• 대한방사선기술학회지:방사선기술과학
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• 제43권6호
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• pp.489-494
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• 2020

The Law method is observing the temporal bone. There are two types of methods: the double angle method, which manipulates the center ray angle of the tube twice, and the single angle method, which manipulates once. The purpose is to increase the reproducibility of the image by making vertical incidence by making an assistive device using a 3D printer. Two assistive devices with a wedge-shaped 8.5 × 10 × 2.3 cm, an inclined surface of 7.5 cm, and an inclination angle of 15° were fabricated. Assistive devices can be combined with each other in the form of grooves, and PLA (Poly Lactic Acid) is used as a material. In the first experiment, 10 examiners operated the tube 15° in the caudad direction and 15° in the anterior direction, and measured it with a protractor to conduct a reproducibility experiment. Second, two examiners acquired vertically incidence images using the existing law method and assistive devices, and measured the distance between each measurement point to evaluate the reproducibility. The tube center ray angle reproducibility experiment was not statistically significant, but the angle difference was up to 9° between examiners. The reproducibility experiment of radiographic images was not statistically significant with the conventional method, and the method using an assistive device was statistically significant. Therefore, regardless of skill level, an image capable of securing reproducibility, which is the advantage of vertical incidence, could be obtained.

• Physical Therapy Rehabilitation Science
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• 제11권2호
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• pp.215-223
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• 2022

Objective: This study was to resolve the limitations of the experimental environment and to solve the shortcomings of the method of measuring human gait characteristics using optical measuring instruments. Design: A cross-sectional study. Methods: Fifteen healthy adults without a history of orthopedic surgery on the lower extremities for the past 6 months were participated. They were analyzed gait variables using the smart guide and the 3D image analysis at the same time, and their results were compared. Visual-3D was used to calculate the analysis variables. Results: The reliability and validity of the data according to the two measuring instruments were found to be very high; gait speed(0.85), cycle time(0.99), stride time of both feet(0.98, 0.97) stride legnth of both feet(0.86, 0.88) stride per minute of both feet(0.99, 0.96), foot speed of both feet(0.90, 0.91), step time of both feet(0.77, 0.71), step per minute(0.72, 0.74), stance time of both feet(0.96, 0.97), swing time of both feet(0.93, 0.79), double step time(0.81), initial double step time(0.84) and terminal step time(0.76). Conclusions: In the case of the smart insole, which measures human gait variables using the pressure sensor and inertial sensor inserted in the insole, the reliability and validity of the measured data were found to be very high. It can be used as a device to replace 3D image analysis when measuring pathological gait.

• 패션비즈니스
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• 제12권4호
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• pp.99-113
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• 2008

The purpose of this study is to compare the social image and the external image of a Korean woman in 1970s and find out that the make-up can provide an important clue to examine the image of a woman in a given period. The research scope covered 10 top news of the daily newspapers and articles of women's magazines. A focus was made to an analysis on words and photos from them. The relationship of each image scale was examined by comparing the linguistic image scale and the visual image scale. The results were as follows : First, a frugal and tidy image. It was the look of our tidy, simple, traditional and classic woman. Second, an image of a cute and pure lady of refined manners. In 1970s, women were supposed to be 'a loving wife', a cultured female image with a faithful role of a 'wise mother' and a lady of refined manners as the best value. Third, a frivolous and decadent image. Double-faced image of a woman which included the women, who had to live as the lady of refined manners during the daytime and seductive woman during the night. Fourth, an image of a contemporary working woman. It was the image as a chic, confident and dignified working woman requested by the society of the times. Namely, it can be understood that women had a make-up of a soft and gorgeous tone as an expression of a will to keep a confident and female aspect in the course of working in the society by the women experiencing 1970s, the turbulent period. Consequently, it is possible to understand that the make-up was utilized as a means to express an ideal beauty of the time pursuant to the historical background or feature.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제14권6호
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• pp.604-608
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• 2008

TFT-LCD영상은 불균일한 휘도 변화를 어느 정도 허용하고 있으며, 영상 전반에 걸쳐 나타나는 큰 휘도 변화는 국부적으로 주변 영역과 차이가 나는 결함 영역을 찾는데 방해가 된다. SQI(Self Quotient Image)는 얼굴 인식 분야에서 저주파에 해당하는 조명성분을 제거 하는데 사용되어 왔으며, 일종의 High Pass Filter(고주파 통과 필터) 형태이다. 본 논문에서는 SQI가 신호의 저주파 성분을 평활화 하는 효과를 가지면서 국부적인 변화를 유지하는 특성을 가지는데 착안하여, TFT-LCD영상에 존재하는 결함을 강조하는 알고리즘을 제안하였다. 제안한 방법을 기존의 TFT-LCD영상 전처리 방법들과 비교하였을 때, 평활화 효과 및 결함 영역 강조 효과가 우수함을 확인할 수 있었다.

• 전자공학회논문지
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• 제51권3호
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• pp.112-118
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• 2014

디지털 영상 확대를 위한 영상 스케일링은 고품질의 영상이 요구될수록 많은 수행시간 및 하드웨어 자원량이 요구된다. 본 논문에서는 적은 연산량 및 하드웨어 자원으로 고품질 영상을 생성하는 이중 선형-3차회선 보간법을 제안한다. 제안한 보간법은 4번의 선형 보간법과 1번의 3차회선 보간법으로 이루어진 선형-3차회선 보간법을 수평방향과 수직방향으로 각각 수행하는 구조이다. 실험결과, 제안하는 보간법은 PSNR과 수행시간 및 하드웨어 자원량 측면에서 비교했을 때, 적은 연산량 및 하드웨어 자원으로 양 3차회선 보간법보다 우수한 PSNR을 제공했다.

