• 복식
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• 제63권4호
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• pp.101-117
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• 2013

The purpose of this study is to consider the works of Nick Knight, the most influential fashion visual maker, to find out the characteristics of his works. For the research method, literature reviews were done by studying his book, viewing the articles on his official web site, reading journal review of his works and his interview articles. For the work analysis, fashion brands 'Christian Dior', 'Alexander McQueen', 'Martin Margiela', 'Hussein Chalayan' and 'Gareth Pugh' that have worked with Nick Knight were selected. The characteristics of his fashion works were derived from overall analysis of fashion visual works. The characteristics of Nick Knight's works are as follows. First is the 'innovation of image expression'. He used digital infra in advance and introduced digital images at the initial stage. He used fashion films as the means of communication and tried new image expressions in 3D. Second is 'breaking down the boundaries of creating process'. He worked with various field experts to make high quality works. He invited the public to participate in his creative process through the internet. Third is 'breaking down the categories of aesthetic expression'. He provided a wide variety of aesthetic standard and refused aesthetic stereotype. He broke the boundaries between fashion and art with a unique technique and high values.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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• pp.364-367
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• 2009

현재 국내에서 제조되는 저압 30AF(Ampere Frame) 소형 차단기의 경우 선로 단락사고 시 특성에 따라 순시 (Instantaneous) 동작이 다르게 반응함으로써 정전범위 확대, 정격단락차단용량(Rated short-circuit breaking capacities) 초과로 인한 폭발 및 Trip시 Arc방출 등 많은 문제점을 보이고 있다. 최종부하의 전단에 설치되는 저압차단기(Low voltage circuit-breakers)는 그 기능 및 역할이 큰 만큼 안전성을 중대시키는 것이 매우 중요하다. 본 논문은 국내에서 제조되는 30AF 소형 차단기의 사고유형과 제조사별 순시 Trip 동작속도의 시험 data를 확보하여 이를 분석하였다. 이는 향후 저압차단기의 안전에 관한 규격개정에 활용될 수 있을 것으로 사료된다.

• 한국해안해양공학회지
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• 제13권4호
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• pp.296-308
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• 2001

Wei et al.의 완전비선형 Boussinesq방정식을 4차의 Adams predictorcorrector기법을 사용하여 차분하고 면 내부조파기법과 스폰지 경계충을 사용하였으며 쇄파구조를 추가하였다. 면 내부조파기법을 사용해 목적파를 잘 재현할 수 있었다. 비선형성이 부각되는 고립파의 천수실험을 통해 완전비선형 모형의 정화성을 확인할 수 있었고 해저평붕으로 인한 규칙파의 변형을 모의해 보았다. 쇄파 수치실험을 통해 적용된 쇄파구조의 특성을 확인해 보았고 수중천퇴에 대한 이차원 파랑전파 수치실험을 통해 비선형 모형의 중요성을 확인하였다.

• 펄프종이기술
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• 제38권2호
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• pp.22-34
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• 2006

To improve the mechanical properties of Hanji, starches such as maize, konyaku, and wheat powders were added at various concentrations in the manufacturing processes of Hanji. The effect of starches on the physical properties of Hanji was as follows. Filling rates of surface of hanji were increased with the increase of the concentration of starch. Hanji surface were completely filled at the 3.0% konyaku treatment. Konyaku powder showed higher filling rates than maize and wheat powder. The breaking length was increased with the increase of filling rates. Konyaku powder showed the highest breaking length: Tear index of hanji treated with maize and wheat powder were a little improved but that of hanji treated with konyaku powder were a little decreased compared to non-treated hanji. In conclusion, starch treatment showed the increase of the breaking length, but no effect on tear index.

• 통합자연과학논문집
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• 제11권2호
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• pp.113-120
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• 2018

This study was planned to prepare the high strength hydrogel ophthalmic lens containing isocyanate group and nanoparticles. HDI with carbon nanoparticles were used as additives for the basic combination of HEMA, MA and MMA, and the materials were copolymerized with EGDMA as the cross-linking agent and AIBN as the initiator. The mixture was heated at $100^{\circ}C$ for an hour to produce the high performance hydrogel ophthalmic lens by cast mold method. Measurement of the physical characteristics of the produced material showed that the refractive index was in the range of 1.4027~1.4600, water content 25.21~44.01%, contact angle $54.18{\sim}72.94^{\circ}$, visible light transmittance 53.03~92.09%, and tensile strength 0.1024~0.2359 kgf and breaking strength was 0.0872~0.2825 kgf. The results showed an increase of refractive index while the decrease in water content. And also, the breaking strength was highest when the addition ratio of HDI was 5%(wt). As a result of the absorbance measurement, no significant difference was observed in all the samples, so it can be judged that the stabilization of nanoparticles in the polymer was maintained.

