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PBL 계약을 위한 수리부속 재고비용 예측과 V-METRIC의 활용에 관한 연구
김윤화,이성용,Kim, Yoon Hwa,Lee, Sung Yong 한국시스템엔지니어링학회 2017 시스템엔지니어링학술지 Vol.13 No.1
For the PBL contract, it is necessary for the contracting parties to share information regarding the reasonable inventory-level and the cost of its repair parts for the estimated demand. There are various models which can be used for this purpose. Among them, V-METRIC model is considered to be the most efficient and is most frequently applied. However, this model is usually used for optimizing the inventory level of the repair parts of the system under operation. The model uses a time series forecast model to determine the demand rate, which is a mandatory input factor for the model, based on past field data. However, since the system at the deployment stage has no operational performance record, it is necessary to find another alternative to be used as the demand rate of the model application. This research applies the V-METRIC model to find the optimal inventory level and cost estimation for repairable items to meet the target operational availability, which is a key performance indicator, at the time of the PBL contract for the deployment system. This study uses the calculated value based on the allocated MTBF to the system as the demand rate, which is used as input data for the model. Also, we would like to examine changes in inventory level and cost according to the changes in target operational availability and MTBF allocation.
김윤화,이성용,Kim, Yoon Hwa,Lee, Sung Yong 한국시스템엔지니어링학회 2016 시스템엔지니어링학술지 Vol.12 No.2
As the inventory costs of repairable items in military logistics continue to increase, many studies for optimal inventory level of these items are being carried out in advanced countries, including the US, to reduce these costs. Research on inventory level optimization for repairable items aimed to achieve the availability goal of a system with a MIME(Multi Indenture Multi Echelon) repair policy structure first began with Sherbrooke's METRIC and developed into various types. This research is to analyze and compare recent V-METRIC related studies to search for another variation in this field. This paper mainly looks at how to determine optimum inventory level for each repairable item to achieve a specific availability target within a limited budget, and also how to minimize inventory cost while achieving its availability target by determining optimal inventory level of each repairable item.
망막전위도검사에서 ERG-Jet 단극전극과 Burian-Allen 양극전극의 파형 비교
박지현,이호경,박성준,김윤화,Jihyun Park,MD,Hokyung Lee,MD,Sung Joon Park,MD,Yoon Hwa Kim 대한안과학회 2010 대한안과학회지 Vol.51 No.9
Purpose: To compare electroretinogram (ERG) waveforms acquired using an ERG-jet electrode and a Burian-Allen electrode. Methods: ERGs were recorded with an ERG-jet electrode and a Burian-Allen electrode from both eyes of 29 volunteers. Three consecutive recordings were obtained with both electrodes from the left eye of another 6 volunteers. Peak-to-trough amplitudes and peak implicit times were compared between both eyes, and between the 2 types of electrodes. Interpersonal and intrapersonal variation were also compared. Results: The differences in amplitude and implicit time between the right and left eyes were not influenced by the type of electrode. The amplitude of the ERG acquired using the Burian-Allen electrode, however, showed significant differences between both eyes, contrary to the amplitude acquired using the ERG-jet electrode. ERG recordings obtained using the ERG-jet electrode generally showed higher amplitude, shorter implicit time, and less interpersonal and intrapersonal variation than ERG recordings obtained using the Burian-Allen electrode. Conclusions: In this application, the ERG-jet ERG electrode appeared to be superior to the Burian-Allen electrode in terms of both usefulness and consistency. J Korean Ophthalmol Soc 2010;51(9):1217-1223
