• Electrical & Electronic Materials
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• v.5 no.2
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• pp.224-236
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• 1992

본 논문에서는 내부전극을 갖는 마이카-에폭시 복합시료의 계면정합상태에 따른 계면층에서의 절연파괴특성에 대해 조사 연구하였다. 실험결과, 계면은 이상수지층으로 작용되며 마이카는 계면결합제와의 화학적반응 및 흡착에 의해 친수성이 적어짐을 확인하였고 또한 계면의 정합상태는 계면결합제의 수용액 농도에 의해 좌우되었다. 계면정합이 불량하면 인가전압의 상승에 따라 부분방전량의 증가 및 발생빈도의 직선적인 증가 특성이 보이며 계면정합이 양호한 경우는 방전량이 포화되는 시점에서 발생빈도는 지수함수적으로 증가되었다.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.168-172
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• 2004

본 연구에서는 지점빈도해석의 단점을 보완하기 위해 지역화의 개념을 사용한 지역빈도해석을 수행하였다. 지점빈도해석은 수문자료의 관측기간이 짧은 경우 정확도에 문제를 발생시킬 수 있으므로 지점 내 충분한 수의 자료 확보가 선행되어야 하나, 우리나라의 경우 지점별로 자료수가 많지 않기 때문에 지역빈도해석을 통해서 보다 정확하고 안정적인 확률수문량을 산정할 수 있다. 본 연구에서는 한강유역의 강우자료 선별을 통해서 신뢰성 있는 자료를 구축한 후, Regional Shape Estimation법과 Index Flood법을 사용한 지역빈도해석을 각각 실시하여 지점빈도해석을 시행한 결과와 비교 분석하였다. 그 결과, 한강유역의의 경우 Regional Shape Estimation 법보다 Index Flood 법이 약간 우수하게 나타났으며, 이질성이 내포되어 있는 경우라도 지점빈도해석보다는 지역빈도해석 기법이 우수하게 나타났다. 국내의 경우와 같이 관측 자료기간이 짧은 경우에는 지점빈도해석 기법보다는 지역빈도해석 기법을 적용하는 것이 보다 신뢰할 수 있는 확률수문량을 도출할 수 있을 것으로 판단된다.

• Journal of the Korean Society of Hazard Mitigation
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• v.3 no.3 s.10
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• pp.125-132
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• 2003

In this study, safety analysis of river in flash flood due to local extraordinary rainfall was conducted for the Hong-Je river, which was selected as a representative sample basin because it is one of the most urbanized rivers in Seoul. The rainfall data of precipitation 310.1 mm and probable maximum precipitation (PMP) 740.0 mm in July $14{\sim}15$, 2001 was used to perform safety analysis. Resulting of safety analysis of the flood control in Hong-Je river, case of the 50 year of design frequency, safety section, management section, and danger section were represented to be 85%, 15%, and 0% respectively. For the 200 year of design frequency, safety section decreased by 6% and management section and danger section increment by 4% and 2%, respectively, The variation of management section was not observed with respect to 200 year of frequency. Little variation of safety value for management section for 300 and 500 of frequency increased by 8% and 12% relative to 50 year of frequency, respectively. management section and danger section for 1000 year of frequency increased by 19% and 13% relative to 50 year of frequency.

• Journal of Korean Society for Geospatial Information Science
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• v.23 no.2
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• pp.3-9
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• 2015

