Archive

15 July 2007, Volume 28 Issue 7 Previous Issue    Next Issue
---
OriginalPaper


For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

OriginalPaper

Select

Product quality monitoring system for roasting process of shaft furnace Wu, Feng-Hua (1); Yue, Heng (1); Chai, Tian-You (1) 2007, 28 (7):  913-916.  DOI: - Abstract ( 270 )   HTML   PDF (1491KB) ( 568 )   In the hematite ore roasting process of a shaft furnace, the product quality index, namely the magnetic tube recovery rate (MTRR), is difficult to be measured on-line or in real time. Therefore, a quality monitoring system is developed on the basis of RBF neural network and expert system, involving a MTRR prediction model and a product quality diagnosis model. Practical applications show that the proposed system can timely predict the MTRR with great precision and well diagnose the product quality. Furthermore, the way to adjust relevant parameters is suggested for the process to avoid the unqualified products. As a result, the MTRR is increased by 2% with the qualified product improved 50%, thus the product quality of the roasting process of shaft furnace can be efficiently guaranteed. References | Related Articles | Metrics

Select

Impulsive control of unified chaotic system with parameter uncertainty Ma, Tie-Dong (1); Zhang, Hua-Guang (1) 2007, 28 (7):  917-920.  DOI: - Abstract ( 267 )   HTML   PDF (286KB) ( 670 )   An impulsive control scheme for a class of unified chaotic systems with parameter uncertainty is proposed using the linear state feedback as the signal to realize the global asymptotic stability. In addition, some new global asymptotic criteria and their extended forms are presented. Compared with the existing results, less conservative conditions are obtained to guarantee the global asymptotic stability. The controller thus designed is simple and easy to implement at high response speed and available to lay down a theoretical foundation for the applications in chaotic secure communication systems and chaotic spread spectrum of carrier communications. The effectiveness of the method proposed is verified theoretically and simulatively. References | Related Articles | Metrics

Select

Multiobjective non-dominated sorting genetic algorithm with local searching Wang, Xiao-Gang (1); Liang, Shi-Xian (1); Wang, Fu-Li (1) 2007, 28 (7):  921-924.  DOI: - Abstract ( 249 )   HTML   PDF (324KB) ( 852 )   The non-dominated sorting in genetic algorithms (NSGA) has some deficiencies such as the poor local search and premature convergence. An improved algorithm based on the advantage of simulated annealing is presented to overcome these shortcomings. The local search operator of simulated annealing for multiobjective optimization and the jump criteria are taken part into the new algorithm. The local search should be carried out by simulated annealing in the vicinity of the 1st and 2nd rank of non-dominant solutions. This approach can improve operational efficiency and make up for the deficiencies of NSGA. The simulation results show the effectiveness of the algorithm. References | Related Articles | Metrics

Select

Multivariable feedforward decoupling control based on double-level neural network in a fermentation process Chang, Yu-Qing (1); Li, Yu-Chao (3); Lu, Zhe (1); Wang, Fu-Li (1) 2007, 28 (7):  925-928.  DOI: - Abstract ( 258 )   HTML   PDF (329KB) ( 495 )   A double-level neural network for feedforward decoupling control is proposed for the fermentation process characterized with time-variable, nonlinear, uncertain and multivariable coupling. The first-level network aims to build a characteristic model of coupling channel on account of the information on achievable process, and realize the prediction of how the coupling affects the controlled variables; On the other hand, the second-level network aims to build an inverse characteristic model of controlling channel, thus making the compensation output and realizing the decoupling control. Testing results showed that the control performance is better in multivariable fermentation process when based on the double-level neural network feedforward decoupling, thus getting rid of the disadvantage of feedforward decoupling method that not only relies on the exact process model but highly sensitive to the slight variation of parameters. References | Related Articles | Metrics

Select

Non-fragile H∞ guaranteed cost control for uncertain singular systems with multiple time-delay Zhang, Qing-Ling (1); Yuan, Wei (1) 2007, 28 (7):  929-932.  DOI: - Abstract ( 241 )   HTML   PDF (1417KB) ( 599 )   Discusses the design problem of non-fragile guaranteed cost controller for a class of linear multiple time-delay singular systems with structural uncertainties. A linear quadratic cost function is considered as a performance measure. A sufficient condition is given in terms of LMIs (linear matrix inequalities) for the existence of the non-fragile H∞ guaranteed cost controllers in cases of both additive and multiplicative perturbation. The controller guarantees the robust stability of the closed-loop system, and the upper bound of quadratic performance index satisfies the H∞ disturbance attenuation level. A numerical example for both cases is given to illustrate the effectiveness of the theory. References | Related Articles | Metrics

