China and higher than those in 1988 (7.25 g AFDM x m(-2) x a(-1) and 0.76 x a(-1), respectively), which corroborated the conclusion that the high output system of Daya Bay relied on the fast turnover to maintain its high productivity. The variation characteristics of the productivity and P/B value varied among the four main groups of macrobenthos, and the horizontal distribution of macrobenthos productivity also had a greater variation. The regional differences of the productivity and P/B value were closed related to human activities, and the areas in which the productivity varied significantly were intensively affected by human activities.
Congestion control solution to avoid and remove congestion for delay-tolerant network

DU Xue-hui,CHEN Xing-yuan,WANG N,CAO Li-feng,
,陈性元,王 娜,曹利峰

计算机应用研究 , 2013,
Abstract: In delay-tolerant network (DTN), limited resources (such as buffer, bandwidth etc. ) of nodes are more easily used up, resulting in network congestion and network performance deceasing, because of its network characteristics and custody transfer mechanism. The standard TCP congestion control mechanism is not suitable for DTN. This paper proposed a novel congestion control solution to avoid and remove congestion for DTN. Congestion avoidance built DTN directed multi-path graph, divided and set constrain controls on link load, such as message sending and receiving rate and bandwidth usage, in order to increase the network source usage, according to the definiteness of transfer delay and transfer ability in a period of time short enough. Congestion removing combined storage transformation in nodes and message transfer between nodes, to remove DTN congestion on the basis of node storage resource division. The simulation results indicate that the proposed solution has better performance in message delivery rate, network overhead etc. , than other DTN congestion control mechanisms.
New Near Space Security Handoff Scheme Based on Context Transfer

XU Guo-yu,CHEN Xing-yuan,DU Xue-hui,

计算机科学 , 2013,
Abstract: 针对临近空间中安全切换问题,提出一种新的基于上下文传递的安全切换机制。首先,设计了一种面向临近空间浮空器的切换基站预测算法,以基于多普勒频移技术计算飞行器发生切换的时间与位置,确定切换基站;其次,利用上下文传递机制预先将认证信息发送给切换基站,保证切换过程中通信的可靠性。性能分析与仿真实验表明,该机制通信与计算开销小,强制中断概率低,能够满足临近空间的应用需求。
XML document latent information extractionalgorithm based on D-S evidence theory

CHEN Hua-cheng,DU Xue-hui,CHEN Xing-yuan,XIA Chun-tao,

计算机应用研究 , 2013,
Abstract: Traditional XML document retrieval methods are mainly based on keywords' match, which ignore keywords' semantics and latent information contained in information combination. This paper proposed an algorithm of XML document latent information extraction based on D-S evidence theory. Firstly it used ontology to define the relationships between semantic concepts and the combination mode, and next proposed a retrieval model based on D-S evidence theory. Then it presented the computation of evidence weight, and finally designed a dynamic threshold with plausible function. It solved the problems of uncertainty in semantic match and retrieve of latent information. Furthermore, it presented the algorithm's application in the detection of personal and enterprises' sensitive information in e-government domain. The experiment proves that the proposed algorithm has higher precision and recall.
Macrobenthic community structure in Daya Bay, South China Sea

DU Fei-Yan,WANG Xue-Hui,LI Chun-Hou,ZHANG Han-Hua,JIA Xiao-Ping,

生态学报 , 2009,
Abstract: 利用2004年3月、5月、9月和12月的大型底栖动物定量采样数据,对大亚湾大型底栖动物的群落结构进行研究.结果表明,大亚湾大型底栖动物大致可分为3个群落,分别分布于湾顶及湾中大部分海域、湾中部和湾口海域,湾中部海域群落的变化较为显著.大型底栖动物整体群落结构的季节变化总体较小,但雨季对大型底栖动物群落的影响较大,存在较明显的干湿季差异.大亚湾海域生态环境受到明显的扰动,处于扰动状态中的大型底栖动物群落稳定性较差;湾顶和湾中大部分海域内的群落Ⅰ,为大亚湾的主体群落,以软体动物为主,种类组成单一、季节变化小,以小鳞帘蛤Veremolpa micra和粗帝汶蛤Timoclea scabra 为特征种.该群落的稳定性最差,处于较强烈的扰动之中;稳定分布于湾口的群落Ⅲ稳定性最好,未受到扰动,以多毛类为主,种类组成较为复杂、变化较大;湾中部海域大型底栖动物群落结构变化较为复杂,主要变化区域为马鞭州附近海域.该群落系经强烈的人为扰动后,经次生演替而形成的新群落,其种类组成的季节变化非常显著,各季的种类几乎完全不同,群落的独立性和抗干扰能力均较弱;与1980's相比,大亚湾大部分区域内大型底栖动物基本保持了原有的群落,但群落稳定性大幅下降,群落的分布范围和种类组成发生较大程度的改变,主体群落组成呈明显的简单化趋势.在人类活动影响下,湾内同一区域内群落完全演替、湾中部海域出现新的群落.
{6-[2,5-Bis(chloromethyl)-3,4-dihydroxytetrahydrofuran-2-yloxy]-3-chloro-4,5-dihydroxy-3,4,5,6-tetrahydro-2H-pyran-2-yl}methyl acetate dihydrate
Jing-Yu Zhang,Xue-Hui Hou,Xue-Fen Wu
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536809053173
Abstract: The title compound, C14H21Cl3O9·2H2O, is a disaccharide constructed from a galactose and a fructose. In the molecular structure, the tetrahydrofuran five-membered ring and tetrahydropyran six-membered ring assume envelope and chair conformations, respectively. An extensive O—H...O hydrogen-bonding network occurs in the crystal structure.
Residual Dipolar Couplings and Their Applications in Determination of Protein Structures

LIN Dong-hai,LIU Xue-hui,

波谱学杂志 , 2005,
Abstract: In recent years residual dipolar couplings have been employed to obtain the long-range conformational constraints such as the relative orientations between the chemical bonds in biomolecules for calculation or refinement of three-dimensional structures of proteins and protein complexes in solution This review describes the measurement of residual dipolar couplings using multi-dimensional NMR techniques and their applications in determination of protein structures: refining protein structures, evaluating protein structures, determining the relative orientation between protein domains, obtaining information about ligand conformation and orientation, etc
Three-order form invariance and conserved quantity
Yang Xue-Hui,Ma Shan-Jun,

中国物理 B , 2006,
Abstract: In this paper, the definition of three-order form invariance is given. Then the relation between the three-order form invariance and the three-order Lie symmetry is discussed and the sufficient and necessary condition of Lie symmetry, which comes from the three-order form invariance, is obtained. Finally a three-order Hojman conserved quantity is studied and an example is given to illustrate the application of the obtained results.

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