Impact of Hyperparameter Optimization on Cross-Version Defect Prediction: An Empirical Study [PDF]
, 2023 In the field of machine learning, hyperparameters are one of the key factors that affect prediction performance. Previous studies have shown that optimizing hyperparameters can improve the performance of inner-version defect prediction and cross-project ...
HAN Hui, YU Qiao, ZHU Yi
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Wind Power, Hydropower and Thermal Power Combined Low-Carbon Maintenance Optimization Based on Continuous Hidden Markov Model [PDF]
, 2023 [Introduction] In the context of the new power system, low-carbon maintenance of wind turbines and coordinated maintenance with conventional wind turbine generator systems (WTGS) need to be solved urgently.
Min XIE +4 more
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Free-Reference EPI Distortion Correction and Spiral MRI Reconstruction under Strong Inhomogeneous Field based on Compressed Sensing and Parallel Computing [PDF]
, 2016 平面回波成像序列（EPI）和螺旋采样成像（SpiralMRI）序列是磁共振成像中典型的快速序列，在功能性成像，动态实时成像等领域具有重要价值。但是快速序列对不均匀场敏感，不均匀场的影响在EPI图像中表现为形状扭曲和亮度失真，在SpiralMRI中表现为模糊伪影。 对于EPI图像的不均匀场矫正，目前的大部分矫正方法或是需要额外的采样来获得场图，或是无法解决强不均匀场下的扭曲失真问题。本文提出一种迭代的矫正算法，它不需要为了获取不均匀场图而额外地采样，并且能够适用于解决局部不均匀场问题 ...
庄孝星
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Integrative Conservation, EarlyView.Our research allows us to understand the predictors of extinction risk in traditional Chinese medicinal (TCM) plant species with known threat status, and incorporate this knowledge to predict other TCM plants with unknown conservation status in China so as to improve the overall effectiveness of conservation strategies.
Yuhan Zheng +4 more
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The Term Configuration Management of China's Foreign Exchange Reserves Based on Dynamic Stochastic Optimization Model of CVaR and Moment Matching [PDF]
, 2016 外汇储备，是指一国货币当局为平衡国际收支、维持本国货币汇率稳定以及应付紧急需要而持有的在国际间可以被普遍接受的可自由兑换资产。自1994年我国外汇体制改革至今，因为保持多年的贸易顺差，整体储备规模由1994年的516.20亿美元增长到2015年的3.33万亿美元。快速增长的我国外汇储备呈现出以下三个特点：第一，储备规模巨大，在2014年曾达到3.84万亿美元；第二，币种结构单一，以美元为主，美元占比达到60%-70%；第三，资产类别较为集中，主要以美国长期国债为主 ...
康勰斐
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Multi-objective Topology Optimization and Design for Industrial Robot [PDF]
, 2017 为了综合提高工业机器人的结构刚度、振动频率,降低结构质量,从而提高机器人整体的静动态性能,提出了一种基于多目标拓扑优化的机器人结构优化方法.该方法首先对机器人整机和部件进行分析,寻找机器人薄弱的零部件;然后对其进行多目标拓扑优化和模型重建,从而获得最佳的结构.将该方法成功应用于一款3kg装配、搬运等多功能机器 人的分析优化中,结果验证了该分析优化方法的可用性和有效性.In order to comprehensively improve the structure of industrial ...
褚旭阳, 许辉煌
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Wildlife Letters, EarlyView.Climate change drives shifts in suitable habitats for Eurasian lynx and its prey (hare, roe deer) in Mohe, Daxing'anling Mountains. Under RCP scenarios, moderate warming (RCP4.5) promotes substantial habitat expansion, while high‐emission conditions (RCP8.5) lead to strong expansion in the 2050s but slower gains and partial contraction by the 2070s ...
Binglian Liu +5 more
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Gaoya dianqi, 2021 移动储能技术作为一种新型的灵活性资源,其在电力系统的防灾与应急支援等多种场景中发挥了非常重要作用。在此背景下,提出了基于模糊机会约束规划的储能应急车优化调度模型,以最大程度地恢复重要电力用户的供电并减少停电损失。首先,介绍了储能应急车的工作原理,提出了考虑负荷分级和行驶时间不确定性的储能应急车优化调度的模糊机会约束规划模型,该模型以最小化总停电损失为优化目标,实现对一级负荷的持续供电。然后,针对行驶时间的不确定性,采用模糊理论中的模糊参数表示行驶时间 ...
肖凯超 +5 more
doaj
Experimental Measurement of Interdiffusivities and Calculation of Diffusion Kinetics in Some bcc Ti-based Alloys Systems [PDF]
, 2016 钛合金具有比强度高、耐蚀性好、耐热性好及良好的生物相容性等特点，在航空、航天、冶金、汽车及医用等领域得到了广泛的应用。由于钛合金的许多热处理工艺和相变均与合金元素的扩散行为密切相关，因此，有必要对材料的扩散动力学进行实验分析和理论计算。然而，目前由于缺乏相关的扩散实验数据，钛基合金动力学数据库还很不完善。因此，本研究通过扩散偶法，实验测定了部分钛基二元系中bcc相的互扩散系数，并基于文献报道的扩散实验信息和本研究得到的实验数据，利用DICTRA软件进行动力学参数的优化与计算。同时，基于文献报道的实验信息，
罗奕胜
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Study on utility optimization for randomized response mechanism [PDF]
, 2019 For the study of privacy-utility trade-off in local differential privacy,the utility optimization models of binary generalized random response mechanism for the case of differential privacy and approximate differential privacy were established.By graphic
Laifeng LU, Yihui ZHOU, Zhenqiang WU
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