• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1861-1863
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• 2007

In rock mass, great many discontinuity exists that is caused to various factors of formation. But these are parted to some groups by specific category, so called these as discontinuity set. This discontinuity set has unique special characteristics in original rock mass, but for the moment, differ the special quality if external force such as digging etc. acts, specially, change of stress condition. Also, geometrical relation change between discontinuity orientation and direction of excavation various characteristic is seen. Therefore, we introduce here the useful chart that can do specification these relation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.103-108
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• 1988

A walking robot must have the ability to change the body direction in order to avoid the obstacles. In this paper, we develop a gait control algorithm that can maintain the stable movement of the robot for three different modes of changing directions. The algorithm makes it possible for the robot to have the larger gait stability margin than the threshold value by the method of changing the body speed.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.386-389
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• 2006

The sea surface wind speed (SSWS) derived by microwave radiometer can be contaminated by change of microwave brightness temperature owing to the angle between the sensor azimuth and the wind direction (Relative Wind Direction). We attempt to correct the contamination to the SSWS derived by Advanced Microwave Scanning Radiometer (AMSR) on Advanced Earth Observing Satellite II (ADEOS-II), by applying the method proposed by Konda and Shibata (2004). The improvement of accuracy of the SSWS estimation amounts to roughly 60% of the error caused by the RWD effect.

• 대한금속재료학회지
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• 제46권12호
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• pp.800-808
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• 2008

Heat treatment is an important step for tool manufacture, but unavoidably generates dimensional distortion. This study investigated the continuous dimensional change and the anisotropic behavior of STD11 tool steel during austenitizing and tempering heat treatment especially using quenching dilatometer. Dilatometric results represented that the dimensional change along longitudinal direction was larger than that along transverse direction. Anisotropic phase transformation strain was produced in forged STD11 tool steel during heat treatment. Anisotropic dimensional change increased with increasing austenitizing temperature. After tempering, anisotropic distortion was partially reduced. FactSage thermodynamic equilibrium phase simulation and microstructural observation (FE-SEM, TEM) showed that large ($7{\sim}80{\mu}m$) elongated $M_7C_3$ carbides could be formed along rolling direction. The resolution of elongated carbides during austenitizing was found to be related with the change of martensite transformation temperature after heat treatment. Anisotropic size change of STD11 tool steel was mainly attributed to large elongated carbides produced during rolling process. Using dilatometric and metallographic examination, the possible mechanism of the anisotropic size change was also discussed.

• 한국컴퓨터정보학회논문지
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• 제23권7호
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• pp.91-97
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• 2018

This study has an ultimate purpose to find some change direction of education in the Korean language education field, that is, in and out of the Korean language classroom keeping up with social changes. Especially, this study will investigate progressive educational ways in terms of not only developing software, but also grafting hardware relating to mobile technologies. For this, this study will classify the cases of teaching and learning happened in and out of Korean language classrooms and to introduce practical ways of education to apply mobile technologies according to the each case. As a concrete method, this paper proposed a change plan of classroom change that incorporates 'Miracast' and 'smart phone' and a change plan out of the classroom using mesh. This study can be meaningful in that the teaching and learning are linked more organically through the smart phone and the education is called 'IoT world' so that both teachers and learners can easily access education.

• 한국측량학회지
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• 제13권2호
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• pp.169-176
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• 1995

경년변화추출기법은 임의 시간 $t_1,\;t_2$에 대한 픽셀대 픽셀, 밴드대 밴드의 변화를 나타내는 기법이다. 본 연구에서는 주기적인 수준측량결과를 경년변화기법을 중심으로 수치영상해석기법, 보간법, 수치지형모델을 이용하여 해안의 모래유동을 현상학적으로 해석하였다. 모래의 유동량 및 이동방향, 해류의 방향 및 영향, 정선을 기준으로한 상하부의 모래이동, 해안 모래의 침식 및 퇴적량 변화, 침식지역 및 퇴적지역을 추출하여 해안의 침식 및 퇴적 원인을 규명하므로서 효율적인 해안관리방안을 제시하는데 목적이 있다.

