Efficacy of Staged Surgery in the Treatment of Open Tibial Fractures with Severe Soft Tissue Injury and Bone Defect

윤용철,김영우,송형근,윤영현 연세대학교의과대학 2022 Yonsei medical journal Vol.63 No.10

Purpose: We aimed to report the clinical and radiological outcomes of staged surgery using the acute induced membrane tech nique with an antibiotic-impregnated cement spacer (ACS) and soft-tissue reconstructive surgery and to identify factors affecting clinical outcomes. Materials and Methods: Thirty-two patients with severe open tibia fractures were treated via staged surgery from January 2014 to December 2019 and followed up for ≥1 year. In the first surgery, an ACS was inserted into the bone defect site along with debride ment and irrigation and was temporarily fixed in place with an external fixator. The internal fixator was placed, and flap surgery and cement spacer changes were performed during the next surgery. In the third surgery, an autogenous bone graft was performed. Ra diologic and functional results were investigated according to the Association for the Study and Application of the Method of Ilizarov (ASAMI) criteria, and factors affecting the ASAMI score were analyzed. Results: The average bone defect width was 43.9 mm, and the size of soft-tissue defect was 79.3 cm2. Bone union was achieved in all cases except one and required 9.4 months on average. Complications occurred in 10 cases (31.2%). Good or better clinical ef fects, in terms of ASAMI radiologic and functional scores, were observed in 29 and 24 cases, respectively. Complications and ad ditional surgery were common factors affecting the two scores. Conclusion: Staged surgery using the acute induced membrane technique and soft-tissue reconstructive surgery is an efficacious treatment for open tibial fractures with bone defects.

온수배관에 의한 온실 내부의 온도변화

윤용철,신익수,배승범,김현태,최진식,서원명 경상대학교 농업생명과학연구원 2012 농업생명과학연구 Vol.46 No.2

This study was performed to obtain a heat saving effect and enhance the efficiency of a greenhouse by using a hot water piping in order to minimize the operating costs of a greenhouse as oil prices continue to rise. This method also reduces the likelihood of accidents caused by snowdrifts in regions with heavy snowfall. In general, the experimental plot was 2.0~6.0℃ higher than the control plot. When the skylight felt was opened, the minimum temperature was in the range of 3.0~12.0℃. Therefore, we judged that damage caused by snowdrifts may be prevented partly by active heating. The temperature difference inside of the greenhouse by height was insignificant. The maximum heating load of the greenhouse according to crop was respectively about 37,000 kcal․h-1 and 41,700 kcal․h-1. During the experiment, the heat value of each designed temperature in the range of the minimum ambient temperature -11.9~4.0℃ was about 95,000~322,000 kcal and it was in the range of 6,050~20,900 kcal․h-1. If it is compared with the maximum heating load, it can be shown that about 15~56% of the heating energy can be supplied. The total heat value and the amount of power consumption were 2,629,025 kcal and 677.3 kWh respectively during the experiment. If it is heated with diesel, a fossil fuel, the consumption during the experiment was 291 L and the cost was 331,700won. Total cost of using electric power was about 24,400 won and it is shown that it is about 7.5% of the cost of diesel consumption. Also, if the total amount of power consumption is converted into energy, it is approximately 582,200 kcal and the energy was just about 22% of the total heat value. 본 연구는 유가상승에 따른 온실의 경영비 절감과 적설지역의 적설재해를 경감시키기 위하여 온수배관을 이용한 난방효과 및 온실곡부의 온도 상승효과를 구명하고자 수행되었다. 전체적으로 실험구의 온도가 대비구 보다 약 2.0~6.0℃정도 높게 나타났다. 천창부직포를 개방한 경우, 최저온도가 약 3.0~ 12.0℃범위로 나타나 적극적인 난방을 하게 되면 적설피해도 어느 정도 예방할 수 있을 것으로 판단되었다. 온실 내부의 높이별 온도 차이는 미미한 것으로 나타났다. 재배작물에 따른 온실의 최대난방부하는 각각 약 37,000 kcal․h-1 및 41,700 kcal․h-1정도이었다. 실험기간동안 최저 외기온 -11.9~4.0℃ 범위에서 설정온도별 발열량은 95,000~322,000 kcal 정도로서 시간당 6,050~20,900 kcal․h-1정도의 범위에 있었고, 최대난방부하와 비교하면 약 15~56%정도의 난방에너지를 공급할 수 있을 것으로 나타났다. 그리고 실험기간동안 전체 발열량과 소비전력량은 각각 2,629,025 kcal 및 677.3 kWh이었다. 화석연료인 경유로 난방 할 경우, 실험기간동안 소요되는 소비량은 291L 정도이었고, 비용은 331,700 won인 것으로 나타났다. 전력사용에 대한 총비용은 24,400 won정도로서 경유 소비 비용의 7.5%정도로 나타났다. 또한 전체 소비전력량을 에너지로 환산하면 약 582,200 kcal이고, 이 에너지는 전체 발열량의 약 22%에 불과하였다.

