Memetic Algorithm is a population-based approach for heuristic search in optimization problems. It has shown that this mechanic performs better than traditional Genetic Algorithms for some problem. In order to apply i...
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ISBN:
(纸本)9789898111999
Memetic Algorithm is a population-based approach for heuristic search in optimization problems. It has shown that this mechanic performs better than traditional Genetic Algorithms for some problem. In order to apply in the multi-objective problem, the basic local search heuristics are combined with crossover operator in the sub-population in this research. This approach proposed is named as Sub-population with Memetic Algorithm, which is applied to deal with multi-objective Flowshop Scheduling Problems. Besides, the Artificial Chromosome with probability matrix will be introduced when the algorithm evolves to certain iteration for injecting to individual to search better combination of chromosomes, this mechanism will make faster convergent time for evolving. Compares with other three algorithms which are MGISPGA, NSGA-II and SPEA2, the experiments result show that this algorithm possess fast convergence and average scatter of Pareto solutions simultaneously for solving multi-objective Flowshop Scheduling Problems in test instances.
This paper presents a new mathematical definition of straight-line optical flow. By using 21 straight-line optical flows in 3 consecutive image frames, a set of equations about 3D motion parameters are established to ...
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ISBN:
(纸本)9780769535197
This paper presents a new mathematical definition of straight-line optical flow. By using 21 straight-line optical flows in 3 consecutive image frames, a set of equations about 3D motion parameters are established to obtain 12 motion parameters of 3D object and coordinates of the 3D straight line. Usually, it is difficult to find the 21 straight lines on correspondence. In this paper, a minimum of 6 straight-line optical flows in 3 consecutive image frames is required to obtain 12 motion parameters of 3D object and coordinates of the 3D straight line, by solving non-linear equations. With the parameters and coordinates a 3D scene can be reconstructed.
Publish/Subscribe systems are nowadays largely accepted for coordinating applications over wide-area networks, whereas they still suffer when applied to mobile environments. In fact, the typical tree overlay network i...
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ISBN:
(纸本)9789898111999
Publish/Subscribe systems are nowadays largely accepted for coordinating applications over wide-area networks, whereas they still suffer when applied to mobile environments. In fact, the typical tree overlay network implementation of the event service, which provides scalability in the context of wide-area networks, fails when a run-time reconfiguration is needed. This might happen when dealing with the dynamic and mobility characteristics inherent to the pervasive environments. In this proposal, we address such an issue by envisioning a context-aware approach in order to build and maintain the dispatching tree overlay with respect to the context sensed through the environment. The resulting distributed control system optimizes on the energy consumption aspect, which is the key cost measure for a mobile environment such as sensor networks.
Based on the theoretical model, a numerical method is usually necessary for obtaining the optimal preventive maintenance (PM) policy for a deteriorating system since the theoretical model becomes complicated when the ...
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ISBN:
(纸本)9789896740009
Based on the theoretical model, a numerical method is usually necessary for obtaining the optimal preventive maintenance (PM) policy for a deteriorating system since the theoretical model becomes complicated when the system's hazard rate function is changed after each PM. It makes the application of the theoretical model not suitable for real cases. Moreover, the theoretical model assumes using infinite time span to obtain the long-term expected number of failures. Yet, in reality, the deteriorating systems always have a finite life time. Hence, an optimal solution might not be resulted as compared to the infinite time span. Therefore, we consider using the simulation method to obtain a range of the near-optimal PM policy. The critical step of the simulation method for obtaining a near-optimal PM policy is the generation of the random variates (RV). In this research, three methods are developed to generate the required RVs of the time-between-failures (TBF) for the finite-time-span preventive maintenance model with age reduction effect. It is found that there are no significant differences among three proposed RV generating methods when comparing the dispersion of the generated RV's. However, the rejection method is the simplest method for obtaining the near-optimal PM policies. Examples of the near-optimal PM policies are also presented in this paper.
3D face data have the potential to improve the face recognition performance at disadvantageous conditions, such as uncontrolled illuminations, pose and expression. 3D nose tip location is the crucial step for registra...
