근래 국내에서 일어난 특이한 형태의 자살 사례

권석현,김상호 한국과학수사학회 2014 과학수사학회지 Vol.8 No.4

As the suicide rate has been on the constant increase in South Korea, unusual suicide cases have occurred. Investigation agencies have faced difficulties solving the various and complex suicide cases. Whereas there have been the statistics of suicide and research on the reason of suicide, unusual suicide cases have not been reported in domestic academia. In foreign countries, uncommon suicide cases have been reported and these data have been effectively utilized for investigation. This study described the methods of two suicide cases happened inside the jurisdiction of Pyeongtaek Police Station by analysing and reenacting. The purpose was to provide the basic data in preparation for the similar suicide cases and relevant follow-up studies.

마이켈슨 간섭계를 이용한 투명판의 굴절률 측정

권석현,김석원 한국물리학회 2007 새물리 Vol.54 No.3

마이켈슨 간섭계 (Michelson interferometer)는 가장 보편적으로 사용되고 있는 간섭계로 빛의 간섭 현상을 이용하여 매질에 대한 정보를 얻거나 물체의 운동을 분석하는 데 사용되고 있다. 굴절률은 일정한 온도에서 물질에 따라서 고유의 값을 갖기 때문에 물질의 특성이 되고 여러 가지 광학 관련 분야에서 폭넓게 이용되고 있으므로 굴절률 측정은 매우 중요하다. 본 연구에서는 마이켈슨 간섭계에서 고체 투명판의 회전각도에 따라 움직이는 무늬수를 세어서 고체 투명판의 굴절률을 측정할 수 있는 이론을 고안하고 몇 가지 투명판의 굴절률을 측정하였다. 측정결과 표준시료로 사용한 BK7 유리의 굴절률은 같은 파장에서 정밀하게 측정한 참고 문헌치와 0.8 % 이내에서 일치하였다. The Michelson interferometer is the most widely-used interferometer and has been used to get information on materials or to analyze the motions of objects by using the interference phenomenon of light. Because the refractive index is an inherent value of a material at constant temperature, it becomes the characteristics of that material and is widely used in various optic fields, so it is very important to measure the refractive index. In this study, we derived an expression that can be used to calculate the refractive index of transparent plates by measuring the movement of fringes with the rotation of the plate in the Michelson interferometer, and we measured the refractive indices of several kinds of transparent plates. The result showed that the refractive index obtained for BK7 glass, used as a standard sample, agreed with the literature value to within 0.8 % at the same wavelength.

감마 금속정을 이용한 대퇴골 전자간 골절 치료의 합병증

권석현,전철홍,박진영,배규환,양정환 대한골절학회 2009 대한골절학회지 Vol.22 No.2

목적: 근위 대퇴골 전자간 골절에서 감마 금속정을 이용한 치료 후 합병증을 분석하고 그 합병증을 줄일 수 있는 방법을 알아보고자 하였다. 대상 및 방법: 2000년 1월에서 2005년 5월까지 감마 금속정으로 치료한 근위 대퇴골 전자간 골절 환자 중에서 1년 이상 추시 관찰이 가능한 96예를 대상으로 합병증 발생 유무를 조사하였다. 평균 추시 기간은 17.8개월 (12∼52개월)이었으며, 환자 연령은 평균 75.2세 (44∼96세)였다. 골절양상, 골절의 정복 상태, 지연나사의 대퇴 골두내 위치 및 활강의 정도, tip-apex index (TAD), 골질 등과 합병증과의 연관성에 대해서 분석하였다. 결과: 합병증이 총 12예 (12.5%)에서 발생하였다. 지연 나사 돌출이 5예, 짧은 지연 나사 사용으로 인한 내반고 변형이 2예, 원위 나사 파열이 1예, 술 중 drill bit 파손 1예, 표재성 감염이 2예, 심부 감염이 1예였다. 이 중 심각한 합병증으로 재수술이 필요한 경우는 4예 (4.2%)였다. 지연 나사 돌출이 발생한 5예 모두 TAD (tip apex distance)가 25 mm 이상으로 증가되어 있었다. 결 론: 감마정을 사용할 때 합병증 발생을 줄이기 위해서 수술 중 세심한 술기가 필요하며, 지연 나사의 정확한 위치 선정 및 적절한 길이 선택이 관절내 돌출과 내반고 변형의 합병증을 줄일 수 있을 것으로 사료된다.

Assessment Model on Environmental Economics for Construction Projects in Korea

권석현,김경주,김경민,조남호 대한토목학회 2012 KSCE Journal of Civil Engineering Vol.16 No.4

This study aims to propose an assessment model for environmental economics that will provide useful information for decisionmaking on the implementation of pro-environmental and economical construction projects. To meet this objective, this study suggests a procedure for estimating the environmental cost of construction projects. The model combines environmental load assessment and environmental value assessment. The environmental cost of pollutants generated from a construction project was estimated utilizing Contingent Valuation Method (CVM), a value assessment method borrowed from economic science. A case analysis was subsequently conducted to verify the applicability of the proposed model to actual construction projects. The devised model is expected to provide a useful methodology that will scientifically support the planning and management of sustainable construction not only in terms of the environmental aspect but also of the economical aspect.

