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임재관,김정대,성백경,최준호,소광섭 한국물리학회 2003 새물리 Vol.47 No.2
The time--dependence of th delayed-luminescence (DL) from Euonymus Japonica leaves was studied and the DL exhibited a hyperbolic decay function, which is the signature of coherence of biophotons from plant leaves. The exponent $\beta$ of the hyperbolic function is the characteristic feature of plant species. We investigated the temperature dependency of the $\beta$--value and found that $\beta$ decreased with rising temperature as (Tc - T), where Tc = 51.3 $\pm$ 0.3 $^\circ$C. The value of $\alpha$ was 0.41 $\pm$ 0.07, DL phenomenon ceased at 52 $^\circ$C. 사철나뭇잎 (학명: {\it Euonymus Japonica})에서 나오는 지연발광 (Delayed Luminescence)의 시간적 특성을 조사하였다. 나뭇잎과 같은 생물체에서 방출되는 광자의 결맞음으로 지연발광의 시간변화는 쌍곡선 함수에 따름이 알려져 있다. 특히 쌍곡선 함수의 지수 $\beta$는 그 생물체의 특성으로 간주할 수 있다. 우리는 $\beta$값의 온도의존도를 조사하고, 그 변화가 특성함수 $(T_c-T)^{\alpha}$에 따름을 발견하였다. 여기서 $T_c = 51.3\pm 0.3^{\circ}$C 이고 $\alpha = 0.41\pm 0.07$ 이며, 52 $^{\circ}$C 의 처리온도에서 지연발광현상이 소멸되었다.
임재관,김성민 대한척추신경외과학회 2013 Neurospine Vol.10 No.2
Objective: To evaluate the radiographic results of minimally invasive (MIS) anterior lumbar interbody fusion (ALIF) and transforaminal lumbar interbody fusion (TLIF). Methods: Twelve and nineteen patients who underwent MIS-ALIF, MIS-TLIF, respectively, from 2006 to 2008 were analyzed with a minimum 24-months’ follow-up. Additionally, 18 patients treated with single level open TLIF surgery in 2007 were evaluated as a comparative group. X-rays and CT images were evaluated preoperatively, postoperatively, and at the final follow-up. Fusion and subsidence rates were determined, and radiographic parameters, including lumbar lordosis angle (LLA), fused segment angle (FSA), sacral slope angle (SSA), disc height (DH), and foraminal height (FH), were analyzed. These parameters were also compared between the open and MIS-TLIF groups. Results: In the MIS interbody fusion group, statistically significant increases were observed in LLA, FSA, and DH and FH between preoperative and final values. The changes in LLA, FSA, and DH were significantly increased in the MIS-ALIF group compared with the MIS-TLIF group, but SSA and FH were not significantly different. No significant differences were seen between open and MIS-TLIF except for DH. The interbody subsidence and fusion rates of the MIS groups were 12.0±4% and 96%, respectively. Conclusion: Radiographic results of MIS interbody fusion surgery are as favorable as those with conventional surgery regarding fusion, restoration of disc height, foraminal height, and lumbar lordosis. MIS-ALIF is more effective than MIS-TLIF for intervertebral disc height restoration and lumbar lordosis.
임재관,원종윤,안치범,김지언,김희정,정재승 대한흉부외과학회 2021 Journal of Chest Surgery (J Chest Surg) Vol.54 No.2
Background: Artificial grafts such as polyethylene terephthalate (Dacron) and expanded polytetrafluoroethylene (ePTFE) are used for various cardiovascular surgical procedures. The compliance properties of prosthetic grafts could affect hemodynamic energy, which can be measured using the energy-equivalent pressure (EEP) and surplus hemodynamic energy (SHE). We investigated changes in the hemodynamic energy of prosthetic grafts. Methods: In a simulation test, the changes in EEP for these grafts were estimated using COMSOL MULTIPHYSICS. The Young modulus, Poisson ratio, and density were used to an- alyze the grafts’ material properties, and pre- and post-graft EEP values were obtained by computing the product of the pressure and velocity. In an in vivo study, Dacron and ePTFE grafts were anastomosed in an end-to-side fashion on the descending thoracic aorta of swine. The pulsatile pump flow was fixed at 2 L/min. Real-time flow and pressure were measured at the distal part of each graft, while clamping the other graft and the descend- ing thoracic aorta. EEP and SHE were calculated and compared. Results: In the simulation test, the mean arterial pressure decreased by 39% for all sim- ulations. EEP decreased by 42% for both grafts, and by around 55% for the native blood vessels after grafting. The in vivo test showed no significant difference between both grafts in terms of EEP and SHE. Conclusion: The post-graft hemodynamic energy was not different between the Dacron and ePTFE grafts. Artificial grafts are less compliant than native blood vessels; however, they can deliver pulsatile blood flow and hemodynamic energy without any significant energy loss.
