期刊文献+
共找到60篇文章
< 1 2 3 >
每页显示 20 50 100
FINDING POTENTIAL LIGANDS FOR PDZ DOMAINS BY TAILFIT, A JAVA PROGRAM 被引量:5
1
作者 Hai-mingHuang LingZhang +3 位作者 Qing-huaCui Tian-ziJiang Su-canMa You-heGao 《Chinese Medical Sciences Journal》 CAS CSCD 2004年第2期97-104,共8页
Objective To deduce all potential ligands undiscovered experimentally by searching all the proteins containing same C-termini, which can bind a certain PDZ domain. Methods We developed a JAVA program for searching sho... Objective To deduce all potential ligands undiscovered experimentally by searching all the proteins containing same C-termini, which can bind a certain PDZ domain. Methods We developed a JAVA program for searching short exact sequence matches at C-terminus. According to the known C-termini, which PDZ domains recognized experimentally, Swissprot database has been searched by this program for all potential ligands. Results Some PDZ domains may have more potential ligand proteins, which are undiscovered yet experimentally. These bioinformatic results also provide clues for studying functions of hypothetical proteins and PDZ domains’ protein interactions in many different organisms. Conclusion The results may provide useful clues for discovering potential functions of hypothetical proteins and new functions of known proteins. 展开更多
关键词 PDZ domain protein-protein interactions Tailfit JAVA
下载PDF
The Reduced-order Design of Robust Adaptive Backstepping Controller 被引量:5
2
作者 WUZhao-Jing XIEXue-Jun ZHANGSi-Ying 《自动化学报》 EI CSCD 北大核心 2005年第4期543-548,共6页
For a class of systems with unmodeled dynamics, robust adaptive stabilization problemis considered in this paper. Firstly, by a series of coordinate changes, the original system is re-parameterized. Then, by introduci... For a class of systems with unmodeled dynamics, robust adaptive stabilization problemis considered in this paper. Firstly, by a series of coordinate changes, the original system is re-parameterized. Then, by introducing a reduced-order observer, an error system is obtained. Basedon the system, a reduced-order adaptive backstepping controller design scheme is given. It is provedthat all the signals in the adaptive control system are globally uniformly bounded, and the regulationerror converges to zero asymptotically. Due to the order deduction of the controller, the design schemein this paper has more practical values. A simulation example further demonstrates the e?ciency ofthe control scheme. 展开更多
关键词 简化次序 自适应控制 动力学 仿真技术
下载PDF
The Orders of Automorphism Group of p^6 Rank Groups 被引量:5
3
作者 张新政 王勇 班桂宁 《Chinese Quarterly Journal of Mathematics》 CSCD 2003年第4期369-377,共9页
In this paper, we determine the order of automorphism group of p-groups in the third family ( Φ 3) and the fourth family ( Φ 4) in [1], whose order is p^6(p≥3). Here p denotes an odd prime.
关键词 P-GROUP meta-Abelian group automorphism group definite relation
下载PDF
Modeling and Analysis of Single Machine Scheduling Based on Noncooperative Game Theory 被引量:3
4
作者 WANGChang-Jun XIYu-Geng 《自动化学报》 EI CSCD 北大核心 2005年第4期516-522,共7页
Considering the independent optimization requirement for each demander of modernmanufacture, we explore the application of noncooperative game in production scheduling research,and model scheduling problem as competit... Considering the independent optimization requirement for each demander of modernmanufacture, we explore the application of noncooperative game in production scheduling research,and model scheduling problem as competition of machine resources among a group of selfish jobs.Each job has its own performance objective. For the single machine, multi-jobs and non-preemptivescheduling problem, a noncooperative game model is established. Based on the model, many prob-lems about Nash equilibrium solution, such as the existence, quantity, properties of solution space,performance of solution and algorithm are discussed. The results are tested by numerical example. 展开更多
关键词 单机时序 NASH平衡 工作计划 工作目标 自动化技术
下载PDF
INTEGRATION OF CELL FORMATION AND LAYOUT DESIGN IN THE UNIDIRECTIONAL LOOP MATERIAL HANDLING ENVIRONMENT 被引量:3
5
作者 LeiDeming WuZhiming 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2005年第2期286-289,共4页
A two-phase approach is proposed to deal with the integration problem in theloop layout. Tabu search is applied to cell construction in phase 1 to minimize the inter-cell flow,and the heuristic for layout design is us... A two-phase approach is proposed to deal with the integration problem in theloop layout. Tabu search is applied to cell construction in phase 1 to minimize the inter-cell flow,and the heuristic for layout design is used as phase 2 to optimize the sum of intra-cell andinter-cell transportation cost. The final computational results demonstrate the validation of thetwo-phase approach. 展开更多
