• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 추계학술발표대회 논문집
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• pp.310-313
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• 2008

The wind resource potentials of South Korea are estimated as preliminary stage using the national wind map which has been being established by numerical wind simulation and GIS (Geographical Information System) exclusion analysis. The wind resource potentials are classifying into theoretical, geographical, technical and implementation potentials and the calculation results are verified by comparing to other countries' potentials. In GIS exclusion, urban, road, water body, national parks and steep slope area are excluded from onshore geographical potential while water depth and offshore distance from the shoreline are applied s offshore exclusion conditions. To estimate implementation potential, dissemination records of European countries are adopted which is about 1/8 of geographical potential.

• Journal of Mechanical Science and Technology
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• 제16권3호
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• pp.302-309
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• 2002

This paper presents a technique for localization of a mobile robot using sonar sensors. Localization is the continual provision of knowledges of position that are deduced from its a priori position estimation. The environment of a robot is modeled by a two-dimensional grid map. We define a physically based sonar sensor model and employ an extended Kalman filter to estimate positions of the robot. Since the approach does not rely on an exact geometric model of an object, it is very simple and offers sufficient generality such that integration with concurrent mapping and localizing can be achieved without major modifications. The performance and simplicity of the approach are demonstrated with the results produced by sets of experiments using a mobile robot equipped with sonar sensors.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2011년도 춘계학술대회 논문집
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• pp.347-350
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• 2011

Automobiles should be light and practical to reduce the price of manufacturing and maintaining expense. Hatchback vehicles are far from the silence for its practicality. This paper introduced the effective method of the planning of the asphalt material which applies the asphalt damping material. This paper showed the experiment which restrains the vibration of the vehicle trunk using asphalt damping material and chose the position of damping material using the velocity map and strain energy map and planed the optimum position.

• 한국컴퓨터정보학회논문지
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• 제20권12호
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• pp.29-36
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• 2015

In this paper, we propose the horizontal line detection using the Haar-like features and linear regression in infrared images. In the marine environment horizon image is very useful information on a variety of systems. In the proposed method Haar-like features it was noted that the standard deviation be calculated in real time on a static area. Based on the pixel position, calculating the standard deviation of the around area in real time and, if the reaction is to filter out the largest pixel can get the energy map of the area containing the straight horizontal line. In order to select a horizontal line of pixels from the energy map, we applied the linear regression, calculating a linear fit to the transverse horizontal line across the image to select the candidate optimal horizontal. The proposed method was carried out in a horizontal line detecting real infrared image experiment for day and night, it was confirmed the excellent detection results than the legacy methods.

• Nuclear Engineering and Technology
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• 제52권11호
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• pp.2442-2451
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• 2020

The safety level of Sodium Fast Reactors is directly related with the sodium void reactivity. A low-void effect design has been proposed within the Horizon2020 ESFR-SMART project thanks to the introduction of a sodium plenum above the active core. In order to assess the impact of this core conception on transient analysis, a map with the spatial distribution of sodium void worth can be computed and fed into a point-kinetics-based transient code. Due to the spatial correlations between neighboring zones, the global effect of voiding two different axial or radial regions is not necessarily the sum of both individual contributions. Neglecting those correlations in the void worth map and consequently in the transient analysis may lead to an unrealistic prediction of the transient sequences. In this work, a method based on sensitivity analysis and similarity assessment is proposed for predicting those correlations. The method proved to be able to establish correlations between axial slices of a sub-assembly and was checked against realistic sodium void propagation patterns.

• 융합신호처리학회논문지
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• 제1권2호
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• pp.138-144
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• 2000

본 논문은 레이더 시스템에서 추적 제적을 갱신하기 위해서 측정값을 할당할 때의 관계를 결합 행렬식으로 표현하여 찾는 최적기법을 연구한다. 이를 위하여 클러터의 분포를 Gibbs의 분포로 가정하고서 마코프 랜덤필드를 이용하여 관계식을 유도하였다. 유도된 식은 MAP 추정기 형태를 갖고 이를 계산하기 위하여 제한사항을 고려한 Lagranglan 방법을 사용하였다.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제6권1호
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• pp.53-57
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• 2002

In this paper we give an example of energy minimizing harmonic maps for which the set of singular points are two or more lines intersecting at a point.

• 한국지열·수열에너지학회논문집
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• 제7권1호
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• pp.65-71
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• 2011

Recently, central and local governments of Korea have established and implemented various energy policies such as making energy map of city level and establishment of environment friendly city plan to materialize low carbon green city. To implement effectively these policies, however, conditions of energy consumption by each administrative district and each usage have to be verified exactly. This study is aimed to suggest a basic data for planing energy policy and energy demand prediction of city level by analyzing energy consumption unit and conditions of city gas by borough and usage in Busan.

• Corrosion Science and Technology
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• 제10권2호
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• pp.52-59
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• 2011

Corrosion of metallic materials occurs by the reaction with corrosive environment such as atmosphere, marine, soil, urban, high temperature etc. In general, reduction of thickness and cracking and degradation are resulted from corrosion. Corrosion in all industrial facilities and infrastructure causes large economic losses as well as a large number of accidents. Economic loss by corrosion has been reported to be nearly 1-6% of GNP or GDP. In order to reduce corrosion damage of industrial facilities, corrosion map as well as a systematic investigation of the loss of corrosion in each industrial sector is needed. The Corrosion Science Society of Korea in collaboration with 15 universities and institutes has started to survey on the cost of corrosion and corrosion map of Korea since 2005. This work presents the results of the survey on cost of corrosion by Uhlig, Hoar, and input-output methods, and the evaluation of atmospheric corrosion rate of carbon steel, weathering steel, galvanized steel, copper, and aluminum in Korea. The total corrosion cost was estimated in terms of the percentage of the GDP of industry sectors and the total GDP of Korea. According to the result of Input/output method, corrosion cost of Korea was calculated as 2.9% to GDP (2005). Time of wetness was shown to be categories 3 to 4 in all exposure areas. A definite seasonal difference was observed in Korea. In summer and fall, time of wetness was higher than in other seasons. Because of short exposure period (12 months), significant corrosion trends depending upon materials and exposure corrosion environments were not revealed even though increased mass loss and decreased corrosion rate by exposure time.

• 한국가스학회지
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• 제14권4호
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• pp.6-11
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• 2010

연구실험실 사고 방지를 위하여 2005년 연구실 안전환경조성에 관한 법률이 법제화되어 국내 대학 또는 국공립출연연구소나 기업부설 연구소 실험실에서는 안전관리시스템을 구축하고, 안전점검과 정밀안전진단을 실시하고 있음에도 불구하고 폭발, 화재 등 각종 대형 사고가 지속적으로 발생하여 연구 활동 종사자의 인명 피해와 재산 손실이 상당한 수준에 이르고 있다. 또한 연구실험실에서 발생하는 사고는 유사한 내용으로 반복적으로 발생되고 있으므로 이러한 사고의 원인분석과 재발 방지를 위한 안전관리 대책이 시급하다. 따라서 본 논문에서는 국내 해외 대학 또는 국공립출연 연구소나 기업 부설 연구소 실험실에서 발생한 사건 사고에 대해 Root Cause Analysis 기법을 이용하여 사고원인 조사 결과를 보여주고, 이에 따른 실험실 사고원인 조사 분류 Map과 개선사항을 제시하여 연구실험실의 안전관리를 향상시키고자 한다.