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용융전로(熔融轉爐)슬래그와 $C_3A(3CaO{\cdot}Al_2O_3)$ 펠렛사이의 계면반응(界面反應)
김영환,고인용,Kim, Young-Hwan,Ko, In-Yong 한국자원리싸이클링학회 2005 資源 리싸이클링 Vol.14 No.5
As a basic study for recycling molten converter slag as an ordinary portland cement (OPC) by a conversion process, the reaction mechanism and the rate of the formation of $C_4AF$ which is one of the main components of OPC were investigated. The converter slag whose basicity was controlled by adding reagent grade $SiO_2$ was melted and hold for 30 minutes in MgO crucible at $1300^{\circ}C{\sim}1350^{\circ}C$. Then, the sintered CaO pellet heated at the same temperature was dipped into the molten slag and hold for $10{\sim}30$minutes. After the reaction, the crucible was cooled in air and the specimen was cut off to the horizontal direction of the crucible. The dissolution rate of $C_3A$ pellet was measured by the change of radius of the sintered $C_3A$ pellet, and the formed phase of $C_4AF$ was observed by SEM/EDX. As a result, the dissolution rate of $C_3A$ pellet into molten slag was increased from $0.75{\times}10^{-4}(cm/sec)$ at $1300^{\circ}C$ to $1.67{\times}10^{-4}(cm/sec)$ at $1350^{\circ}C$, and the mixed layer of $C_4AF$ and $C_{12}A_7$ was found between slag and $C_3A$ pellet. 용융전로슬래그를 일반 포틀랜드 시멘트로 활용하기 위하여, 용융슬래그와 $C_3A(3CaO{\cdot}Al_2O_3)$가 반응하여 시멘트의 구성상인 $C_4AF$가 생성되는 기구와 생성속도를 조사하고자 한다. 전로슬래그에 소정의 $SiO_2$를 첨가하여 MgO도가니에 넣고 $1300^{\circ}C{\sim}1350^{\circ}C$에서 30분간 가열 용해하여 균질화 한 후, 같은 온도로 가열해 둔 소결 $C_3A$펠렛을 투입하여 $10{\sim}30$분간 반응시켰다. 반응 후, 급냉한 시편을 도가니의 직경방향으로 절단해서 펠렛 단면의 $C_3A$직경 변화를 측정하여 $C_3A$의 용해속도를 조사하고, 계면반응 생성상을 SEM/EDX로 관찰하였다. 그 결과 $C_3A$ 펠렛의 슬래그로의 용해속도는 $1300^{\circ}C$에서 $0.75{\times}10^{-4}(cm/sec)$으로부터 $1350^{\circ}C$에서 $1.67{\times}10^{-4}(cm/sec)$으로 증가하였으며, 슬래그와 $C_3A$ 펠렛 사이에 $C_4AF$와 $C_{12}A_7$의 혼합층이 생성됨을 알 수 있었다.
김영환,유기준,신만용 ( Young Hwan Kim,Ki Joon Yoo,Man Yong Shin ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.3
The objective of this study was to present the proper criteria which could be efficiently used for dividing the land-use zones in Korean national parks. Delphi technique was employed to collect data for this study. The Delphi process was designed with 3 round questionaries for Korean panel experts. A list of 30 criteria was obtained to be considered in dividing land-use zones. From the results, the biological category, in which 10 criteria were involved, occupied the most part of them. This means that the panels consider the biological criteria to be the most important ones under the serious situation of environmental deterioration. Using the 30 criteria emerged from this study, it could be possible to analyze the fitness of the existing land-use zoning system. Prior to the application of these criteria to each park, however, the areal characteristics should be surveyed to select the proper criteria. The new zoning system based on the regional characteristics of each park could be efficiently utilized for management of Korean national parks.
