• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.539-541
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• 2009

A severely cold weather condition of King Sejong Station, Antarctica becomes a very severe condition for an installation/operation of wind generation system. When the existing wind generation system works, it may cause a damage and destruction of wind generation system and can bring about big problems in terms of the power quality. Accordingly, it is essential to obtain technologies for the installation and operation of small wind generation system for the polar region's wind generation, and to assess and demonstrate the performance in the severely-cold environment and the polar wind generation system's development, supplementation, alteration. Also, as the available power of King Sejong Station, Antarctica, the diesel generator has been mainly used, and the wind generator has been used in the hybrid form. Wind generation and diesel generation has the different load following control each other. In the wind generation, the generated power very rapidly changes according to the change of the velocity of the wind. On the other hand, the diesel generation shows very gentle change in the velocity of output. Therefore, the study is intended to analyze the 10kw small wind generator-diesel generator's power quality of King Sejong Station, Antarctica, which is the hybrid system installation area.

• 한국환경복원기술학회지
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• 제18권6호
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• pp.167-177
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• 2015

This study was conducted to establish an inventory and propose conservation strategies for 'village wetlands' in Asan city, Korea, using GIS. As results, the village wetlands are defined as such places as 'palustrine' wetland, village embankment, agricultural reservoir or small reservoirs located in or near the village and related to everyday life or farming. Firstly 807 provisional village wetlands(draft) were identified in Asan by using Arc-GIS 10.1, then 196 wetlands(final) were defined finally as village wetlands and listed the inventory of Asan Village Wetlands after being validated through office works and field survey. The office works analyzed minimum area(greater than $625m^2$), satellite images, the Korea Land Information System, land use map and land coverage map. To evaluate the function and conservation values, the 37 wetlands were selected for detailed surveying and function assessment based on the following criteria : 1) doubled code both wetland and reservoir at digital map, 2) located less than 100m from village and 3) ecologically connected to such ecological resources as seaside mudflats, mountains and green area and ecological passages for small size wildlifes. As the result of the wetland function assessments by the RAM method, 7 wetlands were found to have 'high' wetland function (conservation) 18 wetlands were 'medium' (enhancement) and 12 wetlands were 'low' (restoration or enhancement). Enhancing biodiversity and ecosystem services through ecological management of wetlands in Asan and connecting with the Ecological Natural Degree were proposed.

• 한국실내디자인학회논문집
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• 제21호
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• pp.3-9
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• 1999

Contemporary society that is apt to be homogeneity because of the development of computer communication and mass-media desires to seek its own identity in native realm. Contemporary Korean architecture has endeavored continuous discussion and practice to keep its identity within the current tendency. The purpose of this study is to grope the alternative for genuine 'Koreaness' to analyse the variant trend of its characteristics 1990's. The variation of Korean society in 1990's that emphasize self-regulation and individual value has influence on the realm of architecture so much. The cognition of 'Koreaness' has changed with center in the individual and small -size design group, not present accommodation of past, but continuous research to find archetype of tradition which can play a decisive role of linking present and future on the foundation of past. Many attempts and practical works that express 'Koreaness' in 1990's are performed in the area of residence works that reflect Korean emotion and life-style directly. This change can be an answer to solve the problem of peculiarity and universality in 'Koreaness'. After 1960's the main theme of 'Koreaness' was traditional architecture form, but because of the induction of Postmodernism and at once its reflection and critical attitude with limit of formal duplication, which lost its meaning. In 1990's, research for spatial form as korean emotion and image has carried out and played an important part of original expression for 'Koreaness'

• 한국산업융합학회 논문집
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• 제23권5호
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• pp.727-733
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• 2020

Recently, reciprocating cryogenic pumps are mainly developed for small-and-mid sized fuel supply systems. Centrifugal type pumps are not actively developed. Most cryogenic submerged pumps are imported. For transportation, cryogenic liquefied natural gas requires the liquid pump technology that can works in extreme evironments. In order to transport liquefied natural gas, it is necessary to apply pump technology. This is the fundamental research for developing the submerged pump technology applicable to the transportation and storage system equipment of cryogenic liquefied system. It tries to secure basic design materials through reverse-engineering in the cryogenic submerged pump development. Regarding materials, STS-304 and STS-431 which are stainless materials widely used in the cryogenic area are applied. Aluminum alloy is applied to impeller and upper manifolder and the pump rotates at the high speed of 6,000rpm.

