• 방사선산업학회지
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• 제9권3호
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• pp.119-126
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• 2015

In Shinjeong-dong of Jeongeup, there are three government-supported research institutes and an RFT industrial complex which is currently being established. Increased human activities can affect flora and fauna as a man-made pressure onto the region. As a baseline study, status of exotic plants was investigated prior to a full operation of the RFT industrial complex. A total of 54 species and 1 variety of naturalized or introduced plants were found in the study area. Among them, three species (Ambrosia artemisifolia var. elatior, Rumex acetocella and Aster pilosus) belong to 'nuisance species', and four species(Phytolacca americana, Iopomoea hederacea, Ereechtites hieracifolia and Rudbeckia laciniata) to 'monitor species' designated by the ministry of Environment. Some of naturalized trees and plants were intentionally introduced in this area, while others naturally immigrated. Physalis angulata seemes to immigrate in the study area in the form of mixture with animal feeds as its distribution coincided with the transportation route of the animal feeds. Liquidambar styraciflua is amenable to the ecological investigation on the possible expansion of the species to the nearby Naejang National Park as its leave shape and autumn color are very similar to those of maple trees. The number of naturalized plants around the RFT industrial complex will increase with an increase in floating population, in human activities in association with constructions of factories and operations of the complex. The result of this study provides baseline data for assessing the ecological change of the region according to the operation of the RFT industrial complex.

• 화훼연구
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• 제18권4호
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• pp.291-294
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• 2010

접목선인장 신품종 '황운'은 해외 수출용 목적으로, 황색과 오렌지색을 가진 복색의 '황월' 품종을 모본으로 황색의 계통 '0111021'을 부본으로 교배하여 2008년에 개발되었다. 이 품종은 처음 기내에서 무병삼각주에 접목된 후 100 mL 시험관에 정식되어 6개월간 생육되었다. 2005년에 기외에서 접목한 후에 2008년까지 3회에 걸쳐 그 특성이 조사되었다. 구는 황색의 편원형이며, 몸체에 7~9개의 결각이 있으며, 갈색의 직립형 가시를 가지고 있다. 10개월간 재배되었을 때 구의 직경은 40.9 mm로 대조 품종 '후광'에 비해 구가 작고, 자구 착생수는 평균 22.3개로 '후광' 품종에 비해 우수하였다.

• Journal of Korea Trade
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• 제25권7호
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• pp.1-18
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• 2021

Purpose - In this study, we explore the relationship between the degree of internationalization (DOI) and firm performance (DOI-P) of small and medium-sized enterprises (SMEs) in the manufacturing sector. Specifically, we investigate whether the costs and benefits dynamics concerning the internationalization of SMEs differ between high-tech and non-high-tech industries. Design/methodology - We extend the prior literature on this relationship by employing 5-year data on 589 Korean SMEs in the manufacturing sector and examining the moderating impact of the industry characteristics. Our findings reveal a U-shaped relationship between the DOI and SME performance. High-tech SMEs demonstrate an inverted U-shaped relationship, whereas non-hightech SMEs exhibit a U-shaped relationship. Findings - Our findings illustrate the importance of the industry factor in testing the performance impact of the internationalization of Korean SMEs. By incorporating industry dynamics, our results indicate that the DOI-P relationship depends on the context of the industry in which an SME operates. High-tech SMEs also display a higher DOI but are outperformed by non-high-tech SMEs for the entire internationalization path, which implies that high-tech SMEs face more challenges than non-high-tech SMEs while seeking internationalization. Originality/value - The findings strongly validate that significant benefits exist for SMEs undertaking internationalization. We also employ the contextual framework contributing to increasing the understanding of the intrinsic value of internationalization and resolving the mixed results issue on the DOI-P relationship, by illustrating that the industry factor leads to different dynamics of costs and benefits of SME internationalization; it also determines the shape and direction of the relationship.

