• Bulletin of the Korean Chemical Society
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• 제19권10호
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• pp.1036-1042
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• 1998

The preconcentration and determination of trace elements in water samples were studied by a solvent sublation utilizing dithizonate complexation. After metal dithizonates were formed, trace amounts of cadmium, cobalt, copper and lead were floated and extracted into small volume of a water-immiscible organic solvent on the surface of sample solution and determined in the solvent directly by GF-AAS. Several experimental conditions as formation condition of metal-dithizonate complexes, pH of solution, amount of dithizone, stirring time, the type and amount of surfactants, N2 bubbling rate and so on were optimized for the complete formation and effective flotation of the complexes. And also four kinds of light solvents were compared each other to extract the floated complexes, effectively. After the pH was adjusted to 4.0 with 5 M HNO3, 8.0 mL of 0.05% acetone solution of dithizone was added to 1.00 L water sample. The dithizonate complexes were flotated and extracted into the upper methyl isobutylketone (MIBK) layer by the addition of 2.0 mL 0.2% ethanolic sodium lauryl sulfate solution and with the aid of small nitrogen gas bubbles. And this solvent sublation method was applied to the analysis of real water samples and good results of more than 85% recoveries were obtained in spiked samples.

• 국토계획
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• 제53권7호
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• pp.87-107
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• 2018

With more than 10 million inhabitants, in particular, Seoul, the capital of Korea, has already experienced a number of severe heat wave. To alleviate the potential impacts of heat wave and the vulnerability to heat wave, policy-makers have generally considered the option of heat wave strategies containing adaptation elements. From the perspective of sustainable planning for adaptation to heat wave, the objective of this study is to identify the elements of vulnerability and assess heat wave-vulnerability at the dong level. This study also performs an exploratory investigation of the spatial pattern of vulnerable areas in Seoul to heat wave by applying exploratory spatial data analysis. Then this study attempts to select areas with the relatively highest and lowest level of adaptive capacity to heat wave based on an framework of climate change vulnerability assessment. In our analysis, the adaptive capacity is the relatively highest for Seongsan-2-dong in Mapo and the relatively lowest for Changsin-3-dong in Jongno. This study sheds additional light on the spatial patterns of heat wave-vulnerability and the relationship between adaptive capacity and heat wave.

• Journal of Astronomy and Space Sciences
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• 제36권3호
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• pp.115-119
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• 2019

This paper is a part of the series on positron annihilation spectroscopy of two-phase diffuse gas-and-dust aggregates, such as interstellar medium and the young remnants of type II supernovae. The results obtained from prior studies were applied here to detect the relationship between the processes of the annihilation of the K-shell electrons and incident positrons, and the effects of these processes on the optical spectra of their respective atoms. Particular attention was paid to the Doppler broadening of their optical lines. The relationship between the atomic mass of the elements and the Doppler broadening, ${\Delta}{\lambda}_D$ (${\AA}$), of their emission lines as produced in these processes was established. This relationship is also illustrated for isotope sets of light elements, namely $^3_2He$, $^6_3Li$, $^7_3Be$, $^{10}_5B$ and $^{11}_5B$. A direct correlation between the ${\gamma}-line$ luminosity ( $E_{\gamma}=1.022MeV$) and ${\Delta}{\lambda}_D$ (${\AA}$) was proved virtually. Qualitative estimates of the structure of such lines depending on the positron velocity distribution function, f(E), were made. The results are presented in tabular form and can be used to set up the objectives of further studies on active galactic nuclei and young remnants of type II supernovae.

• 한국멀티미디어학회논문지
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• 제22권1호
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• pp.70-78
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• 2019

The smart festival costume developed in this study maximizes the design elements by attaching electronic device to clothing, and uses voice, movement, and light sensor to utilize as expression elements. In addition, as a way to maximize cultural exchanges between Korea and China, smart festival costume was developed by applying smart clothing technology to the traditional costumes of both countries. and it was exhibited for 10 days at the 'Andong International Mask Dance Festival 2018'. The smart festival costume has the effect of multiplying the dynamism and excitement of the festival by the use of colorful lighting and it has been evaluated that the experience of wearing traditional costume of both countries contributes greatly to promote international cultural exchange. However, since smart clothing is inconvenient to wear due to the use of electronic products, meticulous research for consumer safety is required for practical use. Smart devices is expected to utilize for the development of traditional culture resources and the fashion industry in the future.

