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에어콘용 Fin & Tube형 열교환기의 Fin형상이 열교환기의 전열 및 압력강하 성능에 미치는 영향에 관한 수치해석 연구
김철호 서울産業大學校 産業大學院 1997 大學院論文集 Vol.5 No.-
Until now, a great portion of the design work of the heat exchangers in industry has been mainly depended on the experimental approaches. However, with the development of basic theories of basic theories of thermodynamics and fluid mechanics along with the innovation of the computer headwares, people come to understand the importance of the theoretical approaches in the engineering design field. In this study, the pressure drop and heat transfer characteristics of three different types of the compact heat exchangers named Waffle Louvered Fin(Model-1), V-type Waffle Louvered Fin(Model-2), Waffle Slitted fin(Model-3) was analysed numerically to find out their performances at the given operating conditions. The numerical algorithm of the performance analysis of compact heat exchangers developed at this study will be very useful for the design work of new type heat exchangers in future. In the numerical simulation, the flow was assumed as steady incompressible and laminar flow because the Reynolds number of the practical operating range of the heat exchangers is belwo 5000. The natural convection phenomenon on the fin and tube surface was ignored in here as the heat exchangers are cooled by a fan. The three dimensional Navier-Stokes and Energy Equation were sloved. For this calculation, a finite volume code named PHOENICS(v2.2.1)[8] was incorporated and the SIMPLEC algorithm[9] was used for the compensation of the velocity and pressure in the calculation field.
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돼지감자(Helianthus tuberosus L .) 로부터의 알콜 생산을 위한 균주 선발
김철호,유연우,김수일 한국농화학회 1983 Applied Biological Chemistry (Appl Biol Chem) Vol.26 No.2
To investigate the possibility of ethanol production from Jerusalem artichoke tubers (Helianthus tuberosus L.), various yeast strains were evaluated for their potential in metabolizing carbohydrate from Jerusalem artichoke tubers to ethanol. Among them, Kluyveromyces fragilis CBS 1555 showed the highest inulase activity and ethanol fermentability. On the batch kinetic: analysis, K. fragilis also showed the highest in parameters for ethanol production and substrate utilization, although lower than Saccharomyces cerevisiae Y-10 in cell mass yield and ethanol production yield.
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김철호 호남대학교 산업기술연구소 1997 산업기술연구논문집 Vol.5 No.-
Bloch방정식이 propzgator를 적분핵(,kernel)으로 하는 적분방정식과 동등함을 보인다. 이를위해 Green함수의 특성을 갖는 G함수등이 도입되며, Laplace변환이 사용된다. We show formal solution of Bloch equation can be represented by form of integral equation involves propagator as kernel. G function related to Green function and Laplace transform are introduced for the calculations.
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金喆鎬 韓國農業政策學會 1982 농업경영정책연구 Vol.9 No.1
The demand for livestock and poultry products including beef, pork and chicken, whose income elasticities are relatively higher than other staple foods, has been increased significantly during the past two decades in response to the remarkable increase in per ctapita GNP. This trend will be coninued during the fifth and the sixth five year economic development plan period beginning with 1982. The annual GNP growth rate will be 7.5% on the average during the next 10 years. However, there will be continuous or periodical unbalance between demand for and supply of livestock products, primarily because of shortage or surplus in domestic supply. It seems impossible to produce enough beef, at least in the short run, to meet ever increasing demand and far it. Easy to enter or withdraw the production of pork and chicken will sometimes leads to periodical or seasonal fluctation in supply of the respective products. It is greatly needed to estimate the demand for and supply of beef, pork and chicken and to study the feasibilities of domestic production of livestock products for the formulation of adequate policies in order to equate the consumption and the production during the 1980s. So this study reviewed the possible changes in the food consumption patterns during the 1980s, estimated the demand for supply of beef, pork and chicken by using empirical demand supply functions and finally made suggestions for the formulation of long term price stabilization policies for each livestock and poultry products through the equilibrium of the quantity demand for and supply of the products. There are many factors affecting the demand for meats, but this study considered own price, prices of suplements and substitutes and per capita income as the independent variables in the demand equations. It was found that its own price and income were most significantly affecting factors among others and the degree of substitution effects were remarkably different among the products. Cross elasticities of pork and fish prices to beef consumption were 0.5907and 0.3604, respectively, and were statistically signigicant, However, cross elasticity of prok price to beef demand was insignificantly low. According to the meat demand derived in this study, per capita consumption of beef, pork and chicken in the base year 1980 was 11.3 kg for total meat, 2.6 kg beef, 6.3 kg pork and 2.4 kg chicken, respectively. Those in 1986 were 16.3 kg for total meat, 3.2 kg beef, pork 8.4 kg and 4.7 kg chicken, while those in 1991 were 23. 0 kg for total meat, 4.2 kg beef, 10.9 kg pork and 7.9 kg chicken. It means that the total meat consumption will be increased by 103% in 1991 to 1980, beef by 61.5%, pork by 73% and chicken by 229%, respectively. It is also predicted through this study that, when the level of production costs be maintained, the domestic production of pork and chicken will meet the demand for them during the fifth and sixth five year economic plan period. However, there will be chronic shortage of beef supply during the coming 10 years. The annual import requirement will be 15,000 tons to 30,000 tons during the period. In order to stabilize the domestic livestock and poultry products market, the government should introduce measures to curb the increase in beef consumption by encouraging the consumption of pork and chicken. Mainly because, and establishment of beef is impossible in a short period, For this, the livestock production policy measurers should be concentrated on; 1) the improvement of infrastructures of beef production by introducing advanced feeding and management technology, subsidies for the establishment of facilities and price support programs for farmers; 2) the development of dairy beef; 3) the reinforcement of the forecast systems for pork and chicken production and consumption. The improve the marketing systems of livestock and poultry products and to stabilize their prices in the domestic market, the government should introduce following measures; 1) purchase and reserve system development, 2) deficiency payment to support producer's income, 3) introduction of quota systems and levy the difference between domestic and import price for the stabilization of domestic market, 4) carry out the campaign for the changes in meat consumption structures to ease the shortage problems of domestic beef production.