Select

Fault detection and diagnosis for nonlinear time delay systems based on adaptive observer Yin, Zuo-You (1); Zhang, Hua-Guang (1) 2007, 28 (7):  933-936.  DOI: - Abstract ( 280 )   HTML   PDF (199KB) ( 569 )   For the actuator fault of nonlinear dynamic systems with model uncertainty and time delay, a class of adaptive observers are employed under some preconditions to construct several effective residual signals that are required to perform the fault detection and estimate. Based on Lyapunov theory, the design of adaptive observer is analyzed and the adaptive tuning rules are obtained. A simple simulation example was carried out to verify the effectiveness of the proposed method. References | Related Articles | Metrics

Select

MATRIXx-based simulation model base for continuous cold rolling process Qu, Rong-Xia (1); Liu, Xing-Gang (1); Xu, Mei-Rong (1); Zhao, Hui-Ping (2) 2007, 28 (7):  937-940.  DOI: - Abstract ( 270 )   HTML   PDF (225KB) ( 549 )   An attempt has been made to develop a simulation model base for cold continuous rolling process so as to meet the requirements for investigating the controlling parameters in different models. Then the architecture and data structure of the simulation model base are worked out, including the object-oriented hierarchical/modular software system, and the simulation model base is thus formed and implemented by using the MATRIXx simulation platform and the reusable software for I/O dynamic linkage. To simplify the data processing during the simulative computation, the ODBC (open database connectivity) interface is programmed between the model base and database. With industrial data acquired, an analysis is made to some key problems in relation to models by applying the model base in rolling process, and the results reveal the practicality and advantages of the simulation model base as a model research and development platform. References | Related Articles | Metrics

Select

Multi-objective optimization based on improved ant colony algorithm for electric power line overhaul Gao, Li-Qun (1); Yu, Hong-Tao (1); Li, Yang (1); Zhang, Jun-Zheng (1) 2007, 28 (7):  941-944.  DOI: - Abstract ( 262 )   HTML   PDF (217KB) ( 446 )   A multi-objective model is presented according to the comprehensive analysis of the electric power line overhaul in Liaoning province, taking account of various constraints. The coloring problem of graph theory is combined with an improved ant colony algorithm to plan optimally the overhaul. The core of the improved algorithm is to make dynamically the pheromones on routes adaptive so as to enable the increment of pheromones to become great from small to strengthen the ability for local search, and then become small from great to strengthen the ability for global search. Such a cyclical change is thus highly beneficial to an algorithm to get rid of locally optimal solution. The merit of the improved ant colony algorithm is that not only the satisfactory solution is obtained, but also the searching speed is improved. Simulation results showed that the improved ant colony algorithm is superior to the conventional one in quality. References | Related Articles | Metrics

Select

Nonlinear multi-objective group decision for peak load shifting to control power distribution Li, Yang (1); Gao, Li-Qun (1); Yu, Hong-Tao (1); Kong, Zhi (1) 2007, 28 (7):  945-948.  DOI: - Abstract ( 280 )   HTML   PDF (1001KB) ( 555 )   Discusses the interregional control of power distribution during peak loading. An expression of nonlinear explicit function of dissatisfiability is given through analyzing the influencing factors on the dissatisfiability in peak load shifting to control power distribution. Based on the nonlinear multi-objective theory and group decision-making theory, a relevant model is developed for peak load shifting to control power distribution. Then, an interactive multi-objective weighted solution is presented, and the restrained nonlinear planning model is transformed into the model without restraint. Steps of the solution are shown in detail with an example, and the result is satisfactory. References | Related Articles | Metrics

Select

Risk management model based on distributed decision-making for virtual enterprises Huang, Min (1); Sun, Xian-Li (1); Wang, Xing-Wei (1) 2007, 28 (7):  949-952.  DOI: - Abstract ( 241 )   HTML   PDF (195KB) ( 687 )   In view of the virtual enterprises' characteristics, such as the diversity of members and distribution of cooperative regions, the idea of distributed decision-making (DDM) is applied to the management of the virtual enterprises' risks, with an organizational-DDM risk management model developed for those virtual enterprises which are in relation to enforced-team. Describes how to reserve the best risk-controlling funds in accordance to the forecasted risks in different operation stages from the beginning and how to take best measures to control the risk and the investment of each stage especially the specific risk which is possible at a certain operation stage. Discusses the solution to the model. The aim of this paper is to give support and reference for the risk management of virtual enterprises theoretically and practically. References | Related Articles | Metrics

