• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1998년도 추계학술대회
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• pp.179-180
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• 1998

In this paper, we propose an algorithm to detect fetal movements using M-mode ultrasonography. To do this work automatically, we find the crosscorrelation between the current data vector of the depth direction of M-mode image and the previous one. In the crosscorrelation estimator, the variations of time lag $\tau$ at maximum crosscorrelation value means fetal movements. A woman in the 37th week of pregnancy was monitored and the ultrasonic image of fetus was recorded over 20-minute period to detect fetal movements using B-mode and M-mode ultrasonography simultaneously. And the presented method was compared with maternal perception and B-mode ultrasonography observed by clinician. The maternal perception method detected only 57% of all fetal movements observed by clinician. The detection of the presented method corresponds to the clinician's detection result.

• 한국정밀공학회지
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• 제12권5호
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• pp.69-76
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• 1995

This paper describes characteristics of EDT(Electro Discharge Texturing) and that the strip surface has influence on the paintability. The pulse mode and the capacitor mode of recently developed EDT method were investigated about the peak shape and the roughness of strip surface. And EDT method compared the above-mentioned contents with the SBT(Shot Blast Texturing) method. The peak count of the pulse mode is more than that of the capacitor mode. But the lower roughness below the Ra 3.2 .mu. m of the strip surface, the texturing time of the pulse mode is longer than the capacitor mode. In SBT method, the peak shape is similar to capacitor mode. But the EDT roll has more uniformity than the SBT roll and has more peak count than that of SBT roll. Therefore, in the painted steel sheet, EDT roll gives better surface of clarity image than the SBT roll.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.800-803
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• 2006

The Space-borne electro-optical camera system, like KOMPSAT has panchromatic redundant image channel as well as primary channel in order to increase reliability of satellite system. In most case redundant channel never been used during the whole mission period. Staggered array configuration using redundant image channel and new operation mode proposed which operates primary and redundant channel simultaneously. Without new hardware design, fast electronics and system complexity, we can get 1.414 times more fine GSD image of original system and aliasing effect which corrupt high frequency information of image can be minimized. To get the more efficiency from staggered array configuration, we introduce masked pixel CCD.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.203-206
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• 2007

The Space-borne electro-optical camera system has panchromatic redundant image channel as well as primary channel in order to increase reliability of satellite system. In most case redundant channel never been used during the whole mission period. Staggered array configuration using redundant image channel and new operation mode proposed which operates primary and redundant channel simultaneously. Without new hardware design, fast electronics and system complexity, we can get 1.414 times more fine GSD image of original system or we can get 1.414 times more SNR or High dynamic range imaging mode. In this paper we deal with several image quality improvement methods using dual panchromatic channel.

• 대한전기학회논문지
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• 제45권2호
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• pp.310-318
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• 1996

It is very important for a mobile robot to estimate its current position With precise information about the current position, the mobile robot can do path-planning or environmental map building successfully. In this paper, a position estimation method using one color image is presented. The mobile robot(K2A) takes an image of a corridor and searches for the door and pillar, which are the given landmarks. The color information is used to distinguish the landmarks. In order to represent the presence of the landmarks, Image Mode is defined. This method adopts Kullback information distance. If a landmark is detected, with the color information, the mobile robot identifies the vertical line of the landmark and its crossing point and an experimental navigation is performed.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.224-229
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• 2009

Digital image recognition has been used for steel bridge surface assessment since late 1990s. However, the non-uniform illumination problems such as shades, shadows, and highlights are still challenges in image processing to date. Therefore, this paper develops a new approach to tackle the non-uniform illumination problem for rust image adjustment. The inhomogeneous illumination problem is divided into shades/shadows and highlights in this paper. The proposed BEMD-morphology approach (BMA) utilizes the bidimensional empirical mode decomposition to mitigate the shade/shadow effect, and the morphological processing to detect and replace the highlight area. Finally, the rust image processed with the BMA will be segmented by the K-Means algorithm, one of the most popular and effective methods, to show the effectiveness of illumination adjustment.

