• 펄프종이기술
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• 제44권4호
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• pp.16-24
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• 2012

To characterize the coating structure, diverse methods such as mercury intrusion, nitrogen adsorption and oil absorption methods have been developed and widely employed. These indirect techniques, however, have some limitation to explain the actual coating structure. Recently microscopic observation methods have been tried for analyzing structural characteristics of coating layers. Preparation of the undamaged cross section of a coating layer is essential for obtaining high quality image for analysis. In this study, distortion-free cross-section of the coating layer was prepared using a grinding and polishing technique. The coated paper was embedded in epoxy resin and cured. After curing the resin block it was ground with abrasive papers and then polished with diamond particle suspension and nylon cloth. Polished coating layer was sufficient enough to obtain undamaged cross sectional images with scanning electron microscope under backscattered electron image mode. In addition, the SEM images allowed distinction of the coating layer components. Also S/B latex film formed between pigment particles was visualized by osmium tetroxide staining. Pore size distribution and pore orientation were evaluated by image analysis from SEM cross-sectional images.

• 한국산학기술학회논문지
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• 제15권5호
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• pp.3153-3158
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• 2014

스쿨존에서 빈번하게 발생하는 어린이 안전사고에 능동적으로 대처하기 위해서는 상황 인식에 대한 자동화된 모듈에 대한 연구가 필요하다. 스쿨존과 같은 지역에서 차량의 진입, 어린이의 객체 인식, 그리고 GPS 좌표 정보를 기반으로 감시 시나리오를 구축하여, 전략화된 시나리오에 맞는 상황이 발생되었다고 판단되면 스쿨존 안전도를 높이기 위해 이에 대한 조치를 취하게 된다. 본 논문에서는 GPS 센서와 영상센서 그리고 네트워크에 연결된 모니터링 서버와의 통합을 기반으로 상황인식 방안을 연구하였다. 영상센서 부문과 GPS분석부문을 통해 상황인식을 객체분석을 수행하고 시나리오에 기반한 상황에 따라 능동적으로 대처할 수 있는 방안을 제안한다.

• 대한원격탐사학회지
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• 제39권4호
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• pp.459-466
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• 2023

In the last decade, artificial intelligence's dramatic advancement with the development of various deep learning techniques has significantly contributed to remote sensing fields and satellite image applications. Among many prominent areas, super-resolution research has seen substantial growth with the release of several benchmark datasets and the rise of generative adversarial network-based studies. However, most previously published remote sensing benchmark datasets represent spatial resolution within approximately 10 meters, imposing limitations when directly applying for super-resolution of small objects with cm unit spatial resolution. Furthermore, if the dataset lacks a global spatial distribution and is specialized in particular land covers, the consequent lack of feature diversity can directly impact the quantitative performance and prevent the formation of robust foundation models. To overcome these issues, this paper proposes a method to generate benchmark datasets by simulating the modulation transfer functions of the sensor. The proposed approach leverages the simulation method with a solid theoretical foundation, notably recognized in image fusion. Additionally, the generated benchmark dataset is applied to state-of-the-art super-resolution base models for quantitative and visual analysis and discusses the shortcomings of the existing datasets. Through these efforts, we anticipate that the proposed benchmark dataset will facilitate various super-resolution research shortly in Korea.

• 전기학회논문지P
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• 제57권3호
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• pp.332-337
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• 2008

We analyzed carbonization pattern and crystal structure of polyvinyl chloride wire by thermal stress. Copper that is oxidized at normal temperature is a reddish brown. If under the thermal stress range of 500 to 700 [$^{\circ}C$], carbonization and exfoliation occurrence. Section structure of electric wire is same as arrangement of particle in metallograph analysis. But, as thermal stress increases, size of particle is enlarged. Electric wire displays elongation structure in SEM image analysis and elongation structure collapses when receive thermal stress at 300 [$^{\circ}C$]. In EDX analysis, we get the spectra of CuL, CuK, OK, and ClK. FT-IR analysis was shown new spectra with in range of $1,440{\sim}1,430\;[cm^{-1}]$, 1,340 [$cm^{-1}$], 1,240 [$cm^{-1}$].

• 대한가정학회지
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• 제44권5호
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• pp.109-118
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• 2006

The purpose of the study is to analyze web-site content for activating internet apparel shopping malls. With a view to improving the transaction experience and efficiency for both shopping-mall managers and customers. According to RANKEY(rankey.com) and 100 HOT RANHNC(100hot.co.kr), 5 big internet apparel shopping malls were chosen, divided into 3 web-site criteria of Users' Interface Section, Informational Section, and Customer Satisfaction Section, and analyzed. The results of our analysis of the web-site contents are as follows: 1) Concerning Users' Interface Section, the structure of the first screen is complicated and confusing. 2) Concerning Informational Section, the specific image of shopping man is ambiguous to understand and differentiated product information is not properly given. 3) Concerning Customer Satisfaction Section, the customers are not encouraged to show any interest in the shopping mall. These three problems are easily observed in most of the internet apparel shopping malls. To develop the internet apparel shopping mall, the following methods to activate them need to be implemented.

