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섬유보강 콘크리트의 내화도에 따른 압축강도의 특성에 관한 연구
김민국,최진석,조철희,조창호,손순채,김정섭 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
This paper is a experimental study to understand the properties of compressive strength according to fire resistance of fiber reinforced concrete mixed with fiber reinforcement. The materials for fiber reinforcement are polypropylene fiber, steel fiber, and cellulose fiber, a natural fiber. Destructive and non-destructive test are conducted to compute the material age classified compressive strength of each reinforced fiber. Fire resistance experiment was conducted by destructive and non-destructive experiment after fire resistance experiments at 300, 600, and 900 degree on 180 days material aged specimen. The conclusions generated by the experiment of compressive strength and fiber resistance according to the material ages of the concrete which is fiber reinforced are as follows: 1) Fiber reinforced concrete presented low strength compared with non-reinforced one from destructive compressive strength test. 2) Fiber reinforced concrete except cellulose fiber generally presented a little bit low strength compared with non-reinforced one from non-destructive compressive strength test. 3) Steel fiber rose 7.8% polypropylene fiber rose 3.2% and sellulose fiber rose 30.5% compared with non-reinforced concrete at 300 degree from destructive compressive strength experiment after fire resistence experiment. Cellulose fiber reinforced concrete was appeared most excellent in fire resistence as 23.6% higher strenth than any other fiber reinforced concrete. 4) Cellylose fiber reinforced conctete rose 14.6% compared with fiber non-reinforced concrete from the non-destructive compressive strength experiment after fire resistence experiment at 300 degree.
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수재해 취약성 지수(WDVI) 개발 및 아시아 몬순지역 수재해 취약성 평가
김민국,김정배,배덕효 한국방재학회 2018 한국방재학회논문집 Vol.18 No.7
The purpose of this study was to develop the Water Disaster Vulnerability Index (WDVI), which was applied to 30 countries located in the Asian monsoon region. For the development of the index, vulnerability was evaluated by sensitivity and exposure. Hydrological, meteorological, social, and economic data suitable for each classification were selected and used as indicators. To evaluate the flood damage vulnerabilities in the Asian monsoon region, the percentiles of the index results in 30 countries were compared, and to investigate the change in vulnerability due to climate change, the variation in the flood and drought vulnerability index was compared. The result of the WDVI evaluation showed that Southeast Asia had the highest index value and growth rates. In the case of drought vulnerability, the index values and growth rates were the highest in Central Asia, while in Southeast Asia, drought vulnerabilities were relatively low, but the index growth rate was the second highest in Asia. It was found that future climate change is expected to cause variation in precipitation characteristics and increase the flood and drought vulnerability. 본 연구에서는 수재해 취약성 지수를 개발하고, 아시아 몬순 지역의 30개 국가에 대해 적용 및 평가하고자 하였다. 지수 개발을 위해 민감도와 노출로 취약성을 구분하였으며, 각 구분에 적합한 수문⋅기상학적 자료와 사회⋅경제학적 자료를 선정하여 세부지표로 사용하였다. 각 국가별 취약성을 평가하기 위해 30개국가에대한 지수 산정결과 값의 백분위를 산정하여 비교하였으며, 기후변화에 따른 홍수 및 가뭄 취약성의 변화를 판단하기 위해 과거 관측자료를 활용하여 국가별 1960년 대비 2006년의 지수 변화율을 산정하였다. 평가 결과 홍수 취약성의 경우 동남아시아 지역에서 지수 값과 증가율이 가장 크게 나타났다. 가뭄 취약성의 경우 중앙아시아 지역에서 지수 값과 증가율이 가장 크게 나타났으며, 동남아시아 지역의 경우 가뭄 취약성은 비교적 적은 것으로 나타났으나 지수 증가율이 중앙아시아 다음으로 크게 나타났다. 이는 기후변화로 인한 강우 특성의 변화가 가져온 결과로 판단되며, 이로 인해 향후 수재해 취약성은 기후변화에 따라 점차 증가할 것으로 판단된다.
