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      • 有限要素法을 利用한 平面問題의 彈塑性 解析과 極荷限重 解析

        金東燮 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.1

        검수삭제 A method is proposed for the solution of the elastic-plastic problems using finite element method. In most of papers dealing with this method, limit loads of notched and circular hole tension specimen are always higher than maximum possible loads. The present approach tries to correct this discrepancy, so add correction factor to the calculated limit load by finite element method and compares with Hill's solution.

      • KCI우수등재

        혼합냉매를 사용한 열펌프 시스템의 성능과 열전달 특성

        김동섭,신지영,노승탁,Kim, T.S.,Shin, J.Y.,Ro, S.T. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.4

        A heat pump system is constructed to evaluate its performance and heat transfer characteristics with mixtures of R22/R142b as working fluids. The heat transfer in the evaporator and the overall performance are measured and analyzed in terms of the compositions and relevant variables. Possibility of capacity modulation by changing composition is observed without degradation of heat transfer coefficients and coefficient of performance. The cooling capacity is varied continuously within 200 percent based on minimum capacity at constant compressor speed. For similar cooling capacity, COP is improved by mixing two refrigerants and shows maximum value at 60% mass fraction of R22. Average heat transfer coefficients of mixtures decrease in comparison with pure refrigerants at similar cooling capacity and mass flow rate. However, the overall heat transfer coefficients decrease moderately. A cycle simulation is performed in order to manifest the advantages of using refrigerant mixtures, considering experimentally observed heat transfer characteristics.

      • KCI등재

        고효율 단결정 실리콘 태양전지

        김동섭,조은철,조영현,민요셉,이수홍,Kim, D.S.,Cho, E.C.,Cho, Y.H.,Ebong, A.U.,Min, Y.S.,Lee, S.H. 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.2

        단결정 실리콘 태양전지는 PESC(Passivated Emitter Solar Cell), PERC(Passivated Emitter and Rear Cell), Point Contact Cell, PERL(Passivated Emitter and Rear Locally-Diffused Cell) 형태로 기술적인 발전을 해왔다. BCSC(Buried Contact Solar Cell)는 낮은 제조 단가로 높은 효율을 얻을 목적으로 개발되었으며 개량된 형태인 DSBC(Double Sided Buried Contact Cell)는 양면으로 빛을 흡수할 수 있는 장점이 있다. Since PESC(passivated emitter solar cell) was developed in 1985, high efficiency silicon solar cell technology based on planar technology has been improved in the order of PERC, Point Contact Solar Cell, PERL. BCSC and DSBC, which do not require photolithography, are expected to replace commercial screen printed cells because of its potential for low cost and high efficiency. In this paper, history and characteristics of each type of cells are reviewed.