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김철호,Kim Sung-Eun,전진수 대한신경중재치료의학회 2019 Neurointervention Vol.14 No.1
Purpose: To assess clinical and angiographic outcomes after endovascular treatment (EVT) in ischemic stroke patients according to anesthesia types (general anesthesia vs. conscious sedation). Materials and Methods: A systematic literature review through an online data base between January 1990 and September 2017 was performed. A fixed effect model was used in cases of <50% heterogeneity. The primary outcomes were good clinical outcome at the 3-month follow-up and successful recanalization. A meta-regression analysis was done to estimate primary outcomes of log odds ratio (OR) on onset-to-puncture time (OTP) differences. Publication bias was determined using Begg’s funnel plot and additional the Trim and Fill method. Results: Sixteen articles including 2,662 patients (general anesthesia, n=1,275; conscious sedation, n=1,387) were included. General anesthesia significantly decreased good outcomes than conscious sedation (OR, 0.564; 95% confidence interval [CI], 0.354–0.899). However, outcomes did not differ significantly in randomized controlled trials (RCTs; OR, 1.101; 95% CI, 0.395–3.071). Anesthesia type was not associated with successful recanalization (OR, 0.985; 95% CI, 0.787–1.233). General anesthesia increased the risk of mortality (OR, 1.532; 95% CI, 1.187–1.976) and pneumonia (OR, 1.613; 95% CI, 1.172–2.221), but not symptomatic intracranial hemorrhage (OR, 1.125; 95% CI, 0.767–1.652). The meta-regression analysis showed no linear relationship between OTP differences and log OR of good outcome (coefficient, 0.0004; P=0.95) or successful recanalization (coefficient, 0.0005; P=0.94), respectively. Conclusion: General anesthesia seemed to be associated with adverse clinical outcome after EVT. However, its efficacy was not demonstrated in RCTs. Successful recanalization did not differ according to anesthesia type. Studies using individual patient data based on further RCTs are necessary to elucidate anesthesia effect on procedural and clinical outcomes.
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윤리의식의 학제적 적용을 통한 광고 표현에서의 ‘그림자에 의한 실체의 잠식 현상’ 제거 필요성 환기
김철호 한국디지털정책학회 2018 디지털융복합연구 Vol.16 No.2
The purpose of this research is to arouse attention to the importance of eliminating the ‘Shadow Encroaching Phenomena on the Essence’ in advertising expression by interdisciplinarily applying ethicality. This research shows that when advertising expression is planned and executed without enough consideration of ethicality, short-term effectiveness to reach goals can be increased, but it is easy to induce an unintended ‘Shadows’ Boomerang Phenomena’. This research also proposes that such processes arouse consumers’ ethical defense mechanisms, possibly causing the ‘Shadow Encroaching Phenomena’ in the end. In conclusion, this research proposes the following. First, the pursuit of commercial profit in a capitalistic society must be done under the premise of securing a consensus of ethicality in a common society. Second, under the premise of an integrated process of education, sharing, execution, and confirmation of ethicality, companies can achieve both the micro-practical goal of profit pursuit and the macro-environmental goal of ecological sympathy. 본 연구의 목적은 윤리 의식의 학제적·융합적 적용을 통해, 광고 표현에서의 ‘그림자에 의한 실체의 잠식 현상’ 제거 필요성을 환기시키는데 있다. 정성적 접근을 통해, 광고 표현이 윤리 의식에 대한 충분한 고려 없이 가시적 성과 중심으로 기획, 집행될 경우, 목표 달성의 단기적 효율성은 높일 수 있지만, 의도치 않은 ‘그림자의 부메랑 현상’을 이끌어 내기 쉽고, 이는 소비자의 윤리적 방어기제를 환기시켜, 결국 ‘그림자에 의한 실체의 잠식 현상’을 유발할 수 있음을 제시하고 있다. 결론적으로 본 연구는, 첫째, 자본주의 사회에서의 상업적 이윤 추구가 공동체 사회에서의 윤리 의식 공감대 확보를 전제로 진행되어야 하며, 둘째, 윤리 의식의 교육, 공유, 실천, 및 확인 과정이 통합적으로 전제될 때, 기업은 이윤 추구라는 미시 실용적 목적과 사회와의 생태적 교감이라는 거시 환경적 목적을 병행 달성할 수 있게 되고, 이는 장기적인 측면에서 기업의 지속가능 경영의 토대가 될 것임을 제시하고 있다.
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