정전기 현상의 안전에 관한 고찰

박한석 釜山工業大學校 1986 論文集 Vol.28 No.2

μ-processor에 의한 他勵直流電動機의 點弧回路設計

朴翰錫 釜山工業大學 1987 論文集 Vol.29 No.-

A firing scheme based on a ?-processor to control a single-phase thyristor converter is presented. Using look-up table asgorithm to take real-time control, it gives a full range control of the firing angle between 0°and 180°. Together with the control algorithm for program in ?-processor, the correct firing output signals can be founded. For a design of firing circuit, the thyristor is siolated by using photocupler between ?-processor controller and firing circuit.

소 수술시 Propofol, Ketamine, Fentanyl, Ketorolac 을 이용한 Monitored Anesthetic Care(MAC)

박한석,정찬종,진영준 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.39 No.5

Background : Even when patients agree that anesthesia is indispensable for a safe and comfortable operation, they are reluctant to experience the side effects of conventional general and regional anesthesia. We investigated whether monitored anesthetic care (MAC) using propofol, ketamine, fentanyl, and ketolorac can be substituted for conventional anesthesia in minor surgery. Methods : One hundred forty six healthy adult patients who received minor surgery were studied. All were fasted, premedicated, and monitored according to conventional general anesthesia. Fentanyl 2 pgfkg, propofol 1 mg/kg, ketamine 0.2 mg/kg, and ketorolac 30 mg were given intravenously and propofol was maintained at 3 4 mg/kg/h. Before local anesthetics infiltration at the incision site, ketamine 5 mg and propofol 20 mg were added intravenously. During the procedure, fentanyl 25㎍ plus propofol 20 mg were added whenever involuntary movements appeared. We observed vital signs, complications, time to eye opening to verbal command, time o regain orientation, satisfaction with anesthesia, postoperative pain scores, and analgesic consumption. Results: Blood pressure and heart rate were reduced at the beginning of anesthesia, but were not clinically significant. Intraoperatively, respiratory depression (40.4%), SpO_2 $lt; 90% (25.3%) were observed, but no patients needed tracheal intubation. Postoperatively, dizziness (29.5%), pain (20.5%), and nausea (15.8%), were observed. The time to eye opening and to regaining of orientation were 57.3±119.4 sec, and 8.0±4.7 min respectively. Satisfaction with anesthesia was remarkable; surgeon (76.7%), patients (91.8%). Postoperative pain scores were low; 59.6% of patients did not need analgesics for the first 24 h. Conclusions: If careful monitoning and instantaneous management for respiratory depression by anesthesiologist is provided, MAC using PKFK is an excellent and readily applicable method for minor surgery. (Korean J Anesthesiol 2000; 39: 619-625)

정상안압녹내장에서 브린졸라미드 1%와 티몰롤 0.5% 혼합제제의 효과

박한석,최철영,배정훈,김준모,Han Seok Park,Chul Young Choi,Jeong Hun Bae,Joon Mo Kim 대한안과학회 2014 대한안과학회지 Vol.55 No.7

<b>Purpose:</b> We conducted a study to evaluate the effects of brinzolamide/timolol fixed combination (BTFC) in normal-tension glaucoma (NTG) patients. <b>Methods:</b> We reviewed the records of 33 normal-tension glaucoma patients treated with BTFC in the unilateral eye. We measured intraocular pressure (IOP) every 2 and 1/2 hours between 09:00 am and 04:30 pm. After using BTFC at 8:00 am and 8:00 pm for 6 months, we measured the IOP at the same time period. We analyzed and compared the IOP of eyes treated with BTFC and contralateral eyes. <b>Results:</b> The mean reduction in IOP was -2.85 ± 1.43 mm Hg (-18.36 ± 8.58%) in the eyes treated with BTFC and -2.21 ± 1.73 mm Hg (-13.90 ± 10.66%) in the contralateral eyes. The IOP lowering effect was greater in the eyes treated with BTFC than in the contralateral eyes. After 6 months of BTFC instillation, the changes in IOP measurements were the lowest at 11:30 am and increased at each time point afterwards. The greatest reduction in IOP was observed at 1 month; however, significant IOP reduction was observed at 3 and 6 months in both BTFC and contralateral eyes. There was no serious adverse event causing ocular damage. <b>Conclusions:</b> BTFC provided a significant IOP reduction in both BTFC and contralateral eyes in NTG patients. J Korean Ophthalmol Soc 2014;55(7):1056-1063

