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基于改进模糊支持向量回归模型的机场能源需求预测 被引量:8
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作者 王坤 员晓阳 王力 《计算机应用》 CSCD 北大核心 2016年第5期1458-1463,共6页
针对离群点在机场能源数据的预测和分析中存在干扰等问题,建立了一种基于改进模糊支持向量回归(FSVR)的机场能源需求预测模型。首先,采用模糊统计法对测试样本集、系统参数和模型输出进行分析,推导出符合其数据分布的基本隶属函数形式;... 针对离群点在机场能源数据的预测和分析中存在干扰等问题,建立了一种基于改进模糊支持向量回归(FSVR)的机场能源需求预测模型。首先,采用模糊统计法对测试样本集、系统参数和模型输出进行分析,推导出符合其数据分布的基本隶属函数形式;其次,结合例证法、专家经验法对隶属函数进行"再学习",逐步修改和完善正态隶属函数a、b参数值,半梯形隶属函数边界参数值及三角隶属函数p、d参数值,以此消除或减少不利数据挖掘的离群点,同时保留有效关键点;最后,结合支持向量回归(SVR)算法,建立预测模型,并验证了该模型的可行性。实验结果表明,与反向传播(BP)神经网络方法相比,FSVR方法的预测准确率提高了2.66%,对离群点的识别率提高了3.72%。 展开更多
关键词 机场能源需求预测 模糊支持向量回归 支持向量机 模糊隶属度 离群点
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机场交通需求概率密度预测方法研究
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作者 田文 杨帆 +1 位作者 郭怡杏 宋津津 《计算机仿真》 北大核心 2022年第1期56-59,共4页
针对基于进离场航空器统计数量的传统预测方法较难体现不确定性因素对机场交通需求预测结果影响的问题,采用核密度估计与神经网络分位数回归相结合的方法,构建了机场交通需求概率密度预测模型和方法,并基于广州白云机场运行数据得到机... 针对基于进离场航空器统计数量的传统预测方法较难体现不确定性因素对机场交通需求预测结果影响的问题,采用核密度估计与神经网络分位数回归相结合的方法,构建了机场交通需求概率密度预测模型和方法,并基于广州白云机场运行数据得到机场交通需求在未来一定时间内的概率密度分布。预测结果相较传统BP神经网络预测,所得结果波动范围更小,误差更小。 展开更多
关键词 分位数回归神经网络 核密度估计 概率密度预测 机场交通需求
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基于聚类神经网络的机场拥挤等级预测 被引量:6
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作者 李善梅 徐肖豪 孟令航 《计算机工程与应用》 CSCD 2013年第17期254-257,共4页
对机场拥挤机理进行分析;从后果类指标入手,提出基于饱和度的拥挤等级评价方法,建立机场拥挤5色预警等级,从原因类指标入手,提取出分别刻画机场容量和需求的5个拥挤特征指标;提出了基于聚类的神经网络分类算法;利用ATL机场实际航班数据... 对机场拥挤机理进行分析;从后果类指标入手,提出基于饱和度的拥挤等级评价方法,建立机场拥挤5色预警等级,从原因类指标入手,提取出分别刻画机场容量和需求的5个拥挤特征指标;提出了基于聚类的神经网络分类算法;利用ATL机场实际航班数据进行实例验证,拥挤等级预测的准确度达到80%,预测效果优于BP神经网络。结果表明,提出的方法预测效果较好,具有一定的实用性。 展开更多
关键词 机场拥挤 机场需求 机场容量 航班延误 神经网络 聚类
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机场群容量资源战略一体化配置方法
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作者 聂建雄 刘畅 王艳军 《交通运输工程与信息学报》 2023年第4期115-128,共14页
为了提高机场群机场资源和空域资源的利用效率,减少预期航班延误,本文提出了一种机场容量和空域容量一体化的配置方法,在满足航班运行、机场和空域容量等约束下最小化时刻配置成本。本文提出的一体化方法主要包括三个模型:时刻配置模型... 为了提高机场群机场资源和空域资源的利用效率,减少预期航班延误,本文提出了一种机场容量和空域容量一体化的配置方法,在满足航班运行、机场和空域容量等约束下最小化时刻配置成本。本文提出的一体化方法主要包括三个模型:时刻配置模型、扇区随机排队模型和扇区容量战略配置模型。时刻配置模型考虑了机场容量资源和时刻配置规则对航班时刻进行配置;扇区随机排队模型用来计算配置后的时刻表在战术运行时的预期延误;空域容量配置通过分配扇区内各个航路点的容量,为处于高峰时段的航路点提供更多的容量以减少延误。本文将提出的一体化配置方法应用于粤港澳大湾区机场群,对2019年12月21日的容量资源进行优化配置。实验结果表明,相比于现有的时刻优化配置、空域战术管理这一顺序决策过程,本文所提方法可以更显著缓解空域内的拥堵情况,并减少战略时刻分配成本。本文的模型为机场群的时刻和容量配置提供了一个方法,该模型在未来可以应用于机场群的战略空中交通管理过程,为时刻协调、空域管理和流量管理提供参考。 展开更多
关键词 航空运输 容量资源配置 机场需求容量管理 机场群运行 航班时刻优化
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区域协同视角下长三角机场群客运市场的竞合分析
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作者 何音 赵中华 《中国商论》 2020年第19期32-34,共3页
随着2018年长三角区域一体化发展上升为国家战略,实现地区航空运输业协调发展,共同打造世界级机场群,成为该城市群集中优势资源,打造对外开放新格局的重点任务。研究基于对机场群发展环境与现状分析,经过对未来市场空间的预判,寻找出区... 随着2018年长三角区域一体化发展上升为国家战略,实现地区航空运输业协调发展,共同打造世界级机场群,成为该城市群集中优势资源,打造对外开放新格局的重点任务。研究基于对机场群发展环境与现状分析,经过对未来市场空间的预判,寻找出区域内各层级机场发展面临的机遇与挑战,并从合理分工、适度竞争角度提出了机场群协同发展的建议。 展开更多
关键词 长三角机场需求 预测 竞合分析
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Diversity of Organic Produce in Indonesia
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作者 Nyoman Oka Tridjaja 《Journal of Food Science and Engineering》 2016年第1期38-42,共5页
Organic farming in Indonesia has been developed quite pass in the last five years. This evidence was pushed by increasing the demand either in domestic or in foreign market. The increase of demand was due to the icrea... Organic farming in Indonesia has been developed quite pass in the last five years. This evidence was pushed by increasing the demand either in domestic or in foreign market. The increase of demand was due to the icrease of awareness of society to healthy and savety food for people. Related to this isues the Government of Indonesia has built an Organic Farming Competence Authority (OKPO). This Competent has responsibilities to facilitate and administrate organic farming business in Indonesia. The diversity of organic produced in Indonesia is mostly paddy/rice, and followed by other organic products such as nutmeg, cashew nut, cinnamon, capsicum, mangosteen, brown sugar or other coconut products, cocoa bean, coffee bean, clover, pepper, Zalacca, lychee, longan, duku (lanseh) and some fruits and vegetables. Mostly organic produce is exported to foreign coutries. There are also some assosiations such as Indonesia Organic Aliance (AOI), Indonesia Farmer Organic Assosiation (APOI), Community Concern Organic Farmer (CCOF) who support the development of organic movement. Certification Body for Competency of Inspectors and Facilitators for organic divelopment either for plant or livestock has just been established. 展开更多