关键词 Unidirectiona loop Cell formation Layout design Tabu search
下载PDF
一种基于加权性能指标的多模型辨识算法及其在热工过程中的应用 被引量:3
6
作者 薛振框 李少远 《自动化学报》 EI CSCD 北大核心 2005年第3期470-474,共5页
Most existing algorithms for identifying multi-model system are based on minimizing the square of bias between global outputs of the actual system and the identified model, but the resultant model lacks of robustness.... Most existing algorithms for identifying multi-model system are based on minimizing the square of bias between global outputs of the actual system and the identified model, but the resultant model lacks of robustness. In order to solve this problem, this paper considers some other algorithms in which local models are identified independently and presents a multi-model identification algorithm based on weighted cost function, which uses the idea of local weighted regression and local approximation while keeps the model structure of global identification algorithm. The result of application to a 300MW unit boiler superheater illustrates that the multi-model generated by the proposed algorithm has better trade-off between global fitting and local interpretation. 展开更多
关键词 加权性能指标 多模型辨识算法 热工过程 非线性模型
下载PDF
Advanced control of walking-beam reheating furnace 被引量:6
7
作者 ZhigangChen ChaoXu +2 位作者 BinZhang HuiheShao JianminZhang 《Journal of University of Science and Technology Beijing》 CSCD 2003年第4期69-74,共6页
Rehearing furnace is an important device with complex dynamic characteristicsin steel plants. The temperature tracing control of reheating furnace has great importance both tothe quality of slabs and energy saving. A ... Rehearing furnace is an important device with complex dynamic characteristicsin steel plants. The temperature tracing control of reheating furnace has great importance both tothe quality of slabs and energy saving. A model-based control strategy, multivariable constrainedcontrol (MCC) for the reheating furnace control is used. With this control method, the furnace istreated as a six-input-six-output general model with loops coupled in nature. Compared with thetraditional control, the proposed control strategy gets better temperature tracing accuracy andexhibits some energy saving feature. The simulation results show that the performance of the furnaceis greatly improved. 展开更多
关键词 reheating furnace model predictive control dynamic model MULTIVARIABLE
下载PDF
A Note on Polynomials Based Image Registration 被引量:2
8
作者 黄凤荣 胡占义 《自动化学报》 EI CSCD 北大核心 2005年第2期188-194,共7页
It is shown that the polynomials based image registration, which is widely used in remote sensing field, does not have a sound mathematical basis. In fact, there seems no theoretical basis for the polynomials based tr... It is shown that the polynomials based image registration, which is widely used in remote sensing field, does not have a sound mathematical basis. In fact, there seems no theoretical basis for the polynomials based transform to outperform the affine transformation, a much simpler one,in image registration. If the transformation functions are polynomials of order n, the corresponding scene is shown to be in general the intersection of two curved surfaces of order n + 1, in other words,a space curve. In some special cases, the scene is approaching to a plane. To our knowledge, such results did not appear in the literature previously. 展开更多
关键词 多项式转换 图像配准问题 均匀转换 单应性 转换函数
下载PDF
Motion Control Algorithms for a Free-swimming Biomimetic Robot Fish 被引量:2
9
作者 YUJun-Zhi CHENEr-Kui +1 位作者 WANGShuo TANMin 《自动化学报》 EI CSCD 北大核心 2005年第4期537-542,共6页
A practical motion control strategy for a radio-controlled, 4-link and free-swimmingbiomimetic robot fish is presented. Based on control performance of the fish the fish s motion controltask is decomposed into on-line... A practical motion control strategy for a radio-controlled, 4-link and free-swimmingbiomimetic robot fish is presented. Based on control performance of the fish the fish s motion controltask is decomposed into on-line speed control and orientation control. The speed control algorithm isimplemented by using piecewise control, and orientation control is realized by fuzzy logic. Combiningwith step control and fuzzy control, a point-to-point (PTP) control algorithm is proposed and appliedto the closed-loop experimental system that uses a vision-based position sensing subsystem to providefeedback. Experiments confirm the reliability and e?ectiveness of the presented algorithms. 展开更多
关键词 运动控制算法 仿生学 运动控制 点到点控制 机器人
下载PDF
