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전산 가시화를 통한 무인 항공기용 연료전지 양극 산소 유로 최적화 연구
전지아(Ji-A Jeon),이재준(Jae-Jun Lee),송영수(Young-Su Song),김민수(Min-Su Kim),김건우(Gun Woo Kim),나영승(Youngseung Na),리광훈(Gwang Hoon Rhee) 한국가시화정보학회 2019 한국가시화정보학회지 Vol.17 No.1
Numerical visualization is conducted to confirm the variation of flow characteristics and pressure drop by the shape of channels on the cathode flow path in hydrogen fuel cells for unmanned aerial vehicles(UAVs). Generally, a light-weight fan is commonly used rather than a heavy air compressor at UAVS. However, in case of blower fan, a large pressure drop in the flow path causes the blocking of the oxygen supply to the fuel cell. Therefore, the uniformity of flow inside the cathode has to be achieved by changing the shape of the cathode. The flow channel, the duct shape, and the diameter of the fan are changed to optimize the flow path. As a result, it is confirmed that the optimal flow path can decrease the velocity difference between the center and outer flow by 1.8%. However, It should be noted that the channel size can increase the pressure drop.
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김재영(J-Young Kim),이재준(Jae-Jun Rhee) 대한정형외과학회 2008 대한정형외과학회지 Vol.43 No.1
목적: 신경병성 당뇨 환자에서 치유 되지 않는 만생 족저부 피부 궤양을 술기가 비교적 간단한 단 또는 이중 V-Y 전진 피판술을 이용하여 치료하고 그 결과를 분석하고자 한다. 대상 및 방법: 2004년 1월부터 2005년 12월까지 만성 당뇨병성 족저부 궤양으로 입원하여 치료를 받은 환자 중 단 또는 이중 V-Y 전진 피판술을 이용하여 상처를 치유하였던 29명의 환자를 대상으로 하였다. 대상 환자의 과거력, 당뇨, 혈류학적, 세균학적, 방사선학적 검사를 술 전 실시하였고, 상처의 위치 및 크기를 수술 중 조사하였으며, 괴사여부, 치유 기간, 재발 여부 등을 추시 기간 중 조사하였다. 결과: 대상 환자의 평균 나이는 53세(36-69)였다. 족저부 궤양의 발생 위치로는 전족부가 12예로 가장 많았고 후족부 9예, 발의 외측부 6예, 발의 내측부 2예였다. 족저부 궤양의 평균 이환 기간은 3.3개월(2-36)였고 궤양의 평균 면적은 2.05 ㎠ (0.8-3.9)였다. 수술 후 상처의 평균 치유 기간은 4.7주(3-8)였으며 다음날 부분적인 혈행의 장애 및 부분 괴사가 7예에서 발생하였으나 봉합사의 부분 발사와 이차 상처 치유 기전으로 모두 치유되었다. 추시 중 5예에서 재발이 있었다. 결론: 당뇨병 환자에서 발생한 신경병성 만성 족저부 궤양의 치료에 있어 V-Y 전진 피판술은 매우 유용한 치료로 사료되나 수술 상처의 지연 치유가 자주 발생하고 일반 환자군보다 더 오랜 기간 동안 발을 보호해야 함을 관찰할 수 있었다. Purpose: This study examined the results of a single or double V-Y advancement flap, which was found to be technically simple for the management of chronic plantar ulcer in patients with neuropathic diabetic foot. Materials and Methods: From January 2004 to December 2005, 29 patients who were hospitalized for the management of a neuropathic diabetic foot plantar ulcer were examined. All patients underwent single-or double-V-Y advancement flap for the management of the ulceration. Hematological, hemodynamic, diabetic, bacteriologic, and radiological tests wereperformed prior to surgery. The condition of the wound was checked during surgery, and the healing rate, healing time and recurrence during the follow-up examinations were evaluated after surgery. Results: The mean age of the patients was 53.4 years (36-69). The plantar ulcers were the most commonly found in the forefoot area (12 cases). Nine cases showed ulcers in the hindfoot area, 6 cases were found are in the lateral foot area, and 2 cases were identified in the medial foot area. The area covered with the V-Y advancement flap averaged 2.05 ㎠ (0.8-3.9). The mean healing time of the wound was 4.7 weeks (3-8). One day after surgery, there were 7 cases of partial circulation disturbance that were managed with a partial stitch out and secondary intension wound healing. There were 5 cases of recurrence of the wound. Conclusion: A V-Y advancement flap to manage chronic diabetic plantar ulcers can produce excellent or good results. However, a high incidence of delay in healing of the surgical wound can be expected, and a longer period is needed to protect the wound comparing with normal patients.
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당뇨병성 족부 궤양에서 고 농도 은($Ag^+$) 도포 포말 드레싱을 이용한 전 접촉 석고 붕대 치료 결과
김재영,최재혁,이경태,양기원,김진수,이재준,Kim, J-Young,Choi, Jae-Hyuck,Lee, Kyung-Tai,Young, Ki-Won,Kim, Jin-Su,Rhee, Jae-Jun 대한족부족관절학회 2006 대한족부족관절학회지 Vol.10 No.2
Purpose: The treatment of diabetic foot ulcers with total contact cast has been reported to be associated with numerous undesirable complications. This study shows that our technique of total contact casting that incorporates high concentration silver coated foam dressing. Materials and Methods: Forty-four diabetic foot ulcers were treated with total contact cast along with high concentration silver coated foam dressing. Complication and healing rates were evaluated. Results: Eighty five percent of the ulcers healed within 6 weeks with an overall complication rate of 7%. There were only two cases (5%) of infection and no recurrent ulceration and no another site new pressure ulcer in our study. Conclusion: Total contact casting incorporates high concentration silver coated foam dressing resulted in fewer complications rate and healing rate that is comparable to other studies.
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