• Journal of the Korean Society of Radiology
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• v.9 no.3
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• pp.175-181
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• 2015

In this paper, we studied additional filter and Ion chamber combinations to reduce patient dose without decreasing image quality in digital chest x-ray projection. The experiment set 125 kVp, 320 mA, AEC mode. Ion chamber sensors was divided by 4 cases of combinations, then, we measured patient dose and calculated organ dose using PCXMC. Also, physical image assessment using MTF was performed. As a results, The surface entrance dose and organ dose were the lowest when selecting both left and right Ion chamber sensors under the same conditions of additional filter. In image quality assessment, The spatial frequency scored 2.494 lp/mm which was highest when selecting both right and left Ion-chambers and 0.1 mmCu filter. And to conclude, to select both right and left Ion chamber sensors and 0.1 mmCu filter will help for acquiring good quality image as well as reducing patient dose.

• Journal of the Korea Society of Computer and Information
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• v.26 no.5
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• pp.9-16
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• 2021

In this paper, we propose a building exploration drone that can be used for a digital twin-based building control system. The existing building control system using a fixed position sensor box has a problem that a management blind spot occurs. And because people patrol themselves, it takes a lot of human resources. In this paper, a drone equipped with a temperature and humidity sensor and a gas leak detection sensor is used to search the internal path of the building centering on the control blind spot. It also aims to solve the problem of the building control system by transmitting information in real time along with the video. In addition, it has a stable hovering function using an optical floor sensor and can be applied to an existing digital twin-based building control system. The results of this study are believed to be of great help in improving the quality of digital twin control systems using drones.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.11a
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• pp.39-41
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• 2018

본 논문은 본인이 제작한 라는 인터랙티브 미디어 아트 작품에 관련한 글이다. 발전하는 디지털 기술 안에서 아날로그 감성을 이끌어내기 위한 작품 제작 방법으로 손으로 그린 나뭇잎을 입자로 사용한 파티클 시스템을 이용하였다. 그리고 NUI 인터페이스인 립모션 센서를 사용해 자연스러운 손 동작 인식을 하여 파티클 시스템과 연동하였다. 관람자는 바람을 일으키는 손 동작을 하며 가을 풍경과 같은 나뭇잎 파티클의 변화를 느끼게 되고, 계속되는 손동작에 따라 나타난 새로운 동영상을 감상하며 잃어버린 감성을 느끼게 된다. 아날로그 컨텐츠와 디지털 기술의 융합은 관람자에게 친근한 접근과 감성을 자극함으로써 인터렉티브 미디어 아트의 새로운 확장의 가능성을 보여준다.

• Journal of the Korean Society of Radiology
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• v.3 no.3
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• pp.27-35
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• 2009

In this study, the basic research verifying possibility of applications as radiology image sensor in Digital Radiography was performed, the radiology image sensor was fabricated using double layer technique tio decrease dark current. High efficiency material in substitution for a-Se have been studied as a direct method of imaging detector in Digital Radiography to decrease dark current by using Hetero junction already used as solar cell, semiconductor. Particle-In-Binder method is used to fabricate radiology image sensor because it has a lot of advantages such as fabrication convenient, high yield, suitability for large area sensor. But high leakage current is one of main problem in PIB method. To make up for the weak points, double layer technique is used, and it is considered that high efficient digital radiation sensor can be fabricated with easy and convenient process. In this study, electrical properties such as leakage current, sensitivity is measured to evaluate double layer radiation sensor material.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.534-539
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• 2008

This paper is about intelligent hexapod robot for the support walking of the aged person. The robot using various sensors and small camera has various abilities of forward backward walking, turing left or right, control the speed of walking, avoiding the obstacles and detecting risky situation of fire or gas. To let the aged feel soft and safe walking, we used special servo motor and developed hexapod walking mechanism and effective algorithm.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.2
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• pp.322-329
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• 2007

A single pixel photon counting type image sensor which is applicable for medical diagnosis with digitally obtained image and industrial purpose has been designed with $0.18{\mu}m$ triple-well CMOS process. The designed single pixel for readout chip is able to be operated by single supply voltage to simplify digital X-ray image sensor module and a preamplifier which is consist of folded cascode CMOS operational amplifier has been designed to enlarge signal voltage(${\Delta}Vs$), the output voltage of preamplifier. And an externally tunable threshold voltage generator circuit which generates threshold voltage in the readout chip has been newly proposed against the conventional external threshold voltage supply. In addition, A dark current compensation circuit for reducing dark current noise from photo diode is proposed and 15bit LFSR(Linear Feedback Shift Resister) Counter which is able to have high counting frequency and small layout area is designed.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.40 no.1
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• pp.43-50
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• 2003

