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고온의 인공해수 중 12Cr강의 부식피로특성에 관한 연구
조선영,김철한,배동호,Jo, Seon-Yeong,Kim, Cheol-Han,Bae, Dong-Ho 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.5
In this study, corrosion fatigue characteristics of 12Cr alloy steel were investigated in 3.5wt.% NaCl solution of 150$^{\circ}C$ and 4.5bar. Behavior of corrosion fatigue cracks was measured by the indirect compliance method and compared with the results in distilled water and in air. 1) 12Cr alloy steel was susceptible to temperature. Its susceptibility was increased as the temperature was increased. 2) The crack growth characteristics of 12Cr alloy steel in distilled water were similar to 3.5wt.% NaCl solution. 3) The temperature of solution affects to the crack growth characteristics of 12Cr alloy steel. In corrosion solutions of 4.5bar, 150$^{\circ}C$, fracture surfaces of corrosion fatigue crack growth at a/W=0.3 was showed the trans-granular fracture suface. As the crack grew up, it was changed to inter-granular type. In condition of high temperature, The crack growth behaviors of 12Cr alloy steel were remarkable.
12Cr 합금강의 부식특성 및 인공열화된 12Cr합금강의 피로특성
조선영,김철한,배동호,Jo, Sun-Young,Kim, Chul-Han,Bae, Dong-Ho 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.6
To estimate the reliability of 12Cr alloy steel, the material of turbine blade in the steam power plant, Its corrosion susceptibility and fatigue characteristics in NaCl and Na$_2$SO$_4$solution with the difference of concentration and temperature was investigated. The polarization tests recommended in ASTM G5 standard for corrosion susceptibility in the various corrosive solutions was estimated. It showed that the higher temperature, the faster corrosion rates and corrosion rates were the fastest in 3.5 wt.% NaCl and 1M Na$_2$SO$_4$solution. From these results, the degradation conditions were determined in distilled water, 3.5 wt.% NaCl and 1M Na$_2$SO$_4$solution at room temperature, 60$\^{C}$ and 90$\^{C}$ during 3, 6 and 9 months. Its surface had a few pits for long duration. But, it was not susceptible in sulfide and chloride condition of several temperatures. If the degraded 12Cr alloy steel and non-degraded one were compared with fatigue characteristics, Any differences were not found regardless of temperature and degradation period.
조선영,김철한,배동호,Jo, Seon-Yeong,Kim, Cheol-Han,Bae, Dong-Ho 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.6
In order to investigate the fatigue fracture characteristics by corrosion degradation of 12Cr alloy steel, both the fatigue characteristics in air of them artificially degraded during long period and the corrosion fatigue characteristics were experimentally evaluated in various environments which were determined from electro-chemical polarization tests. And also, their fracture mechanisms were analyzed and compared, fractographyically. From their results, the fracture mechanical characteristics of it artificially degraded during long period in the distilled water, 3.5 wt.% NaCl solution and 12.7wt.%(1M) Na$_2$SO$_4$solution of 25, 60 and 90$\^{C}$ did not show distinguishable difference comparing with non-corroded one in regardless of temperature and degradation period. It means that degradation of the material by just surface corrosion does not remarkably affect to fatigue crack growth. On the other hand, the crack growth rates by corrosion fatigue increased due to activity increase of corrosive factors such as OH(sub)-,Cl(sup)- and SO$_4$(sup)- at the crack tip with temperature increase. Therefore, the crack growth rates by corrosion fatigue were more faster than that in air of the artificially degraded specimen due to the such difference of crack growth mechanism.
Turbine Blade재료의 부식민감성과 부식피로특성에 관한 연구
조선영,김철한,류승우,김효진,배동호,Jo, Seon-Yeong,Kim, Cheol-Han,Ryu, Seung-U,Kim, Hyo-Jin,Bae, Dong-Ho 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.3
Corrosion characteristics on the 12Cr alloy steel of turbine blade was electro-chemically investigated in 3.5wt% NaCI and 12.7wt% Na2S04 solution, respectively. Electro-chemical polarization test, Huey test and Oxalic acid etching test were previously conducted to estimate corrosion susceptibility of the material. And, using the horizontal corrosion fatigue tester, corrosion fatigue characteristics of 12Cr alloy steel in distilled water, 3.5wt% NaCI solution, and 12.7wt%(1M) Na2S04 solution were also fracture-mechanically estimated and compared their results. Parameter considered was room temperature, 60'C and 90'C. Corrosion fatigue crack length was measured by DC potential difference method.Obtained results are as follows,1) 12Cr alloy steel showed high corrosion rate in 3.5wt% NaCI solution and Na2S04 solution at high tempratue.2) Intergranular corrosion sensitivity of 12 Cr alloy was smaller than austenitic stainless steel.3) Corrosion fatigue crack growth rate in 3.5wt% NaCI and 12.7wt%(IM) Na2S04 solution is entirely higher than in the distilled water, and also increased with the temperature increase.
