Thrombus entrapped by patent foramen ovale in a patient with pulmonary embolism -a case report-

남상범,김찬미,조성아,정성찬,심연희 대한마취통증의학회 2015 Korean Journal of Anesthesiology Vol.68 No.1

Thrombus-in-transit appears to increase the risk of mortality compared to pulmonary embolism alone and can requirealteration in therapeutic plan. We present the case of a biatrial thromboembolus caught in transit across a patent foramenovale diagnosed by intraoperative transesophageal echocardiogram in a 69-year-old female with acute pulmonaryembolism and subsequent acute cerebral infarction. We suggest that echocardiography should be performed in a patientwith suspected pulmonary thromboembolism to evaluate right heart function and diagnose emboli in transit.

보호좌회전과 보호/비보호 겸용 좌회전 통행특성 차이를 고려한 보호/비보호 겸용 좌회전 적용방안에 관한 연구

남상범,김주현,신언교 한국ITS학회 2020 한국ITS학회논문지 Vol.19 No.4

기존 논문들처럼 지체시간 감소만으로 PPLT 특성을 반영하여 PPLT의 적용 여부를 판단하 는 것은 한계가 있다. 이에 본 논문에서는 지체시간 외에 통과 좌회전 교통량, 상충위험수를 사용하여 PPLT 적용방안을 제시하였다. 분석결과 좌회전 교통량이 용량 이상이면서 많을수록, 대향 직진 교통량은 용량 미만이면서 적을수록 PPLT 효과가 증가하였다. 그러나 좌회전 교통 량이 용량 미만에서는 선행 신호대기 차량들이 비보호로 교차로를 통과하게 되어 지체시간은 일부 감소하지만 전체 통과 좌회전 교통량은 증가하지 않고 상충위험률은 증가하게 된다. 그 리고 대향 직진 차로수가 1, 2차로에서는 상충위험수가 유사하지만 3차로 이상이 되면 크게 증가한다. 또한 PLT와 PPLT의 통과 좌회전 교통량 차이는 지체시간 차이와 유사한 패턴을 보 이면서 지체시간보다 PPLT 적용 범위가 더 넓고 상충위험수와 연관성이 높게 분석되었다. 따 라서 PPLT의 교통류 특성과 상충위험수 등을 고려하기 위해서는 통과 좌회전 교통량이 지체 시간보다 유리하다. 즉, PLT와 PPLT의 통과 좌회전 교통량, 지체시간 차이와 대향직진 3차로 이상에서의 상충위험수를 동시에 고려하여 PPLT 적용 여부를 판단하면 지체시간만을 적용해 온 기존 방안에 비해 합리적인 방안이 될 수 있을 것으로 판단된다. The application of PPLT is difficult to analyze and judge only from the effects of the delay time. In this study, the application of PPLT was proposed using not only the delay time of PLT and PPLT due to the change in traffic volume and the number of opposite straight lanes but also the traffic volume of passing a left turn and the number of conflict risks as indicators. According to the analysis, the more left-turn traffic than capacity and the less opposite-straight volume, the greater the PPLT effect. On the other hand, if the left-turn traffic is below capacity, the delay time will be reduced partially, but the overall passing left turn volume will not increase, and the conflict risk will increase. In addition, the conflict risk increases in the third lane or higher. Moreover, the difference of passing left-turn volume between PLT and PPLT showed a pattern similar to the delay time difference, and the PPLT coverage was wider than the difference in delay time and was associated more with the conflict risk numbers. Therefore, it would be reasonable to use passing left-turn traffic primarily, consider the delay time below the left-turn capacity, and consider the conflicting risk numbers simultaneously at or above the opposite straight three lanes.

요추 척추관 협착증 환자의 적외선 체열상

남상범,이호동,이윤우 대한체열학회 2003 대한체열진단학회지 Vol.3 No.1

Design of material removal rate to reduce machining time of dental crown

남상범,김병기 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7

Freeform surface grinding is one of the commonly used dental medical manufacturing processes. In dentistry machining, zirconia is one of main workpieces used for artificial teeth. Machining process for grinding of the ceramic usually takes a long time. In order to reduce this production time, it is critical to apply proper grinding parameters while maintaining high quality of machined artificial teeth. Required material removal rate (MRR) for workpiece can be used to determine the grinding parameters. However, it has been hard to find grinding parameters achieving a proper MRR of complex 3D models like as human teeth. In this study, MRR is predicted by using geometric data in the engagement region between machining bur and its workpiece while the MRR varies all along the tool path. Simulations of the machining time shows that the machining time can be reduced by adjusting the bur’s feed rate to maintain the predicted MRR.

