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김영겸,이강인,김진용,이진규 한국경영과학회 1994 韓國經營科學會誌 Vol.19 No.1
Imprecision of evaluation or lack of prior information about preference can be an obstacle for decision maker in representing his strict preference. Therefore, fuzziness of preference can take place, and in addition, intransitivity or incomparability of preference becomes the critical difficulty in making complete preorder of alternatives. In order to get better solution and to improve practical usefulness, MCDM should be established as a pseudo-criterion model that include fuzzy preference. In this paper, we suggest a pseudo-criterion model that can make complete preorder of alternatives by metric distance measure.
注文調達其間을 갖는 減員발생 在庫의 定量發注모델에 대한 硏究
金英謙 동국대학교 대학원 1988 大學院硏究論集-東國大學校 大學院 Vol.18 No.-
In the existing decay models which allow random demand, it is assumed that the leadtime for placing an order is zero.However,the assumption is known to be unrealistic in practice. In this study the effects of probabilistic leadtime on optimal lot-size and reorder point is investigated and lost sales case is compared with backorders case. The results of testing this model indicate that first, reorder point is higher in proportion to decay ratio, second, reorder point in lost sales case is higher than backorders case, and third, order quantity is slightly infiuenced by decay ratio.
송다혜,김영겸,이진규,Song, Da Hye,Kim, Yeong Gyeom,Lee, Jin Kyu 한국분말야금학회 2020 한국분말재료학회지 (KPMI) Vol.27 No.1
In this study, we report the microstructure and characterization of Ta<sub>20</sub>Nb<sub>20</sub>V<sub>20</sub>W<sub>20</sub>Ti<sub>20</sub> high-entropy alloy powders and sintered samples. The effects of milling time on the microstructure and mechanical properties were investigated in detail. Microstructure and structural characterization were performed by scanning electron microscopy and X-ray diffraction. The mechanical properties of the sintered samples were analyzed through a compressive test at room temperature with a strain rate of 1 × 10<sup>-4</sup> s<sup>-1</sup>. The microstructure of sintered Ta<sub>20</sub>Nb<sub>20</sub>V<sub>20</sub>W<sub>20</sub>Ti<sub>20</sub> high-entropy alloy is composed of a BCC phase and a TiO phase. A better combination of compressive strength and strain was achieved by using prealloyed Ta<sub>20</sub>Nb<sub>20</sub>V<sub>20</sub>W<sub>20</sub>Ti<sub>20</sub> powder with low oxygen content. The results suggest that the oxide formed during the sintering process affects the mechanical properties of Ta<sub>20</sub>Nb<sub>20</sub>V<sub>20</sub>W<sub>20</sub>Ti<sub>20</sub> high-entropy alloys, which are related to the interfacial stability between the BCC matrix and TiO phase.
費用中心의 機械셀-部品群의 經濟的 形成方法에 관한 硏究
李震圭,金英謙,金鎭勇 동국대학교 대학원 1991 大學院硏究論集-東國大學校 大學院 Vol.21 No.-
The purpose of this study is to develop a cost based heuristic algorithm selecting an optimal combination of machine cell and part family under the condition of minimizing total cost or number of exceptional elements. This heuristic algorithm considers cost elements such as processing cost, subcontract cost, and production frequency. This algorithm can be applied to real situation by using, preference, and production expert's importance or production ratio or flow ratio as a weight factor. When this proposed approach is applied to the real situation, expected benefits are as follows : the reduction of production lead time, work in process, labor force, tooling. rework and scrap, setup time. order time delivery, and paper work, additionally, it is expected that the human relationship and productivity can be improved.
이강인,정지안,김영겸,조성구 한국경영과학회 1993 한국경영과학회지 Vol.18 No.3
It is not rare to observe that a decision-maker frequently changes his choice strategy in the repetitive gamble choice situation. This change in risk preference attitude, however, is not well explained with the existing gamble choice models, such as Bell's disappointment-elation model which is an interesting extension of the classical MEU model. This paper shows that this change in risk preference attitude should be interpreted as a systematic transition of "d" and "e", the disappointment and elation constants of Bell's model respectively. A laboratory experiment is also performed to identify the factors which greatly affect the decision-makers' risk preference attitude change. The number of consecutive successes / failures and the amount of remaining capital found to be statistically significant factors.