检索结果-南通市图书馆

A new intelligent prediction system model-the compound pyramid model

在线全文

学校读者我要写书评

暂无评论

science{1.(information sciences) 2012年第3期55卷 723-736页

作者： YANG BingRu , QU wu, WANG LiJun & ZHOU Ying {1. of information Engineering, university of science and technology beijing, beijing 1.0083, china 1. school of {1. Engineering University of Science and Technology Beijing Beijing 100083 China

A current development trend in research on intelligent systems is to optimize a general intelligent prediction system into an individuation intelligent prediction system that is applied in specialized fields. Protein structure prediction is a challenging international issue. In this paper, we propose a new intelligent prediction system model, designed as a multi-layer compound pyramid model, for predicting secondary protein structure. The model comprises four independent intelligent interfaces and several knowledge discovery methods. The model penetrates throughout the domain knowledge, with the effective attributes chosen by Causal Cellular Automata. Furthermore, a high pure structure database is constructed for training. On the RS1.6 dataset, the overall state per-residue accuracy, Q3, reached 83.99%, while on the CB51. dataset, Q3 reached 85.58%. Meanwhile, on the CASP8 sequences, the results are superior to those produced by other methods, such as Psipred, Jpred, APSSP2 and BehairPred. These results confirm that our method has a strong generalization ability, and that it provides a model for the construction of other intelligent systems.

关键词： knowledge discovery intelligent prediction system model compound pyramid model

A variational method for contour tracking via covariance matching

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science{1.(information sciences) 2012年第11期55卷 2635-2645页

作者： wu YuWei,MA Bo & LI Pei {1. Laboratory of Intelligent information technology,school of Computer science,{1. Institute of technology,{1. 1.0081.china 1. beijing Laboratory of Intelligent {1. technology School of Computer Science Beijing Institute of Technology Beijing 100081 China

This paper presents a novel formulation for contour *** model the second-order statistics of image regions and perform covariance matching under the variational level set ***,covariance matrix is adopted as a visual object representation for partial differential equation(PDE) based contour ***-Euclidean calculus is used as a covariance distance metric instead of Euclidean distance which is unsuitable for measuring the similarities between covariance matrices,because the matrices typically lie on a non-Euclidean manifold.A novel image energy functional is formulated by minimizing the distance metric between the candidate object region and a given template,and maximizing the one between the background region and the *** corresponding gradient flow is then derived according to a variational approach,enabling partial differential equations(PDEs) based contour *** on several challenging sequences prove the validity of the proposed method.

关键词： contour tracking covariance region descriptor level set Log-Euclidean Riemannian metric

Optimal Risk Sharing for Maxmin Choquet Expected Utility Model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年第2期40卷 430-444页

作者： De-jian TIAN Shang-ri {1. school of Mathematics China University of Mining and TechnologyXuzhou 221116China

This article analyzes the Pareto optimal allocations,agreeable trades and agreeable bets under the maxmin Choquet expected utility(MCEU)*** provide several useful characterizations for Pareto optimal allocations for risk averse *** derive the formulation descriptions for non-existence agreeable trades or agreeable bets for risk neutral *** build some relationships between ex-ante stage and interim stage on agreeable trades or bets when new information arrives.

关键词： maxmin Choquet expected utility model Pareto optimal allocation agreeable trade agreeable bet

Generalized gradient projection neural networks for nonsmooth optimization problems

在线全文

学校读者我要写书评

暂无评论

science{1.(information sciences) 2010年第5期53卷 990-1005页

作者： LI GuoCheng 1., SONG ShiJi 2 ? & wu Cheng 2 1.Department of Mathematics, {1. information science and technology university, {1. 1.01.2, china 2 Department of Automation, Tsinghua university, {1. 1.0084, china 1. Department of Mathematics Beijing Information Science and Technology University Beijing 100192 China2. Department of Automation Tsinghua University Beijing 100084 China

Generalized gradient projection neural network models are proposed to solve nonsmooth convex and nonconvex nonlinear programming problems over a closed convex subset of R n . By using Clarke’s generalized gradient, the neural network modeled by a differential inclusion is developed, and its dynamical behavior and optimization capabilities both for convex and nonconvex problems are rigorously analyzed in the framework of nonsmooth analysis and the differential inclusion theory. First for nonconvex optimization problems, the quasi convergence results similar to those achieved by previous work are proved. For convex optimization problems, the global convergence results are proved, i.e. any trajectory of the neural network converges to an asymptotically stable equilibrium point, which is an optimal solution of the primal problem whenever it exists. This result remains valid even if the initial condition is chosen outside the feasible set. In addition, an asymptotic control result involving a Tykhonov like regularization shows that any trajectory of the revised neural network can be forced to converge toward a particular optimal solution of the primal problem. Finally, two simulation optimization algorithms for solving the optimization and control problems are designed respectively, and three typical simulation experiments are illustrated to present the accuracy and efficiency of theoretical convergence results of this paper.

