Results 31 to 40 of about 65,518 (228)

Business Process Optimization for Relay Protection of State Grid Ningde Company [PDF]

open access: yes, 2016
电力行业是一个对社会经济影响极大,技术经济特征十分复杂的自然垄断产业。国家电网公司正面临电网规模不断扩大、智能电网技术快速发展、三集五大即人力、物力、财力集约化管理,大规划、大建设、大运行、大检修、大生产体系建设的体制改革等现状,而传统的管理方式已无法匹配国网公司的发展。本文以此为研究背景,以宁德供电公司为例,具体研究了大二次专业业务流程优化的相关问题。 首先,本文在对流程管理和流程优化理论进行认真分析的基础上,运用ECRSI分析法、标杆管理等相关理论,分析了宁德供电公司大二次专业业务流程现状 ...
郭茜婷
core  

Informing spatial conservation prioritization with species’ traits

open access: yesConservation Biology, EarlyView.
Abstract New Guinea, the most botanically diverse island on the planet, is the location for one of the boldest conservation initiatives. The Manokwari Declaration aims to achieve 70% conservation designation for the Bird's Head Peninsula. This is 40% higher than the 2022 Global Biodiversity Framework target.
Liam A. Trethowan   +27 more
wiley   +1 more source

全光网络波长数优化设计

open access: yesGuangtongxin yanjiu, 2000
在 WDM全光网的波长数优化设计中 ,本文采用最长路径优先的波长分配策略对 Naohide Nagatsu等人提出的 WP优化方案进行了改进。改进后的方案比原 WP优化方案更加简洁 ,并且仍然能够达到原 WP优化方案的优化效果。
夏俊, 吴志坚
doaj  

进化集成学习算法综述

open access: yes智能科学与技术学报, 2021
进化集成学习结合了集成学习和进化算法两方面的优势,并在机器学习、数据挖掘和模式识别等领域被广泛应用。首先对进化集成学习算法的理论基础、组成结构及分类情况进行了概述。然后根据进化算法在集成学习中的优化任务,从样本选择、特征选择、集成模型参数组合优化、集成模型结构优化以及集成模型融合策略优化几个方面对当前进化集成学习领域的一些代表性研究成果进行了详细的综述,并分析和总结了各种进化集成学习算法的特点。最后对现有的进化集成研究的优缺点进行探讨,并给出了未来的研究方向。
胡毅   +4 more
doaj  

Research on Energy Efficiency Optimization Algorithm for Copper Flash Smelting Process Based on Data-driven [PDF]

open access: yes, 2016
铜闪速熔炼工序具有多变量、非线性、大时滞、强耦合、生产波动大的特点,传统的基于机理模型的优化控制系统很难适应多变的运行条件,预测结果偏差较大,影响最终的控制效果。随着计算机技术的发展,复杂工业过程中积累了大量生产数据,为我们从人工智能的角度进行建模与优化控制提供了数据基础。 本论文以某大型闪速炼铜企业的闪速熔炼生产过程为研究对象。为了实现铜闪速熔炼工序中的节能减耗,本文提出了一种满足三大工艺指标(冰铜品位,冰铜温度,渣中铁硅比)约束的能效优化模型:首先 ...
董云成
core  

Comprehensive framework for assessing and optimizing existing research networks

open access: yesConservation Biology, EarlyView.
Abstract Conservation, monitoring, and research networks, or collections of ecological research sites unified under a common mission of data collection or a research mission, are essential infrastructure for understanding large landscapes. However, most networks developed opportunistically over decades rather than through systematic design, creating ...
Alyson East   +2 more
wiley   +1 more source

Geographic risks to functional groups of mammals and birds from habitat loss in Mexico

open access: yesConservation Biology, EarlyView.
Abstract There is a need to quantify the impact of habitat loss due to anthropogenic factors on different aspects of biodiversity, such as functional trait diversity represented by functional groups (FGs). We developed a metric to assess the weighted risk of loss of habitat for 33 FGs of mammals and 36 FGs of birds in Mexico based on potential ...
Fernando Mayani‐Parás   +4 more
wiley   +1 more source

基于遗传算法的自动送钻钻压动态优化

open access: yesShiyou jixie, 2012
针对目标函数的钻压优化和BP神经网络的钻压优化方法存在的不足,建立了动态成本目标函数,并利用遗传算法对动态成本目标函数进行优化,最后应用实例对优化送钻在成本上的优势进行了验证。根据建立的动态成本目标函数和钻井采集的实时数据,利用非线性回归理论完成待优化的成本目标函数参数的求取。优化结果表明,优化钻压钻井方式有效延长了钻头寿命,缩短了起下钻时间,节省了钻井成本;与恒钻压钻井方式相比,优化钻压钻井方式每米成本上升较慢。
张奇志, 付勃
doaj  

Experimental Measurement of Interdiffusivities and Calculation of Diffusion Kinetics in Some bcc Ti-based Alloys Systems [PDF]

open access: yes, 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
core  

Constructed value of information with iterative scoring and parametric uncertainty to identify management‐relevant research priorities for a declining raptor species

open access: yesConservation Biology, EarlyView.
Abstract Constructed value of information (CVoI) is an expert elicitation decision‐analytic tool used to prioritize sources of uncertainty based on their potential to improve decision outcomes if resolved. Despite increased application of CVoI, the robustness of CVoI prioritization of sources of uncertainty relative to differences in expert elicitation
Kristin P. Davis   +7 more
wiley   +1 more source

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