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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Pandora Box Problem with Nonobligatory Inspection: Hardness and Approximation Scheme
潘多拉盒问题 非强制性检查 硬度 近似方案
2023/4/14
Weitzman (1979) introduced the Pandora Box problem as a model for sequential search with inspection costs, and gave an elegant index-based policy that attains provably optimal expected payoff. In vari...
When deep learning models are deployed in the real world, perhaps to detect financial fraud from credit card activity or identify cancer in medical images, they are often able to outperform humans.
地震波是探测地球内部结构的重要手段之一，基于走时数据的全球层析成像的结果已经获得了全球尺度的认识，其中最为显著的地震波速度结构是在非洲和太平洋板块下方的两个大尺度低速区。随着高性能计算机集群和并行算法的发展，复杂介质地震波谱元法数值模拟快速发展。新一代基于地震波波形的较高分辨率的全球波形层析成像得到了更加清晰、趋于统一的大尺度地幔结构（几百公里到千公里）。虽然更高分辨率（数公里到百公里）的小尺度结...
Unpacking black-box models（图）
黑盒模型 包装 数学框架 机器学习模型
2023/6/20
Modern machine-learning models, such as neural networks, are often referred to as “black boxes” because they are so complex that even the researchers who design them can’t fully understand how they ma...
Machine-learning algorithms are often referred to as a “black box.” Once data are put into an algorithm, it’s not always known exactly how the algorithm arrives at its prediction. This can be particul...
Box-Behnken法研究底水油藏直井底水锥进影响因素
底水锥进 数值模拟 Box-Behnken试验设计
2014/7/29
底水锥进是影响底水油藏开发效果的重要因素。用某实际油藏资料建立了底水油藏的数值模型，在综合考虑各种影响底水锥进的单因素基础上，设计底水锥进影响因素的无因次参数群，应用数值模拟计算的累积产油、产水和产液量回归俞启泰水驱特征曲线，以求得反映直井见水特征的参数b（水驱特征曲线斜率）。以参数b 为研究对象，运用Box-Behnken 试验设计，通过曲面反应法研究不同因素对b 值的影响，并得出各影响因素对底...
April 11, 2007，BATAVIA, Illinois-Scientists of the MiniBooNE1 experiment at the Department of Energy’s Fermilab2 today (April 11) announced their first findings. The MiniBooNE results resolve question...
13 December 2006，Regulation of protein stability through the ubiquitin proteasome system is a key mechanism underlying numerous cellular processes. The ubiquitin protein ligases (or E3) are in charge ...