Bioprosthesis in the Mitral Position: Bovine Pericardial versus Porcine Xenograft

한동엽,박성준,김호진,정성호,추석정,정철현,이재원,김준범 대한흉부외과학회 2022 Journal of Chest Surgery (J Chest Surg) Vol.55 No.1

Background: While the use of bioprosthetic valves for mitral valve replacement (MVR) is increasing, very few studies have compared bovine pericardial and porcine valves in the mitral position to help guide bioprosthetic selection. Methods: In the present study, patients who underwent MVR using bovine pericardi- al valves were compared with those who underwent MVR with porcine bioprostheses between January 1996 and July 2018. Those with prior MVR, infective endocarditis, con- genital mitral valve disease, or ischemic mitral regurgitation were excluded. The primary outcomes were structural valve deterioration (SVD) and mitral valve reoperation from any cause, and death was regarded as a competing risk. Competing risk analysis and propensi- ty score-matching were used for comparisons. Results: Among the 388 patients enrolled, pericardial and porcine bioprostheses were implanted in 217 (55.9%) and 171 (44.1%), respectively. Propensity score-matching yield- ed 122 pairs of patients that were well-balanced for all baseline covariates. No significant differences were observed between the groups in unadjusted (p=0.09) and adjusted overall survival (hazard ratio [HR], 1.13; 95% confidence interval [CI], 0.72–1.76; p=0.60). Competing risk analysis revealed no significant differences in the risks of mitral reoperation (HR, 1.07; 95% CI, 0.50–2.27; p=0.86) and development of SVD (HR, 1.57; 95% CI, 0.56–4.36; p=0.39) between the groups. Matched population analysis confirmed similar results re- garding reoperation (HR, 0.99; 95% CI, 0.40–3.22; p=0.98) and SVD (HR, 1.39; 95% CI, 0.41– 4.73; p=0.60). Conclusion: No significant differences in survival or valve durability were observed be- tween bovine pericardial and porcine bioprosthetic MVR. These findings require further validation through studies with larger sample sizes.

하수슬러지의 열처리, 초음파 및 산-알칼리 병합처리에 따른 산발효 성능비교

한동엽,엄태규 대한환경공학회 2004 대한환경공학회 학술발표논문집 Vol.2004 No.12

Fluidity of slag cement paste depending on types and replacement ratios of gypsum

한동엽,이준철,이준영 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.2

The aim of this research is evaluating the flow behavior of slag cement paste depending on various types of gypsum and theirreplacement ratio. In this research, gypsum was added for the slag cement to induce ettringite formation and thus achieveimproved and stable strength. Although natural anhydrite gypsum is primarily used for this purpose, various other types ofgypsum have been studied as potential additives for slag cement. However, these studies have focused on the reactionmechanisms or hardened properties. Hence, in this research, using workability measurement methods and a rheological testmethod, six-different types of gypsum were evaluated: anhydrite, α, and β hemihydrate, dihydrate, desulfurized gypsums andcombined gypsum of desulfurized and anhydrite gypsums. Experiment results showed that the dissolution rate of differentgypsums can significantly influence the fluidity of the pastes.

고로슬래그 미분말 다량치환 콘크리트의 탄산화 억제를 위한 기밀성 향상재 부착효과

한동엽,김경훈,한민철 한국건축시공학회 2015 한국건축시공학회지 Vol.15 No.1

The goal of this research was evaluating and suggesting the solution of preventing carbonation of concrete replacedhigh-volume of slag. The concrete mixtures were prepared with high-volume slag and recycled aggregate, and theconcrete samples were evaluated the carbonation depth with various surface treatment methods. For various surfacetreatment methods and surface protecting sheets, bonding strength and carbonation depth were measured. Basically,from the results, the carbonation of concrete was completely prevented with any type of surface treatment method andsurface protecting sheet as far as the surface treatment materials were remained. Therefore, in this research, it wasknown and suggested that the easiness of handling and sufficient bonding performance was much important than thequality of surface protecting sheets. 친환경 건설 재료의 일환으로 고로슬래그 미분말을 다량치환한 콘크리트에 대해 재생골재를 이용해 잠재수경성 반응을 활성화 시켜 콘크리트로서의 활용방안 모색과 탄산화를 저감시킬 목적으로 다양한 기밀성 향상재를 표면에 부착하여 탄산화 저감효과를 측정하였다. 재생골재의 사용은표면의 모르타르 및 미수화 시멘트로 인해 고로슬래그 미분말을 다량 치환한 콘크리트에 양호한 영향을 미친 것으로판단되었다. 콘크리트 표면의 기밀성 향상재에 따른 탄산화 저감 효과는 기밀성 향상재 종류와 상관없이 콘크리트표면에 효과적으로 부착되어 있는 경우라면 모두 양호한탄산화 저감 성능을 나타내었다. 그러므로 시공이 용이하고 취급이 간편하며 콘크리트 표면에서 장기간 양호한 내구성을 발휘하는 기밀성 향상재로 선시공 1중 에어캡이 가장양호한 방법으로 판단되었으며, 추가적으로 단열성능을 고려하였을 때에는 선시공 2중 에어캡이 효율적인 방법으로생각해 볼 수 있었다.