경막외 Morphine 투여 후 Droperidol, Granisetron, Propofol의 항 오심, 구토 효과 비교

박한석,정찬종,진영준 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.43 No.6

Background: We compared the antiemetic efficacy of droperiodol, granisetron, and propofol in post-operative nausea and vomiting (PONV) in the patients who received epidural anesthesia with bupivacaine and morphine. Methods: Among one hundred and sixty one ASA physical status Ⅰ or Ⅱ patients who received an abdominal hysterectomy under epidural anesthesia, sixty patients who showed PONV and thereby received antiemetics were randomly assigned into 3 groups: droperidol 0.75 mg (droperidol group: n=20), granisetron 1.0 mg (granisetron group: n=20) or propofol 20 mg (propofol group: n=20) by an intravenous injection. Antiemetics were injected according to the patient request up to 3 times of initial does. Nausea, vomiting, sedation, anxiety, and discomfort were assessed and the time interval between each antiemetic administration was recorded by a blind observer for 30 min after the injection of antiemetics. Results: Success rates in PONV control for 30 min after the 1st antiemetic administration were 90%, 95%, and 85% in the droperidol, granisetron, and propofol group, respectively. The propofol group experienced a higher relapse incidence (90%) than other groups (droperidol: 35%, granisetron: 25%) (P<0.05). The granisetron group showed a longer time interval between the 1st and 2nd antiemetic administration (616±501 min: P<0.05) than other groups. No patients in the granisetron and propofol groups showed any anxiety and discomfort, however six patients in the droperiodl group showed some anxiety and discomfort. Conclusions: All antiemetics were effective to control the PONV, but droperidol caused some anxiety and discomfort and propofol showed higher relapse incidence. (Korean J Anesthesiol 2002; 43: 704~709)

Sliding Mode 制御法에 의한 位置 Servo system에 관한 硏究

朴瀚錫 釜山工業大學校 1988 論文集 Vol.30 No.-

Sliding mode control is an effective means to keep a system insensitive to panametric variations and disturbances, in the conventional sliding mode control applied to position servo systems, the sliding mode regime is restricted near the origin, and therefore, insensitivity cannot be ensured throughout an entrie response. This paper presents a new method in which a sliding curve is used instead of straight line. The sliding curve is difined in such a way that in generalthe system responds following a max acceleration curve, then a max speed curve, and finally a max deceleration.

Descrbing Function Method에 의한 진동하는 송전선의 이격거리에 관한 연구

박한석 釜山工業大學校 1991 論文集 Vol.33 No.-

Estimates of maximum amplitudes of conductor galloping are needed in order to determine appropriate phase-to-phase clearances on overhead power lines. A new method for computing these estimates is obtained by the use of mathematical models of conductor golloping that include both vertical and torsional motion, The method gives estimates of the maximum galloping amplitude and frequency for a wind speed. Computer simulations show good agreement with the maximum amplitude and frequency estimates predicted by the model. The maximum galloping amplitudes predicted by the model also conform well with those observed on actual galloping lines. In addition, this analysis verifies what a number of galloping conductor researchers had long expected, namely that torsional conductor motion limits maximum galloping amplitudes.

靜電氣現象의 安全에 關한 考察

朴瀚錫 釜山工業大學校 1986 論文集 Vol.28 No.2

Recently, speed up and a large scale of work-process generates great quantities of elec-trostatic so that fire, explosion and electric shock is increased. Therefore, theory and various preventions of complicated electrostatic is dealt with the important issue in this paper.

전압형 풀 브리지 ZVS PWM 고주파 공진형 인버터의 특성

박한석,이상무,정상석,문상필,우경일 대한전기학회 2019 전기학회논문지 P Vol.68 No.4

In this paper, we propose a new high frequency PWM inverter that converts AC power of 110[V] system or 220[V] system into DC to convert it into high frequency AC by using a new high frequency inverter power system. The proposed voltage-type full-bridge ZVS-PWM high-frequency inverter has shown that power control can be applied to the phase change. The phase shift control method is characterized in that the current penetration depth of the induction heating sub-system can be always kept constant because the power can be controlled at a constant frequency, and the conductivity and EMI noise level are not dispersed. From the above results, it is confirmed that it is effective to improve the efficiency of the proposed high frequency PWM inverter system.

고식적 복강신경총 차단법과 경대동맥 차단법의 증례보고

박한석,김승수,진영준,채기영 대한마취과학회 1994 Korean Journal of Anesthesiology Vol.27 No.3

To relieve intractable upper abdominal cancer pain using 75% alcohol, Celiac Plexus Blocks (C.P.B.) were performed by means of the classic two needle technique in 7 cases and by single needle transaortic method in 3 cases under fluroscopic guidance. Both methods relieved the pain effectively and there was no significant hemorragic, neurologic and other complications. The degree of pain relief estimated by Graphic Rating Scale (GRS) and the incidence of complication were similar between two methods but the single needle transaortic method was more simple, easier and effective with just one third of alcohol used in the classic method.