공원묘지 유실에 의한 대량재해의 개인식별

강신몽,이한영,윤중진,이원태,김종열,이영석,서재관,최득린,서지석,이혜경 大韓法醫學會 1992 대한법의학회지 Vol.16 No.1

Individual identification of severely decomposed or skeletonized bodies is an important part in medicolegal field. 142 bodies were torn up and carried away by flood in a park cemetry, Kwang-Ju, Kyunggi province, Korea at Sept., 10, 1990. The authors examed the 56 bodies, which were gained, through medical, anthropological, odontological, radiological methods, and superimposition for individual identification. Among them, 41 cases were successfully identified, and remaining 15 cases were not identified because of sever destruction and no adequate information.

KAL기 추락에 의한 대량재해의 개인식별

강신몽,이원태,고영창,최상규,김윤희,이홍석,서재관,윤중진,이혜경,최득린,김종열,윤창육,변명식,이장홍 大韓法醫學會 1991 대한법의학회지 Vol.15 No.2

Individual identification is an important part in medicolegal field especially in mass disaster. At July, 27, 1989, KAL KE-803 was crashed on landing at Tripoli International Airport, Liba. The plane was caught in fire and sixty eight Koreans were sacrified. The majority of victims were severely charred and injured. The authors examed all dead bodies and successfully identified all the cases through visual, anthropological, odontological, radiological and pathological methods including fingerprint and blood typing.

세 개의 회전축을 가진 5축 밀링 가공의 NC 데이터 후처리 방법

윤재득(Jae-Deuk Yun),정융호(Yoong-Ho Jung),김태경(Tae-Gyeong Kim) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-

We present a postprocessing algorithm for 5-axis machines, which can be applied to 2 rotary axes (2R-3L) types and 3 rotary axes (3R-2L) types. Five-axis machining requires a postprocessor for converting cutter-location (CL) data to machine-control (NC) data. The existing methods for postprocessing use inverse kinematics equations from the forward kinematics. However, for 5-axis machines with three rotary axes, the inverse kinematics equations cannot be induced directly, because the forward kinematics equations are nonlinear. To derive the joint values from the forward kinematics equations, previous algorithms use numerical methods for the postprocessing; this requires a search algorithm with much computation time and may fail to obtain a solution. We propose a general method for the postprocessing that can be applied to both 2-rotary and 3-rotary 5-axis machines. Our algorithm has three advantages: first, the forward kinematics equations are not required; second, the method is reliable and eliminates the need for numerical methods for the inverse kinematics, which results in exact solution; and finally, the proposed algorithm can also be applied to 2R-3L 5-axis machines.

세 개의 회전축을 가진 5축 밀링 가공의 NC 데이터 후처리 방법

윤재득(Jae-Deuk Yun),정융호(Yoong-Ho Jung),김태경(Tae-Gyeong Kim) 한국생산제조학회 2009 한국생산제조시스템학회 학술발표대회 논문집 Vol.2009 No.10

We present a postprocessing algorithm for 5-axis machines, which can be applied to 2 rotary axes (2R-3L) types and 3 rotary axes (3R-2L) types. Five-axis machining requires a postprocessor for converting cutter-location (CL) data to machine-control (NC) data. The existing methods for postprocessing use inverse kinematics equations from the forward kinematics. However, for 5-axis machines with three rotary axes, the inverse kinematics equations cannot be induced directly, because the forward kinematics equations are nonlinear. To derive the joint values from the forward kinematics equations, previous algorithms use numerical methods for the postprocessing; this requires a search algorithm with much computation time and may fail to obtain a solution. We propose a general method for the postprocessing that can be applied to both 2-rotary and 3-rotary 5-axis machines. Our algorithm has three advantages: first, the forward kinematics equations are not required; second, the method is reliable and eliminates the need for numerical methods for the inverse kinematics, which results in exact solution; and finally, the proposed algorithm can also be applied to 2R-3L 5-axis machines.

양문형 냉장고 도어의 자동 단차 맞춤 메커니즘 개발

윤재득(Yun, Jae-Deuk),정융호(Jung, Yoong-Ho) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.7

