• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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• pp.19-23
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• 2004

Light is an environmental element which is essential for a man to live and do creative activities in residential area. Especially, modern people arc used to live under artificial light interior surroundings for much time. Currently, the average illumination level of the present apartment is improving, but it still does not reach the recommended level because the present apartment's luminous environment is only based on the life behavior which puts its priority to clear vision. Therefore, it is necessary that proper standard illumination must be used for various use and purpose. From this point of view, this paper investigated the essence of light in the residential area and the luminous environment for apartments was measured. This paper finally suggested well-coordinated lighting condition, derived from the measurement and analysis of luminous environment in these cases.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2242-2244
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• 1999

Recently, An important research field of pulsed power is high voltage, high power generation with exploding wire opening switch. Another point of view exploding wire effects have been researched for generation of the pulsed high pressure shock wave. Theoretical considerations of the shock pressure generation along with experiment results are presented in this paper and. Some experimental results of hard rock fracturing show the possibilities of commercial using.

• Journal of Welding and Joining
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• 제21권3호
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• pp.35-39
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• 2003

Laser welding has good characteristics such as high density energy, high speed and short heating time, as compared with conventional arc welding. The joint of laser welding also has good mechanical characteristics in general. However, relevant research is not sufficient to understand laser welding in the view point of mechanics until a recent date. In this paper, numerical simulation has been conducted to analyze distribution of welding residual stresses. Welding residual stresses of specimen have been measured by using sectioning method to compare the results between simulation and experiment.

• Spatial Information Research
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• 제9권2호
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• pp.291-307
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• 2001

오늘날 환경공학분야에서는 지표상의 유체와 오염물질 흐름에 대한 화학적·생물학적 프로세스를 보다 정확하고 효과적으로 파악하기 위하여 GIS 기법을 적용하는 연구가 활발히 진행되고 있다. 그러나, 공간적으로 표현되는 지표오염부하와 호수·하천 프로세스 간의 연계는 상대적으로 미흡한 실정이다. 이러한 연속성의 부재로 인하여 공간적인 오염원 특성과 수질모델의 연계 방안이 요구되고 있다. 본 연구의 목적은 GIS 소프트웨어인 Arcview와 USEPA의 수질 모델인 WASP5를 양방향으로 연계하여 오염부하와 수질모델의 입·출력 관계를 구현하는 것이다. 연구의 범위는 연구 동향 및 사례 분석, GIS를 이용한 점오염부하 및 비점오염부하 산출, WASP5 모델링, GIS와 모델의 연계 등을 포함한다. 본 연구는 GIS를 이용한 전처리(수질모델 입력 자료 생성), WASP5 수질 모델링, GIS를 이용한 후처리(수질 모델링 결과 출력)의 절차로 수행되었다. 전처리 단계에서는 소유역별 오염부하량을 산정한 후, 격자 분석 등을 통하여 모델링의 기본 단위가되는 세그먼트를 분할하고 각 세그먼트로 유입되는 경계농도를 산출하였다. 그리고 WASP5 수질 모델링 단계에서는 실측치를 이용하여 모델을 보정하고 모델링 결과를 분석하였다. 마지막으로 후처리 단계에서는 모델 결과를 GIS 형태의 자료로 변환하고, 이를 그래프나 주제도 형태로 표현하였다. 본 연구에서 구현된 인터페이스는 수질 관리를 위한 기본적인 환경을 제공하기 때문에 수질 정책 수립이나 의사 결정에 효과적으로 사용될 수 있을 것으로 기대된다.

• 대한조선학회논문집
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• 제48권1호
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• pp.76-83
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• 2011

FCAW(Flux Cored Arc Welding) is a widely used welding method in shipbuilding. It also conducts WPS(Welding Procedure Specification) requested by the classification variations of the factors which affect the quality on the welded area such as thickness of base metal, type of welding wire and shielding gas etc. which has to be satisfied. CO2 is commonly used as a shielding gas for FCAW due to the economic point of view. The amount of shielding gas is stated when classification certify WPS. However, the shielding gas is unnecessarily used at the shipyard leaning only on the welder's experience as there are classification standards for using the shielding gas. It causes production cost to rise. Also recently, CO2 is a main contributor for global warming, and large amounts of CO2 are discharged into the atmosphere during shipbuilding processes without any filtration. Therefore it was confirmed by the security of the welded area as a result of conducting the destructive and non-destructive tests with setting up the factors and the standards by using the Taguchi method. Then the FCAW shielding gas's amounts were calculated precisely when assembling a ship. It will be applied to cost reduction and prevention of environmental pollution at the shipyard.

