• 열처리공학회지
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• 제16권4호
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• pp.197-204
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• 2003

Honeycomb structure has been fabricated by brazing method using 0.1 wt%C and 1.0wt%C carbon steel core and STS304 stainless steel face sheet. Core shear strength ratio in W and L directions was 1:1.03 in 7 mm cell size, whereas 1:1.45 in 4 mm cell size. Flexural strength on face sheet was 166.4 MPa (0.1 wt%C, W direction), 171.1 MPa (0.1 wt%C, L direction), and 120.2 MPa (1.0 wt%C, W direction) in 7 mm cell size. And in 4mm cell size specimen, it was 169.2 MPa (0.1 wt%C, W direction), 224.2 MPa (0.1 wt%C, L direction). This means that flexural strength of 0.1 wt%C core material was higher than that of 1.0wt%C core material, which was contrary to expectation. SEM and EDS analysis represented that grain boundary diffusion had occurred in0.1 wt%C core, but no grain boundary diffusion in 1.0 wt%C core. And corrugated surface of 0.1 wt%C core was flat, whereas that of 1.0 wt%C core was not flat. As a result, contact area between two 1.0 wt%C cores was much less than that of 0.1 wt% cores, It is thought to be main reason for lower flexural strength of 1.0 wt%C core.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.676-683
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• 2008

It is developed in domestic and position Tilting train's Onboard Cabsignal system at the car of the train follows in the route which comes to be applied and application environment and the scope of function and application of equipment is different applied. The development direction of signal equipment at the domestic car must secure the maintenance conservativeness and a fundamental technique of hereafter. It will reach and to respect standardization of technical power it leads and must be applied development or. Consequently, Domestic it is developed tilting it investigates the application scope of the train. It investigates the development direction of signal equipment at the hereafter car. Currently it researches the signal equipment of top of head of a family enemy conditions grudge. Also, It was improved the scope of application function in following and it considered it researched the quality thing and the signal equipment at the car.

• 한국CDE학회논문집
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• 제14권6호
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• pp.355-363
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• 2009

The purpose of this study is to suggest development direction of open BIM. To achieve this purpose, the authors have investigated application status and current problems of open BIM through question survey to design firm which is introducing or plan BIM. In addition, the authors have suggested improvement way about current problems of BIM application such as BIM standard guide, reference of practical application examples, BIM library, data interoperability between software, improvement of BIM software function and performance that is deducted through question survey.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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• pp.1525-1526
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• 2006

Electrical current always travels through the minimum resistance path. In this paper, we are studied on the direction and formation of carbonized conductive path according to surface leakage between electrodes. The analysis of characteristics of the arc discharge as surface is broken down between exposed live parts. Using the HSIS(high speed imaging system, 100,000fps, redlake ltd., USA), it took photographs by arc growth mechanism occurred in on/off surge, ground fault and discharge between electrodes. Therefore, it recommended for results of technology development and application such as theoretic verification of an arc direction and economic security according to a technology about connecting arc generation in surfaces of insulators. Hereafter, it expected effects that application of energy utility technology through the arc control.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 추계학술발표회 논문집
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• pp.217-222
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• 2004

In this study, cutting slope's digital image has acquired by using video camera attached at RC helicopter. Resulted RMSE from image processing was approximately x-direction 0.27m, y-direction 0.23m and z-direction 0.35m. Application of these methods makes it convenient that acquisition of digital image about before and after the construction work of road cutting slope. Also systematical cutting slope's information acquisition will be possible by cutting slope's quantitative and qualitative analysis.

• International Journal of Naval Architecture and Ocean Engineering
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• 제12권1호
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• pp.531-540
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• 2020

The whirl and generated forces of rotating cylinders with different diameters placed in still water and in flow are studied experimentally. For the rotating cylinders in still water, the Same Frequency Whirl (SFW) and Different Frequency Whirl (DFW) have been identified and illustrated. The corresponding SFW and DFW areas are divided. The Root Mean Square (RMS) values of the generated force coefficient dramatically increase in the defined ranges of Resonance I and Resonance II. For the rotating cylinders in flow, the hydrodynamics, SFW and DFW are illustrated. The hydrodynamic, SFW and DFW areas are divided. The RMS values of the generated forces in the range of Resonance II are much smaller than those in still water due to the generated lift forces. The discussion suggests that the frequency of the DFW may equal multiple times or one-multiple times that of the rotating frequency: the whirl direction of the DFW with multiple times the frequency of the rotating frequency is the same as the rotating direction. The whirl direction of the DFW with one-multiple times frequency of the rotating frequency is opposite to the rotating direction.

