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Search Results: 1 - 10 of 48828 matches for " Yun-Fei Hu "
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Feng Gao,Yun-Fei Hu,Jin-Long Wang
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812006125
Abstract: The molecule of the title compound, C8H3Cl2FN2, is essentially planar, with a maximum deviation of 0.018 (2) . In the crystal, π–π stacking is observed between parallel quinazoline moieties of adjacent molecules, the centroid–centroid distance being 3.8476 (14) .
NMR Studies of Protein Solution Structures and Dynamics

HU Yun-fei,JIN Chang-wen,

波谱学杂志 , 2009,
Abstract: As one of the major techniques for determining high-resolution protein structures, high-field solution NMR has achieved remarkable developments during the past twenty years. With the advances of advanced spectrometer hardware, NMR pulse techniques and protein labeling strategies, the size of the protein that can be studied by solution NMR now exceeds 25 k, and can reach tens and even hundreds of kilo Dalton. In addition, solution NMR has also been widely used in the studies of protein dynamics, and is the only technology that can be used to probe protein motions at multiple sites simultaneously. In this review, we briefly summarize the methods for studying protein structures and dynamics using solution NMR, accompanied by examples to demonstrate the latest developments in the field.
Apply Ant Colony Algorithm to Search All Extreme Points of Function
Chao-Yang Pang,Hui Liu,Xia Li,Yun-Fei Wang,Ben-Qiong Hu
Computer Science , 2009,
Abstract: To find all extreme points of multimodal functions is called extremum problem, which is a well known difficult issue in optimization fields. Applying ant colony optimization (ACO) to solve this problem is rarely reported. The method of applying ACO to solve extremum problem is explored in this paper. Experiment shows that the solution error of the method presented in this paper is less than 10^-8. keywords: Extremum Problem; Ant Colony Optimization (ACO)
New series involving the zeta function
Wu Yun-Fei
International Journal of Mathematics and Mathematical Sciences , 2001, DOI: 10.1155/s0161171201006603
Abstract: We evaluate sums of certain classes of new series involving the Riemann zeta function by using the theory of the double gamma function and a property of the gamma function. Relevant connections with various known results are also pointed out.
Recent clinical researches on diabetic gangrene in integrated traditional Chinese and Western medicine
WANG Yun-Fei
Zhong Xi Yi Jie He Xue Bao , 2004,
New Limonoids and a Dihydrobenzofuran Norlignan from the Roots of Toona sinensis
Xiao-Jie Dong,Yun-Fei Zhu,Guan-Hu Bao,Feng-Lin Hu,Guo-Wei Qin
Molecules , 2013, DOI: 10.3390/molecules18032840
Abstract: Two new limonoids, toonins A ( 1) and B ( 2), and one new dihydrobenzofuran norlignan, toonin C ( 3), were isolated from the roots of Toona sinensis together with the ten known compounds 4-methoxy-6-(2′,4′-dihydroxy-6′-methylphenyl)-pyran-2-one ( 4), bourjotinolone A ( 5), proceranone ( 6), matairesinol ( 7), 4-hydroxy-3-methoxybenzene-ethanol ( 8), syringic acid ( 9), isoscopoletin ( 10), lyoniresinol ( 11), aloeemodin ( 12), and β-sitosterol ( 13). Their structures were elucidated on the basis of one- and two-dimensional spectroscopic analysis. Isolation of compounds 4, 6– 13 from this plant is reported here for the first time.
Research on Reliability of Knowledge-Updating in A Kind of Network Knowledge System  [PDF]
Jinghu Shen, Zhe Yin, Yun-fei Guo
Intelligent Information Management (IIM) , 2011, DOI: 10.4236/iim.2011.36026
Abstract: The definition of reliability of knowledge-updating in network knowledge resource management system (NKRM system for brief) has been given in this paper, which has important reference value to the evaluation of NKRM system. Besides, two kinds of models in NKRM system have been introduced. And one of the most common methods to improve reliability is the redundant technique. However, reliability and efficiency are inconsistent each other. By treating each knowledge as one part of the system, this paper proposes method of joint reserve of knowledge that may resolve this problem.
Taxonomic and Nomenclacural Notes on the Black-flowered Primulas from China

HU Qi-ring,HAO Gang,DENG Yun-fei,

热带亚热带植物学报 , 2011,
Abstract: The correct name of the black-flowered Primula collected from Zhe-dou Shan, Kanding of Sichuan Province is Primula melanantha (Franch.) C. M. Hu. Taxonomic and nomenclatural confusion about this species were discussed and clarified.
Design and Implementation of High Performance Simulation Platform for Switching and Scheduling

HU Hong-Chao,YI Peng,GUO Yun-Fei,

软件学报 , 2008,
Abstract: Simulation has become a significant way for performance evaluations in switching and scheduling, however,the existing simulation softwares have some limitations in inheritability and cxtcnsibility.Based on the current crossbar switching fabric,by employing system level design method,and object oriented technology,a simulation platform called SPES(switching performance evaluation system)for switching fabrics and scheduling policies' developments are designed and implemented.Input queuing,output queuing,combined input-output queuing and combined input-crosspoint queuing and corresponding scheduling policies arc integrated.Inheritability and extensibility attributes are obtained by designing traffic sources,switching fabrics and scheduling policies separately,and it exhibits good performances for supporting multi-fabric,variable packets sizes and QoS model's simulations.By configuring the platform through a uniform view,users can fulfill their concrete simulation environment.Besides,it can carry out end to end performances' evaluations with little modification.Finally,this paper presents a simulation case based on combined input-crosspoint queuing switch,displaying the good performance of SPES.
Review on multi-agent planning

RAO Dong-ning,JIANG Zhi-hu,JIANG Yun-fei,

计算机应用研究 , 2011,
Abstract: Multi-agent planning (MAP) is a cross field based on automated planning and multi-agent system (MAS). With constantly widen researches in automated planning and continuously deepen researches in multi-agent system, MAP has attracted increasing attentions. So this paper gives a review on MAP, including background knowledge, formalism and methods of distributed planning based on plan repair, plan merge or Markov Decision Process (MDP), and finally summaries the trends in the researches of MAP.
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