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안성태 ( Sung Tae Ahn ),이용주 ( Yong Joo Lee ),백광제 ( Kwang Je Baek ),김준식 ( Jun Sik Kim ),이일근 ( Il Keun Lee ),하충건 ( Choong Kun Ha ) 대한응급의학회 1997 대한응급의학회지 Vol.8 No.1
A case of survivor who showed alpha coma after an attempted suicide by hanging was reported. A 44 years old women was admitted to the hospital because of respiratory arrest following a hanging attempt on July 3, 1996. She was found pendant completely. On admission she was comatose and the pupils were not reactive to light. The systolic pressure was 100 mmHg, and diastolic pressure was 80mmHg and she had no self respiration and immediately an endotracheal intubation was instituted. After three hours from the onset, the weak spontaneous respiration was restored and the pupils reacted briskly to light. On the 1st day the brain computed tomography (CT) revealed no abnormal findings. An electroencephalogram (EEG) showed widespread alpha activity without occipital dominance a moderate amount of regular, 8 approximately 10 Hz, 10 approximately 30 microvolt potentials. This alpha rhythm had persisted until 24 hours from the onset. At 36 hours later she was still comatose, presenting flaccid quadriplegia with no responses to stimulations. On the 2nd hospital day she was drowsy and on the 3rd day she had become conscious. She showed gradual progress towards complete nerologic recovery. This is the first presentation of a survivor from alpha coma caused by anoxic encephalopathy following a hanging attempt in Korea.
임상연구 : Desflurane 흡입마취 시 Remifentanil 지속정주가 기도반응성에 미치는 효과
안성태 ( Sung Tae Ahn ),이정한 ( Jeong Han Lee ),정순호 ( Soon Ho Cheong ),이근무 ( Kun Moo Lee ),이상은 ( Sang Eun Lee ),김영환 ( Young Hwan Kim ),임세훈 ( Se Hun Lim ),최영균 ( Young Kyun Choe ),김영재 ( Young Jae Kim ),신치만 ( 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.53 No.4
Background: Because desflurane can cause airway reactivity, the use of opioids are aimed at its reduction. This study was designed to evaluate the effect of continuous remifentanil infusion on the airway reactivity during desflurane inhalation. Methods: 108 adult ASA physical status class I patients were enrolled in this study. The patients were divided into four groups. The breathing circuit was primed with 8 vol% desflurane in 3 L/min each of N2O and O2. Anesthesia was induced with 0.2 mg/kg of intravenous etomidate. After 2 minutes, either 20 ml/hr saline, or 0.15, 0.25 or 0.35μg/kg/min remifentanil, groups S, R1, R2 and R3, respectively, was infused. Each patient inhaled the gas mixture through a tight fitting facemask. During this period, the coughing, secretions, breathing hold, laryngospasms, excitatory movements and hemodynamics were measured. Results: The coughing, spasms, secretions and excitatory movements were significantly lower in the remifentanil than the saline infusion group (P<0.05). However, the breathing hold was significantly higher in group R3 (P<0.001). The mean arterial pressure and heart rate were more stable in groups R1 and R2. Conclusions: These results demonstrate that groups R1 and R2 had significantly reduced airway reactivity, with stabilize hemodynamics, during desflurane inhalation. (Korean J Anesthesiol 2007; 53: 448~52)
반응성 단량체로서의 고순도 로진 - 말레산 부가물의 합성
최형기,김점식,안성태 ( Hyeong Ki Choi,Jum Sik Kim,Sung Tae Ahn ) 한국공업화학회 1994 공업화학 Vol.5 No.2
로진과 말레산무수물로부터 rosin-maleic anhydride adduct(RMA)를 합성하였다. 중합반응의 단량체로서 이용하기 위한 고순도의 RMA의 합성에는 정재공정을 수반하는 용융합성법과 정제공정이 불필요한 용액합성법을 이용하였다. 용액합성법에서 합성한 RMA의 수율이 용융합성법보다 높았다. 용융합성법의 최고수율은 40%였으나 사염화탄소 및 아세트산을 반응용제로하는 용액합성법에서 얻은 생성물의 수율과 순도를 검토한 결과 비교적 고순도의 RMA를 얻을 수 있었고, 수율은 사염화탄소 용제법의 경우 48%(이론수율 87.6%), 아세트산 용제법의 경우 51% (이론수율 94%)였다. Rosin-maleic anhydride adduct(RMA) was synthesized from rosin and maleic anhydride. Highly purified RMA for the application of polymerization monomer was synthesized by means of two methods ; the melt reaction followed by further purification and the solution reaction. As a result of this study, the solution reaction was better than the melt reaction for obtaining higher yield of RMA. Maximum yield of RMA obtained by the melt reaction was only 40%. But the yield of RMA obtained by the reaction in carbon tetrachloride solution was 48% (theoretical yield 87.6%) and that obtained by the reaction in acetic acid solution was 51.5% (theoretical yield 94%) respectively.
