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부유형 해양 광생물반응기의 선택적 투과막의 술폰화 반응을 통한 Biofouling 억제 및 미세조류 생산성 향상
김광민(Kwangmin Kim),이윤우(Yunwoo Lee),김지훈(Z-Hun Kim),박한울(Hanwool Park),정인재(Injae Jung),박재훈(Jaehoon Park),임상민(Sang-Min Lim),이철균(Choul-Gyun Lee) 한국해양바이오학회 2017 한국해양바이오학회지 Vol.9 No.1
The purpose of this study was to inhibit biofouling on a selectively permeable membrane (SPM) and increase biomass productivity in marine photobioreactors (PBRs) for microalgal cultivation by chemical treatment. Surfaces of a SPM, composed of polyethylene terephthalate (PET), was sulfonated to decrease hydrophobicity through attaching negatively charged sulfonic groups. Reaction time of sulfonation was varied from 0 min to 60 min. As the reaction time increased, the water contact angle value of SPM surface was decreased from 75.5o to 44.5o, indicating decrease of surface hydrophobicity. Furthermore, the water permeability of sulfonated SPM was increased from 5.42 mL/㎡/s to 10.58 mL/㎡/s, which reflects higher nutrients transfer rates through the membranes, due to decreased hydrophobicity. When cultivating Tetraselmis sp. using 100-mL floating PBRs with sulfonated SPMs, biomass productivity was improved by 34% compared with the control group (non-reacted SPMs). In addition, scanning electron microscopic observation of SPMs used for cultivation clearly revealed lower degree of cell attachment on the sulfonated SPMs. These results suggest that sulfornation of a PET SPM could improve microalgal biomass productivity by increasing nutrients transfer rates and inhibiting biofouling by algal cells.
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Clopidogrel에 의해 발생된 전신 염증 반응 증후군 1례
김민환,김종훈,박경일,박혜연,황철웅,김의석,도준형,남궁준,이성윤,이원로 白中央醫療院 2005 仁濟醫學 Vol.26 No.1
Clopidogrel bisulfate, a widely used inhibitor of platelet aggregation, is considered at least as safe as aspirin. We describe a 61 year old male patient who developed a systemic inflammatory response syndrome consisting of high fever, rash, chills, impaired liver function, and mild leukopenia after receiving clopidogrel after coronary angiography and stent implantation. The reaction resolved promptly after withdrawal of the drug, thus making the diagnosis of a clopidogrel induced reaction highly probable.
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金敏哲 기전여자대학 1997 論文集 Vol.17 No.-
Bankruptcy has been defined in numerous ways according to the objects of researches. A bankrupt firm in this study is defined as a firm that has filed the legal supervision under the Corporate Reorganization Act. The reason is that in recent years most bankrupt listed firms have attempted to reorganize by using legal supervision at the early stage. The payoff patterns to the creditors are investigated with payoff rates of claims for firms which filed the bankruptcy. With the sample of 24 reorganized firms the average payoff rates for the secured and unsecured creditors are 76.9% and 59.8%, respectively. In the case of 8 liquidated firms, the payoff rate for all creditors is just 5.1%. Therefore, creditors can ensure that what they receive in reorganization would be at least as great as what they receive in liquidation. The payoff pattern for equity holders is investigated by two methods. First, the ratio of equity retaining after filing the bankruptcy is calculated with 25 reorganized firms. Second, the excess returns are calculated with 19 reorganized and 18 liquidated firms to test whether the difference exists. The result shows that the ratio of equity retaining is 87.4% in the case of reorganization. It would be reasonable to assume that the ratio would be close to zero in the case of liquidation although exact figure is unable to present due to the lack of related data. The second test shows that the average excess return of the reorganized firms is higher than that of liquidated firms. In sum, like the creditors, the equity holders would also benefit from the reorganization.