최근 보편화되고 있는 대형 냉장고는 냉동실과 냉장실이 나란히 있는 양문형이다. 그런데 양문형 냉장고에 대한 고객들의 가장 큰 불만 중의 하나는 양쪽 도어를 닫았을 때 높이 차가 발생하는 문제이며, 이를 도어의 단차라 고 한다. 단차 문제의 가장 큰 원인은 냉장고가 설치되는 바닥이 평편하지 못하거나 사용 기간이 경과함에 따라 냉장 고 캐비닛이 변형되기 때문이다. 이러한 단차를 확인하였을 때 지금까지는 고객이나 A/S 직원이 렌치 등을 사용하여 냉장고 하부의 지지나사를 조절하여 냉장고의 수평을 맞춘다. 그러나 이러한 작업은 대형 냉장고의 경우 상대적으로 힘이 약한 주부나 노인이 조작하기에는 어려운 작업일 뿐만 아니라 이러한 방식을 고객에게 요구하는 것 자체가 고 객의 불만족을 야기할 수 있다. 본 연구는 이러한 문제를 해결하기 위해 도어의 단차를 자동으로 감지하여 양쪽 도어 를 같은 높이로 자동으로 조절해주는 새로운 메커니즘을 제안하였다. 제안된 메커니즘은 공구를 사용하여 힘들고 번 거롭게 단차를 조절할 필요 없이 냉장고의 도어를 열고 닫는 동작만으로 자동으로 단 맞춤이 가능하게 한다. Recently the increasingly common large refrigerator is the side by side(SBS) refrigerator whose freezing chamber and refrigerating chamber are set side by side. But one of the biggest dissatisfaction of customers about SBS refrigerator is that the two doors don't meet the same height when they are closed. It is called door height difference(DHD). The main cause of DHD is the unevenness of floor on which a refrigerator is placed or the cabinet deformation caused by long time use. When the DHD is confirmed, the customer or maintenance personnel use wrench to adjust the support screw to make the refrigerator to reach the horizontal position. But for big refrigerator, it is not only difficult for women and old people who don't have enough force to adjust it, but also inappropriate to require customers to do this job. In order to resolve this problem, this research proposes a new mechanism which can detect the DHD and adjust two doors to the same height automatically. The adjustment would be completed during opening and closing the doors, avoid needing hard operation with wrench by hand.

고혈압 환자의 대동맥 맥파전도속도 결정 인자

최우혁,백승덕,이원재,정태연,박재석,손석만,김준형,도윤정,박윤선,나득영,박건욱 東國大學校醫學硏究所 2003 東國醫學 Vol.10 No.1

최근 국내에서는 관상동맥 질환, 뇌경색, 고혈압성 심장질환같은 심혈관계 질환으로 인한 사망이 선진국에서처럼 많은 비율을 차지하고 있어 이러한 심혈관계 질환을 예방하기 위하여 위험인자들을 규명하기 위한 연구들이 활발히 진행되어왔다. 고혈압은 잘 알려진 심혈관계 위험인자로 고혈압 환자에서 심혈관계 이환율과 사망률은 큰 혈관의 병변과 상관이 있고, 고혈압 환자의 큰혈관 유순도(compliance)는 감소한다. 혈관 유순도를 직접 측정하여 수식화 할 수 있는 지표로는 맥파전도속도(pulse wave velocity, PWV)가 있다. 이러한 맥파전도속도와 혈관의 유순도는 역비례 관계에 있다. 이에 연구자는 동국대학교 경주병원 순환기내과를 방문하여 고혈압으로 진단된 45명을 대상으로 심초음파를 이용해서 맥파전도속도를 측정하여 Framingham study의 심혈관계 위험인자와의 산관과계를 알아보고, 고혈압 환자에서 어떤 심혈관계 위험인자들이 대동맥의 맥파전도속도를 결정하는지 조사하였다. 고혈압환자에서 도플러 심초음파를 이용한 맥파전도속도를 측정하여 연령과 24시간 활동 중 수축기 혈압이 상관과계가 있는 것으로 확인하였다. Background : From the Framingham study, it was reported that cardiovascular risk factors are hypertension, smoking, gender, lipid profile, diabetes mellitus, and ECG ventricular hypertrophy. The measurement of aortic pulse wave velocity(PWV) is a noninvasive technique that can integrate the vacular damages caused by the cardiovascular risk factors. The authors examined the relationship between cardiovascular risk factors of Framingham study and the PWV in hypertensive patients by doppler echocardiography. We also examined what kind of the cardiovascular risk factor determines aortic PWV. Method : For the determination of the PWV, tracings of aortic velocity were recorded by pulsed wave Doppler in hypertensive patients, non-simultaneously, at two points on the aorta : the isthmus (suprasternal approach) and near the diaphragm (substernal approach). Isthmus-diaphragm pulse wave delay was calculated as PWD=QV2 - Qv1, where Qv1 and QV2 represent the time delay between the ECG Q wave and the foot of the aortic velocity curve recorded, respectively, in the isthmus and near the diaphragm. The PWV was calculated as : PWV=L/PWD(m/s). L was the sternal length which was assimilated to the length of the descending thoracic aorta. We examined the relationship between various cardiovascular risk factors, such as age, gender, smoking, diabetes, lipid profile, LVH (left ventricular hypertrophy), and 24-hour ambulatory blood pressure, and PWV. Results : We observed a positive correlation between PWV and age, PWV and 24-hour ambulatory systolic blood pressure. We did not find a significant difference between PWV and other cardiovascular risk factors (sex, smoking, DM, LVH, and lipid) except age and 24-hour ambulatory systolic blood pressure. Conclusion : Determinants of aortic pulse wave velocity in patients with hypertension were age and 24-hour ambulatory systolic blood pressure.

