• 프린팅코리아
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• s.11
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• pp.78-83
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• 2003

일본을 비롯해 해외에서는 무수인쇄 및 CTP에 대한 관심이 높아지고 있다. 그것은 도트게인이 적고, 세밀하게 인쇄할 수 있다는 장점과 더불어 인쇄기술자들이 습수관리에 신경을 쓰지 않아도 된다는 장점이 있다. 사실은 이러한 것들보다 외국에서는 폐수 및 알코올의 발생이 없는 등 환경적인 측면에서의 메리트를 높게 평가하고 있어 단체를 만들어 활동하는 한편, 행정기관에서도 무수인쇄를 장려할 정도로 친환경적이라는 평가를 받고 있다. 그러나 국내에서는 판재가격이 비싸고 초기 투자비용이 많이 들어가는데 비해 제 가격을 받지 못한다는 이유로 무수인쇄를 외면해 오고 있다. 거기에다 환경에 대한 의식도 낮은 편이어서 국내에서는 쉽게 발을 붙일 수가 없는 실정이다. 이에 본지에서는 최근 CTP장비의 보급과 더불어 다시 관심의 대상이 되고 있는 무수인쇄에 대해 일본의 도입사례를 중심으로 알아본다.

• Journal of Korea Multimedia Society
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• v.4 no.2
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• pp.116-129
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• 2001

To improve the performance of the inverse halftoning, smoothing masks should be designed optimally by using the accurate information of halftone cells. In this thesis, the method of energy minimization is so defined as to determine the exact information of halftone cell. A heuristic search method is proposed to obtain efficiently the parameters of halftone cells which determine the minimum energy. A halftone-peak modeling method with several functions is proposed and used to get initial values of the parameters. The dimension decomposition technique is also adopted to speed up the search process of energy minimization. Several experiments show that the proposed method extracts correct location of the seed pixel of the halftone cell and the extracted information of the halftone cell can be used to get more exactly smoothed color images. The proposed method can be applied to extract the texture patterns, to separate channel images of a scanned color halftone image, and to extract the moire area in an image.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.6
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• pp.217-222
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• 2017

Any object located in the earth's gravitational field experiences a force in the direction of the center of the earth. In order to describe the motion of objects in the field, the solutions to a system of simultaneous vector kinematic equations need to be obtained. In the analysis of freely-falling objects, the reference direction +y is usually defined to be the downward direction. In the analysis of the motion of objects thrown upward, the reference direction +y is usually defined to be the upward direction. In the analysis of the motion of objects thrown downward, the reference direction +y is usually defined to be the downward direction. In this paper, we show that the choice of reference axis in either upward or direction gives the same results by adopting a scalar product of two vectors in solving the vector kinematic equations. It is rare to find other examples of using a scalar product of two vectors in solving vector kinematic equations describing the motion of objects. An application of this study is that we can arbitrarily choose the reference direction for objects moving in a horizontal direction, including projectile motions.

• Journal of KIISE:Software and Applications
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• v.32 no.3
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• pp.141-152
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• 2005

A new emotion-based image retrieval method is proposed in this paper. Query emotion descriptors called query color code and query gray code are designed based on the human evaluation on 13 emotions('like', 'beautiful', 'natural', 'dynamic', 'warm', 'gay', 'cheerful', 'unstable', 'light' 'strong', 'gaudy' 'hard', 'heavy') when 30 random patterns with different color, intensity, and dot sizes are presented. For emotion image retrieval, once a query emotion is selected, associated query color code and query gray code are selected. Next, DB color code and DB gray code that capture color and, intensify and dot size are extracted in each database image and a matching process between two color codes and between two gray codes are peformed to retrieve relevant emotion images. Also, a new relevance feedback method is proposed. The method incorporates human intention in the retrieval process by dynamically updating weights of the query and DB color codes and weights of an intra query color code. For the experiments over 450 images, the number of positive images was higher than that of negative images at the initial query and increased according to the relevance feedback.