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기관투자자의 주식 소유비율에 따른 회계이익공시의 정보효과에 대한 연구
김민철 기전여자대학 1992 論文集 Vol.12 No.-
This study is the test of the differential information content of earnings disclosure according to the high or low stock possesion of institutional investor. The test consists of two empirical steps. First, we carry out test with entire sample firms. Second, only large size sample firms (assets more than 100 billions won) is used for test. The result presented in first step is that the information content of low possession group is early than that of high possession group and it is not consistent with the hypothesis of this study. Hut the result of second step is the information content of high possession group is early than low possession group and it agrees with the hypothesis of this study. This phenomenon proves that the stock possession of institutional investor does not affect to information content but affects to information content when we use large size firms only.
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김민철 기전여자대학 1998 論文集 Vol.18 No.-
The composition law which was made first in 1962 and was reformed in 1981, 1984, 1998, is to reorganize for financial distressed firms, and yet it was seldom used by those firms as compared with the reorganization law which is an alternation one until 1996, but many bankrupt firms have suddenly begun to file by this law since 1997. It seemed there were reasons on the change. In this paper I report on the investigation of the unexpected change and address about a content of the 1998 reformed law. My evidences indicate that is a passing phenomenon for making an illicit use of law. A judge who participate to reform the law said "the composition law is for a small company which the relation of credit and debt is not complicate. But many large firms have filed lately because managers maintain their position. It was wrong. So, we reformed the law those companies will not file."
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김민철 한국세무회계학회 2004 세무회계연구 Vol.14 No.-
본 연구는 상장기업들이 관리종목으로 지정되는 경우 관리종목지정사유와 주가수익률의 관계를 조사하여 도산관련연구에서 어느 경우를 도산으로 정해야 하는가에 대하여 살펴보고자 한 것이다. 연구결과 관리종목지정사유가 재무적 요인인 경우와 비재무적 요인인 경우의 두 기업군 간에 관리종목지정 10일전부터 유의적인 차이가 발생하기 시작하여 지정 후 30일까지 통계적으로 유의적인 차이가 있는 것으로 나타났다. 특히 비재무적요인에 의하여 관리종목에 지정된 기업의 경우에는 관리종목지정이 시장평균수익률과 큰 차이 없이 움직이는 것으로 나타나 관리종목지정 자체가 도산으로 볼 수 없음을 보여주고 있었다.
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박철민,김영찬 중앙대학교 기술과학연구소 1989 기술과학연구소 논문집 Vol.19 No.-
분산 시스템의 설계에서 중요시 되는 것은 바로 결함 허용이며, 이 시스템들은 중복 또는 여분의 프로세서들(노드들)이나 중복 통신 링크들에 의해서 결함 허용이 이뤄진다. 결함 허용에는 4가지 기본에 의해서 처리과정이 요구된다. 즉, 결함탐지, 결함진단, 시스템 재구성, 시스템 복구이다. 다중 프로세서 네트워크의 주요한 설계 목적 중에 하나인 노드 (프러세서)에 대한 재구성은 집중이나 분산 방식으로 각각 이루어질 수 있는데 본 논문에서는 분산 루프 시스템을 위한 시스템 모델및 분산 방식에 따른 동적 재구성 알고리즘을 제시하고 그 성능을 평가한다. 제시된 알고리즘은 재구성 수행시 후보 로컬 슈퍼바이저의 사용없이도 로컬 슈퍼바이저의 propagation 방향을 동적으로 결정함으로서 propagation 단계를 줄여 재구성 시간을 단축시킬 수 있도록 하였으며 이를 위하여 시스템 구성시 여분 노드를 동적으로 배치하였다.
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비대칭 하프-브릿지 컨버터의 무부하시 전력소모 감소에 관한 연구
송의호,김철민 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
This paper deals with power saving technique for the asymmetrical half-bridge converter on no-load. Because of ZVS the converter has efficiency and represents low EMI characteristics. However, the ZVS operation leads to power loss under no-load condition. It is caused by conduction current through parasitic elements. A scheme of power saving at no=lead is represented and verified through experimental results for 60W sample.
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