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개에서 양 확산성 호흡법이 심폐혈역학 및 산소운반능에 미치는 영향
박남훈,김성덕,정익수,박재현 대한마취과학회 1990 Korean Journal of Anesthesiology Vol.23 No.3
VDR (volumetric diffusive respiration) is the newest high-frequency ventilation technique that combines conventional mechanical ventilation (CMV) and IPV (intrapulmonary percussive ventilation), and is also called HFPV (high-frequency percussive ventilation). To evaluate the effects of VDR on cardiopulmonary hemodynamics and oxygenation, we compared VDR with CMV in 8 mongrel dogs. In both groups, ventilation and oxygenation were well maintained and we couldnt find any differences between groups. Hemodynamically there were no significant differences, but diastolic arterial pressure, pulmonary capillary wedge pressure, coronary perfusion pressure, and both right and left ventricular stroke work index were slightly increased. These results suggest that VDR maintains cardiovascular stability, good ventilation and oxygenation, and there are no differences, compared with CMV, in dogs with normal lung.
유무선 복합망에서 이동 단말 기반 핸드오버의 링크 품질에 관한 성능 분석
박남훈,권오준,김영선,감상하,Park, Nam-Hun,Gwon, O-Jun,Kim, Yeong-Seon,Gam, Sang-Ha 한국정보처리학회 2000 정보처리논문지 Vol.7 No.s8
This paper proposes the Handover Scheme for the mobile and describes the result of the performance analysis. In the conventional scheme of handover request, the withdrawal of terminal may occur because handover request is performed based on fixed signal level without considering network load and terminal mobility. The proposed scheme offers the minimization of withdrawal and handover blocking probability by means of the handover request of terminal based on the network load and terminal mobility. Conventional handover scheme has the sequential procedure that network performs resource check and path rerouting on the handover by MT(Mobile Terminal). Proposed handover scheme pre-processes the resource check before the handover request by predicting the handover request timo so that handover latency can be reduced. Moreover, path optimization is executed after the completion of handover in order to reduce handover latency. The rdduction of handover latency prevents the dropping of service by minimizing backward handover blocking. In summary, we propose the prediction of handover request time and decision method based on terminal, validating the performance of proposed scheme considering various cases of simulation. 본 논문은 유무선 복합망에서 이동 단말 기반 핸드오버의 링크 품질에 관한 성능 분석 결과를 제시한다. 기존의 방식은 이동 단말이 핸드오버를 요청 하였을 때 자원 확인 절차와 경로 재설정 절차를 망이 순차적으로 수행하는 방식임으로 망의 부하와 단말의 이동성에 기반하지 않는 고정적인 신호 수준으로 핸드오버를 요청함으로써 단말의 취소 문제를 유발할 수 있다. 그러나 제안된 방식은 이동 단말의 핸드오버 요청 시점을 예측하여 이동 단말이 핸드오버 요구 전에 자원 확인 절차를 선행하여 핸드오버 지연 시간을 감소하고 이동 단말이 망의 부하와 단말의 이동성에 기반하여 핸드오버를 요청함으로써 단말의 취소 문제 발생과 핸드오버 실패율(blocking probability)을 최소화 한다. 또한, 핸드오버 지연 시간 감소를 위해서 경로 최적화는 이동 단말이 핸드오버를 완료한 다음에 수행함으로써 역방향(backward) 링크 연결 실패율을 최소화하여 서비스의 중단을 최소화 한다. 본 논문에서는 이동 단말의 이동성을 고려한 핸드오버 요구 시점 예측과 결정 방법을 제시하고 이에 따른 상/하향 링크의 성능을 검증한다.
무선 ATM LAN 시스템에서 이동 단말에 의한 핸드오버 제어 기법
박남훈,김영선,최준균,감상하,Park, Nam-Hun,Kim, Yeong-Seon,Choe, Jun-Gyun,Gam, Sang-Ha 한국정보처리학회 2000 정보처리논문지 Vol.7 No.4
This paper propose a novel scheme, called Mobiel Terminal Initiated Scheme(MTIS), in which mobile terminal initiates the backward handover by sending handover request message with the list of target radio ports. In this scheme, the old ATM switch suporting end-user mobility, denoted by EMAS\ulcorner, checks whether each EMAS\ulcorner, managing the target radio port, has its available resources. If it has, the EMAS\ulcorner performs the path rerouting between CrossOver Switch (COS) and itself after deciding the most suitable target radio port. Therefore, the MT initiates the handover after deciding the most suitable target radio port through the beacon signal of Wireless Access Point (WAP). The EMAS\ulcorner have only to check the resource availability of the target radio port. It is no need to waste time to decide the suitable target radio port. Also, once receiving the request of the resource availability, the EMAS\ulcorner can reduce the rerouting delay time due to perform the path rerouting to the COS. In comparison with that of the ATM-Forum procedure, our proposed MTIS handover delay time reduced 14~21%, and end-to-end transfer delay time reduced 2~9%, as a result of the simulation.