대뇌 핍지교종이 동반된 Turcot 증후군 1예의 유전학적 분석
김한수 ( Han Soo Kim ),박지영 ( Ji Young Park ),김효종 ( Hyo Jong Kim ),지성길 ( Sung Gil Chi ),김윤화 ( Yoon Hwa Kim ),이길연 ( Kil Yeon Lee ),정용희 ( Yong Hee Joung ),한요셉 ( Yo Seb Han ),동석호 ( Seok Ho Dong ),김병호 ( Byung 대한장연구학회 2003 Intestinal Research Vol.1 No.2
Turcot`s syndrome (TS) is a genetic disease characterized by primary brain tumor, colon cancer and/or multiple colorectal polyps. The mode of genetic transmission of the syndrome still remains unclear because TS is a rare disorder. The majority of central nervous system (CNS) neoplasms associated with TS are glioma, glioblstoma multiformes and medulloblastoma. Other types of CNS tumors related to TS have been noted in a few case reports, and there are only two reports of oligodendroglioma associated with TS. To the authors` knowledge, this is the first case of a patient with TS who had a cerebral oligodendroglioma and a colorectal adenocarcinoma in Korea. Therefore, the authors performed genetic analysis of this patient and her family to determine the genetic variants, including mutations in APC gene and mismatch repair gene, in Turcot`s syndrome. (Intestinal Research 2003;2:192-196)
이성용 ( Sung Yong Lee ),김윤화 ( Yoon Hwa Kim ) 대한설비관리학회 2016 대한설비관리학회지 Vol.21 No.1
The purpose of this paper is to see if the current supply transport system of auto parts is efficient by comparing the current system to the alternative suggested transport system. The transport cost for the current system which is using partly direct transport and partly cross-dock is examined first. Then this cost is compared to the cost for the alternative system which uses a heuristic method. As a result, the alternative method appears to be better than the current method. However, since the suggested system also has some drawbacks, it might be necessary to apply the new better improved system which needs more study, rather than just substitute the suggest one to the current system.
Henoch-Schonlein 자반증 임상양상으로 나타나 진단이 늦어졌던 웨게너 육아종증
송세빈 ( Se Bin Song ),최혜숙 ( Hye Sook Choi ),김이형 ( Yee Hyung Kim ),최천웅 ( Cheon Woong Choi ),박명재 ( Myung Jae Park ),유지홍 ( Jee Hong Yoo ),강홍모 ( Hong Mo Kang ),김윤화 ( Yoon Hwa Kim ),박주철 ( Joo Cheol Park ) 대한결핵 및 호흡기학회 2007 Tuberculosis and Respiratory Diseases Vol.63 No.6
Wegener`s granulomatosis is a systemic vasculitis of the medium and small arteries, as well as of the venules, arterioles, and occasionally large arteries, and primarily involves the upper and lower respiratory tracts and the kidneys. Renal symptoms of Wegener`s granulomatosis are indistinguishable from those of vasculitis such as Henoch-Schonlein purpura and microscopic polyangiitis. This case, though initially diagnosed as Henoch-Schonlein purpura, was confirmed as Wegener`s granulomatosis from a lung biopsy fifteen years after the initial diagnosis. We report this case with a review of the literature. (Tuberc Respir Dis 2007;63:531-536)
槪週期, 循環 및 Point-wise Non-Wandering 寫像에 關한 몇 定理에 對하여
金潤和 全北大學校 1963 論文集 Vol.5 No.-
In this note we are concerned with only two of the theorems given by W.H. Gottschalk. Theorem 1(a) is theorem 1 of (1) without the restriction that f be a homeomorphism. Theorem 1 (b) is theorem 6 of (1) without the restrictions that f be a homeomorphism and that the Topological Space X be compact. Theorem 2 is essentially theorem 2 of (1) without compactness restrictions. The proof as given assumes {x} is closed, but could easily be modified so as to dispense with this assumption.
網膜色素上皮細胞의 Lysosomal acid phosphatase의 活性値 測定
김복희,김은경,김윤화,백미화,이지숙,조영숙,황응숙 曉星女子大學校 藥學大學 學生會 1988 曉星藥誌 Vol.4 No.-
Measurement of lysosomal enzyme activity in the rabbit eye was effected using acid phosphatase as enzyme markers. Acid phosphatase in the retinal pigment epithelium of the rabbit eye was studied using standard enzymological techniques. The enzyme activity in the lysosomal extract of the pigment epithelium was 54.9±23.0 King-Armstrong Unit/dl.