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이재덕,이서원,이재원,신제균,Lee, Jae-Deok,Lee, Seo-Won,Lee, Jae-Won,Sin, Je-Gyun 대한흉부심장혈관외과학회 1996 Journal of Chest Surgery (J Chest Surg) Vol.29 No.6
Recently, we report a surgical experience of one case of acute prosthetic valve failure due to throe- bosis. The patient was 39-year old male who complained of dyspnea and orthopnea for 3 days before admission. The patient had not taken anticoagulant therapy for recent 4 months against medical ad- vice. The limitation of valve motion was revealed on echocardiography. We performed emergency reoperation with thrombectomy and prosthetic valve replacement. The patient had anuncomplicated postoperative course and have been followed up. 최근에 본원에서 혈전증에 의한 급성 인공판막기능부전 1례를 치험하였기에 보고한다. 환자는39세 남자로서 내원 3일전부터 호흡곤란과 기 좌호흡을 호소하였다. 과거력 상 인공판막대치술 후 의사의 충고에도 불구하고 최근 4개월 동안 항응고제를 복용하지 않았다. 심초음파검사상 인공판막 판엽의 움직임에 제한이 있었다. 우리는 응급으로 혈전제거술과 인공판막 재치환술을 시행하였다. 수술 후 환자는 특별한 합병증없이 추적 관찰중에 있다.
수중재활운동이 뇌졸중 환자의 신체구성, 체력 및 호흡순환기능 요소에 미치는 영향
이재덕(Lee Jae-Deok),이형국(Lee Hyung-Kook) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.3
The purpose of this study was to examine the effect of aquatic rehabilitation exercise on body composition, physical fitness and cardiorespiratory function profiles of stroke patients. 13 patients completed the exercise program for six months, and then the effect of exercise program was measured and analyzed. First, in body composition profiles , percent body fat was significantly decreased(p<.05). Percent abdominal fat was decreased, while basal metabolic rates was increased, but there were no significant differences. Second, in physical fitness profiles, grip strength was significantly increased(p<.001) and back muscle strength was slightly increased but there was no significant difference. Cardiovascular endurance was increased but there were no significant differences. Balance ability(blind stork stand) and flexibility(sitting trunk flection) were significantly increased(respectively p<.05, p<.01). Third, in cardiorespiratory function profiles, vital capacity was significantly increased(p<.05), systolic and diastolic blood pressure were decreased but there were no significant differences. In conclusion, aquatic rehabilitation exercise for six months improved %body fat, promoted and maintained at least physical fitness and cardiorespiratory function of stroke patients. Therefore, it is necessary for stroke patient to regularly execute aquatic rehabilitation exercise.
우주 환경 노화 영향성에 따른 CFRP 물성 거동에 대한 연구
강덕수(Kang Deok Soo),정화영(Jung Hwa Young),이재은(Lee Jae Eun),윤지현(Yun Ji Hyeon),최혜윤(Choi Hye Yoon),이재덕(Jae Duk Lee),이동우(Dong Woo Yi),김세영(Se Young Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.06
최근 항공우주 및 전자산업용 고성능 재료로 사용하기 위해 높은 열안정성과 낮은 기체방출 특성을 갖는 재료가 요구되어 왔다. 탄소섬유강화 고분자(CFRP) 복합재료는 고분자 매트릭스 내에 탄소섬유를 강화제로 결합된 복합재료(CFRP)가 활용되고 있다. 이러한 변화에 따라 항공우주 분야에서 인공위성 구조체의 주재료는 알루미늄에서 복합재료로 변화하였다. 우주환경 고온/고진공에서는 금속보다 고성능으로 평가되고 있는 CFRP 가 사용된다. 기존에 범용적으로 사용되는 고강도 재료와는 달리 우주환경의 고진공, 원자산소, 자외선, 열사이클, 미소유성체 및 우주 파편물에 의한 충격 등 지상환경에서는 발생하지 않은 치명적인 요소로 인하여 재료의 물성 변화 및 저하에 따른 검증이 요구되고 있어, 고강성/저 열팽창 복합재료의 검증이 필요하다. 본 연구에서는 우주환경에서의 복합재료 물성 신뢰성를 검증하고자 탄소섬유/수지 조합을 통한 CFRP의 우주환경 노화 영향성에 따른 물성 거동 및 변화에 대한 연구를 진행하였다. Recently, materials having high thermal stability and low outgassing characteristics have been required to be used as high-performance materials for the aerospace and electronics industries. Carbon fiber reinforced polymer (CFRP) composite material is a carbon fiber bonded to a reinforcing agent in a polymer matrix. According to these changes, the main material of satellite structures in the aerospace field has changed from aluminum to composite materials. CFRP, which is evaluated as higher performance than metal, is used in high temperature and high vacuum in the space environment. Unlike conventional high-strength materials, the material properties change and deteriorate due to deadly factors such as high vacuum in the space environment, atomic oxygen, ultraviolet rays, thermal cycles, impacts from microscopic planets and space debris. Verification is required. High strength/low thermal expansion composite materials need to be verified. In this study, in order to verify the reliability of the physical properties of composite materials, a study on the physical properties behavior and changes according to the effect of aging in the space environment of CFRP was conducted through a carbon fiber/resin combination.