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운동이 비만 여성의 심근산소소비량과 심전도 QTc 간격에 미치는 영향
이혁종,박윤정,김용권,한구석,진영수 대한스포츠의학회 1999 대한스포츠의학회지 Vol.17 No.1
The purpose of this study was to investigate the effects of exercise staining on MVO_2 and electrocardiogram QTc interval in obese woman and to propose the desirable method for weight loss. Subjects were fifteen obese women for this study. 8 subjects were prolonged QTc interval group and 7 subjects were normal QTc interval. They participated in exercise program consisted of aerobic exercise and weight training exercise at A Medical Center. The body composition including Boyd Weight, BMI, WHR and % Body Fat was measured. The resting and exercise(Bruce protocol 7th min) rate-pressure product(RPP) could be measured with HR and systolic BP for MVO_2 measurement. The electrocardiogram QTc interval was calculated with Bazzett's formula using automated software program. The measured data of this study were as follows: 1) After participating the exercise program consisted of aerobic exercise and weight training exercise, Body Weight, BMI, WHR and % Body Fat were significantly changed in two groups. (p<.05). 2. After participating in the exercise program consisted of aerobic exercise and weight training exercise, the resting and exercise MVO_2 using RPP were significantly changed in two groups(p<.05). 3) After participating in the exercise program consisted of aerobic exercise and weight training exercise, the electrocardiogram QTc interval were decreased but were not significantly changed in prolonged QTc interval group. (p<.29). However, it was significantly decreased in prolonged QTc interval(p<.00).
Effect of Surface Modification on Biomechanical Properties of Titanium Alloy Ti6Al4V
( Suk Ku Han ),( Yoon Jong Chang ),( Yong Sik Kim ),( Jae Young Lee ),( Young Wook Lim ) 한국조직공학과 재생의학회 2010 조직공학과 재생의학 Vol.7 No.3
A satisfactory clinical outcome in cementless total hip arthroplasty depends on the primary stability for rapid osseointegration. While the geometric design of an implant contributes to mechanical stability, the nature of the implant surface itself is also of critical importance. The purpose of this study is to compare implant osseointegration with the following surface modifications made to the titanium alloy Ti6Al4V: machined, grit-blasted, sandblasted and acid etched (SLA), and micro-arc oxidation (MAO). Cylindrical Ti6Al4V implants of the same geometry but with the four different surfaces were tested in vivo in a beagle dog model (femur). The implant - bone shear strength was evaluated by push-out tests undertaken at 24 weeks after insertion into the femur, and the four different Ti6Al4V surfaces were examined histomorphometrically. All the Ti6Al4V implants were well integrated at the time of sacrifice. X-rays revealed that there was no osteoporosis, bone resorption, or osteolysis around the implant. The mean bone-to-implant contact percentages were 22.1±3.8% for the machined group, 52.7±3.7% for the grit-blasted group, 61.3±5.0% for the SLA group, and 64.5±3.2% for the MAO group. The mean bone-to-implant contact percentages were statistically significant between the machined group compared to the grit-blasted, SLA, and MAO groups. The variation in the interfacial shear strength was statistically significant differences between the machined group compared to the SLA, and MAO groups, and the grit-blasted compared to the MAO group. The results of the mechanical testing indicated that the MAO and SLA surface treatments have the potential to enhance peri-implant bone healing.
