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황선태,이종찬,양상국,김홍섭,노용수 건국대학교 의과학연구소 1996 건국의과학학술지 Vol.5 No.-
Vesicovaginal fistula is a distressing complication which may follow hysterectomy, prolonged labor, chemical cauterization due to uterine prolapse, radiation therapy and cervix cancer. The management of vesicovaginal fistula still remains controversial in regard to the type of approach and timing of repair but the classic opinion is to wait 3 to 6 months to allow the surgical inflammatory reaction to subside. We experienced 4 cases of vesicovaginal fistula which were as follows; Case 1: 51-year-old The vesicovaginal fistula, about 3.0cm in diameter, after laparascopic hysterectomy 15 days ago was repaired with interposition of a gracilis muscle flap via the transvaginal route. Case 2: 38-year-old The vesicovagianl fistula, about 2.5cm in diameter, after Cesarean section 5 years ago was repaired with interposition of the omental flap via the transabdominal route because she had been accompanied by an overian cyst. Case 3: 46-year-old The vesicovaginal fistula, about 2.5cm in diameter, after manual self abortion at home 30 years ago was repaired with interposition of fibro-fatty tissue in labia via the transvaginal route. Case 4: 43-year-old The vesicovaginal fistula, about 2.0cm in diameter, after prolonged labor 12 years ago was repaired with interposition of the fibro-fatty tissue in labia via the transvaginal route. There noted no complications or recurrence during the minimal 1 year follow-up.
The Influence of Dielectric Constant on Ionic and Non-polar Interactions
Hwang, Kae-Jung,Nam, Ky-Youb,Kim, Jung-Sup,Cho, Kwang-Hwi,Kong, Seong-Gon,No, Kyoung-Tai Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.1
This work is focused on analyzing ion-pair interactions and showing the effect of solvent induced inter-atomic attractions in various dielectric environments. To estimate the stability of ion-pairs, SCI-PCM ab initio MO calculations were carried out. We show that the solvent-induced attraction or ‘cavitation' energy of the ion-pair interactions in solution that arises mainly from the stabilization of the water molecules by the generation of an electrostatic field. In fact, even the strong electrostatic interaction characteristic of ion-pair interactions in the gas phase cannot overcome the destabilization or reorganization of the water molecules around solute cavities that arise from cancellation of the electrostatic field. The solvent environment, possibly supplemented by some specific solvent molecules, may help place the solute molecule in a cavity whose surroundings are characterized by an infinite polarizable dielectric medium. This behavior suggests that hydrophobic residues at a protein surface could easily contact the side chains of other nearby residues through the solvent environment, instead of by direct intra-molecular interactions.
P2P 구조에 기반한 인터넷 방송 시스템 설계 및 구현
우문섭 ( Moon-sup Woo ),정원태 ( Won-tai Jung ),김남윤 ( Nam-yun Kim ),황기태 ( Ki-tae Hwang ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.1
클라이언트-서버 구조의 스트리밍 시스템은 서버의 가용 능력에 따라 클라이언트의 개수가 제한되는 단점을 가진다. 본 논문에서는 인터넷 방송 시스템의 확장성과 안정성을 지원하기 위해 P2P에 기반한 모델을 제시한 후, 프로토타입 시스템을 설계 및 구현하였다. 본 논문에서 구현한 시스템 OmniCast264는 H.264 비디오 스트림을 제공하는 인코딩서버와 스트리밍서버, 피어노드, 프록시 서버로 구성된다. OmniCast264는 스트리밍 부하의 분산화, 실시간성, 에러 발생에 따른 강건함, 계층의 모듈화등의 개념을 가지고 있기 때문에 대용량의 인터넷 방송에 적합하다고 할 수 있다. 마지막으로 PC들을 병렬 및 직렬 구조의 유형으로 나누어 P2P를 구성한 후, OmniCast264의 성능을 평가하여 실시간 재생이 가능함을 검증하였다.
노영수,박치형,황선태,김홍섭 건국대학교 의과학연구소 1994 건국의과학학술지 Vol.4 No.-
Intrascrotal hemangioma is very rare, benign vascular tumor characterized by soft and spongy like compressible vascularity. It is primarily composed of large venous channel occuring in the deep dermis and subcutaneous tissue, first reported by Robert in 1851. Complications of intrascrotal hemangioma include thrombosis, phlebitis, massive hemorrhage, and infertility. The treatment of choice is wide local excision of the tumor with the overlying skin. We have experienced a case of intrascrotal cavernous hemangioma who was a 24-year old man with painful scrotal mass and reported with literatures.