• 방송공학회논문지
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• 제9권3호
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• pp.214-224
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• 2004

본 논문에서는 차세대 실감형 3차원 영상 처리와 3차원 TV 3차원 화상회의 등과 같은 3차원 실감 미디어의 부호화에 적합한 H.264 기반의 적응적 시공간적 예측 부호화를 제안한다. 첫 번째로, 두 가지의 IPPP와 IBBP GOP(group of picture) 구조에서 기존의 동시방송(simulcast) 방식과 다르게 same-view와 inter-view 영상의 적응적 시공간적 예측 부호화를 제안한다. 두 번째로, GOP 구조가 IBBP에서 제안된 inter-view 방식의 예측 부호화시 B(hi-predictive) 화면이 MB(macroblock) 모드중 하나인 시간적 직접방식(temporal direct mode)을 수행하려고 할 때 참조 화면이 inter-view 영상을 참조하는 경우 현재의 시간적 직접 방식을 효율적으로 수행하기 위해서 2차원 inter-view 직접 방식을 제안한다. 제안된 방식은 실험결과에서 기존의 동시방송 방식과 비교되었으며 각각의 GOP 구조 모두 화질 면에서 우수한 결과를 확인할 수 있었다.

• 융합신호처리학회논문지
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• 제10권4호
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• pp.267-273
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• 2009

본 논문은 WDR(Wide Dynamic Range)의 구현을 위한, 나눗셈기를 사용하지 않은 가변적 평균기의 설계에 관한 것이다. 이전에 제안하였던 평균기 [5]는 나눗셈기를 곱셈기로 대체함으로써 하드웨어의 복잡도 및 하드웨어 자원의 효율성을 향상시켰다. 하지만 기존에 제안한 구조는 가로와 세로의 길이를 측정하고, 사용자에 의해 Mode에 설정되어 있는 기본 영상의 크기와 정확히 일치할 경우에만 동작이 가능하다는 단점이 있었다. 본 논문은 이러한 기존 평균기의 단점을 보완하기 위하여, 영상의 전체 크기를 이용하여 Mode를 선택하도록 하였다. 또한 특정 크기의 영상에만 적용되는 것이 아니라 다양한 크기의 영상에 대해서도 적용 가능하도록 제안한다. 특히, 보다 정확한 평균값을 구하기 위하여 외부 보상 값을 추가하였다. Verilog-HDL을 이용하여 설계하였으며, 합성결과를 통해 Serial multiplier의 구조가 좀 더 하드웨어 크기와 자원의 효율성이 높은 것을 확인하였다.

• 한국의류학회지
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• 제45권5호
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• pp.907-921
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• 2021

This study aims to predict causal relationships between experience economy, perceived flow, and continuous use intention in the mixed reality (MR) environment. A virtual fitting mirror with two modes (i.e., avatar and self-image) was selected for this study. A total of 200 samples was obtained in two sample frames: virtual fitting users in avatar mode (group 1, n = 119) and self-image mode (group 2, n = 81). The results showed that the experience economy consists of entertainment, education, esthetic, and escapism. The entertainment and esthetic experiences had positive effects on perceived flow, leading to continuous use intentions. For avatar mode, the entertainment and esthetic experiences had positive effects on continuous use intentions through the mediating effect of flow; and the education experience had a positive effect on the continuous intentions to use the MR technology. For self-image mode, the flow mediated the effect of entertainment on continuous use intentions, whereas education and escapism directly affected the intention to use the MR technology. The paper also discusses the theoretical and managerial implications of using MR technologies in fashion retailing.

• 한국대기환경학회지
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• 제15권2호
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• pp.175-182
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• 1999

Scanning electron microscopy (SEM) has played an important role in receptor modeling area because it is a powerful tool for characterizing individual particles. The purpose of the study was to classify individual diesel particles base on statistical analysis and image analysis by SEM/EDX (energy dispersive x-ray analyser). The diesel particles were sampled by both a modified CVS 75 mode and a high speed mode with a chassis dynamometer. The SEM/EDX system provides various physical parameters including particle's particle diameter and chemical information. Thus density and mass of the diesel particle were estimated cased on its chemical composition and further fractal dimensions of the diesel particle were obtained by the Hurst exponent method. The fractal dimension in the sample of modified CVS 75 mode was higher than the high speed mode. Finally, mass fractions for a diesel vehicle as a source profile were estimated cased on a particle class concept.