경사지 빗물자원화 시설의 안정성 검토방안 연구

윤용철,오태한,김영주,서원명,유찬,윤성욱,임재운 경상대학교 농업생명과학연구원 2010 농업생명과학연구 Vol.44 No.3

본 연구에서는 시범적으로 빗물 자원화 시설을 설치하여 대상 단면에 대해서 그 운영과정을 가정하여 안정해석 방안을 검토하여 그 결과를 정리하였다. 안정해석에서는 시설물이 정상적으로 운영되는 경우와 비정상적인 상황을 가상하여 실제 지반조사 자료를 근거로 컴퓨터 모델을 이용하여 해석을 실시하였다. 해석결과 이상상황에 대한 해석결과보다는 정상상태로 운용하는 경우에 안정성이 낮은 것으로 나타나 설계나 유지관리를 위해서는 저수조의 규격결정시 토질조사가 중요한 것으로 판단되었다. In this study, rainwater resources facilities were constructed on the slope as a feasibility study. It is considered that rainwater resources facilities were constructed with the selected cross-section, and the stability analyses in cases of normal and abnormal condition were conducted as using the computer model. As a result of the stability analysis, the stability of the selected cross-section in the case of normal operation was lower than in the case of abnormal condition. Therefore, In order to design and maintain the rainwater resources facilities, it is likely that soil surveys are certainly carried out before the decision of the specification of rainwater resources facilities.

설정온도별 온실내 잉여 태양에너지 분석

윤용철,권순주,김현태,김영주,서원명 경상대학교 농업생명과학연구원 2012 농업생명과학연구 Vol.46 No.1

This study is about an analysis of surplus solar energy by important greenhouse types as well as setting temperature different by using Typical Meteorological Year data which was secured in order to provide basic data for designing an optimum thermal storage system to accumulate surplus solar energy generating in greenhouses during the daytime. Depending on the setting temperatures of 15~19℃ for greenhouse heating during day and night, surplus heat amounts were varied at the rate of about 0.2~6.9%/4℃ with some variations according to the greenhouse types and regions. On the other hand, the variations of supplemental heat requirements were about 29.7~50.0%/4℃. Depending on the setting temperatures for greenhouse ventilations(low 25~29℃ and high 27~31℃), surplus heat amounts were varied at the rate of about -9.9~-35.6%/4℃ in auto-type greenhouse. But in single-type greenhouses, they were about -5.1~-13.4%/4℃. There were not significant changes in supplemental heat amounts depending on setting temperatures of ventilation for both greenhouse types and regions. 본 연구는 주간동안 온실 내에서 발생되는 잉여 태양에너지의 적정 축열 시스템 설계에 필요한 기초자료를 제공할 목적으로 확보한 표준기상년 데이터를 이용하여 설정온도별로 잉여 태양에너지를 분석하였다. 주야간 설정온도를 단계별로 증가(15~19℃)시킨 경우, 온실형태와 지역별로 잉여 태양에너지는 0.2~6.9%정도 증가하여 그 증가폭은 미미하지만 다소 완만히 증가함을 알 수 있었다. 그리고 소요 난방에너지는 29.7~50.0%정도 증가하여 잉여 태양에너지의 증가율 보다 훨씬 큰 폭으로 증가하는 것을 알 수 있었다. 환기 설정온도를 단계별로 증가(저속 25~29℃, 고속 27~31℃)시킨 경우, 자동화 온실은 지역별로 잉여 태양에너지는 9.9~35.6%정도로 감소하는 것으로 나타났다. 그리고 단동형 온실은 지역별로 5.1~13.4%정도로 감소하는 것으로 나타나 자동화 온실에 비해 감소의 폭이 상대적으로 작았다. 또한 소요 난방에너지는 온실형태 및 지역별로 다소 증가하거나 감소하는 경우도 있었지만, 그 영향은 아주 미미한 것으로 나타났다.

