• 수산해양기술연구
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• 제17권1호
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• pp.19-28
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• 1981

Accuracy of the position fix obtained by navigation with Omega in the capacity of worldwide navigation depends on the predicted propagation correction. The authors observe continuously the phase differences of the A-C pair and the A-E pair from April 17 to October 14, 1980, at Busan(35\ulcorner07'. 9N, 129\ulcorner06'. 3E), and analyze the characteristic of daily variation the relation between the theoretical PPC and the measu red PPC to study the accuracy of the position fix. The results are as follows: 1. The results of fourier's analysis for the theoretical PPC and the measured PPC are positive correlation in the coefficients ao, a2, a3 with A-C pair and in the coefficients aO-a3 with A-E pair, and those PPC are apparent to daily periodicity during all measured time. The initial phase is around to 280\ulcorner with A-C pair and 1800 with A-E pair. 2. Daily variatons of the phase difference tend to decrease and the time width to narrow from April toward July, but these variations are opposed to those from July toward October. 3. Mean value of total errors of the position fix by theoretical PPC is 2.67 miles and its standard deviationis O.90miles. 4. Mean value of total errors of the position fix by the measured PPC is 0.63 miles and its standard deviation is 0.217 miles.

• 한국대기환경학회지
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• 제22권2호
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• pp.223-233
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• 2006

We analyzed the monthly and seasonal mean of the daily Erythemal Ultraviolet-B (EUV-B, $280{\sim}320nm$) irradiance operating in Pohang, Anmyeon, Gosan, Mokpo and Kangnung with UV-Biometer (Solar Light Co., Model No. 501) at clear-sky noon during the period from 1999 to 2004. Also, we investigated the seasonal and regional characteristics for the UV index over the Korean Peninsula. The daily maximum occurred near solar southing time and the highest monthly accumulated EUV-B irradiance appeared in July and August at each regional observatory. The monthly mean value of the clear-sky EUV-B irradiance in Pohang, Anmyeon, Gosan, Mokpo and Kangnung showed 196.6, 161.8, 221.9, $171.5mWm^{-2}\;and\;179.7mWm^{-2}$ near noon in July respectively. The annual mean value of the daily accumulated EUV-B irradiance in Pohang, Anmyeon, Gosan, Mokpo and Kangnung were 1.8, 2.1, 2.2, $1.8kJm^{-2}\;and\;1.5kJm^{-2}$ respectively. The UV Index (UVI) showed above UVI 7(High) more than 90 days during one year over the Korean Peninsula.

• 대한방사선치료학회지
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• 제23권1호
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• pp.51-58
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• 2011

목 적: 본 연구에서는 본원에서 보유하고 있는 선형가속기 Clinac IX과 21EX (Varian, Palo Alto, CA)에 대하여 2008년부터 2010년까지 CHECKMATE$^{TM}$ (Sun Nuclear, Melbourne, FL)를 이용하여 측정한 일일 출력 값을 바탕으로 절대 선량에 대한 오차 범위를 평가함으로써 그 유용성을 확인하고자 하였다. 대상 및 방법: 일일 정도 관리는 Varian사의 21EX, IX 두 대의 선형가속기의 광자선(6 MV, 10 MV)을 대상으로 매일 치료시작 전 CHECKMATE$^{TM}$를 사용하여 측정되었고, 절대선량은 격주간격으로 물 팬텀을 이용하여 측정되었다. 21EX의 경우 2008년부터 2010년, IX는 2009년부터 2010년까지의 일일 정도 관리의 측정치와 절대선량 측정치의 데이터 값을 분석하였다. 각 데이터는 Excel 2007 (Microsoft, USA)을 이용하여 평균, 표준편차, 신뢰수준을 평가하였고, CHECKMATE$^{TM}$의 측정값과 절대선량의 유의성을 확인하기 위하여 각 데이터의 오차 값을 각각 비교 분석하였다. 결 과: 관찰 기간 동안 두 장비의 절대선량의 출력은 시간이 지남에 따라 점차 증가함을 보였고, 이 증가는 6 MV와 10 MV 두 에너지 모두에서 비슷한 양의 증가 추세를 보이고 있었다. 또한 CHECKMATE$^{TM}$의 측정치와 절대선량 값의 오차율은 모두 0.34 이하로 나타나 두 측정값이 서로 유의관계가 있음을 보였다. CHECKMATE$^{TM}$ 측정값이 상향됨을 확인 후 이를 조정하기 위하여 절대선량 측정하였고, 오차범위 2~3%에 근접한 경우 출력 값을 교정한 횟수는 21EX는 4회, IX는 3회였다. 결 론: CHECKMATE$^{TM}$를 이용하여 2년 동안 일일 출력 변화를 측정하고 분석한 결과, 품질 관리 시 준수해야 하는 출력 값이 허용 오차 범위 2~3% 내에서 절대선량의 측정값들과 유의성이 있음을 보였다. 따라서 선형가속기의 보다 효율적이며 신뢰도가 있는 일일 출력 검증을 위하여, CHECKMATE$^{TM}$의 사용을 고려할 수 있다. 또한 각 기관에서의 선형가속기 출력 값의 변화 추세를 파악하고 각 출력 값 교정에 참고할 수 있는 좋은 기준이 될 수 있다고 사료된다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.207-210
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• 2003

In this research analyzed the daily precipitation depths of 4 climatic stations in south eastern part of Korea. It aimed to present some indices for regionalization of the area. The items are frequency distributions of precipitation quantity and days and the longest days less than class limit set up by arithmetic differences. The regression analysis between class value and frequency show very good correlation coefficients better than 0.99 which are cubic equation for the precipitation, exponential equation for the precipitation days, and first degree equation for the longest day less than class limit.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2004년도 춘계학술발표대회 논문집
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• pp.91-94
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• 2004

The purpose of this study is to inquire the change of residential value in the phenomena related with apartment living culture for recent 10 years. To investigate the apartment culture and residential values, articles in daily newspapers, which is related to 'apartment,' has been analysed by theme divided into physical, behavioral, valuable aspects. As a result, it han found that there were higher concern about economic value the any other values. Also, some of recent trands was found out in this study, such as, high quality, diversification, identity, healthy life, etc. Here this study is purposed to serve exploring the basis of healthier living culture for the future.

