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아킬레스건이 노출된 족관절 연부조직 결손에 대한 역행성 표재 비복동맥 피판술
최영락,이승용,이순철,이호재,한수홍,Choi, Young-Rak,Lee, Seung-Yong,Lee, Soon-Chul,Lee, Ho-Jae,Han, Soo-Hong 대한미세수술학회 2012 Archives of reconstructive microsurgery Vol.21 No.2
Purpose: Soft tissue defect on posterior side of heel exposing Achilles tendon is vulnerable and require thin flap to improve aesthetic and functional results. Reverse superficial sural artery flap is simple and fast procedure, and it can preserves major arteries, supplies reliable constant blood, causes less donor site complication. Authors reviewed our cases and report the clinical results. Materials and Methods: Nine cases of soft tissue defects on the posterior side of heel exposing Achilles tendon were treated with distally based superficial sural artery flap. There were 6 male and 3 female and mean age was 48.4 years. The size of flap was from $4{\times}4cm$ to $10{\times}15cm$ and mean follow-up period was 23 months. Flap survival, postoperative complications were evaluated. Results: All flaps were survived completely without necrosis. There was one case of partial wound dehiscence that needed debridement and repair, and other one case had recurrent discharge that was healed after removal of calcaneal plate. All patient showed acceptable range of ankle motion. Conclusion: Authors suggest that the reverse superficial sural artery flap could be one of the useful treatment options for the soft tissue defect on posterior side of heel exposing Achilles tendon.
Reliability of Muscle Evaluation with a Tactile Sensor System
오영락,이동주,김성환,김미은,김기석,Oh, Young-Rak,Lee, Dong-Ju,Kim, Sung-Hwan,Kim, Mee-Eun,Kim, Ki-Suk Korean Academy of Orofacial Pain and Oral Medicine 2005 Journal of Oral Medicine and Pain Vol.30 No.3
A tactile sensor employs a piezoelectric element to detect contact frequency shifts and thereby measure the stiffness or softness of material such as tissue, which allows the sensor to be used in many fields of research for urology, cardiology, gynecology, sports medicine and caner detection and especially for cosmetics and skin care. In this study, reliability of the tactile sensor system was investigated with its manual application to the muscles susceptible to temporomandibular disorders. Stiffness and elasticity of anterior temporalis, masseter and trapezius muscles were calibrated bilaterally from 5 healthy men with an average of 24.5$\pm$0.94 years. The tactile sensor used in this study had a computer-controlled and motor-driven sensor unit which automatically pressed down on the skin surface over the muscles being measured and retracted, thereby providing the hysteresis curve. The slope of the tangent of the hysteresis curve (${\Delta}f/{\Delta}x$) is defined as stiffness of the muscle being measured and the distance between the two parts of the curve as its elasticity. To determine inter-examiner reliability, all the measurements were performed by the two examiners A and B, respectively and the same examination were repeated with an interval of 2 days for intra-examiner reliability. The results from this study demonstrated high reliability in measuring stiffness and elasticity of anterior temporalis, masseter and upper trapezius muscles using a tactile sensor system. It is suggested that the tactile sensor system can be a highly reproducible and effective instrument for quantitative evaluation of the muscle in head and neck region.
개폐식 대공간 구조물의 효율적인 지진응답제어를 위한 TMD의 최적 설치 위치 분석
이영락,김현수,강주원,Lee, Young-Rak,Kim, Hyun-Su,Kang, Joo-Won 한국공간구조학회 2018 한국공간구조학회지 Vol.18 No.2
In this study, TMD(Tuned Mass Damper) is installed in a retractable-roof spatial structure in order to investigate dynamic response characteristics according to mass ratio and installed position of TMD on large spatial structures. The example analytical model is generated based on the Singapore sports hub stadium. Twenty eight analytical models are used to investigate optimal installation position of TMD for the example retractable-roof spatial structure using 4 to 16 TMDs. The mass of one TMD is set up 1% of total mass at the example analytical model. Displacement response ratio of model with TMD is compared with that of base model without TMD. It has been found from numerical simulation that it is more effective to install TMD at the edge of the spatial structure rather than to concentrate the TMD at the center of the spatial structure.
