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이종석,전대근,김석준,이수용,양현석,Lee, Jong-Seok,Jeon, Dae-Geun,Kim, Sug-Jun,Lee, Soo-Yong,Yang, Hyun-Seok 대한근골격종양학회 1997 대한골관절종양학회지 Vol.3 No.1
PURPOSE : For the reconstruction of large bone defect after tumor resection, it is possible to reuse the bone involved by tumor with some treatment to it. Several bone-reusing methods have been reported such as autoclaving, low-heat treatment(pasteurization) and intraoperative radiotherapy. We have used extracorporeally radiated autogenous bone graft for reconstruction after tumor resection, and analyzed the periods for junctional union, functional results and complications to know the indications of this method. METHODS : From Dec. 1993 to Sept. 1995, nine patients had taken autogenous bone graft with extracorporeal irradiation. Eight cases were osteosarcoma and 1 giant cell tumor. The graft sites were 5 in femur, 3 proximal tibia and 1 femur and tibia. Stage 3 was 1 case(GCT), Stage IIB 3 and Stage IIIB 5. After wide resection, surrounding soft tissue and intramedullary and extramedullary portion of the tumor were removed. Radiation was done in 5000cGy to the resected bone. Ender nails and bone cement were inserted and filled into the medulla to prevent fracture. RESULTS : Average follow-up period was 12.3(4 to 21) months. Average junctional union period in simple X-ray was 6.5 months in 4 cases. Average functional score following Enneking's criteria was 19(12-27). Complications were as follows ; condylar fractures and femur neck fracture in 4 cases, subluxation of the knee joint 3 and infection 1. Although local recurrence was detected in 1 case, the site of recurrence was not in the radiated bone but surrounding soft tissue. At final follow-up, no recurrence was found in one case(GCT), CDF 2, AWD 2, DOD 3, and died of chemotherapy related sepsis 1. CONCLUSIONS : Extracorporeally radiated bone autograft is considered to be a method for reconstruction of the large bone defect made by tumor resection, especially in the reconstruction around the joint.
온수양생을 이용한 초고강도 콘크리트의 강도 조기 추정에 관한 실험적 연구
이종석,명로언,공민호,백민수,이영도,정상진,Lee, Jong-Seok,Myung, Ro-Oun,Gong, Min-Ho,Paik, Min-Su,Lee, Young-Do,Jung, Sang-Jin 대한건축학회 2011 대한건축학회논문집 Vol.27 No.5
In this study, prediction of later-age compressive strength of ultra-high strength concrete, based on the accelerated strength of concrete cured in hot water was investigated. Comparing other acceleration method, hot water curing method is relatively easy and intuitive to use in the real construction site. The amount of time for evaluation of the concrete strength using the hot water curing method in KS and JIS is too long to predict the strength of the ultra-high strength concrete that are used in the tall building structure. For that reason, curing temperature of 40, 50, $60^{\circ}C$ 3 levels were examined to shorten the amount of time for the evaluation of the strength. When curing in warm water, different strength characteristics are verified from the experiment. In case of F3 substituting 30% fly ash in combination, because of the curing temperature sensitivity of fly ash, differences of strength expression velocity was verified according to the curing temperature at the same age. In case of B4 substituting 40% ground granulated blast furnace slag, there were no big strength expression velocity differences of the specimen cured in 3 different level of curing temperature(40, 50, $60^{\circ}C$). The results show reliable accuracy by regression relation between 28day strength cured by standard curing method and accelerated strength of concrete cured in warm water.(y=1x-0.0002 $R^2$=0.9866) As a result, the feasibility of 3day-prediction was confirmed using warm water curing method with accelerated strength of concrete cured for three days in warm water.
이종석,김진규,차영기,Lee, Jong-Seok,Kim, Jin-Gyu,Cha, Yeong-Gi 한국수자원학회 1996 물과 미래(한국수자원학회지) Vol.29 No.1
충적수로에서 유사량의 정량적인 산정은 초기운동개념이나 유사이송개념에 의한 방법에 기초하여 구하고 있다. 본는 연구에서는 유사이송개념에 의한 결정방법중의 하나인 회귀분석법에 의해 총유사량을 산정할 수 있는 유사농도에 관한 관계식을 유도하였다. 관계식의 유도에는 135개의 현장자료와 225개의 실험자료가 포함된 360개의 실측자료가 이용되었다. 또한 다중회귀분석법에 의한 관계식은 수심, 평균유속, 수로경사, Froude 수 및 하상재료의 중앙입경을 독립변수로 하여 유도되었다. Quantitative computation of sediment discharge in alluvial channels is conducted by the determined method based on the incipient motion or the sediment transport concept. The derived formulation of sediment concentration in this study was developed in order to compute the total sediment discharge by a regression analysis method, one of the determined methods by the sediment transport concept. The used data set in derived formulation consists of the total 360 data including 135 and 225 measured data in natural channels and experimental channels, respectively. Also, the formulation by the multiple regression analysis was composed of independent bariables of flow depth, mean velocity, channel slope, Froude number and median diameter in bed materials.
PIN 다이오드 - PNP 트랜지스터 결합모델에 의한 1,700 V급 NPT 트랜치 IGBT의 해석에 관한 연구
이종석,경신수,강이구,성만영,Lee, Jong-Seok,Kyoung, Sin-Su,Kang, Ey-Goo,Sung, Man-Young 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.10
This paper presents a comprehensive mathematical analysis and simulation of trench IGBT with the help of PIN-PNP combinational model. Since trench IGBT is characteristically influenced by PIN diode, it may be almost impossible to analyze the trench IGBT using PNP-MOS modeling methods, even PIN-MOS techniques which neglect the hole current components coming into p-base region. A new PIN-PNP complementary cooperational model is developed in order to make up the drawbacks of existing models. It would allow us to make qualitative analysis as well as simulation about switching and on-state characteristics of 1,700 V trench IGBT. Moreover, if we improve the PIN diode effects through the optimization of trench structure, trench IGBT is expected to be one of the most promising devices in the not only high-voltage but also high speed switching device field.