김정수,안성태 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1
In this study, dynamic responses of catenary system that supplies electrical power to high-speed trains are investigated. A simulation program based on 3-span and 6span finite element models of TGV-K catenary is developed. The influences of the various design parameters on the dynamic responses of the catenary are determined. The main design parameters include tension on the contact and messenger wires, the flexural rigidity and damping of these wires, and the stiffness properties of the droppers connecting the two wires. Modal analysis is performed for various parameter values, and the natural frequencies and mode shapes are compared. Impulse responses are also obtained to determine dominant frequency components of the catenary response. Finally, the responses of the 3-span and 6-span models are compared.
1540 ℃ 에서 W-Ni-Fe 3 원상태도의 열역학적 계산
안성태 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.11
Liquids-α two phase region of W-Ni-Fe system at 1540℃ has been calculated thermodynamically from ternary regular solution model of Meijering, Kaufman and Bernstein. The results have been compared with the experimental liquidus line and the solidus line calculated from experimental liquidus data and two equations of ternary equilibrium conditions. The deviation between the calculated and the experimental liquidus lines becomes greater as the Fe/Ni ratio increases, which is expected to be resulted from the simplified ternary regular solution model. The two solidus lines show relatively good agreement, especially when Fe/Ni ratio is low.
안성태,윤용구,김광범 대한금속재료학회(대한금속학회) 1983 대한금속·재료학회지 Vol.21 No.1
Crevice corrosion properties of Ti-0.2 wt.% Pd alloy and pure Ti in hot 6% NaCl solution were investigated. Pure Ti specimens exhibited severe corrosion, while Ti-0.2% Pd alloy specimens were virtually immune to crevice corrosion in an accelerated test. An electrochemical polarization technique was used to determine the effect of Pd-addition to Ti. It was found that Ti-0.2% Pd alloy retained passivity in an acid solution of the same concentration developed in the crevice. This result indicates that Pd acts as a cathodic depolarizer to shift the potential of Ti in the noble direction. It is therefore concluded that small addition, namely, 0.2% of Pd effectively improves the resistance of Ti to crevice corrosion in a hot brine.
안성태,김지혜,백광제,김준식,한승백,신동운,김아진 대한외상학회 2001 大韓外傷學會誌 Vol.14 No.2
Spontaneous spinal epidural hematoma is a rarely occurring condition. The cause is unknown, but most authors suggest that bleeding from the venous epidural plexus is the cause. The classical clinical picture is that of acute onset of severe, often radiating, back pain followed by signs and symptoms of rapidly evolving nerve root and/or spinal cord compression. Emergency surgical evacuation is the standard treatment, but conservative treatment is also useful. We experienced two cases of acute spontaneous spinal epidural hematoma that was resolved by surgical treatment.
사망 예측 모델 (Mortality probability Model 2) 을 이용한 중환자 사망분석
안성태,이준희,백광제,김준식,한승백,신동운,김아진 대한외상학회 2001 大韓外傷學會誌 Vol.14 No.2
Background: The mortality probability model(MPM) II is a system that can predict the mortality of intensive care unit patients and calculate a mortality probability for each patients and each intensive care unit. Thus, it can be used for quality assessment of intensive care units. To determine the validation and usefulness of the MPM II model, we calculated expected mortality probabilities for real intensive care unit patients by using the MPM II model, and we compared the results with the observed mortality. Materials and Methods : One hundred ICU patients (males 69, females 31, average age 59.5±16.2 years old) who were admitted to intensive care units were included for study. Among the 100 patients, 48 patients survived, and 52 patients expired in the hospital. MPM_0 (a mortality probability at ICU admission) and MPM_(24)(a mortality probability at 24 hr after admission) were calculated. Results: Both the MPM_0 and the MPM_(24) have an excellent ability to predict mortality (Hosmer-Lemeshow goodness of fit tests, p=0.4955 (MPM_0), p=0.8226 (MPM_(24)) and to discriminate death from survival (area under the ROC curve=0.919 (MPM_0), 0.956 (MPM_(24)). The observed mortality was larger than the expected mortality in both the MPM_0 and the MPM_(24). Conclusion: As a result of above, the MPM II model has an excellent power of mortality prediction and discrimination and can be a useful tool for quality assessment of intensive care units.