• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2004년도 학술발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
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• pp.248-253
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• 2004

• 한국환경과학회지
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• 제28권2호
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• pp.277-285
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• 2019

Heat watch warning systems are operating in Korea and several other countries (China, the United Kingdom, France, the United States, Germany, Australia, and Japan). The heat wave indices used in this system are the heat index, perceived temperature, the wet bulb globe temperature, and the daily maximum temperature. To improve the heat wave advisory and warning system, some suggestions have been made. The meteorological-health index (i.e., indirect index), has especially been proposed in previous studies. This information should be provided not only to vulnerable groups (seniors, infants, and children), but also to outdoor workers who may be particularly exposed to heat waves. In addition, to have sufficient preemptive response times, the need for an extension of the heat watch warning period was suggested. Finally, the subdivision of administrative units and risk stages was proposed.

• 한국지구과학회지
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• 제40권3호
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• pp.259-271
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• 2019

동해 연안지역의 고해상도 파랑예측을 위하여 통계적 규모축소화 방안을 적용하여 고해상도 동해 연안 파랑예측시스템을 구축하였다. 예측시스템을 구축하기 위하여 기상청 현업에서 예측된 동해 및 남해 연안파랑예측모델과 전구파랑예측모델의 예측결과를 이용하였다. 3일까지는 연안파랑예측모델들의 결과를 그대로 활용하였고 3일 이후 7일까지는 전구파랑예측모델의 예측결과를 통계적 규모축소화 방안(역거리 가중 내삽방법과 조건부합성방법)을 적용하여 예측하였다. 예측된 고해상도 연안예측시스템을 이용하여 예측된 파고의 2차원 공간분포는 연안예측모델의 초기장(분석장)과 자기상관관계를 이용하여 검증하였고 부이 등 해양관측소 자료를 이용하여 파고 및 풍속 예측을 검증되었다. 수치모델의 예측성능과 유사하게 초기시간에는 예측성능이 높게 나타났으나 시간이 지남에 따라 예측성능이 점진적으로 감소되었다. 전체 기간의 파고 예측결과를 파고 관측자료를 이용하여 검증하였을 때 역거리 가중 내삽과 조건부합성방법 적용에 따른 상관계수와 평균 제곱근 오차는 0.46과 0.34 m에서 0.6과 0.28 m로 개선되었다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제16권5호
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• pp.702-712
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• 2016

A wrist watch type wearable cardiovascular monitoring device is proposed for continuous and convenient monitoring of the patient's cardiovascular system. For comprehensive monitoring of the patient's cardiovascular system, the concurrent electrocardiogram (ECG) and arterial pulse wave (APW) sensor front-end are fabricated in $0.18{\mu}m$ CMOS technology. The ECG sensor frontend achieves 84.6-dB CMRR and $2.3-{\mu}Vrms$-input referred noise with $30-{\mu}W$ power consumption. The APW sensor front-end achieves $3.2-V/{\Omega}$ sensitivity with accurate bio-impedance measurement lesser than 1% error, consuming only $984-{\mu}W$. The ECG and APW sensor front-end is combined with power management unit, micro controller unit (MCU), display and Bluetooth transceiver so that concurrently measured ECG and APW can be transmitted into smartphone, showing patient's cardiovascular state in real time. In order to verify operation of the cardiovascular monitoring system, cardiovascular indicator is extracted from the healthy volunteer. As a result, 5.74 m/second-pulse wave velocity (PWV), 79.1 beats/minute-heart rate (HR) and positive slope of b-d peak-accelerated arterial pulse wave (AAPW) are achieved, showing the volunteer's healthy cardiovascular state.

• 한국콘텐츠학회논문지
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• 제20권5호
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• pp.525-535
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• 2020

본 연구의 목적은 공공부문에서 활용되는 기상청의 여름철 폭염특보 정보의 가치를 평가하는 것이다. 폭염특보는 각 지방자치단체에서 매년 발생하는 고온 피해를 저감하기 위한 대비계획의 행동 수준을 결정하는 주요 투입변수로 활용되고 있다. 비 시장재인 폭염특보 정보의 가치를 평가하기 위해 비용-손실을 고려한 의사결정모델을 수립하였다. 의사결정모델 변수인 비용과 손실은 각각 서울과 부산에서 2016년 사용한 폭염 대책 예산과 건강보험심사평가원이 제공하는 65세 이상 고령자의 건강보험 청구금액으로 설정하였다. 분석 결과 2016년 기상청 폭염특보는 서울과 부산에 각각 41.3억 원과 10.9억 원의 가치를 제공한 것으로 평가되었다. 또한 기상청이 폭염특보의 False Alarm (FA) 오류를 1회 줄이면 서울과 부산에서 각각 76.6백만 원, 16.8백만 원의 가치가 증가하는 것으로 나타났다. 연구 결과는 공공부문에서 활용되는 폭염특보의 가치를 정량적으로 추정한데 의의가 있다.