Micronesia, Chuuk Lagoon에 서식하는 파랑돔(Pomacentrus coelestis)의 생식년주기
김한준 ( Han-jun Kim ),한정훈 ( Jeonghoon Han ),허성표 ( Sung-pyo Hur ),이균우 ( Kyun-woo Lee ),최영웅 ( Young-ung Choi ) 한국수산과학회(구 한국수산학회) 2021 한국수산과학회지 Vol.54 No.2
This study was conducted to investigate the reproductive characteristics of the Neon damselfish Pomacentrus coelestis in Chuuk lagoon (7°27′ N, 151°53′ E), Micronesia, Equatorial Pacific Ocean. The specimens used in this study were collected from August 2009 to September 2010 from around the coral reef area at a depth of 3-10 m in the northwest coast of Weno Island. Overall, 228 individuals were collected over 14 months from this area, of which 115 were females and 108 were males. Among 108 males, 30 were found to be hermaphrodites and the sex of 5 individuals could not be determined. The overall sex ratio was approximately 1.06:1 (female:male), and the ratio of sexually active individuals was 0.79:1. The gonadosomatic index (GSI) fluctuated and showed the highest value of 8.43±1.21 in December 2009 and the lowest value of 3.36±0.71 in September 2009 in sexually active females. Males showed the highest GSI value of 2.64±0.93 in June 2010 and the lowest value of 0.35±0.06 in July 2010. Based on the fluctuation of GSI, the trends in the appearance of monthly sexually active individuals, and biopsy of the gonads, P. coelestis was found to be a hermaphrodite species of protogynous type and is considered to be reproductively active throughout the year.
한석구 ( Suk Ku Han ) 대한고관절학회 2013 Hip and Pelvis Vol.25 No.4
금속-금속 관절면 인공관절물은 마모가 적고 골두 크기가 크기때문에 관절의 안정성이 있다는 장점이 있으며 마모기전, 마찰학, 윤활기전 및 발생하는 마모입자 등에 금속-폴리에틸렌 관절면 인공고관절 치환물과 차이가 있다. 2세대 금속-금속 관절면 인공고관절 전치환술의 중, 장기적 임상결과는 우수 하다고 알려져 있으나 마모된 금속입자와 금속이온이 국소적 및 전신적으로 미치는 여러 부정적 영향에 대한 가능성은 아직 해결되지 않은 숙제로 남아 있다. 최근 금속 마모입자와 금속이온에 의한 연부 조직 반응이 큰 문제가 되었고, 일부 표면 관절치환 인공관절물의 높은 재치환율이 보고되면서 퇴출되는 사태까지 초래되었다. 이에 저자는 금속-금속 관절면 인공관절의 역사, 마찰학(tribology), 금속 마모입자 및 금속이온의 생물학적 영향 및 금속-금속 관절면 고관절 전치환술의 임상적 결과 및 최근 이슈가 되고 있는 금속-금속 관절면표면 관절치환술의 현황 등을 고찰하고자 한다. Metal-on-metal (MoM) total hip replacement (THR) and hip resurfacing have an advantage of low wear rate and greater stability by larger head size and different characteristics of wear mechanism, tribology, lubrication or generating wear debris compared to conventional metal-on-polyethylene THR. Although the mid- or long term clinical reports of second generation MoM THR were excellent, concerns about local and systemic effect by metal particles or metal ions were remained. Recently, reports have emerged of abnormal soft-tissue reactions to metal particles or metal ions and some hip resurfacing implants were expelled from the market due to high revision rate. This article includes the history of MoM THR, tribology, the biologic effect of metal particles and ions, the clinical results of MoM THR and the issues regarding the problems associated with hip resurfacing.
한성숙 ( Sung Suk Han ),김중호 ( Joong Ho Kim ),구인회 ( In Hoe Ku ),홍석영 ( Suk Young Hong ),이경상 ( Kyung Sang Lee ) 한국의료윤리학회 2005 한국의료윤리학회지 Vol.8 No.2
In Korea, the existence of clear guidelines on DNR(Do Not Resuscitate) has been insufficient. Generally, the procedure is done after assigned doctors and family members subjectively make decisions on DNR. Also, because patients who need DNR have been receiving the procedure inconsistently, the need for clear DNR guidelines is increasing. Through the research, the main purpose is to develop the guidelines. As the first step of the research procedure, various documentary records and DNR related database were used as references. Secondly, based on the reference, the first draft of DNR guidelines that can be applied to hospital settings was created by our researchers. On the next step, a group of professional experts was invited to review the first draft and rectify any controversial contents. To be specific, the guideline proposal was reviewed and corrected by professionals (doctors, philosophers, lawyers, etc) through 2 meetings by Delphi method. Finally, the draft was sent to Hospital Ethics Committee for a delicate examination. As a result, our guideline draft was ethically and legally acceptable according to the committee. Moreover, ethical issues were examined and discussed to provide deep understanding on the guideline draft.