Select

Analysis of decision in promotion by 'sending shopping cards' Zhang, Rui-You (1); Wang, Ding-Wei (1); Chen, Ying-Ying (2) 2007, 28 (7):  953-956.  DOI: - Abstract ( 273 )   HTML   PDF (186KB) ( 445 )   To provide the theoretical support to the decisions made in the wide-spread promotion by sending shopping cards, it is studied preliminarily. Defining some key parameters, such as card's par value and card sending/receiving ratio, the concepts of card's value coefficient, lower-bound value coefficient and depreciation coefficient are proposed with the card's value and the lower-bound value calculated. The reasonable price scope of selling and purchasing shopping cards is thus derived for the firms which will launch the promotion by sending shopping cards during holidays. Different schemes for single purchase in the typical promotion by sending cards are analyzed. A conclusion is drawn that if the prices are reasonable, purchasing a shopping card first for purchasing goods is preferable to paying cash. Moreover, the proposed concepts and formulate could be applied to the analysis of more complex promotion activities by sending shopping cards. References | Related Articles | Metrics

Select

Handoff target prediction scheme in NGI Wang, Xing-Wei (1); Tian, Ye (1); Huang, Min (1) 2007, 28 (7):  957-960.  DOI: - Abstract ( 273 )   HTML   PDF (369KB) ( 665 )   Based on the combination of instant method with statistical method, a target prediction scheme for handoff in NGI is designed by use of statistical prediction and historical handoff record to form a fuzzy decision tree. If there exist several target cells predicted, an instant prediction scheme runs to compute the accessing probability of each and all predicted target cells in accordance to the user's current information such as position, moving speed/direction and average call duration, then the maximum addressing probability is picked out as the handoff target cell. Simulation results showed that the proposed scheme has higher hitting rates at different users' movement speeds in comparison with those schemes simply based on statistical prediction or instant prediction, with a better overall performance provided. References | Related Articles | Metrics

Select

Multi-query overload prediction model for deadline-aware data stream processing Wu, Shan-Shan (1); Gu, Yu (1); Yue, De-Jun (1); Yu, Ge (1) 2007, 28 (7):  961-964+977.  DOI: - Abstract ( 266 )   HTML   PDF (313KB) ( 479 )   To meet the real-time requirements for query processing over data streams, the deadline is defined as the real-time constraint of continuous queries. A multi-query overload prediction model is thus developed for deadline-aware data stream processing. The overload point predicted by the model indicates the critical conditions under which each and all of the queries can meet the requirements of deadline individually. In the circumstance of multiple queries, the overload point is estimated by finding a query as deadline bottleneck. After processing the deadline bottleneck, the processing capability of the residual queries is just higher than the input stream rate, thus working out the overload point. The simulation results showed that the overload point predicted by the model enables each and all of the queries to meet individually the deadline they required, and that the prediction algorithm is accurate and efficient. References | Related Articles | Metrics

Select

Filter-based uniform algorithm for optimizing complex query in wireless sensor network Zhao, Zhi-Bin (1); Li, Bin-Yang (1); Yao, Lan (1); Yu, Ge (1) 2007, 28 (7):  965-968.  DOI: - Abstract ( 469 )   HTML   PDF (1212KB) ( 524 )   Wireless sensor network (WSN) nodes can't gain durable energy supply. Therefore, how to use the limited energy efficiently to prolong the lifetime of nodes becomes an important research problem. Proposes a filter-based uniform algorithm (FBUA) for optimizing Top-k query in WSN. Its basic idea is to provide a filter for each and every node. The filter is essentially a node value fetch interval determined by sample value. When the node gets some new data, it will decide whether to update it in accordance to the filtering rule. Thus, a lot of redundant communications can be shielded to save the energy of node and prolong its lifetime. FbUA can get exact answers to some complex queries in WSN, such as Top-k and k-NN. The experimental results showed that in most cases FbUA could reduce bandwidth consumption by 50%-70%. References | Related Articles | Metrics

