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수평원관군상(水平圓管群上)의 이원흡수용액유동(二元吸收溶液流動)에 의(依)한 전달흡수특성(傳達吸收特性)
김석현,김영인,서석청,황동곤,Kim, S.,Kim, Y.I.,Seo, S.C.,Hwang, D.K. 대한설비공학회 1988 설비저널 Vol.17 No.5
Condensation of water vapor into an absorbent liquid of LiBr-water solution falling over a bank of water cooled horizontal tubes was investigated theoretically. The governing conservation equation for a re-defined physical transport phenomena were solved numerically using a finite difference method. Raw parameters were used in this study, since reliable experimental data is required prior to a dimensionless parametric study. The average values of wall heat transfer coefficient and interfacial absorption rate were defined to see the system performance. Other parameters include tube diameter, streamwise coordinate (and number of tubes in row), mass flow rate, and the wall temperature. The effects of these quantities on the absorption processes and suggestions for a rational system design have been presented.
과배란유도시 혈중 CA-125 농도 변화가 체외수정시술 결과에 미치는 영향에 관한 연구
김석현(SH Kim),이배훈(BH Lee),서원석(WS Seo),김미하(MH Kim),지병철(BC Jee),서창석(CS Suh),최영민(YM Choi),김정구(JK Kim),문신용(SY Moon),이진용(JY Lee) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.8
Cancer antigen 125 (CA-125) is a glycoprotein surface antigen expressed in the organs deriving from coelomic epithelium. The elevated serum levels of CA-125 can be found in patients with various malignancies including ovarian cancer, and in women with benign gynecological conditions such as endometriosis, uterine myoma, ovarian cyst, and pelvic inflammatory disease which mostly may be associated with infertility or subfertility. It is well known that the peritoneal irritation and endometrial pathology causing the elevated serum levels of CA-125 may influence on the outcome of assisted reproductive technology (ART). The objective of this retrospective clinical study was to evaluate the influence of serum CA-125 level change in controlled ovarian hyperstimulation (COH) on the outcome of in vitro fertilization and embryo transfer(IVF-ET). From January to July, 1997, 45 infertile patients undergoing COH for IVF-ET were classified into two groups: Group Ⅰ-31 patients with post-stimulation vs. basal serum CA-125 level ratio <1.0, and Group Ⅱ-14 patients with post-stimulation vs. basal serum CA-125 level ratio ≥1.0. The clinical characteristics of patients and the outcome of IVF-ET were statistically analyzed and compared. There were no significant differences in the age of patients, the duration, type and etiology of infertility, the number of previous IVF-ET cycles, and the basal serum FSH level between two groups. There were also no significant differences in the cancellation rate of COH, the peak serum estradiol (E2) level, the numbers of oocytes retrieved and embryos transferred, and the fertilization rate between two groups. The implantation rate per embryo and the clinical pregnancy rate (PR) per cycle and ET were 7.1%, 19.4% (6/31), and 20.7% (6/29) in Group I, and 5.6%, 28.6% (4/14), and 28.6% (4/14) in Group Ⅱ, respectively, and they showed no significant differences. In addition, the ongoing PR per cycle and ET were not significantly different in two groups. In conclusion, the change of serum CA-125 level in COH does not give any predictive information on the outcome of IVF-ET, and COH for IVF-ET may have no detrimental effects on the pathophysiology of various infertility factors associated with the elevated serum levels of CA-125.
김석현(Suhk Hyun Kim),서종석(Jong Seok Seo) 한국농업경제학회 2000 農業經濟硏究 Vol.41 No.3
Accurate characterizations of crop yield distributions are critical for crop insurance rate making as well as agricultural risk management. The yield distribution functions of 10 major crops (rice, barley, naked barley, red pepper, garlic, onion, radish, Chinese cabbage. apple, and pear) were estimated and presented by the producing region. Unlike typical approaches, which have been based on explicit assumptions about the yield probability density function, this article selects the form of distribution that fits best to the actual distribution of crop yields. For the sample period of 1991 to 1998, logistic distribution was found best to fit to the most cases.
김석현(Seockhyun Kim),서태건(Taegun Seo),김정태(Jeong-tae Kim),송달호(Dalho Song) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.5
알미늄 압출재는 고속열차의 경량화를 위하여 기존의 주름강판을 대체하여 널리 사용된다. 알미늄 압출재는 고속열차 적층재 가운데 가장 큰 차음 기여도를 보이나, 동일한 중량의 평판과 비교할 때, 국부공진 주파수 대역에서 투과손실이 크게 떨어진다. 이 연구에서는 차세대 400㎞/h급 고속철도 차량용 알미늄 압출재를 대상으로 차음 문제를 검토하고, 차음성능의 향상 방안을 제시한다. 코어 구조를 변경시켜 국부공진 대역을 높이고, 우레탄 폼을 코어에 충진시킬 때의 차음성능 향상효과를 실험적으로 확인한다. 최종적으로 제시된 방법이 바닥 적층재의 총 투과손실을 어느 정도 개선시키는가를 평가한다. Aluminum extruded panels are widely used instead of corrugated steel panels for weight reduction in high-speed trains. Of the layers in the train body, it makes the largest contribution to the sound insulation. However, compared with that of a flat panel with the same weight, the TL of the aluminum extruded panel is remarkably lower in the local resonance frequency band. We study aluminum extruded panels for next-generation 400-㎞/h trains. We investigate the problem of sound insulation and propose a practical method to improve the sound-insulation performance. The local resonance frequency region is increased by a modification of the core structure, and urethane foam is placed in the core. The effect on the sound insulation is verified by experiments. Finally, the improvement for the entire sound-transmission loss is estimated for the layered floor panels of express trains.
제3차 대한간학회 춘계학술대회 초록집 : 포스터연제 토의 ; B형 만성활동성간염 환자에서 합성 인터페론( INTRON A(R))의 용량에 따른 부작용과 치료효과의 비교
김석현 ( Kim Seog Hyeon ),성재규 ( Seong Jae Gyu ),이상우 ( Lee Sang U ),이경태 ( Lee Gyeong Tae ),이승민 ( Lee Seung Min ),이병석 ( Lee Byeong Seog ),서광식 ( Seo Gwang Sig ),김진희 ( Kim Jin Hui ),김남재 ( Kim Nam Jae ),이헌영 ( 대한간학회 1997 Clinical and Molecular Hepatology(대한간학회지) Vol.3 No.2(S)
김석현(Suhk Hyun Kim),서종석(Jong Seok Seo) 한국농업경제학회 2001 農業經濟硏究 Vol.42 No.3
An appropriate ratemaking procedure is essential for establishing an actuarially sound crop insurance system. All-risk crop insurance premium rates for 10 major crops (rice, barley, naked barley, red pepper, garlic, onion, radish, chinese cabbage, apple, and pear) are estimated and presented by producing regions. The rates are based on 8-year data of crop yields, which follow the logistic distribution in most cases. Methods of estimating loss costs and aggregating groups of similar risks are also discussed for the efficient operation of the crop insurance system.