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우동훈,정의필 한국음향학회 2003 韓國音響學會誌 Vol.22 No.4
In this paper, we proposed the robust watermark diminishing distortion of the original data inserting the watermark in specific coefficients of the frequency domain. In case the alpha is more than 0.5. we found that proposed watermark is detected by experiment of MP3, FFT, Cropping and Echo attack. Our proposed method improved the Cox's method in the SNR aspect. 본 논문에서는 공격에 강인하면서 원본데이터의 변형을 작게 하는 워터마크삽입 방법을 제안하였다. 제안된 방법은 스프레드 스펙트럼 방법을 이용하여 워터마크를 삽입시 주파수 계수가 큰 값 순이 아닌 특정 범위의 값에 워터마크를 삽입함으로써 고음질의 워터마크가 삽입된 데이터를 얻을 수 있었으며, 워터마크가 삽입된 데이터에 MP3 압축, FFT 필터링, Cropping 및 Echo등의 공격을 가한 후 워터마크 추출실험을 해 본 결과 모든 공격에 대해 α가 0.5이상인 경우에는 워터마크 추출이 가능하였다. Cox가 제안한 방법보다 SNR면에서 훨씬 좋은 성능을 보였다.
우동훈,김자희,김우제 조선대학교 공학기술연구원 2023 공학기술논문지 Vol.16 No.1
While many companies facing IT outsourcing are approaching the decision to changeor maintain their vendors, previous research has focused mainly on the decision factors for initialoutsourcing and individual outsourcing types. Although some studies have been conducted on IToutsourcing, they have been limited to specific quality or threat factors. This study identifieddecision factors from the perspectives of IT outsourcing service users and providers and analyzedthe frequency and importance of decision factors among respondent groups. In addition, toimprove service quality, the weights between decision factors were calculated and prioritized, andthe Mann-Whitney U test was conducted to confirm the differences in weights between the twogroups. The findings of this study are as follows. First, the individual perception items of IToutsourcing service experience were categorized into 17 outsourcing decision factors. Second,differences in outsourcing decision factors were found between user groups and service providergroups. Third, the importance of the identified decision factors was confirmed through decisionanalysis. The IT outsourcing decision factors derived from this study will be helpful for decisionmakers who need to maintain or change vendors through outsourcing contracts.
하나의 절개선에 의한 전두근 전이법을 이용한 안검하수증의 교정
윤진호,임동헌,김한중,우동훈 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.4
Many and various approaches to the treatment of ptosis of upper eyelid have been reported. In patient with absence of levator function, the choice of treatment was frontalis sling operation. In recent, procedure using frontalis muscle directly through two incisions was replaced by, but the problem such as incision scar still was not resolved. So, through single incision, frontalis muscle transfer technique was tried out with aesthetically better results. Therefore the authors used single incision technique for satisfactory results. The results obtained were as follows; 1.No scar line on infraeyebrow area was obtained without damage to hair follicles. 2.Compared with normal eye in unilateral blepharoptosis, both eyes were symmetric postoperatively. 3.In patient with Marcus-Gunn phenomenone, jaw-winking was subsided. 4.There was little difference in complications, such as lagophthalmos, lid lag and hypesthesia on forehead compared with double incisions technique.
Glutaraldehyde로 처리된 이종 및 자가 미세혈관 이식에 대한 실험적 연구
육홍미,윤진호,우동훈,김한중,김대섭 대한성형외과학회 1992 Archives of Plastic Surgery Vol.19 No.3
During microvascular procedures there frequently arises a need for a vascular graft. In this study the efficacy of preserving microvascular heterografts with glutaraldehyde tanning was investigated. These were compared with nonprepared autografts. Autogenous non-prepared rat femoral arterial grafts and glutaraldehyde-tanned rabbit femoral arterial grafts were interposed in fat femoral arteries. Ninty-one per cent and 74per cent patency rates were achieved respectively at 4weeks. This study has shown that glutaraldehyde tanning reduces the antigenicity of rabbit femoral arteries used as heterografts in the rat. This reduction in antigenicity prevented necrosis of the rabbit femoral the tendency to thrombosis, but as unacceptable occlusion rate (26% occluded) persisted. We assumed that thrombosis occurred because of incomplete reduction of the antigenicity of the heterografts. The exact mechanism resulting in occlusion of glutaraldegyde-tanned grafts is not known. Further work is therefore required to establish a tanning technique which can reduce antigenicity without leading to occlusion and without and without rendering the graft the difficult to use.