The CobraPLATM During Anesthesia with Controlled Ventilation: A Clinical Trial of Efficacy

남상범,심연희,김민수,유영철,이윤우,한동우,이종석 연세대학교의과대학 2006 Yonsei medical journal Vol.47 No.6

The CobraPLATM (CPLA) is a relatively new supraglottic airway device that has not been sufficiently investigated. Here, we performed a prospective observational study to evaluate the efficacy of the CPLA during controlled ventilation. In 50 anesthetized and paralyzed patients undergoing elective surgery a CPLA was inserted and inflated to an intracuff pressure of 60 cm H2O. The success rate of insertion upon the first attempt was 82% (41/50), with a mean insertion time of 16.3 4.5 seconds. The adequacy of ventilation was assessed by observing the end tidal CO2 waveform, movement of the chest wall, peak airway pressure (13.5 cm H2O), and leak fraction (4%). We documented the airway sealing pressure (22.5 cm H2O) and noted that the the site of gas leaks at that pressure were either at the neck (52%), the abdomen (46%), or both (2%). In 44 (88%) patients, the vocal cords were visible in the fiberoptic view through the CPLA. There was no gastric insufflation during the anesthesia. Respiratory and hemodynamic parameters remained stable during CPLA insertion. Postoperative blood staining of CPLA was minimal, occurring in 22% (11/50) of patients. Mild and moderate throat soreness was reported in 44% (22/50) and 4% (2/50) of patients, respectively. Lastly, mild dysphonia was observed in 6% (3/50) of patients and mild dysphagia in 10% (5/50) of patients. Our results indicated that the CPLA is both easy to place and allows adequate ventilation during controlled ventilation.

판막대치술을 시행 받는 환자에서 체외순환 후 요골-대퇴동맥압간의 차이를 유발하는 인자들

남상범,곽영란,오영준,이종화,이정인,홍용우 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.42 No.6

신호시간을 고려한 PPLT 효율성에 관한 연구

남상범,김주현,신언교 대한교통학회 2018 대한교통학회지 Vol.36 No.5

Many studies which considered volume and lanes of opposite straight traffic have been carried out to improve left-turn traffic flow at the signalized intersection. However, there were no studies reflect signal intervals which much influenced on the efficiency of the left-turn traffic flow. For the purpose of effective left-turn treatment, we considered signal intervals of the opposite straight traffic and left-turn traffic as well as the volume and lanes of opposite straight traffic. Based on the simulation results, left-turn delay of reduced significantly by the application of protected/permissive left-turn (PPLT) in case of congested left-turn traffic illustrated as left-turn signal time of 10 or 20second, but not as much as congested left-turn traffic in case of uncongested left-turn traffic such as left-turn signal time of 30second. Therefore, it is concluded that the heavier the left-turn traffic congestion, the greater the effect of protected/permissive left-turn (PPLT) in terms of reducing delay. Simulation results according to the variation of cycle length as well as the volume and signal interval of left-turn and opposite straight traffic can be used to find the best left-turn treatment among protected left-turn (PRLT), permissive left-turn (PELT) and protected/permissive left-turn (PPLT) at a signalized intersection. 지금까지 신호교차로의 좌회전 운영 효율성 향상을 위한 많은 연구가 수행되어 왔다. 하지만 대향 직진 차로수와 교통량만을 고려한 분석으로 교차로의 운영 효율성을 판단했다. 신호교차로의 효율성 판단 시 신호시간이 중요한 변수임에도 불구하고 이를 고려하여 체계적으로 분석한 연구는 없었다. 이에 본 연구에서는 대향 직진 신호시간, 좌회전 신호시간 등의 신호 조건을 포함시켜 좌회전 처리방안(PRLT, PELT, PPLT)을 분석했다. 또한 조건 변화에 따른 상호관계를 고려하여 교차로에서의 효율적인 좌회전 처리방안을 제시하였다. 분석 결과 좌회전 신호시간이 10, 20초로 짧아서 혼잡한 경우는 PPLT 적용 후 PRLT보다 좌회전 지체시간이 크게 감소하였다. 반면에 좌회전이 혼잡하지 않은 30초의 경우는 PPLT 도입 효과가 크지 않은 것으로 분석되었다. 따라서 좌회전 혼잡이 큰 교차로일수록 PPLT 도입 필요성이 높으며 도입 효과도 클 것으로 판단된다. 차로별 대향직진 교통량과 좌회전 교통량, 신호시간(대향직진 신호시간과 좌회전 신호시간 및 신호주기) 등을 조사하여 시뮬레이션 결과에 적용하면 효율적인 좌회전 처리방식인 PPLT와 신호시간 운영계획 수립에 활용될 수 있다.