• 통상정보연구
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• 제8권4호
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• pp.231-254
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• 2006

This article is intended to investigate how the Japanese consumers have changed the country image on Korea, the evaluation toward products manufactured by Korea and the willingness to buy Korean products through the experience of Korean Wave. So the country image, the evaluation and the willingness were compared between the before and after experiencing Korean Wave The empirical result said that during the span of Korean Wave the country image and the evaluation have improved, but the intentions to purchase Korean products are still not positive in Japan. So an additional analysis was made to find the reason of the unwillingness to buy Korean products. Although they regard Korean products as qualitatively good against price, they seldom know Korean brand, hardly watch korean product's advertisement. Especially the intentions to purchase Korean products in durable goods was lower than in consuming goods.

• 한국해양공학회지
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• 제30권4호
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• pp.320-326
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• 2016

Rip current forecasts, based on intensity, are marked in four levels—notice, watch, warning, and danger. However, numerical results are represented by current vectors, whose magnitudes are then converted into predictive levels. In the present study, the rose diagram is adapted as a determinative forecasting index and examined for the case of an ideal rip channel consisting of surface, bottom, and averaged currents. Further, it is employed in the sensitivity analysis of wave-induced currents generated by wave conditions at the Haeundae Beach. The simulation of surface onshore and bottom undertow currents is accomplished by including a mass flux term in the wave-averaged continuity equation.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.89-92
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• 2008

The extreme heat watch warning system(EHWWS) that Korea Meterological Administration carried out a preliminary from July 1, 2007, considered both daily maximum temperature and daily maximum heat index simultaneously. It was requested revision of the standard level of EHWWS to solve the difficulty of forecasting occurred when we were considering two parameters simultaneously and we did not considering heat index according to areas. For this, we established three type standard, such as type 1 that considered both daily maximum temperature and daily maximum heat index, Under the extreme heat day that daily minimum temperature was more than $25^{\circ}C$, type 2 that considered daily maximum temperature and type 3 that considered only daily maximum heat index and then analyzed whether these 3 types satisfies the excess mortality of the extreme heat warning or not. As a results, type 1 and 2 were more explain away excess mortality each warning step than type 3. type 2 could also apply case of not to consider heat index according to areas and had a merit for extreme heat forecasting easily because the standard was simple. Therefore we think type 2 is more suitable and reasonable standard for Korea extreme heat watch warning system(KEHWWS) than type 1. In addition, we need to develop model that exactly predicts the excess mortality will be take place during the extreme heat warning and construct KEHWWS.

• Ocean and Polar Research
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• 제43권3호
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• pp.179-192
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• 2021

In this study, an integrated wave model from global to coastal scales was developed to improve the operational wave prediction performance of the Korean Meteorological Administration (KMA). In this system, the wave model was upgraded to the WaveWatch III version 6.07 with the improved parameterization of the source term. Considering the increased resolution of the wind input field and the introduction of the high-performance KMA 5^th Supercomputer, the spatial resolution of global and regional wave models has been doubled compared to the operational model. The physical processes and coefficients of the wave model were optimized for the current KMA global atmospheric forecasting system, the Korean Integrated Model (KIM), which is being operated since April 2020. Based on the sensitivity experiment results, the wind-wave growth parameter (β_max) for the global wave model was determined to be 1.33 with the lowest root mean square errors (RMSE). The value of β_max showed the lowest error when applied to regional/coastal wave models for the period of the typhoon season when strong winds occur. Applying the new system to the case of August 2020, the RMSE for the 48-hour significant wave height prediction was reduced by 13.4 to 17.7% compared to the existing KMA operating model. The new integrated wave prediction system plans to replace the KMA operating model after long-term verification.

• 한국멀티미디어학회논문지
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• 제23권7호
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• pp.862-869
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• 2020

This study attempted to analyze human brain responses toward visual content through EEG signals and intended to measure brain wave reactions of different age groups to determine the sexuality level of the media. The experimental stimuli consist of three different video footage (rated ages 12, 15, and 18) to analyze how subjects react in situations where they actually watch sexual content. For measuring and analyzing brain wave reactions, EEG equipment records alpha, beta, and gamma wave responses of the subjects' left and right frontal lobes, temporal lobes, and occipital lobes. The subjects of this study were 28 total and they are divided into two groups. The experiment configures a sexual content classification scale with age or gender as a discriminating variable and brain region-specific response frequencies (left/right, frontal/temporal/occipital, alpha/beta/gamma waves) as independent variables. The experimental results showed the possibility of distinguishing gender and age differences. The apparent differences in brain wave response areas and bands among high school girls, high school boys, and college students are found. Using these brain wave response data, this study explored the potential of developing algorithm for measurement of age-specific responses to sexual content and apply it as a film rating.