• 한국멀티미디어학회:학술대회논문집
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• 한국멀티미디어학회 2002년도 춘계학술발표논문집(상)
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• pp.145-148
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• 2002

본 논문에서는 관상동맥 질환의 객관적 분석을 위해, 혈관단면영상에서의 ROI(Lumen, Media, Plaque)에 대한 정확한 분할과 분할한 영역에서 질병을 유발시키는 요소들에 대한 정량적 분석을 위한 소프트웨어를 개발하였다. 본 시스템은 Visual C++ 6.0을 이용하여 개발하였으며, 현미경으로부터 획득한 관상동맥 단면영상에 적용하여 Lumen, Media와 Plaque를 분할하고, 각 영역의 형태학적 특징을 추출하여 분석 결과를 파일로 저장할 수 있도록 구현하였다. 분석된 결과는 심장질환의 객관적 진단을 위한 보조판단근거로써 사용될 것으로 기대한다.

• 방송공학회논문지
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• 제18권4호
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• pp.543-549
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• 2013

자율신경계 및 중추신경계 반응 신호는 취득 시 피험자의 움직임이 있는 경우 노이즈가 첨가되어 의도한 분석이 불가능하게 될 수 있다. 본 논문에서는 생리신호 취득시 피험자의 영상을 동시에 촬영 및 분석하고 움직임을 감지하여, 생리신호의 노이즈 구간을 정의하는 방법을 제안한다. 움직임 감지를 위해 시계열에서 영상 프레임간 1차 미분하고 임계치 이상 움직임이 발생했을 때를 해당 신호의 노이즈 발생 구간으로 정의하였다. 또한, 영상을 사용하지 않는 방법으로써, 수집된 신호를 주기 단위로 분석하여 길이와 높이를 특징으로 한 정상 신호를 2차원 가우시안 확률밀도함수로 모델화하여, 신호의 훼손 구간을 정의하는 방법을 제안한다. 두 방법으로 정의된 훼손 구간은 가우시안 함수를 기반으로 보간하였다. 광혈류량 신호에 적용한 결과, 심전도 신호에서 추출된 평균 심박간격에 가까운 수치로 복원됨을 확인하였다. 또한, 영상기반 방법은 정상구간을 훼손구간으로, 신호기반 방법은 훼손구간을 정상구간으로 잘못 인식하는 경우가 나타남을 확인하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.441-445
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• 2000

This study is to segment white matter, gray matter, and cerebrospinal fluid(CSF) on a brain MR image of coronal section and to calculate the volume of each. First, we segmented the whole region of a brain from a black colored background, a skull and a fat layer. Then, we calculated the partial volume of each component, which was present in scanning finite thickness, with the arithmetical analysis of gray value from the internal region of a brain showing the blurring effects on the basis of the MR image forming principle. Calculated partial volumes of white matter, gray matter and CSF were used to determine the threshold for the segmentation of each component on a brain MR image showing the blurring effects. Finally, the volumes of segmented white matter, gray matter, and CSF were calculated. The result of this study can be used as the objective diagnostic method to determine the degree of brain atrophy of patients who have neurodegenertive diseases such as Alzheimer’s disease and cerebral palsy.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.815-822
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• 2004

A knowledge of in situ stress state is important to design various engineering structures such as dams, tunnels and so on. There are about three wellknown indicators that is, borehole will breakouts, hydraulic fracturing, ellipsoidal cross section of borehole that have been attributed to the state of stress in the vicinity of borehole. Fortunately, Televiewer traveltime image can be used as a caliper log with 144 or 288 arms, which allows to determine the borehole shape. Televiewer amplitude image will give detailed information about the distribution and character of breakouts and hydraulic fracturing as well. For investigation purposes, a series of boreholes(total 195 boreholes: 12.239m) that have been logged all over the country during past 10 years are analyzed. The primary objective of this paper are to examnine the ability of a Televiewer to determine the shape of borehole, to present data inferred by stress indicators, to indicate their possible relationship with the anisotropic horizontal stresses. It is shown that in most cases the fracture orientation statistically estimated from observed fractures denotes an excellent correlation with the orientations inferred by stress indicators. Many intervals of breakouts are terminated at the intersection of oblique fracture with the borehole. The results from Televiewer data are further compared with those of hydraulic fracturing techniques.

• 한국가시화정보학회:학술대회논문집
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• 한국가시화정보학회 2002년도 추계학술대회 논문집
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• pp.19-22
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• 2002

A process of 3-D particle image velocimetry, called here, as '3-D stereo PIV' was developed for the measurement of a section field of 3-D complex flows. The present method includes modeling of camera by a calibrator based on the homogeneous coordinate system, transfromation of oblique-angled image to transformed image, identification of 2-D velocity vectors by 2-D cross-correlation equation, stereo matching of 2-D velocity vectors of two cameras, accurate calculation of 3-D velocity vectors by homogeneous coordinate system and finally 3-D animation as the post processing. In principle, as two frame images only are necessary for the single instantaneous analysis of a section field of 3-D flow, more effective vectors are obtainable contrary to the previous multi-frame vector algorithm. An experimental system was also used for the application of the proposed method. Three analog CCD cameras and an Argon-Ion Laser(300mW) for illumination were adopted to capture the wake flow behind a bluff obstacle.