Influential factors on the level of spalling in fire exposed concrete

한동엽 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6

The aim of this research is investigating the influential factors governing the level of concrete spalling at a material level. Fromthe former research on concrete spalling under the fire conditions, many available mechanisms have been provided andrecently, the spalling damage of concrete has been explained as a result of high inner pressure due to the evaporation of thewater in concrete microstructure. Based on the spalling mechanism, this study prepared various concrete specimens made withdifferent water-to-binder ratios, air contents, moisture contents, aggregate sizes, aggregate types and supplementarycementitious material (SCM) to investigate the governing factors on spalling of concrete. From the investigation, the factorswhich can cause pore connectivity, easiness of cracking, and moisture content of the concrete microstructure were governingfactors on spalling damage. Therefore, in this research, based on the results of the investigation it was possible to providecritical factors on spalling damage of the concrete, and it is expected that the data obtained from this study can provide usefulinformation for the design of fire resistant concrete.

Recent Progress in the Discovery of Bioactive Components from Edible Natural Sources with Antithrombotic Activity

한동엽,배종섭 한국식품영양과학회 2019 Journal of medicinal food Vol.22 No.2

Cardiovascular disease (CVD)-associated thrombosis are the most threatening cause of death worldwide. To resolve this crisis, efforts must be made to discover antithrombotic compounds for development of therapeutic agents with novel mechanisms of action, higher efficacy, and less adverse effects. It might also impact on the development of nutraceuticals to ameliorate vascular disease, and the development of appropriate diets to prevent CVDs. Recently, the research on antithrombotic compounds from edible natural sources increased swiftly by demand, and there has been remarkable progress. This review article covers bioactive components with antithrombotic activity that have been investigated in recent 5 years, more focused on the chemical structure classification (phenolics, polysaccharides, peptides, terpenes, and so on) and their original natural sources (traditional medicines, plants, animals, and foods).

특이적 코어 안정화 운동이 청소년 골프 선수들의 동적균형 Limits Of Stability(LOS)와 스윙관련 등속성 근기능에 미치는 효과

한동엽,정한상,이민기 한국스포츠학회 2021 한국스포츠학회지 Vol.19 No.2

본 연구의 목적은 특이적 코어 밸러스 트레이닝이 골프선수의 동적 균형 능력과 스윙관련 등속성 근기능에 미치는 효과를 검증하고자 실시하였다. 연구대상은 특이적 코어 밸러스 트레이닝 참여그룹 8명과, 비침여 그룹 8명을 선정하였 다. 트레이닝 참여그룹은 12주간 특이적 코어 밸런스 트레이닝을 실시하였으며, 그 결과는 다음과 같다. 첫째, 특이적 코어 안정화운동 프로그램을 실시한 운동그룹의 경우 트레이닝 전후에 따라서 하측(D)과 하우측(DR) 균형능력을 제외 한 자세 모두에서 양적인 증가를 나타냈다. 둘째, 동적 균형능력의 차이는 상측(U), 하측(D), 하우측(DR) 외 모든 자세에 서 차이를 나타내었으며, 전체 스코어는 운동그룹이 비교그룹에 비해 통계적으로 유의하게 증가한 것으로 나타났다. 셋 째, 특이적 코어 안정화운동 프로그램을 실시한 운동그룹은 훈련 전후에 따라서 요부신근을 제외한 근력이 향상된 것으로 나타났다. 넷째, 스윙관련 등속성 근력에 대한 집단 간의 차이 결과는 우측 무릎 및 요부 신근을 제외하고 모든 근력에서 향상된 결과를 나타냈다. 이러한 결과를 종합해 볼 때, 청소년 골프선수들의 특이적 코어 안정화 운동은 동적균형능력향상 에 영향을 미치는 것으로 생각되며, 골프 경기력에 영향을 미치는 근력변인들의 향상에 도움이 될 것으로 판단된다. The purpose of this study was to verify the effect of specific core balance training on dynamic balance ability and swing-related isokinetic muscle function of golf players. For the study, 8 participants in the specific core balance training group and 8 non-invasive groups were selected. The training participation group conducted specific core balance training for 12 weeks, and the results are as follows. First, in the case of the exercise group that performed the specific core stabilization exercise program, both postures except for the lower (D) and lower right (DR) balance abilities showed a quantitative increase before and after training. Second, the difference in dynamic balance ability showed differences in all postures except for the upper (U), lower (D), and lower right (DR), and the overall score was statistically significantly increased in the exercise group compared to the comparison group.Third, it was found that the exercise group that performed a specific core stabilization exercise program improved muscle strength except lumbar extensors before and after training. Fourth, the difference between groups for swing-related isokinetic muscle strength showed improved results in all muscle strength except for the right knee and lumbar extensor.

