• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.22 no.1
• /
• pp.7-16
• /
• 2008

Lighting for gas station should be carefully designed with safety and visually attraction. Recent studies have shown that non-cutoff luminaires should not be used for gas station. duo to light pollution and energy waste. This paper aims to evaluate the luminous environment in gas station with non-cutoff luminaires. The CS-100 and Radiant Imaging Prometric-1400 were used to measure the luminance of building surface, canopy, ceiling and ground surface. The result shows that the whole luminance of various combination elements in gas station increases by rising the total luminaires of the canopy. All of the gas stations with non-cutoff luminaries produce light pollution. Some guidelines for outdoor lighting in gas station is necessary.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.18 no.2
• /
• pp.276-281
• /
• 2014

In this research, we describe a force feedback control for industrial robots has been proposed as a system which is suitable to work utilizing pressure sensitive alternative to human. Conventionally, polished surface of the workpiece are recognized, chamfer ridge, machining processes such as deburring, and it is most difficult to automate because of its complexity, has been largely dependent on the human. To aim to build automatic vacuum system robotic force control was gripping the grinding tool, the present study we examined the adaptability to the polishing process to understand the characteristics of the control system feedback signal obtained from the force sensor mainly. Furthermore, as a field, which holds the key to the commercialization, I went ahead with the application to robotic sweeping machine. As a result, the final sweeping utilizing a robot machine to obtain a very good grinded surface was revealed.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2015.11a
• /
• pp.156-157
• /
• 2015

The safety concern of slipping on floors in South Korea has come to the fore as a social problem, but the occurrence of such accidents has not decreased. Slip and fall accidents have several causes, but they are especially common when there is soapy water on the floor during a shower or a bath. Despite this situation, it can be said that there is a lack of standards on surface contamination materials used in floor slip resistance testing. Therefore, in this study, we conducted a survey to identify the components and quantity of soapy water that actually results from a user taking a shower, and the standardization of contamination materials. Based on the results of this experiment, we provide a surface contamination material that can replace the soapy water used in floor slip resistance testing.

• Journal of the Korean Society for Precision Engineering
• /
• v.33 no.3
• /
• pp.225-230
• /
• 2016

Since the development of anodic aluminum oxide (AAO), extensive studies have been conducted ranging from fundamental research to the applications of AAO. Most of the research on AAO structures have focused on well-aligned nanoporous structures fabricated under specific conditions. This study investigated fabricable AAO structures with anodization performed with various temperatures, electrical potentials, and basal plane surfaces. As a result, nanoporous and nanofibrous structures were fabricated. The nanopores were formed at a relatively lower temperature and potential, and the nanofibers were formed at a relatively higher temperature and potential regardless of the basal plane surface. The shape of the base surface was found to influence the structural arrangement in nanoporous morphologies. These interesting findings relating to new morphologies have the potential to broaden the possible applications of AAO materials.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2007.05a
• /
• pp.513-516
• /
• 2007

임하다목적댐은 낙동가 하구로부터 약 356 km 상류에 위치하며 댐체의 길이 515 m, 높이 73 m의 rockfill 댐으로서, 총저류량은 595 백만$m^3$이다. 댐의 정상표고는 El. 168 m이고, 저수위 El. 137.0 m와 계획홍수위 El. 164.7 m 사이에서 운영되고 있다. 임하다목적댐의 표면취수설비는 댐우안 도수로 입구에 위치하며 콘크리트구조물로서 높이는 44.0m이다. 취수탑의 바닥표고는 EL.124.0 m이며 월류수심은 7.0m이다(한국수자원공사, 2004). 최대취수량은 $119.2m^3/s$이며 취수문은 직선형다단식게이트형식이고 폭 10.0m, 높이 6.0m의 게이트 5조와 폭 10.0m, 높이 3.25m의 게이트 1조로 구성되어있다. 본 연구에서는 미국 YSI사에서 제작한 ADV-6600을 이용하여 저수지에서 취수시 유속을 측정하여 취수구간이 저수지의 연직방향 유속에 미치는 영향을 분석하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 1993.10a
• /
• pp.38-43
• /
• 1993

