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Error Forecasting Using Linear Regression Model
Ler, Lian Guey,Kim, Byung-Sik,Choi, Gye-Woon,Kang, Byung-Hwa,Kwang, Jung-Jae Korean Wetlands Society 2011 한국습지학회지 Vol.13 No.1
In this study, Mike11 will be used as the numerical model where a data assimilation method will be applied to it. This paper aims to gain an insight and understanding of data assimilation in flood forecasting models. It will start with a general discussion of data assimilation, followed by a description of the methodology and discussion of the statistical error forecast model used, which in this case is the linear regression. This error forecast model is applied to the water level forecast simulated by MIKE11 to produced improved forecast and validated against real measurements. It is found that there exists a phase error in the improved forecasts. Hence, 2 general formula are used to account for this phase error and they have shown improvement to the accuracy of the forecasts, where one improved the immediate forecast of up to 5 hours while the other improved the estimation of the peak discharge.
역행렬 알고리즘을 이용한 다파장 라만 라이다 데이터의 고도별 에어로졸 Microphysical Parameter 도출
노영민,김영준,Detlef M?ler 한국대기환경학회 2007 한국대기환경학회지 Vol.23 No.1
Vertical distribution and optical properties of atmospheric aerosols above the Korean peninsula are quite impor-tant to estimate effects of aerosol on atmospheric environment and regional radiative forcing. For the st time inKorea, vertical microphysical properties of atmospheric aerosol obtained by inversion algorithm were analyzedbased on optical data of multi-wavelength Raman lidar system developed by the Advanced Environmental Moni-toring Research Center(ADEMRC), Gwangju Institute Science and Technology(GIST). Data collected on 14 June2004 at Gwangju(35.10N, 126.53E) and 27 May 2005 at Anmyeon island(36.32N, 126.19E) were used as rawoptical data for inversion algorithm. Siberian forest e smoke and local originated haze were observed above andwithin the height of PBL, respectively on 14 June 2004 according to NOAA/Hysplit backstrajectory analysis. Theinversion of lidar optical data resulted in particle effective radii around 0.31~ 0.33m, single scattering albedobetween 0.964~ 0.977 at 532nm in PBL and effective radii of 0.27m and single scattering albedo between 0.923~ 0.924 above PBL. In the case on 27 May 2005, biomass burning from east China was a main source of aerosolplume. The inversion results of the data on 27 May 2005 were found to be particle effective radii between 0.23~0.24m, single scattering albedo around 0.924~ 0.929 at 532 nm. Additionally, the inversion values were wellmatched with those of Sun/sky radiometer in measurement period.
( Soon Yaw Walter Wong ),( Fen Li Stephanie Ler ),( Rehena Sultana ),( Hamid Rahmatullah Bin Abd Razak ) 대한슬관절학회 2022 대한슬관절학회지 Vol.34 No.-
Purpose: Asians have a low venous thromboembolism (VTE) incidence following total knee arthroplasty (TKA). This systematic review and network meta-analysis was conducted to evaluate the best prophylaxis against VTE in Asians following total knee arthroplasty in current literature. Materials and Methods: A systematic search of PubMed, Embase and CINAHL was conducted in adherence with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). Prophylaxis types were separated into low-molecular-weight heparin (LMWH), novel oral anti-coagulants (NOAC), mechanical-only prophylaxis (MOP) and no prophylaxis (NP). The primary outcome was VTE incidence, grouped according to diagnosis modality (ultrasound, venography, clinical). The secondary outcome was bleeding incidence, grouped into minor and major bleeding. Results: Fourteen eligible articles, totalling 4259 patients, were pooled with the following significant results: NOACs had lower venography-diagnosed VTE incidence than LMWH (12.77%, p = 0.02) and NP (20.64, p < 0.001). MOP had lower venography-diagnosed VTE incidence than LMWH (23.72%, p < 0.001), NOACs (10.95%, p < 0.001) and NP (31.59%, p < 0.001) but, interestingly, a statistically higher ultrasound-diagnosed VTE incidence than LMWH (6.56%, p = 0.024) and NP (4.88%, p = 0.026). No significant differences were observed between prophylaxis types for symptomatic VTE, pulmonary embolism (PE) or death. LMWH and NOACs had a higher minor bleeding incidence than NP (11.71%, p < 0.001 and 6.33%, p < 0.02, respectively). No significant differences were observed between prophylaxis types for major bleeding incidence. Conclusion: NOACs are a superior form of chemoprophylaxis, compared with LMWH, in reducing venographydiagnosed VTE incidence with no added bleeding incidence. However, routine chemoprophylaxis may not be required as LMWH and NOACs do not appear to reduce symptomatic VTE incidence compared with MOP and NP with an increased minor bleeding incidence. Mechanical prophylaxis in the form of graduated compression stockings or intermittent pneumatic compression should be routinely considered with significantly lower rates of venography-diagnosed VTE compared with NP. On the basis of current evidence, we recommend an individualised approach to select the most appropriate prophylaxis type.