关键词 Organic farming certification Organic Fanning Competence Authority (OKPO) Organic Certification Body (LSO) organic produce diversity.
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A Study of the Effect of Computer Technology on Translation
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作者 Shangyi WU 《International Journal of Technology Management》 2015年第5期82-84,共3页
Under the background of global economic development, Training to meet market demand, the excellent translation professionals is imperative, as the professional computer aided translation is a very important subject of... Under the background of global economic development, Training to meet market demand, the excellent translation professionals is imperative, as the professional computer aided translation is a very important subject of college professional translation, it should be combined with market demand. In this paper, we analyzed and proposed practical solutions to the importance of computer-aided translation programs and the problems and difficulties currently faced. To create student-centered teaching principles, the computer translation soRware is the basis, and combines with a wide range of resources to adapt to a full range of training qualified personnel translation market. 展开更多
关键词 computer-aided translation TEACHING RESEARCH
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The Engineering Professional and the Labor Market Demands: Electronic Engineer and Mechanical Engineer
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作者 Aldair Oliveira de Andrade Antonio Marcos de Oliveira Siqueira Lucas Henrique Figueiredo Prates 《Journal of Mechanics Engineering and Automation》 2014年第7期616-624,共9页
The purpose of this study is to present results of a jobs classified survey from a newspaper in circulation in the city of Manaus (AM, Brazil), between late 1990s and early 2000s. The structure and functionality of ... The purpose of this study is to present results of a jobs classified survey from a newspaper in circulation in the city of Manaus (AM, Brazil), between late 1990s and early 2000s. The structure and functionality of the CBO (Brazilian Occupational Classification) 2002, fundamental tool for data analysis was used, followed by collection, diagnosis and data analysis to identify the characteristics and transformations of the occupational tasks of the electronic and mechanical engineer. The analysis was based on CBO data in three distinct steps described in the methodology section, compared with a study conducted in the early 1990s, and finally, the overall prevailing trend required in professional engineering training in times of complexity and in the knowledge era was presented. 展开更多
关键词 Engineering education occupational profile Brazilian classification of occupations skills and abilities.
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Innovative Services Models Based on "Four new" Economy
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作者 Li Changhao Xu Qi 《Review of Global Academics》 2014年第4期335-340,共6页
The propose of "four new" economy is to undertake innovation-driven transformation of Shanghai, promote the development of strategic emerging industries and transform and upgrade of manufacturing. In the following y... The propose of "four new" economy is to undertake innovation-driven transformation of Shanghai, promote the development of strategic emerging industries and transform and upgrade of manufacturing. In the following years, Shanghai will focus on the capture of key technologies, promoting the transformation of technology, expanding market demand, improving the development of the carrier, encouraging and supporting enterprises, financial institutions and social capital to increase the investment and use of"four new" economy, to promote the "four new" economy gradually grow and develop. With the "four new" economy's development and growth, its service model should be changed too. On the basis of theory and practice, the text proposes three forms of innovative services models and relate recommendations to promote it. 展开更多
关键词 "four new" economy service model INNOVATION
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