• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2019.11a
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• pp.124-127
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• 2019

본 논문에서는 단일 이미지의 관심 영역에 기반한 저심도 후처리 방법을 제안한다. 저심도 이미지란 사진에서 초점이 선명하게 포착되는 깊이의 범위가 좁은 이미지를 말한다. 기존의 광학적 특성을 이용한 저심도 이미지를 만드는 과정은 물리적인 구조 설계비용 문제가 존재한다. 또한, 이미지의 후처리 보정을 통한 방법은 이미지상의 사물 깊이 정보를 알기 어렵기 때문에 이미지의 심도를 후처리하기 어려웠다. 이에 따라 본 논문에서는 슈퍼 픽셀 군집화 방법을 통해 관심 영역을 찾고, 이에 기반하여 관심 영역이 부각될 수 있는 저심도 후처리 방법을 제안한다. 제안하는 후처리 방법은 슈퍼픽셀 군집화 방법을 통해 관심영역을 설정하여 배경 영역을 분리하고 블러 과정을 수행한다. 관심 영역을 제외한 부분을 확장 한 뒤 배경 블러를 거치기 때문에 후광효과가 현저히 줄어든 저심도 효과가 적용된 이미지를 얻을 수 있었고 MSRA-1000 데이터 셋 이미지에서 우수한 주관적 화질 결과를 보였다.

• The Journal of the Korean dental association
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• v.49 no.8
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• pp.451-460
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• 2011

Dental caries has been widely prevalent with presence of cavitation on teeth. For the last several decades, the prevalence of dental caries in developed countries has rapidly decreased so there has been needed a new and detailed diagnostic guideline to differentiate the severity of dental caries, especially for early status of caries. The cariology specifically requires the development of an integrated definition of dental caries and uniform systems for measuring the caries process in the fields of clinical diagnosis and treatment, epidemiological researches, and dental education and so forth. The international Caries Detection and Assessment System (ICDAS) optically measures the enamel surface changes and potential histological depth of carious lesions by relying on surface characteristics of teeth. ICDAS is a visual classification system that was developed to diagnose the subtle changes of enamel surface, predict the progress direction of early caries, allow standardized data collection in relation to caries in different settings, and to enable better comparison of oral health between countries worldwide and research studies.

• Proceedings of the KSME Conference
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• 2004.11a
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• pp.788-792
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• 2004

In this study, the performance of the DPRMs is evaluated and the measurement precision for the pile driving is presented. The DPRMs is a visual-measurement system for the pile rebound and the penetration movement using a high speed line-scan camera. But the measurement errors of the DPRMs are caused by the strong impact for the pile driving. Therefore, the DPRMs should guarantee its measurement values for the pile driving. For this reason, the performance of the DPRMs by the vibration signal analysis is studied. It is found from this study that the measurement values of the DPRMs are reliable.

• Textile Coloration and Finishing
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• v.13 no.3
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• pp.180-187
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• 2001

Generally, polyester microfiber has much greater dye uptake than that of regular ones. In spite of high dye up-take visual shade depth of dyed fabric decreases with smaller denier, which results in poor washing fastness of dyed fabric. In this study, in order to investigate the washing fastness, polyester microfiber fabric was dyed by using two type of disperse dyes and treated with 3 different reduction clearing methods. The reduction clearing methods in this study are normal alkaline reduction clearing, $N_2$ gas replacement method, and ultrasonic treatment during reduction clearing. The results were as followings ; The most important factors affecting the washing fastness of polyester artificial suede fabric were found to be the reduction clearing method, the chemical structure of used disperse dyes and the structure and denier of fibers. It was also obtained that the heat treatment of dyed fabric decreased the washing fastness due to the dye migration from inner phase to surface.