용융전로(熔融轉爐)슬래그와 CaO펠렛의 상호반응(相互反應)에 미치는 $Al_{2}O_{3}$의 영향(影響)
김영환,고인용,Kim, Young-Hwan,Ko, In-Yong 한국자원리싸이클링학회 2006 資源 리싸이클링 Vol.15 No.2
용융전로슬래그로부터 일반 포틀랜드 시멘트로의 전환에 관한 기초 연구의 일환으로, 전로슬래그의 $Al_{2}O_{3}$ 농도에 따를 고체 CaO 입자와 용융슬래그간의 계면반응을 알아보고자 하였다. 염기도($B=CaO/SiO_2$)를 1과 2로 조정한 전로슬래그에 소정의 $SiO_2$와 $5{\sim}15wt%\;Al_{2}O_{3}$를 첨가제로 첨가하여 MgO도가니에 넣고 $1500^{\circ}C$에서 30분간 가열 용해하여 균질화 한 후, 같은 온도의 소결 CaO펠렛을 투입하여 $10{\sim}30$분간 반응시켰다. 반응 후 급냉한 시편을 도가니의 직경방항으로 절단해서 펠렛 단면의 CaO직경 변화를 측정하여 슬래그중 $Al_{2}O_{3}$첨가에 따른 CaO의 용해속도를 조사하고, 계면 생성층을 SEM/EDX로 관찰하였다. 그 결과, 슬래그의 염기도가 2인 경우, 염기도가 1인 경우 보다 생성층 $C_{3}S$상의 두께는 $Al_{2}O_{3}$를 15wt.%까지 첨가함에 따라 3.5배 증가하였으며, $C_{6}AF_{2}$ 또는 $C_{4}AF$양도 2배 정도 증가됨을 알 수 있었다. As a basic study on the conversion of molten converter slag to the ordinary portland cement, the effects of $Al_{2}O_{3}$ addition on the interface reaction between solid CaO and molten converter slag has been studied. Alumina added converter slag whose basicity was controlled to 1 and 2 was melted and hold for 30 minutes in MgO crucible at $1500^{\circ}C$. Then sintered CaO pellet heated at the same temperature was dipped into the molten slag and held for 30minutes. After the reaction, the crucible was cooled in air and the specimen was cut off to the horizontal direction of the crucible. The dissolution rate of CaO pellet with the addition of $Al_{2}O_{3}$ was measured by the change of the radius or sintered CaO pellet and the interface layer was observed by SEM/EDX. As a result. At the basicity 2 slag, thickness of created $C_{3}S$ layer increased 3.5 times and quantity of $C_{6}AF_{2}\;or\;C_{4}AF$ phase increase 2 times than baisicy 1 slag.
논문(論文) : 『유문사친(儒門事親)』에 나타난 장종정(張從正)의 치료법(治療法)에 관(關)한 연구(硏究)
김영환 ( Yong Hwan Kim ),이상협 ( Sang Hyup Lee ),김중한 ( Joong Han Kim ) 대한한의학원전학회(구 대한원전의사학회) 2012 대한한의학원전학회지 Vol.25 No.3
Objective : Methods of Jang Cong-zheng`s treatment related to his theories include of promoting the sweating-vomiting-purgation(汗吐下三法), prickling-bleeding method(瀉血療法), and emotional therapy(情志療法). He succeeded Liu wan-su(劉完素) as promoter of fire-heat pattern theory(火熱論), thereby emphasizing six qi(六氣), especially fire(火) and dampness(濕), as pathogens. He suggested that physician should treat patients whose diseases occurred due to fire(火) and dampness(濕) with promoting the sweating(汗)-vomiting(吐)-purgation(下) methods, which would remove pathogen qi(邪氣) and help circulation of qi and blood, therefore getting them back healthy qi(正氣). Method : I will try to describe the Jang Cong-zheng`s treatment in 『Ru-Men-Shi-Qin』, and I would like to explain the sweating-vomiting-purgation(汗吐下三法), prickling-bleeding method(瀉血 療法), and emotional therapy(情志療法). Result : For emotional diseases, he suggested that most should be caused by heart fire(心火) so they should be treated with methods of suppressing heart fire and medication would be using cool and cold herbal drugs which lead to clear heart fire. Conclusion : Theories of Zhang zi-he(張子和) can be applied to nurturing for modern world maintaining and improving health by his care methods. People these days suffer usually from excess intake or unbalanced diet problem, so wastes matter and pathogenic qi can be driven out of the human body by applying the sweating-vomiting-purgation methods. His medical theories could contribute to modernization of traditional medicine this way.