Station for structural studies on macro objects: beamline 6C Bio Medical Imaging at the Pohang Light Source-II

Jae-Hong Lim,Seung-Jun Seo,Hyo-Yun Kim,Chun Kil Ryu,Seungyu Rah,Jung Yun Huang,Chae-Soon Lee,In Deuk Seo,Seob-Gu Kim,Dongyun Lee,Moo-Hyun Cho 한국구조생물학회 2017 Biodesign Vol.5 No.2

Similar to macromolecular crystallography (MX), radiography uses X-rays to reveal structures, however, of macro objects, which can be several orders of magnitude larger in size than the subjects of MX. Beamline 6C Bio Medical Imaging of the Pohang Light Source-II (PLS-II) utilizes synchrotron radiation X-rays to implement parallel beam projection radiography. Major applications are virtual anatomy of small animals and plants, non-invasive physiological monitoring and 3D histology in biology and medicine. Uses in material science and defect analysis of industrial products are also becoming popular. In this review, the use of the beamline is introduced including sample preparation, data acquisition and a workflow for 3D image reconstruction, visualization and analysis. For biologists who are familiar with MX, a brief comparison has been made between the two techniques. The mechanisms for spatial resolution determination and contrast formation in the parallel beam projection radiography are also presented.

Comparative study of postoperative stability between conventional orthognathic surgery and a surgery-first orthognathic approach after bilateral sagittal split ramus osteotomy for skeletal class III correction

Deuk Hyun Mah,Su Gwan Kim,Ji Su Oh,Jae Seek You,Seo Yun Jung,Won Gi Kim,Kyung Hwan Yu 대한구강악안면외과학회 2017 대한구강악안면외과학회지 Vol.43 No.1

Objectives: The purpose of this study is to compare the postoperative stability of conventional orthognathic surgery to a surgery-first orthognathic approach after bilateral sagittal split ramus osteotomy (BSSRO). Materials and Methods: The study included 20 patients who underwent BSSRO for skeletal class III conventional orthognathic surgery and 20 patients who underwent a surgery-first orthognathic approach. Serial lateral cephalograms were analyzed to identify skeletal changes before surgery (T0), immediately after surgery (T1), and after surgery (T2, after 1 year or at debonding). Results: The amount of relapse of the mandible in the conventional orthognathic surgery group from T1 to T2 was 2.23±0.92 mm (P<0.01) forward movement and -0.87±0.57 mm (non-significant, NS) upward movement on the basis of point B and 2.54±1.37 mm (P<0.01) forward movement and -1.18±0.79 mm (NS) upward movement on the basis of the pogonion (Pog) point. The relapse amount of the mandible in the surgery-first orthognathic approach group from T1 to T2 was 3.49±1.71 mm (P<0.01) forward movement and -1.78±0.81 mm (P<0.01) upward movement on the basis of the point B and 4.11±1.93 mm (P<0.01) forward movement and -2.40±0.98 mm (P<0.01) upward movement on the basis of the Pog. Conclusion: The greater horizontal and vertical relapse may appear because of counter-clockwise rotation of the mandible in surgery-first orthognathic approach. Therefore, careful planning and skeletal stability should be considered in orthognathic surgery.

MRI Findings of Obstructed Hemivagina and Ipsilateral Renal Agenesis (OHVIRA syndrome) with a Blind Megaureter: Case Report

Cho, Yun Hee,Sung, Deuk Jae,Han, Na Yeon,Park, Beom Jin,Kim, Min Ju,Sim, Ki Choon,Cho, Sung Bum Korean Society of Magnetic Resonance in Medicine 2015 Investigative Magnetic Resonance Imaging Vol.19 No.3

Obstructed hemivagina and ipsilateral renal anomaly (OHVIRA) syndrome is an uncommon congenital abnormality of the female urogenital tract characterized by the triad of uterine didelphys, obstructed hemivagina, and ipsilateral renal agenesis. A 13-year-old female presented with acute lower abdominal pain. Magnetic resonance imaging (MRI) revealed uterine didelphys, hematometrocolpos, obstructed hemivagina, and right ipsilateral agenesis, consistent with OHVIRA syndrome. Also, a well-defined mass with fluid signal intensity, mimicking adnexal neoplasm was seen in the right lower pelvic cavity adjacent to the posterior wall of the bladder. Vaginal septotomy and drainage of hematometrocolpos were done initially, but unilateral hysterectomy was later performed to relieve the patient's symptoms. The cystic mass in the right lower pelvic cavity was also excised and confirmed as a blind megaureter.

석조문화재 주변의 산사태 재해위험성 영향인자 추출 연구

이재호 ( Jae Ho Lee ),김교원 ( Gyo Won Kim ),장윤득 ( Yun Deuk Jang ),이하나 ( Ha Na Lee ),이윤수 ( Yun Su Lee ),김창덕 ( Chang Deok Kim ) 대한지질공학회 2008 대한지질공학회 학술발표회논문집 Vol.2008 No.-