An Exprimental Study of Postoperative Intraabdominal Adhesions

이봉우,최봉락,양동휘,김인호,손수상,강중신 啓明大學校 醫科大學 1986 계명의대학술지 Vol.5 No.2

수술후 나타나는 장유착은 적지 않은 빈도를 나타내며 보편화된 개복 수술후 증가된 유착성 장폐색증은 외과영역에서 중요한 문제의 하나로 많은 연구보고가 되고 있으며 유착의 형성은 기계적, 세균학적 및 화학적 외상 즉 복강내 외상이나 손상후의 치유과정의 한단계로 유착이 나타난다고 한다. 장유착의 원인과 이차적인 병태생리학적인 변화에 대한 충분한 이해를 갖고 조기에 적절한 치료를 하면 이병율과 사망율을 감소시킬 수 있는 질환이다. 저자들은 한국산 성숙된 가토를 이용하여 실시한 실험적 연구로써 도끼 60마리를 각 20마리씩 3군으로 나누어 관찰하였다. 즉 모든 토끼는 ether로 open drip마취를 하고 정중선 복별절개로 개복한 후 5.0+ 5.0cm정도의 전벽복막을 점상 출혈이 나타날 때 까지 찰과상을 형성시켜 그 결과를 관찰하였다. 제1군의 20마리는 단지 scratching method만 시행한 control group으로 하고 제2군의 20마리에서는 scratchiing method 후 복강내 polyethylene feeding tube를 넣고 매일 50ㅊㅊ의 생리식염수를 중비하였으며 제3군 20마리에서는 복강투석액인 peritosol solution으로 생리식염수 대신에 매일 50cc씩 복강내에 주입하여 관찰 비교하였다. 모든 토끼들은 개복술 10일후 재 개복하여 복막의 유착과 소장간의 유착정도를 관찰비교하여 다음과 같은 결과를 얻었기에 문헌고찰과 함께 보고하는 바이다. Control group에서는 20예중 유착정도가 15예에서 나타나 75%를 나타내었고 생리식염수 투여군에서는 20예중 13예에서 나타나 65%의 유착을 나타내었으며 peritosol군에서는 20예중 9예로서 45%로 감소된 유착양상을 나타내었다. 본 실험에서는 peritosol투여군이 control group이나 생리식염수 투여군보다 실험적 유착상태가 적은 것에 유의를 하였으며 아직 인체에 peritosol세척 시도는 못해 보았지만, 본실험과 같은 효과가 있다면 술후 장유착 예방에 의의가 있을 것으로 사료되어 보고 드리는 바이다.

위성측지측량을 위한 GPS 신속 관측기법의 활용에 관한 연구

이동락,박운용,신상철 東亞大學校 大學院 1995 大學院論文集 Vol.20 No.-

The NAVSTAR GPS(NAVigation System with Time and Ranging Global Positioning System)is a satellite-based radio navigation system providing precise three-dimensional position, navigation, and time information to suitably equipped users. The system will be continuously avilable on a world-wide basis, and is independent of meteorological conditions. The Global Positioning System was primarily designed for military navigation system by the US Department of Defense(DoD) in 1973. It has been successfully used in civilian geodetic surveying since 1983. Thereafter, it has been proved that GPS is the most valuable and excellent method, that ever exist in positionong system. Previous application of GPS was mainly based on the time-consuming static measurement which is combined with the results of existing triangulation or trilaterlation. Presently, however, new rapid methods are developed by using the experience of static method. These satisfy the most advantage of GPS in aspect of rapidity, accuracy and economy. In the relative kinematic methods, one antenna is always fixed at reference station and the other one travels sequentially to measuring points. Although rapid measurement method takes a few seconds or minutes, it cope with the accuracy of static method. In this paper, the characteristics of new methods are presented. Also many experiences are discussed about the coastal GPS experiment where the Kinematic Differential GPS is needed to detect the morphologic changes.

