SI 엔진의 헤드와 블록에 대한 온도 분포 해석 및 측정

김광현(G.H.Kim),박정규(J.K.Park),권남진(N.J.Kwon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2

This is a study for the prediction of engine temperature distribution using the finite element method. And then results of this simulation will be verified by experimental results. High power and high efficiency is required in internal combustion engine. And high power increases pressure and temperature in combustion chamber. Therefore. engine block and cylinder head must have high reliability from thermal stress more than before. Hence, it is necessary to evaluate heat transfer and thermal behavior of engine. The difficult problem of 3-dimensional temperature distribution analysis is to determine boundary condition for solving Laplace equation. In this study, for the calculation of temperature distribution of engine, the cycle simulation in combustion chamber which is used to find heat transfer coefficient and ambient temperature is necessary. The temperature distribution of each part of engine can be obtained by using the heat transfer coefficient and ambient temperature as boundary condition. The purpose of this study is to analyze, by the finite element method, 3-dimensional temperature distribution of engine head and block.<br/>

알칼리장석-일라이트가 육용오리의 생산성 및 육질에 미치는 영향

국길,김정은,정진형,김재필,선상수,김광현,정완태,정광화,안종남,이병석,정일병,양철주,양재은,Kook K.,Kim J. E.,Jeong J. H.,Kim J. P.,Sun S. S.,Kim K. H.,Jeong Y. T.,Jeong K. H.,Ahn J. N.,Lee B. S.,Jeong I. B.,Yang C. J.,Yang J. E. 한국가금학회 2005 韓國家禽學會誌 Vol.32 No.4

본 연구는 3주령의 육용오린 사료에 알칼리장석-일라이트를 0, 0+ 항생제, 0.5, 1.0 및 $1.5\%$ 첨가한 5처리구에 3반복으로 각각 12수씩 배치하여 43일간 급여하여 생산성 및 육질에 미치는 영향을 알아보고자 실행하였다. 육성오리의 일당 증체량은 알칼리장석-일라이트 1.0와 $1.5\%$ 첨가구에서 약간 증가하였다(p>0.05). 사료섭취 량은 알칼리장석-일라이트 첨가구에서 증가하는 경향이었다(p>0.05). 혈중 글루코스 농도는 알칼리장석-일라이트 $0.5\%$ 처리구에서 약간 감소한 반면에(p>0.05) 혈중 요소태 질소 함량은 알칼리장석-일라이트 $0.5\%$ 첨가구에서 유의적으로 증가하였다(p<0.05). 콜레스테롤 함량은 알칼리장석-일라이트 $0.5\%$ 첨가구에서 유의적으로 감소하였다(p<0.05). 도체중과 도체율은 알칼리장석-일라이트 첨가수준에 따라 증가하는 경향이었다(p>0.05). 알칼리 장석-일라이트 급여에 의한 육용오리 가슴육의 조지방 함량은 알칼리장석-일라이트 $1.5\%$ 첨가구에서는 유의적으로 감소하였다(p<0.05). 육색의 명도와 황색도는 알칼리장석-일라이트에서 높게 나타났으며(p>0.05), 콜레스테롤 함량은 알칼리장석-일라이트 첨가구에서 감소하였다(p>0.05). 지방산 패도는 알칼리장석-일라이트 첨가구에서 약간 감소하였다(p>0.05). 알칼리장석-일라이트 첨가에 의한 포화지방산 비율이 약간감소하는 경향인 반면에 불포화지방산 비율이 약간 증가하는 경향을 나타내었으나 유의적인 차이는 없었다(p>0.05). 알칼리장석-일라이트 첨가에 의한 육성오리 간의 중금속 함량은 납 축적량이 비교적 높게 나타났다(p>0.05). 관능 평가(appearance)에서 알칼리장석-일라이트 1.0와 $1.5\%$ 첨가구에서 외관의 유의적인 개선 효과를 나타내었다 (p<0.05). 이상의 결과를 종합해 볼 때 육성오리에 대한 알칼리장석-일라이트 급여는 증체량의 개선효과와 더불어 가슴육의 조지방 함량의 감소 그리고 관능평가에서 외관의 개선 효과가 있음을 알 수 있었다. This experiment was conducted to investigate the effect of the supplemental alkali feldspar-ilite(feldspar) on growth performance and meat quality in broiler ducks for 43 days. One hundred eighty broiler ducks were divided into 5 groups of 12ducks. Dietary levels of feldspar 0, 0+antibiotics, 0.5, 1.0 and $1.5\%$ were added to experimental diets of each of the groups. Daily weight gain was slightly increased in 1.0 and $1.5\%$ feldspar treatments. Feed intake was slightly increased at all feldspar treatments. Glucose concentration of serum profile was decreased whereas BUN concentration was significantly increased (p<0.05) at $0.5\%$ feldspar. Cholesterol concentration was decreased at all feldspar treatments, this difference was especially observed in supplemental levels of $0.5\%$ feldspar(p<0.05). Carcass weight was increased at all feldspar treatments. Moisture and crude fat contents of proximate chemical composition in duck meat were decreased at all feldspar treatment, this difference especially was observed in supplemental levels of $1.5\%$ feldspar(p<0.05) on crude fat content. Lightness and yellowness was increased at all feldspar treatment. Cholesterol contents and TBA in meat were decreased, but this parameters were not difference by feldspar treatment. The composition of saturated fatty acids(SFA) was decreased, whereas unsaturated fatty acids(USFA) was slightly increased by feldspar treatment. The Pb content of heavy metal concentrations was increased with compared control, but not difference. The appearance of sensory evaluation was improved by supplemental feldspar, especially in supplemental feldspar, 1.0 and $1.5\%$(p<0.05). The results of this study indicate that the supplemental alkali feldspar may improve the production and meat quality of broiler ducks.

