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R.J. LYTLE D.L. LAGER E.F. LAINE J.D. SALISBURY J.T. OKADA 《Geophysical Prospecting》1981,29(4):627-638
High-frequency electromagnetic probing is used to monitor the rate and direction of flow of fluids injected into the ground. This method shows the potential for providing more detailed information than procedures presently used. The experimental technique and the test-of-concept experimental results are discussed. This technique has applications in oil-reservoir engineering and in hydrology studies concerning storage of chemical wastes. 相似文献
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A ROBUST PLS PROCEDURE 总被引：1，自引：0，他引：1
A robust partial least squares(PLS)regression algorithm is developed.This is achieved by substitutionof the univariate regression steps in the iterative PLS2 algorithm by a robust alternative.The anglebetween loading vectors from both perturbed and unperturbed solutions is used as a measure ofrobustness.By means of a perturbation study on a structure-activity data set,it is demonstrated thatthe stability of the robust method is superior to standard PLS. 相似文献
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A TEST OF SIGNIFICANCE FOR PARTIAL LEAST SQUARES REGRESSION 总被引：1，自引：0，他引：1
IAN N. WAKELING JEFF J. MORRIS AFRC Institute of Food Research Earley Gate Whiteknights Ro Reading RG EF U.K.Zeneca Pharmaceuticals Mereside Alderley Park Macclesfiel Cheshire SK TG U.K. 《地理学报(英文版)》1993,(4)
Partial least squares (PLS) regression is a commonly used statistical technique for performingmultivariate calibration, especially in situations where there are more variables than samples. Choosingthe number of factors to include in a model is a decision that all users of PLS must make, but iscomplicated by the large number of empirical tests available. In most instances predictive ability is themost desired property of a PLS model and so interest has centred on making this choice based on aninternal validation process. A popular approach is the calculation of a cross-validated r~2 to gauge howmuch variance in the dependent variable can be explained from leave-one-out predictions. Using MonteCarlo simulations for different sizes of data set, the influence of chance effects on the cross-validationprocess is investigated. The results are presented as tables of critical values which are compared againstthe values of cross-validated r~2 obtained from the user's own data set. This gives a formal test forpredictive ability of a PLS model with a given number of dimensions. 相似文献
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Jussi P. LAINE 《地理科学进展》2017,36(12):1531-1539
随着社会的变化,相关研究的范式往往也会发生改变。本文对边界研究中概念的变化作出了解释。在边界仍然具有重要作用的今天,我们需要重新审视这些概念在不断变化的历史、政治和社会背景下体现出来的时空变化性和不确定性。本文强调了边界不仅是国家主权的分界线,还具有从地缘政治,到边界和跨边界的社会实践和文化生产的多层次复杂性。本文力求对边界研究中的相关争论作出建设性贡献,以促进对边界的过程化、去领域、分散性的本质,及其在全球化和跨国流动时期保证政权的作用的充分理解,展现边界研究作为一个跨学科的领域,仍具有自身内涵的学术地位。本文以边界景观的概念为核心组织元素,提倡在边界研究中采取相关的研究方法,从互补的视角考虑政治愿景与日常社会文化实践之间、社会表现和艺术想象之间的相互作用。 相似文献
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