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763篇 您的检索式:作者名="Steger"
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1National-scale data-driven rainfall induced landslide susceptibility mapping for China by accounting for incomplete landslide data显示文摘China is one of the countries where landslides caused the most fatalities in the last decades. The threat that landslide disasters pose to people might even be greater in the future, due to climate change and the increasing urbanization of mountainous areas. A reliable national-scale rainfall induced landslide susceptibility model is therefore of great relevance in order to identify regions more and less prone to landsliding as well as to develop suitable risk mitigating strategies. However, relying on imperfect landslide data is inevitable when modelling landslide susceptibility for such a large research area. The purpose of this study is to investigate the influence of incomplete landslide data on national scale statistical landslide susceptibility modeling for China. In this context, it is aimed to explore the benefit of mixed effects modelling to counterbalance associated bias propagations. Six influencing factors including lithology, slope,soil moisture index, mean annual precipitation, land use and geological environment regions were selected based on an initial exploratory data analysis. Three sets of influencing variables were designed to represent different solutions to deal with spatially incomplete landslide information: Set 1(disregards the presence of incomplete landslide information), Set 2(excludes factors related to the incompleteness of landslide data), Set 3(accounts for factors related to the incompleteness via random effects). The variable sets were then introduced in a generalized additive model(GAM: Set 1 and Set 2) and a generalized additive mixed effect model(GAMM: Set 3) to establish three national-scale statistical landslide susceptibility models: models 1, 2 and 3. The models were evaluated using the area under the receiver operating characteristics curve(AUROC) given by spatially explicit and non-spatial cross-validation. The spatial prediction pattern produced by the models were also investigated. The results show that the landslide inventory incompleteness had a substantial impact on the outcomes of the statistical landslide susceptibility models. The cross-validation results provided evidence that the three established models performed well to predict model-independent landslide information with median AUROCs ranging from 0.8 to 0.9.However, although Model 1 reached the highest AUROCs within non-spatial cross-validation(median of 0.9), it was not associated with the most plausible representation of landslide susceptibility. The Model 1 modelling results were inconsistent with geomorphological process knowledge and reflected a large extent the underlying data bias. The Model 2 susceptibility maps provided a less biased picture of landslide susceptibility. However, a lower predicted likelihood of landslide occurrence still existed in areas known to be underrepresented in terms of landslide data(e.g., the Kuenlun Mountains in the northern Tibetan Plateau). The non-linear mixed-effects model(Model 3) reduced the impact of these biases best by introducing bias-describing variables as random effects. Among the three models, Model 3 was selected as the best national-scale susceptibility model for China as it produced the most plausible portray of rainfall induced landslide susceptibility and the highest spatially explicit predictive performance(median AUROC of spatial cross validation 0.84) compared to the other two models(median AUROCs of 0.81 and 0.79, respectively). We conclude that ignoring landslide inventory-based incompleteness can entail misleading modelling results and that the application of non-linear mixed-effect models can reduce the propagation of such biases into the final results for very large areas.Qigen Lin Pedro Lima Stefan Steger Thomas Glade Tong Jiang Jiahui Zhang Tianxue Liu Ying Wang 2021Geoscience Frontiers2021,12,6:4
2从中欧博士生培养模式比较探索创新型博士的培养显示文摘创新能力是博士生培养的核心内容和重要任务,与西方发达国家相比,我国博士生创新能力培养目前还存在一些缺憾。本文通过实地考察和文献调研,深入剖析欧洲博士生培养模式,并从选拔方式、课程设置、导师指导和考核评价四个方面对中欧博士生的培养模式进行分析比较,提出构建我国创新型博士培养模式的对策建议。成花林 黄雨 Elmar Schmaltz Stefan Steger 2017研究生教育研究2017,,1:3
3An Unbiased Detector of Curvilinear Structures 显示文摘Steger C 1998IEEE Transactions on Pattern Analysis and Machine Intelligence1998,20,2:2
4Literature review and bibliometric analysis on data-driven assessment of landslide susceptibility显示文摘In recent decades, data-driven landslide susceptibility models(Dd LSM), which are based on statistical or machine learning approaches, have become popular to estimate the relative spatial probability of landslide occurrence. The available literature is composed of a wealth of published studies and that has identified a large variety of challenges and innovations in this field. This review presents a comprehensive up-to-date overview focusing on the topic of Dd LSM. This research begins with an introduction of the theoretical aspects of Dd LSM research and is followed by an in-depth bibliometric analysis of 2585 publications. This analysis is based on the Web of Science, Clarivate Analytics database and provides insights into the transient characteristics and research trends within published spatial landslide assessments. Following the bibliometric analysis, a more detailed review of the most recent publications from 1985 to 2020 is given. A variety of different criteria are explored in detail, including research design, study area extent,inventory characteristics, classification algorithms, predictors utilized, and validation technique performed. This section, dealing with a quantitativeoriented review expands the time-frame of the review publication done by Reichenbach et al. in 2018 by also accounting for the four years, 2017-2020. The originality of this research