• Journal of the Korean Wood Science and Technology
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• 제24권4호
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• pp.32-39
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• 1996

The overall purpose of this study was to investigate the dimensional changes of melamine sheet laminated medium density fiberboard(MDF) floorings by sub-heating system(Ondol). This study was also conducted to improve the properties of melamine sheet laminated MDF floorings. The effects of density, resin content, manufacturing speed of MDF and types of melamine sheet on dimensional and weight changes of floorings were investigated. The results were as followings. 1. Dimensional and weight change of melamine sheet laminated MDF flooring by heating decreased with decreasing the density of MDF. 2. Dimensional and weight change of melamine sheet laminated MDF flooring by heating decreased with increasing the resin content of MDF. 3. Dimensional and weight change of melamine sheet laminated MDF flooring by heating decreased with decreasing the manufacturing speed of MDF. 4. Dimensional change of melamine sheet laminated MDF flooring in width direction by heating was doubled than that in machine direction. 5. Dimensional change and curling of high pressure melamine laminate(HPM) laminated MDF flooring by heating was less than those of low pressure melamine laminate(LPL) flooring. 6. Weight loss of melamine sheet laminated MDF flooring by heating has linear relationship with shrinkage.

• 대한금속재료학회지
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• 제50권1호
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• pp.13-22
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• 2012

Forged and flat-bar rolled STD11 tool steel shows anisotropic dimensional change during heat treatment. The dimensional change in the rolling direction is larger than that in the transverse direction. The cause of the anisotropic dimensional change is that the steel is anisotropic in composition, microstructure and other properties. The decrease of anisotropic distortion in tool steel is important for making better precision cold working dies. In this study, the effect of ingot weight and hot rolling reduction ratio on the anisotropic dimensional change of STD11 during heat treatment has been studied. Dimensional change was evaluated by simulating a real heat treatment process, including gas quenching and tempering. Experimental results showed that all the rolled flat-bar products had anisotropic distortion to some degree, but the anisotropic distortion was reduced as hot rolling ratio increased. Ingot weight had a little effect on anisotropic distortion. Microstructural observation showed that the anisotropic dimensional change of STD11 tool steel was closely related to the amount, shape and distribution of coarse carbides.

• 한국환경과학회지
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• 제20권9호
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• pp.1191-1203
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• 2011

In case of Typhoon Dianmu, the temperature, wind speed, wind direction and the rainfall per hour changed dramatically when the center of the typhoon passed through Gimhae. Such a change was commonly found in the regions where the center of the typhoon passed through but almost not in the regions far away from it. For example, in the case of Typhoon Malou where the center of the typhoon was far away from the observation site, such a phenomenon was not observed. The analysis of the vertical observation data showed that there was a little change in the wind speed and wind direction in the vertical direction in the case of Typhoon Dianmu of which center passed through Gimhae. There was a great change in the wind speed according to the height in the lower atmosphere just before the center of the typhoon approached the region. When the center of the typhoon was passing through the region, the vertical wind speed was decreased. However, the wind speed was rapidly increased again after the center of the typhoon had passed through the region. Unlike the Dianmu, the difference in the wind speed and wind direction between the upper layer and lower layer of the atmosphere was relatively great in the case of Malou.

• 산업융합연구
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• 제17권1호
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• pp.33-39
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• 2019

본 연구에서는 기후변화에 대응하는 도시개발의 실천적 실행을 위해서 기후위험요인 측면과 환경적인 측면으로 대별하여 도시개발 방향과 시사점을 제시하는데 목적을 두었다. 연구방법으로는 정성적인 자료조사와 분석을 통해 이루어졌다. 연구결과, 기후위험요인에 따른 도시개발방향은 도시계획수립시 기후변화 영향을 통합적으로 고려할 수 있는 지역별 부문별 영향 및 취약성 분석을 실시함으로써 자연재난에 대한 피해예방 시스템 구축과 자연재해 위험도 분석을 실시해 도시개발을 할 수 있는 여건 마련의 중요성을 강조하였다. 환경적측면의 도시개발방향은 친환경적인 도시개발을 위해서는 도시계획수립시 대중교통지향적인 도시개발(TOD, Transit­oriented Development)의 추진이 지속가능하고 실행적인 도시개발을 실현하는데 그 필요성을 제시하였다. 향후 연구방향은 보다 더 정량적이고 실증적인 규명을 위한 연구가 보완되어야 할 것이다.