• Proceedings of the Korean Fiber Society Conference
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• 1996.04a
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• pp.147-150
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• 1996

단백질 섬유의 일종인 견섬유를 저온 플라즈마로 전처리한 후 효소처리하여 미처리시의 시료와 플라즈마처리 시료 및 효소처리한 시료에 대하여 역학특성, 염색성 및 태평가에 대해 비교, 고찰해 보았다. 인장강도, 인열강도 시험을 통해서 역학특성을 조사하였고, 산성 염료로 염색한 후 염색성의 변화를 알아보고, 염색견뢰도를 시험하였다. 플라즈마 전처리가 태평가에 미치는 영향을 알아보기 위해 Handle-O-Meter를 사용하여 태를 평가하였으며, SEM으로 시료의 표면을 관찰했다. 실험결과 플라즈마 전처리가 효소처리에 잇어서 섬유의 표면 특성 변화에 영향을 미친다고 생각된다.

• Journal of the korean Society of Automotive Engineers
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• v.9 no.5
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• pp.25-33
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• 1987

최근 저연비 및 차실내거주성향상의 관점에서 볼 때 소형차의 대부분이 FR에서 FF방식으로 바뀌며 차체의 경량화가 적극적으로 추진되고 있다. 본문에서는 수평식엔진 FF차(4기통, 4cycle엔진)에 관해 공회전시 진동과 급가속시의 쇼크진동 (shock vibration)을 중심으로 차체진동을 시험, 해석하고 이에 관련한 각각의 요소들을 총괄적으로 검토함으로써 차체나 엔진지지부의 합리적인 설계를 하는데 필요한 것들을 검토하였다.

• Journal of the Korean association of regional geographers
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• v.4 no.1
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• pp.57-76
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• 1998

Yanji(延吉) city is the district seat of the Yanbian(延邊) Korean Autonomous District where is located in the Jilin(吉林) Province in China, and also the largest city with a population of three hundred sixty thousand, Since the mid-1980s, the inter-exchange and cooperation between Yanbian District and South Korea has been increased rapidly. That draw many scholars' attention to studying Yanbian District and Korean Chinese as a research theme for area studies. Unfortunately they neglect the study of the commerce and service industry in Yanbian city, which has indicated its rapid growth by the market economic policy of China, and an inter-exchange between Korean Chinese and Korean. The purpose of this study is to provide an information to many Korean potential investors for an investment strategy of the commerce and service industry in Yanji city. In order to do so, this study consists of three major steps. First of all. we analyzed the regional structure and locational characteristics of the commerce and service industry in Yanji City. Secondly, we investigated the characteristics of consumers behavior toward purchasing goods and service facilities. Finally, we supplied the proper businesses and location information for investment to Korean firms according to the results that identified above. In conclusion, we suggest that the proper businesses to invest are department store, retail clothing store, shoes store, cosmetics store, electronics and home appliances store, oversea branch offices of trading companies, Korean-style restaurant, hotel, nightclubs, Korean-style music room(Noraebang), travel agencies, beauty parlors, video rooms, electronic games, and so on. We also suggest that the proper locational areas to invest those businesses are the core area of the commerce and service industry in Yanji, where are Xinxing(新興) 3-zone and Jinxue(進學) 2-zone expressed in the Yanji city figure.

• Journal of Korean Library and Information Science Society
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• v.42 no.2
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• pp.151-170
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• 2011

This article tries to analyze some examples applied the analytico-synthetic classification techniques found in the practical life. For this purpose, it selected and investigated the cases of the combination rules of the Hangeul, the number systems of the city buses of Daegu and Seoul Cities, information of the members of the wedding consulting agencies, information from real estate agents and court auction, and postal codes and direct distance dialing(DDD) numbers in Korea. It suggests that applying the analytico-synthetic classification techniques to the systems can improve them especially in the regards of notational systems.

