• Journal of Radiation Protection and Research
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• 제46권4호
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• pp.213-217
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• 2021

Background: Radiation exposure can occur as a result of occupational activities utilizing sources of radiation. The average level of occupational exposure is generally similar to the global average, but some workers receive more than this. In this study, the occupational exposure data for workers in Korea to check the recent trend of radiation exposure. Materials and Methods: The data collection and analysis are carried out by two separate periods based on the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) survey. One is the year 2003 to 2014 for a recent survey, and the other is 2015 to 2019. All available data were collected by annual reports from radiation dose registry organizations. Results and Discussion: The annual dose over the record level to the total workers did not change much compared with the total increasing number of workers in this period. The dose to the nuclear fuel cycle field has a tendency to decrease. It resulted from the efforts of radiation dose reduction with high technology introduced to this area. Also, it is important result that the radiation dose to the workers in radiography is remarkably reduced. Conclusion: The number of radiation workers and average doses were analyzed for occupational categories in Korea. It still needs cooperative efforts between the dose registry organizations for the efficient dose management of Korean radiation workers.

• 한국태양에너지학회 논문집
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• 제32권3호
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• pp.123-128
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• 2012

Computer simulation of buildings and solar energy systems is being used increasingly in energy assessments and design. The purpose of our work is to predict the surface temperature on inclined surfaces based on ISO-TRY typical weather data. To reach this goal, three studies were performed. They consisted of quantifying the accuracy of various well-known three models. The first type of models calculated diffuse horizontal irradiations from global ones and the second type models computed global irradiations on inclined planes from diffuse and global components on a horizontal surface. The third type of model calculated long-wave radiation and surface temperature from ISO-TRY typical weather data. The proposed model can provide an alternative to building designers in estimating the surface temperature and solar irradiation on inclined surfaces where only the typical meteorological data are available.

• 환경영향평가
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• 제24권3호
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• pp.205-216
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• 2015

전 지구와 남한, 북한, 일본 지역을 중심으로 한 동북아시아 지역에 대한 기온, 강수량, 일사량의 미래 변화를 정량적으로 평가하기 위해 총 34개 GCM에 의해 작성된 CMIP5 기후변화 시나리오를 분석하였다. 그 결과 동북아시아 지역에서 전 지구 평균보다 기온과 강수량이 증가하는 것으로 예측되었다. 특히 RCP 8.5 시나리오의 2080년대 북한 지역에서는 비록 GCM 간 예측의 불확실성이 크지만 과거 30년(1971-2000년)에 비해 기온은 $5.1^{\circ}C$, 강수량은 18% 증가하는 것으로 예측되었다. 일사량의 경우 전 지구 평균 일사량은 RCP 2.6 시나리오를 제외한 모든 RCP 시나리오에서 대체로 시간이 경과할수록 감소하는 것으로 예측되었으나 동북아시아 지역에서는 대체로 시간이 경과할수록 운량 감소의 영향으로 일사량이 증가하는 것으로 예측되었다.

• 천문학회보
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• 제19권
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• pp.11.1-11.1
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• 1994

• 한국조명전기설비학회지:조명전기설비
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• 제5권1호
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• pp.40-45
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• 1991

본 논문은 방사 지배 아아크 플라즈마에서의 광속과 방사에너지 계산을 간략화하는 기법을 새로이 제안하고 있다. 기존의 모델의 문제점은 아아크 플라즈마내의 제 특성중 특히 국부적 광속과 방사에너지를 계산하기 위하여 전체 플라즈마 공간에 대하여 3중 적분식을 수치해석적으로 풀어야 하므로 상당한 계산시간이 요구된다는 점이다. 본 논문은 이러한 방사 특성과 전체 플라즈마의 상태와의 관계를 미리 계산하고 이를 데이터화함으로써 국부적인 방사 특성의 계산을 간략화할 수 있는 새로운 방법을 제안하고 있다.

• Journal of Astronomy and Space Sciences
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• 제40권2호
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• pp.59-66
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• 2023

Since the World Health Organization (WHO) officially announced a global pandemic on March 12, 2020, the aviation industry in the world has been experiencing difficulties for a long time. Meanwhile, the Ukraine war broke out in February, and from March 15, domestic airlines must operate air routes bypassing Russian airspace despite the longer flight time. Therefore, as the flight time increases, the cosmic radiation exposure dose of the crew members is also expected to increase. Here we compare the radiation exposure dose between the route doses for the eastern United States and Europe before and after the detour route usage. Through the comparison analysis, we tried to understand how cosmic radiation changes depending on the flight time and the latitude and which one contributes more. We expect that this study can be used for the policy update for the safety management of cosmic radiation for aircrews in Korea.

