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2003-2017 全部
为您找到包含“National Natural Science Foundation of China”的内容共1294

Lu Yinfeng,Zhang Xiaohong

As a generalization of BCI-algebras with condition (S) and pseudo-BCK algebras with condition (pP), the notion of pseudo-BCI algebras with condition (pP) is introduced. An example of pseudo-BCI algebras with condition (pP) is given, the result that every anti-grouped pseudo-BCI algebras is with condition (pP) is proved. Some properties of pseudo-BCI algebras with condition (pP) are investigated and the branch properties of pseudo-BCI algebras with condition (pP) are discussed.

2010-10-09

Ningbo National Natural Science Foundation of China(Grant No. 2009A610078

National Natural Science Foundation of China (Grant No. 60775038

Faculty of Sciences, Ningbo University,Faculty of Sciences, Ningbo University

#Mathematics#

0评论(0 分享(0)

LI Lei,YU Jia

In recent years, the multi-document summary technology has gotten more and more attention in the field of natural language processing. However, the relationship between the topics and the level information are rarely considered, and sentence scoring is also a very important and difficult task in the multi-document summary process. The results of hLDA (hierarchical Latent Dirichlet Allocation) in the hierarchical topic modeling have been widely validated. Therefore this paper focused on the nodes in the hLDA model, researched the hLDA and semantic based sentence scoring method and presented seven algorithms to provide a strong basis for the multi-document summary.

2013-10-29

National Natural Science Foundation of China (No.61202247

National Natural Science Foundation of China (No.71231002

School of Computer Science, Beijing University of Posts and Telecommunications, 100876,School of Computer Science, Beijing University of Posts and Telecommunications, 100876

#Computer Science and Technology#

0评论(0 分享(0)

Jiangang Peng,Zhihua Lv,Jing He,Lei Tong

On the basis of multi-system risk factors CreditRisk+ model based on sector character, this paper takes account of the variation of loss given default, and proposes the CreditRisk+ model on severity variation and sector correlation of multi-system risk factors. This new model fully takes account of the correlation between the sector risk factors and the variation of the obligor’s loss given default, so the accuracy of calculating unexpected loss of loan portfolio with this model is enhanced. In this paper, we give a practical example to analyze this feasibility of the new model by taking use of saddlepoint approximation algorithm.

2009-04-08

National Natural Science Foundation of China(70673021

Research Center of Financial Management, Hunan University,Research Center of Financial Management, Hunan University,Research Center of Financial Management, Hunan University,Research Center of Financial Management, Hunan University

#Economics#

0评论(0 分享(0)

Wen Zhicheng,Fu Mingfu,Chen Liangsen

In the present paper, the Lagrangian finite plasticity theory is discussed based on the theory of materials with elastic range by the assumptions of the existence of a yield functional and a flow rule, to generalize the framework of A.E. Green, P.M. Naghdi and J. Casey (see Naghdi(1990), Brown et al (2003)), so that it can describe better the mechanical behaviors of anisotropic elastic-plastic materials and the strain induced anisotropy. Here the plastic strain, also called intermediate strain, is defined by the plastic stress, and the elastic response functional is assumed to be a functional of plastic strain history. As a result of this definition of intermediate strain, the elastic response functional has a special form, the normal flow rule of generally accepted Il’yushin’s Postulate is the evolution law for the plastic stress. If the plastic stress is also defined to describe the kinematical hardening, it is the kinematical hardening law. The definitions of strain, plastic strain and elastic strain are discussed from a geometric point of view. It is shown that Green-Naghdi elastic strain is the Lagrange elastic strain. The discussion of the consequences of Il’yushin’s Postulate has detailed, the necessary and sufficient condition is obtained. The rate-form of this theory is obtained. The material symmetry and strain induced anisotropy are also discussed in detail. Finally an example of isotropic elastic plastic materials is given. It has been shown that in general this model can satisfy the basic conditions such as Il’yushin postulate and uniqueness and existence of solution of flow rule for any plastic deformation.

2009-01-08

National Natural Science Foundation of China(10272055

University of Kentucky,School of Architectural Engineering, Nanchang University,School of Architectural Engineering, Nanchang University

#Mechanics#

0评论(0 分享(0)

sun chen

Orthogonal Frequency Division Multiple Access (OFDMA) has already been the main multiple access technology for 3G long term evolution(LTE) and 4G.This paper analyzes characteristics of OFDMA multiple access technology and puts forward a new OFDMA handover algorithm (sub-carriers bidirectional arrayed handover algorithm, SBA). The simulation results show that, during handover process, SBA algorithm proposed in this paper guarantees users in OFDMA system keeping the best channel SIR and QoS. Moreover, SBA algorithm decreases the extra consumption of the handover, and improves OFDMA system performance.