      • SCOPUSKCI등재
      • KCI등재

        소아환자에서의 A군 사슬알균 혈류감염: 단일기관 연구

        김동섭,Kim, Dongsub 대한소아감염학회 2020 Pediatric Infection and Vaccine Vol.27 No.2

        목적: A군 사슬알균은 소아 환자들에 있어서 흔한 감염원으로 다양한 임상양상을 보인다. 급성편도염이나 피부 및 연조직 감염이 흔하며 상당한 이환율과 사망률을 동반하는 혈류감염 또한 발생할 수 있다. 본 연구는 국내 소아 A군 사슬알균 혈류감염 환자들의 임상양상과 치료 결과를 확인하고자 하였다. 방법: 이 연구는 단일기관의 후향적 연구로, 2000년 1월부터 2016년 12월까지 A군 사슬알균 혈류감염으로 입원치료 받은 18세 이하 소아 환자들을 대상으로 하였다. 균혈증 발생시 임상양상, 기저질환, 중환자실 치료 여부, 그리고 균주의 항생제 감수성을 조사하였다. 결과: 19명에서 A군 사슬알균 혈류감염이 확인되었다. 10명(53%)이 남자였으며 연령의 중앙값은 7.4세였다(범위, 0.3-17.4세). 14명(74%)의 환자들이 만성 기저질환을 가지고 있었다. 5명(26%)은 면역저하(백혈병 및 만성신질환) 환자였다. 8명(42%)이 림프낭종, 혈관종, 정맥 기형 등 림프관 및 혈관 기형이 있었으며 그 중 7명은 발열과 병변부 국소 염증소견이 있었다. 3명(16%)의 환자들에게 폐렴이 발생했고 이 중 2명은 인공호흡기 치료를 받았다. 환자들의 30일째 사망률은 6% (1/19)였으며 해당 환자는 균혈증을 동반한 폐렴으로 사망하였다. 모든 검출된 A군 사슬알균은 페니실린에 감수성을 보였다. 15균주(79%)는 에리스로마이신과 클린다마이신에 감수성을 보였다. 결론: 본 연구에서 A군 사슬알균 혈류감염이 발생한 소아 환자들의 임상양상을 분석하였다. A군 사슬알균은 소아에 있어 균혈증을 유발할 수 있는 심각한 감염의 원인균으로 고려가 필요하다. Purpose: Group A streptococcus (GAS) is a common pathogen in pediatric patients and often causes acute pharyngotonsillitis and skin and soft tissue infections. In addition, bacteremia with significant morbidity and mortality can also occur. This study was conducted to describe the clinical manifestations and treatment outcomes of pediatric GAS bacteremia patients in Korea. Methods: This was a single-center, retrospective study. From January 2000 to December 2016, pediatric patients aged ≤18 years with GAS bacteremia were studied. Clinical manifestations, underlying diseases, intensive care unit stay, and antibiotic susceptibility were evaluated. Results: During the study period, 19 patients had GAS bacteremia. Ten (53%) were male, and the median age was 7.4 years (range, 0.3-17.4 years). Fourteen (74%) had chronic underlying diseases. Five (26%) were immunocompromised (leukemia and chronic kidney disease). Eight (42%) had lymphatic or vascular malformations, of which seven had lesions with signs of inflammation. Three (16%) developed pneumonia, and two of them received ventilator care. The 30-day mortality rate was 6% (1/19), and the cause of death was bacteremic pneumonia. All GAS isolates were sensitive to penicillin. Fifteen (79%) were sensitive to both erythromycin and clindamycin. Conclusions: This study identified various clinical manifestations of GAS bacteremia. GAS should be considered as a potential pathogen that can cause bacteremia and result in a serious clinical course.

      • 신세대 대학생의 도덕의식 조사 연구

        김동섭 公州大學校 産業開發硏究所 1998 産業開發硏究 Vol.6 No.-

        Undergraduates who were born in Korea in 1970's have different moral consciousness comparing to one their parent's generation because of the rapid growth of economy and introduction of various kinds of foreign culture. This study is based on a survey from 500 of undergraduates, who are from all over the country and attending the Kongju National University, and a statistical analysis with significance level of 5% was performed. According to the survey, the undergraduates showed healthy moral consciousness on contrary to what had been expected and it can be summarized as follows; 1)the spirit of filial piety and respect should not be changed. 2)the degree of respect toward elderly people is still very high. 3)deep concering about supporing elderly parents was observed, 4)the most popular desired number of children is two. 4)to promote public welfare for popular desired number of children is two. 5) to promote public welfare for elderly people, enhancing the public welfare system and promoting nationwide attention toward respecting elderly ones were chosen as major concerns, and 6) as issues need to be stressed for moral education for the youngsters, manners related to respecting elderly ones, respecting others and selecting polite terms and keeping promises and time were chosen. Based on the study, in order to promote the moral consciousness of the undergraduates with changes of the times, establishing solid policies and showing concerns and guidance from the older generation are desired.

      • KCI등재

        RAW264.7 대식세포에서 괭생이 모자반 추출물의 면역활성 증진 효과

        김동섭,성낙윤,박상윤,김건,엄지,유진곤,서인라,한인준,조용백,김경아 한국영양학회 2018 Journal of Nutrition and Health Vol.51 No.6