• Architectural research
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• 제22권4호
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• pp.113-122
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• 2020

Hospital architecture must be planned as a therapeutic space. Numerous studies have proven that exposure to nature has a healing effect. However, research on the architecture itself about this issue is still insufficient. This study analyzed Le Corbusier's Venice hospital project and its architectural configurations with nature. Le Corbusier had been interested in blurring the interior/exterior line to draw nature inside. In his projects, nature was conceived in an abstract sense as "something green." However, in the hospital project, natural elements including vegetation, the lagoon, and light, and the landscape scenery they created, were considered in the harmony of the architectural space. The architectural spaces with courtyards, pilotis, and roof gardens provided views and direct access to nature, and in the interior spaces, the connections to these external spaces and the permeation of views of nature and sunlight were incorporated. Many spaces provided the possibility to actually encounter nature, with a variety of indoor/outdoor space configurations rather than a merely passive placing of some natural elements. This project is considered to be an important reference for contemporary hospital architecture, since the architectural space and nature connected through various spatial configurations also in healthcare programs. As Le Corbusier emphasized, sunlight, vegetation, and also architectural space should be an essential factor in therapeutic hospital architecture planning.

• 한국산업융합학회 논문집
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• 제23권6_2호
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• pp.935-941
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• 2020

In this study, the effect of different shapes on the heat dissipation characteristics of other porous frames on LED lighting frames was studied using finite element analysis. In addition, the heat transfer characteristics of LED frames were tested using a thermal imaging camera and the results of finite element analysis were compared to derive the optimal hole shape. According to the study, the heat dissipation effect was better for frames with hole compared to existing ones without holes. In particular, the heat dissipation characteristics test showed that for frames with holes, the rise time to the maximum temperature is fast and the maximum temperature is significantly lower. Also, we could see that the square and diamond shapes were smaller than the circular pores, but had a greater heat dissipation effect. Through this study, we have concluded that there is a limit to increasing the heat dissipation effect of the frame with a perforated shape, and it is necessary to conduct further research on the change in the shape of the frame in order to achieve a better heat dissipation effect in the future.

• Advances in materials Research
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• 제11권1호
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• pp.59-73
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• 2022

In the construction industry, thin-walled frame elements with very slender open cross-sections and low torsional stiffness are often subjected to a complex loading condition where axial, bending, shear and torsional stresses are present simultaneously. Hence, these often fail in instability even before the yield capacity is reached. One of the most common instability conditions associated with thin-walled structures is Lateral Torsional Buckling (LTB). In this study, a first order Generalized Beam Theory (GBT) formulation and numerical analysis of cold-formed steel lipped channel beams (C80×40×10×1, C90×40×10×1, C100×40×10×1, C80×40×10×1.6, C90×40×10×1.6 and C100×40×10×1.6) subjected to uniform moment is carried out to predict pure Lateral Torsional Buckling (LTB). These results are compared with the Finite Element Analysis of the beams modelled with shell elements using ABAQUS and analytical results based on Euler's buckling formula. The mode wise deformed shape and modal participation factors are obtained for comparison of the responses along with the effect of varying the length of the beam from 2.5 m to 10 m. The deformed shapes of the beam for different modes and GBTUL plots are analyzed for comparative conclusions.

• 감성과학
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• 제13권4호
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• pp.677-686
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• 2010

