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구혈대가 호기말 이산화탄소 분압과 동맥혈 가스분압에 미치는 영향
이장원,김순임,옥시영,김성열 대한마취과학회 1991 Korean Journal of Anesthesiology Vol.24 No.1
The tourniquet is not only used for facilitation of microaurgery by the bloodless surgical field on the extremities but prepared for the intravenous regional anesthesia and isolation arm test estimated the degree of the neuromuscular transmission in the anesthetic field. On the contrary, there are various complications, such as nerve paralysis and tissue damage from compression, and metabolic and hemodynamic changes from ischemia after application of the tourniquet. Since a sudden increase in PaCO₂ immediately following tourniquet deflation is one of the important factors in the hemodynamic changes, we have observed the ehanges of PaCO₂ and PCO₂, after release of the tourniquet on the upper and the lower extremity under the general anesthesia with enflurane, N2O and respiratory control maintaining PaCO₂ level (35 mmHg). The results obtained were as follows; PETCO₂, PaCO₂ and HCO₂- were significantly elevated to peak level within 1 minutue after tourniquet release on the upper and the lawer extremity, except HCO₂ on the upper extremity, and there were more severe changes on the lower extremity. pH and base excess were reduced to significantly lowest level 1 minutue and 5 minutes after tourniquet release respectively, and their changes were more reduction on the lower extremity. There were no statistically significant variations in PaO₂ on the extremities. In the relationship between tourniquet time and P, it was statistically significant linear on the lower extremity (p$lt;0.05) only. Conlusively, since the sudden changes of PaCO₂, pH and base excess after release of tourniquet are closely related with PaCO₂, on time and degree, noninvasive monitoring of PaCO₂ has rapid interpre- tation to change in PaCO₂ after release of tourniquet.
공연장에서 사용하고 있는 SSR조광기를 새로운 IGBT 싸인웨이브 조광기로 교체시 효율성에 관한 연구
이장원,권혁환 한국인터넷방송통신학회 2015 한국인터넷방송통신학회 논문지 Vol.15 No.3
현재 에너지 절감에 대한 사회적 요구가 높다. 이번 기회에 IGBT 딤머시스템이 기존 SSR,SCR 딤머시스템과 비교하여 얼마만큼의 효율성을 갖는 것에 대한 목적을 가지고 연구를 하였다. 방법은 2가지로 첫째는 디머시스템의 조 광시 출력에 따른 정현파 변형의 비교실험으로 전력손실이 얼마나 나타나는지에 대하여 오슬로스코프로 비교 측정 실 험을 진행하였고, 둘째는 조광시 장비가 갖는 소리에 대한 데시벨 크기를 측정하여 장비 배치에 대한 소음에 대하여 데시벨 측정기로 실험을 진행하였다. 결과는 전력손실에 따른 효율성과 공간에 따른 소음이 많은 SSR,SCR 딤머보다 IGBT 딤머가 효율적이라는 것을 확인 하였다. Today, High Social demand for Energy Saving. This have been Studied for the purpose, Having an Efficiency of much it, in IGBT DIMMER SYSTEM compared to the existing SSR,SCR Dimmer System. The Method Two, The First is Dimming in Dimmer System How much Power loss Appears of A Comparison Experiment According to the output a SINEWAVE Strain, Comparative Measurements Experimental were Conducted with Oscilloscope. Second, When Dimming the sound has equipment by measuring the relative Size Decibel Experiment was conducted in Decibel Meter about the Equipment Noise. Results Thus Confirm SSR,SCR Dimmer IGBT SINEWAVE Dimmer more Efficiently.