Results 21 to 30 of about 936 (140)
Shuitu Baochi Xuebao, 2022 以2000—2020年MODIS-NDVI植被指数为数据源,反演计算黄土高原植被覆盖度,通过转移矩阵和重心迁移等方法分析黄土高原植被覆盖度时空格局变化及其与降水、气温、坡度和土壤类型等因素的关系。结果表明:(1)2000—2020年黄土高原植被覆盖度由0.39提高到0.61,整体呈上升趋势,2017年后实现快速提升;(2)近20年,黄土高原植被覆盖度显著好转类型与极显著好转类型改善面积比例达到37.93%,2009年前以低覆盖和中低覆盖植被为主,2010年后以中覆盖及更高等级覆盖植被为主 ...
王逸男 +4 more
doaj +2 more sources
Indoor EKF localization algorithm based on RFID carrier phase [PDF]
, 2022 In order to solve the problem of low localization accuracy caused by indoor environment interference in the existing UHF RFID localization methods, an indoor extended Kalman filter (EKF) localization algorithm based on frequency hopping assisted RFID ...
Liangbo XIE +4 more
core +1 more source
Multiview Spectral Clustering Based on Weighted Tensor Low-Rank Constraint [PDF]
Many existing multiview clustering methods fail to simultaneously exploit the high-order correlations embedded in different views and the global geometric structure of each single view, resulting in inadequate clustering performance.
Sihui LIU, Quanxue GAO, Wei SONG, Deyan XIE
core +1 more source
Rating migration matrix of Chinese enterprises debt based on Markov processes [PDF]
, 2011 评估和管理信用风险，无论是贷款，债券还是衍生证券等，已经成为金融机构的一个主要问题。信用转移矩阵反应了在过去某一段时间内信用状态变化的总和。在外国，信用风险转移有了较多的研究与发展，相对而言，国内的信用评级相对较少，对信用等级转移的相关数据处理和实证研究等也是较为少见。 本文主要做的是基于Markov过程的信用风险转移矩阵的构建。在整编文章中，本文试着给信用风险转移矩阵的构建做了大概的框架。文章从现在著名评级公司公布的转移概率计算方法开始，借鉴引入了基于Markov过程的信用风险转移的构建 ...
黄学共
core
A Novel Method for Tracking Complex Maneuvering Star Convex Extended Targets Using Transformer Network [PDF]
To address the challenges in tracking complex maneuvering extended targets, an effective maneuvering extended target tracking method was proposed for irregularly shaped star-convex using a Transformer network.
Binchao BIAN +3 more
core +1 more source
Integrative Conservation, Volume 4, Issue 1, Page 71-84, March 2025.Gaoligong Mountain is home to a large number of rare and endangered species, but the effectiveness of conservation measures in the Gaoligong Mountain Nature Reserve remains uncertain. We predicted the potential distribution areas of 361 rare and endangered wild plants in southern Gaoligong Mountain under current and future climate change scenarios and ...
Yong‐Jing‐Wen Yang +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2002 利用1988年,2000年的遥感图像数据,求得吉林省松原市沙区土地利用变化的转移矩阵,根据计算结果,分析探讨了松原市沙区监测期间土地利用变化特征及区域差异。结果表明:松原市沙区土地利用变化显著,耕地、林地大幅度增加,草地与未利用地减少且空间差异明显,土地利用变化的主要驱动力是人口增长和土地收益高低。在此基础上探讨了土地利用变化方向对该区土地沙化演化的影响,研究表明:耕地向草地和林地的转移有利于沙化的逆转,林地向草地和耕地转移会使沙化进一步发展。
崔海山 刘湘南 等
doaj +2 more sources
Multi-scenario Simulation on Carbon Storage of Green Space in Harbin City [PDF]
, 2023 [Objective] The carbon storage of the future green space patterns was predicted, and the impact of green space changes on carbon storage was analyzed in order to provide a basis for green space planning in Harbin City, Heilongjiang Province under the ...
Li Wen, Li Xue, Qu Chen, Shi Song
core +1 more source
A Improved Simple Algorithm to Compute Reachability Matrix with Adjacency Matrix [PDF]
, 2007 传统的由邻接矩阵求解可达矩阵的算法计算量很大,不适合手动计算,也没有提出相应的适合计算机的算法。这篇文章引入转移矩阵的概念,并在此基础上加以改进,形成一套完整的可行的求解可达矩阵的方法,有效地减少了计算量。Computing reachability matrix with traditional algorithm is a huge job. It's not adapted for hand calculation, neither for computer calculation.
张静, 李茂清
core
Resource allocation strategy based on deep reinforcement learning in 6G dense network [PDF]
, 2023 In order to realize no overlapping interference between cells, 6G dense network (DN) adopting resource allocation is the important technology of enhancing network performance.However, limited resources and dense distribution of nodes make it difficult to
Cheng YANG +6 more
core +1 more source