• 전자공학회논문지C
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• 제34C권8호
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• pp.49-63
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• 1997

This paper presents a current sensor that detects defects in CMOS integrated circuits using the current testing technique. The current sensor is built in a CMOS integrated circuit to test an abnormal current. The proposed circuit has a very small impact on the performance of the circuit under test during the normal mode. In the testing mode, the proposed circuit detects the abnormal current caused by permanent manufacturing defects and determines whether the circuit under test is defect-free or not. The proposed current sensor is simple and requires no external voltage and current sources. Hence, the circuit has less area and performance degradation, and is more efficient than any previous works. The validity and effectiveness are verified through the HSPICE simulation on circuits with defects.

• 한국항만경제학회지
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• 제18권1호
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• pp.61-83
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• 2002

Korea has designated 28 trade ports and 22 coastal ports under the Ports Act. If fishery ports and small inlets are counted, the number amounts to hundreds of ports. However, untimely and inefficient maintenance and repair works face Korean ports with functional loss, decreasing efficiency, and even catastrophe. Thus, further examinations on the maintenance or redevelopment of forts in Korea are urgent. Since the Korean War and the higher economic growth period in the 1970s, Busan Port has developed in a variety of ways, according to the necessity of social conditions at any given time, without any development Philosophy or systematic long-term master plan. As a result, ports and coastal industrial facilities have rushed to gather around the present North Busan Port, which has taken on mixed functions between ports and cities, adversely affecting several of their interactions. To resolve these circumstances, several redevelopment schemes were suggested for centering the old zone in the Busan Port interim. However, comprehensive evaluation and redevelopment schemes combining functions of both ports and cities, and effectively utilizing coastal zones have never been presented. In this respect, this study sets the priority order of the extracted unit project. This study analyzes the existing functions and facilities of Busan Port, extracting facility zones through redevelopment which is certain to fail or to decrease in efficiency. furthermore, this study presents status and development directions of specified redevelopment unit projects of higher priority order, and pursues the integrated plan of efficiency for Busan Port.

• 설비공학논문집
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• 제27권2호
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• pp.63-68
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• 2015

The fin and tube type heat exchangers widely used in air conditioners have been developed to improve on the heat transfer performance and compactness. This study presents the new type of tube for the heat exchanger to improve the heat transfer performance by increasing the heat transfer area per unit volume in the air-conditioner heat exchanger. The new type tube can be used for mechanical expansion facility, due to the two-port copper tube. Numerical calculation shows that the heat exchanger using the two-port copper tube outperforms the conventional heat-exchanger using a circular copper tube, in terms of the increased heat transfer coefficient and higher pressure drop. The calculation results were experimentally validated and are in agreement with the experimental results. Compared to the heat exchanger using a conventional circular tube, the heat exchanger with a two-port tube increased the heat transfer coefficient up to 21%, and the pressure dropped up to 16%.

• 한국어병학회지
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• 제24권3호
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• pp.213-223
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• 2011

충청남도 보령시 인근연안에서 어획된 문치가자미, Pleuronectes yokohamae 10개체 중에서 6개체가 피부에 육아종이 형성되었다. 기생충과 병원균으로 의심되는 세균은 증식하지 않았으며, 환부의 균질액을 CHSE-214 세포에 접종하였으나 CPE가 관찰되지 않았다. 환부를 광학현미경으로 관찰하였을 때 상피 세포의 증식으로 상피층은 정상개체와 비교하였을 때 유의적인 차이를 보이며 두꺼워졌고, 육아종 주름이 형성되었다. 비대되어진 상피세포는 핵융해 및 뚜렷하게 관찰되는 인이 특징이었으며, 세포질은 혼탁하였다. 이들 상피층에는 원형의 작은 핵과, 뚜렷한 인이 관찰되는 X-cell이 존재하였다. 진피층에는 다수의 신생 혈관들이 존재하고 있었다. 점액세포의 크기는 정상개체와 비교하였을때 유의적인 차이를 보이며 증가하였다. 본 연구에서는 병원체가 확인되지 않았지만 추가적인 실험을 통해서 원인체를 확인해야 할 것으로 생각된다.