Today, the demand of image acquisition systems grows as the multimedia applications go on increasing greatly. Among the systems, film scanner is one of the systems, which can acquire high quality and high resolution images. However due to the nonlinear characteristic of the light source and sensor, colors of the original film image do not correspond to the colors of the scanned image. Therefore color correction mr the scanned digital image is essential in the film scanner. In this paper, polynomial regression method is applied for the color correction to CIE $L^{*}$ $a^{*}$ $b^{*}$ color model data converted from RGB color model data. A1so a film scanner hardware with 12 bit color resolution for each R, G, B and 2400 dpi was implemented by using TMS320C32 DSP chip and high resolution line sensor. An experimental result shows that the average color difference ($\Delta$ $E^{*}$$_{ab}$ ) is reduced from13.48 to 8.46.6.6.6.6.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2009.04a
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• pp.295-296
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• 2009

국내에 도입된 라인센서방식의 디지털항공카메라 ADS40영상을 활용하여 항공삼각측량을 수행하는데 있어 기준점의 수량 및 배치를 달리하여 성과를 분석한 결과는 모든 방법에서 국토지리정보원 항공사진측량작업내규에서 요구하는 정확도를 확보할 수 있었고, 기준점의 배치가 조밀하면 좀 더 양호한 성과를 확보할 수 있음을 확인했다.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.1325-1330
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• 2006

유비쿼터스 켬퓨팅 환경에서는 디지털 멀티미디어 컨텐츠를 사용자가 언제 어디서나 컨텐츠를 소비할 수 있도록 다양한 환경에 맞게 능동적으로 적응변환 시켜주는 기술이 필요하다. 본 논문에서는 유비쿼터스 컴퓨팅 환경이 가능하도록 구성된 가정에서 여러 종류의 디스플레이에 색각인 사용자에게 필요한 서비스와 정보를 제공해 주는 시스템을 제안한다. 단순히 세션 정보를 이용하여서 다양한 위치의 디스플레이에 정보를 제공해주는 기능에 '사용자의 취향과 색각 유무에 따라 변형되어진 정보' 를 제공해주게 되는 시스템을 설계하였다. 제안한 시스템은 크게 사람의 위치 정보를 인지하는 센서 입력부, LCD 모니터나 TV 브라운관과 같이 영상 정보를 출력해 줄 수 있는 출력부, 사용자에 대한 세션 정보 관리와 스트리밍 서비스를 제공해주는 서버 부분으로 구성되어 있다. 사용자의 위치에 대한 정보는 유비쿼터스 컴퓨팅 환경으로 구성된 테스트 베드 내부 센서를 통해 각 디스플레이의 해당 서비스 지역에 사용자가 들어가게 되면 사용자를 인지하도록 하였다. 제공되는 영상은 인지된 사용자 정보를 통해, 색각자인 경우, 색각자를 위해서 변환 되어진 영상을 사용하며, 또한 미리 설정되어진 사용자의 취향에 관련되어진 장르로 구성되어진 메뉴를 통해서 제공된다. 제안한 시스템은 가정에서 유비쿼터스 컴퓨팅이 가능하도록 한 구성한 Active Home상에 구현하였다. Active Home에서는 서버에서부터 실시간으로 사용자의 위치 정보를 제공 받으며, 사용자의 색각 유무에 따라 색각자를 위해 변환된 영상 또는 원본 영상을 보여준다. Active Home에서의 실험을 통해, 제안한 시스템은 유비쿼터스 컴퓨터 환경에서 사용자의 취향에 따라 자연스러운 인터렉션과 세션 정보를 Seamless하게 제공해주는 도구로 사용 가능함을 보였다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.43 no.6 s.312
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• pp.92-100
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• 2006

In imaging devices such as digital cameras using a single image sensor, captured images are the sub-sampled images comprised of the pixels that have only one of the three primary colors per a pixel. This images should be restored to the color images through an image processing referred as color interpolation. In this paper, we derive relation between the average of the data from CFA image sensor and the average of each color channel data. By using this relation, a new efficient method for color interpolation is proposed. Also, in order to reduce the zipper effect in a restored image, missing luminance values are interpolated along any edges in the captured image. On the other hand, for the chrominance channel interpolation, we average difference between a chrominance value and a luminance value in a local area, and this average value is added to the pixel value of the interpolated location. The proposed method has been compared with several previous methods, and our experimental results show the better results than the other methods.