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배상수(S.S Bae),강동진(D.J. Kang),김수연(S.Y. Kim),임명택(M.T. Lim) 한국전산유체공학회 1995 한국전산유체공학회 학술대회논문집 Vol.1995 No.-
A numerical procedure for the analysis of transient behavior in a monolithic catalytic converter is presented. The thermal behavior of a monolithic catalytic converter is fully coupled with mass transfer and exothermic reaction between exhaust gases and the catalytic converter. In the present study, all these processes are solved simultaneously. The heat transfer process is approximated by combinging one dimensional convection and conduction and the chemical reaction is also simply modelled by using the concepts of reaction rate and reaction heat. All the partial diffenrential equations for the heat transfer, mass transfer and chemical reactions are appximated by using finite volume method. Resulting algebraic equations are solved using the Newton's method. To see the workability of present numerical method, two well known problems, say step increase and step decrease in the gas inlet temperature, have been calculated. Comparion of present solutions with previous solutions shows a good agreement.
나덕렬,연병길,강연욱,민경복,이수현,이상숙,이미라,표옥정,박찬병,김선민,배상수,김동현,Na, Duk-L.,Yeon, Byeon-Gil,Kang, Yeon-Wook,Min, Kyung-Bok,Lee, Soo-Hyun,Lee, Sang-Suk,Lee, Mi-Ra,Pyo, Ok-Jung,Park, Chan-Byung,Kim, Sun-Mean,Bae, Sang-S 대한예방의학회 1999 예방의학회지 Vol.32 No.3
Objectives: In Korea, as in most countries, there will be a sharp increase in the number of dementia patients in the near future. However basic data on dementia prevalence, which is important in defining epidemiologic characteristics and in implementing preventive strategy, are limited. This study was conducted to estimate the prevalence rate of dementia in the urban elderly aged 65 or older in Kwangmyung, Korea. Methods: A two phase design was used for case finding and case identification. In phase I, a representative sample aged 65 or older was selected and interviewed by door-to-door survey with a Korean version of the Mini-Mental State Examination (K-MMSE). In phase II, Of the 946 subjects interviewed in phase 1,356 elderly were randomly selected disproportionately according to K-MMSE score. Of these elderly, 223 (61.5%) underwent standardized clinical evaluations, including psychiatric interview, neurological examination, and neuropsychological assessment. Dementia was diagnosed by the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) criteria. The diagnosis of Alzheimer's disease (AD) was made by National Institute of Neurological and Communicative Disorders and Stroke-Alzheimer's Disease and feinted Disorders Association(NINCDS-ADRDA) criteria and vascular dementia (VD) by DSM-IV. Results: The overall weighted prevalence rate of all dementia among Kwangmyung residents aged 65 or older was 12,8%(age-adjusted rate: 13,0%, 95% Confidence Interval[CI]: 10.6-15.3%). Women had much higher prevalence rate than men even when age was controlled(15.9%[95% CI 12.6-19.2%] vs 7.5%[95% CI 4.0-10.4%]), The rates of dementia were 5.2%, 12.2%, 17.0%, and 34.3% for the age groups of 65-69, 70-74, 75-79 and 80 and over, respectively. The rate of AD appeared to be slightly higher than that of VD(5.2% vs 4.8%), though not statistically significant. Most of the cases(69%) were mild dementia according to CDR(<1) in these subjects. Conclusions : These results showed that the prevalence rate of dementia among urban elderly in Korea appears to be higher than those of other Asian countries.
크랭크축 각속도의 변동을 이용한 실린더내 압력 변화 추정(2)
임병진(B.J.Lim),박종범(J.B.Park),임인건(I.K.Lim),배상수(S.S.Bae),김응서(E.S.Kim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper propose a new method to investigate combustion phenomena using the variation of crankshaft speed. From the idea which the variation of crankshaft speed contains the information of combustion the energy method is applied as a single degree of freedom. Through the comparison of measured and calculated<br/> crankshaft speed the proposed energy model is proved to be moderate. When the crankshaft speed is used in the energy equation filtering of speed is required. The frequency components of cylinder pressure is analyzed and<br/> the coefficients of Fourier series above the twelfth frequency of engine speed is considered as a noise. As an example for application of this research some combustion analysis like as mean effective pressure and heat<br/> release rate, and misfire detection were carried out.<br/>