FPGA 를 활용한 롤링 머신 유압 비례 제어기 개발

권순묵(S. M. Kwon),이홍철(H. C. Lee),김광현(K. H. Kim),성낙문(N. M. Seong) 한국정밀공학회 2014 한국정밀공학회 학술발표대회 논문집 Vol.2014 No.5월

국소 진행성 구강암에서 선행 항암 화학 요법의 효과

조요한(Yo Han Joh),최인실(In Sil Choi),이근욱(Keun Wook Lee),오도연(Do Youn Oh),김병수(Byung Su Kim),이대호(Dae Ho Lee),김태유(Tae You Kim),방영주(Yung Jue Bang),우홍균(Hong Gyun Wu),성명훈(Myung Whun Sung),이철희(Chul Hee Lee),김광현(N 대한두경부종양학회 2001 대한두경부 종양학회지 Vol.17 No.2

Objective: The role of chemotherapy in locally advanced head and neck cancer has been established in nasopharynx and larynx as definitive therapy and organ preserving therapy, respectively. Oral cavity cancers are relatively uncommon and local recurrence is the main cause of treatment failure. We planned this retrospective study to evaluate the role of neoadjuvant chemotherapy in locally advanced oral cavity cancer patients. Materials and Methods: From 1988 March to 2001 February, locally advanced, previously untreated oral cavity cancer patients who received neoadjuvant chemotherapy were examined. Chemotherapy had been done in the following patients: Histologically proven squamous cell or poorly differentiated carcinoma, stage 3 or 4, and performance state 0-2 patients. Chemotherapy regimen consisted of cisplatin and infusional 5-fluorouracil. Response was evaluated after 2 cycles and in case of no response, definitive local therapy was done; otherwise 3 cycles was done before local treatment. Results: 48 patients were treated and 47 patients were evaluable for responses. Complete response rate was 6.4%(3/47) and partial response 80.0%(38/47), scoring overall response rate of 87.2%. Median time to progression was 27.0 months (95% CI : 0-58months) and overall 5 year survival was 54.8%. 5-year disease-free survival in the patients in remission after local treatment was 51.9%. In multivariate analysis, contributing factor to the survival were response to neoadjuvant chemotherapy and local treatment modalities. Extensive surgery was done in 10 patients and 25 patents (52.1%) was followed up with preserved function. With median follow-up of 57.0 months, 19 recurrences were detected, most of which were local or regional type. Conclusion: Neoadjuvant chemotherapy followed by local treatment in oral cavity cancer showed high response rate and was thought to be effective therapeutic approach especially in view of organ preservation.

Delta-endotoxin proteins associated with spherical parasporal inclusions of the four Lepidoptera-specific Bacillus thuringiensis strains

Kim, K.-H.,Wasano, N.,Ohba, M. 동의대학교 기초과학연구소 1999 基礎科學硏究論文集 Vol.9 No.1

Four Lepidoptera-specific reference strains of Bacillus thuringiensis, belonging to serovars sumiyoshiensis(H3a:3d), fukuokaensis(H3a:3d:3e), darmstadiensis(H10a:10b) and japonensis(H23), which produce spherical parasporal inclusions, were examined for comparative characterization of δ-endotoxins. SDS-PAGE profiles of the alkali-solubilized parasporal inclusions revealed the presence of single major protein bands of 130 kDa in the four strains. Chymotrypsin and trypsin treatment of the proteins gave profiles different from those of the strains HD-1(serovar kurstaki, H3a:3b:3c) and T84Al(serovar sotto, H4a:4b). Also, minor variations were observed in proteolysis profiles among the four strains. The LC_50 values of purified parasporal inclusions for the silkworm(Bombyx mori) larvae were 7·35, 6·45, 3·08 and 2·63 ㎍ g^-1 diet, respectively, showing that their toxicity levels were 5-15 times lower than that of the strain HD-1 (0·49㎍ g^-1 diet). Analysis by immunodiffusion and immunoblotting with polyclonal antisera revealed that parasporal inclusion proteins of the four strains are highly related, whereas they shared few or no common anitgens with those of the strains HD-1, T84Al and Buibui(serovar japonensis).