Since changes in land use in urban space cause traffic volume and it is closely related to traffic accidents. Therefore, an analysis on the causes of traffic accidents is judged to be an essential factor to establish the measure to reduce traffic accidents. In this regard, the analysis was conducted on the clustering by using the nearest neighbor indexes with regard to the occurrence frequencies of commercial and residential zone based on traffic accident data of the past five years (2009-2013) with the target of local small-medium sized city, Jinju-si. The analysis results, obtained in this study, are as follows: the occurrence frequency of traffic accidents was the highest in spring and the lowest in winter respectively. The clustering of traffic accident occurrence at nighttime was stronger than at daytime. In addition, terms of the analysis on the clustering of traffic accident according to land use, changes according to the seasons was not significant in commercial areas, while clustering density in winter tended to become significantly lower in residential areas. The analysis results of traffic accident types showed that the side-right angle collision of cars was the highest in frequency occurrence, and widespread in both commercial areas and residential areas. These results can provide us with important information to identify the occurrence pattern of traffic accidents in the structure of urban space, and it is expected that they will be appropriately utilized to establish measures to reduce traffic accidents.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.16 no.1
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• pp.50-59
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• 2023

The purpose of this study was to analyze the patients hospitalized with damage by injury code based on data for two years in 2020 and 2021 of A institution located in Gangneung, Gangwon-do. Analyzed the injury codes with a large number of occurrences per year, and analyzed the injury codes of external causes accordingly. The cause of the injury code was analyzed by analyzing the frequency of the injury code of external causes. Injury code S0650 had the highest frequency of injury code of external causes W189 and X5999, which was judged to be the cause of traumatic subdural hemorrhage without open intracranial wounds when falling in an unspecified place or toilet. Injury code S72120 had the highest frequency of injury code of external causes W010 and W180, and it was judged to be the cause of obstructive femoral intertrochanteric fracture that occurs when falling in the residence. The injury code S32090 had a high frequency of X5999, and it was analyzed that it caused the obstructive fracture of the lumbar region due to an accident caused by exposure in an unspecified place, and the injury code S72.090 had a high frequency of W010 and W180. It was confirmed that the cause of the obstructive fracture of the femoral neck was mainly caused by slipping or slipping in the residence, and the injury code S0220 had a high frequency of the injury code of external causes Y049, and it was confirmed that the fibula was fractured mainly by the force or fist. As such, the cause of the injury code was analyzed by analyzing the frequency of the injury code for each injury code of external causes.

• Journal of the Korean Society of Hazard Mitigation
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• v.9 no.6
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• pp.31-39
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• 2009

This study has found that there is a reverse phase with interdecadal variation in temporal variations of tropical cyclone (TC) genesis frequency (TCGF) between Northwest sector and Southeast sector, based on climatological mean tropical cyclone genesis location over the western North Pacific. The TCGF in the Northwest sector has been increased since the mid 1980s (1986-2005), while TCGF in the Southeast sector was higher until the early 1970s (1951-1970). The analysis of a difference between 1986-2005 and 1951-1970 showed results as follows: i) Through the analysis of vertical wind shear (VWS) and sea surface temperature (SST), less VWS and higher SST in the former (latter) period was located in the Northwest (Southeast) sector. ii) In the analysis of TC passage frequency (TCPF), TCs occurred in the Northwest sector frequently passed from east sea of the Philippines, through East China Sea, to Korea and Japan in the latter period, while TCs in the former period frequently has a lot of influences on South China Sea (SCS). In the case of TCs occurred in the Southeast sector, TCs in the west (east), based on $150^{\circ}E$ had a high passage frequency in the latter (former) period. In particular, TCs during the latter period frequently moved toward from the east sea of the Philippines to SCS and southern China. iii) This difference of TCPF between the two periods was characterized by 500 hPa anomalous pressure pattern. Particularly, anomalous cyclonic circulation strengthened over the East Asian continent caused anomalous southerlies along the East Asian coast line from the east sea of the Philippines to be predominate. These anomalous winds served as steering flows that TC can easily move toward same regions.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.599-603
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• 2012

