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이춘일,김정완,길현교,장연복,박정식,박성우,김병태,최문기,고영박,선덕재 대한내과학회 1990 대한내과학회지 Vol.38 No.3
Heat stroke is a medical emergency and the most important environmental heat illness. It is a disease of high fever, dry warm skin without sweating, and mental disturbances. It commonly involves several organs including the liver, kidney, heart, brain, and the coagulation system. Recently, we experienced 10 cases of heat stroke. The clinical findings of those were as follows: 1) At the time of admission, body temperature in all patients were higher than 39.4℃, and especially in 4 cases, higher than 41.4℃ : pulse rates in all patients were more than 140/min: and systolic blood pressure were less than 100 ㎜Hg except in one case. 2) The clinical manifestations were CNS symptoms including 6 cases of coma, variable skin lesions, G-I hemorrhage, muscle swelling with tenderness and oliguria. 3) On blood chemistry, there were markedly decreased levels of protein, albumin and calcium: markedly inceased level of SGOT, SGPT, CPK, LDH, BUN, and creatinine: one case of hypokalemia and two cases of hyperkalemia: and 4 cases of hyperbilirubinemia greater than 2㎎/㎗. 4) Two cases of myoglobinuria, 3 cases of proteinuria nd 1 cases of hematuria were observed. 5) Complications, such as uremia, ventricular tachycardia, D.I.C., pulmonary edema, pleural effusion, jaundice and acute pancreatitis were observed. 6) Four cases out of 10 were died. The causes of death were pulmonary edema, cerebral edema, D.I.C., hepatic failure and cardiac failure.
이춘만,신성우,정종윤,황영국,박수현 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
At present, industries and researchers are looking for ways to reduce the use of lubricants because of ecological and economical reasons. Therefore, metal cutting is to move toward dry cutting or semi-dry cutting. This paper presents an investigation into MQL(Minimum Quantity Lubrication) machining with the objective of evaluating the cylindricity for the turning process of SM45C. To reach this goal, several cylindrical-outer-diameter turning experiments are carried out by fluid cutting, MQL cutting and dry cutting. Also, the temperature of the tool-shank and cylindricity of workpiece are measured. It is found from the results of experiments that the cylindricity in MQL cutting is better than the others.
이춘의,김문태,마승수 한국회계정보학회 2008 회계정보연구 Vol.26 No.4
This study examines the impacts of earnings components on earnings persistence. Earnings components are divided into net income(NI), recurring income(RI), cash flow from operations(CFO) and total accruals(TA). This study also classifies total accruals(TA) into discretionary accruals(DA) and non-discretionary accruals(NDA). According to the prior research, we set up the hypotheses: 1) RI has stronger earnings persistence than NI, because RI doesn't include transitory items 2) earnings persistence of CFO is more powerful than TA, as TA includes much managers' discretionary items such as estimation and cost allocation 3) earnings persistence of DA is weaker than NDA, as DA means managers' opportunistic earnings management. The main test methods used in this study are correlation analysis, two-sample independent t-test and multiple linear regression analyses. The test sample consists of 1,674 firms-year data, selected from the Korea Stock Exchange(KSE) listed companies during 2002~2005. The major findings of the study show that earnings persistence of RI and CFO even stronger than NI and TA as we expected. These results are consistent with prior evidence. But we can't get the significant difference between DA and NDA. 본 연구는 순이익과 경상이익, 발생항목과 현금흐름, 재량적발생액과 비재량적발생액 등 주요한 이익구성 내용을 세분하여 각각 이익지속성에 미치는 상대적인 설명력을 분석하였다. 본 연구는 15년간 이익의 시계열 자료로 이익지속성을 추정하여 종속변수로 정의하였으며, 단계별 이익과 이익구성 변수를 이에 대응하여 각각의 설명력을 비교하였다. 연구 기간은 2002년부터 2005년까지이며, 12월말 결산 상장 제조법인의 연도-기업 1,674개 표본이 분석되었다. 연구결과는 다음과 같다. 첫째, 순이익과 경상이익 모두 이익지속성을 설명하고 있으나, 경상이익의 지속성 설명력이 더 높았다. 둘째, 발생항목의 이익지속성은 약한 양(+)의 회귀계수로 통계적 유의성을 가지지 못하였으나, 현금흐름은 통계적으로 매우 강한 양(+)의 미래이익지속성 설명력을 보여 발생항목과 대조를 보였다. 셋째, 재량적발생액과 비재량적발생액은 각각 통계적으로 유의하지 않는 음(-), 양(+)의 설명관계를 보였다. 요컨대, 미래 이익을 유입시키는 경상적(비경상적)이고 지속적인(일시적인) 항목의 이익지속성이 높다(낮다)는 것을 알 수 있다. 본 연구는 이익의 세분요소가 이익지속성에 미치는 실증결과를 제시하였다는 점에 의의를 둔다.
이춘만 國立 昌原大學校 産業技術硏究所 1994 産技硏論文集 Vol.8 No.-
A thermo-viscoplastic finite element analysis is made for axisymmetric electro-upsetting process which is used for production of preforms of engine valves, flanged shaft and so on. The analysis of deformation and heat transfer are carried out for the process by decoupling the two analysis. An automatic remeshing technique is proposed by employing specially designed mesh structure. Process parameters, such as, heart transfer coefficient, upsetting temperature, heating current, feedrate of billet bar are discussed to obtain properly deformed shape.