중앙심벽형 필댐의 칠투량 및 침하량에 관한 연구 : 임하댐을 중심으로

이규탁(Lee Kyu Tak),임희대(Lim Heui Dae) 대한토목학회 2007 대한토목학회논문집 C Vol.27 No.6

본 논문은 중앙심벽형 필댐인 임하댐을 대상으로 침투량과 정상부 침하량의 거동특성을 파악하여 댐의 안전관리에 활용하기 위한 연구이다. 유한요소법에 의한 침투류해석과 응력-변형률 해석을 실시하여 계측자료와 비교분석 하였다. 침투류의 파이핑에 대한 안전성은 한계침투량을 구하여 계측된 누수량과 비교한 결과 안전함을 확인하였고, 누수량 계측체계의 취약점이 분석되어 개선방향을 제안하였다. 각 수위에서 계측된 최대누수량을 기준으로 회귀분석을 실시하여 상관식을 유도하였으며, 이 식에 일정한 신뢰수준을 부여하여 누수량 관리기법을 제시하였다. 정상부 침하율은 0.3%로 댐설계기준에서 정하고 있는 축조높이의 1% 더쌓기 기준내에서 안정적으로 거동하고 있음을 확인하였다. 국내 5개 중앙심벽형 필댐의 정상부 침하량 자료 분석을 통하여 운영기간(T)별 축조높이(H)에 따른 침하량 예측식을 제안하였고, 댐의 운영중 정상부 침하량의 안전구역을 설정하여 제시하였다. The purpose of this study is to utilize the behavioral characteristics of the seepage and the crest settlement of Imha Dam, a central cored rockfill dam in Korea, after identifying the characteristics for the safety management of the dam. The study compares the findings gathered by finite element analysis of seepage and stress-deformation with measured data. The safety of piping to the filtration flow is confirmed as a result of comparing calculated critical seepage with the measured rate of leakage. Also, the study proposes directions to improve the weakness in the leakage measurement system. Through regression analysis, using the maximum leakage measured in each water level, a correlation equation was derived. By giving a fixed level of reliability to this equation, a leakage management technique was suggested. The results show that the crest settlement was 0.30% and behaved in a stable manner within the scope of the guidelines for camber of 1% to the embankment height specified in the dam design standard. The study proposes a settlement rate formula consisting of the height of the dam (H) and the operation term (T) through data analysis of the crest settlement with 5 central cored rockfill dams in Korea, and the safety zone is proposed considering the crest settlement for each operating period.

RFID와 안드로이드 플랫폼을 이용한 물류센터 창고관리 어플리케이션

김재수(Jae-Soo Kim),이규탁(Kyu-Tak Lee),남시명(Si-Myung Nam) 한국컴퓨터정보학회 2015 한국컴퓨터정보학회 학술발표논문집 Vol.23 No.1

척추수술환자에서 급성 동량성 혈액희석 및 유도저혈압을 병용한 마취관리

이규탁,민진혜,정창우 관동대학교 의과학연구소 2000 關東醫大學術誌 Vol.4 No.1

Due to the discovery that blood transfusion can evoked several side effects, there has been increased interest in technologies that reduce the amount of homologous blood used during and after surgery. Acute normovolemic hemodilution is known as a convinient and effective blood conservation method, and drug-induced hypotension can reduce the amount of intraoperative bleeding with better operative field. Combination of these two techniques was suggested to reduce homologous blood requirements in various surgeries. Therefore, to minimize homologous blood transfusion, we conducted general anesthesia using acute normovolemic hemodilution combined with induced hypotension in patient undergoing spinal fusion surgery. We think that the routine careful combination of these techniques can be carried out safely in many surgeries.

응급개복술을 위한 전신마취도중 발견한 기관식도루 경험

이규탁,이윤석,정춘근,채영근 대한마취과학회 1997 Korean Journal of Anesthesiology Vol.33 No.5

Tracheoesophageal fistula(TEF) occurs in approximately 1 in 3,000 to 5,000 live births. TEF arises from failure of normal division of proximal foregut into separate respiratory and digestive tracts at 4 weeks' gestation. TEF and esophageal atresia are interrelated anomalies, and TEF usually occurs with esophageal atresia. These are usually diagnosed shortly after birth. However, the diagnosis is often delayed in TEF without esophageal atresia, because babies with this anomaly are usually normal in size and seldom have other anomalies. Therefore, sometimes TEF without esophageal atresia is found during operation for an unrelated condition when positive pressure ventilation causes massive inflation of the gastrointestinal tract. We report a case of TEF in adult patient found during general anesthesia for emergency exploratory laparotomy. (Korean J Anesthesiol 1997; 33: 993∼996)

