http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
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)
金榮煥(Yong Hwan Kim) 한국환경보건학회 1991 한국환경보건학회지 Vol.17 No.1
This thesis is a study on the 마ange and the process of the development of the hygiene administration during the period of modernization of our nation which promoted by the 0야n door policy of our country chiefly under the pressure of the foreign countries. During that period Korea had reorganized the old political system radically and introduced the western medical system. Through the c10se study of literature concerning the system of the hygiene administration, the laws of health and hygiene, the environmental sanitation organizations and their practical activities the author obtained the conc1usions as following ; 1. The government passed around 40 laws of health and hygiene from the time when the bureau of hygiene was founded in 1894 to the annex of Korea to J apan_ Most of the laws were believed to be established by the enforecement of J apanese government. When the epidernics were prevailing, a decree for the prevention of the epidernics was proclairned by the J apanese president of the headquarters of national police. It is shown well that the sovereignty of Korea had been deprived. 2. After the annex of Korea to J apan, the hygiene ∞lice and the general police belonging to the bureau of national police shared the tasks of health and hygiene. This was a temporary sys tem which had existed just during the colonial period . .As for the water-supply which is the most important facility arnong the various environmental hygiene facilities, the rate of supply was rernarkably high in ] apanese rather than in Korean. 3. During the period of American rnilitary adrninistration. it is notable that the division of hygiene in the bureau of national police was replaced by the bureau of hygiene. This period is regarded as the turning point when hygiene adrninistration was operated by means of edu cation along with the introuction of American system of public health.
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.