检索结果-南通市图书馆

Local connectivity of Julia sets for a family of biquadratic polynomials

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2007年第10期50卷 1477-1492页

作者： Jing L~(1+) Wei-yuan QIU~2 ~1 Department of Basic Education,Shanghai maritime university,Shanghai 200000,china ~2 Department of Mathematics,Fudan university,Shanghai 200433,china Department of Basic Education Shanghai Maritime University Shanghai China Department of Mathematics Fudan University Shanghai China

The local connectivity of Julia sets for the family of biquadratic polynomials f_c(z)= (z^2-2c^2)z^2 with a parameter c is *** is proved that for any parameter c,the boundary of the immediately attracting domain of f_... 详细信息

关键词： biquadratic polynomials Julia sets local connectivity

Feed back Mechanism in Decision Support Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 1997年第2期8卷 53-59页

作者： Sun Zhanshan(Institute of SE. dalian maritime university, 116024, P. R. china) Institute of SE. dalian maritime university 116024 P. R. China

Feedback mechanism is a specific feature of control systems, however, the similarity has been found in decision support systems. Just because of this, the DSS can provide a flexible learning and thinking environment, and help decision maker to solve semistructured and unstructured problems actively and creatively. In this paper, the role and type of the feedback in decision making are discussed from different point of view. This is also true in DSS because it supports decision making. The feedback design, especially the feedback interface design, is described through a case of practice DSS. Based on these points, the feedback mechanism is an important feature of DSS, and it is one of the differences between DSS and MIS.

关键词： Feedback mechanism Decision making Decision support system Feedback interface design.

ON THE COHOMOLOGY OF GENERALIZED RESTRICTED LIE ALGEBRAS

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 1998年第4期19卷 421-432页

作者： SHU BIN (Institute of Applied Mathematics & Physics, Shanghai maritime university, Shanghai 200135, china.) Institute of Applied Mathematics and Physics Shanghai Maritime University Shanghai 200135 China

In [21], generalized restricted Lie algebras, defined over a field F of positive characteristic p, were introduced. In this note their cohomology, especially the so-called generalized restricted cohomology is studies. Some reduction properties are obtained. For graded Cartan type Lie algebras the author determines the first Lie-cohomology groups and the first generalized restricted cohomology groups with the coefficients in the highest weight modules from which all irreducible generalized restricted modules are derived.

关键词： Generalized restricted Lie algebras Generalized restricted Cohomology Lie algebras of Cartan type

Parametric estimation of discretely sampled Gamma-OU processes

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2006年第9期49卷 1231-1257页

作者： ZHANG Shibin,ZHANG Xinsheng & SUN Shuguang School of Management, Fudan university, Shanghai 200433, china Department of Mathematics, Shanghai maritime university, Shanghai 200135, china School of Management Fudan University Shanghai China Department of Mathematics Shanghai Maritime University Shanghai China

The stationary Gamma-OU processes are recommended to be the volatility of the financial assets. A parametric estimation for the Gamma-OU processes based on the discrete observations is considered in this paper. The estimator of an intensity parameter A and its convergence result are given, and the simulations show that the estimation is quite accurate. Assuming that the parameter A is estimated, the maximum likelihood estimation of shape parameter c and scale parameter a, whose likelihood function is not explicitly computable, is considered. By means of the Gaver-Stehfest algorithm, we construct an explicit sequence of approximations to the likelihood function and show that it converges the true (but unkown) one. Maximizing the sequence results in an estimator that converges to the true maximum likelihood estimator and the approximation shares the asymptotic properties of the true maximum likelihood estimator. Some simulation experiments reveal that this method is still quite accurate in most of rational situations for the background of volatility.

关键词： Gamma-OU process transition function Lévy process Lévy density stochastic volatility background driving Lévy process Laplace transformation maximum likelihood estimation

Concentration of Dechlorane Plus in Different Coastal Environment Media in dalian,china

在线全文

学校读者我要写书评

暂无评论

Concentration of Dechlorane Plus in Different Coastal Enviro...

Biotoxicity and Bioaccumulation of Dechlorane Plus to Pseudokirchneriella subcapitata

持久性有机污染物论坛2011暨第六届持久性有机污染物全国学术研讨会

作者： Ning Gong~1,Kuishuang Shao~2,Hongliang Jia~3,Tao Jiang~1,Jie Wang~1,Yifan Li~3,Yeqing Sun~(1*) (1 Institute of Environmental Systems Biology,dalian maritime university,1 Linghai Road,dalian, 116026,P.R.china 2National Marine Environmental Monitoring Center,dalian 116023,china 3 International Joint Research Center for Persistent Toxic Substances(ijrc-pts), dalian maritime university,dalian,116026,china)

*** Dechlorane Plus(DP,CHCl) which has 2 stereoisomers as syn-type and anti-type DP in commercial products,was introduced as a substitute for Dechlorane(Mirex) in the *** has been used as a highly chlorinated flame retardant substituting those that are now internationally regulated under the Stockholm Convention,such as penta- and ***,DP is a high-productionvolume compound with an annual world production of about 5000 tons.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Biotoxicity and Bioaccumulation of Dechlorane Plus to Pseudo...