특이적 코어·밸런스 복합 트레이닝이 고등학교 야구선수의 균형관련 변인(동적,정적균형)과 구속 변화에 미치는 효과규명

한동엽 한국융합과학회 2023 한국융합과학회지 Vol.12 No.8

연구목적 연구의 목적은 특이적으로 고안된 코어운동과 밸런스운동이 복합된 형태의 운동프로그램을 개발하여, 중, 고등학교 야구선수들을 대상으로 균형 관련 변인과 구속 변화에 관하여 분석하고규명하는데 본 연구의 목적이 있다. 연구방법 본 연구의 목적을 달성하기 위해 청소년 야구 선수들을선발하여 4개월간 개발된 운동 프로그램을 적용하여 결과를 얻었다. 결과 정적균형능력의 변화는 운동프로그램 전과 후, 운동집단간의 좌, 우측에서 통계적으로 유의한 차이가 있었다. 동적균형능력에대한 집단 간 차이에서도 우측상부, 좌측상부, 우측, 좌측, 하부, 우측하부, 좌측하부 자세에서 통계적유의성을 보였다. 또한 비운동 집단에 비해 운동 참여 집단에서 전체 점수가 유의미하게 향상되는것으로 나타났다. 구속의 변화는 관찰되지 않았다. 결론 특이적으로 고안된 코어 밸런스 복합 트레이닝은 청소년 야구 선수들의 정적 균형 및 동적 균형 능력 향상에 도움이 된다고 할 수 있다 Purpose The purpose of this study is to analyze and identify balance-related variables and velocity changes for youth baseball players by developing a specially designed exercise program that combines core and balance exercises. Methods In order to achieve the purpose of this study, youth baseball players were selected, and the results were found by applying an exercise program developed for 4 months. Result As for the change in static balance ability, there was a statistically significant difference in the left and right sides of the exercise group before and after the exercise program. There was a significant improvement in the right, left, lower, lower right, and lower left postures. Even in the difference between the groups for dynamic balance ability, there was statistical significance in the upper right, upper left, right, left, lower, lower right, and lower left postures. A change appeared. In addition, it was found that the overall score was significantly improved in the exercise participation group compared to the non-exercise group. No change in ball speed was observed. Conclusion The specifically designed core balance complex training can be said to be helpful in improving static balance and dynamic balance ability for youth baseball playe

Layering Charged Polymers Enable Highly Integrated High-Capacity Battery Anodes

한동엽,한임경,김연수,류재건,박수진 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.2

SBR 에 있어서 포기방식에 의한 C , N , P 의 제거특성

한동엽,엄태규,박수묵 대한환경공학회 2001 대한환경공학회 학술발표논문집 Vol.2001 No.12

A Polymeric Separator Membrane with Chemoresistance and High Li-ion Flux for High-energy-density Lithium Metal Batteries

한동엽,류재건,박수진 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.2

Left Ventricular Enlargement Procedure in a Patient with Diffuse-Type Hypertrophic Cardiomyopathy: A Case Report

한동엽,박성준,정성호 대한흉부외과학회 2022 Journal of Chest Surgery (J Chest Surg) Vol.55 No.2

Surgical septal myectomy is the preferred treatment option for patients with medically intractable obstructive hypertrophic cardiomyopathy. Extended transaortic septal myectomy is a widely performed surgical procedure for patients with subaortic obstruction. The transapical approach may provide an alternative surgical option in less common phenotypes, such as apical hypertrophy or long-segmental septal hypertrophy. In this report, we describe a case of a procedure performed to achieve left ventricular enlargement procedure using a combined transaortic and transapical dual approach in a patient with diffuse- type hypertrophic cardiomyopathy with apical aneurysm and mid-cavity obstruction.

필(必)환경의 시대, 지속가능성을 지닌 가구디자인의 연대별 사례 분석을 통한 방향성 연구

한동엽,이정교 한국가구학회 2022 한국가구학회지 Vol.33 No.2

Currently, our life is showing a fast-consumerism with rapidly changing trends. In particular, although various types of furniture are being released, furniture that has been pushed out of the trend goes to landfills before they are used up. In this reality, design is sometimes seen as a form of inducing consumption by stimulating consumers’ purchase desires. So, it is time to emphasize the necessity of sustainable design and reconsider its value. Therefore, this study aid to examine how sustainability is progressing in the field of furniture design, and to consider the role of designers for circular economy and the direction of furniture design in the era where eco-frinedliness must be practiced. This study begins by redefining what sustainability is. And the characteristics are extrated through how the global interest in environmetal proctection has been linked to sustainable development. Through this, the researcher examines the potential of sustainable design. Based on this, various furniture design cases from the 1990s to the present are investigated. In conclusion, the researcher analyzes the characteristics of furniture design with sustainability for each age and derives keywords for the direction of sustainability. Through this, we expect that sustainable design will play a role in the future society.