• Clean Technology
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• v.20 no.2
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• pp.97-102
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• 2014

Currently various studies are underway for dispensing high-viscosity phosphor. These studies have reported limitations and challenges in the dispensing process. The discharged amount of phosphor was approximately the same each time which is important for the implementation of high-efficiency white LED technology. This paper present high-viscosity phosphor dispensing process for white LED implementation by using electrostatic printing technology. The voltage controlled DOD (Drop-On-Demand) discharge experiment was studied to determine angle of drop meniscus at nozzle and dot diameter. With increase in Discharge voltage, the discharge angle of meniscus increased while dot diameter decreased. Therefore it can be concluded that we can control the discharge rate by controling the discharge angle of meniscus.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.6
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• pp.1089-1094
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• 2022

In this paper, a human coexistence-type companion robot that can communicate with people in daily life and alleviate the gap in care personnel was studied. Based on the voice recognition module, servo motor, and Arduino board, a companion robot equipped with a robot arm control function using voice recognition, a position movement function using RC cars, and a voice recognition function was tested and manufactured. As a result of the experiment, the speech recognition experiment according to distance showed the optimal recognition rate at a distance of 5 to 30 cm, and the speech recognition experiment according to gender showed a higher recognition rate in the first tone, monotonous tone. Through the evaluation results of these motion experiments, it was confirmed that a companion robot could be made.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.388-390
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• 2021

This paper introduces a system that can help visually impaired people to board a bus using an embedded board with keypad, dot matrix, lidar sensor, NFC reader, a public data portal Open API system, and deep learning algorithm (YOLOv5). The user inputs the desired bus number through the NFC reader and keypad, and then obtains the location and expected arrival time information of the bus through the Open API real-time data through the voice output entered into the system. In addition, by displaying the bus number as the dot matrix, it can help the bus driver to wait for the visually impaired, and at the same time, a deep learning algorithm (YOLOv5) recognizes the bus number that stops in real time and detects the distance to the bus with a distance detection sensor such as lidar sensor.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.33B no.11
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• pp.150-158
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• 1996

Physiological observations reported and the perceptual phenomena that some simple arrays of discrete dots are perceived as a continuous curve, and others are perceived as an angular contour or as consisting of separate goups of dots. The perception of continuous curves versus discondinuous angles is mainly determined by the relative orientations of the dots, i.e., by the angles between sucessive virtual lines, whereas the length of the virtual lines gives little influence. It is important that the perception of dot stimuli is presented by vitual lines between dots in visual information processing. In this paper, on the basis of these facts of physiological observations, some experimental results on the perception of visual lines form dot stimuli are shown. Triples of the dots used in the experiment are similar to those of smith & Vos' physiological experiments.

• Publications of The Korean Astronomical Society
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• v.5 no.1
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• pp.95-103
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• 1990

일반인에게 널리 보급된 IBM 계열의 16비트 PC(XT, AT)로도 손쉽게 도형출력이 가능한 천문 계산용 포트란 그래픽 라이브러리를 CALCOMP계의 문법에 맞추어 개발하였다. 본 라이브러리를 사용하면 그래픽 어댑터(HGC, CGA, EGA, VGA)에 임의로 대응되는 화면출력과 XY플롯터는 물론이거니와 EPSON계의 9핀 혹은 24핀 도트프린터에 의한 고품질(9핀 프린터; 0.21mm/dot, 24핀 프린터; 0.14mm/dot)의 도형출력이 가능하다. 프린터에 의해 출력 가능한 도형의 크기는 하드디스크의 용량이 허용하고 처리 속도를 인내할 수 있는 한 무한대로 확장할 수 있는데 비교적 빠른 시간 내에 처리할 수 있는 표준 도형 크기로서 최대 작도 범위를 80 컬럼용 프린터 용지 한 페이지 크기인 $25cm{\times}20cm$를 지정하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1215-1219
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• 2003

Light Guide Panel(LGP) is a key part of backlight unit(BLU) which transforms line-light of lamp to surface-light. Dot pattern is formed on the injected LGP surface by screen printing. This dot pattern is composed of several ten thousands micro dots of diameter 150-180$\mu\textrm{m}$ or so. The dot patterning by screen printing causes low productivity and low performance of TFT-LCD. This research develops the micromachining technology for LGP mould which could form micro dot pattern by injection molding, removing the existing screen printing process.