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유명열(MY Yu),이헌영(HY Lee),장종성(CS Chang),최성기(SK Choi) 대한산부인과학회 1968 Obstetrics & Gynecology Science Vol.11 No.2
Spontaneous rupture of the gravid uterus is infrequent and the combination with placeta percreta as the cause is extremely rare, but it is one of the most serious problem in clinical view-point of obstetrics. We present a case of spontaneous rupture of uterus due to placenta percreta which was 16th weeks gestation, and bave reviewed literature brietly.
유명열(MY Yu),장종성(CS Chang),함종국(JK Hahm),박경희(KH Park) 대한산부인과학회 1968 Obstetrics & Gynecology Science Vol.11 No.5
2 Case of Omphalocele are presented and the literatures on the Omphalocele are briefly reviewed
유명열(Yu Myoung-Youl),이재용(Lee Jae-Yong),최응규(Choi Eung-Kyoo),이현수(Lee Hyun-Soo) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.7
Carbonation does not cause deterioration of concrete but damage on durability of concrete because of corrosion of steel embedded in hydrating cement paste. In order to prevent reinforcing steel from corrosion, it is very important to maintain passivation by measurement of the depth of carbonation and repair. Laboratory techniques that can be used to determine the depth of carbonation are indicators, X-ray diffraction, infra-red spectroscopy and thermogravimetric analysis, etc. In those methods, phenolphthalein method is most useful in practical measurement because the method is easy and rapid to perform despite low reliability. Even though researches, which are carried out to improve the reliability of phenolphthalein method through standardization of usage, are being conducted, phenolphthalein method still has potential problems. 1) It is impossible to measure the degree of early carbonation and 2) the quantity of OH- with varying depth because the pink color indicates the presence of Ca(OH)2 in accordance with pH 8.9. In this study, many indicators are selected and applied to improve the reliability of phenolphthalein and solve the potential problems.
천연골재, 부순골재, 순환골재의 혼합비율에 따른 혼합 잔골재의 성능평가
유명열(Yu Myoung-Youl),이재용(Lee Jae-Yong),정철우(Chung Chul-Woo) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.11
The resources of natural fine aggregate started to decrease due to the increase in the amount of construction. In addition, it becomes more difficult and less economical to dispose used concrete structure because of the environmental concerns. The use recycled aggregate from the demolished concrete to produce new concrete, therefore, becomes an important issue in the concrete industry. Currently, the recycled aggregates are often used as a source of fine aggregate after some mechanical treatment, but the application to the concrete is limited by the lack of the confidence in the quality of recycled fine aggregate. In most cases, recycled fine aggregate is used as a source of blending fine aggregates, not by itself. Although the standard specification for quality evaluation of the blended aggregates is available, it is still difficult to use blended aggregates in the construction field due to absence of quality management procedure. Therefore, this research especially focuses on the estimation of the properties of the fine aggregate blended by 3 different aggregates. The estimation of properties based on the individual properties of each aggregates was performed using linear interpolation, and compared to the measured values from blended aggregates. The results indicate that the properties of blended fine aggregates can be successfully calculated based on their individual properties.
한조영(C.Y. Han),박응식(E.S. Park),전형열(H.Y. Jeon),유명종(M.J. Yu) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
Thermofluid flow analysis is major subject in most computational fluid dynamics applications. Accompanying convective and conductive heat transport phenomena, radiation plays an important role in high temperature operating systems. Cases in which the radiation dominates are found in such systems as boilers, furnaces, rocket engines, etc. In this paper the finite-volume method (FVM) are employed to simulate two-dimensional radiation problems in concentric and eccentric horizontal cylindrical annuli with general body-fitted coordinates. In thai case the simplest and intuitive remedies are proposed for mitigation of ray effect.
3종 혼합 잔골재를 사용한 굳지 않은 모르터의 성능 평가
유명열(Yu Myoung-Youl),이재용(Lee Jae-Yong),정철우(Chung Chul-Woo) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.1
The use recycled aggregate from the demolished concrete started to draw attention from concrete industry due to the economical and environmental concerns. The main use of recycled aggregate is to substitute for the coarse aggregate, but it is also used for the source of fine aggregate. However, the application of recycled fine aggregate to the concrete is still limited by the lack of the confidence in the quality of concrete. The available information from current research suggests the recycled fine aggregate to be substituted to natural fine aggregate for certain content, not recommended to use it by itself. Considering the lack of natural aggregate sources, the use of recycled fine aggregate needs to be promoted, for example, by blending it with other aggregates from various sources. To provide the guiding information for such applications, this research focuses on the investigation of mortar using fine aggregates from three different sources. The use of mortar is to remove the effect of coarse aggregate, and to efficiently evaluate the effect of blended fine aggregates to the properties of the mixture. Only fresh properties were investigated in this research, and the result indicated that the mortar flow was affected by the surface condition rather than the type of fine aggregate. The air content increased as the amount of porous recycled fine aggregate in the mixture increased. The unit weight was shown to be solely affected by the bulk specific densities of fine aggregates.
이산요소법을 이용한 다단 임팩트 파쇄기 내 입자 거동 모사
유명열,이훈,Yu, Myoungyuol,Lee, Hoon 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.3
The amount of construction waste generated is steadily increasing every year, and the Law for Promotion of Recycling is enacted. However, it is difficult to use it as a recycled aggregate for concrete, which is presented in the quality standard of recycled aggregate with high water uptake and low density due to low separation of aggregate between concrete and cement paste. Therefore, in this study, a multi-stage impact crusher was used to remove mortar, which is essential for improving the quality of recycled aggregate. In analyzing the characteristics of the equipment, the spectrum of energy generated in each part between the particle and the equipment was calculated by using DEM. In order to generate an effective separation phenomenon, it was confirmed that the operation condition of 900 RPM was appropriate based on the ratio of the number of collisions (L/H) of the low energy group (L) to the number of collisions of the high energy group (H).