• 접착 및 계면
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• 제18권4호
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• pp.171-178
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• 2017

최근 들어, 다층박막법(Layer-by-Layer(LbL) assembly)을 이용한 표면 젖음성 제어 기술이 큰 관심을 받고 있다. 다층박막법은 고분자, 계면활성제, 나노 입자 등과 같은 다양한 재료를 이용하여 수직 구조와 표면 특성을 나노 및 마이크로 스케일로 제어할 수 있는 다기능적이며 친환경적인 제조방법이다. 본 논문에서는 다층박막법을 이용하여 표면 특성을 제어하는 기술의 최근 동향을 살펴보고자 한다. 특히, 초발수, 초친수, 초발유/초친수 LbL 표면의 제조와 응용에 대한 기술 동향과 연구 결과를 기술한다. 또한, omniphobic, 자가-치유, 지능형 및 외부 반응형 표면 등 최근 각광을 받고 있는 분야의 기본적인 원리와 제조 방법 등에 대해 소개하고자 한다.

• 한국축산시설환경학회지
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• 제7권2호
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• pp.63-76
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• 2001

A survey was conducted for dairy farmer to manage efficiently of a milking machine and equipment. Labor hours, operation costs, and milking cares for each dairy farmer to estimate the expected numbers of machine and equipment on the basis of the desired dairy farm scale. Based on the results of this research the following conclusions were made: Those who possessed a herringborn system and a tandem parlour system were relatively small portion 2% and 25% respectively of the whole dairy farmer. To improve dairy farmer\`s life, or to reduce his hard labor hours. it was necessary for most of dairy farmers to possess a herringborn system and a tandem parlour system. However, it was difficult for most of farmers to purchase a herringborn system and a tadem parlour system, because these system were very expensive. Only 20% farmers of the whole farmers repaired their milking system, which needed to be repaired quickly enough so that it might was used everyday. Among the parts of milking system, pulsator was found to have the highest breakdown ratio 59%, and vacuum pump was the breakdown ratio 27%. It took more than 2 hours to be milked twice a cow per one day. It means that milking spend so much time. Therefore, the auto milking system should be supplied to decrease hard labor hour.

• 한국실내디자인학회논문집
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• 제25호
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• pp.184-190
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• 2000

If we take account of the Architectural Tradition which aims a construction of better environment, we can see that this tradition has ended historically toward Utopia. It is a continual trend from ancient to contemporary epoch especially in each transitional periods. Utopia is an ideal commonwealth in which inhabitants exist under perfect conditions, ideally perfect places or state of things. But, Dystopia implies skeptical perspective on the future which has emerged as a result of the increasing awareness about crisis concerning negative aspects highlighted by progress of science and technology since Modern era. Dystopia is the opposite of Utopia which was a propaganda used by Modern architecture and has characteristics of Post-Modernity. Utopias plans are complete projects of image, its goal is an improvement according to the eras. Its plans are characterized by rigid geometrical pattern as circle and square, which contain generally center·axis·enclosure·boundary·symmetry. Recent architectural circumstances no longer reflect utopian visions. Dystopias plans have described extreme mechanism, destructive offense, expression of fragmentation and differentiation in contemporary architecture. Therefore, as the Utopian architecture describes characteristics of the era unlike the continuity of its concept, the Dystopian architecture will find its expression differently while maintaining its basic concept and intention.

• 한국분말재료학회지
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• 제10권2호
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• pp.89-96
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• 2003

The recent trend of miniaturization and high performance of vehicle engines has put an urgent necessity for the development of valve seats which can operate under more severe conditions. In order to develope valve seat material that has the most excellent wear resistance at operating temperature of engine through improvement of the progress of work. the effects of mixing ratio of the milled powder on sintered and Cu-infiltrated properties of sintered valve seats have been studied. The resultant radial crushing strength and hardness of sintered specimens were gradually increased with increasement of volume of milled powders. It is because increasement of sintering density by increasing of surface diffusion. The hardness of Cu-infiltrated specimens became lower than that of the commercial powders as the increasement of volume of milled powders. It was due to the decrease of the amount of the martensite. By results of this research, It has been found that martensite is formed around of the Cu-infiltrated site and the decrease of the amount of the martensite is due to decrease of the amount of the Cu-infiltrated site by the decrease of gas channel.

• 한국실내디자인학회논문집
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• 제21권5호
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• pp.317-327
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• 2012

Recent studies show that social networking within community is becoming more valuable than individualism, and many discussions of importance of social networking are taking place. In architectural term, the ultimate goal of designing public community space is to increase retention of people. Retention of people, in other words, making people "Stay Longer" is not exactly same as "The purpose of Public Community Space", but it is one of the most effective methods to increase retention of people. An attempt of increasing retention of user through offering public community space suggests a significant change in spatial composition of Herman Hertzberger's cultural space as they are becoming a new social interaction trend. This study aims to analyze architectural progress for the implementation of public of Herman Hertzberger's cultural project. Access. The Characteristics of public community space used in cultural space were extracted and organized into the systemized elements. The systemized elements are comfort, connect, continuity, sphere, transition, and abide. Also, the extracted elements were activated Herman Hertzberger's cultural space and processed the his architectural characteristics.