현재의 오피스는 공간이 좁고, 바닥위의 배선이 장애물이며, 형광전구가 노출된 조명으로 실내 작업환경에 대한 고려가 매우 미약한 점에 의심할 여지가 없다고 생각된다. 특히 OA기기의 도입에 따른 집무 공간의 감소, 프린터 소음, 기기의 발생열, 배선, VDT(Visual Display Terminal:화면이 있는 OA기기) 작업과 관련된 환경 관리, 작업관리, 건강관리의 필요성등의 문제가 발생하고 있다. 그러므로 쾌적한 분위기를 구성요소로 조명은 실의 LAY OUT, 표면처리, 배색등 인테리어 디자인과 함께 그 효과를 최대한으로 연출하도록 되리라 생각된다. 따라서, 자연채광 이용을 통하여 절감될 수 있는 인공조명(형광등)의 제어방법으로서 본 논문에서는 점멸방식(ON,OFF)을 시도하였으며 점멸에 따른 급격한 조도저하를 보다 심리적인 차원을 고려한 실내조명 조광장치(천정형태와 외부에 댄 반사판)로 인한 실내조도 분포의 영향에 대하여 파악하고자 하였다.

• Journal of the Korean Professional Engineers Association
• /
• v.44 no.4
• /
• pp.44-49
• /
• 2011

For the pleasant dwelling place, the most of apartments are designed with the increased green area ratio in ground space and the underground parking lot. However, the condensation in underground space has occasionally occurred due to the insufficient ventilation and insulation treatment. Despite reinforcement of the insulation treatment and mechanical ventilation for the preventing method of condensation. It seems difficult to expect preventing effects for the condensation without consideration of the thermal characteristic of structures. Furthermore, no fundamental measure has been established because maintenance work for these defects incurs a lot of costs and these defects could be occurred again. This study suggests a new method for preventing floor surface condensation through analyzing the reasons of condensation which occurred in the underground floor.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2011.05a
• /
• pp.308-308
• /
• 2011

하천에서 유량을 산정하기 위해서 전자파표면유속계를 이용하여 표면유속을 측정하고 수심평균유속환산계수 0.85를 일률적으로 적용하여 수심평균유속을 산정하고 있다. 이 수심평균유속환산계수 0.85의 적절성에 대한 논의가 지속되어져 왔으나 그 동안에는 이에 대한 현장검증을 할 수 있는 방법이 없었던 실정이다. 하지만 최근 들어서는 ADCP(Acoustic Doppler Current Profiler)의 하천용 Application인 StreamPro ADCP가 개발되어 이를 이용하면 홍수기에 수심별 유속을 측정할 수 있다. 다만 홍수기에 StreamPro ADCP의 적용시에는 여러 가지 높은 위험성이 상존하는 것은 인지의 사실이지만, 그 외의 별다른 방법이 없는 실정이다. 따라서 홍수기에 StreamPro ADCP를 이용하여 수심별 유속을 측정하고 이와 동시에 측정한 표면유속을 이용하여 수심평균유속환산계수를 산정하여 기존에 환산계수로 적용하고 있는 0.85의 적절성을 파악하고자 하였다. 흐름조건별 수심평균유속환산계수 산정을 위하여 평수기 용담 수자원시험유역의 동향지점에서 수심평균유속환산계수를 산정한 결과 0.632~1.352로 넓게 분포하고 있음을 파악하였다. 이렇게 계수가 실제 적용하는 0.85와는 크게 차이가 나는 이유로는 수심이 얕아서 바닥마찰의 영향이 크기 때문인 것으로 판단되었다. 이에 본 연구에서는 여러 지점에서 홍수기 수심별 유속의 실측을 통하여 수심평균유속환산계수 분포정도를 산정하고자 하였다. 대청댐 상류의 수통수위표가 위치해 있는 적벽대교지점에서 StreamPro ADCP를 이용하여 수심평균유속환산계수를 산정한 결과 0.735~0.986 사이에 분포하고 있다. 측정한 결과의 수심평균유속환산계수의 평균값은 0.853으로 기존에 수심평균유속의 산정을 위하여 적용하고 있는 0.85와 거의 일치함을 보이고 있다. 측정당시 수심이 3.6 m에 이르고 있고 유속 또한 1.55 m/s에 이르고 있어 홍수시 일반하천에서 발생하는 수위와 유속임을 감안할 때, 0.735~0.986의 수심평균유속환산계수는 홍수시 순간적인 변화의 폭이 큼을 알 수 있다. 이렇게 순간적인 변화가 큰 이유로는 난류의 성분이 강해서 나타나는 것으로 이를 평균하면 0.853으로 나타나고 있어 홍수시에 수심평균유속환산계수를 0.85를 사용하여도 무방함을 알 수 있다. 동향지점에서 홍수기에 수심별 유속의 실측을 통하여 수심평균유속환산계수를 산정하고자 하였다. 그러나 이 지점은 강한 와류로 인하여 ADCP가 심하게 흔들림으로 인하여 순간적인 유속의 차이가 최대 4배까지 보임을 알 수 있다. 이로 인하여 수심평균유속환산계수의 범위는 0.233~0.983에 이른다. 측정당시 표면유속이 2.07 m/s 인 것을 감안하여 이 표면유속에 상응하는 수심별 유속 자료만을 이용하여 산정시, 수심평균유속환산계수는 0.876이다. 하천의 하류지점에서 수심별 유속을 측정하여 수심평균유속환산계수를 산정하고자 한강하류로 유입하는 굴포천의 구교 및 박촌1교 지점에서 유속측정을 실시하였다. 이들 두 지점은 홍수기에 조차도 유속이 1 m/s 에 이르지 못하는 지점으로, 수심평균유속환산계수를 산정한 결과 각각 0.826, 0.833을 나타내고 있어, 수심평균유속환산계수 0.85가 홍수기뿐만 아니라 평 갈수기에도 적용할 수 있는 가능성을 확인하였다.