살풀이춤 연구 재고: 한영숙류 살풀이춤을 중심으로

한동엽,조남규 한국무용과학회 2019 한국무용과학회지 Vol.36 No.4

This study attempts critical introspection on the Oriental Thoughts of nature consolidate and esthetic sense of masculine·feminine which have been discussed to interpret the Salpuri dance for aiming to suggest a new perspective on future research on Salpuri dance. Salpuri dance has been considered one of the representative traditional dances of Korea; it is actively carried on and meanwhile, it has drawn attention as a subject of research on traditional culture. As the preceeding studies accumulates, it was an important achievement to try to understand Salpuri dance by the essence of Oriental philosophy aiming unity because of that it has become possible to grasp the reasons for their own existence. But the focus is on the unity itself, so that no discussion was made about the orientation and interaction of individual entities and the nature of the Salpuri dance was not fully captured on which express it’s philosophical reasons in the language of dance. Also, it is problematic to use the concepts of ‘masculine·feminine’ without redefinition to interpret the esthetic sense of Salpuri dance. This paper noted the process of separation and confrontation which can be grasped by itself on the process of reunification based on this point of view. There is an active side being establish the self image of subject not just recognition of objects in the relationship through the process of separation and confrontation on Salpuri dance which realize the denial and acceptance, the bond and the unraveling on the silk towel expressing one’s misfortune. On this basis, This paper analyzed Han Young Suk’s Salpuri dance as sublime beauty of seeker of truth by unraveling the process of philosophical introspection in the language of dance. On the other hand, pointed out the problem of the term ‘masculine・feminine’through critic and proposed an alternative term: tension and relaxation gap. Salpuri dance has its own vitality, so that it is our task to present a unified image and reinterpret it through today’s values. 이 연구는 향후 살풀이춤 연구에 새로운 관점을 제안하기 위한 목적으로 그동안 살풀이춤을 해석하기 위해 논의되어온 자연 합일적 동양 사상과 남성적·여성적 미감에 대한 비판적 성찰을 시도한다. 살풀이춤은 한국의 대표적인 전통춤으로 손꼽히며 유파별로 활발하게 전승되는 한편 전통문화연구의 대상으로서 주목받아왔다. 선행연구가 누적되면서 합일을 지향하는 동양철학의 본질을 통해 살풀이춤을 이해하고자 한 시도는 고유의 사유를 파악할 수 있게 한다는 점에서 중요한 성과였다. 하지만 합일로의 귀결 자체에만 초점이 맞추어지면서 개별 주체의 지향과 상호작용에 대한 논의가 이루어지지 않았으며 철학적 사유를 춤의 언어로 표출한다는 살풀이춤의 성격이 온전히 포착되지 못했다. 한편 살풀이춤의 미감을 해석하기 위해 ‘남성적·여성적’이라는 용어가 재정의 없이 무비판적으로 사용되었다는 점 또한 문제적이다. 본고는 이러한 문제의식에서 출발하여 합일로 나아가는 과정에서 주체적으로 파악할 수 있는 분리와 대립의 과정에 주목했다. 살을 표상하는 명주 수건에 대한 부정과 수용, 맺음과 풀림을 구현하는 살풀이춤에는 분리와 대립의 과정을 거치며 객체와의 관계 속에서 객체에 대한 인식뿐만 아니라 주체 자신의 자아상이 재확립되어가는 능동적인 면이 녹아있음을 분석하였다. 이를 바탕으로 한영숙의 살풀이춤이 철학적 성찰의 과정 자체를 춤의 언어로 풀어냄으로써 구도자적인 숭고미를 자아낸다고 보았다. 한편 기존에 논의되어온 살풀이춤의 미감을 비판적으로 검토한 후 그에 대한 대안으로 긴장과 이완의 격차라는 관점에서 살폈다. 살풀이춤은 생명력을 지닌 존재라는 점에서 앞으로의 과제는 살풀이춤에 대한 하나의 통일된 상(像)을 제시하는 것과 오늘날의 가치를 통해 살풀이춤을 재해석하는 것이다.

