Energy-Pooling Collision in Cs Atomic Vapor

강훈수,김재필,오차환,김필수 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.2

We observed theuorescence induced by the energy-pooling collision process in a heated Csatomic vapor cell. Theuorescence from the heated Cs atomic vapor cell showed about 30 spectralpeaks, and all the peaks could be assigned to the Cs atomic transition lines. The radiation trappingeffect and the optical thickness of the heated Cs atomic vapor were considered to correctly analyzethe energy-pooling collision process. The ratios of the atomic populations in each level involved inthe energy-pooling collision process was found experimentally. We observed the uorescence induced by the energy-pooling collision process in a heated Cs atomic vapor cell. The uorescence from the heated Cs atomic vapor cell showed about 30 spectral peaks, and all the peaks could be assigned to the Cs atomic transition lines. The radiation trapping effect and the optical thickness of the heated Cs atomic vapor were considered to correctly analyze the energy-pooling collision process. The ratios of the atomic populations in each level involved in the energy-pooling collision process was found experimentally.

복강경 담낭절제술시 아산화질수 50 % 의 투여가 기도내압, 동맥혈가스 및 술후 구토에 미치는 영향

강훈수,박병순,장병환 대한마취과학회 1996 Korean Journal of Anesthesiology Vol.31 No.2

Background: The use of laparoscopic techniques in general surgery has gained increasing popularity. The small, limited incisions are well accepted by patients and there is the benefit of a faster recovery. But the contribution of N₂O to nausea and vomiting is still controversial. This study was undertaken to evaluate the effect of N₂O for airway pressure, blood gas and postoperative emesis in laparoscopic cholecystectomy. Methods: Twenty ASA physical status I, II patients for elective laparoscopic cholecystectomy were randomly divided into two groups. First group(n=lO) of patients was anesthetized with isoflurane(0.5∼1.5 vol%)-O₂(2 l/min)-air(2 l/min). Second group(n=10) of patients was anesthetized with isoflurane(0.5∼1.5 vol%)-O₂(2 l/min)-N₂O(2 I/min). After induction of anesthesia, ventilation was controlled with tidal volume 10 ml/kg and respiratory rate ll/min and not changed throughout the operation. After measuring of control value of PaCO₂, pH and airway pressures before CO₂ insufflation, repeaeasured at 20 min, 40 min after CO₂ insufflation and 10 min after CO2 exsufflation. We observed the patients concerning nausea and vomiting for postoperative period. Results: There were no significant intraoperative differences between the both groups with respect to PaCO₂, pH and airway pressures. In the both groups, PaCO₂ and airway pressure throughout the operation are significantly increased in comparison to control values. The pH is significantly decreased in comparison to control values. The incidence of postoperative nausea and vomiting was similar in both groups. Conclusions: N₂O had no clinically apparent effects on airway pressure, blood gas and postoperation emesis during laparoscopic cholecystectomy.

Esmolol 과 Diltiazem 이 기관내 튜브 발관시 심혈관계 변화에 미치는 영향

강훈수,남대희,박병순 대한마취과학회 1996 Korean Journal of Anesthesiology Vol.31 No.1

Background: Tracheal extubation causes hypertension and tachycardia. In susceptable patients, even this short period of hypertension and tachycardia can result in myocardial ischemia. The purpose of this study was to evaluate the effect of esmolol and diltiazem in attenuating cardiovascular responses to tracheal extubation. Methods: Changes in heart rate, systolic and diastolic blood pressure were measured during extubation and emergence from anesthesia in 60 ASA physical status I patients to assess the effect of esmolol and diltiazem. The patients were randomly assigned to one of three groups (n=20 for each group): saline 5 ml (as a control), 0.2 mg/kg diltiazem and 1.5 mg/kg esmolol. These medications were given 2 min before tracheal extubation. Results: Both groups of diltiazem and esmolol were greater attenuating effect on changes of heart rate, systolic and diastolic blood pressure than control group. The inhibitory effect on changes of heart rate was greater with esmolol than diltiazem, but the attenuating effect on changes of systolic blood pressure was greater with diltiazem than esmolol. Conclusions: We concluded that a bolus dose of intravenous diltiazem 0.2 mg/kg or esmolol 1.5 mg/kg given at 2 min before extubation was of value in attenuating the cardiovascular changes occuring in association with tracheal extubation and emergence from anesthesia. Esmolol is more effective than diltiazem in attenuating the heart rate changes. Diltiazem is more effective than esmolol in attenuating the systolic blood pressures changes.

요추 추간판 탈출증의 통증치료시 발견된 유골골종 -증례 보고-

노만석,강훈수,김정호,Ro, Man-Seog,Gang, Hoon-Soo,Kim, Jeong-Ho 대한통증학회 1997 The Korean Journal of Pain Vol.10 No.2

We experienced a case of osteoid osteoma in thoracic vertebra accompanied with herniated nucleus pulposus during the management of back pain. A 32 year old male patient with herniated nucleus pulposus complained of back pain and radiation to right leg. Lumbar epidural block with 1% mepivacaine 5 ml was performed for pain control and it relieved the radiating pain. However patient continued to experience severe exacerated back pain at night which responded to aspirin. Therefore we performed further examination for existence of disease of the spine and diagnosed osteoid osteoma in the right pedicle of T12 vertebra. In conclusion, we recommend physicians when evaluating patients with back pain to be congnizant of possible existence of neoplastic disease of the spine and incorporate it in differential diagnosis.