전통의 가치를 현대 디자인에 적용하여 전통을 계승 보존하며 현대적 디자인에 활용을 위한 접근방법을 찾아 전통을 현대화할 수 있는 체계화된 디자인 방법이 필요하다. 따라서 본 연구는 전통공예기술을 디자인과 접목하여 전통적 가치의 맥을 있고, 현대 사용자의 욕구를 충족시킬 수 있는 디자인 지원시스템 구축을 위해 전통공예지술인 짜임에서 사용자의 선호에 영향을 주는 요소를 추출하여 디자인에 적용하고 활용할 수 있는 자료를 제시하고자 한다. 이에 본 연구는 그 기초연구로 짜임을 디자인에 작용하는데 있어 심미성과 기능성을 기준으로 선정하고 짜임에서 중요시 되는 디자인 요소를 추출하는 실험을 진행한 결과 요인분석을 통해 심미성과 기능성에서 전형성, 독창성, 시대성, 생산성, 안전성이 짜임에 영향을 주는 요소로 도출되었고, 유의성 분석을 한 결과 판재짜임과 연귀짜임이 각 요소별로 가장 유의한 것으로 나타났다. 이 결과는 향후연구에서 짜임의 감성요소로 추출된 요소와의 관계성을 알아봄으로써 짜임을 디자인에 적용하여 디자인할 때 가이드라인이 될 디자인 지원시스템 구축을 위한 지표로 활용될 수 있다.

• 분석과학
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• 제21권4호
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• pp.272-278
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• 2008

$AG^{(R)}$ 50W-X8 양이온교환수지를 이용하여 14종의 희토류원소와 Y를분리하고, 유도결합플라스마 원자방출분광법(ICP-AES)으로 분석하는 방법에 대해 연구하였다. 수지에 대한 희토류원소의 이온교환용량은 매우 커 pH 1~6 범위와 0.3~1.0mL/min의 흐름속도에서 희토류원소는 모두 정량적으로 이온교환 되었다. 희토류원소의 돌파점 용량 곡선은 경희토류원소(Cerium 그릅)의 이온교환능력이 중희토류원소(Yttrium 그릅) 보다 큰 것을 보여주었다. 100mg의 이온교환수지에 각각 $200{\mu}g$의 희토류원소들이 이온교환 되어있을 때 대부분의 중희토류원소는 2.0M의 질산 10 mL로, 경희토류원소는 30mL로 정량적으로 탈착시킬 수 있었다. 본 방법으로 모나자이트 중에 희토류원소를 분석하였다. 모나자이트 중에 공존하는 Ti, Mn, Mg, Ca 등의 원소는 상대적으로 희토류원소 보다 이온교환 능력이 낮아, 매트릭스 원소로 부터 희토류원소의 분리가 가능하였다. 그러나 본 방법에서 분석 결과의 상대표준편차는 1~5%로 향상되지 않았다.

• 문화기술의 융합
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• 제9권3호
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• pp.519-528
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• 2023

월드컵 엠블럼의 시각적 특징은 문화 및 정체성의 전달, 대회의 핵심 요소 강조, 브랜드 이미지 강화는 데 중요한 역할을 하고 있다. 본 연구는 첫째, 선행 연구를 통해 엠블럼의 시각적 요소와 이론적 배경을 조사했다. 둘째, 상징성, 형태, 색상를 선택하는 것을 연구 주제로 삼았다. 셋째, '100대 민족문화 상징'을 기준으로 하여 형태 관련 이론을 기반으로 하고, 'IRI 배색 이미지 스케일'을 도구로 삼아 상징성, 형태 및 색상을 각각 분석하고, 최종적으로 결론을 도출했다. 월드컵 엠블럼은 민족성 상징, 생활적 상징을 많이 사용하며, 생활적 상징과 민족성 상징은 서로 조합한 형태로 나타낸다. 초기에는 대칭 형태가 많았지만 그 후에는 비대칭 형태로 변화했다. 곡선 표현 형태가 직선 표현 형태보다 많이 사용된다. 그리고 배색 이미지 스케일 분포는 대부분 경쾌하고 다이나믹하고 모던적인 배색 특징을 나타낸다. 앞으로 월드컵 엠블럼 디자인은 민족적 상징과 생활적 상징을 계속 사용한다. 엠블럼의 형태는 곡선과 비대칭적인 디자인을 사용해야 하고 직관적이어야 하며, 대회 주제를 직접적으로 반영할 수 있어야 한다.또한 메인 색상은 국기색을 사용하고, 보조 색상으로는 다른 색상들을 사용해야 한다. 색상의 조합은 IRI 배색 이미지 스케일의 경쾌하고 다이나믹하고 모던한 색상 특징과 일치해야 한다.