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농림위성영상 정밀센서모델링 효율성 재고를 위한 최적의 해상도 및 지상기준점 칩 개수 분석
최현경,김태정,Choi, Hyeon-Gyeong,Kim, Taejung 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6
Compact Advanced Satellite 500-4 (CAS500-4), which is scheduled to be launched in 2025, is a mid-resolution satellite with a 5 m resolution developed for wide-area agriculture and forest observation. To utilize satellite images, it is important to establish a precision sensor model and establish accurate geometric information. Previous research reported that a precision sensor model could be automatically established through the process of matching ground control point (GCP) chips and satellite images. Therefore, to improve the geometric accuracy of satellite images, it is necessary to improve the GCP chip matching performance. This paper proposes an improved GCP chip matching scheme for improved precision sensor modeling of mid-resolution satellite images. When using high-resolution GCP chips for matching against mid-resolution satellite images, there are two major issues: handling the resolution difference between GCP chips and satellite images and finding the optimal quantity of GCP chips. To solve these issues, this study compared and analyzed chip matching performances according to various satellite image upsampling factors and various number of chips. RapidEye images with a resolution of 5m were used as mid-resolution satellite images. GCP chips were prepared from aerial orthographic images with a resolution of 0.25 m and satellite orthogonal images with a resolution of 0.5 m. Accuracy analysis was performed using manually extracted reference points. Experiment results show that upsampling factor of two and three significantly improved sensor model accuracy. They also show that the accuracy was maintained with reduced number of GCP chips of around 100. The results of the study confirmed the possibility of applying high-resolution GCP chips for automated precision sensor modeling of mid-resolution satellite images with improved accuracy. It is expected that the results of this study can be used to establish a precise sensor model for CAS500-4.
보건소 보건의료직 종사자들의 감정노동, 자기효능감 및 소진의 관계
최현경,하영미,양승경,Choi, Hyunkyung,Ha, Yeongmi,Yang, Seungkyoung 한국직업건강간호학회 2016 한국직업건강간호학회지 Vol.25 No.1
Purpose: The purpose of this descriptive, cross-sectional study was to examine relationships among emotional labor, self-efficacy, and burnout of employees in public health centers. Factors that influence burnout of workers were also assessed. Methods: One hundred sixty six workers in public health centers completed a pack of self-report questionnaires. Collected data were analyzed using descriptive statistics, t-test, one-way ANOVA along with $Scheff{\acute{e}}$ test, and stepwise multiple regression. Results: Employees in public health centers seemed to experience emotional labor to some extent. There were statistically significant differences in burnout depending on the age of workers. Employees' burnout had a positive relationship with emotional labor and a negative relationship with self-efficacy. Factors influencing burnout of employees in public health centers were emotional dissonance, surveillance & monitoring of organization, age, and self-efficacy. Conclusion: Considering the findings from this study, health care providers need to develop effective interventions which increase the level of self-efficacy and decrease certain types of emotional labor for employees in public health centers and to help them effectively manage burnout.
최현경(Hyun-Kyung Choi),조웅(Woong Cho) 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.12
국내에서는 대중교통 내에서 사회적 약자를 위한 노약자석과 더불어 임산부석을 제공하고 있다. 그러나, 임산부가 임산부석에 접근하더라도 임산부임을 인지하지 못하거나 무시함으로써 임산부석에 대한 활용도가 떨어진다. 본 논문에서는 현재 임산부석의 문제점에 대해 알아보고, 무선통신기술을 이용하여 임산부가 임산부석에 접근시 이를 주위에 알려주는 임산부 알림 서비스에 대해 제안한다. 먼저 서비스의 개념 및 시나리오에 대해 소개한 후 서비스를 가능하게 하는 무선통신기술과 관련한 각 기술들의 특징에 대해 알아본다. 또한 실제 시스템 구현을 위해 고려해야 할 사항들에 대해 논의한다. In Korea, the special seats for vulnerable users such as the elderly and pregnant woman are provided. However, the usage of seats is very low due to the ignoring or lack of recognition about pregnant woman even though pregnant woman approaches the seat. In this paper, we first consider the problem of special seats for pregnant woman and propose the wireless communication based pregnant alarm service which announces approaching of pregnant woman when pregnant woman moves toward the seats for pregnant woman. First, the service concept and scenario are introduced. Then, we deal with wireless communication technologies which provides the alarm service and their properties. In addition, we discuss implementation issues for realizing the proposed system