적조발생 조기경보 원격 레이저 형광 센서 개발

박영호,강훈수 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5

적조발생 조기경보 원격 레이저 형광 센서 개발

박영호,강훈수 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5

제왕절개술시 Propofol 또는 Thiopental-enflurane 마취에서 임산부의 각성와 상기

김정호,강훈수,장항 대한마취과학회 1997 Korean Journal of Anesthesiology Vol.33 No.4

Background : Experience of awareness and recall during general anesthesia would be most distressing for patients. Especially for the cesarean section, medical team must consider both maternal awareness and fetal safety. Authors tried to know the possibility of propofol use as induction and maintenance agent of anesthesia for the cesarean section in respect of maternal awareness, recall and fetal safety. Methods : Forty patients(ASA physical status 1, 2) were allocated randomly to either propofol(n=20)(P) or thiopental-enflurane(n=20)(T-E) group. We checked B.P, pulse rate, and the incidence of maternal awareness using the isolated forearm technique(IFT). The postoperative interview was conducted between 12∼24h after operation. Results : The incidence of maternal awareness signaled by flexing fingers in response to voice commands were significantly lower in the T-E group(20% after induction, no response during other times) than the P group(45% after induction, then 35%, 30%, after 5, 10 min delivery respectivly). Seven patients had postoperative recall of introspective awareness in the P group but no patients in the T-E group. The 1 min Apgar score of the newborn were significantly lower in the P group than the T-E group but both groups were within normal range. Conclusions : Our date indicated that, in comparison with thiopental-enflurane, propofol infusion (6 mg/kg/h) were associated with a greater incidence of awareness during surgery and recall. (Korean J Anesthesiol 1997; 33: 704∼710)

Size Dependence of the Photoluminescence Decay Time in Unstrained GaAs Quantum Dots

김종수,강훈수,변지수,정문석,임상엽,김준오,이상준,노삼규,김진수,임재영 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3

We report the size dependence of the photoluminescence (PL) decay time of unstrained GaAs quantum dot (QD) ensembles grown on an Al0.3Ga0.7As/GaAs (100) surface by using droplet epitaxy. The density of GaAs QDs is 3 × 109/cm2, which indicates that each QD is isolated from neighboring QDs. The low-temperature PL spectrum of the GaAs QD ensembles shows a Gausian profile with a linewidth broadening of 30 nm. The PL decay time of the GaAs QDs increases monotonically with increasing emission wavelength, which corresponds to the dot size. This result can be explained by a reduction in the exciton oscillator strength in larger dots. In addition, the PL decay time decreases with increasing excitation power. This can be explained by the state filling effect, which leads to an increase in electron-hole wave-function overlapping.

사지절단 수술시 신경초 차단에 의한 술후 지속적인 통증처지

김정호,박태인,강훈수,김영현,김지수 대한마취과학회 1993 Korean Journal of Anesthesiology Vol.26 No.5

A study of continuous postoperative regional analgesia by nerve sheath block for limb amputation is presented. The authors reviewed 65 patients with amputation at the level proximal to the wrist or ankle. 15 patients of which were managed with continuous postoperative regional analgesia (CPRA) by nerve sheath block. At the time of exposure of nerve trunk during amputation, a catheter was introduced directy into the transected nerve sheath through a seperated stab wound, then infuse 0.5% bupivacaine 5ml prior to wound closure and postoperatively at the rate of 2 ml/4~6 hours for 3~4 days. The results were as follows : 1) Effective amputation stump analgesia was obtained, significantly reducing the need for narcotic analgesics. 2) 46 (70%) patients experienced Phantom phenomena and 30 (46%) patients experienced Phantom pain, a less frequently in CPRA group. 3) Phantom pain was more commonly observed in patients with rnore severe preamputation pain. 4) There were no significant relationships between the occurence of Phantom pain and the age of amputee or the level of amputation. We concluded that continuous postoperative regional analgesia by nerve sheath block significantly reduced the narcotic requirements in patients with ampotation surgeries.

제왕절개술후 Morphine을 이용한 지속적 정맥내 통증조절시 Tenoxicam의 불완전한 선행진통 효과

김정호,노만석,강훈수,도건호 대한마취과학회 1997 Korean Journal of Anesthesiology Vol.33 No.6

Background : The analgesic properties of the nonsteroidal antiinflammatory drugs(NSAIDs) have been attributed to their effects on the peripheral synthesis of prostaglandins. Although the preoperative use of NSAIDs has been increasing because of concerns regarding the side effects of opioid analgesics but results of clinical preemptive analgesia studies remain inconclusive. So, we studied the efficacy of preemptive analgesic effects of tenoxicam, new NSAID, on postoperative continuous intravenous analgesia with morphine. Methods : We studied 40 parturients, undergoing cesarean section, ASA class I or II, randomly divided into two groups. Tenoxicam group were injected tenoxicam 0.3 mg/kg and control group were injected normal saline 3 ml at ten min. before induction. For both groups morphine 0.1 mg/kg was administered as loading dose and 0.015 mg/kg/hr as maintenance dose. We examined verbal quantitative score(VQS) at postoperative 30 min, 1, 6, 12, 24 and 48 hr. Maternal satisfaction, side effects, hepatic and renal function also evaluated after pain control. Results : The values of VQS showed no significant differences between two groups 30 min, 1 and 6hr after start of morphine infusion, but there was significant decrease in tenoxicam group compared to control group 12, 24 and 48 hr after start of morphine infusion(p<0.05). There was no significant difference in maternal satisfaction between two groups and also there were no significant differences in the overall incidences of side effects between two groups. Conclusions : Preoperative single injection of tenoxicam showed incomplete preemptive analgesic effects on postoperative pain control after cesarean section. (Korean J Anesthesiol 1997; 33: 1154∼1158)