• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.9
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• pp.5738-5743
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• 2014

This paper evaluated an electric wheelchair control algorithm by slope recognition on uneven terrain. Nowadays, the population using wheelchair has been increasing rapidly due to increases in the elderly population. On the other hand, most wheelchairs are directly controlled by the user without any device capable of securing the safety of the user. This causes difficulties in wheelchair control from the influence of gravity on the slope. This paper proposes a vehicle control algorithm that can move a wheelchair similar to moving on a plane. At that time, sensors are not used to recognize the degree of the slope. All processes were verified by simulation.

• Proceedings of the KAIS Fall Conference
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• 2007.05a
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• pp.95-98
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• 2007

본 연구에서는 설계기준에 제시된 평지 전도 안전율 계산식을 바탕으로 경사지에서의 지반의 저항모멘트를 산정하기 위해 범용 해석 프로그램 L-Pi1e P1us13.8을 사용하여 기존 연구와 검증하고 지반의 일반적인 토질상태별 특성을 고려한 내부마찰각, 접착력, 흙의 단위중량, 지반종류, 사질토 및 점성토 지반계수를 적용하여 각 전주의 근입깊이에 따른 지반의 저항모멘트를 산정하였다. 또한 토질등급에 따른 토질의 상태별 특성이 고려된 4가지 경우를 선정하여 12m 중하중용 전주를 대상으로 경사지의 경사각을 $0^{\circ}{\sim}35^{\circ}$까지 $5^{\circ}$씩 증가시켜 지반의 저항모멘트를 산정하였다. 그 결과 경사지 경사각에 따른 저항모멘트가 감소하는 것을 확인 할 수 있었으며 그에 따른 경사지의 근입깊이 증가가 필요한 것으로 판단된다.

• The Journal of the Acoustical Society of Korea
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• v.21 no.2
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• pp.142-149
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• 2002

With rapid industrial development, a railway has become a main traffic means. But, the railway noise has caused much annoyance for the residents living nearby railway tracks. Therefore, execute regulation standard of railway noise has established for quite dwelling environment from January 2000. However efficient soundproofing measures are very difficult because of the lack of basic data and insufficiency of the existing research. In this point, this study attempts to survey the characteristics of attenuation and propagation of railway noise. And this study intends to get the basic data for establishment of a standard for domestic railway noise.

• KIEAE Journal
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• v.13 no.6
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• pp.83-91
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• 2013

Cool roofs are currently being emerged as one of important mechanism to save energy in relation to the building. It is specifically proposed that the changing trends of rooftop surface temperature in the flat roof building model could be used effectively as an indicator to reduced cooling load reduced by cool roof since it can present stable temperature record, that is not influenced according to the nearby physical as well as human variables. The temperature of cool roof in summer was lower around $20^{\circ}C$, compared to the general roofs. Such a seasonal or daily comparative study for rooftop temperature in the building model will highlight that the cool roof efficiency could be calculated in much area-wide context according to rooftop color distribution in urban residential area. It is anticipated that this research output could be used as a valuable reference in identifying energy saving by cool roof since an objective monitoring has been proposed based on the rooftop temperature in the building model, fully quantitative performance of thermal infrared image.

• Journal of the Korean Association of Geographic Information Studies
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• v.11 no.3
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• pp.183-192
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• 2008

The Purpose of this study is to find the land use condition and housing development of hillside areas in Busan metropolitan city. For this purpose, data of land use in more than meters above the sea level 80m are collected and analysed. The results of this study provide that 44.22% of the area of Busan hold more than meters above the sea level 80m and many aged buildings occupy the hillside areas. Moreover 30.13% of the redevelopment zone in housing redevelopment hold more than meters above the sea level 80m. In consequence, buildings of hillside areas should be maintained and it is necessary to make topographical adaptation plan. Based on these findings this study suggests that introduce the Conjoint Renewal Program.

• Convergence Security Journal
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• v.6 no.3
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• pp.37-47
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• 2006

In this research, We connect the terrestrial magnetism sensor of the Philips to a bluetooth communication system and measured 360 degree of the azimuth change the angle with an incline of 5 degrees to an order direction. The value of the azimuth to be measured sent to the Bluetooth communication system and analyzed the measuring value in the 100m as moved. Using the bluetooth, we could send the measuring value of the azimuth without the bearing error in the plain without an electric wave obstacle within a distance in straight line 100M. We got the value of the azimuth have 98% reliability to maintain at a level with the terrestrial magnetism sensor. Based on this research. We send the measuring value of the azimuth which the accuracy is improved to a mobile intelligent robot moving a land inclined equipped with this system and can track the azimuth of it.

