정전기 현상의 안전에 관한 고찰

박한석 釜山工業大學校 1986 論文集 Vol.28 No.2

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.

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.

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.

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.

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)

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)

복강경 담낭절제술 시 후두 마스크를 통한 양압 환기의 효능과 안전성

박한석,정찬종,김형호,진영준,김도윤 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.42 No.1

Background : We evaluated the efficacy and safety of positive pressure ventilation (PPV) with a laryngeal mask airway (LMA), compared with an endotracheal tube (ETT) during a laparoscopic cholecystectomy. Methods : Sixty six, ASA Ⅰ-Ⅱ adults scheduled for an elective laparoscopic cholecystectomy were randomly assigned to LMA or ETT. Anesthesia was induced with fentanyl 2 ㎍/㎏, lidocaine 0.5 ㎎/㎏/ and propofol 2 ㎎/㎏ and maintained with a continuous infusion of propofol 6-12 ㎎/㎏/h in 67% N_2O, atracurium and fentanyl. An ETT or LMA was placed with atracurium 0.5 ㎎/㎏. Respiratory and hemodynamic parameters were measured before and after intraabdominal CO_2 insufflation. The surgeon assessed the degree of change in gastric distension under laparoscope. Results : Oxygen saturation, end-tidal CO_2, peak inspiratory pressure, expiratory tidal volume and compliance of the respiratory system didn't differ between both groups. Blood pressure and heart rate were lower in the LMA group than in the ETT group only at 5 min after induction (P < 0.05). The maintenance dose of propofol, fentanyl and atracurium were similar in both groups. Degree of change in gastric distension were similar in both groups. The LMA resulted in less coughing after removal than did the ETT (P <0.05). Conclusions : PPV with LMA permits adequate pulmonary ventilation and hemodynamic stability during laparoscopic cholecystectomy. Gastric distension occurs with similar frequency in LMA or ETT. (Korean J Anesthesiol 2002; 42: 43~49)

Descrbing Function Method 에 의한 진동하는 송전선의 이격거리에 관한 연구

박한석 부산공업대학교(부산공업전문대학) 1991 論文集 Vol.33 No.-

TiO₂ 광전극 두께와 두 기판 간격에 따른 DSSC의 효율 특성

박한석,권성열,양욱,Park, Han-Seok,Kwon, Sung-Yeol,Yang, Wook 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.7

DSSCs efficiency by thickness of $TiO_2$ photoelectrode and thickness differences between two substrates studied. DSSCs is made of the doctor blade method and photoelectrode annealing temperature elevated in a different ways. In addition, cells efficiencies of according to the different thickness between $TiO_2$ photoelectrode substrate and Pt counter electrode was measured. Efficiency of DSSCs made with $TiO_2$ photoelectrode of 18 ${\mu}m$ thickness and the gap difference between the substrate 28 ${\mu}m$ shows a highest 4.805% efficiency.