Select

Biometric-based random sequence generator Zhang, Xiang-De (1); Zhu, He-Gui (1); Yang, Lian-Ping (1); Tang, Qing-Song (1) 2007, 28 (7):  969-972.  DOI: - Abstract ( 338 )   HTML   PDF (455KB) ( 498 )   The randomness of biometric features including uniqueness, unpredictability, irreproducibility and external noises such as lighting and trauma are all used to develop biometric-based random sequence generators. The generator is discussed in detail with iris as an example. The Canny operator is used to do boundary test with the iris images, then the binaryzed iris images are gotten and the pixel coordinates values (i, j) are fetched as '1' and the random sequence over the interval[-1, 1] can be acquired by the function f(i, j)-cos(i × j). Then, the FIPS 140-1 tests are carried out for the sequences so as to verify the outstanding randomness. The results show that the generator is not only good at randomness, but also simple and easy to implement, in comparison to other similar generators, thus providing a new way to generate true random sequence. References | Related Articles | Metrics

Select

GA-based algorithm for task scheduling on computational grid Ma, Xue-Bin (1); Wen, Tao (1); Guo, Quan (2); Wang, Gang (1) 2007, 28 (7):  973-977.  DOI: - Abstract ( 310 )   HTML   PDF (357KB) ( 1075 )   Task scheduling plays an important role in grid system and has a notable impact on the overall performance. Scheduling problems, as a class of NP (non-deterministic polynomial) problems can get a near optimal solution by classical scheduling approaches in most cases. Although the existing methods of task scheduling based on GA(genetic algorithms) can give better solutions to task scheduling than classical approaches, most of them are used for single task or multiple tasks which are independent on each other. An improved GA is thus proposed for task scheduling on computational grid by combining theoretical analysis with simulation results. What tasks the genetic algorithm deal with may involve many subtasks with contextual constraints and every subtask may require several kinds of resources. A comparison test showed that the genetic algorithm proposed is better than conventional HEFT and DLS algorithms during task scheduling on computational grid. References | Related Articles | Metrics

Select

Orientational filter based on dominant directions in content-based image retrieval Zhang, Gang (1); Ma, Zong-Min (1); Deng, Li-Guo (1); Cai, Zhi-Ping (1) 2007, 28 (7):  978-981.  DOI: - Abstract ( 231 )   HTML   PDF (213KB) ( 477 )   The orientational filter is an integral part of content-based image retrieval, which is now mainly applicable to general image field instead of particular image field. Statistical method and fuzzy set theory are introduced in the clustering analysis which is made for the subsets of the particular image field in each and all directions. The degree of membership is computed according to the results of clustering analysis and used as the weight of the texture characteristic vector in a certain direction, and k dominant directions are determined correspondingly according to the degree of membership. Texture characteristics are thus computed from the k dominant directions and used to form texture characteristic vector. Similarity measure between texture characteristic vectors is computed by means of Euclidean distance. Experiments showed that the texture characteristic vector obtained from π, π/2, 0, 3/2π directions is better than that obtained from the computation of 0, π/4, π/2 and 3/4π in matching precision. Moreover, such an orientational filter is applicable to particular image field. References | Related Articles | Metrics

Select

QoS-Aware multi-objective optimization routing protocol in Ad Hoc networks Geng, Rong (1); Li, Zhe (1); Xu, Xiao (1) 2007, 28 (7):  982-984+1001.  DOI: - Abstract ( 278 )   HTML   PDF (270KB) ( 541 )   The issue of providing QoS in Ad hoc networks was studied. Aiming at existing QoS routing protocols taking no account of the local information such as node load and node collision, the QMOR (QoS-Aware multi-objective optimization routing) protocol is proposed to provide QoS in Ad hoc network, which takes QoS requirement-bandwidth as the parameter of access control, and the algorithm of route discovery/maintenance is just extension of DSR protocol. The routing selection is carried out at the destination node with multi-objective optimization algorithm of which the optimization parameters include path delay, the length of existing packets in buffer and number of retransmissions. Results of simulation showed that the QMOR protocol has better performance than DSR protocol in either static topology or dynamic topology. References | Related Articles | Metrics

Select

Adaptive double ring scheduling strategy based on TinyOS Lin, Kai (1); Zhao, Hai (1); Yin, Zhen-Yu (1); Bi, Yuan-Guo (1) 2007, 28 (7):  985-988.  DOI: - Abstract ( 316 )   HTML   PDF (327KB) ( 469 )   To risk above the deficiency that the operation system of the sensor network, TinyOS, fails in real-time implementation of tasks, an adaptive double ring scheduling (ADRS) strategy is proposed and implemented on TinyOS. Different with a single circular queue and all tasks sharing one stack in FCFS strategy, ADRS designed two circular queues with different priority and all tasks were dispatched to two stacks. And the task shifting between the two queues can be readjusted dynamically according to the time limit for the task in queues, thus ensuring the tasks completed to greatest extent. Simulation results showed that ADRS strategy can maintain its intrinsic performance and improve greatly the effect of the sensor networks in processing the real time tasks. References | Related Articles | Metrics