is acknowledged by combining together:(a) a recap of important theoretical aspects of Dd LSM;(b) a bibliometric analysis on the topic;(c) a quantitative-oriented review of relevant publications;and(d) a systematic summary of the findings, indicating important aspects and potential developments related to the Dd LSM research topic. The results show that Dd LSM are used within a wide range of applications with study area extents ranging from a few kilometers to national and even continental scales. In more than 70% of publications, a combination of the predictors, slope angle, aspect and geology are used. Simple classifiers, such as, logistic regression or approaches based on frequency ratio are still popular, despite the upcoming trend of applying machine learning algorithms. When analyzing validation techniques, 38% of the publications were not clear about the validation method used. Within the studies that included validation techniques, the AUROC was the most popular validation metric, being used accounting for 44% of the studies. Finally, it can be concluded that the application of new classification techniques is often cited as a main research scope, even though the most relevant innovation could also lie in tackling data-quality issues and research designs adaptations to fit the input data particularities in order to improve prediction quality.Pedro LIMA Stefan STEGER Thomas GLADE Franny G.MURILLO-GARCIA 2022Journal of Mountain Science2022,19,6:2
5Comparison of ART outcomes in men with altered mRNA protamine 1/protamine 2 ratio undergoing intracytoplasmic sperm injection with ejaculated and testicular spermatozoa显示文摘Assisted reproductive technologies invoIving the use of spermatozoa and eggs for in vitro fertilization(IVF)have come as the solution for many infertile couples to become parents.However,in some cases,the use of ejaculated spermatozoa delivers poor IVF performance.Some studies have suggested the use of testicular spermatozoa in severe male in fertility cases,but no guideli nes regarding their utilization are currently available.In the present study,we found the mRNA protamine 1/protamine 2(P1/P2)ratio to be a valuable biomarker of poor sperm function that could be used as a diagnostic key for the identification of cases that would benefit from the use of testicular spermatozoa.A total of 23 couples undergoing egg donation cycles with at least one previous cycle failure were studied.All couples underwent two consecutive intracytoplasmic sperm injection(ICSI)cycles with either ejaculated or testicular spermatozoa(TESA).The sperm mRNA P1/P2 ratio,fertilization rate,blastocyst rate,and pregnancy and live birth rate were compared.Results showed improved ICSI and clinical outcomes in cycles with testicular spermatozoa in men with altered mRNA P1/P2 ratios.TESA cycles presented significantly higher rates of fertilization(mean±standard deviation:76.1%±15.1%vs 65.5%±18.8%),blastocyst formation(55.0%±20.3%vs 30.8%±23.8%),and good morphological quality blastocyst(28.9%±22.9%vs 13.5%±17.9%)and also improvements on pregnancy(60.9%vs 0%)and healthy birth rates(56.5%vs 0%)than EJACULATE cycles.The results described here suggest that in patients with previous IVF/ICSI failures and aberrant mRNA protamine ratios,the use of testicular spermatozoa may be a good alternative to improve clinical outcomes.Jonas Sarasa Maria Enciso Laura Garcia Andrea Leza Klaus Steger Jon Aizpurua 2020Asian Journal of Andrology2020,22,6:2
6The impact of autophagy in spermiogenesis显示文摘Nihan Ozturk Klaus Steger Undraga Schagdarsurengin 2017Asian Journal of Andrology2017,19,6:2
7Incidince and impact of systemic venous collateral development after Glenn and Fontan procedures显示文摘Heinemann M Breuer J Steger V 2001Thorac Cardiovasc Surg2001,49,3:2
8Epidemiology of nosocomial pneumonia: new perspectives on an old disease显示文摘Craven DE Steger KA 1995Chest1995,,:1
9It Is Necessary to Use Processing Promoters in Tyre Compounds显示文摘Steger L 1990Kautchuck Gummi Kunststoffe1990,43,3:1
10PP AR gamma and C/EBP factors orchestrate adipocyte biology via adjacent binding on a genome-wide scale显示文摘Lefterova MI Zhang Y Steger DJ 2008Genes2008,22,21:1
11Histologic Pathologies of the Myocardium in Septic Shock: A Prospective Observational Study显示文摘Christian A. Schmittinger Martin W. Dünser Christian Torgersen Günter Luckner Ingo Lorenz Stefan Schmid Michael Joannidis Patrizia Moser Walter R. Hasibeder Milo Halabi Christina M. Steger 2013Shock2013,,4:1
12Gene expression profiling identifies new biological markers of neoplastic germ cells 显示文摘Biermann K Heukamp L C Steger K 2007Anticancer Res2007,27,5:1
13Phenotypically distinct subpopulations of T cells in domes and M cell pockets of rabbit gut-associated lymphoid tissues显示文摘Ermak TH Steger HJ Pappo J 1990Immunology1990,71,4:1
14The proliferation of spermato gonia in normal and pathological human seminiferous epithelium:an immunohistochemical study using monoclonal antibodies against Ki-67 protein and proliferating cell nuclear antigen显示文摘Steger K Aleithe I Behre H 1998Mol Hum Reprod1998,4,3:1
15Endocardial fibroelastosis of the heart显示文摘Steger C M Antretter H Moser P L 2012Lancet2012,10,7:1
16The Berkeley lower extremity exoskeleton显示文摘KAZEROONI H STEGER R 0,,03:1
17Testing the Value of Customization:When Do Customers Really Prefer Products Tailored to Their Preferences?显示文摘Franke N Keinz P Steger C J 2009Journal of Marketing2009,73,5:1
18Control and system identification for the Berkeley Lower Extremity Exoskeleton (BLEEX) 显示文摘GHAN J STEGER R KAZEROONI H 2006Advanced Robotics2006,20,9:1
19Thanks? Grati-tude and well - being over the Thanksgiving holiday amongcollege students 显示文摘ALLAN B A STEGER M F SHIN J Y 2013The Journal of Positive Psychology2013,8,2:1
20Incompleteness of Sparse Coherent States显示文摘Jayakumar Ramanathan Tim Steger 1995Applied and Computational Harmonic Analysis1995,,2:1
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