GPS/GPR을 이용한 저수지 준설능력 향상

이재원,이동락,엄장섭 東亞大學校 建設技術硏究所 2008 硏究論文集 Vol.31 No.2

일반적으로 퇴적물 준설에 대한 조사는 GPS/Echo Sounder 및 Total Station/Echo Sounder를 조합하여 대상지의 수평위치 및 수심에 대한 관측을 실시하고 있으며, 하상의 단면계산 저수량 및 준설계획량 등을 추정 이후 준설계획에 대한 계획고 및 준설토량에 대한 세부적인 계획을 수립하게 된다. 하지만 Echo Sounder를 사용하는 음파탐사 방법은 퇴적물에 대한 정확한 분포를 파악할 수 없는 단점이 있다. 본 연구는 저수지 하부의 퇴적물 및 이의 분포를 파악하여 저수지 준설계획을 수립하여 기존의 탐사방법에 대한 준설능력 향상에 중점을 두었으며, 기존의 음파탐사 방식과 다른 레이더탐사 장비를 이용한 GPS/GPR(Ground Penetration Radar)을 사용하여 저수지의 수평위치, 수심값을 결정하고 동시에 원 지반에 분포하고 있는 퇴적물의 분포를 추정, 준설에 적용하고자 하였다. 우선 현장의 시료채취를 통한 수조모형실험을 실시하여 장비에 대한 정확도 검증을 거친 후 현장적용에 적용하여 그 가능성을 평가하였다.

위성신호 특성에 따른 항공삼각측량의 결합 번들블럭조정

박운용,이동락,신상철,김천영 동아대학교 건설기술연구소 1998 硏究報告 Vol.22 No.1

Recently, GPS-aided aerial triangulation becomes a standard technique for topographic mapping. The main reason for wide spreading of combined bundle adjustment with GPS is the cost savings through considerably reduction of ground control points without loss of accuracy in comparison with conventional method. Another advantage of GPS-Photogrammetry is the real time flight navigation which enables to conduct the preplanned overlap and exposure time exactly. The combined bundle block adjustment with projection center coordinates determined by kinematic DGPS-positioning has reached a high level of accuracy. Standard deviations of the ground coordinates of ±10cm or even better can be reached. On this accuracy level also smaller error components are becoming more important. One major point of this is the interpolation of the projection centers as a function of time between the GPS-antenna locations. As a result of introducing DGPS-data into the block adjustment instead of ground control points, with only the control points located at both ends of blocks, it was possible to get same levels of accuracy as that of conventional block adjustment that needs a few control points. In case that the geometry of block is good, with one control point or without control points it was possible to adjust, but at least four control points were necessary to correct the errors remained in the kinematic positions effectively.

완전뇌허혈후 재관류시에 국소뇌혈류, 체성감각유발전위 및 신경학적 회복에 대한 Mannitol과 Thiopental의 효과

박춘근,이상원,박영섭,최승진,허필우,정동섭,강준기,최창락 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.2