Hybrid Visual Servoing Control for Robotic Arc Welding Based on Structured Light Vision 被引量:2
10
作者 XUDe WANGLin-Kun TUZhi-Guo TANMin 《自动化学报》 EI CSCD 北大核心 2005年第4期596-605,共10页
A novel hybrid visual servoing control method based on structured light vision is pro-posed for robotic arc welding with a general six degrees of freedom robot. It consists of a positioncontrol inner-loop in Cartesian... A novel hybrid visual servoing control method based on structured light vision is pro-posed for robotic arc welding with a general six degrees of freedom robot. It consists of a positioncontrol inner-loop in Cartesian space and two outer-loops. One is position-based visual control inCartesian space for moving in the direction of weld seam, i.e., weld seam tracking, another is image-based visual control in image space for adjustment to eliminate the errors in the process of tracking.A new Jacobian matrix from image space of the feature point on structured light stripe to Cartesianspace is provided for dierential movement of the end-e?ector. The control system model is simplifiedand its stability is discussed. An experiment of arc welding protected by gas CO2 for verifying iswell conducted. 展开更多
关键词 混合视觉 机器人 定位焊接 伺服控制
下载PDF
The real time cascade generalized predictive control and application to a boiler circuit system 被引量:2
11
作者 许敏 LiShaoyuan 《High Technology Letters》 EI CAS 2005年第2期193-196,共4页
Boiler-circuit system in a circulating fluidized bed combustion boiler is a complex and typical industrial process with a large lag and time-delay. Conventional PID algorithm can not obtain satisfied performance, espe... Boiler-circuit system in a circulating fluidized bed combustion boiler is a complex and typical industrial process with a large lag and time-delay. Conventional PID algorithm can not obtain satisfied performance, especially in the presence of disturbance. A cascade generalized predictivecontrol (CGPC) strategy, is which the inner loop can restrain the disturbance while the outer loop can eliminate the offset, is proposed in this paper. We develop cascade GPC algorithm instead of conventional PID algorithm in the boiler-circuit system. Simulation on experimental boiler-circuit models of circulating fluidized bed combustion boiler shows strong robustness. 展开更多
关键词 层叠控制系统 防护套 广义性 锅炉 电路系统
下载PDF
Software sensor for slab reheating furnace 被引量:2
12
作者 ZhihuaXiong GuohongHuang HuiheShao 《Journal of University of Science and Technology Beijing》 CSCD 2005年第2期123-127,共5页
It has long been thought that a reheating furnace, with its inherent measurement difficulties and complex dynamics, posed almost insurmountable problems to engineers in steel plants. A novel software sensor is propos... It has long been thought that a reheating furnace, with its inherent measurement difficulties and complex dynamics, posed almost insurmountable problems to engineers in steel plants. A novel software sensor is proposed to make more effective use of those measurements that are already available, which has great importance both to slab quality and energy saving. The proposed method is based on the mixtures of Gaussian processes (GP) with the expectation maximization (EM) algorithm employed for parameter esti- mation of the mixture of models. The mixture model can alleviate the computational complexity of GP and also accords with the changes of operating condition in practical processes. It is demonstrated by on-line estimation of the furnace gas temperature in 1580 reheating furnace in Baosteel Corporation (Group). 展开更多
关键词 Gaussian processes expectation maximization multiple models soft sensor reheating furnace
下载PDF
Robust stabilitv of neutral stochastic interval svstems 被引量:2
13
作者 YuminZHANG YiSHEN XiaoXinLIAO 《控制理论与应用(英文版)》 EI 2004年第1期82-84,共3页
Although interval systems have received a great deal of attention, so far there is few work on neutral stochastic interval systems (NSIS) . The purpose of this paper is to initiate the study of NSIS. Using R^umikhin-t... Although interval systems have received a great deal of attention, so far there is few work on neutral stochastic interval systems (NSIS) . The purpose of this paper is to initiate the study of NSIS. Using R^umikhin-type technique, a sufficient condition of exponential stability on NSIS is given. It is interesting that the NSIS changes into general stochastic interval system when the neutral item disappeared. So the results in this paper generalize some conclusions existed. 展开更多
关键词 Stochastic interval systems Exponential stability Razumikhin-type theorem
下载PDF
Robust H_∞ control for discrete-time polytopic uncertain systems with linear fractional vertices 被引量:2
14
作者 ShaoshengZHOU JamesLAM ShengyuanXU 《控制理论与应用(英文版)》 EI 2004年第1期75-81,共7页