关键词： nonsmooth optimization problem generalized gradient projection networks differential inclu sions convergence

An improvement to the data processing course of electrochemical impedance technique

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of university of science and technology beijing 2003年第6期10卷 57-60页

作者： Yinglv jiang, Yinshun {1., and Hong ChuCorrosion and Protection Center, university of science and technology beijing, beijing 1.0083, china Corrosion and Protection Ctr. Univ. of Sci. and Technol. Beijing Beijing 100083 China

For some electrochemical systems the traditional data processing methods cannot be met, so it is necessary to develop a new method to deal with these problems. When processingthe electrochemical AC impedance data of titanium alloy TA1. in 3 percent NaCl solution (at freecorrosion potential, room temperature) a new method is developed which can detach the information ofthe interface resistance demonstrably from the interface capacitance. The results show that theinterface resistance and capacitance are all functions of frequency. And the AC impedance of theresistance and capacitance obey the following relations: C(f) = 1.^(4.01.82) f^(-0.9292), R(f)=1.^(4.8001.) (f+0.008)^(-0.90897), which is completely different from the traditional conceptionthat the interface resistance and capacitance are constants. And this phenomenon is ubiquitous intitanium alloys according to the study. So perhaps it is an innate characteristic of interface.

关键词： titanium alloy electrochemical impedance corrosion

A heuristic path-estimating algorithm for large-scale real-time traffic information calculating

在线全文

学校读者我要写书评

暂无评论

science{1.(Technological sciences) 2008年第S1期51卷 165-174页

作者： L WeiFeng1,ZHU TongYu1,wu DongDong2,DAI Hong3 & HUANG jian1 1 State Key Laboratory for Software Development Environment,Beihang university,beijing 1.0083,china 2 beijing Transportation information Center,beijing 100055,china 3 College of Arts & science,beijing Union university,beijing 1.0083,china 1. State Key Laboratory for Software Development Environment Beihang University Beijing 100083 China 2. beijing Transportation {1. Center Beijing 100055 China 3. College of Arts & science Beijing Union University Beijing 100083 China

As the original Global Position System (GPS) data in Floating Car Data have the accuracy problem,this paper proposes a heuristic path-estimating algorithm for large-scale real-time traffic information calculating. It uses the heuristic search method,imports the restriction with geometric operation,and makes comparison between the vectors composed of the vehicular GPS points and the special road network model to search the set of vehicular traveling route candidates. Finally,it chooses the most optimal one according to weight. Experimental results indicate that the algorithm has considerable efficiency in accuracy (over 92.7%) and com-putational speed (max 8000 GPS records per second) when handling the GPS tracking data whose sampling rate is larger than 1.min even under complex road network conditions.

关键词： path-estimating floating car data (FCD) road network vector GPS

Simulation of RFI Cancellation Using Subspace Projection Algorithm for PAF Receiver

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第1期24卷 237-244页

作者： Peng wu {1. Li Mao-Zheng Chen Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China university of Chinese Academy of {1.s Beijing 100049China Xinjiang Key Laboratory of Microwave {1. Urumqi 830011China

The simulation of radio frequency interference(RFI) cancellation by applying a spatial filtering technique for phased array feed(PAF) is presented. In order to better reflect the characteristics of PAF, a new signal model is to add the coupling coefficient among elements of PAF to the conventional array signal model. Then the subspace projection(SP) algorithm is used to cancel RFI from the correlation matrix of the signal, and finally, the 2D power image is drawn. The power variation of signal-of-interest direction and RFI direction before and after using the SP algorithm is analyzed. The new signal model and simulation strategy can be used to test and verify the beamformer.

关键词： methods:analytical techniques:radar astronomy telescopes

A tracking loop based on tightly coupled range and velocity filter equations

在线全文

学校读者我要写书评

暂无评论

science{1.(information sciences) 2012年第4期55卷 898-910页

作者： CUI Wei,TIAN Jing & wu SiLiang {1. of information and Electronics,beijing Institute of technology,beijing 1.0081.china 1. school of {1. and Electronics Beijing Institute of Technology Beijing 100081 China

A joint range-velocity closed tracking loop,which is based on tightly coupled range and velocity filter is *** the measured velocity value is adopted in the range tracking loop to modify the velocity and acceleration equations from traditional α-β-γ filter,the tracking loop based on tightly coupled range and velocity filter can not only track the range and the velocity simultaneously,but also improve the range tracking *** experimental results show that the tracking errors about range thermal noise in the proposed loop is lower than those in the traditional loop over 2.2 dB,when filter parameters satisfy least mean-square error ***,with the increase of the filter parameter,the tracking performance of our schemes are improved accordingly.

关键词： α-β-γ filter tracking loop thermal noise tracking error tightly coupled range and velocity equations

Flow imaging method of electromagnetic measurement in well logging

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science{1. Earth sciences 2008年第S2期51卷 181-185页

作者： wu XiLing,WANG XiaoXing,ZHAO YanWei & YANG Mei {1. of Resource and information technology,china university of Petroleum,beijing 1.2249,china china Univ Petr Sch Resource & Informat Technol Beijing 102249 Peoples R China

Multiphase flow in an oil well is a dynamic phenomenon of inhomogeneous medium,which should be studied in a nonlinear way. This paper presents an electromagnetic measurement method based on the electrical property differences between oil,gas and water to scan,inverse and show the distribution and condition of multiphase flow. Both numerical simulation and physical experiments have proved that clear images could be obtained by this way.

关键词： well multiphase flow electromagnetic wave flow imaging