The cardiopulmonary bypass or cerebral circulation arrest is often used in the treatment of complex aneurysm or of arteriovenous malformation to decrease the risk of intraoperative aneurysm rupture. Although experimental studies have suggested that some drugs may protect the brain from ischemic injury, there are limitations in maintaining cerebral perfusion arrest without incurring neurologic deficits due to the initiation of detrimental processes including excitotoxic neuronal injury, activation of phospholipases, influx of calcium, and generation of damaging free radicals. The purpose of this study is to determine wheter mannitol or thiopental has any favorable effects on the recovery of neurologic deficits and on the regional cerebral blood flow(rCBF), somatosensory evoked potential(SEP) and electroencephalogram(EEG) in cats which underwent 15 minutes-complete global ishcemia-reperfusion. The complete global ischemia was produced in 38 cats by temporary intrathoracic occlusion of the innominate artery and the subclavian artery following ligation of bilateral mammary arteries and simultaneous induction of hypotension. The cats were allocated randomly to one of 4 treatment groups : (1) control group, 8 cats received equal volume of saline solution : (2) thiopental group, 10 cats received 45㎎/㎏ thiopental intravenously, (3) mannitol group, 10 cats received 2g/㎏ mannitol intravenously, (4) combined mannitol and thiopental group, 10 cats received equal dose of mannitol and thiopental intravenously. The drugs were administrated in a equally divided dosage before and after the ischemic episode. The results were as follos : 1) Eight animals which received saline showed the severe postischemic hypoperfusion and poor recovery of SEP and EEG, and 6 of them died within 6 hours after the ischemia. 2) Ten thiopental-treated animals also showed the severe postischemic hypoperfusion and poor recovery of SEP and EEG, and 6 of them died within 6 hours the ischemia. 3) Both mannitol-and combined treated groups showed early recovery of EEG, good recovery of SEP and EEG without the severe postischemic hypoperfusion, and 7 of 10 mannitol-treated animals and 8 of 10 combined treated animals were significantly recovered in all parameters. There were not significant differences in all parameters between the mannitol-and combined treated groups. 4) Thirty-four of 38 animals involved in this 15 minutes-ischemia resulted in the severe neurologic deficits inspite of treatment with mannitol, thiopental or both of them. These results suggest that, in cats, mannitol treatment is effective but not thiopental in preventing severe neurologic injury following complete global ischemia and the duration of complete ischemia should be far less than 15 minutes.

동적 GPS 관측값을 이용한 수신기 위치 결정에 관한 연구

김희규,이동락,이인수 慶南專門大學 1998 論文集 Vol.26 No.1

建築物을 土地情報시스템에 登錄하는 方法의 硏究

박운용,이동락,백기석 東亞大學校建設技術硏究所 2004 硏究論文集 Vol.28 No.1

In this study. we investigated 3 methods for precise registration of buildings into LIS. They are : 1. using digital topographic maps. 2. using registered building maps. 3. cadastral surveyings on sites. The first method was found that it hardly met required precision. and the second one was also lack of precision because of unmatched actual buildings with registered ones and many unregistered buildings. The last method produced the most precise results. although it required laborious cadastral surveyings on sites. Considering the importance of building registration as it shows the ownerships of properties. the third method was thought to be desirable.

지붕경사각 변화에 따른 막구조의 풍압 변화 특성

길용식,김동우,하영철,이광렬,김종락 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This paper describes on the results of 1:400 geometrical laboratory modeling of wind-induced point pressure on the membrane roof structure of Stadium with variable roof slopes. The wind flow for flat ground surface was simulated in a boundary wind tunnel at Kumoh National Institute of Technology. The roof slope of membrane structure changed into 5 types. The locations of wind pressures taps are distributed on the same upper and lower part of membrane roof. The resultant wind pressure for each measurement points are analysed on 2 categories. One is acting on upper direction, the other is lower direction. The results showed that in the case of upper direction the changes of wind pressures on the membrane roof are not dominant in regard to changing roof slope, but in lower direction wind pressures are increased at the rear part of roof with changing roof slopes.

흉곽 내시경을 사용한 척추 기형 수술시 학습 곡선

김학선,최윤락,이환모,문성환,김경희,박진오,하중원,신동은 대한척추외과학회 2003 대한척추외과학회지 Vol.10 No.3

GPS 관측에 의한 지오이드고에 관한 연구

박운용,홍순헌,이동락 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2

This reseach is about the decision of accurate altitude to use GPS(Global Positoning System : TOPCON GP-R1) satellite. I reckoned diversional outcome using 7-Parameter method, MRE(Multiple Regression Equations)method, and Standard-Molodensky method in this study. Also, to decide accurate Geoid Height, I decided the Geoid Height of each observation point using both WGS 84 (World Geodetic System 84) Geoid-Height and the OSU91A(Ohio State University 91 A) Geoid model. They were decided form GPS reception. To the examine of the results, it was used MSL(Mean Sea Level), which was decided through tidal obervation. The above research result show that 7 Parameter method was very excellent among the three method of coordinate transformation. I obtained the results :δ=±50cm in the horizontal position and δ=±30cm in the vertical position. Form this time, on the development of Geoid model to suit our country for the outcome of better result.