• Journal of the Korean Wood Science and Technology
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• 제31권3호
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• pp.50-60
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• 2003

The main purpose of this study was to propose the development direction and application method of wood as a landscape material by analysis and investigation of the present condition and characteristics of wood, which is a quite interesting natural material for its beauty as an exterior material. This study is based on the relationships between the establishment of development direction and practical use of exterior wood as a landscape material. The research method used was fieldwork and data analysis. On the analysis of the present condition of wood utilization, it was investigated to need of complement of a design aspect, use method, the limit of use type, and use range. The direction of a durable design for the practical use of exterior wood as landscape materials was established. On the use of exterior wood, first, the characteristics of wood have to be understood. Then exterior wood can be used while preserving its safety and beauty over a long time by physical and chemical treatment. At the same time, an application plan for the practical and effective use of wood as an outdoor landscape material, we concluded that future research in design aspects is needed in consideration of physical, chemical, and structural properties of durable wood materials used in outdoor facilities.

• 대한산업공학회지
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• 제32권4호
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• pp.253-267
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• 2006

Six sigma has been the most influential management innovation program in a number of leading companies and its application has extended beyond manufacturing processes for the past 10 years. However, numerous difficulties arise during the six sigma application to the various industries. In this study, the current situation of the six sigma applied to Korean companies is showed, and the issues of six sigma application in Korean companies are found. At the end, the several counter plans to overcome them. are proposed.

• 농약과학회지
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• 제11권1호
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• pp.32-37
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• 2007

항공방제시 비표적생물에 대한 안전거리를 설정하고자 벼의 주요 병해충인 도열병, 잎집무늬마름병, 벼멸구 및 나방류를 동시에 방제할수 있는 훼림존 트리싸이클라졸 액상수화제+비피유제+바리신액제와 헥사코나졸유제+이소란유제+파프유제의 3종 혼용농약을 항공 살포한 후 논물중 농약 잔류량과 수서생물 및 꿀벌에 미치는 영향을 조사하였다. 항공방제시 대상지역 이외의 포장으로 분무입자가 비산하는 정도는 바람부는 방향으로는 30 m, 반대방향으로는 20 m 이내로 비교적 비산 정도가 낮았다. 항공살포 후 살포지역내 논물중 농약의 잔류량을 조사한 결과 항공방제 6일후에는 논물 중에서는 농약이 검출되지 않았다. 항공방제 지역의 수서생물에 미치는 영향을 조사한 결과, 송사리와 미꾸라지는 방제지역 내외를 막론하고 모든 지점에서 치사되지 않았다. 물벼룩은 항공방제지역으로부터 10 m 지점 이내에 노출된 경우 48시간후 모두 치사되었으나 30 m 이상 지점에서는 영향이 없었다. 꿀벌은 바람부는 방향으로 50 m와 반대방향으로 20 m까지 $7{\sim}100%$ 치사하여 항공 방제시 안전거리는 수서생물의 경우 50 m, 꿀벌의 경우는 100 m로 설정하였다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2018년도 학술발표회
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• pp.325-325
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• 2018

The main purpose of this study is to suggest the more reliable flow direction methods within the framework of DEM by investigating the existing methodologies. To this end SFD(single flow direction method), MFD(multiple flow direction method) and IFD(Infinite flow direction method) are applied to determination of flow direction for water particles in Jeonjeokbigyo basin, and then assessed with respect to the variation of flow accumulation. As the main results the different patterns of flow accumulation are found out from each application of flow direction methods. As the flow dispersion increases on DEM contributing areas to outlet grow in sequence of SFD, IFD, MFD but contribution of individual pixels into outlet decreases. Especially MFD and IFD tend to make additional hydrologic abstraction from rainfall excess due to the flow dispersion within flow paths on DEM. Based on parameter estimation for power law distribution by maximum likelihood flow accumulation can be thought of as scale invariance factor. Combination of several flow direction methods could give rise to the more realistic water flow on DEM through separate treatment of flow direction methods for dispersion and aggregation effects of water flow within different topographies.