2009-02-09

he National Natural Science Foundation of China (60672131

beijing university of posts and telecommunications,Information & Electronics Technology Lab

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

Yu Xiangqing ,Bian Hai ,Ge Qin ,Wang Wenxiu ,Yang Zhen ,Zhang Limin ,Liu Zhengmin

The study on hydrogen absorption and desorption properties of titanium under an initial hydrogen pressure of 0.25 MPa at different temperature was fulfilled, the hydrogen absorption rate constant k value is 7.364×10-3s-1 under an initial hydrogen pressure of 0.25 MPa at 773 K. The depth profile of hydrogen in titanium was performed by secondary ion mass spectroscopy, the relative hydrogen content is invariable between about 700nm and 1250nm in titanium. The X-ray diffraction and scanning electron microscope studies on titanium hydride were performed, the TiH phase was found after hydrogen desorption of titanium at 773 K after heating for 5400 seconds.

2008-11-18

the National Natural Science Foundation of China( 10605011

School of Nuclear Science and Technology,Lanzhou University,School of Nuclear Science and Technology,Lanzhou University,School of Nuclear Science and Technology,Lanzhou University,School of Nuclear Science and Technology,Lanzhou University,School of Nuclear Science and Technology,Lanzhou University,School of Nuclear Science and Technology,Lanzhou University,School of Nuclear Science and Technology,Lanzhou University

#Nuclear Science and Technology#

0评论(0 分享(0)

Liu Qiao

We study trace operators in weighted variable exponent Sobolev spaces $W^{1,p(x)}(Omega; v_0, v_1)hookrightarrow L^{q(x)}(partial Omega;w)$ for sufficiently regular unbounded domain $Omega subseteq mathbb{R}^{N}$ $(N geq2)$ with noncompact boundary, where $p(x)$ is a Lipschitz continuous function defined on $Omega$ satisfying $10$, the trace operators $W^{1,p(x)}(Omega; v_0, v_1)$ $hookrightarrow$ $L^{q(x)}(partial Omega;w)$ is compact under certain conditions on weight functions $v_0$, $v_1$, $w$.

2007-11-05

the National Natural Science Foundation of China(10671084

Department of Mathematics, Lanzhou University, Lanzhou

#Mathematics#

0评论(0 分享(0)

Lin Zhengyan,Li Degui

A robust version of local linear regression smoothers augmented with variable bandwidth is considered for random design regression models in which errors depend on predictors as well as on unobservable latent variables. The weak and strong consistency of the local linear M-estimators are proved under some regular conditions. Furthermore, asymptotic normality of the local linear M-estimators is established under short range and long range dependence.

2007-05-15

National Natural Science Foundation of China(10571159

Specialized(20060335032

Department of Mathematics, Zhejiang University ,Department of Mathematics, Zhejiang University

#Mathematics#

0评论(0 分享(0)

LI Xiangpeng,WANG Shiying,ZHANG Chunhui

To solve the design problem of transformer composed of none-resonance structure in ultrasonic gear-horning, force coupling conditions for medium thick annular plate(MTAP) and catenary horn are proposed, and the frequency equations of the transformer, which consists of MTAP and horn, are derived based on Mindlin's theory. Then, the design parameters of the transformer are got by solving the frequency equations with the help of MATLAB and demonstrated by modal analysis of finite element method, the resonant frequencies and vibration modes are consistent with each other. The transformer design can be extended from thin annular plate to MTAP as the theoretical method.

2011-09-22

National Natural Science Foundation of China (No: 50975191),Innovation and Entrepreneurial Projects for College Students

College of Mechanical Engineering, Taiyuan University of Technology,College of Mechanical Engineering, Taiyuan University of Technology, Shanxi, 030024, P. R. China,College of Mechanical Engineering, Taiyuan University of Technology, Shanxi, 030024, P. R. China

#Mechanical Engineering#

0评论(0 分享(0)

YANG Yang,XIANG Zhengrong

In this paper, considering the capacitance equivalent series resistance (ESR) and load resistance which due to running conditions caused by the factors such as parameters change, Boost converters are mainly discussed. When the range of changes for uncertain parameters is not very large, Boost converters of small signal model with uncertain parameters still can be built. After building the model, based on linear matrix inequality (LMI) and Lyapunov stability theorem, sufficient conditions of robust stabilization for Boost converters are obtained. According to the uncertain parameters are unknown but bounded, Robust state feedback controllers are designed. Finally, the numerical simulations have verified the validity of this method.

2011-10-09

National Natural Science Foundation of China under(Grant No. 60974027

School of Automation, Nanjing University of Science and Technology,School of Automation, Nanjing University of Science and Technology, Nanjing210094

#Information Science and System Science#

0评论(0 分享(0)