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A Comparative Analysis of Binary Logistic Regression and Analytical Hierarchy Process for Landslide Susceptibility Assessment in the Dobrovǎt River Basin,Romania

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Pedosphere 2016年第3期26卷 335-350页

作者： Cristian V.PATRICHE Radu PIRNAU adrian grozavu Bogdan ROSCA Romanian Academy Department of IasiGeography Group "Alexandru Ioan Cuza" University of Iasi Faculty of Geography

A correct assessment of the landslide susceptibility component is extremely useful for the diminution of associated potential risks to local economic development, particularly in regard to land use planning and soil conservation. The purpose of the present study was to compare the usefulness of two methods, i.e., binary logistic regression(BLR) and analytical hierarchy process(AHP), for the assessment of landslide susceptibility over a 130-km^2 area in the Moldavian Plateau(eastern Romania) region, where landslides affect large areas and render them unsuitable for agriculture. A large scale inventory mapping of all types of landslides(covering 13.7% of the total area) was performed using orthophoto images, topographical maps, and field surveys. A geographic information system database was created, comprising the nine potential factors considered as most relevant for the landsliding process. Five factors(altitude, slope angle, slope aspect, surface lithology, and land use) were further selected for analysis through the application of a tolerance test and the stepwise filtering procedure of BLR. For each predictor, a corresponding raster layer was built and a dense grid of equally spaced points was generated, with an approximately equal number of points inside and outside the landslide area, in order to extract the values of the predictors from raster layers. Approximately half of the total number of points was used for model computation, while the other half was used for validation. Analytical hierarchy process was employed to derive factor weights, with several pair-wise comparison matrices being tested for this purpose. The class weights, on a scale of 0 to 1, were taken as normalized landslide densities. A comparison of results achieved through these two approaches showed that BLR was better suited for mapping landslide susceptibility, with 82.8% of the landslide area falling into the high and very high susceptibility classes. The susceptibility class separation using standard deviation was superior to either t

关键词： Logistic回归分析敏感性评价山体滑坡层次分析法罗马尼亚河流域土地利用规划地方经济发展

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Comparative Study of Three Phase 3-Leg Active Power Filters Connected to 4-Wire Electrical Systems

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Journal of Energy and Power Engineering 2012年第9期6卷 1527-1535页

作者： Ciprian Balanuta Gelu Gurguiatu Toader Munteanu Grigore Fetecau Olimpia grozavu Department of A utomatic Control and Electrical Engineering Faculty of Automatic Control Computers Electrical and ElectronicsEngineering "Dun(trea de los" University Gala l~" 800008 Romania

This paper presented the simulation results of the three phase electrical systems supplied by four wires with power quality problems, to which the parallel 3-leg APF (active power filters) are connected. The purpose of this study is to analyze the results obtained in these conditions in order to observe the limits of the 3-leg active power filters and to form a foundation for the future studies of the 4-leg active power filters. For a complete analysis, the APF will be controlled by four control methods: synchronous reference system control, indirect control, instantaneous p-q theory control, and positive sequence control. The analysis will watch the power quality indicators: THD (total harmonic distortion factor), PF (power factor), Iunb (unbalance factor).

关键词：有源电力滤波器三相电力系统电气系统连接控制方式 APF 质量问题参考系统

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