호두까기 식도증과 동반된 Steakhouse Syndrome 1 예
김영환(Young Hwan Kim),채현석(Hiun Suk Chae),김순섭(Sun Sub Kim),이태규(Tae Kyu Lee),이동건(Dong Gun Lee),추교영(Kyo Young Choo),김병욱(Byung Wook Kim),김성수(Sung Soo Kim),한석원(Sok Won Han),이창돈(Chang Don Lee),최규용(Kyu Yong Ch 대한소화기기능성질환·운동학회 2001 Journal of Neurogastroenterology and Motility (JNM Vol.7 No.2
The most common type of food-related foreign body in esophagus is impacted meat bolus and sudden esophageal obstruction after eating poorly chewed meat has been called the steakhouse syndrome . It is frequently caused by underlying esophageal stenosis including abnormal ring, the sequalae of reflux esophagitis, malignancy and rarely esophageal motility disorders. A 55-year-old male patient was admitted to our hospital complaining swallowing difficulty after ingestion of a lump of chicken 3 days ago. Impacted meat bolus was found at distal esophagus on emergency endoscopy. However, there was no definite anatomical stenotic lesion after removal of meat with the polypectomy snare. Esophageal manometry showed segmental, high amplitude of esophageal pressure at lower esophagus with normal peristalsis and occasional triple peaked waves. The manometry finding was consistent with nutcracker esophagus. We report a case of steakhouse syndrome associated by nutcracker esophagus without abnormality on endoscopy and esophagography. (Korean Journal of Gastrointestinal Motility 2001;7:233-238)
임분 수확예측 모델을 이용한 간벌 시나리오별 목재수확량 예측
김영환 ( Hwan Kim Young ),김태욱 ( Tae Wook Kim ),원현규 ( Hyun Kyu Won ),이경학 ( Kyeong Hak Lee ),신만용 ( Man Yong Shin ) 한국산림과학회 2012 한국산림과학회지 Vol.101 No.4
Forest stand yield and its changes along with 10 thinning scenarios were estimated using a forest stand yield model for six major tree species in Korea such as Pinus densiflora in Gangwon province pinus densiflora in other regions pinus koraiensis Larix leptolepis quercus acutissima carruth quercus mongolica. The 10 thinning scenarios were generated based on a number of constraints and assumptions. For instance it was assumed that thinning is implemented between 15 years and 40 years with 5 year period and its duration should be at least 10 years. Also the overall removal rate from the thinning treatments was assumed to be not greater than 60%. Under the 10scenarios the overall stand yield volume from thinning and final harvesting were estimated for each species and site index. The results showed that highest yield volumes were obtained for Pinus densiflora in Gangwon province Pinus koraiensis and Quercus mongolica when 30% of basal areas were thinned at 20 and 40years while highest yield volumes were obtained for Pinus densiflora in other regions and Larix leptolepis when 20% of basal areas were thinned at 20 30 and 40 years. Those two scenarios gave the same amount of highest yield volume for quercus acutissima carruth. Also the results indicated that thinning treatment is effective to increase overall stand yield volume and its effects are larger with a higher site index. The largest thinning effects were found in pinus densiflora in Gangwon province (28%) and larix leptolepis (25%) while in pinus koraiensis (12%). The forest stand yield model used in this research could be an effective tool for estimating the stand dynamics with various thinning treatments but it could be improved in a further research that validates its applicability in the field.