• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2013년도 춘계학술대회 논문집
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• pp.179-179
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• 2013

Surface resistance of electro-deposited copper with its thickness, current density and surface roughness was determined by using a 4-point probe analyzer. The copper was prepared electrochemically on 316 stainless steel substrate in copper sulfate solution at the condition of $1A/dm^2$, 298 K, and 6.5 cm-electrode distance. The surface resistance of the copper sheet in the range of $0.93-0.97{\Omega}$ increased with the copper thickness in the range of $21-70{\mu}m$. The surface resistance in the range of $0.963-1.009{\Omega}$ also increased with current density in the range of $0.5-2A/dm^2$. The increased surface resistances corresponded to 11% for thickness and 25% for current density, respectively.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.375-378
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• 1997

This research deals with a problem of reconstructing 3D surface structures from their 2D projections, which is an important research topic in computer vision. In order to provide robust reconstruction algorithm, that is reliable even in the presence of uncertainty in the range images, we first present a detailed model and analysis of several error sources and their effects on measuring three-dimensional surface properties using the space encoded range imaging technique. Our approach has two key elements. The first is the error modeling for the space encoding range sensor and its propagation to the 3D surface reconstruction problem. The second key element in our approach is the algorithm for removing outliers in the range image. Such analyses, to our knowledge, have never attempted before. Experimental results show that our approach is significantly reliable.

• 한국세라믹학회지
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• 제13권3호
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• pp.3-12
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• 1976

The corelation between surface tensions and surface appearances of SK O5a opaque glazes for earthen wares were investigated. The surface tension values were theoretically calculated by using Dietzel's factors of constituent oxides of glaze. The surface appearances of glazes, especially the pinhole phenomena were strongly effected by the surface tension values showing the following general tendencies: (1) In the range of 305±3 dynes/cm of surface tensions, glazes showed almost no pjnholes. (2) In the range of surface tensions less than 300 dynes/cm, the large numbers of small pinholes or eggshell textures were observed. (3) In the range of surface tensions higher than 310 dynes/cm, large and deep pinholes were observed. (4) The contact angles of glazes on the wall tile body substrate are in the good proportional agreement with the surface tension values calculated by Dietzel's factors.

• 전기학회논문지
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• 제61권4호
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• pp.639-642
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• 2012

Optical coherence tomography(OCT) can provide real-time and non-invasive subsurface imaging with ultra-high resolution of micrometer scale. However, conventional OCT systems generally have a limited imaging depth range within a depth of only 1-2 mm. To overcome the limitation, we have proposed an active surface tracking algorithm used in common-path Fourier-domain OCT system in order to extend the imaging depth range. The surface tracking algorithm based on the threshold and Savitzky-Golay filter of A-scan data was applied to real-time tracking. The algorithm has controlled a moving stage according to the sample's surface variance in real time. An OCT image obtained by the algorithm clearly show an extended imaging depth range. Consequently, the proposed algorithm demonstrated the potential for improving the conventional OCT systems with limitary depth range.

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 2002년도 전지기술심포지움
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• pp.57-65
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• 2002

The presence of tetragonal phase at the surface of $LiMn_2O_4$ pinicle due to a Jahn-Teller offset was previously reported to be one of the causes for capacity fading observed during cycling of $Li//Li_xMn_2O_4$ in 4V range. Further, it is reported that a Jahn-Teller effect in 4V range may be suppressed by substitution of Mn ions with Li ions or other transition metal ions. However, the direct evidence of the suppression of a Jahn-Teller effect in 4V range by substitution of Mn ions with other metal ions has not been reported. The dissolution and formation of surface film at the surface of $LiMn_2O_4$ electrodes also reportedly affect the capacity fading or rate capability. This study reports on the evidence of the onset and suppression of a Jahn-Teller effect in 4V range and the dissolution and formation of surface film at the surface of $LiMn_2O_4$ thin film electrodes using in situ bending beam method (BBM) in situ electrochemical quartz crystal microbalance (EQCM).