• 한국지구물리탐사학회:학술대회논문집
• /
• 2002.09a
• /
• pp.139-162
• /
• 2002

Since weak zones or geological lineaments are likely to be eroded, weak zones may develop beneath rivers, and a careful evaluation of ground condition is important to construct structures passing through a river. Dc resistivity surveys, however, have seldomly applied to the investigation of water-covered area, possibly because of difficulties in data aquisition and interpretation. The data aquisition having high quality may be the most important factor, and is more difficult than that in land survey, due to the water layer overlying the underground structure to be imaged. Through the numerical modeling and the analysis of case histories, we studied the method of resistivity survey at the water-covered area, starting from the characteristics of measured data, via data acquisition method, to the interpretation method. We unfolded our discussion according to the installed locations of electrodes, ie., floating them on the water surface, and installing at the water bottom, since the methods of data acquisition and interpretation vary depending on the electrode location. Through this study, we could confirm that the dc resistivity method can provide the fairly reasonable subsurface images. It was also shown that installing electrodes at the water bottom can give the subsurface image with much higher resolution than floating them on the water surface. Since the data acquired at the water-covered area have much lower sensitivity to the underground structure than those at the land, and can be contaminated by the higher noise, such as streaming potential, it would be very important to select the acquisition method and electrode array being able to provide the higher signal-to-noise ratio data as well as the high resolving power. The method installing electrodes at the water bottom is suitable to the detailed survey because of much higher resolving power, whereas the method floating them, especially streamer dc resistivity survey, is to the reconnaissance survey owing of very high speed of field work.

• Applied Chemistry for Engineering
• /
• v.16 no.1
• /
• pp.112-116
• /
• 2005

We investigated the surface modification method for the preparation of organic-inorganic hybrid composite thin film. Gelatin obtained from the decomposition of collagen was allowed to adsorb in a polystyrene tissue culture dish for 2 h to from layers of gelatin. Supersaturated ionic solution of calcium and phosphorus was injected on the gelatin adsorbed layer to form calcium phosphate thin film. During the initial period of incubation, nucleates were formed. With increase of the incubation time, CaP (calcium phosphate) thin film grew on the surface of the culture dish. The gelatin/CaP thin film displayed the highly porous three-dimensional surface structure. Attenuated, total reflectance Fourier transform, infra-red spectroscopy (ATR-FTIR) was used to analyze the chemical properties of CaP film. The analysis demonstrated that the CaP film formed at initial period of treatment appeared to be amorphous. With increase of incubation time, the crystallinity of the film was slightly increased, but the presence of the peaks for the low crystalline CaP confirmed that the CaP thin film prepared in this study was poorly crystallized.