항산화성 바이오 미네랄 활성수에 의한 항노화 및 미백효과
최현경 ( Hyun Kyung Choi ),오명진 ( Myoung Jin Oh ),허명준 ( Myeong Jun Her ),경경환 ( Kyeong Hwan Kyeong ),박장서 ( Chang Seo Park ) 대한화장품학회 2009 대한화장품학회지 Vol.35 No.1
자외선에 노출된 피부는 활성산소종을 형성한다. 이는 피부의 염증 반응을 야기시키며 콜라겐 생성 억제를 통해 피부 노화를 촉진시킨다. 본 연구에서는 2종류의 항산화성 미네랄 바이오 활성수1과 2(MIBA-W1, MIBA-W2)를 이용하여 항염증 및 항노화 기초 효능과 함께 미백효능을 측정하였다. 두 종류 MIBA-W 모두가 UV에 의해 증가된 TNF-α를 상당량 줄여주는 것으로 나타나 항염증 효능이 있는 것이 확인되었다. 한편 UVB에 의해 감소되는 콜라겐 합성량은 MIBA-W1에 의해 0.01 % 농도에서 대조군 수준으로 증가하였으나 MIBA-W2는 농도가 증가할수록 콜라겐 합성량이 증가하는 경향을 보였다. 한편 MIBA-W2는 α-MSH로 처리된 B16-F1 melanoma 세포에서의 멜라닌 합성을 억제하는 것이 관찰되었다. MIBA-W2 의 경우 고형분 0.001 % (부피비 5 %)의 농도에서 α-MSH에 의한 멜라닌의 합성을 α-MSH positive control 대비 약 50 % 감소시키는 효과를 보였다. 종합하면 두 종류의 MIBA-W는 항염증 효능과 미백기능을 가지는 피부생리활성을 가지고 있는 것이 확인되었으며 따라서 기능성화장품 소재로 개발될 수 있는 가능성을 보였다. UV irradiated skin cells produce reactive oxygen species (ROS). ROS is known to be the primary cause of skin inflammation that is eventually leading to skin aging through decrease of collagen in the dermis. In this study, we evaluated basic efficacy of anti-aging, anti-inflammation and anti-melanogenesis using two antioxidative mineral- bio waters (Mineral-bio water 1 (MIBA-W1) and Mineral-bio water 2 (MIBA-W2)). Both antioxidative mineral- bio waters reduced TNF-α expression which was induced upon UV irradiation. MIBA-W 1 increased collagen synthesis from UVB irradiated fibroblast at 0.01 % concentration but MIBA-W2 shows slight, but linear increase. Stimulation of melanogenesis by α-MSH treatment in the cultured B16-F1 melanoma was significantly reduced by the treatment of MIBA-W2 in a dose dependent manner. Taken together, antioxidative MIBA-W1 and 2 seem to have potential applications as functional cosmetic materials.
차량용 Active Roll Control 스테빌라이저바의 성능특성 연구
최현경(Hyunkyung Choi),박치형(Cheehyung Park),김준태(Joontae Kim),전필선(Pilsun Jun),이용원(Yongweon Lee),유한덕(Handeog You),박효근(Hyogeun Park),최성진(Sungjin Choi),전광기(Kwanki Jeon) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
An experimental study was performed to understand functional characteristics of the ARC(Active Roll Control) stabilizer bar controled roll by varying stiffness of stabilizer bar as operating actuator. ARC system can reduce the vehicle movement due to the vehicle cornering or excessive maneuver at the on-road or off-road. And this system can help that increase the comfortable to ride, control stability, and to prevent rollover of the vehicle. ARC stabilizer bar consists of ECU, actuators(BLDC Motor & Gear), stabilizer bars and is installed front and rear suspension system. We tested ARC stabilizer bar by using test bench of simulating vehicle roll motion. From the test result, roll angle will be reduced if ARC system applies to vehicle.
철도레일 부근 토양의 다환방향족 탄화수소 및 중금속 오염도 조사
최현경 ( Hyun-kyung Choi ),윤인주 ( In-ju Yoon ),신태천 ( Tae-cheon Shin ),김영훈 ( Young-hun Kim ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.11
Trains have been a major means of transport in Korea during these past decades. However, train facilities such as stations and repair shops are contaminated with organic and inorganic substances. There is a high probability of train facility contamination with polyaromatic hydrocarbons (PAHs). This study evaluated the PAH and heavy metal contamination of soil near railroads in the Kyungpook area. A total of 18 soil samples were collected from the railroads and analyzed for 16 PAHs and 6 heavy metal species. The contamination level of the top soil was found to be slightly higher than that of the subsoil for contamination with PAHs. The ratio of carcinogenic PAH concentration to the total PAH concentration was relatively high, with a maximum of 0.9. The toxicity equivalent (TEQ) of the PAHs were 500.6 ng/kg in the topsoil and 355.5 ng/kg in the subsoil. The ratio of low molecular PAHs (LPAHs) to high molecular PAHs (LPAHs) ranged from 6.7 to 29.5; this shows that contamination is primarily due to combustion of fuel rather than due to petroleum. The ratio of phenanthrene to anthracene and the ratio of fluoranthene to pyrene also show that contamination occurred due to combustion for transportation. The heavy metal contamination level was lower than the Korean standard, but higher than the background concentration; this indicates that the soil was affected by the operation of the railways.