메디컬스킨케어 에스테티션의 직무만족이 서비스 품질에 미치는 영향 분석
조선영 ( Seon Young Jo ) 대한미용학회(구 대한미용과학회) 2017 대한미용학회지 Vol.13 No.3
Job satisfaction of aestheticians with high intimacy and contact time with customers is significant since it offers high quality services and achieves result of hospital organizational performance. The aim of the current study is to find the influence of job satisfaction on service quality by surveying Medical Skincare Aestheticians who work at hospitals in Seoul and Incheon. Results show that the job satisfaction related factors which includes business result, work satisfaction, and colleagueship had positive influence on job satisfaction, while the four factors of human service quality, viz. certainty, empathy, reliability and responsiveness showed different influences depending on the subjects` general feature. Furthermore, job satisfaction on coworker relationship showed the largest influence on service quality, sequentially followed by competency and work satisfaction. In conclusion, to maintain high competitiveness in Medical skincare market, administration and manpower management are required to raise job satisfaction of the aestheticians who are actually contacting and approaching the customers. Moreover, effort to improve customer satisfaction is also required by understanding consumers` needs on their propensity and increasing service satisfaction.
조선영(Seon-Yeong Jo),김종훈(Jong-Hun Kim),김정호(Jung-Ho Kim),조겸래(Kyeum-Rae Cho),이대우(Dae-Woo Lee) 한국항공우주학회 2010 韓國航空宇宙學會誌 Vol.38 No.4
UAV는 임무 수행을 위한 INS 장비와 광학 장비를 갖추고 있다. 이 논문에서는 UAV를 위한 알고리즘으로 칼만 필터와 광류를 이용하는 영상기반 자세추정 알고리즘을 제안한다. 광류는 UAV에 장착된 카메라의 영상으로부터 획득하며 UAV의 자세는 광류를 통해 측정된다. 이 논문에서 UAV 자세의 추정과 낮은 신뢰성을 보완하기위해 칼만 필터를 사용한다. 그리고 실험을 통해 알고리즘을 검증하였다. Rate table과 실제 비행영상을 이용하여 실험 하였으며, 본 논문에서 UAV의 자세 추정 알고리즘 검증 결과를 보였다. Rate table 실험에서 오차는 2도 이내였으며, AHRS를 통해 측정한 결과와 비슷한 경향을 보인다. 그러나 실제 비행 영상 실험에서 최대 Yaw 오차는 21도였으며, 최대 Pitch 오차는 7.8도로 나타났다. UAV (Unmanned Aerial Vehicle) have an INS(Inertial Navigation System) equipment and also have an electro-optical Equipment for mission. This paper proposes the vision based attitude estimation algorithm using Kalman Filter and Optical flow for UAV. Optical flow is acquired from the movie of camera which is equipped on UAV and UAV's attitude is measured from optical flow. In this paper, Kalman Filter has been used for the settlement of the low reliability and estimation of UAV's attitude. Algorithm verification was performed through experiments. The experiment has been used rate table and real flight video. Then, this paper shows the verification result of UAV's attitude estimation algorithm. When the rate table was tested, the error was in 2 degree and the tendency was similar with AHRS measurement states. However, on the experiment of real flight movie, maximum yaw error was 21 degree and Maximum pitch error was 7.8 degree.
실버세대 여성들의 화장에 대한 태도와 화장품 구매행동에 관한 연구
조선영 ( Seon Young Jo ),김주덕 ( Ju Duck Kim ) 한국미용학회 2009 한국미용학회지 Vol.15 No.4
As the life expectancy of human being becomes enlarged owing to economic growth and advanced medical technology, aging population has emerged as a worldwide phenomenon. In Korea, as aging population phenomenon becomes spotlighted as a social issue, there are increasing interests in silver generation. In particular, women in silver generation are highlighted as a class with consumer impact and purchasing power owing to their changing values and improved financial capacity under the influence of changing social environment. Thus, this study targets women in silver generation at age 55 or older so as to survey and analyze their attitudes to makeup, their interests in makeup, and their actual use and purchase of cosmetics, so that it can forecast their potential purchasing and consuming impact on cosmetic industry and estimate future growth potential of silver cosmetics market in domestic cosmetics industry. Hopefully, it is expected that the results of this study will contribute to preparing effective marketing policies including product planning and promotion strategy for silver cosmetics to be developed in near future.