경요도 전립선절제술에 사용한 척추-경막외 병용마취

이규탁,정춘근 대한마취과학회 1998 Korean Journal of Anesthesiology Vol.35 No.3

Background : The technique of combined spinal-epidural anesthesia(CSE) may offer theoretic advantages for the various surgeries, because it produces the rapid onset of spinal anesthesia, with the option to extend the blockade and postoperative pain control with an epidural catheter. In this study, we attempt to evaluate both advantages and disadvantages of the CSE for transurethral resection of the prostate(TURP). Methods : Fifteen patients scheduled to undergo TURP were involved in our study. In all patients, a 17 G Tuohy needle was introduced into the epidural space at L3-4 or L4-5 interspace. Using the needle-through-needle technique, each patients received a subarachnoid injection of 8 mg hyperbaric bupivacaine through a 25 G Whitacre needle. After withdrawal of the Whitacre needle, an epidural catheter was inserted into the epidural space. The level of sensory blockade was checked by pinprick test every 1-2 minute for 30 minutes. Epidural postoperative pain control was done after operation. Postoperatively, we evaluated the adverse effects and the quality of postoperative pain control. Results : The time from start of anesthesia to the time for a T10 sensory block and the time to start of surgery were 6±2 min and 21±3 min, respectively. At 5, 10, 15 and 20 minutes after spinal anesthesia, sensory blockade level was T10±1, T7±2, T6±2, and T5±1, respectively. In general, the quality of anesthesia was good, and most of the patients were satisfied with postoperative pain control. Conclusions : CSE provided reliable anesthesia and excellent postoperative analgesia for TURP. (Korean J Anesthesiol 1998; 35: 473-478)

경유돌공 부위에서 전기신경자극기를 이용한 안면경련 환자의 치료

정창우,민진혜,이규탁 관동대학교 의과학연구소 2000 關東醫大學術誌 Vol.4 No.1

Facial spasm is the most common in middle aged women, which is a distressing condition characterized by involuntary, intermittent, unilateral twitching of the muscles innervated by the facial nerve. There are various treatments for facial spam, such as neurovascular decompression, local injection of botulinum, facial nerve compression at stylomastoid foramen and facial nerve block with O'Brien method. There are the same clinical problems associated with the reported procedure in pain clinic, such as severe pain and recurrence of spasm. In this paper, we report the modified facial nerve block using electric nerve stimulator at the stylomastoid foramen. This new technique will be able to reduce the pain and the discomfort during facial nerve block, and reduced the recurrence of facial spasm.

부인과 수술후 Morphine 을 이용한 정맥내 자가통증조절법에서 Ketorolac 의 적정 혼합 용량

이상철,서광석,이규탁,임영진,도상환,노영진,오아영,노지윤 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.39 No.5

Background : The aim of this study was to determine an intravenous dose of ketorolac providing augmentation of analgesia and lowering adverse events for patients using postoperative intravenous patient-controlled analgesia (IV-PCA) with morphine. Methods : One hundred and ninety eight patients who underwent an elective gynecologic operation were allocated to one of seven groups (ketorolac 180 mg K6, ketorolac 150 mg+morphine 10 mg K5Ml, ketorolac 120 mg + morphine 20 mg K4M2, ketorolac 90 mg + morphine 30 mg K3M3, ketorolac 60 mg + morphine 40 mg K2M4, ketorolac 30 mg + morphine 50 mg K1M5, morphine 60 mg M6). After a loading dose of 3 ml, the PCA was started at a setting of 1 ml per demand, with a 8 minute lockout interval and 5-h limit. Results : The total PCA volume was lower in the K3M3, K2M4 and M6 groups. Visual analogue scale pain scores were higher in the K6 and M6 groups. More additional analgesics were required in the K6, KSMl, KlM5 and M6 groups. More antiemetics were required in the M6 group, although the incidence of nausea/vomiting and pruritus was similar among the groups. The sedation scores were lower in the K6 group and higher in the M6 group, 6h postoperatively; and higher in the M6 and K1M5 groups, 24 h postoperatively. Conclusions : The combination of morphine 30 mg and ketorolac 90 mg, or morphine 40 mg and ketorolac 60 mg in IV-PCA with a total volume of 60 ml, is more effective in analgesia and has less adverse events. (Korean J Anesthesiol 2000; 39: 700-705)