본 연구에서는 부정류 계산 모형을 이용한 확률 홍수량 및 홍수위 산정 방법을 개발하고, 이를 한강 살리기 사업이 진행 중인 남한강 구간에 적용하였다. 우선 한강 살리기 사업 전과 후의 하도에 대하여 부정류 계산 모형을 각각 수립하였으며, 과거 발생한 홍수사상을 조사하였다. 사업 전 모형과 최근에 발생한 홍수사상을 이용하여 모형의 보정 및 검증을 실시하고, 추정된 매개변수를 사업 후의 하도에 대한 모형에 적용하였다. 대상 유역에 과거 발생한 홍수사상을 사업 후 모형으로 모의하여 각 홍수사상 별로 최대 홍수량 및 홍수위를 계산하였다. 이때 최대 홍수량 모의 결과들을 빈도해석 대상 자료군으로 사용하여, 연최대치 계열이나 부분 시계열에 대하여 빈도해석을 통하여 확률 홍수량을 산정할 수 있다. 본 연구에서는 장기간의 관측자료의 확보가 어려운 국내의 현실을 고려하여, 부분 시계열의 빈도해석 방법을 사용하여 확률 홍수량을 산정하였다. 다음으로 부정류 계산모형의 모의 결과인 최대 홍수량 및 홍수위 자료를 회귀분석하여 수위-유량 관계식을 유도하고, 각 빈도별 확률 홍수량을 관계식에 대입하여 확률 홍수량에 대응하는 확률 홍수위를 산정하였다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.45-48
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• 2007

한반도에 발생한 폭염을 전반적으로 잘 나타내고 있는지에 대하여 제안된 한국형 폭염특보기준과 현재 기상청에서 사용하고 있는 열지수(Heat Index, HI)를 비교${\cdot}$검토한 결과, 같은 조건인 Case 1 기준과 Case 3 기준을 비교한 결과, Case 1 기준이 Case 3 기준에 비해서 거의 절반 수준의 초과 발생 빈도 범위를 나타내고 있음을 알 수 있다. 발생지점의 위치에는 거의 차이를 보이고 있진 않지만 발생빈도수에서는 두 배 가량의 큰 차이를 보이고 있으므로, 추후 14년 동안의 지점별 초과사망자의 빈도수와 그에 따른 연구가 더 필요하다.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.1027-1031
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• 2004

2001년에 발생한 가뭄 심도를 기왕의 주요 가뭄과 비교평가하기 위하여 전국을 95개 소유역으로 구분하고 월 강우량 계열로부터 작성된 갈수우량계열을 이용하여 지역빈도해석을 실시하였다. L-모멘트법을 사용하여 강우지속기간별, 재현기간별 갈수우량을 산정하고 지속기간별 확률갈수우량도를 작성하였다. 또한, 연평균강우량과 가뭄의 발생지역을 비교하여 강우량이 적은 지역과 가뭄이 자주 발생하는 지역의 연관성을 검토하였다. 강우지속기간-재현기간-갈수우량 관계를 고려하여 2001년 가뭄의 심도와 지역적 범위를 최근에 발생한 '95 가뭄과 비교 평가하였다. 본 연구를 통하여 2001년 가뭄의 특성과 용수공급을 위한 적정 방안을 제안하였다.

• Journal of the Korean earth science society
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• v.27 no.6
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• pp.653-658
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• 2006

The seasonal predictability of typhoon activity over the western North Pacific is investigated using an atmospheric general circulation model GCPS. A ten-member ensemble with different initial conditions is integrated for five months using observed sea surface temperature data for each year from 1979 to 2003. It is shown that the monthly variation of occurrence frequency of simulated tropical storms and the distribution of tropical storm genesis location are similar to those of observed tropical storms, but the model is unable to reliably predict the interannual variation of the occurrence frequency of tropical storms. This is largely because the observed relationship between tropical storm occurrence frequency and ENSO is different from the simulated one. Unlike the observation, in which the tropical storm occurrence frequency has no relation to ENSO, the model has a tendency to generate more (less) tropical storms than normal during El Nino (La Nina). On the other hand, the interannual variation of the mean longitude of tropical storms that shows a close connection with ENSO in both observations and simulations is simulated similar to the observation.