The robust H∞ control problem for discrete-time uncertain systems is investigated in this paper. The uncertain systems are modelled as a polytopic type with linear fractional uncertainty in the vertices. A new linear... The robust H∞ control problem for discrete-time uncertain systems is investigated in this paper. The uncertain systems are modelled as a polytopic type with linear fractional uncertainty in the vertices. A new linear matrix inequality (LMI) characterization of the H∞ performance for discrete systems is given by introducing a matrix slack variable which decouples the matrix of a Lyapunov function candidate and the parametric matrices of the system. This feature enables one to derive sufficient conditions for discrete uncertain systems by using parameter-dependent Lyapunov functions with less conservativeness. Based on the result, H∞ performance analysis and controller design are carried out. A numerical example is included to demonstrate the effectiveness of the proposed results. 展开更多
关键词 Discrete-time systems H∞ control Linear matrix inequality Uncertain systems
下载PDF
Multisensor Distributed Track Fusion AlgorithmBased on Strong Tracking Filter and Feedback Integration^1) 被引量:1
15
作者 YANGGuo-Sheng WENCheng-Lin TANMin 《自动化学报》 EI CSCD 北大核心 2004年第2期244-250,共7页
A new multisensor distributed track fusion algorithm is put forward based on combiningthe feedback integration with the strong tracking Kalman filter. Firstly, an effective tracking gateis constructed by taking the in... A new multisensor distributed track fusion algorithm is put forward based on combiningthe feedback integration with the strong tracking Kalman filter. Firstly, an effective tracking gateis constructed by taking the intersection of the tracking gates formed before and after feedback.Secondly, on the basis of the constructed effective tracking gate, probabilistic data association andstrong tracking Kalman filter are combined to form the new multisensor distributed track fusionalgorithm. At last, simulation is performed on the original algorithm and the algorithm presented. 展开更多
关键词 数据融合 数据关联算法 数据处理 多传感器分布式航迹融合算法 仿真 状态估计
下载PDF
Semantic Units Based Event Detection in Soccer Videos 被引量:1
16
作者 TONGXiao-Feng LIUQing-Shan LUHan-Qing JINHong-Liang 《自动化学报》 EI CSCD 北大核心 2005年第4期523-529,共7页
A semantic unit based event detection scheme in soccer videos is proposed in this paper.The scheme can be characterized as a three-layer framework. At the lowest layer, low-level featuresincluding color, texture, edge... A semantic unit based event detection scheme in soccer videos is proposed in this paper.The scheme can be characterized as a three-layer framework. At the lowest layer, low-level featuresincluding color, texture, edge, shape, and motion are extracted. High-level semantic events aredefined at the highest layer. In order to connect low-level features and high-level semantics, wedesign and define some semantic units at the intermediate layer. A semantic unit is composed of asequence of consecutives frames with the same cue that is deduced from low-level features. Based onsemantic units, a Bayesian network is used to reason the probabilities of events. The experiments forshoot and card event detection in soccer videos show that the proposed method has an encouragingperformance. 展开更多
关键词 事件探测 语言单位 BAYESIAN网络 视频语仪分析
下载PDF
Stochastic Distribution Control of Singular Systems: Output PDF Shaping 被引量:1
17
作者 H.YUE A.J.A.LEPRAND H.WANG 《自动化学报》 EI CSCD 北大核心 2005年第1期151-160,共10页
This paper presents a new algorithm designed to control the shape of the output probability density function (PDF) of singular systems subjected to non-Gaussian input. The aim is to select a control input uk such that... This paper presents a new algorithm designed to control the shape of the output probability density function (PDF) of singular systems subjected to non-Gaussian input. The aim is to select a control input uk such that the output PDF is made as close as possible to a given PDF.Based on the B-spline neural network approximation of the output PDF, the control algorithm is formulated by extending the developed PDF control strategies of non-singular systems to singular systems. It has been shown that under certain conditions the stability of the closed-loop system can be guaranteed. Simulation examples are given to show the effectiveness of the proposed control algorithm. 展开更多
关键词 随机分布控制 单系统 PDF显示输出 动态随机系统 概率密度函数
下载PDF
Intelligent coordinated control of power-plant main steam pressure and power output 被引量:1
18
作者 刘红波 李少远 柴天佑 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2004年第3期350-358,共9页