Select

Accounting management of ATM-based broadband multimedia satellite communication system Jiang, Yue-Qiu (1); Pan, Cheng-Sheng (2); Zhou, Ying (1); Wang, Guang-Xing (1) 2007, 28 (7):  989-992.  DOI: - Abstract ( 232 )   HTML   PDF (837KB) ( 530 )   Network management is one of the most important functions of satellite application system. Aiming at the characteristics of the new-generation broadband multi-media communication satellite system, the function of accounting management as an integral part of the commercial satellite system is studied and an accounting management model is developed base on the charging agent in satellite switchboard. An accounting scheme is thus proposed combining users' conversation with different strategies for service division, throughout and QoS, then a formula is designed for system accounting management, which lay down a foundation for the implementation and applications of the new-generation broadband multi-media satellite communication system. References | Related Articles | Metrics

Select

Analysis of food-chain algorithm and its parameters Yu, Hai-Fei (1); Wang, Ding-Wei (2) 2007, 28 (7):  993-997.  DOI: - Abstract ( 310 )   HTML   PDF (114KB) ( 1319 )   According to the characteristics of colony emergence of artificial organizes and the dynamic interaction between them and environment, the food-chain that is also an important and widespread phenomenon in the life system, and the rules of local activities of artificial organizes at different levels are defined to propose an artificial-life based algorithm referred as the food-chain algorithm. It is such a sort of artificial-life algorithms that optimize the computation by imitating the evolution of natural ecosystem and the information processing mechanism of natural organisms. Describes the definition, idea, and flow of the food-chain algorithm, and discusses the relevant rules of metabolic energy and change in neighborhood where the artificial-life individuals do something. Furthermore, the key parameters of the algorithm are systematically analyzed. The test results showed that the food-chain algorithm has such life-like traits as autonomous, evolutionary, and self-adaptive, which are highly fit for the optimization problems of life-like systems, such as the location-allocation problems of distribution network system. References | Related Articles | Metrics

Select

Effects of low-frequency electromagnetic field on microstructure and macrosegregation of HDC casting 2024 aluminum alloy Zhu, Qing-Feng (1); Zhao, Zhi-Hao (1); Cui, Jian-Zhong (1); Wang, Jing (1) 2007, 28 (7):  998-1001.  DOI: - Abstract ( 238 )   HTML   PDF (305KB) ( 680 )   Investigates experimentally and comparatively the as-cast microstructure and Cu macrosegregation of 2024 Al alloy ingots by HDC (horizontal direct chill) continuous casting process in low-frequency electromagnetic field and those by conventional horizontal continuous casting process, where the cross-sectional area of specimens is 40 mm × 200 mm. The two different specimens were both inspected by optical microscopy and chemically analyzed sampling from their cross-sectional areas. The result showed that the low-frequency electromagnetic field can greatly improve the microstructure with grain refining, and reduce the Cu macrosegregation on cross-sectional area for uniform distribution. References | Related Articles | Metrics

Select

Analysis of forming mechanism of lamination defect of steel plate Li, Yan-Mei (1); Zhu, Fu-Xian (1); Cui, Feng-Ping (2); Fang, Ke (2) 2007, 28 (7):  1002-1005.  DOI: - Abstract ( 585 )   HTML   PDF (411KB) ( 1305 )   To reduce the probability of lamination defect formed during plate steel rolling and improve its quality and mechanical properties specimens of the cold rolled steel plates were nondestructively detected. Then, according to the positions of severe lamination defect found from spectural patterns as the result of detection, the defect, morphologies and compositions of the specimens were analyzed by SEM, etc.. The results showed that the microstructure of lamination defects formed in steel plates are mainly the component of strip/plate sulfides in ferrite bandings distributed along the rolling direction, which is typically the reason why the lamination defects formed. It was concluded that lamination defects can be prevented efficiently if the sulfur content in steel is reduced to below 0.02% and the critical size of sulfides is less than 5 μm. References | Related Articles | Metrics