Development of a Laparoscopic System for In Vivo Observation of the Bonghan Structure
임재관,Myungjin Chae,김정대,소광섭 사단법인약침학회 2009 Journal of Acupuncture & Meridian Studies Vol.2 No.3
Bonghan structures composed of corpuscles and ducts have been observed innumerous animal experiments. The structure has been suggested to be the physicalsubstrate for acupuncture points and meridians used in traditional Chinese medicine. The corpuscle-duct structure on the organ surface has been extensively studied. However, it was only observed after the abdomen of a rat was fully exposed. It maybe desirable to observe these structures under minimally invasive conditions. Ourlaparoscope is specifically designed for in situ, in vivo observation of the Bonghanstructure on the surface of internal organs in rats. We made a laparoscope consistingof a borescope combined with an illumination module and an imaging dataacquisition part. The Bonghan structure is transparent and is hard to see, even withthe borescope. Spraying a specific dye, trypan blue and washing with saline is anecessary process to visualize the structure. For this reason, we devised a stainingand washing system attached in parallel with the borescope in the laparoscopicsystem. The system operated successfully to reveal a Bonghan structure withoutsurgery. This tool opens a host of possible applications such as observation of flow ofstained liquid or drug in the Bonghan duct flowing from the skin to internal organs,and long-term observation of the physiological changes in Bonghan corpuscles.
국내 응급의학과 전공의의 24시간 연속근무 및 빈번한 야간근무 현황
임재관,이형민,조광현,기동훈 대한응급의학회 2019 대한응급의학회지 Vol.30 No.6
Objective: The newly implemented Training Rule Standard limits the amount of resident working hours to serve the interests of the patients and residents alike. On the other hand, the law does not sufficiently protect emergency medicine residents from a long shift length and frequent night shift. Excessive shift work can cause physical and neuropsychological problems for residents. Therefore, this study examined the 24-hour shifts and night shifts status of emergency medicine residents at the training hospitals. Methods: The 30 training hospitals were divided into three groups according to the number of residents (≤4, 5-8, and ≥ 9) and the associations between each group and the 24-hour shifts, night shifts, number of working days, working hours, and annual patients per resident were checked. The associations between the resident grades and 24-hour shifts, night shifts, number of working days and working hours were also examined. Results: Hospital groups with fewer residents had the highest number of patients per resident with the highest number of 24-hour shifts and the highest number of night shifts. The first year residents had the highest number of 24-hour shifts, the highest number of night shifts, and the highest number of working hours. Conclusion: More 24-hour shifts and more night shifts occur at hospitals that lack work force. Therefore, there is a need for new standards for limiting the working hours and frequency of night shifts in emergency rooms, and there is a need for discussions on reinforcing the work force.
임재관(Jaekwan Im),김민규(Minkyu Kim),이상훈(Sanghoon Lee),김재식(Jaesik Kim),최재호(Jaeho Choi) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
오늘날 스마트 그리드, 하이브리드 자동차 등에 관한 연구가 활발히 진행됨에 따라 에너지 저장장치에 관한 관심이 높아지고 있다. 그 중 연구가 활발히 진행되어지고 있는 배터리인 Ni-Mh와 Li-polymer의 모델링한 연구에 대하여 시뮬레이션을 하였고 모델링 방법과 성능에 대하여 비교하여 보았다.
임재관(Jaekwan Im),아윱(Windarko Novie Ayub),최재호(Jaeho Choi),정교범(Gyo-Bum Chung) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
하이브리드 자동차용 리튬이온 전지의 전기적 특성의 모델링은 자동차 전기에너지 공급시스템의 특성을 파악하는데 매우 중요하다. 본 논문은 리튬이온 전지의 동적특성을 모사하기 위한 전기적 등가 모델을 제안하였다. 리튬이온 전지의 모델 파라미터는 Maccor 8500 충방전시험장치를 이용하여 측정하였으며, 측정된 데이터와 Takacs 함수를 사용하여 전지의 충방전 특성을 고려한 비선형 모델을 정의하였다. 제안된 전지모델의 PSiM 모델을 개발하고 시뮬레이션 결과와 실험결과를 비교하여 제안된 모델의 타당성을 검증하였다.