• 한국태양에너지학회 논문집
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• 제30권5호
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• pp.25-31
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• 2010

A Precision Spectral Pyranometer (PSP) is mainly used as a reference to calibrate other pyranometers due to its high accuracy and sensitivity in response to the spectrum wavelength range of 0.285 ${\mu}$ to 2.8 ${\mu}$, while the sensitivity of photovoltaic-type Li-Cor pyranometer is limited within a certain spectral range from 0.4 ${\mu}$ to 1.1 ${\mu}$. In this study, two Eppley PSPs($PSP_1$ and $PSP_2$) were first compared to the calibrated Eppley PSPs from National Renewable Energy Laboratory (NREL), resulting in two linear correction factors based on the comparison between the logger output (V) from the test PSP and the solar radiation (W/m2) from the NREL PSP. The Li-Cor pyranometer used in this study was then corrected based on the comparison of measured solar radiation ($W/m^2$) from the corrected $PSP_1$ and the Li-Cor pyranometer. In addition, instrument scale corrections were also performed for the PSPs and the Li-Cor from the transmitter to the data logger. From the comparisons, a linear correction factor (1.0214) with R=0.9998 was developed for the scale correction between$PSP_1$ and $PSP_2$, while the Li-Cor pyranometer has a scale(1.0597) and offset (32.046) with R=0.9998 against$PSP_1$. As a result, it was identified that there were good agreements within ${\pm}$ 10 W/ $m^2$ between Eppley $PSP_1$ vs. $PSP_2$ solar radiation and within ${\pm}$ 20 W/$m^2$ between$PSP_1$ vs Li-Cor solar radiation after the empirical scale corrections developed in this study.

• 한국태양에너지학회 논문집
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• 제23권3호
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• pp.23-28
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• 2003

The purpose of this study is to procure basic data to be used for solar power plant and concentrating collector designs. Site elevation is one of the major factors which influences the incoming insolation to the earth surface. Because the nonpermanent gases such as ozone, water vapor are unmixed components of the atmosphere and their concentrations are the function of height, the site elevation effects the relative proportion of the atmospheric constituents. We have measured solar radiation on Jiri Mt. (1,400m) and in Gurye area(115m) at the near same latitude. These values were then compared to obtain their characteristics and to investigate the potential for the solar utilization for both high and low elevated areas. From the experimental results, we concluded that 1) Daily mean horizontal global radiation and normal beam radiation on Mt. Jiri are 9.5%, and 35.3% higher than Gurye area respectively for a clear day. 2) A significant difference in atmospheric clearness index is observed between Mt. Jiri and Gurye areas.

• 한국조명전기설비학회지:조명전기설비
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• 제5권4호
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• pp.3-7
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• 1991

본 논문은 방사 지배 아아크 플라즈마에서의 광속과 방사에너지 계산을 간략화하는 기법을 새로이 제안하고 있다. 기존의 모델의 문제점은 아아크 플라즈마내의 제 특성중 특히 국부적 광속과 방사에너지를 계산하기 위하여 전체 플라즈마 공간에 대하여 3중 적분식을 수치해석적으로 풀어야 하므로 상당한 계산시간이 요구된다는 점이다. 본 논문은 이러한 방사 특성과 전체 플라즈마의 상태와의 관계를 미리 계산하고 이를 데이타화함으로써 국부적인 방사 특성의 계산을 간략화할 수 있는 새로운 방법을 제안하고 있다.

• Journal of Radiation Protection and Research
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• 제30권4호
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• pp.161-165
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• 2005

The gamma-ray dose rates in air at 233 locations in Korea have been determined. The contribution to the gamma-ray dose rates in air due to the presence of $^{232}Th-series,\;^{238}U-series\;and\;^{40}K$ is as follows: 47.3% $(36\;nGyh^{-1})\;^{232}Th-series$ 14.5% $(11\;nGyh^{-1})\;^{238}U-series$ and 38.2% $(29\;nGyh^{-1})\;^{40}K$. The mean gamma-ray dose rate theoretically derived from $^{232}Th-series,\;^{238}U-series\;and\;^{40}K\;was\;76{\pm}17\;nGyh^{-1}$. This corresponds to an annual effective dose of $410\;{\mu}Sv$ and an annual collective dose of 18900 person-Sv for all provinces under study. The results have been compared with other global radiation dose.