Comparison of a Novel Box-Frame External Fixator and Conventional Delta-Frame External Fixator in the Staged Treatment of Distal Tibia Fractures

윤용철,신민규,오창욱,오종건 대한골절학회 2020 대한골절학회지 Vol.33 No.3

Purpose: Distal tibia fractures with severe soft-tissue edema or intra-articular fractures are treated by staged operations using external fixators. Definitive surgery that maintains ligamentotaxis has been difficult using existing fixators. This study introduced a novel ‘box-frame’ external fixator and evaluated its clinical usefulness. Materials and Methods: This study included 45 patients (32 males, 13 females) diagnosed with distal tibia fractures who underwent staged operations between March 2012 and March 2016, with a follow-up of at least one year. The patients were divided into two groups. In one group, fixation was performed with a box-frame external fixator (Group A). In the other group, fixation was performed with a delta-frame external fixator (Group B). The following outcomes were evaluated: the time until definitive surgery, operative time of the definitive surgery, radiation exposure time, bone union, time to achieve bone union, postsurgical complications, American Orthopaedic Foot & Ankle Society anklehindfoot score, and ankle range of motion. Results: Compared to the delta-frame, the box-frame showed a statistically significant reduction in the mean radiation-exposure time and operative time during the definitive surgery by 58 seconds and 25 minutes, respectively. The differences in the time until definitive surgery, bone union, time to achieve bone union, postsurgical complications, and functional scores were not significant. Conclusion: The box-frame external fixator can be a useful treatment method in the staged surgery of distal tibia fractures.

파이프 골조온실의 민말뚝과 주름말뚝의 인발저항력

윤용철,서원명,조재홍 (사) 한국생물환경조절학회 2001 생물환경조절학회지 Vol.10 No.3

The uplift capacity of a pile for improving the wind resistance of the 1-2 W type plastic film pipe ongreenhouses was tested using the plane and corrugated piles with various shapes and diameters. First,the resistant uplift capacity was measured by using the uplift loading on plane piles. As the upliftloading on plane piles increased, the resistant uplift capacity also increased until the loading wasreached to ultimate uplift capacity. After the ultimate uplift capacity was appeared the uplift displace-ment, the uplift capacity was decreased gradually. Secondly, the resistant uplift capacity was mea-sured by using the uplift loading on corrugated piles. After the uplift capacity was reached the upliftdisplacement, the uplift capacity was continually increased or decreased. In general, the ultimateuplift capacity was independent of pile shapes, pile diameter length, and embedded pipe depth. How-ever, the ultimate uplift capacity of a corrugated pile was twice more than that of a plane pile withoutregard to its diameter and embedded depth. The ultimate uplift capacity per unit pile area wasincreasing in deeper embedded depth. However, the longer a pile diameter was, the less ultimate upliftcapacity. The uplift capacity of a plane pile, used in conjunction with the design wind velocity(26.9 ms-1) of the project area, was unsatisfiable without regard to diameters and embedded depthsof piles, while most of corrugated piles were well appeared uplift capacity under various experimentalconditions.

태풍에 의한 파이프 골조 온실의 변형도

윤용철 한국농공학회 2002 한국농공학회논문집 Vol.44 No.4

온실의 시설의 구조와 안전관리 방안

윤용철 경상대학교 시설원예연구소 1996 施設園藝硏究 Vol.3 No.-

2-D OCDMA LAN에서의 검출기와 간섭 모델의 성능에 대한 비교 연구

윤용철,최진우,성원진 한국통신학회 2003 韓國通信學會論文誌 Vol.28 No.4B

Optical CDMA 근거리망을 위한 M-진 전송기술에 대한 연구

윤용철,최진우,김영록 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.8