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김대호,최용우,성춘호,정운혁 대한마취과학회 1988 Korean Journal of Anesthesiology Vol.21 No.2
During surgical repair of a descending thoracic aorts aneurysm, one-lung ventiation improves visualization of the surgical field, facilitates surgical resection, and reduces lung tranuma. Trauma to the left lung during surgical repair of the descending thoracic aorta is very common, and intrapulmonary hemorrhage can be occurred if both lungs are ventilated. A doubitus position, hypoxemia can frequently occur and hypoxic damage can result. Selective nondependent lung high frequency jet ventilation was administered using a MERA JET VENTILATOR with FiO_2 1.0, driving gas pressure 1 kg/㎠, respiration rate 120/min., and an I:E ratio of 1:2. Oxygenation (PaO_2 readings were all above 200 torr) was well maintanined and PaCO_2 values were all within normal limits thoroughout the operation. Under the left atrial-femoral artery bypass with the cardiopulmonary bypass machine without oxygenator, an internal bypass graft with Woven dacron was performed. The patient tolerated the surgery well, and the postoperative course was uneventful except for left for left vocal cord paralysis.
휴대인터넷 시스템의 레인징 정보를 이용한 상향링크 부채널 할당 및 전력제어 알고리즘
김대호,김환우,Kim, Dae-Ho,Kim, Whan-Woo 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.9a
본 논문에서는 OFDMA/TDD 방식을 사용하는 휴대 인터넷 시스템에서 상향링크 부채널 할당 및 전력제어 알고리즘의 설계 및 구현에 대하여 살펴보았다. OFDMA 시스템에서 단말기의 송신전력은 기지국보다 낮게 설계되지만 단말기는 기지국과 같이 최소 1개부터 최대일 때 부채널 전부를 사용할 수 있기 때문에 부채널 전부를 사용할 수 있는 거리(FLR : full loading range)의 제한이 생기고 FLR 바깥에 위치한 단말은 기존의 개방루프 전력제어 방식을 사용할 수 없는 문제가 발생한다. 본 논문에서는 OFDMA 시스템의 ranging 정보를 이용하여 단말기의 위치를 파악하고 단말기의 위치에 따라서 사용가능한 부채널수를 제한하고 PCG(power concentration gain)를 인가하는 방식을 제안하였다. 시뮬레이션을 통한 실험결과에서 제안된 방식은 상향링크 통화반경을 셀 경계지역까지 확보하면서 무선자원의 최적 활용이 가능하며 FLR 바깥에서 상향링크 전력제어가 별도의 하드웨어 없이 가능함을 확인하였다. In this paper, we introduce a new approach for the design of uplink sub-channel allocation and power control in the High-speed Portable Internet system that is based on OmMAnDD scheme. In OFDMA system, because the number of allocated sub-channel in mobile station varies from one to the whole sub-channel as in base station while mobile station's transmit power is lower than that of base station, full loading range(FLR) constraint occurs where whole sub-channel can be used and the conventional open-loop power control scheme can not be used beyond FLR. We propose a new scheme that limits the maximum sub-channel allocation number and uses power concentration gain(PCG) depending on location of mobile station, which is based on ranging in OfDMA system. Simulation results show that the proposed scheme extends the uplink coverage to the entire cell service coverage area, provides solutions for optimum utilization of radio resource and enables open-loop power control beyond FLR without extra hardware complexity.
Acetaldehyde가 생쥐의 發生系의 미치는 影響에 關한 形態學的 硏究
金大昊,文蓮子,禹元洪,朴承澤,鄭然泰 圓光大學校 醫科學硏究所 1987 圓光醫科學 Vol.3 No.2
In an attempt to elucidate the effect of Acetaldehyde on the development of mouse early embryo, the two-cell stage was cultured for 72 hours in the medium containing various concentrations of Acetaldehyde. Cytotoxicity of Acetaldehyde was studied for the embryonal cells differentiated from two-cell stage to blastocyst in the Acetaldehyde contained medium. The following results were obtained. 1. When two-cell stage was cultured for 72 hours at various concentrations of Acetaldehyde, the development of early embryos was suppressed remarkably at 2.5×10 exp (-4) M of Acetaldehyde. 2. Acetaldehyde decreased the number of embryos developed to blastocysts, dose-dependently and the longer the embryos exposed to Acetaldehyde, the more injury appeared. 3. Cytotoxicity of Acetaldehyde was pronounced such a morphological changes as cytolysis, fusion, developmental retardation and fragmentation of blastomeres, dose-dependently in the embryonal cells damaged to Acetaldehyde. From the above results, it is suggested that Acetaldehyde might have a toxic effect on the development of mouse early embryo by inhibiting the cleavage of embryonal cell.