• 한국실내디자인학회논문집
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• 제21권1호
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• pp.269-279
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• 2012

According to a progress in the quality of life and economy, recent years have seen an increase in interest in the cruise travel. However, it is important to provide them the optimum embarkation environment since there are to be many and unspecified persons staying for a long period on the cruise ship. In the architectural design field, a wide range of efforts are being recently made to meet customer's requirements by considering the rapidly changing society, environment, and economic trend. The most representative one of such efforts is the inclusive design concept. This concept means to perform design satisfying all the function, convenience, aesthetic appreciation, and utility, regardless of sex, age, ability, nationality, cultural background or any kinds of disabilities. Regarding this trend, the convenience-oriented design of a cruise ship using the inclusive design concept was performed in this study. To do this, the composition of cabins and swimming pools, and the exterior of the cruise ship were classified into several groups through literature survey. Then, in the point of view of the inclusive design concept, inconvenience matters of passengers about the cabins, swimming pools, and exterior were also extracted from literature survey. Next, basis designs for them were selected among the classified groups in order to solve such inconvenience matters. Finally, the convenience-oriented design of the Emerald Princess Cruise considering the inclusive design concept was performed by applying the basis designs. As a result, we can see that the inclusive design concept can be applied to cruise ship design.

• 분석과 대안
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• 제8권2호
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• pp.31-64
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• 2024

최근 한국 국민의 통일필요 의식의 하락 추세는 선명하다. 통일필요 의식 하락 추세에 있어 출생 코호트 효과는 존재하는가? 본 연구의 목적은 통일필요 의식에 있어 출생 코호트가 통계적으로 유의미한 영향을 미치는지 분석하는 것이다. 이를 위해 분석모형으로 위계적 연령-기간-코호트(HAPC) 모형을 채용하였으며 2007~2021년 기간 서울대학교 통일평화연구원의 통일의식조사 데이터를 사용하였다. 분석 결과, 출생 코호트 수준에서 경제불평등의 진행이 통일 필요성 인식 하락에 영향을 미쳤다는 증거가 관찰되었다. 소득과 자산의 양극화 진행으로 인해 사회 진출 과정에서 사회경제적 어려움을 겪은 1980년대 출생 코호트는 막대한 재원이 투입되는 남북통일에 대해, 1960년대와 1970년대 출생 코호트와 비교해 선명하게 부정적인 인식을 가지는 것으로 판단된다.

• 한국표면공학회지
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• 제55권2호
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• pp.51-62
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• 2022

Metal-organic framework (MOF) is one of the representative porous materials composed of metal ions and organic linkers. In spite of many advantages of the MOFs such as high specific surface area and ease of structure control, drawbacks have become obstacles to the practical use of them with poor electrical conductivity and chemical stability. The ZIF-8, which is consisted of zinc and imidazole linker, is one of the solutions to improve the chemical stability issue. In addition, composites using the ZIF-8 and carbonbased materials are widely used to enhance the electrical conductivity. In this regard, supercapacitor is very attractive field for using the composites, because most of carbon-based materials are porous and conductive. Also, for sensor applications, the ZIF-8 composite is suitable material to meet the requirement in terms of the selectivity and sensitivity. This review summarizes recent progress of the composite materials with the ZIF-8 and the carbon-based materials for the supercapacitors and the chemical sensors. In particular, the composites are classified into ZIF-8-graphene, ZIF-8-carbon nanotube and ZIF-8-other carbon-based material.

• 한국재료학회지
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• 제32권2호
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• pp.98-106
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• 2022

Metal-organic frameworks (MOFs) are widely used in various fields because they make it easy to control porous structures according to combinations of metal ions and organic linkers. In addition, ZIF (zeolitic imidazolate framework), a type of MOF, is made up of transition metal ions such as Co²⁺ or Zn²⁺ and linkers such as imidazole or imidazole derivatives. ZIF-67, composed of Co²⁺ and 2-methyl imidazole, exhibits both chemical stability and catalytic activity. Recently, due to increasing need for energy technology and carbon-neutral policies, catalysis applications have attracted tremendous research attention. Moreover, demand is increasing for material development in the electrocatalytic water splitting and metal-air battery fields; there is also a need for bifunctional catalysts capable of both oxidation/reduction reactions. This review summarizes recent progress of bifunctional catalysts for electrocatalytic water splitting and metal-air batteries using ZIF-67. In particular, the field is classified into areas of thermal decomposition, introduction of heterogeneous elements, and complex formation with carbon-based materials or polyacrylonitrile. This review also focuses on synthetic methods and performance evaluation.

• 한국의상디자인학회지
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• 제10권3호
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• pp.89-100
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• 2008

This article aims to research and analyze expressional characteristics of media art in Hussein Chalayan's fashion works. Media technology has made rapid progress over every society, in which it enables multi-dimensional communication. Under this social background, media art can use a multiplicity of technologies and go public. Media art had great influences in fashion with the leading designer as Hussein Chalayan. His works has been selected from the 90s up until 2008 focusing on expressional characteristics of media art by a professional group of fashion design. By classifying and analyzing of Hussein Chalayan's fashion works, expressional characteristics of media art displayed from works of the late 90s, and in recent years, the use of various technologies has increased. Expressional characteristics of media art in his works have been re-classified as interactivity, transfonnation, visualization, and transparency. First, interactivity by the wearer's action and emotional change is effective on emotional express, body protection and the causing of interest. Second, transfonnation by the wearer's action, functioning, and emotional change is influenced by convenience, body protection, and causing concern. Third, immateriality in media art is divided into visualization and transparency, and in fashion structural and material characteristics. Visualization by internal luminous source and digital images influences immersion and expression on fantasy images. Fourth, transparency by immaterial characteristics and piled up images affects openness and camouflage. Development of material and technology paves the way for expressional characteristics of media art in fashion. The trend of Hussein Chalayan's works moves towards emotional high-tech design with technology.