• Journal of the Korean earth science society
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• v.27 no.6
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• pp.677-686
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• 2006

Surface evapotranspiration is one of the most important factors to determine the surface energy budget, and its estimation is strongly related with the accuracy of weather forecasting. Surface evapotranspiration over Daegu Metropolitan was estimated using high resolution LANDSAT TM data. The estimation of surface evapotranspiration is based on the relationship between surface radiative temperature and vegetation index provided by a TM sensor. The distribution of NDVI (Normalized Difference of Vegetation Index) corresponds well with that of land-used in Deagu Metropolitan. The temperature of several part of downtown in Deagu metropolitan is lower in comparison with the averaged radiative temperature. This is caused by the high evapotranspiration from dense vegetation like DooRyu Park in Deagu Metropolitan. But, weak evapotranspiration availability is distinguished over the central part of downtown and the difference of evapotranspiration availability on industrial complexes and residential area is also clear.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.6 no.1
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• pp.81-87
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• 1994

The mild slope equation has been directly derived from the energy equation, and the relation between energy equation and Green's first and second identities was also clarified. It is shown here that the mild slope equation of elliptic type in the wave-current interaction has to have the same form as the one derived by Berkhoff (1972), and its physical meaning was investigated through analytical solutions.

• Journal of the Korean Magnetics Society
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• v.4 no.2
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• pp.106-113
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• 1994

This paper deals with the magnetic forces of the combined levitation and guidance EDS(Electrodynamic Suspension) maglev system when the car bogie is tilted by the roll, pitch and yaw. The end effect on the magnetic forces are considered by calculating the air-gap flux without the assumptions for its pattern. Induced voltages and currents of the ground coils are given as results. The restoring torque due to roll, pitch and yaw of the bogie body are also examined. It has been shown that the end effect of the concentrically loaded vehicle are not negligible and the combined EDS is stable maglev system against disturbing forces.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.966-967
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• 2006

본 논문에서는 250W 메탈핼라이드 램프용 전자식 안정기의 구조 및 디밍 방법에 따른 특성을 비교하였다. 측정 및 분석된 안정기는 PFC, 벅 컨버터, Full-bridge 인버터의 3단 구조를 가진 안정기와 PFC, Half-bridge 인버터의 2단 구조를 가진 안정기이다. 3단 구조를 가진 안정기의 경우 벅 컨버터의 듀티 조절하여 출력 전력을 제어하며, 2단 구조 안정기의 경우는 구동 주파수를 조절하여 전력을 제어한다. 본 논문에서는 각각의 전력제어 방식을 통한 램프 디밍 시의 출력의 특성을 측정 및 분석하였으며, 조도 조절 범위는 $100%{\sim}35%$까지 구현하였다.

• Proceedings of the KAIS Fall Conference
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• 2004.11a
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• pp.284-287
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• 2004

홍제천 유역의 평창 배수분구를 대상으로 합류식 하수관거 월류수의 발생특성을 파악하고자 유량 및 오염물질 발생경향, 오염물질별 상관관계, 연간 강우유출 오염부하량 등에 대하여 살펴보았다. 강우시 오염물질의 초기세척현상은 누적오염 부하량비를 이용하여 분석하였으며, 모든 수질항목에 대하여 초기유출현상이 나타났으며, 초기 $20\%$ 유출 유량에서 오염부하가 $30\%$ 정도로 유출되고 있는 것으로 분석되었다. 또한 수질항목별 상관계수를 보면, 건기시의 상관계수는 COD와 SS가 0.4857, 월류수의 경우에는 SS와 TN의 상관계수가 0.7723으로 가장 크게 나타났다. 연간 강우에 의하여 방류선으로 배출되는 면적당 오염부하는 COD 1,202kg/ha/yr SS 494kg/ha/yr로 산정되었다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.6
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• pp.8-17
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• 2010

This paper proposes a novel LCD CCFL-backlight electronic ballast using the phase-shift full-bridge inverter. The proposed electronic ballast reduces the ignition voltage and eliminates current spikes using the new digital dimming control applied with soft-starting. Thus the electronic ballast improves ignition behavior of the CCFL and hence increases the CCFL's life span. For this, this paper analyzes the full-bridge inverter topology of the proposed electronic ballast and explains the new digital dimming control algorithm applied to the ballast, briefly. And this paper shows a design example of the prototype circuit and explains an implementation method of the digital dimming control which is implemented on a single-chip microcontroller with software. This was implemented as actual prototype electronic ballast, and its experimental results showed that the proposed electronic ballast operates correctly. The ignition voltage of the prototype in the digital dimming operation was reduced about 30[%] compared with the conventional electronic ballast and there were not any current spikes.