• 한국방사선학회논문지
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• 제15권2호
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• pp.181-189
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• 2021

본 연구는 방사선치료 시 사용하는 고정용구 인 열가소성 플라스틱 마스크를 3D 프린트로 제작하기 위한 선행 연구로써 열가소성 플라스틱을 대체할 수 있는 필라멘트 재질을 분석하고자 진행하였다. 시중에 상용화되어 있는 필라멘트 재질 중 열가소성 플라스틱 마스크와 특성이 유사한 재질을 선택하여 방사선량을 비교 분석하였다. 실험은 몬테칼로 시뮬레이션을 이용하였으며, 마스크가 두부를 고정한 형태를 ICRU구를 대상으로 모사하고 열가소성 플라스틱 재질과 필라멘트 재질을 적용하여 피부 Hp(0.07), 수정체 Hp(3), 전신 Hp(10) 지점에서 광자 플루언스를 계산하였다. 그 결과 열가소성 플라스틱 재질을 기준으로 상대적인 선량을 보면 차이가 4% 이내로 근사한 값을 나타내었으며, 가장 유사한 선량을 보인 재질은 PA-nylon으로 나타났다. 적절한 필라멘트 재질 선택에 있어서 경제성, 방사선 영향 등 다양한 조건을 종합적으로 고려하여 선택해야 할 것이며, 본 연구 결과를 기초적인 자료로써 활용할 수 있을 것으로 생각된다.

• 보존과학회지
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• 제35권1호
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• pp.19-31
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• 2019

To study the cleaning effects and post-treatment stability assessment of various methods of cleaning textiles with metal thread, six naturally-soiled historical textiles with metal thread were investigated at the Metropolitan Museum of Art, New York. Prior to the cleaning of fabricated gold, silver, and copper thread that had been glued onto a paper substrate, the artificial deterioration was carried out in a controlled environment with light(UV and daylight), and temperature and humidity factors which would weaken and damage the samples. A synthetic soil mixture was applied to the samples to imitate soil found on the historic and archaeological textiles with metal thread; the cleaning effect and post-treatment assessment were investigated by use of three textile cleaning methods: mechanical cleaning, wet cleaning, and solvent cleaning. While investigating the naturally-soiled textiles with metal thread, it was determined that the soil colors and sizes of contaminating particles of each textile were different due to the diversity of original environmental factors and conditions. After cleaning with kneaded rubber, Stoddard solvent, n-decane or n-hexane, a bright, clean effect was apparent. Kneaded rubber was successful in picking up both large and small particles, but its stickiness caused some of the metal leaf to peel off. Stoddard solvent produced a good cleaning effect, but after use of n-hexane and n-decane in the cleaning process, a white layer of residue remained on the textile's surface. Wet cleaning was not effective and the rapid humidity changes between wet and dry conditions caused the edges of the paper substrate to lose their original shape.

• 한국추진공학회지
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• 제23권1호
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• pp.33-45
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• 2019

본 연구에서는 좌, 우로 배치된 대칭형 핀틀 노즐의 고도 변화와 핀틀 위치 변화에 따른 특성을 파악하기 위해 수치해석을 수행하였다. 핀틀 노즐 형상은 선행연구를 수행한 직선형 핀틀 노즐을 사용하였고, 연소실 경계조건은 추진제 연소특성을 고려하였다. 해석을 수행할 유동해석 프로그램으로 사각노즐, 핀틀 노즐, 고고도 조건의 검증해석을 수행하여 적절한 해석기법을 설정하였다. 핀틀 위치는 full close, half open, full open 의 3가지 서로 다른 노즐 목 크기조건을 설정하였고, 고도는 0, 5, 20 km 조건을 설정하였다. 각 조건별 추력과 핀틀의 구동하중, 정적 안정성을 비교하여 연구를 수행하였다.

• 영미문화
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• 제16권2호
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• pp.47-70
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• 2016

Under the inhumane oppression of imperialism, the Third World's political violence has been often represented as an immediate and explosive one with an instant, concentrated visibility. Yet the ecological and psychological exploitation of the Third-World countries by empires, as Rob Nixon insists, shows the relative invisibility of slow violence. This paper is to reveal this slow violence of the marginalized areas symbolized as the lowland. Although Arne Naess' deep ecology promotes the inherent worth of living beings regardless of their instrumental utility to human needs. this paper deals with three postcolonial ecological textbooks which criticize the white-centered deep ecology: Amitav Ghosh's The Glass Palace, Jhumpa Lahiri's The Lowland, and Barbara Kingsolver's The Poisonwood Bible. Through postcolonial critical study, this paper finds out that all these three works have some themes in common. First, these postcolonial works assume a shape of family saga which is parallel to the slow violence of ecological and psychological plundering of empires in the postcolonial countries. Second, like the mangroves which have a tenacious hold on life, these postcolonial people rather overcome the heterogenic challenge with the sturdy and tough mind than defeated. Third, the native people's ethics of earth functions as the stronghold for their respectable lifestyle in their indigenous historicity. Finally, as a big fat brother, the Americanized globalization or neoliberalism is warned as the neocolonialism which is often shown as the disguised pattern of greenwashing. Namely, the people's self-enhancement is always prior to the imperialistic development or neoliberalism in the postcolonial ecological texts which sharply contrast the native's life consciousness and the empire's development theory.