광간섭계 시스템의 파장과 측정 거리 최적화를 통한 정밀 진동 측정

남상범(S. B. Nam),김종원(J. Kim),김병기(B. Kim) Korean Society for Precision Engineering 2018 한국정밀공학회 학술발표대회 논문집 Vol.2018 No.10월

신호시간을 고려한 PPLT 효율성에 관한 연구

남상범(NAM, Sangbum),김주현(KIM, Ju Hyun),신언교(SHIN, Eon Kyo) 대한교통학회 2018 대한교통학회지 Vol.- No.-

지금까지 신호교차로의 좌회전 운영 효율성 향상을 위한 많은 연구가 수행되어 왔다. 하지만 대향 직진 차로수와 교통량만을 고려한 분석으로 교차로의 운영 효율성을 판단했다. 신호교차로의 효율성 판단 시 신호시간이 중요한 변수임에도 불구하고 이를 고려하여 체계적으로 분석한 연구는 없었다. 이에 본 연구에서는 대향 직진 신호시간, 좌회전 신호시간 등의 신호 조건을 포함시켜 좌회전 처리방안(PRLT, PELT, PPLT)을 분석했다. 또한 조건 변화에 따른 상호관계를 고려하여 교차로에서의 효율적인 좌회전 처리방안을 제시하였다. 분석 결과 좌회전 신호시간이 10, 20초로 짧아서 혼잡한 경우는 PPLT 적용 후 PRLT보다 좌회전 지체시간이 크게 감소하였다. 반면에 좌회전이 혼잡하지 않은 30초의 경우는 PPLT 도입 효과가 크지 않은 것으로 분석되었다. 따라서 좌회전 혼잡이 큰 교차로일수록 PPLT 도입 필요성이 높으며 도입 효과도 클 것으로 판단된다. 차로별 대향직진 교통량과 좌회전 교통량, 신호시간(대향직진 신호시간, 좌회전 신호시간, 신호주기) 등을 조사하여 시뮬레이션 결과에 적용하면 효율적인 좌회전 처리방식인 PPLT와 신호시간 운영계획 수립에 활용될 수 있다. Many studies which considered volume and lanes of opposite straight traffic have been carried out to improve left-turn traffic flow at the signalized intersection. However, there were no studies reflect signal intervals which much influenced on the efficiency of the left-turn traffic flow. For the purpose of effective left-turn treatment, we considered signal intervals of the opposite straight traffic and left-turn traffic as well as the volume and lanes of opposite straight traffic. Based on the simulation results, left-turn delay of reduced significantly by the application of protected/permissive left-turn (PPLT) in case of congested left-turn traffic illustrated as left-turn signal time of 10 or 20second, but not as much as congested left-turn traffic in case of uncongested left-turn traffic such as left-turn signal time of 30second. Therefore, it is concluded that the heavier the left-turn traffic congestion, the greater the effect of protected/permissive left-turn (PPLT) in terms of reducing delay. Simulation results according to the variation of cycle length as well as the volume and signal interval of left-turn and opposite straight traffic can be used to find the best left-turn treatment among protected left-turn (PRLT), permissive left-turn (PELT) and protected/permissive left-turn (PPLT) at a signalized intersection.

성상신경절 차단의 돌발성 난청에 대한 효과

남상범(Sang Beom Nam),윤덕미(Duck Mi Yoon),이윤우( 대한통증학회 1998 The Korean Journal of Pain Vol.11 No.1

N/A Background: Idiopathic sudden sensorineural hearing loss(ISSHL) has been generally defined as an abrupt loss of auditory acuity without precipitating factors. Since ISSHL was first described as a disease entity, numerous reports assessing a variety of treatment regimens have been published. But its etiology, pathogenesis, treatment, and prognosis are controversial at the present time. Stellate ganglion block(SGB) has been used for the treatment of ISSHL by vasodilatation and increased blood flow to the inner ear. Methods: We reviewed the records of 152 patients to investigate the efficacy of SGB for ISSHL. the control group was managed with medications such as hypaque, heparin, steroid, nicotinic acid, and vitamins. The SGB group was managed with SGB and the same medications. SGB was performed with 8 ml of 1.0% mepivacaine. The efficacy of treatment was evaluated by pure-tone average following therapy. The recovery of hearing was defined as Siegels criteria I, II, or III. Results: The recovery rate of the SGB group was higher than that of the control group(61.5 vs. 42.9%, p<0.05). The recovery rate was higher in patients who were treated early, within 7 days from the onset of symptoms, especially in the SGB group(79.7%). And in the case that initial hearing loss was severe (>70dB), the SGB group had a higher recovery rate(64.2%) than the control group(42.5%). Conclusions: SGB is thought to be a useful therapy for ISSHL, especially in the patients who were treated soon after onset or whose initial hearing loss was severe.