Select

Form of Cu occurrence and biologic effectiveness for contaminated soil in a smeltery site Yang, Hong-Ying (1); Zhu, Chang-Liang (1); Jiang, Huan-Jie (1); Tong, Lin-Lin (1) 2007, 28 (7):  1006-1008.  DOI: - Abstract ( 297 )   HTML   PDF (515KB) ( 640 )   The form of copper occurrence in contaminated soil in a smeltery site was discussed comparatively by continuous chemical digestion, with the coefficient of biologic effectiveness to copper calculated. The results showed that the distributive form of copper in the copper smelting area is in an order of RES>CA>OM>Fe-Mn>EXC and WS, while in the zinc smelting area the distributive form of copper is in an order of RES>OM>CA>Fe-Mn>EXC and WS. It showed that copper is mostly in the form of residue, i.e., the 63.4% in the soil of smelting area and 38.5% in that of zinc smelting area. The biologic effectiveness coefficients to heavy metals in the soil of both areas are in an order of K3>K2>K1, K2>K3>K1 correspondingly as a calculated result. References | Related Articles | Metrics

Select

Effects of exciter parameters on self-synchronous vibration system Han, Qing-Kai (1); Yang, Xiao-Guang (1); Qin, Zhao-Ye (1); Wen, Bang-Chun (1) 2007, 28 (7):  1009-1012.  DOI: - Abstract ( 309 )   HTML   PDF (386KB) ( 539 )   The dynamic equations of a self-synchronous vibration system driven by two exciters rotating oppositely are deduced taking account of the mechanical characteristics of the two driving motors. By numerical simulation, the effects of the exciters' eccentric torque, motor power and resisting moment due to rotating friction on self-synchronization motion are discussed. The results show that the vibration system can achieve stably synchronous motion if all the exciter parameters are within certain threshold values. The amplitude of vibrating body in y direction is in direct proportion to eccentric torque, thus realizing that the time for stable synchronization is in inverse proportion to eccentric torque. The effect of the rated torque of motor on synchronization is not obvious, while the rotary damping parameter mainly affects the time required to transfer to synchronization. References | Related Articles | Metrics

Select

Biomechanical characteristics of LASIK Liu, Jie (1); Li, Chao-Feng (1); Ma, Hui (1); Wen, Bang-Chun (1) 2007, 28 (7):  1013-1016.  DOI: - Abstract ( 255 )   HTML   PDF (470KB) ( 736 )   Based on the biomechanical and structural characteristics of cornea, a geometrical model of cornea is developed, combining the visualization with finite element method to compute simulatively LASIK (laser in-situ keratomileusis). The Influences of corneal stroma cutting depth, optical zone diameter cut and intraocular pressure (IOP) on operation result are discussed. It is shown that the LASIK operation is unsuitable to those ones whose IOP is high with thin cornea, and a better rectifying effect by LASIK is available to those ones whose optical zone diameter to cut are smaller. The biomechanical analysis made by sophisticated engineering technologies and relevant software is proved highly significant and pragmatic for reference. References | Related Articles | Metrics

Select

Differential quadrature method to analyze stability of elastically-supported fluid conveying pipelines Bao, Ri-Dong (1); Wen, Bang-Chun (1) 2007, 28 (7):  1017-1020.  DOI: - Abstract ( 224 )   HTML   PDF (579KB) ( 1029 )   The differential quadrature method (DQM) is an efficient numerical one to solve the boundary/initial value problems because of its mathematical simplicity, decreased amount of computation, easy programming and high precision. The method is extended to the stability analysis of elastically-supported fluid conveying pipelines. The numerical computation results showed that DQM has a unique merit to the dynamic analysis of the characteristics of the fluid conveying pipelines concerning with the fluid structures interaction (FSI). Discusses the stability of such pipelines under common end constraining conditions and the effects of both torque spring and linear spring coefficients on the pipelines' stability. Some preliminary conclusions are thus drawn involving the design of such pipelines and relevant reliability analysis, which are available for technological reference. References | Related Articles | Metrics

Select

Finite element analysis for tipping behavior of a 40 t steel ladle Li, Qiang (1); Gao, Yao-Dong (2); Wen, Bang-Chun (1); Han, Qing-Kai (1) 2007, 28 (7):  1021-1024.  DOI: - Abstract ( 296 )   HTML   PDF (332KB) ( 850 )   The finite element analysis was made for a 40 t steel ladle with the software ANSYS used as a new way to discuss the tipping motion of ladle and strength calculation. Through modeling, loading, restricting and calculating, the teeming angle of ladle and the change in its centroid, moment of inertia and turning moment during teeming are obtained, as well as in the stress/strain. In this way not only the rational design of products and selection of reliable supporting equipment are available but also the tipping behavior of other similar liquid vessels can be analyzed efficiently according to the analysis made. References | Related Articles | Metrics