        Purpose: Sargassum horneri (S. horneri) is a species of brown macroalgae that is common along the coast of Japan and Korea. The present study investigated the immuno-modulatory effects of different types of S. horneri extracts in RAW264.7 macrophages. Methods: S. horneri was extracted by three different methods, hot water extraction, 50% ethanol extraction, and supercritical fluid extraction. Cell viability was then measured by MTT assay, while the production levels of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and nitric oxide (NO) were measured by enzyme-linked immunosorbent assay and Griess assay, respectively. The expression and activation levels of inducible NO synthase (iNOS), mitogen-activated protein kinase (MAPK) and nuclear factor κB (NF-κB) were examined by western blot analysis. Results: The three different S. horneri extracts were nontoxic against RAW 264.7 cells up to 50 μg/mL, among which treatment with hot water extract (HWE) of S. horneri significantly enhanced the production of TNF-α, IL-6, and NO in a dose-dependent manner. Hot water extract of S. horneri also increased the expression level of iNOS, suggesting that up-regulation of iNOS expression by HWE of S. horneri was responsible for the induction of NO production. In addition, treatment of RAW 264.7 macrophages with HWE of S. horneri increased the phosphorylation levels of ERK, p38 and JNK. Furthermore, the activation and subsequent nuclear translocation of NF-κB was enhanced upon treatment with HWE of S. horneri, indicating that HWE of S. horneri activates macrophages to secrete TNF-α, IL-6 and NO and induces iNOS expression via activation of the NF-κB and MAPKs signaling pathways. Conclusion: Taken together, these findings suggest that HWE of S. horneri possesses potential as a functional food with immunomodulatory activity. 본 연구에서는 모자반목 모자반과 갈조류인 괭생이 모자반의 3가지 서로 다른 추출물의 면역활성 가능성을 비교연구하기 위하여 RWA264.7 대식세포에 서로 다른 괭생이 모자반 추출물을 처리하여 TNF-α, IL-6 및 NO 분비능과 MAPK 신호전달경로 및 NF-κB 활성화 수준을 측정하였다. 괭생이 모자반 열수추출물, 주정추출물, 그리고초임계추출물 중 괭생이 모자반 열수추출물이 세포독성은없는 농도 (50 μg/mL)에서 TNF-α, IL-6의 생성뿐만 아니라 iNOS 활성화를 통한 NO 분비를 촉진하였다. 이러한괭생이 모자반 열수추출물의 면역증진 효과는 MAPK 신호전달경로 및 NF-κB 활성화를 통해 이루어지고 있음을확인하였다. 본 연구결과는 괭생이 모자반 열수추출물의면역활성 증진 가능성을 제시하여 향후 대식세포의 활성유도를 통한 면역증진 치료에 유용하게 사용될 수 있음을보여주는 것이다.

      • SCOPUSKCI등재

        정익 후연의 냉각유체분사를 포함한 축류터빈단의 성능해석

        김동섭,김재환,노승탁,Kim, Tong Seop,Kim, Jae Hwan,Ro, Sung Tack 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.7

        In this work, an aerothermodynamic calculation model for cooled axial flow turbine blades with trailing edge ejection is suggested and a mean line performance analysis of a turbine stage with nozzle cooling is carried out. A unique model regarding the interaction between coolant and main gas is proposed, while existing correlations are adopted to predict viscous loss and blade outflow angle. The interactions considered are the heat transfer from main gas to coolant and the temperature and pressure losses by the mixing of two streams due to the trailing edge coolant ejection. For a stator blade without ejection, trailing edge loss calculated by the trailing edge analysis is compared with that calculated by loss correlation. The effect of heat transfer effectiveness of coolant passage on the mixing loss is analyzed. For a model turbine stage with nozzle cooling, parametric analyses are carried out to investigate the effect of main design variables(coolant mass flow ratio, temperature and ejection area) on the stage performance.

      • SCOPUSKCI등재

        액화천연가스의 냉열을 이용한 가스터빈의 성능향상

        김동섭,노승탁,이우일,최만수,고상근,Kim, Tong Seop,Ro, Sung Tack,Lee, Woo Il,Choi, Mansoo,Kauh, Sang Ken 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.5

        This work describes analysis on the effect of inlet air cooling by the cold energy of liquefied natural gas(LNG) on the performance of gas turbines. Gas turbine off-design analysis program to simulate the influence of compressor inlet temperature variation is prepared and an inlet air cooler is modeled. It is shown that the degree of power augmentation is much affected by the humidity of inlet air. If the humidity is low enough, that is the water content of the air does not condense, the temperature drop amounts to $18^{\circ}C$, which corresponds to more than 12% power increase, in case of a $1350^{\circ}C$ class gas turbine with methane as the fuel. Even with 60% humidity, about 8% power increase is possible. It is found that even though the fuel contains as much as 20% ethane in addition to methane, the power improvement does not change considerably. It is observed that if the humidity is not too high, the current system is feasible oven with conceivable air pressure loss at the inlet air cooler.

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