An intelligent coordinated control strategy has been proposed and successfully applied to a 300MW boiler-turbine unit i. e. Unit 1 of Yuanbaoshan power plant in China. Load following operation of coal-fired boiler-tur... An intelligent coordinated control strategy has been proposed and successfully applied to a 300MW boiler-turbine unit i. e. Unit 1 of Yuanbaoshan power plant in China. Load following operation of coal-fired boiler-turbine unit in the power plant leads to changes in operating points which result in nonlinear variations of the plant variables and parameters. For the variation of operating condition and slowly varying dynamics, an intelligent control scheme has been developed by combining fuzzy self-tuning with adaptive control and auto-tuning techniques. As there exist strong couplings between control loops of main steam pressure and power output in the unit, a new design for static decoupler aimed at decoupling for setpoints and unmeasured pulverized coal disturbance of the system at the same time is presented. Satisfactory industrial application results show that such a control system has enhanced adaptability and robustness to the complex process, and better control performance and high economic benefit have been obtained. 展开更多
关键词 intelligent control boiler-turbine coordinated control fuzzy inference adaptive control static decoupling industrial application.
下载PDF
Automated Separation of Stars and Normal Galaxies Based on Statistical Mixture Modeling with RBF Neural Networks 被引量:1
19
作者 Dong-MeiQin PingGuo Yong-HengZhao 《Chinese Journal of Astronomy and Astrophysics》 CSCD 北大核心 2003年第3期277-286,共10页
For LAMOST, the largest sky survey program in China, the solution of the problem of automatic discrimination of stars from galaxies by spectra has shown that the results of the PSF test can be significantly refined. H... For LAMOST, the largest sky survey program in China, the solution of the problem of automatic discrimination of stars from galaxies by spectra has shown that the results of the PSF test can be significantly refined. However, the problem is made worse when the redshifts of galaxies are not available. We present a new automatic method of star/(normal) galaxy separation, which is based on Statistical Mixture Modeling with Radial Basis Function Neural Networks (SMM-RBFNN). This work is a continuation of our previous one, where active and non-active celestial objects were successfully segregated. By combining the method in this paper and the previous one, stars can now be effectively separated from galaxies and AGNs by their spectra-a major goal of LAMOST, and an indispensable step in any automatic spectrum classification system. In our work, the training set includes standard stellar spectra from Jacoby's spectrum library and simulated galaxy spectra of EO, SO, Sa, Sb types with redshift ranging from 0 to 1.2, and the test set of stellar spectra from Pickles' atlas and SDSS spectra of normal galaxies with SNR of 13. Experiments show that our SMM-RBFNN is more efficient in both the training and testing stages than the BPNN (back propagation neural networks), and more importantly, it can achieve a good classification accuracy of 99.22% and 96.52%, respectively for stars and normal galaxies. 展开更多
关键词 methods: data analysis - techniques: spectroscopic - stars: general - galaxies: stellar content
下载PDF
Traffic control based on dahlin algorithm and neural network prediction in TAM networks
20
作者 ShenWei FengRui ShaoHuihe 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2004年第4期716-722,共7页
The propagation delay in networks has a great adverse effect on rote-based traffic control. This paper proposes the composite control based on Dahlin algorithm feedback control and neural network feedforward predictiv... The propagation delay in networks has a great adverse effect on rote-based traffic control. This paper proposes the composite control based on Dahlin algorithm feedback control and neural network feedforward predictive compensation online for ABR (available bit rate) communication in ATM (asynchronous transfer mode) networks, which can overcome the adverse effect caused by the delay on the control rapidity and stability better. The theoretical analysis and simulation research show that the scheme can make sources respond to the changes of network status rapidly, avoid the congestion effectively and utilize the bandwidth sufficiently. Compared with PID (proportional-integral-derivative) control, cell loss rate is much lower, link utilization rate is much higher, and required buffer capacity is much smaller. 展开更多
关键词 ATM网络 神经网络 交通控制 反馈控制 ABR
下载PDF
上一页 1 2 3 下一页 到第
使用帮助 返回顶部