The Chung-Shan Institute of Science and Technology is the primary research and development institution of the Republic of China Ministry of National Defense's Armaments Bureau and has been active in the development of various weapons systems and dual use technologies. CSIST is also involved in developing systems for Taiwan's civilian space program. The institute is administered under the Armaments Bureau of the ROC Ministry of National Defense , and is headquartered in Longtan District, Taoyuan City, Taiwan. Wikipedia.
Lee M.-Z.,Chung Shan Institute of Science and Technology
IEEE Transactions on Systems, Man, and Cybernetics Part A:Systems and Humans | Year: 2010
Optimization problems solved using very large scale neighborhood (VLSN) search algorithms include scheduling problems, the capacitated minimum spanning tree problem, the traveling salesman problem, and weapon-target assignment (WTA). This correspondence paper presents an enhanced VLSN search algorithm for obtaining feasible solutions and constructing improvement graphs. This enhanced VLSN search algorithm solves the constrained WTA (CWTA) problem, in which the number of interceptors available to each weapon and the number of interceptors allowed to fire at each target have upper bounds. The proposed enhanced VLSN search algorithm can solve a CWTA problem with 100 targets and 100 weapons (where the upper bound on the number of interceptors for each weapon is one and both the lower and upper bounds on the number of interceptors for each target are equal to one) within an average of 3 s. This study demonstrates that the proposed Enhanced VLSN is superior to existing approaches. © 2009 IEEE.
Chih M.,Chung Shan Institute of Science and Technology
Applied Soft Computing Journal | Year: 2015
The multidimensional knapsack problem (MKP) is a combinatorial optimization problem belonging to the class of NP-hard problems. This study proposes a novel self-adaptive check and repair operator (SACRO) combined with particle swarm optimization (PSO) to solve the MKP. The traditional check and repair operator (CRO) uses a unique pseudo-utility ratio, whereas SACRO dynamically and automatically changes the alternative pseudo-utility ratio as the PSO algorithm runs. Two existing PSO algorithms are used as the foundation to support the novel SACRO methods, the proposed SACRO-based algorithms were tested using 137 benchmark problems from the OR-Library to validate and demonstrate the efficiency of SACRO idea. The results were compared with those of other population-based algorithms. Simulation and evaluation results show that SACRO is more competitive and robust than the traditional CRO. The proposed SACRO-based algorithms rival other state-of-the-art PSO and other algorithms. Therefore, changing different types of pseudo-utility ratios produces solutions with better results in solving MKP. Moreover, SACRO can be combined with other population-based optimization algorithms to solve constrained optimization problems. © 2014 Elsevier B.V. All rights reserved.
Chung C.-H.,Chung Shan Institute of Science and Technology |
Chen M.-S.,National Taiwan University
Automatica | Year: 2012
This paper proposes a new adaptive feedforward cancellation (AFC) control that achieves periodic tracking and/or periodic disturbance rejection. The new control design is a direct scheme in the sense that it adaptively updates the desired control without estimating the unknown disturbance. The proposed new control has several advantages. First, its adaptation gain can be arbitrarily chosen without upsetting the system stability if given the exact system model. Second, it can be applied to not only minimum-phase systems, but also non-minimum phase systems. Third, the new control law is independent of where the disturbance enters the system. Finally, a robustness analysis is made to show that the proposed control is robust with respect to un-modelled dynamics. © 2011 Elsevier Ltd. All rights reserved.
Chung Shan Institute of Science and Technology | Date: 2015-05-20
In a method and apparatus for evaporation depositing uniform thin films, a film is deposited on a substrate of a vacuum environment while maintaining a constant deposition rate. A cover is installed on a wall of the evaporation vessel. When the evaporation material is heated to an evaporation state and the interior of the evaporation vessel reaches a first vapor saturation pressure, the vapor of the evaporation material flows towards a pressure stabilizing chamber. When the pressure stabilizing chamber reaches a second vapor saturation pressure which is smaller than the first vapor saturation pressure, the vacuum environment has a vacuum background pressure which is smaller than the second vapor saturation pressure, so that the evaporation material vapor flows from the pressure stabilizing chamber towards the vacuum environment at constant rate due to the pressure difference, so as to evaporate the substrate.
Chung Shan Institute of Science and Technology | Date: 2014-11-17
A hydraulic energy conversion device includes a main body being an annular member having a central hole, an output shaft mounted in the central hole of the main body with a centerline extended perpendicular to the central hole; a fixing plate located at an end of the main body and provided with a plurality of passage holes; an outer cover located at another end of the main body opposite to the fixing plate and having a central opening for the output shaft to outwardly extended through the outer cover; and a plurality of vanes circumferentially spaced on the output shaft to locate in a space defined between the main body, the fixing plate and the outer cover. The hydraulic energy conversion device is mounted in a hydraulic shock absorber to convert hydraulic energy into mechanical energy and output the same without hindering the hydraulic shock absorber from normal operation.