Sewable soft shields for the γ-ray radiation

권석현,선정윤 한국고분자학회 2017 한국고분자학회 학술대회 연구논문 초록집 Vol.42 No.2

Outcomes of Cephalomedullary Nailing in Basicervical Fracture

권석현,이성현,국승환,최영채 대한고관절학회 2017 Hip and Pelvis Vol.29 No.4

Purpose: A basicervical femoral fracture is defined as a fracture of base of neck of femur that occurs medially from intertrochanteric line above lesser trochanter. In this study, we intended to evaluate radiological and clinical results of basicervical femoral fractures treated by intramedullary nailing. Materials and Methods: Fifteen patients, who underwent intramedullary nailing among 50 patients, out of 50 who were diagnosed with basicervical femoral fractures from July 2012 to May 2015 were studied. All of 15 patients’ fracture were two-part basicervical fractures. Using radiography, we characterized the: i) state of reduction, ii) location of the lag screw, iii) tip apex distance (TAD), and iv) sliding distance of lag screw and bone union. Additionally, we performed clinical assessment before injury and at final follow-up. Results: In radiological assessment, we achieved acceptable reduction state in all patients. All lag screws were fixated on appropriate locations. Mean TAD was 17.3 mm (11.0-21.1 mm), which showed insertion point of <25 mm in all cases. The mean sliding distance of the lag screw was 5.1 mm (0.1-16.0 mm) at the final follow-up. The mean bone union period was 4.8 months (3-10 months) with achieving in all cases. In clinical assessment, Harris hip score, visual analogue scale score and Western Ontario and McMaster Universities Arthritis Index score, all of them significantly improved postoperatively compared with preoperative scores (P<0.05). Conclusion: In elderly patients with basicervical femoral fractures, treatment with intramedullary nailing showed satisfactory results, considered to be a useful method if performed with skilled technique.

Gelation Dynamics of Ionically Crosslinked Alginate Gel with Various Cations

권석현,선정윤,윤주일,석현광,오규환 한국고분자학회 2015 Macromolecular Research Vol.23 No.12

Alginates can be crosslinked with multivalent cations, leading eventually to hydrogel formation. The properties of alginate gel depend on its lock structure, monomeric composition, concentration of polymer and cross linker. Among these, the properties of ionically crosslinked alginate gel can be greatly affected by multivalent cations as cross-linker. Knowledge of gelation dynamics by multivalent cations allows control over gelation characteristics, such as modulus of gel and the time required for equilibrium state, and healing properties. We have studied gelation dynamics of ionically crosslinked alginate gel. According to different types of anions bound with cations, gelation time and equilibrium viscosity was changed due to the solubility kinetics of the cation. The equilibrium viscosity is increased as the size of the cations increased even though the cations have same valency. A theoretical model is introduced to interpret dynamic change of viscosity during gelation.

Life Cycle Cost 기법에 의한 RC Slab 교량의 절감비용 예측에 관한 연구

권석현,김상범,박용진 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 논문집 Vol.11 No.5

연구는 교량의 경제성 평가를 통해 교량 가설시 유용한 정보를 제공하기 위해, RC Slab교를 대상으로 유지관리수준에 따른 교량의 LCC를 예측하여 절감비용을 예측하고자 하였다. 본 연구의 수행 결과를 정리하면 다음과 같다. (1) 사례교량 LCC 분석 모델을 제안하였다. (2) 교량의 유지관리수준을 현행과 필요로 구분하고, 분석기간은 80년, 실질할인율은 4.5%로 가정하여 사례대상 교량에 대한 유지관리수준별 LCC를 예측하였다. (3) 사례교량의 LCC 예측결과를 통하여 절감비용을 예측하고 경제적인 절감효과를 파악하였다. This study predicts Life Cycle Cost of RC Slab bridge case in maintenance and operation level and calculated economic efficiency by the avoidable costs of a bridge. This result of the study can be summarized as follow: (1) LCC analysis model on the bridge case is suggested. (2) Maintenance and operation level of a bridge have been divided, and LCC of the bridge case has been predicted at current maintenance and operation level and required maintenance and operation level. (3) Reduction costs is predicted by LCC of the bridge case, and its economic efficiency is calculated.

Elbow의 Superficial Radial Nerve에 발생한 결절종 1례 보고

권석현,김동철,김정우 圓光大學校 醫科學硏究所 2005 圓光醫科學 Vol.20 No.2

고관절 비구순의 해부학 및 기능

권석현,Kwon, Seok Hyun 대한관절경학회 2011 대한관절경학회지 Vol.15 No.2