• Tribology and Lubricants
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• v.26 no.5
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• pp.283-290
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• 2010

In this study, the stiffness and damping coefficients of herringbone grooved air journal bearings are studied. A generalized coordinate transformation method to handle the complex geometry of incompressible fluid bearing is modified for compressible fluid. The modified equations are discretized by the base of finite difference method. A new computer program using Visual C++ language is developed. The load carrying capacity and stiffness and damping coefficients are calculated according to the design parameters like groove depth or the number of grooves and compared to that of plain air journal bearings.

• International Journal of Costume and Fashion
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• v.10 no.1
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• pp.1-13
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• 2010

Japan is an advanced Asian country with a young, visual and stimulating culture that fascinates even western countries. The aim of this article was to provide an in-depth understanding of youth subculture as a medium of interpreting contemporary Japanese society and fashion, and understanding the values of Japanese youths today. The study of Japanese culture, youth culture, and Japanese youth subcultures of the 2000s and their clothing styles are based on documentary research and internet research, including a wide range of books and dissertations, and English, Korean and Japanese websites. It studies the unique youth subcultures of the country from the perspective of a Korean researcher who lives in a more fashion-conservative neighbouring country.

• The Journal of the Korean dental association
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• v.37 no.2 s.357
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• pp.126-130
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• 1999

Forty healty patients (15 males and 25 females) between 19 and 45 years of age with mandibular impacted third molar were selected for this tudy. A visual analog scale from 0 to 100 was used on the day of the procedure and on the first postoperative day for patient pain assessment. 1. In comparative study according to anesthesia, preoperative medication, depth of impacted teeth and gender, there were a variable range of pain and no significant differences statistically. 2. Intraoperative pain was the highest in the 2nd decade and first postoperative pain was the highest in the 3rd decade (P=0.0398) 3. Intraoperative and postoperative pain of operative duration below 10 minutes were the lower than that between 11 to 20 minutes (P=0.0398)

• Journal of Electrical Engineering and Technology
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• v.11 no.1
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• pp.234-240
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• 2016

We propose a novel framework for markerless camera-based games. By using a visual camera, our method may yield robust human body segmentation with high performance comparable to the segmentation using depth cameras. The edges of human bodies are detected by subtracting gradient backgrounds, and human body regions are segmented by the operations based on mathematical morphology. Collisions between detected regions and virtual objects are determined by finding the colliding time using intra-frame positions of virtual objects. Experimental results show that the proposed method may produce robust segmentation of human bodies, thereby and the collision responses are more accurate than previous methods. Therefore, the proposed framework can be widely used in camera-based games requiring high performance.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2001.10a
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• pp.330-335
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• 2001

Characteristics of the present world market include demanding and sophisticated customers, requirement of high quality and innovative products, greater product diversity, increasing labour and products costs, availability of diverse alternatives to the customers and smaller batch sizes to satisfy a variety of customer profiles. To fulfil these characteristics, manufacturing companies need to be flexible adaptable, proactive and able to produce variety of products in short time at low cost. The aim of the study is to develop a computer-aided design system for water-gate on AutoCAD R2000 system. The developed system has been written in AutoCAD and VisualLISP with a personal computer, and is composed four modules which are the gate-lifter input module, guide-frame input module, and upgrade module. Based on knowledge-based rules, the system is designed by considering several factors, such as width and height of a water-gate, material, object of product and maximum depth of water.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.435-438
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• 2003

Model for estimating daily paddy water requirements was developed to simulate daily streamflow in upstream and downstream. Evapotranspiration in paddy fields was estimated using modified Penman equation. Daily water requirements in paddy fields were calculated from multiplication of paddy area to ponding depth decreased for one day. And model was constructed with a system form user-friendly and almost completely using controls of image, grid, and etc. in Visual Basic 6.0. The developed model was applied to estimate daily agricultural water requirements at 12 small watersheds during 20 years from 1983 to 2002 with paddy field areas of $3,332{\sim}26,422ha$ in small watersheds, and with agricultural water requirements of $37.22{\sim}294.53mcm$ on yearly average.