• 한국전자통신학회논문지
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• 제14권4호
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• pp.663-670
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• 2019

지하철에서 스크린 도어와 플랫폼간의 경계선을 검출할 수 있는 변형된 케니에지 검출 알고리듬을 제안한다. 일반적으로 지하철에서는 플랫폼과 스크린 도어 사이의 경계선은 주변에 비해 어둡게 나타나므로 이의 특성을 고려하여 변형된 bottom-hat 변환을 이용해 에지 영상을 만든다. 이렇게 구한 에지 영상에 이중 문턱화를 통해 강한 에지와 약한 에지를 포함하는 이중 문턱화 영상을 얻는다. 이중 문턱화 영상에 호프 변환을 적용하여 플랫폼과 스크린 도어 간의 경계선을 검출하여 그 길이를 계산하고, 사람 등 물체가 있을 때와 없을 때와의 경계선 길이를 비교함으로써, 경계선을 침범 여부를 판단하는 알고리듬을 제안한다. 본 논문에서는 카메라 높이 위치에 따라 두 종류의 서로 다른 입력영상을 사용하여 제안한 변형된 케니에지 검출 알고리듬에 대한 결과를 컴퓨터 시뮬레이션으로 나타내었다.

• Geomechanics and Engineering
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• 제31권6호
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• pp.599-614
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• 2022

One of the methods of stabilizing retaining walls, embankments, and deep excavations is the implementation of plate anchors (like the Geolock wall anchor systems). Back-to-back Mechanically Stabilized Earth (BBMSE) walls are common stabilized earth structures that can be used for bridge ramps. But so far, the analysis of the interactive behavior of two back-to-back anchored walls (BBAW) by double-plates anchors (constructed closely from each other and subjected to the limited-breadth vertical loading) including interference of their failure and sliding surfaces has not been the subject of comprehensive studies. Indeed, in this compound system, the interaction of sliding wedges of these two back-to-back walls considering the shear failure wedge of the foundation, significantly impresses on the foundation bearing capacity, adjacent walls displacements and deformations, and their stability. In this study, the effect of horizontal distance between two walls (W), breadth of loading plate (B), and position of vertical loading was investigated experimentally. In addition, the comparison of using single and equivalent double-plate anchors was evaluated. The loading plate bearing capacity and displacements, and deformations of BBAW were measured and the results are presented. To evaluate the shape, form, and how the critical failure surfaces of the soil behind the walls and beneath the foundation intersect with one another, the Particle Image Velocimetry (PIV) technique was applied. The experimental tests results showed that in this composite system (two adjacent-loaded BBAW) the effective distance of walls is about W = 2.5*H (H: height of walls) and the foundation effective breadth is about B = H, concerning foundation bearing capacity, walls horizontal displacements and their deformations. For more amounts of W and B, the foundation and walls can be designed and analyzed individually. Besides, in this compound system, the foundation bearing capacity is an exponential function of the System Geometry Variable (SGV) whereas walls displacements are a quadratic function of it. Finally, as an important achievement, doubling the plates of anchors can facilitate using concrete walls, which have limitations in tolerating curvature.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2008년도 제39차 동계학술발표논문집 16권2호
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• pp.207-210
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• 2009

Edge detection is an important process in low level image processing. But many proposed methods for edge detection are not very robust to the image noise and are not flexible for different images. To solve the both problems, an algorithm is proposed which eliminate the noise by mean shift algorithm in advance, and then adaptively determine the double thresholds based on gradient histogram and minimum interclass variance, With this algorithm, it can fade out almost all the sensitive noise and calculate the both thresholds for different images without necessity to setup any parameter artificially, and choose edge pixels by fuzzy algorithm.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권5호
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• pp.2171-2185
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• 2020

In order to judge that whether the vehicles in different images which are captured by surveillance cameras represent the same vehicle or not, we proposed a novel vehicle face recognition algorithm based on improved Nonnegative Matrix Factorization (NMF), different from traditional vehicle recognition algorithms, there are fewer effective features in vehicle face image than in whole vehicle image in general, which brings certain difficulty to recognition. The innovations mainly include the following two aspects: 1) we proposed a novel idea that the vehicle type can be determined by a few key regions of the vehicle face such as logo, grille and so on; 2) Through adding weight, sparseness and classification property constraints to the NMF model, we can acquire the effective feature bases that represent the key regions of vehicle face image. Experimental results show that the proposed algorithm not only achieve a high correct recognition rate, but also has a strong robustness to some non-cooperative factors such as illumination variation.

• 정보학연구
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• 제5권1호
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• pp.1-12
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• 2002

본 논문에서는 문서화상에 대한 차분 부호장 혼합 알고리즘을 제안한다. 본 알고리즘을 사용할 경우 RL과 DM 알고리즘에 비해 동일 문서에 2배의 정보를 합성할 수 있다. 본 알고리즘을 사용할 경우 비 보안 문서상에 디지털 서명 뿐 아니라 보안 문서도 합성 가능하다. 이 경우 제 3자가 보안 전송 사실을 감지 할 수 없어 문서의 보안 전송이 구현된다.