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이인섭,유홍선,김원배,양제복,Lee, In-Sub,Ryou, Hong-Sun,Kim, Won-Bae,Yang, Je-Bok 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.7
The main objective of the present study is to analyze the heat transfer characteristics in the vacuum carburizing furnace. Local temperatures are measured at different locations in the self-fabricated furnace for various operating conditions using K-type thermocouples. In addition, the present study simulates the fluid flows and heat transfer in the vacuum carburizing furnace using a commercial package (Fluent V. 6.0), and compares the predictions of local temperatures with experimental data. The temperature and flow fields are predicted. It is found that the time taken for reaching the steady-state temperature under the vacuum pressure is shorter than that under the normal pressure condition. It means that the carburizing furnace under vacuum pressure condition is capable of saving the required energy more efficiently than the furnace under the normal pressure condition. Furthermore, the temperature variations predicted by the numerical simulations are in good agreement with experimental data.
석면분석 정도관리용 표준시료 개발연구 II - Amosite 및 Chrysotile 표준시료 평가 -
이광용,윤충식,한진구,윤문종,정시정,이종한,이인섭,박두용,Yi, Gwang Yong,Yoon, Chung sik,Han, Jin Ku,Yun, Moonjong,Jung, Sijeong,Lee, Jong Han,Lee, In Sub,Park, Doo Yong 한국산업보건학회 2009 한국산업보건학회지 Vol.19 No.3
We conducted validation for asbestos quality control (QC) samples made by the developed method which was presented in our published paper. The main results of the validation study are as follows. The pooled coefficient variations of analytical results in three different concentrations (low, medium, and high concentration) for amosite and chrysotile were less than 20 %, which met the sample homogenicity criteria of NIOSH. Also we confirmed the homogenicity of asbestos samples by using the relocatable field slide. To evaluate the field applicability of the developed asbestos QC samples, the field validation was performed with four proficient asbestos analysts by using the statistical methods of AIHA asbestos PAT program. All analytical results from four asbestos analysts were located in the acceptable range.
室素의 處理水準이 옥수수 種子의 發牙, 幼植物의 初期生長 및 炭素, 水素, 室素含量에 미치는 영향
이인섭 慶星大學校 1998 論文集 Vol.19 No.2
Response of Korean maize(Chungdae waxy corn) line to applied nitrate levels for germination, early growth and content of carbon, hydrogen and nitrogen were compared to that of control. The results obtained were as follows. Germination rate was 100% at control, and 28% at 20㏖·m? of applied nitrate concentration. Germination rate was sharply decreased with increased applied nitrate concentration. Plant height of maize plant grown for 4 weeks after sowing was 56.9㎝ at control, 58.9㎝ at 1㏖·m? and 54.4㎝ at 10㏖·m? of applied nitrate concentration, respectively. Fresh weight and dry weight showed the same tendency, their measured values were high at 1㏖·m? concentration and low at 101㏖·m? concentration. Carbon content was the highest at control and the lowest at 11㏖·m? concentration. Hydrogen and nitrogen content were the highest at 101㏖·m? concentration and the lowest at control. But there is no significant difference among the treatment at the content of carbon, hydrogen and nitrogen.