• Journal of the Korean earth science society
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• v.25 no.8
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• pp.784-798
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• 2004

Microscale wind fields were simulated by MUKLIMO at the Naro Space Center, where complicated mountainous terrain and trees exist. In order to test the model's sensitivity with the effects of terrain and trees, experimental simulations were conducted under the various initial conditions. The experiments showed that the effects of trees were more significant on flat surfaces than on mountain cliffs. Based on the results, an actual 10 m level microscale wind field was simulated at the Naro Space Center, which has complicated mountainous terrain. Simulations of wind fields before and after the construction of the launching site were also conducted. It was found that MUKLIMO was of the mesoscale wind fields at the Naro Space Center.

• Korean journal of applied entomology
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• v.33 no.4
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• pp.237-241
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• 1994

Surveys were conducted in 66 ginseng fields damaged by insect and other an~mal pests from 1984 to 1993. Holohichio rnoroso, Holotrichio dromphalio, Holotrichia titonis Malodera orientaliq Ectinus sericeus, Gyllotalpa ofricana, Teleog~iluse mmo, Ostrinio furnacoii* Agrotis tokionis, Marnestro brassicae, Hydrellia griseolo, unidentified stem maggo$, Pseudococcus comstocki (13 species of insects). Deroceras uarions (slug), Acusta despecta sieboldiona (snail), probably two species of rats. and pheasant species were ascertained to damage ginseng plants M them, Holotrich~a morosa, Holotrichia diomphalia, Gryliotaipo africanq Deroceras uarions, Acusto despech siebaldiano showed higher frequencies. Underground (root) damage occul~ed mainly in spring penod (MayJune) and fall period (September-Odober) in 2-year-old glnseng fields at slopes, and aboveground (leaf and stem) damage occurred mainly in spring period in 3 or more-year-old ginseng iields mulched with rice straws at plains. Three ginseng fields were abolished due to heavy underground damage.

• Journal of Welding and Joining
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• v.13 no.3
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• pp.18-33
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• 1995

천연가스는 지구상에서 비교적 광범위하게 생산되며 구미 등에서는 대부분 pipe line으로 소비지까지 운송하여 사용하고 있지만 일본 등에서는 액화 천연가스 (LNG)로 저장, 수송하여 사용하고 있다. LNG 저장탱크는 생산측의 액화기지와 사용측 의 수입기지에 설치되며 지금까지 약 240기가 건설되어 있다. 종래 탱크 1기의 용량 은 대부분 6 - 8만m$^{3}$ 규모였지만, 토지의 유효이용 등으로 대형화되고 있으며, 또 지상식에서는 PC(Prestressed Concrete)의 방파제를 외부탱크에 근접시켜 외부탱크 와 일체화시킨 PC LNG 탱크가 개발.설계되었다. 일본에서는 이미 이 방식으로 세계 최대규모인 14만m$^{3}$ 탱크가 건조되어 가동 중이다. LNG의 주성분은 메탄이고 비등점은 -161.5.deg.C로 극저온이다. 이러한 저온에서도 취화되지 않고 사용할 수 있는 재료는 9%Ni강, Al 합금, 스테인레스강 및 Invar 등이 있지만, 탱크의 대형화에 따라 가공성, 용접성 및 경제성을 고려하여 요즈음은 9%Ni강이 주로 사용되고 있다. 한편 9%Ni강용 용접재료는 고Ni계 합금 및 모재와 동일한 성분계의 공금계가 있지만 지금까지 고 Ni계 합급이 주로 사용되고 있다. 본 내용에서는 9%Ni강을 사용한 지상식 평지원통형 LNG 탱크를 예로 들어 탱크의 개요 및 용접재료, 용접시공 등을 포함한 용접기술에 대해서 개괄적으로 설명하고자 한다.

• Aerospace Engineering and Technology
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• v.11 no.1
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• pp.118-125
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• 2012

The purpose of this study is to analyze the ortho image quality change according to the generation technique of Digital Elevation Model(DEM) based on the digital map. First of all, two different types of DEM were generated using contour layer(Case1), contour layer and altitude layer(Case2) from the digital map on the scale of 1/5,000. After generating and evaluating two types of DEM, KOMPSAT-2 ortho images were generated by using them. In conclusion, Case2 DEM was more effective to use in the slope and switchback area, on the other hand, Case1 DEM was much better than Case2 DEM for preventing a topographic distortion in flat area.