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이미지 인증과 변형 검출을 위한 DWT기반 다중워터마킹
강태환(Kang Tae-Hwan),장호현(Jang Ho-Hyun),김동서(Kim Dong-Seo),주낙근(Joo Nak-Keun) 한국콘텐츠학회 2005 한국콘텐츠학회 종합학술대회 논문집 Vol.3 No.2
본 논문에서는 디지털 영상의 인증과 변형 검출 및 저작권 보호를 가능하도록 다중워터마킹 기법이 제안되었다. 원영상을 DWT(Discrete Wavelet Transform) 변환한 후 이미지의 인증과 변형된 위치를 검출하기 위하여 저주파 부분인 LL밴드의 LSB(Least Significant Bit)에 암호화된 워터마크 정보를 삽입한다. 또 저작권 보호를 위하여 고주파부분의 웨이블릿 계수들의 교환을 통해 워터마크 정보를 삽입한다. 이렇게 함으로써 저주파부분의 LSB 값 추출을 통해 인증 및 그 변형 위치를 찾을 수 있었으며, 고주파부분에 삽입된 워터마크를 추출하여 원영상의 저작권 정보를 감지할 수 있었다. In this paper, the multi watermarking method to make it possible to the authentication, modification detection and copyright protection of the digital image was proposed. After the original image is transformed by the DWT(Discrete Wavelet Transform), the encrypted watermark information is embedded into the LSB(Least Significant Bit) of LL band on 1he low frequence domain for authenticating and detecting modified position in the image. And watermark information is embedded by exchanging the wavelet coefficient for the copyright protection. Thereby, we can authenticate the modification and detect the modified location by extracting the values of LSB on the low frequence domain. And we can perceive the copyright information of original image by extracting the embedded watermark on the high frequence domain.
기성시가지내에 아파트 거주민의 주거이동 의향에 관한 연구
강태환 ( Tae Hwan Kang ) 한국부동산분석학회 2006 不動産學硏究 Vol.12 No.2
The purpose of this study is to analyze the actual conditions and residential factors of moving-out intention of apartment residents lived in the congested area. The results of the study are followings. 1) As the result of analyzing the actual conditions of apartment complexes in the congested area, the apartment complexes are more obsolescent than those in the new town, and majorities of them are small complexes without enough amenities. 2) As the result of surveying on the residents in the congested area, almost 60% of residents are likely to move out from the congested area. Especially, it is analyzed that the residential factors to pulling out the residents from the congested area are residential environments of inner and outer apartment complexes rather than physical condition of apartment unit inside. It is shown that residents intend to move to the planned residential are around suburban. Fewer prefer central business district or the congested area.
강태환(Tae-hwan Kang),유지윤(Ji-yoon Yoo),이광운(Kwang-woon Lee) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 전력용 반도체 소자의 손실을 추정하고, 추정된 손실로부터 열 등가 회로를 만들어 PSIM 소프트웨어를 통해 인버터의 열 해석 시스템을 구축하고, 손실 및 온도 변화를 시뮬레이션 하였다. 그리고 실험을 통해 손실 및 온도를 측정 하여, 시뮬레이션을 검증하였다. 또한 수식으로서 계산되는 손실 값과 비교하여 제안된 손실 추정 방법의 우수성을 검증하였다.
논문 : 노외기계시스템공학 ; 과수용 방제기 전도 방지 구조물의 설계
강태경 ( Tae Gyoung Kang ),이채식 ( Chai Sik Lee ),전현종 ( Hyeon Jong Jun ),최덕규 ( Duck Kyu Choi ),박석호 ( Suk Ho Park ),김혁주 ( Hyeok Ju Kim ),강태환 ( Tae Hwan Kang ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.6
Damage to agricultural production caused by insects and diseases affects farming yields. The orchard sprayer is mainly used in the country to protect the fruit in a large area, with less effort and at minimum cost. The excellent performance of the air blast spray increases the fruit protection. Chemical application in orchards has been accomplished by the orchard sprayers with air assist nozzles and a axial fan in Korea. However, the orchard sprayers without ROPS resulted in severe injury or death when operators drive the sprayers improperly on hilly orchard or farming road. This study was to develop a ROPS for the orchard sprayers improving farmer`s safety. In this study, the accident case was used in analysing the design and building TOP structure of the orchard sprayer. The maximum impact, body torsion frame structures including the driver`s protection are also analysed for adherence to safety regulations. The ROPS safety regulations according to the strength test results were established.