과민성 대장증후군의 병인론에 대한 고찰: 생물정신사회 모델의 이해와 한계
최영락,이상익,김시경,Choi, Young-Rak,Lee, Sang-Ick,Kim, Sie-Kyeong 한국정신신체의학회 2005 정신신체의학 Vol.13 No.1
연구목적 : 저자는 과민성 대장증후군을 가진 환자들의 병인론에 대한 문헌고찰을 통해 과민성 대장증후군을 생물정신사회 모델로 이해하고 그 한계를 알아보고자 한다. 방법: 저자는 1977년부터 2003년까지의 과민성 대장증후군에 대해 Pub-Med와 Kisep에 등록된 문헌을 고찰하였다. 결과: 과민성 대장증후군은 단일 병인론으로 설명될 수 없으며, 생물정신사회 모델은 과민성 대장증후군의 이해에 대해 새로운 관점을 제공하였다. 과민성 대장증후군에서 생물정신사회 모델의 생물학적 요인, 정신적 요인, 사회적 요인들은 서로 상호 작용하고 있고 각기 다른 정도로 기여하며, 영향을 미치고 있다. 세 요인들은 과민성 대장증후군에서 증상의 형성, 악화. 지속에 영향을 미치고 있으며 병인론, 증상경과, 치료결과에 중요한 역할을 하고 있다. 그러나 세 요인들을 치료에 적용하는 데는 많은 어려움을 가지고 있다. 결론: 생물정신사회 모델은 과민성 대장증후군을 가진 환자들을 이해하는데 기여하였으나, 치료적 적용에는 한계를 보이고 있다. 생물정신사회 모델은 실재적인 활용에 많은 한계가 있으므로 생물정신사회적 관점에 대한 보다 진보된 연구가 필요할 것이다. Objectives The author aimed to investigate and understand the limitations of the biopsychosocial model for irritable bowel syndrome by reviewing the priorly reported etiologies in patients with irritable bowel syndrome(IBS). Methods The author reviewed all possible previous studies related to the investigation regarding IBS in the Pub-med & Kisep database from 1977 to 2003. Results : It was impossible that patients with IBS were diagnosed and traced to a single etiology. So, the biopsychosocial model was suggested to be a new paradigm for IBS. Biological, psychological and social factors are interplaying and contributing to the biopsychosocial model affecting each other, thus affecting the biopsychosocial model. Three factors were necessary for understanding the etiology, process of symptoms and clinical outcome of IBS by virtue of their key roles in the developing, precipitating and perpetuating of the illness. However, any treatment application for those three factors faces many obstacles to be overcome. Conclusion : The biopsychosocial model contributed relatively much to the explanation but little to the treatment application of patients with IBS. Therefore, because there seems to be little practical use at present, the author believes biopsychosocial aspects should be researched further.
상부 돔구조와 하부구조간의 고유진동수비에 따른 동적응답특성
이영락,김광일,강주원,Lee, Young-Rak,Kim, Kwang-Il,Kang, Joo-Won 한국공간구조학회 2015 한국공간구조학회지 Vol.15 No.2
This study investigate the dynamic response changes of rib dome structure according to property changes of Substructure. Eigenvalue analysis is conducted in first natural frequency of rib dome versus substructure and searched in the dominant mode of horizontal and vertical direction. Resonance frequency by each first natural frequency of the rib dome structure, substructure and total structure is applied for a seismic wave. That is analyzed about maximum displacement response ratio and maximum acceleration response ratio.
TMD 설치 질량 변화에 따른 대공간 구조물과 고층건물의 변위 응답 특성
이영락,김현수,강주원,Lee, Young-Rak,Kim, Hyun-Su,Kang, Joo-Won 한국공간구조학회 2020 한국공간구조학회지 Vol.20 No.3
In this paper, the displacement response to seismic loads was analyzed after installing TMD in spatial structures and high-rise buildings. In the case of a spatial structures, since it exhibits complex dynamic behavior under the influence of various vibration modes, it is not possible to effectively control the seismic response by installing only one TMD, unlike ordinary structures. Therefore, after installing eight TMDs in the structure, the correlation between displacement response and mass ratio was examined while changing the mass. The TMD must be designed to have the same frequency as the structure frequency so that the maximum response reduction effect can be exhibited. It can be confirmed that the most important variable is to select the optimal TMD mass in order to install the TMD on the structure and secure excellent control performance against the earthquake load. As a result of analyzing the TMD mass ratio, in the case of high-rise buildings, a mass ratio of 0.4% to 0.6% is preferable. In spatial structures, it is desirable to select a mass ratio of 0.1% to 0.2%. Because this study is based on the theoretical study based on numerical analysis, in order to design a TMD for a real structure, it is necessary to select within a range that does not affect the safety of the structure.