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송원경 한국지반공학회 1998 지반 : 한국지반공학회지 Vol.14 No.6
본 연구는 우기에 흔히 발생되는 천부 사면파괴와 지표수 침투와의 관계를 규명하기 위한 기초연구로서 수행되었다. 사면이 침투수에 의하여 부분적으로 포화되었을 경우에 토양에 작용하는 응력의 변화를 고찰하고 이와 관련된 사면의 전단강도 이론에 대하여 논의하였다. 그리고 임의의 무한 평면사면에 한계평형법을 적용하여 지표수 침투가 사면의 안정성에 미치는 영향을 분석하였다. 또한 한계평형 해석에서 사용한 일부 모델과 동일한 조건하에서 유한차분법 프로그램인 FLAC을 이용하여 수치해석을 실시하고 그 결과를 한계평형 해석에서 구한 결과와 비교해봄으로써 지표수침투와 사면의 안정성 문제에 관한 수치해석적 접근 가능성을 검토하였다. 본 연구는 단순 사면에 대한 해석결과이므로 보다 일반적인 사면에 적용하기 위해서는 더욱 나은 연구가 수행되어야 할 것이다. Preliminary study has been conducted to analyse the co-relation between shallow landslides frequently occurring in rainy seasons and the water infiltration into the slope. The change of stress state due to partial saturation of a soil and hence the reduction of its shear strength have been reviewed. The variation of the safety factor of an infinite planar slope in accordance with various water infiltration scenarios has been estimated by limit equilibrium method to explain the mechanism of shallow slope failure. Numerical analysis under the same condition as those of some models dealt with in the previous method has been carried out by using FLAC, a finite difference program, and the results have been compared with the ones obtained by limit equilibrium method. Both results proved to be identical, which implies the ability of the numerical approach to the problems related to the stability analysis of unsaturated slope with the irregular geometry. Further improvement, however, should be made to apply the present analysis procedure to general slopes since it deals with a simple one.
굴절교정레이저각막절제술과 레이저각막절삭성형술에서 신경성장인자의 농도와 의미
송원경,이형근,김현창,이성호,김응권,Won Kyung Song,Hyung Keun Lee,Hyeon Chang Kim,Sung Ho Lee,Eung Kwon Kim 대한안과학회 2006 대한안과학회지 Vol.47 No.8
Purpose: To determine whether tear nerve growth factor (NGF) concentration correlates with corneal sensation and ocular surface dryness after photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK). Methods: A prospective, non-randomized comparative clinical trial. Seventy eyes of 35 patients and 76 eyes of 38 patients underwent PRK and LASIK procedures to correct myopia and myopic astigmatism, respectively. Total tear protein level, tear NGF concentration, corneal sensation, tear film break-up time (BUT) and Schirmer values were measured before and 1 day, 1 week, 1 month, 3 months, and 6 months after the surgery. Results: The postoperative mean tear NGF/total tear protein ratio (NGF/tP) increased in both PRK and LASIK patients compared to their preoperative levels (p<0.0001). At 1 week and 1 month postoperatively, the NGF/tP ratio was higher in PRK than in LASIK subjects (p<0.0001). Up to 6 months postoperatively, the mean corneal sensation after LASIK in the ablated zone was lower than the preoperative sensation (p<0.0001), whereas this was not the case in PRK subjects. Mean BUT and Schirmer values were significantly lower in LASIK-treated eyes compared to PRK-treated eyes up to 6 months postoperatively (p<0.0001). The early postoperative tear NGF/tP ratio correlated with the postoperative 6 month corneal sensation, BUT and Schirmer values. Conclusions: The difference in postoperative corneal sensation and ocular surface dryness between PRK- and LASIK-treated eyes was related to the difference in the early postoperative levels of NGF/tP, which implies NGF might influence corneal nerve regeneration after these two surgeries.
가변형주거의 변화과정에 관한 건축계획적 연구 : 상계동J아파트를 대상으로 추적조사 및 생활실태조사의 분석 Focused on the Sanggye-Dong J Apartment
송원경,박태병,박용환 대한건축학회 1999 대한건축학회논문집 Vol.15 No.9
From the beginning, the considering of changing and growth of family members, designing the interior space are applied the flexibility in menu and option system So we make both dwelling changes survey of habitation process and the actual lining conditions of the objects that the re-evaluations of the flexible housing plan through time are to be needed The aims of this study is the study of change m using space and reconstructing case by growing and changing of family members m continuing -habitation crises anti moving m and out cases and to suggest the basic resources and analysing of changing process of flexible housing plan m the way of using space
신생혈관녹내장 환자의 방수내 변형성장인자-β와 혈관내피성장인자 농도와 아메드밸브 수술 결과
송원경,이준행,홍영재,김찬윤,Won Kyung Song,Jun Haeng Lee,Young Jae Hong,Chan Yun Kim 대한안과학회 2006 대한안과학회지 Vol.47 No.4
Purpose: To assess the relationship of transforming growth factor-β (TGF-β) and vascular endothelial growth factor (VEGF) levels in the aqueous humor of neovascular glaucoma (NVG) patients and the results of Ahmed valve implantation surgery. Methods: We compared surgical outcomes of NVG patients who underwent Ahmed valve implant surgery from January 2002 through October 2002 at severance hospital with levels of TGF-β1, TGF-β2 and VEGF in the aqueous humors of these patients. Results: Nineteen eyes (19 patients) were analyzed in the study. The success of surgery was defined as intraocular pressure maintained as 6-20 mm Hg regardless of additional glaucoma medications taken. Twelve eyes (63%) satisfied successful surgery. TGF-β1 concentration was 1.51 ng/ml in the success group and 2.31 ng/ml in the failed group (p=0.295). TGF-β2 concentration was 5.19 ng/ml in the success group and 5.73 ng/ml in the failed group (p=0.367). VEGF concentration was 10.21 ng/ml in the success group and 9.87 ng/ml in the failed group (p=0.516). All showed no statistical difference between the groups. Conclusions: In our study, no significant relationship between levels of TGF-β1, TGF-β2, or VEGF in the aqueous humor and the surgical outcomes of Ahmed valve implantation were found in patients with NVG.
송원경,정소걸,한공창 사단법인 한국터널지하공간학회 2002 한국터널지하공간학회논문집 Vol.4 No.2
This research has been conducted to investigate the influence of mined cavities on a tunnel to be constructed around a coal mine. The location and dimension of cavities were supposed by analysing synthetically geological structures and condition of coal beds as well as gangway map since there does not exist any map describing mined cavities. Detailed geological and geophygical survey have also been carried out for the purpose of understanding the geological structure and rock mass conditions. The two dimensional numerical analysis with FLAC has been performed on the geological sections reconstituted from the obtained information and the affects of mined cavities on the tunnel have been assessed. 본 연구는 석탄광 주변에 건설되는 터널이 채굴공동의 붕락으로 인한 지반침하에 의한 영향을 조사할 목적으로 수행되었다. 채굴적이 표시된 도면이 존재하지 않기 때문에 탄광이 보유하고 있는 갱내도와 함께 지층구조, 탄층의 부존상황을 종합적으로 판단하여 그 위치와 규모를 추정하였다. 또한 정밀 지표지질조사와 지표 전기비저항탐사를 통하여 지층구조 및 암반상태를 파악하였다. 이러한 조사 자료를 바탕으로 터널단면에 따른 지반구조를 구성하였으며 이들 단면에 대한 2차원 수치해석을 실시하여 채굴공동이 터널에 미치는 영향을 분석하였다.