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이채수,김경만,이철희,하영호,Lee, Chae-Soo,Kim, Kyeong-Man,Lee, Cheol-Hee,Ha, Yeong-Ho 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.6
최근에 영상 처리 시스템에서 칼라 데이타의 사용이 급격히 증가하고 있다. 그러나 색 재현 능력의 차이가 있고 각 장치마다 고유의 색좌표계를 사용하므로 서로 다른 장치사이에서 색 재현시에는 좌표계 변환이 요구된다. 특히 색재현 범위가 좁은 프린터에서 자연색을 출력하기 위해서는 색역 사상과 주어진 색역 계조의 범위를 확장할 수 있는 디더링 과정이 필요하다. 본 논문에서는 색역 사상을 위하여 각 장비의 출력 특성을 고려한 비선형 사상 함수를 획득하여 이를 기반으로 하여 장비들간의 색역 일치를 이루었다. 디더링 과정에서는 채색시 발생하는 중복 면적의 특성을 고려하여 양자화 단계를 확장하는 비선형 순서 디더링과 오차 확산 방법에서 발생하는 경계 부분의 문드러짐과 인접색의 변형을 줄일 수 있는 변형된 오차 확산 방법을 제안한다. Recently many devices print electronic images in a variety of ways. The reproduced color, however, is different from the original color because of the difference of hardware characteristics. To maintain device independent color, gamut mapping method is proposed. The proposed color gamut mapping uses nonlinear intensity mapping and clipping for saturation mapping on HSI color space. In the dithering operation, expanded nonlinear ordered dithering and modified error diffusion are proposed. The proposed ordered dithering uses expanded nonlinear quantization which considers overlapping phenomena of neighbored printing dots. In the modified error diffusion, quantization errors to be diffused are adjusted to improve both image blur and color change produced in the error diffusion. So, the printed image is similar to the image of monitor. Our results indicate that proposed algorithm can produce high quality image in the low bit color devices.
시각적 색일치를 위한 확장된 비선형 양자화와 색역매핑을 이용한 칼라 프린팅
이채수 ( Chae Soo Lee ),김경만 ( Kyung Man Kim ),이철희 ( Cheol Hee Lee ),하영호 ( Yeong Ho Ha ) 한국감성과학회 1997 연차 학술대회 논문집 Vol.1997 No.-
Recntly many devics print electronic images in a variety of ways. But the reproduced color is difference of hardware cjaracteristics. To maintain device independent color, gamut mapping method and expanded nonlinear quantization are proposed. The color gamut mapping uses nonlinear intensity mapping and clipping for saturation mapping of HSI color space. Dithering operation for printing uses expanded nonlinear quantization which considers overlapping phenomena of neighboring printing dots. So the printed image is similar to the image of monitor and can produce high quality image in the low bit color devices.
순산소 연소 기술 실증을 위한 영동 1 호기 보일러 개조 타당성 연구
이채수(Lee Chae Soo),김혁필(Kim Hyeok Pill),김상욱(Kim Sang Wook) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
125MWe Young Dong Unit 1 power station that has been firing low volatile anthracite coal for a number of years requires an upgrade or replacement for converting to bituminous and sub-bituminous coal and also for introducing an Oxy-PC firing demonstration capability for a period of approximately one year. The key object of this study is a selection of either a replacement boiler or a retrofit conversion of the existing down shot furnace to fire on oxygen or air. Four cases are proposed and evaluated on the ground of the collected data from site survey. The retrofit case of existing down-shot furnace and boiler pressure parts with new circular register burners in the lower furnace front and rear walls represents the optimum solution in terms of economic and technical performance for both air and oxy firing condition. The recommended case will be applied to FEED(Front End Engineering Design) study for the existing Young Dong Unit 1 boiler retrofit
이채수(Lee Chae Soo),최영준(Choi Young Jun),김현기(Kim Hyun Gee),양옥철(Yang Ok Chul),정재헌(Chong Chae Hon) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The once-through heat recovery steam generator is ideally matched to very high temperature and pressure, well into the supercritical range. Moreover this type of boiler is structurally simpler than drum type boiler. In drum type boiler, each tube play a well-defined role: water preheating, vaporization, superheating. Empirical equations are available to predict the average heat transfer coefficient for each regime. For once-through heat recovery steam generator, this is no more the case and mathematical models have to be adapted to account for the disappearance of drum type economizer, boiler, superheater. General equations have to be used for each tube of boiler, and actual heat transfer condition in each tube has to be identified.
Wi-Fi Direct 망을 위한 부하량 예측 기반의 전력 절감 기법
유홍석,박양우,이채수,윤태진,Yoo, Hongseok,Park, Yang-Woo,Lee, Chae-Soo,Yun, Tae-Jin 대한임베디드공학회 2015 대한임베디드공학회논문지 Vol.10 No.4
Wi-Fi Direct allows battery powered mobile devices to form a wireless ad hoc network. Since one member of the network called Group Owner (GO) takes the role of managing the network, the network lifetime is mainly affected by the energy efficiency of GO. Hence, Wi-Fi Direct defines power saving schemes that allow GO to save the energy by turning off its radio interface during the periods called absence periods. However, the Wi-Fi Direct specification does not specify how to set parameters (denoted by PS parameters) determining the schedule of the absence periods. In this paper, we therefore propose a novel traffic-aware power saving scheme for Wi-Fi Direct networks. In particular, the proposed scheme estimates the application-level traffic load and adaptively tunes the PS parameters according to the estimated value.
Secure Data Gathering Protocol over Wireless Sensor Network
최해원,류명춘,이채수,김현성,Choi, Hae-Won,Ryoo, Myung-Chun,Lee, Chae-Soo,Kim, Hyun-Sung The Society of Digital Policy and Management 2013 디지털융복합연구 Vol.11 No.12
A secure data gathering in a Wireless Sensor Network(WSN) has given attention to one of security issues. In general, the process of secure data gathering causes difficulties: one process is exchanging the secured data and the other is constructing secured data path. The previous studies have been resolving the difficulties in terms of two problems: security and data gathering in WSNs. However, a WSN requires a protocol that has to guarantee a security of path between sensors and sink, or a cluster head. Thus how to gather data securely is an important issue. In this paper, we propose a secure data gathering protocol over WSNs, which consists of hierarchical key settlement and secure path construction, and aims at tackling two problems. The proposed protocol causes little overhead to sensor nodes for secured key settlement and path construction. This work provides security analysis focused on the key settlement protocol and evaluates network performance for the proposed data gathering protocol through simulation. 무선센서 네트워크에서 안전한 데이터 수집은 중요한 보안이슈 중에 하나이다. 일반적으로 안전한 데이터 수집이란 데이터 자체의 보안과 안전한 전송 경로 확보를 의미한다. 본 논문은 이와 같은 관점에서 무선센서 네트워크에서 안전한 데이터 수집 프로토콜을 제안한다. 제안하는 프로토콜은 계층형 센서네트워크를 고려한 계층형 키 보안 기법과 안전을 보장할 수 있는 전송경로 설정을 핵심적으로 제시한다. 프로토콜은 네트워크 부하를 최소화 할 수 있도록 최적화 되었으며 네트워크 공격으로 인해 발생하는 문제점을 효과적으로 차단한다. 성능평가 결과 제안하는 프로토콜은 네트워크 퍼포먼스를 고려한 데이터 수집에 효율적이다. 데이터 수집 시 안전을 확보하기 위한 보안 분석 역시 검증해 보았다.