• 대기
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• 제18권4호
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• pp.397-416
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• 2008

This study investigates a long-term variation of the annual extreme value for the instantaneous wind speed and the daily precipitation during 56 years (1951-2006) in Korea. Results show that there is a uptrend for both wind and precipitation extreme records, although regional trends are different from overall pattern in some places, particularly for wind speed. The estimated linear trends are 230 mm/56 yr in the daily precipitation and $15ms^{-1}$/56 yr in the maximum instantaneous wind speed. For precipitation, other indexes such as total annual precipitation, the number of extreme precipitation event, and precipitation intensity have dramatically increased as well, while there has been a clear downtrend for the number of strong wind events (> $14ms^{-1}$). It is found that the minimum surface pressure recorded during typhoon attacks in Korea tends to be decreasing, about 10 hPa/56 yr. This partly explains why the extreme values in the precipitation are increasing in Korea.

• The Plant Pathology Journal
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• 제36권5호
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• pp.406-417
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• 2020

Early warning services for crop diseases are valuable when they provide timely forecasts that farmers can utilize to inform their disease management decisions. In South Korea, collaborative disease controls that utilize unmanned aerial vehicles are commonly performed for most rice paddies. However, such controls could benefit from seasonal disease early warnings with a lead time of a few months. As a first step to establish a seasonal disease early warning service using seasonal climate forecasts, we developed the EPIRICE Daily Risk Model for rice blast by extracting and modifying the core infection algorithms of the EPIRICE model. The daily risk scores generated by the EPIRICE Daily Risk Model were successfully converted into a realistic and measurable disease value through statistical analyses with 13 rice blast incidence datasets, and subsequently validated using the data from another rice blast experiment conducted in Icheon, South Korea, from 1974 to 2000. The sensitivity of the model to air temperature, relative humidity, and precipitation input variables was examined, and the relative humidity resulted in the most sensitive response from the model. Overall, our results indicate that the EPIRICE Daily Risk Model can be used to produce potential disease risk predictions for the seasonal disease early warning service.

• The Korean Journal of Physiology
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• 제4권2호
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• pp.69-81
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• 1970

These studies were carried out on 176 persons ranging in age from 20 to 50 years to determine the basal metabolic rates, energy expenditure of various activities, and daily energy expenditure of service personnel in Korea. The measurements of basal metabolic rates were made on 42 subjects by indirect calorimetry using a Douglas' bag and Scholander's gas analyzer. The energy expenditures of various activities of daily life were also measured. The greatest increase in ratio of energy expenditure in the basis of resting metabolism was 277.3% in floor sopping and the least was 40.9% during hair cutting by beauticians. The assessment of the dailly energy expenditure for each subject was made by the factorial method, using a record of their activities throughout each of 24 hours of every survey day. Certain activities were recorded in minute units. The total daily energy expenditure is the sum of all energy expenditure. This was calculated by multiplying the caloric value of the metabolic rate by the time spent on each activity. The result of the total daily energy expenditure records for 17 occupations are summarized. In respect to the daily energy expenditure, most of the occupations are moderate or light work. But the janiter (F), laundress, cook (F), room maid and nurse's aid do heavy work.

• 한국물환경학회지
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• 제29권1호
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• pp.55-65
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• 2013

It is very difficult to apply stream flow data directly to the management of Total Maximum Daily Loads because there are some differences between the unit watershed and the stream flow monitoring network in their characteristics such as monitoring locations and its intervals. Flow duration curve can be developed by linking the daily flow data of stream monitoring network to 8 day interval flow data of the unit watershed. This study investigated the current operating conditions of the stream flow monitoring network and the flow relationships between the unit watershed and the stream flow monitoring network. Criteria such as missing and zero value data, and correlation coefficients were applied to select the stream flow reference sites. The reference sites were selected in 112 areas out of 142 unit watersheds in 4 river basins, where the stream flow observations were carried out in relatively normal operating conditions. These reference sites could be utilized in various ways such as flow variation analysis, flow duration curve development and so on for the management of Total Maximum Daily Loads.

• 실천공학교육논문지
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• 제14권3호
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• pp.609-615
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• 2022

This study aims to investigate the relationship between quality of life, activities of daily living, and depression among Korean super-aged women. In this study, the 7th (2018) data of the Korean Longitudinal Study of Aging (KLoSA) were used. The participants in this study were 363 super-aged women. The mean age was 88.67 years old. Quality of life was significantly related with Activities of daily living (ADL) (r = .34, p < .001), and depression (r = -.47, p < .001). The analysis of the hypothesized model showed a good fit to the data except for the χ² value (χ² = 38.8, df = 11, p < .001, CFI = .98, TLI = .96, RMSEA = 0.08). The hypothesized model explained 34% of the variance in super-aged women. The activities of daily living of elderly women had an indirect effect on quality of life via depression. Very old women with a high level of ADL were more likely to be feeling less depression, and elderly people who had less depression were likely to have a better quality of life. The findings thus highlight prevailing depression and activities of daily living as critical foci for clinical management strategies in super-aged women.