http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
엄장일,정관수 한국방재학회 2019 한국방재학회논문집 Vol.19 No.2
In order to determine the amount of dam discharge and the release schedule when a hydrological event such as flash flood occurs, a multiple linear regression analysis based on time series data was performed to estimate the inflow. The input variables used for the multiple linear regression analysis model were rainfall, discharge amount, and the preceding inflow amount during a period of 20 years (1998 ~ 2017) at the Seomjin River Dam. For the review of the time series data, a method to remove the random variation component of the inflow due to the limit of the existing inflow calculation method was proposed, and the inflow estimation method was compared and analyzed before and after the inflow estimation. The prediction of the inflow using the empirical model, namely the multiple linear regression analysis model, was good, and the prediction accuracy of the peak inflow was particularly good. 홍수와 같은 긴급한 수문사상 발생시 댐 방류 규모 및 방류 시점 결정 등 댐 운영의 핵심 자료인 유입량 예측을 위하여 시계열 자료 기반의 다중선형회귀분석을 시행하였다. 다중선형회귀분석모델에 사용된 입력변수로는 섬진강댐의 20년(1998∼2017) 시단위 강우량, 방류량 및 선행 유입량을 사용하였다. 특히 시계열 자료의 검토시 기존의 유입량 산정방법의 한계로 인한 유입량 산정시의 불규칙 변동 성분을 제거하는 방법을 제시하였으며, 유입량 예측시 보정전후 유입량을 비교 분석하여 유입량 재산정 방법의 적정성을 확인하였다. 경험적 모델인 다중선형회귀분석모델을 이용한 유입량 예측 결과 단기 유입량 예측의 정확성이 양호하였으며, 특히 첨두유입량 예측의 정확도가 우수하였다.
嚴章鎰 부산대학교 학생생활연구소 1965 硏究報 Vol.1 No.1
The above article is intended to attempt to help adjust the difficulties in the questions of mathematics by studyinrg them statistically which are presented of the entrence examination of our University and grasping the knowledge of mathematics that high school students have, particulary observing the influence of the guestions subjective and objective on the answers to them in forming most pertinent questions.
嚴章鎰,崔載玉 부산대학교 1978 論文集 Vol.26 No.2
It is the aim of the authors to introduce the conception of asymptotic expansion and develope some basic properties of asymptotics. At first in §1, we explain fundamental conception of asymptotic theory by expanding the improper integral ∞ Ih= ∫ x-2h eW2-X2 dx w Where w>o and h is a non negative integer. after some steps of integral by parts we arrive the asymptotic expansion (5), and this expansion gives the asymptotic behavior of the integral Ⅰ. Secondly we get recurrence formulae for two improper integrals. ∞ sin x In= ∫ ------- dx o (w+x)n and ∞ cos x In*= ∫------- dx o (w+x)n In §2 we define asymptotic equality and proved that the notion of asympototic equality is reflexive, symmetric and transitive. Finally we proved sum and difference theorem and product theorem.