Select

Digital control system of active magnetic bearing based on DSP Ren, Shuang-Yan (1); Bian, Chun-Yuan (2); Liu, Jie (1) 2007, 28 (7):  1025-1028.  DOI: - Abstract ( 279 )   HTML   PDF (431KB) ( 803 )   Active magnetic bearing (AMB) is an new-type bearing in which the rotor is suspended in the air gap between it and stator by the controllable electromagnetic force provided by electromagnets and rotates frictionlessly. Describes its construction and operating principle. To gain high-precision control, a mathematical model of AMB is developed with a design scheme given for the hardwares/softwares of AMB control system using DSP (digital signal processor) TMS320 F2812. Discusses the principle of PID (proportional-integral-differential) control of variable parameters with a simulation done to investigate the control scheme of the experimental setup designed. The simulation results showed that the digital control system of AMB has such advantages as high stability, fast response, small even no overshoot and high control precision, thus meeting the requirements of AMB control performance. References | Related Articles | Metrics

Select

Research on fractal SCM of e-Biz companies under networked manufacturing Dong, Hai (1); Wang, Wan-Shan (1); Gong, Ya-Dong (1); Li, Yan-Ping (2) 2007, 28 (7):  1029-1032+1064.  DOI: - Abstract ( 273 )   HTML   PDF (459KB) ( 669 )   Based upon fractal theory, a fractal supply chain serving the functions of self-similarity, self-organization and self-optimization is proposed for high-uncertainty demands of customers of an e-Biz company under networked manufacturing so as to balance dynamically the flexibility and stability in building its supply chain and relevant operation. Describes the conception of fractal supply chain. The nested structure of e-Biz's supply chain and functional module are constructed. Then, the dynamic decision-support models of analyzer and resolver are developed. The numerical example shows that the fractal supply chain can deal well with the complicated relationship between different supply chain's members and control efficiently the uncertainty of supply chain management, thus adapting dynamically to the management system which requires agility, integration and systematization. References | Related Articles | Metrics

Select

Experimental study on acoustic emission measurement and source location for anisotropic rock failure process Wang, Shu-Hong (1); Zhang, Ya-Bing (1); Zhang, Nan (1); Lee, Chung-In (2) 2007, 28 (7):  1033-1036.  DOI: - Abstract ( 313 )   HTML   PDF (1010KB) ( 645 )   With an improved experimental setup for AE (acoustic emission), the AE measurement was carried out for the specimens of anisotropic granite in the deformations/failure process under uniaxial compression. Discusses the initiation of microcracks thus induced and their interaction and propagation during damage/failure. A relative source locating method was introduced into the study on the AE occurrences in anisotropic and heterogeneous rock specimens, which is less dependent on sounding wave velocity. The results showed that the method is available to AE occurrences in complex specimens and engineering rock mass with higher reliability and accuracy than before. And it can offer preliminarily a quantitative analysis of locating the source of rock failure process under the action of external loading, thus benefiting the analyses of other failures of engineering rock mass. References | Related Articles | Metrics

Select

Multi-objective programming model for optimal distribution of water resource in Songyuan city Wu, Wen-Ye (1); Wang, En-De (1); Ni, Qing-Wei (2); Hu, Cheng (2) 2007, 28 (7):  1037-1040.  DOI: - Abstract ( 310 )   HTML   PDF (183KB) ( 772 )   To confirm the project of regional water resource development in a reasonable way so as to promote relevantly the sustainable economic development, a multi-objective programming model is developed for the optimal distribution of water resource in Songyuan city in view of system engineering, according to the present situation of water resource and future goals. With the aim of utilizing water resource reasonably and efficiently, what are required to do include readjusting and optimizing the industrial mix, reducing the number of sectors consuming too much water and supporting preferentially the industries which consume less water than conventional ones with high water availability and aggregate economic benefits. All these suggest an outlook on effective regional water distribution on the basis combining economic and ecologic conditions with social benefits, thus providing an optimized macro-planning to guide regional utilization of water resource and economic growth. It is of far reaching importance to sustainable economic growth and coordinative utilization of water resource. References | Related Articles | Metrics