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김민국,변종은,이병국 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
In this paper, performance of rectangular shaped magnetic power pads for inductive power transfer (IPT) system according to ferrite structure is analyzed. In order to evaluate the influences of ferrite structure, six cases of magnetic power pads are proposed. Self-inductance, coupling coefficient, quality factor, and coil to coil efficiency are compared as the displacement increases in the direction of x or y axis. For accurate estimation, finite element method (FEM) simulation is used and loss components of the power pads are numerically calculated and considered. Through the simulation and measured results, effectiveness of protrusive and enveloping ferrite structure is identified.
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Effect of sugar alcohols on reverse self-assembly of lecithin
김민국,이희영 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Lecithin can form reverse spherical micelles in a variety of nonpolar solvents by the self-assembly of molecules. When certain additives such as water or bile salts are added to lecithin solution, reverse spherical micelles are transformed into reverse cylindrical micelles. The hydrogen bonds between the additives and phosphate groups in lecithin play a key role for the formation of the reverse cylindrical micelles. We replaced those additives with sugar alcohols such as D-sorbitol. As increasing the number of -OH groups in the sugar alcohols, the length of the reverse cylindrical micelles increases, resulting in the increase in the viscosity of the solutions. The lengths and radii of reverse cylindrical micelles were measured by small-angle-X-ray scattering (SAXS) and the rheological properties were studied by steady-shear and dynamic rheology. Fourier-transform infrared (FT-IR) was used to investigate the interactions such hydrogen bonds between lecithin and sugar alcohols.
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김민국,이승은,최준혁 대한영상의학회 2021 대한영상의학회지 Vol.82 No.1
Ewing sarcomas constitute a group of small, round, blue cell tumors of the bone and soft tissue. Extraskeletal Ewing sarcoma (EES) is a rare malignant neoplasm that arises from soft tissues, and it usually affects children and young adults. EES of the thoracopulmonary region commonly presents with a palpable mass or pain. Although rarely reported, EES affecting the anterior chest wall may present as a breast mass. We report a case of EES arising from the chest wall and manifesting as a palpable breast mass in a 22-year-old woman. The large mass was initially misdiagnosed as a breast origin mass on ultrasonography, but subsequent CT and MRI showed that the mass originated from the chest wall. Radiologists should be aware of the imaging findings of EES, and they should understand that chest wall lesions may be clinically confused as breast lesions.
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RPA 기술의 기업 실무 도입에 대한 엔지니어의 기술 저항 및 수용 요인 분석
김민국,박병호 한국경영정보학회 2019 한국경영정보학회 학술대회논문집 Vol.2019 No.11
RPA 기술에 대한 각 기업의 투자가 실효성을 가지기 위해서는 기술 자체도 중요하지만 기술을 도입해야 하는 엔지니어들의 적극적이며 자발적인 참여가 무엇보다 중요하다. 본 연구는 RPA 기술을 기업 실무에 도입하고자 하는 기업의 경영진이 엔지니어의 자발적 참여를 유도하기 위해서 어떤 요인에 대해 집중적인 관리를 해야 하는지에 대해서 연구하고자 한다. 이를 위해, 기술수용모형과 혁신저항이론을 접목하여 13개의 가설을 기반으로 연구모형을 개발하였으며, 설문조사를 통해 EPC 업계에 근무중인 실무자를 대상으로 하여 총 211개의 데이터를 확보하였다. AMOS를 통해 데이터를 분석한 결과, RPA 기술 개발에 참여하고자 하는 의사에 대해 개인의 혁신성, 직무 적합성, 상대적 이점을 부각시켜 기술 수용성을 높이는 것은 긍정적인 영향을 미치는 것으로 나타났으나, 직업에 대한 불안감을 해소하여 혁신에 대한 저항을 줄여주더라도 기술 개발에 대한 참여에 긍정적인 영향을 준다고 보기는 어렵다는 결과가 나타났다.
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