• 복식
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• 제50권7호
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• pp.195-218
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• 2000

This study investigates the characteristics of European knitted works from a historical perspective. Specifically, this study deals with the following research topics: 1) the origin and development of knitting. 2) the characteristics of knitting industry according to the change of times, 3) the comparison of local knitting patterns and cultures. 4) 7he symbolic meaning of the designs in the knitted works and theire functions. This research is barred on the survey of the relevant literature and photographs. The results of the study are summarized as follows. 1) The introduction of knitted works was closely connected with the climatic and socio-economic conditions of the places of the origin. Knitted work developed mostly in Northern Europe, a cold area, and the barren, mountainous coastal areas where people frequently used woolen materials for clothes. 2) In ancient times, abstract and geometric patterns have developed in Europe under the influence of Arabian knitted work. Middle Ages saw the flourishing of Arabian knitted works representing the authority of the church. In early modern times, the knitted work assumed the wealth of the royal families and the nobles. But afterward it was gradually Popularized among the middle classes. Knitting was then regarded as one of the women's major cultural activities. However, recently in the interwar periods. the knitting industry did not flourish and the knitted works came to serve merely as comfort goods by political urge. Knitted works were introduced in Korea around 1870 (the 7th or 8th year of king Kojong era) by Catholic missionaries and they started to be made by machine in 1917. 3) As for the propagation of the knitted work into Europe, there are three routes estimated. The traditional knitting patterns of local areas and their characteristics are summed up as follows : (1) England Guernseys are thick dark blue wool, whereas Jerseys are thinner and of various colors. The knitted shawls of Shetland are world-famous for their fine, lace-like texture that they can be through a wedding-ring. The knitted work of Fair Isle shows several distinctive features, such as the use of no more than two colors, patterns with diagonal lines. symmetry within the patterns, the prominent OXO patterns, and horizontal bands of patterning. The representative knitted work of Aran is Aran sweater made for fishermen to developed from guernseys of Scotland. (2) Scandinavian countries are distinguished from other countries by their conservative but creative cultural tradition. Their knitting patterns are characterized by small geometric figures such as dots, triangles, squares, rhombuses, and crosses used often with stars and roses. Scandinavian knitting is also salient for its vertical stripes and simple motifs repeating at short intervals. (3) Baltic area : The Latvian and Lithuania stockings have very ornate patterns. Many of the Estonian knit stockings and mittens share designs. Komi was well-known for its symmetric diamond pattern. Komi patterns include colored stripes, borders of pattern and all-over designs of complex diagonals. (4) Balkan area : In Yugoslavia, the patterns of roses, leaves and flowers were used for stockings, gloves and leggings. Greek knitting resembled southern Russian knitting, which utilized light colored patterns with dark colors for a background. Turkish patterns are symmetric vertically or horizontally. 4) The traditional knitting patterns net only carried symbolic meanings but also served as means of communication. First of all, patterns had incantatory meanings. Patterns also represented Power or authenticity Patterns were symbolic of one's social standing, too. The colors, motifs and their arrangements were very important features symbolizing one's social position or family line. People often communicated by certain pieces of knitted work or patterns.

• 대한지리학회지
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• 제31권2호
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• pp.309-316
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• 1996

금세기에 들어서 지리정보의 폭발적 증가와 정보처리기술의 혁신으로 지도학과 지 리정보학 분야는 괄목할 발전을 이루었다. 그러나, 지난 반세기 동안 우리 나라의 지도학 연 구활동은 외국에서 개발된 지식체계의 소개와 응용이 주를 이루었을 뿐 아직도 미숙한 단계 에 머무르고 있다. 전통적 지도학 분야에서는 토지이용도, 경사분류도, 지형 모형 등에 관한 연구가 몇 편 있다. 컴퓨터 지도학 분야는 1990년을 전후하여 실험적 연구결과가 발표되기 시작하여 꾸준히 저변확대를 이루고 있다. 지리정보 시스템은 주로 단순문제에 응용하는 고 전적 수준의 연구가 주를 이루었다. 지리정보의 표준화 자료구조, 공간분석, 네트워킹 등의 기초연구는 최근에 들어서 시작되고 있다. 최근의 국내외 발전추세를 감안하면 지리정보학 은 지리학 뿐만 아니라 공간문제를 다루는 여러 영역에서 기초와 방법론 가운데 가장 효율 적인 것으로 평가될 것이다. 자료와 분석기술, 시각화 등의 기초이론이 급속한 발전을 이루 게 되고, 이에따라 복합문제에까지 광범위하게 적용될 것으로 전망된다.