Results 11 to 20 of about 65,518 (228)
Research on Beamforming and Sparse Array Based on Convex Optimization [PDF]
, 2016 基于阵列天线在无线电系统中各种应用，使阵列综合的研究十分重要。本文根据实际应用系统中的各种需求，结合凸优化的高效、快速以及局部最优解也是全局最优解的优点，研究了各种阵列综合问题及基于凸优化思想的解决方案。 首先，本文基于凸优化算法对理想点源以及考虑阵列天线辐射方向图的阵列的综合方法进行了全面的概述，包含了阵列的无目标优化、最小副瓣优化、最大方向性优化、最大效率优化以及最小阵元数目的优化。并且，针对每个优化目标给出了相应的仿真例子，用以验证相应的综合方法的有效性。 其次，本文提出了矢量场的阵列综合方法 ...
杨晶
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Integrative Conservation, EarlyView.Pometia pinnata demonstrated life‐stage‐specific genetic responses to landscape features, with asymmetric gene flow patterns and population recovery following historical bottlenecks, revealing complex topographic and demographic influences on forest genetic structure.
Madhuparna Chatterjee +5 more
wiley +1 more source
Evolutionary algorithms in dynamic environments [PDF]
, 2006 The file attached to this record is the author's final peer reviewed version.Evolutionary algorithms (EAs) are widely and often used for solving stationary optimization problems where the fitness landscape or objective function does not change during the
Wang, Dingwei +2 more
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Integrative Conservation, EarlyView.This study investigates distribution patterns of Galliforms in the Indian Himalayas, focusing on factors influencing their occurrence, regions of high diversity and endemism, and their overlap with protected areas. Our study highlights the need for assemblage‐level conservation strategies in high Himalaya which primarily relies on snow leopard‐focused ...
Manvi Sharma +5 more
wiley +1 more source
Research on Evolutionary Multi-objective Optimization Algorithms and their Applications [PDF]
, 2015 现实世界中的许多优化问题通常可以转化为多目标优化问题。所谓的多目标优化问题是指那些需要同时优化多个相互作用且相互冲突的目标函数的优化问题。目前，采用进化算法求解多目标优化问题已经成为了多目标优化领域中的研究热点。许多研究学者相继提出了一些进化多目标优化算法用于求解各种类型的多目标优化问题，一些优秀算法已经成功地应用在实际工程项目中。本文在全面介绍进化多目标优化算法的理论知识以及研究现状的基础上，主要针对不同特征的多目标优化问题设计出效果显著的求解策略。本论文的主要研究工作如下： （1 ...
陈碧黎
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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
wiley +1 more source
Research on Modified Interpolation and Solving of Topology Optimization Based on Variable Density Method [PDF]
, 2016 拓扑优化是在给定载荷、约束等条件下，寻找材料在设计域内最优布局的优化设计方法。在概念设计阶段具有重要意义，可以帮助设计者选择合适的初始拓扑结构。与传统设计方法相比，具有设计效率高，提高材料利用率等优点。从经济方面来看，拓扑优化可以减少设计成本、节约原材料，是结构设计中公认回馈最高的优化方式，已经成为结构设计中的研究热点，对其进行研究具有重要的理论意义及工程应用前景。 本文分析了国内外拓扑优化方法的研究现状，总结了拓扑优化有关理论、方法及应用方面的研究进展，在此基础上针对变密度法拓扑优化方法中SIMP ...
张昆鹏
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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
wiley +1 more source
Evaluating past and future contributions of conservation programs to species recovery
Conservation Biology, EarlyView.Abstract Impact evaluation of conservation actions is a crucial step in global efforts to curb the biodiversity crisis. Through robust impact evaluation, practitioners can assess the effectiveness of conservation strategies and optimize the use of limited resources.
Rebeca E. Young +10 more
wiley +1 more source
Design and Implementation of Adaptive Optimization System for Web Server Resources [PDF]
, 2015 经研究发现目前Web服务器面临的数据处理在不断的叠加，但是自身的资源优化存在较大的问题和漏洞，本文提出了Web服务器资源自适应优化机制，该机制首先对影响Web服务器性能的相关因素进行分析。在此基础上确定性能评价指标，对这些指标进行实时监控，并根据监控数据对Web服务器性能做出评价。最后依据评价结果对系统资源做自适应调整，从而实现在各种工作负载条件下，Web服务器资源自适应优化功能，保证Web服务器高性能运行。 基于前面的工作，建立了Web服务器资源优化模型，该模型实现了三大功能：一是运行状态监控管理功能；
胡奎
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