EXACT ERROR PROBABILITY OF ORTHOGONAL SPACE-TIME BLOCK CODES OVER FLAT FADING CHANNELS

持久性有机污染物论坛2012暨第七届持久性有机污染物全国学术研讨会

作者： Ning Gong 1 ,Kuishuang Shao 2 ,Hongliang Jia 3 ,Jie Wang 1 ,Tao Jiang 1 ,Yeqing Sun 1* ( 1 Institute of Environmental Systems Biology, dalian maritime university, dalian, china, 116026 2 National Marine Environmental Monitoring Center, dalian, china, 116023 3 International Joint Research Center for Persistent Toxic Substances (ijrc-pts), dalian maritime university, dalian, china, 116026)

1. Introduction Dechlorane Plus (DP, C 18 H 12 Cl 12 ), also known as bis (hexachlorocyclopentadieno) cyclooctane, is a polychlorinated cycloaliphatic compound that has been used as a highly chlorinated flame

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Electronics(china) 2007年第4期24卷 462-469页

作者： Xu Feng Yue Dianwu College of Information Engineering Dalian Maritime University Dalian 116026 China State Key Laboratory of Mobile Communications Southeast University Nanjing 210096 China

Space time block coding is a modulation scheme recently discovered for the transmit an- tenna diversity to combat the effects of wireless fading channels. Using the equivalent Single-Input Single-Output (SISO) model, this paper presents closed-form expressions for the exact Symbol Error Rate (SER) and Bit Error Rate (BER) of Orthogonal Space-Time Block Codes (OSTBCs) with M-ary Phase-Shift Keying (MPSK) and M-ary Quadrature Amplitude Modulation (MQAM) over flat un- correlated Nakagami-m and Ricean fading channels.

关键词： Orthogonal Space-Time Block Code (OSTBC) Nakagami-m fading channel Ricean fading channel

Simple generalized restricted modules for graded Lie algebras of Cartan type

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第16期43卷 1336-1340页

作者： SHU Bin Institute of Applied Mathematics & Physics, Shanghai maritime university, Shanghai 200135, china Institute of Applied Mathematics & Physics Shanghai Maritime University Shanghai China

Let %L=X(m:n) (2), X∈{W,S,H,K}% be a simple graded Lie algebra of Cartan type over a field %F% of characteristic p>3. With the aid of Farnsteiner’s generalized reduced Verma module, a connection between the simple G... 详细信息

关键词： Lie algebra of Cartan type generalized restricted module generalized reduced Verma module.

Computational model for perception of objects and motions

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2008年第6期51卷 526-536页

作者： YANG WenLu1,2, ZHANG LiQing1 & MA LiBo1 1 Department of Computer Science and Engineering, Shanghai Jiao Tong university, Shanghai 200240, china 2 Department of Electronic Engineering, Shanghai maritime university, Shanghai 200135, china Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai China Department of Electronic Engineering Shanghai Maritime University Shanghai China

Perception of objects and motions in the visual scene is one of the basic problems in the visual system. There exist 'What' and 'Where' pathways in the superior visual cortex, starting from the simple cells in the primary visual cortex. The former is able to perceive objects such as forms, color, and texture, and the latter perceives 'where', for example, velocity and direction of spatial movement of objects. This paper explores brain-like computational architectures of visual information processing. We propose a visual perceptual model and computational mechanism for training the perceptual model. The compu- tational model is a three-layer network. The first layer is the input layer which is used to receive the stimuli from natural environments. The second layer is designed for representing the internal neural information. The connections between the first layer and the second layer, called the receptive fields of neurons, are self-adaptively learned based on principle of sparse neural representation. To this end, we introduce Kullback-Leibler divergence as the measure of independence between neural responses and derive the learning algorithm based on minimizing the cost function. The proposed algorithm is applied to train the basis functions, namely receptive fields, which are localized, oriented, and bandpassed. The resultant receptive fields of neurons in the second layer have the characteristics resembling that of simple cells in the primary visual cortex. Based on these basis functions, we further construct the third layer for perception of what and where in the superior visual cortex. The proposed model is able to perceive objects and their motions with a high accuracy and strong robustness against additive noise. Computer simulation results in the final section show the feasibility of the proposed perceptual model and high efficiency of the learning algorithm.

关键词： visual perception visual cortex computational model receptive fields simple cells complex cells