• 천문학회지
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• 제55권5호
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• pp.149-172
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• 2022

We present a new method which constructs an Hɪ super-profile of a galaxy which is based on profile decomposition analysis. The decomposed velocity profiles of an Hɪ data cube with an optimal number of Gaussian components are co-added after being aligned in velocity with respect to their centroid velocities. This is compared to the previous approach where no prior profile decomposition is made for the velocity profiles being stacked. The S/N improved super-profile is useful for deriving the galaxy's global Hɪ properties like velocity dispersion and mass from observations which do not provide sufficient surface brightness sensitivity for the galaxy. As a practical test, we apply our new method to 64 high-resolution Hɪ data cubes of nearby galaxies in the local Universe which are taken from THINGS and LITTLE THINGS. In addition, we also construct two additional Hɪ super-profiles of the sample galaxies using symmetric and all velocity profiles of the cubes whose centroid velocities are determined from Hermite h3 polynomial fitting, respectively. We find that the Hɪ super-profiles constructed using the new method have narrower cores and broader wings in shape than the other two super-profiles. This is mainly due to the effect of either asymmetric velocity profiles' central velocity bias or the removal of asymmetric velocity profiles in the previous methods on the resulting Hɪ super-profiles. We discuss how the shapes (𝜎_n/𝜎_b, A_n/A_b, and A_n/A_tot) of the new Hɪ super-profiles which are measured from a double Gaussian fit are correlated with star formation rates of the sample galaxies and are compared with those of the other two super-profiles.

• 패션비즈니스
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• 제26권4호
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• pp.32-51
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• 2022

This study analyzed the characteristics and expression techniques of men's fashion bags and their aesthetic and formative values in modern men's fashion from the perspective of neo-deconstructivism. The study subjects were men's fashion bags appearing in four collections in Paris, Milan, London, and New York in the 2019 S/S-2021 S/S season. As a research method, the characteristics and expression techniques of the new disintegration of men's fashion bags were analyzed and categorized through prior research and literature research. The results of the study are as follows: First, the neoclassical characteristics of men's fashion bags caused 'Re-creation' to appear as the dissolution of the design principle and structure of the bag, and it was derived as 'decomposition of form' and 'decomposition of dress method'. Second, the 'Inclusive Diversity' of modern men's fashion bags of neo-deconstructivism appears in the form of gender demarcation and dissonance coordination. Third, 'Playfulness' in men's fashion bags involves the pursuit of fun through unconventional changes in the shape, size, and design of the bag, and it sometimes provides a fresh, new play experience through unpredictable design elements. Fourth, the 'Pursuit of new values' in male's fashion bags was a characteristic wherein the boundary between DIY attire and daily clothes and high fashion by the individual selection of consumers was blurred. This work is meaningful in that it conducted a basic study of men's fashion bags by examining the modern men's fashion bag from the perspective of the philosophical trend of neo-deconstructivism and categorizing its characteristics.

• 한국지반공학회논문집
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• 제22권12호
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• pp.45-55
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• 2006

본 논문에서는 우리나라 태안지역에서 총 30회 수행한 암반앵커 현장시험의 결과를 나타내었다. 대상암반은 편마암으로써 풍화가 심한 것부터 신선한 암에 이르기까지 다양하며, 시험앵커의 깊이는 $1{\sim}4m$로 설치하였다. 앵커는 SD4O-D51mm를 사용함으로써 다른 파괴가 일어나기 전에 암반파괴가 먼저 일어나도록 유도하여 암반의 인발지지력을 파악하고자 하였다. 많은 시험에서 파괴는 극한하중까지 이르는 것을 관찰할 수 있었으며, 암반파괴형상은 암반이 들어올려지면서 방사상으로 균열이 발달하는 형상을 나타내었다. 시험결과, 암반앵커의 인발지지력은 암반의 종류, 암질, 앵커의 정착깊이, 앵커텐던의 인장강도 등에 영향을 받는 것으로 나타났다. 본 시험을 통해 암반앵커시스템의 인발지지력을 지배하는 주요파라메터들을 도출하고 이에 대해 논하였다.