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ISBN:
(纸本)9780769535197
3D face data have the potential to improve the face recognition performance at disadvantageous conditions, such as uncontrolled illuminations, pose and expression. 3D nose tip location is the crucial step for registration and recognition of 3D face data. An automatic nose tip location and pose estimation method robust for pose changing at 3D face scans is proposed in this paper. We firstly gain some tip candidates by directional maximum and normalize the 3D scan data to front by hypothetical nose tips. Two filters respectively based on local structure of curves and PICA reconstruction curves errors are utilized to discard false tip candidates. The results of nose tip position and face recognition at BJUT 3D Database show the proposed method is efficient and robust for pose angle variety.
In a job shop, each product may have a different processing route through the system. Automated Flexible Manufacturing Cells (FMC) that adopt this flow pattern are highly prone to deadlocks. A supervisor is a controll...
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ISBN:
(纸本)9789898111999
In a job shop, each product may have a different processing route through the system. Automated Flexible Manufacturing Cells (FMC) that adopt this flow pattern are highly prone to deadlocks. A supervisor is a controller that uses available data via feedback loops to characterize the current behavior of the cell, and modify the equipment controllers to achieve the desired operational specifications in a deadlock-free manner. This paper proposes a hierarchical control system divided into an upper level scheduler and a lower level supervisor to control FMCs. The scheduler is responsible for determining a deadlock-free allocation of the resources that optimizes some performance measure, based on the current production requirements, and the supervisor guarantees that the flow plan (behavior) determined by the scheduler is realized on the shop floor. For that purpose, a formal method that can transform a production schedule into a supervisor, in real time, is also proposed. The supervisor is an augmented Marked Graph (MG) that captures all the events that can take place in the cell. The proposed approach is validated by generating and simulating the supervisors for two benchmark problems.
This paper presents the use of a monolithic, force-feedback MEMS (microelectomechanical systems) microgripper for characterizing both elastic and viscoelastic properties of highly deformable hydrogel microcapsules (15...
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ISBN:
(纸本)9781424427888
This paper presents the use of a monolithic, force-feedback MEMS (microelectomechanical systems) microgripper for characterizing both elastic and viscoelastic properties of highly deformable hydrogel microcapsules (15-25 mu m) at wet state during micromanipulation. The single-chip microgripper integrates an electrothermal microactuator and two capacitive force sensors, one for contact detection (force resolution: 38.5nN) and the other for gripping force measurements (force resolution: 19.9nN). Through nanoNewton force measurements, closed-loop force control, and visual tracking, the system quantified Young's modulus values and viscoelastic parameters of alginate microcapsules, demonstrating an easy-to-operate, accurate compression testing technique for characterizing soft, micrometer-sized biomaterials.
The proceedings contain 23 papers. The topics discussed include: planning of maintenance operations for a motorway operator based upon multicriteria evaluations over a finite scale and sensitivity analyses;a multiple ...
ISBN:
(纸本)9783540856399
The proceedings contain 23 papers. The topics discussed include: planning of maintenance operations for a motorway operator based upon multicriteria evaluations over a finite scale and sensitivity analyses;a multiple sensor fault detection method based on fuzzy parametric approach;the shape of a local minimum and the probability of its detection in random search;rapidly-exploring sorted random tree: a self adaptive random motion planning algorithm;applying an intensification strategy on vehicle routing problem;detection of correct moment to model update;robust optimizers for nonlinear programming in approximate dynamic programming;improved positional accuracy of robots with high nonlinear friction using a modified impulse controller;an estimation process for tire-road forces and sideslip angle for automotive safety systems;and path planning for cooperating unmanned vehicles over 3-D terrain.
Economical changes in Europe, as well as increasing global competition are the reasons for continuously growing interest in automation and robotics. It causes significant extensions of the needs and offers in vocation...
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An emerging strategy for application software is to provide web access to software previously distributed as local applications. It requires the development of an entirely different browser-based interface and adaptin...
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ISBN:
(纸本)1934272728
An emerging strategy for application software is to provide web access to software previously distributed as local applications. It requires the development of an entirely different browser-based interface and adapting an existing application to use different presentation technology. This paper describes options for making MATLAB/Simulink applications available via the Web and the new developed web application called SimWebLink. The whole conception is based on the idea that it is possible to observe running simulation or real measurement results in the web browser. SimWebLink is suitable for a remote control and monitoring of the technological process uses MATLAB/Simulink via Internet.
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