• 대한원격탐사학회지
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• 제33권3호
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• pp.313-324
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• 2017

미래 인류의 달 기지 설치 후보인 달 용암 동굴은 지형 카메라의 관측 자료를 통해 탐사가 수행되었지만 이는 달 용암 동굴의 존재에 대한 확실한 증거를 제시하지 못한다. 본 연구에서는 지표 투과가 가능한 High Frequency (HF) 레이더의 달 관측 자료를 이용하여 달 용암 동굴 탐사를 시도하였다. 이를 위해 일본 달 탐사선 Kaguya의 Lunar Radar Sounder (LRS)의 관측 자료에서 LRS에서 가장 강한 반사파 펄스가 나발생되는 지점까지의 거리인 LRS 표면 레인지가 추출되었다. 달 용암 동굴은 얕은 지하에 분포하고 LRS의 거리 분해능은 얕은 지하에 있는 목표물의 반사파와 표면 반사파는 분리 할 수 없다. 이로 인하여 달 얕은 지하에 구조물이 있는 경우 일반적인 달 표면의 위치가 실제 달 표면과 다르게 나타난다. 이에 따라 LRS 펄스의 낮은 거리 분해능을 이용하여 LRS 표면 레인지로부터 얕은 지하에 존재하는 달 용암 동굴 검출이 가능하다. LRS 표면 레인지에서 Kaguya의 궤도 고도를 제하면 달 표면 고도가 나타나고 이를 달 지형 고도를 나타내는 Kaguya Digital Terrain Model (DTM) 데이터로부터 도출된 DTM 평균 지형 고도와 비교 분석하여 달 용암 동굴을 검출한다. 이러한 분석 방법을 Rima Galilaei의 북쪽에 위치한 달 용암 동굴 후보지에 적용하여 LRS 지형 고도 값과 DTM 평균 지형 고도 값의 차이를 발견하였고 검출된 차이가 천부 지하에 존재하는 달 용암 동굴의 반사파로 인하여 생긴 것으로 추정하였다.

• 전자공학회논문지S
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• 제34S권6호
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• pp.58-66
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• 1997

This paper proposes a multiresolution surface parameter estimation method for range images. Based on robust estimation of surface parameters, it approximates a patch to a planar surface in the locally adaptive window. Selection of resolution is made pixelwise by comparing a locally computed homogeneity measure with th eglobal threshold determined by te distribution of the approximation error. The proposed multiresolution surface parameter estimation method is applied to range image reconstruction. Computer simulation results with noisy rnag eimages contaminated by additive gaussian noise and impulse noise show that the proposed multiresolution reconstruction method well preserves step and roof edges compared with the conventional methods. Also the segmentation method based on the estimated surface parameters is shown to be robust to noise.

• 한국군사과학기술학회지
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• 제27권4호
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• pp.466-473
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• 2024

An Emergency Destruction System is inevitable for ensuring safety both at sea and in populated areas, particularly during emergency detonations triggered by abnormal missile flight or upon mission completion. This paper introduces a novel method for developing an Emergency Destruction System capable of precisely calculating the Instantaneous Impact Point(IIP) during high-speed, maneuverable long-range surface-to-air missile flight tests. The Emergency Destruction System designed for long-range surface-to-air missile flight tests generates impact position tables that meticulously incorporate wind errors and navigation equations based on the Earth's ellipsoidal model. Factors such as the Coriolis effect and the direction of the gravitational acceleration vector are accounted for, significantly enhancing the accuracy of IIP determination amidst highly variable missile speed and attitude.

• 한국재료학회지
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• 제23권6호
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• pp.322-328
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• 2013

The relationship the between electrical properties and surface roughness (Ra) of a wet-etched silicon wafer were studied. Ra was measured by an alpha-step process and atomic force microscopy (AFM) while varying the measuring range $10{\times}10$, $40{\times}40$, and $1000{\times}1000{\mu}m$. The resistivity was measured by assessing the surface resistance using a four-point probe method. The relationship between the resistivity and Ra was explained in terms of the surface roughness. The minimum error value between the experimental and theoretical resistivities was 4.23% when the Ra was in a range of $10{\times}10{\mu}m$ according to AFM measurement. The maximum error value was 14.09% when the Ra was in a range of $40{\times}40{\mu}m$ according to AFM measurement. Thus, the resistivity could be estimated when the Ra was in a narrow range.

• 대한전자공학회논문지
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• 제27권8호
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• pp.1275-1283
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• 1990

Perception of surfaces from range images plays a key role in 3-D object recognition. Recognition of 3-D objects from range images is performed by matching the perceived surface descriptions with stored object models. The first step of the 3-d object recognition from range images is image segmentation. In this paper, an approach for segmenting 3-D range images into symbolic surface descriptions using spatial Gabor filter is proposed. Since the phase of data has a lot of important information, the phase information with magnitude information can effectively segment the range imagery into regions satisfying a common homogeneity criterion. The phase and magnitude of Gabor filter can represent a unique featur vector at a point of range data. As a result, range images are trnasformed into feature vectors in 3-parameter representation. The methods not only to extract meaningful features but also to classify a patch information from range images is presented.