Select

Study on the characteristic of camsellite flotation Li, Yan-Jun (1); Han, Yue-Xin (1); Zhu, Yi-Min (1) 2007, 28 (7):  1041-1044.  DOI: - Abstract ( 295 )   HTML   PDF (333KB) ( 687 )   The effect of (NaPO3)6 on the flotation performance of magnetite, camsellite and serpentine was investigated through the testings of purity, grain size and surface characteristics of single-block camsellite and its floatation experiments. The results showed that in the oleic acid system the (NaPO3)6 concentration is a critical point, i.e., the (NaPO3)6 suppression effect on magnetite is effective or ineffective if the concentration is lower or higher than 0.25 × 10-4 mol/L, respectively, while in the lauryl amine system the suppression effect is unobvious or obvious if the concentration is lower or higher than 0.8 × 10-4 mol/L, respectively. As to the camsellite, (NaPO3)6 is suppressible to it in oleic acid system but insuppressible in laural amine system. And (NaPO3)6 has no obvious effect on the floatability of serpentine in either oleic acid or lauryl amine systems. Moreover, the suppression effects of starch and Ca2+ on camsellite are discussed. References | Related Articles | Metrics

Select

Calculation of flexural capacity of SRC beams strengthened with FRP Zhou, Le (1); Wang, Lian-Guang (1); Mu, Guang-Bo (1); Li, Sui (2) 2007, 28 (7):  1045-1048.  DOI: - Abstract ( 291 )   HTML   PDF (269KB) ( 930 )   The mechanical properties of SRC beams strengthened with FRP (fiber reinforce polymer) are further investigated theoretically including its failure mechanism and loadability, based on earlier theoretical works on RC beams. The nonlinear stress diagram of the concrete in the state the stress is lower than its ultimate value is transformed into an equivalent rectangular stress diagram, then the relevant parameters m and n are given equivalently. And the correlation equation of flexural capacity on the cross section of SRC beam strengthened with FRP is deduced according to different types of failure. The equation is expressed clear, simple and easy to application. The depth of relative boundary compressive region and the boundary disposition rate of FRP are both given in view of different failure types. References | Related Articles | Metrics

Select

Collaborative replenishment policies based on CPFR Ji, Shou-Feng (1); Cao, Chu (1); Huang, Xiao-Yuan (1) 2007, 28 (7):  1049-1052.  DOI: - Abstract ( 278 )   HTML   PDF (189KB) ( 822 )   Because the information structure of conventional demand forecasting model for supply chain is in discrete state and the prediction structures of individuals are different greatly from each other, the inventory replenishment strategy is seriously affected. So, the policy CPFR (collaborative planning, forecasting and replenishment) is introduced firstly into the study on collaborative replenishment to develop the mathematic models of the function of optimum inventory in terms of optimum delivery period. Then, an evolution strategy (ES) is used to give the solution to the models. The results indicate that total cost increases with increasing parameter values, namely, the optimum delivery period and the optimum inventory are affected with the different parameter values. The conclusion verifies the validity of the policy proposed. References | Related Articles | Metrics

Select

- - 2007, 28 (7):  1053-1056.  DOI: - Abstract ( 259 )   HTML   PDF (318KB) ( 1204 )   - References | Related Articles | Metrics

Select

Method for group decision-making based on linguistic judgment matrices with different granularities Chen, Yan (1); Fan, Zhi-Ping (1); Chen, Xia (1) 2007, 28 (7):  1057-1060.  DOI: - Abstract ( 243 )   HTML   PDF (249KB) ( 553 )   With regard to the group decision-making based on linguistic judgment matrices with different granularities, a new method of analysis is proposed. The linguistic terms in ordered linguistic terms sets are 'quantized' to transform the original linguistic judgment matrices into complementary ones through variables' conversion, with a consistency analysis done for the transformation of judgement matrices. Then, the complementary judgment matrices are aggregated into a group preference matrix by the OWA operator and the best alternative is determined by computing the dominance of every alternative. A numerical example is given to illustrate the practicability and usefullness of the method proposed. References | Related Articles | Metrics

Select

Method and applications of multi-step variable weight combination forecasting - With China's postal service revenue and staff as example Han, Ying (1); Huang, Xiao-Yuan (1); Li, Li-Jun (1) 2007, 28 (7):  1061-1064.  DOI: - Abstract ( 193 )   HTML   PDF (161KB) ( 791 )   In view of the fact that the determination of variable weights has not used fully the acquired forecasting data, a method of multi-step variable weight combination forecasting is proposed to forecast China's postal service revenue and postal staff from 2005 to 2010 as an example in application. The method is used to determine the weights in each period by making full use of acquired forecasting data together with the multi-step solution to quadratic programming, then the weights are reused for combination forecasting. The forecasting results show that the method is rational and easy to operate. China's postal service revenue will increase gradually in the years to come. However, the number of postal staff will decrease because of the improvement of labor productivity and reduction of redundant staff, but the reduction tends to slow down. On the other hand, it should not be overlooked that the postal service can provide jobs for employment and is necessary for national economic growth. References | Related Articles | Metrics