Use of Recycled Aggregate as Alkali Activator to Enhance Strength Development in High-Volume Blast-Furnace Slag Concrete

한동엽,김준호,한민철,이성태 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.3

The aim of the research is to achieve the strength development performance of high-volume slag concrete or zero-cement concrete with 0.45 of W/B by incorporating of recycled aggregates as a cost-effective alkali activator. Based on the blast-furnace slag (BFS) based cement, like an alkali activated slag (AAS), recycled aggregates were replaced by natural aggregates and were used as an alkali activator for BFS. For compressive strength improvement in concrete, different replacement ratios of ordinary Portland cement ranged from zero to 50%, recycled fine aggregates (RFA) and recycled coarse aggregates (RCA) ranged from zero to 100% were varied. The test results indicated that recycled aggregates could be used as an alkali activator for BFS, and they were also able to help achieve about 90% of compressive strength of the concrete with natural aggregate depending on its optimum proportion with BFS.

정상 성인 남성에서 연령증가에 따른 배뇨형태의 변화

한동엽,김종성,임정식 大韓泌尿器科學會 2001 Korean Journal of Urology Vol.42 No.12

[유기성 자원화] 병합전처리 방법을 이용한 산발효에서의 HRT에 관한 연구

한동엽,엄태규 한국폐기물자원순환학회 2004 한국폐기물자원순환학회 학술대회 Vol.2004 No.1

비만이 복강경하 근치적 신적출술에 미치는 영향

한동엽,오상진,서일영,임정식 대한비뇨의학회 2007 Investigative and Clinical Urology Vol.48 No.8

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.

상대 방사 정규화를 이용한 다시기 적외 위성영상의 변화탐지 비교

한동엽,송정헌,변영기 대한원격탐사학회 2017 大韓遠隔探査學會誌 Vol.33 No.6

KOMPSAT-3A 위성은 기존의 지구관측 위성에 비하여 고해상도의 MWIR 영상을 하루 2번 취득한다. 기존 SWIR 영상이나 TIR 영상과 다른 특성으로 인하여 새로운 지표면 방사 정보를 제공할 수 있다. 본 연구에서는 KOMPSAT-3A MWIR 위성영상의 특성을 살펴보기 위하여 다시기 차이 영상을 생성하여 기존 적외 영상과 비교하였다. IR 영상의 전처리 과정으로 영상 상대보정을 수행하고, PIFs(Pseudo Invariant Features) 화소기반의 상대방사 보정을 수행하여 화소값의 차이를 최소화시켰다. Sentinel-2 SWIR 영상, Landsat 8 TIR 영상과 KOMPSAT-3A MWIR 영상을 실험한 결과, KOMPSAT-3A 차이 영상에서 인공지물의 구별이 두드러짐을 확인할 수 있었다. 이러한 IR영상의 특성을 이용하여 향후 KOMPSAT-3A MWIR 영상의 활용도를 높일 수 있을 것으로 여겨진다. The KOMPSAT-3A satellite acquires high-resolution MWIR images twice a day compared to conventional Earth observing satellites. New radiometric information of Earth’s surface can be provided due to different characteristics from existing SWIR images or TIR images. In this study, the difference image of multitemporal images was generated and compared with existing infrared images to find the characteristics of KOMPSAT-3A MWIR satellite images. A co-registration was performed and the difference between pixel values was minimized by using PIFs (Pseudo Invariant Features) pixel-based relative normalization. The experiment using Sentinel-2 SWIR image, Landsat 8 TIR image, and KOMPSAT-3A MWIR image showed that the distinction between artifacts in the difference image of KOMPSAT-3A is prominent. It is believed that the utilization of KOMPSAT-3A MWIR images can be improved by using the characteristics of IR image.