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Loss-Separation Study on Silica-insulated Gas-atomized Fe-Si-Al Soft Magnetic Composites
T. T. Xu,B. W. Zhang,Z. Shi,W. W. Guan,K. Wan,X. Y. Shi,W. Liu,H. L. Su,Z. Q. Zou,Y. W. Du 한국자기학회 2020 Journal of Magnetics Vol.25 No.2
Fe-Si-Al soft magnetic composites were composed of gas-atomized Fe-9.6wt.%Si-5.4wt.%Al alloy powders insulated with silica nanoparticles. The influence of silica insulation content on the core’s magnetic properties was studied. It was found that increasing the silica mass ratio deteriorated the effective permeability and core loss in the frequency range of 40-120 kHz, while improved the quality factor at 100 kHz and DC-bias performance. The effective demagnetizing field reflected by density and the core’s volume resistivity may cause the variations of these magnetic parameters. Loss separation fitting was performed using the Bertotti formula, indicating that silica insulation increased the hysteresis loss and reduced the eddy-current loss. The hysteresis loss took over at the frequency lower than 120 kHz in this work. With increasing the frequency, the eddy-current loss grew more quickly than the hysteresis loss. Therefore, different methods should be adopted to reduce the core loss according to the core’s application frequency.
Dynamic Capacitated Facility Location Problem on the Multi-Commodity Supply Chain
Shi W Lee(이시우) 대한산업공학회 2012 대한산업공학회지 Vol.38 No.2
This paper concerns a dynamic capacitated facility location problem distributing multi-commodities over the multi-echelon supply chain network, where many different products are distributed over different layers of supply chain during a time horizon to satisfy customers demand. The capacities and locations of facilities are responsively and dynamically changed for supply chain to operate more efficiently and respond quickly to demand changes. Since facility relocations and capacity transfers take considerable resources in a significant lapse, a strategic planning effort for these projects is required to avoid failing to satisfy customers orders. When the facility relocations or capacity transfers are carefully planned to satisfy the demands at less costs, the unavailability during the relocation of facilities or change of the capacities in multi-echelon supply chain with multicommodities can be justified. Computational results show that the proposed mixed integer programming model is effective.
시정곤 ( C. -k. Shi ),고창수 ( W. -k. Kim ),김원경 ( C. -s. Ko ) 한국언어정보학회 2000 언어와 정보 Vol.4 No.2
The purpose of this paper is to establish the standard method of evaluating English-to-Korean MT systems. We focus on test suites, evaluation procedure, and evaluation results. Four computer programs on the market are tested on a test suite consisting of 1, 501 sentences. The quality of translation and the capacity of MT system are the key points for evaluation. The sentences in the suite are classified according to the grammatical properties they reveal. The classificatory scheme has the structure of a directory: each sentence belongs to a subclass, which belongs to a major class. We place the sentences in the test suite on a scale of difficulty (hard, ordinary, easy), and each output sentence is graded on a scale of four accuracy levels. We also test the programs with respect to their speed.
사문사(W. S. Shi),고종민,구태완(T. W. Ku),강범수(B. S. Kang) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
To produce thick, large and long pipe used for oil, gas and water pipelines, thick plate bending process using press-braking bending apparatus is more suitable. In the press-braking bending, main process parameters are able to be summarized as stroke of the press-braking knife, distance between both rollers, and feeding length of the thick plate. In fact, various pipe diameters could be obtained by combinations of the mentioned parameters. In this study, the press-braking bending is considered to simulate and verify the thick plate bending process for shaping the flat plate into the required circular and tubular pipe. The repetitive numerical simulations by feeding the plate are performed by finite element analysis in case of the knife stroke of 18mm, the turning roller distance of 250mm, and the feeding length of 50mm. The simulated result is compared with those of the experiment. As the results, the evaluation to verify the soundness for the obtained pipe is carried out, and the pipe diameters between the numerical and the experimental approaches are well matched.
A Genetic Algorithm for the Container Pick-Up Problem
Shi W. Lee 대한산업공학회 2011 산업공학 Vol.24 No.4
Container pick-up scheduling problem is to minimize the total container handling time, which consists of the traveling distance and the setup time of yard cranes in a container yard. Yard cranes have to pick-up the containers which are stacked in the yard-bays to satisfy the work schedule requirement of quay crane, which loads and unloads containers on or from container ships. This paper allows the movement of multiple yard cranes among storage blocks. A mixed integer programming model has been formulated and a genetic algorithm (GA) has been proposed to solve problems of large sizes. Computational results show that the proposed GA is an effective method.