고혈압환자에서 Diltiazem이 기관내튜브 발관시 평균동맥압 및 심박수에 미치는 영향

김혜경,이규탁,이윤석,정춘근 대한마취과학회 1998 Korean Journal of Anesthesiology Vol.35 No.2

Background : Tracheal extubation provokes hypertension and tachycardia, as does tracheal intubation. Especially hypertensive patients are more likely to exhibit substantial fluctuations in hemodynamics and myocardial ischemia than normotensive patients during these stressful periods. The aim of present study was to evaluate the effects of intravenous diltiazem in attenuating mean arterial pressure(MAP) and heart rate(HR) responses to tracheal extubation in hypertensive patients. Methods : Thirty-seven hypertensive patients who were to undergo elective surgery were randomly assigned to one of three groups : saline (control), lidocaine 1 mg/kg, and diltiazem 0.2 mg/kg. These drugs were given 2 minutes prior to tracheal extubation. Anesthesia was induced by the injection of fentanyl 1.5 g/kg, thiopental 5 mg/kg, and vecuronium 0.1 mg/kg and maintained with 50% N2O in O2 and 1∼2 vol.% enflurane. Changes in HR and MAP were measured during and after tracheal extubation. Results : In the diltiazem group, the MAP ecreased significantly at drug administration, extubation, and post-extubation 1 min. However there were no significant differences in HR among 3 groups. Conclusions : These data suggest that intravenous injection of diltiazem 0.2 mg/kg given 2 minutes before tracheal extubation was effective in attenuating MAP changes associated with tracheal extubation. But HR changes were not different significantly among 3 groups. Further studies are required for the effective prophylaxis against tachycardia associated with tracheal extubation. (Korean J Anesthesiol 1998; 35: 300∼305)

슬관절 전치환술에서 수혈 양상에 관한 분석

김혜경,이규탁,도상환 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.37 No.3

Background : Almost all of the blood loss occurring postoperatively in total knee arthroplasty (TKA) is due to the use of an intraoperative tourniquet in all cases. So we tried having blood transfusions done, not by anesthesiologists intraoperatively but by orthopedic surgeons postoperatively. The purpose of this study is to analyze postoperative blood loss and transfusion practice in TKAs. Methods : We analyzed retrospectively the medical records of 64 TKAs in 40 patients between March, 1997 and February, 1999. Results : Six male and fifty-eight female patients were enrolled. Their mean preoperative, immediate postoperative, and post-transfusion hematocrit were 37.1± 3.4, 34.4± 3.3, and 34.4±3.9, respectively. The preoperative and post-transfusion hematocrit were measured in all cases, but immediate postoperative hematocrit was measured in only 21 cases, and the hematocrit of 17 among the 21 cases was over 32 percent. Drainage amount, for the 1st postoperative day were 843 328 ml, and the total drainaamount was 993±362 ml. The blood transfusion amount was 2.6±0.9 units. There were no statistically significant differences in preoperative hematocrit, immediate postoperative hematocrit, postoperative drainage amount and postoperative transfusion amount between the general and regional anesthetic group; Preoperative hematocrit did not statistically affect the postoperative transfusion amount, but the postoperative drainage amount was statistically associated with an increased postoperative transfusion amount. Conclusions : Based on these results, it was concluded that postoperative blood transfusion in TKA was to be done on the basis of clinical impressions of orthopedic surgeons in which postoperative drainage amount was the most important consideration. Therefore, postoperative transfusion should be based on appropriate transfusion guidelines and a careful clinical examination of the patient. (Korean J Anesthesiol 1999; 37: 402∼405)

부인과 수술환자에서 정맥내 자가통증조절법의 기저 주입 유무에 따른 비교

김종수,김진태,이규탁,임영진,도상환 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.38 No.4

Backgroand : Intravenous patient-confrolled analgesia (IV-FCA) is widely used because it is a simple, safe, and effective method for postoperative pain control. Conoversies exist over the use of a continuous basal infusion in IV-PCA regarding its effectiveness. We evaluated the analgesic efficacy and side effects of PCA with basal infusion after gynecologic surgery and compared these results with PCA alone. Method : Eighty women undergoing elective gynecologic surgery under general anesthesia were studied. These patients were randomly assigned to receive either PCA alone (group 1) or PCA with basal infusion (group 2). Analgesic consumption, visual analogue scale (VAS) pain score, and side effects were assessed at postoperative 6 hours and 24 hours. Results : In group 1, the amounts of analgesic used during the postoperative 6 hours and 24 hours were 15 ± 5 and 30 ± 13 ml, the median VAS pain score at postoperative 6 hours and 24 hours were 50 and 35 respectively. In group 2, the amounts of analgesic us during the postoperative 6 hours and 24 hours were 19 ± 7 and 43 ± 1 ml, the mediam VAS pain score at postopetative 6 hours and 24 hours were 50 and 38 respectively. The analgesic consumption during the postoperative 6 hours and 24 hours was significantly higher in group 2 than in group 1. There was no significant difference in median VAS pain score between the groups. There were no significant differences in incidence of side effects between groups. Conclusions : The use of a PCA with basal infusion appears to offer no clinical advantage over PCA alone. (Koream J Anesthesiol 2000; 38: 6S1~656)