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분자진동을 이용한 터널 배수공 막힘 억제의 실내시험 연구
윤세환,박은형,이종휘,천병식 한국지반공학회 2012 한국지반공학회논문집 Vol.28 No.10
Clogging of drainage pipes by scale is an important problem in civil engineering works. Although scale deposits can be removed by acid treatment or water jetting, these treatments are costly and have many disadvantages. In this study,scale samples from tunnel drainage pipes were analyzed using SEM-EDS and XRD. The main ingredient in scale was CaCO3 of the calcite crystal form. Drainage experiments and recirculation type experiments were conducted to control and remove scale deposits, which were determined through visual and weight measuring analysis. As a result, Quantum Stick has the effect of limiting formation of scale
Non-linear gain을 적용한 Automatic White Balance기법
윤세환(Se-Hwan Yun),김진헌(Jin-Heon Kim) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
In this paper, we propose a new method of automatic white balance which is one of the image signal processing techniques. Our method is conceptually based on gray world assumption. However, while previous methods generate linear results as multiplying pixel values by a gain, our method generates non-linear results using the feature of B-Spline curves. The two merits of deriving non-linear results are preventing AWB failure from transforming strong color of high level into wrong color and well preserving original contrast of an input image.
윤세환 ( Se Hwan Yun ),우성근 ( Sung Kuen Woo ),홍경옥 ( Kyung Ok Hong ) 한국호텔리조트카지노산학학회 2003 호텔리조트연구 Vol.1 No.1
This study tested the following issues to analyse the effects to the reliability, in service quality by travel agents` as well as awareness in work place fairness. The results showed that distribution fairness and process fairness had no effect on the reliability to the supervisors, interaction fairness influenced on the reliability to the supervisors.
IrMn 층이 있거나 없는 Co/Ni/Co 자성 와이어의 자기장 하에서 자구벽 Creep 운동의 관찰
윤세환(Se-Hwan Yoon),류광수(Kwang-Su Ryu),양시훈(See-Hun Yang) 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.1
In this study, we experimentally observed the domain wall creep motions under the magnetic field in the ferromagnetic Co/Ni/Co magnetic wires with or without antiferromagnetic IrMn layer, respectively, using a magento-optical Kerr microscope system capable of real-time magnetic domain observation. As a result of the observation, it was found that the strength of the magnetic field required to move the magnetic domain wall was larger in the sample with the IrMn layer than the sample without the IrMn layer, and also, it was increased as the wire width decreased. In addition, we found that the magnetic domain wall speed characteristics according to the strength of the magnetic field in the two samples were well explained by the thermally activated model assuming the domain wall creep motion.
관광종사원의 성격 특성이 직무만족에 미치는 영향에 관한 실증 연구
윤세환(Yun, Sei-hwan),박진영(Pack, Jin-young) 한국문화관광학회 2004 문화관광연구 Vol.6 No.2
The influences of the tourism employees characteristics on the job satisfaction are: 1. The openness and the extroversion of the tourism employees to experience have a positive influence on the job satisfaction. 2. The analyses of the differences regarding tourism employees characteristics identify that the women employees have a high instability, the younger employees possess a strongly extroverted characteristics, the employees who are married, make high earnings, and hold a high level of academic ability in conjunction with a prominent openness to experience are more devoted to their job. 3. The analyses of the differences regarding the job satisfaction explain that the group making high earnings, travel agency employees, the employees having the short length of service or the longest length of service, and the employees positioned on higher ranks demonstrate significant job satisfaction.