• 대한기계학회논문집A
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• 제34권7호
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• pp.891-896
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• 2010

제로터는 유압모터나 펌프뿐만 아니라 조향장치인 파워 스티어링 유닛(PSU)에도 사용된다. 제로터의 내치차는 일상적인 경우 단일 원호형상의 외치차에 의하여 생성된다. 본 논문에서 PSU의 특성 개선을 위하여 보다 일반화 된 외치차의 형상으로부터 내치차를 생성하는 방법을 해석하였다. 해석의 결과로서, 외치차의 형상곡선이 특별한 2중곡률을 갖는 원호인 경우에 대하여, 내치차의 형상과 곡률, 제로터의 유량 및 접촉점의 위치와 슬립속도 등의 설계자료를 구하여 제시하였다. 이러한 해석은 새로운 PSU의 개발과 소형화를 가능케 한다.

• 터널과지하공간
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• 제17권5호
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• pp.360-371
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• 2007

이 논문은 GIS 기반의 수리학적 모델링을 통하여 시공측면에서 효과적으로 지표수를 제어하여 배수제어와 사면의 안정성에서의 적용에 관한 것이다. 본 논문에서는 인도네시아 파시르 노천광을 대상으로 연구를 수행한 결과를 제시한다. 신뢰할 수 있는 DEM 자료의 획득을 위하여 상세한 지형측량이 이루어 졌으며, DEM 자료로 부터 빗물의 흐름방향, 누적 흐름양, 집수구역 등의 배수 시스템의 특성을 도출하기 위하여 ArcGIS 9.1 소프트웨어가 제공하는 Hydrology 분석 도구를 사용하였다. 수리학적 모델링과 지형적인 분석의 결과는 현재의 배수처리 설비가 적당하지 않으며 또한 집중되는 지표수의 흐름으로 벤치사면에서 많은 침식이 일어날 수 있음을 보여주고 있다. 마지막으로 배수설비설계의 최적화와 물의 흐름의 제어를 통한 사면의 안전성의 증가와 사면을 감시하기 위한 방법을 제시하였다.

• 산경연구논집
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• 제9권8호
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• pp.27-34
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• 2018

Purpose - This paper discussed and illustrated the most efficient method to calculate the distribution centers for a national project in China. Through demonstration of implementing the GIS, spatial analysis, and location calculation model, this paper mainly dealt with the construction distribution problem and inconvenient supply of materials problems. Research design, data, and methodology - In this paper, the research design structure based on three steps: implementing the Geographic Information System to locate the points coordination data, calculating the distribution centers of the project, and optimizing the most efficient and effective coordination. The data of the calculation is from an actual project. The methodology of this paper is summarizing the spatial analysis capabilities and digital graphic data calculation to locate logistics distribution centers, and since the illustration of the calculation is useful for locating the coordination, the result of this paper has certain reference values for the project construction. Results - This paper illustrates the steel and cement resource of every distribution point to confirm the most efficient distribution center location coordination. Conclusions - The integrated logistical management models are used to ensure the results for the purposes of our calculation. The result of the calculation is also a useful example for future Chinese national projects.

• The Korean Journal of Ecology
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• 제24권4호
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• pp.253-258
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• 2001

Land use pattern in the Wangsuk river watershed was investigated on the bases of physiognomic vegetation maps made from the aerial photograph interpretation and field check. Landscape structure was analyzed using a GIS program supported by ArcView. Landscape structure depended on the geographical position of the river, such as the upper, middle and lower river. Watersheds of the upper and middle rivers were dominated by forests composed of secondary forest and plantation. But agricultural fields dominated that of the middle and lower river. Urban area and agricultural fields increased in from the upper toward the lower river watersheds. In addition to, a transformation of agricultural pattern into an institutional agriculture was characteristic in the middle and lower river basins. Water qualities of the Wangsuk river were usually better in the order of the upper, middle, and lower river, but they were fluctuated according to the site. Such fluctuation would due to self-purification of the river and land use pattern of the watershed as the non-point source. In this viewpoint, a strategy to manage the water quality in the level of watershed is urgently required.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.536-540
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• 2003

A new concept of adaptive focusing, using a Rotman lens, is presented in this paper. A Rotman lens is a microwave lens which is able to focus microwave power on its focal arc or generate multiple beams. By adding the array of phase shifters between a Rotman lens and antenna elements, the wavefront can be adaptively modulated to focus objects distributed in short range rather than far-field zone. From the optical point of view, the propagations of the lens have been simplified from the Fresnel diffraction integral to the Fourier transform. Using Fourier Transform, a beam propagation method has been developed to show improvement of the resolution by controlling wavefront of wave propagating from an aperture-type antenna array. The beam width(or spot size) and intensity have been calculated for a focused beam propagating from an array having $10{\lambda}$ of its size. For the beam with $20{\lambda},\;30{\lambda}$, and $50{\lambda}$ of geometrical focal length, the half-power beamwidth (spot size) is about $1.1{\lambda},\;1.3{\lambda}$, and $1.9{\lambda}$, respectively.