• 한국수자원학회논문집
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• 제46권5호
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• pp.491-504
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• 2013

본 연구에서는 shelf 지형을 대상으로 불규칙파를 적용한 2차원 쇄파변형 수리실험과 Boussinesq형 방정식을 이용한 수치해석을 수행하였다. 유의파고, 유의파봉고, 유의파곡고, 평균수위 및 안정파고와 같은 쇄파특성을 수리실험자료로부터 분석하였고, 실험결과와 Boussinesq형 방정식의 해석결과를 비교하였으며, 두 결과는 비교적 잘 일치하였다. 일정수심상에서의 불규칙파의 쇄파후 안정파고는 수심의 약 0.56배로 분석되었다.

• 한국해양공학회지
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• 제33권3호
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• pp.280-288
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• 2019

A submerged breakwater is one of the coastal structures used to reduce wave energy and coastal erosion. However, a submerged breakwater has a negative aspect in that a strong rip current occurring around an open inlet due to a difference in mean water levels at the front and rear sides of the structure leads to scouring. Such scouring has a bad effect on its stability. In order to eliminate this kind of demerit, this study investigated an artificial reef of the overflow type with openings. We also developed a program where the flows around the artificial reef of the overflow type could be analyzed numerically. An unstructured grid system was used to cover the various geometries, and the level set method was applied to treat the movement of the free surface. To verify these numerical schemes, hydraulic physical tests were performed on the submerged breakwater and double breaking type artificial reef. Then, the wave height and velocity distribution around the reef were examined using the experimental results. Comparisons between the results of hydraulic and numerical tests showed reasonable agreement.

• Structural Engineering and Mechanics
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• 제72권4호
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• pp.469-477
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• 2019

The understanding of tool-rock interaction mechanism is of high essence for improving the rock breaking efficiency and optimizing the drilling parameters in mechanical rock breaking. In this study, the tool-rock interaction models of indentation and cutting are carried out by employing the discrete element method (DEM) to examine the rock failure modes of various brittleness rocks and critical indentation and cutting depths of the ductile to brittle failure mode transition. The results show that the cluster size and inter-cluster to intra-cluster bond strength ratio are the key factors which influence the UCS magnitude and the UCS to BTS ratio. The UCS to BTS strength ratio can be increased to a more realistic value using clustered rock model so that the characteristics of real rocks can be better represented. The critical indentation and cutting depth decrease with the brittleness of rock increases and the decreasing rate reduces dramatically against the brittleness value. This effort may lead to a better understanding of rock breaking mechanisms in mechanical excavation, and may contribute to the improvement in the design of rock excavation machines and the related parameters determination.

• 전력전자학회논문지
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• 제27권6호
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• pp.489-497
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• 2022

This work investigates the commutation characteristics of the current flowing through an electrical-contact-type switch to the semiconductor switch branch during the breaking operation of hybrid DC switchgear. A simple, reliable, low-cost natural commutation method is proposed, and the current commutation characteristics are analyzed in accordance with the conduction voltage drop of the semiconductor switch branch through experiments. A prototype 400 V/10 A class natural commutation type hybrid DC switchgear is set up. Its performance is verified, and its characteristics are analyzed.

• 비파괴검사학회지
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• 제21권2호
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• pp.152-162
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• 2001

비파괴 평가 기술들 중의 하나인 레이저 초음파 응용 기술은 각종 구조물에 존재하는 표면결함에 의한 신호를 통해 건전성을 평가하는 기법이다. 따라서 결함의 신뢰성 높은 정량적 평가를 위해서는 결함으로부터의 레이저 초음파 신호특성에 대한 기본적 이해가 필수적이며 따라서 이를 위한 신호해석 연구가 요구된다. 본 연구에서는 레이저유도 초음파에 의한 one-sided 기법을 이용하여 표면균열을 평가하고자 하였다. 하지만 레이저를 이용한 평가방법들은 수신된 신호의 해석이 까다로우며 또한 상당한 전문적인 지식이 요구된다. 웨이블렛 변환(wavelet transform, WT) 기법은 신호처리 분야에서 하나의 새로운 방법으로서 다양한 분야에 적용되고 있으며 특히 한 시점에 대한 주파수 분해가 가능한 신호처리 방법으로서 시간-주파수 분석에 아주 유용하게 이용되고 있다. 본 연구에서는 이러한 레이저 유도 초음파를 이용하여 재료의 표면 결함신호들에 대한 웨이블렛 변환기법을 적용하여 보다 정량적인 결함 크기를 예측하고 그 타당성을 평가하고자 하였다.