基于改进CNN-LSTM组合模型的分时段短时交通流预测

针对现有预测模型不能充分提取交通流时空特征的问题,提出一种基于改进卷积神经网络(convolutional neural network,CNN)和长短时记忆(long short-term memory,LSTM)神经网络的短时交通流预测方法.首先,采用分层提取方法使设计的网络结构和一维卷积核函数自动提取交通流序列的...     

基于Delauany三角形的分时段区域管制扇区划分

根据空域和流量状况划分扇区是提高空域容量、改善空域拥挤和减小管制员工作负荷的有效手段。航班数量的不断增加,使得管制员的工作负荷也随之加大,为降低管制员的工作负荷需要研究扇区动态划分。首先对高空区域管制扇区内各航路点一段时期的每天相同时段的飞行流量进行分析,以航路点建立Delauany三角形,按照各时段飞行流量的不同对Delauany三角形进行加权,随后通过聚类分析生成了加权的Voronoi图,然后采用改进的哈夫曼编码理论对扇区进行了合并给出划分方案。最后结合厦门管制扇区数据进行算例分析验证了所提出方法的可行性。     

Notes onq-ary interleaved sequences

(f(x), m)-interleaved sequences over Fq have been proposed and studied. Roughly speaking, an (f(x), m)-interleaved sequence is a sequence which is made of (or say, interleaved by)m component sequences with a common characteristic polynomial (f(x)(∈ Fq[x]). In this note, (f(x), m)-interleaved sequences are studied further. As a result, it is made clear how their minimal characteristic polynomials, linear spans and periods are determined by their component sequences. And also, their period distribution and the number of (f(x), m)-interleaved sequences with maximal linear spans are derived. Furthermore, a large number of interleaved sequences with the lowest correlation among all the (f(x), m)-interleaved sequences are constructed.     

Geomicrobial functional groups: A window on the interaction between life and environments

Microbes are well-known for their great diversity and abundance in modern natural environments.They also are believed to pro-vide critical links among higher organisms and their associated environments.However,the low diversity of morphological fea-tures and structures of ancient microbes preserved in sediments and rocks make them difficult to identify and classify.This diffi-culty greatly hinders the investigation of geomicrobes throughout Earth history.Thus,most previous paleontological studies have focused on faunal and floral fossils.Here,geomicrobial functional groups(GFGs),or a collection of microbes featured in specific ecological,physiological or biogeochemical functions,are suggested to provide a way to overcome the difficulties of ancient mi-crobe investigations.GFGs are known for their great diversity in ecological,physiological and biogeochemical functions.In addi-tion,GFGs may be preserved as the biogeochemical,mineralogical and sedimentological records in sediments and rocks.We reviewed the functions,origins and identification diagnostics of some important GFGs involved in the elemental cycles of carbon,sulfur,nitrogen and iron.GFGs were further discussed with respect to their significant impacts on paleoclimate,sulfur chemistry of ancient seawater,nutritional status of geological environments,and the deposition of Precambrian banded iron formations.     

M/G/1/∞(E,MV)排队系统的注记

考虑M/G/1/∞（E,MV）排队系统,利用全概率分解技术和Laplace-Stieltjes变换, 得到了忙期开始时顾客数的分布律,并给出剩余休假时间分布函数的一种证明.     

秦岭南坡低山区不同土地利用类型土壤微量元素对比分析

以陕南宁陕县旬阳坝镇为例,对比分析了铜、铁、锰、锌4种微量元素在不同土地利用类型中的含量差异.研究结果表明:不同土地利用类型土壤微量元素含量差异明显,铜、铁、锰、锌4种微量元素乔木林地明显高于其他土地利用方式用地,铜、铁元素全量含量乔木林地灌木林地荒草地坡耕地果园,锰、锌元素全量含量乔木林地灌木林地坡耕地果园荒草地,林地最利于微量元素富集;不同退耕年限的林地微量元素迁入与迁出存在差异,微量元素全量含量随退耕年限先减少后增加,在退耕5年左右土壤中微量元素含量达到最大,然后逐渐减少并趋于稳定,稳定后林地微量元素含量仍然高于其他土地利用类型,土地利用类型对土壤微量元素含量的差异起主导作用.     

中国历史四维时标网络初探

以三个时间自然单位，年、月、日为依据，确立中国干支纪时的历元是２５１７ Ｂ． Ｃ；建立起干支纪时的源、流、序、号，并以朝代王年为依托，建立起通贯中国文明社会４５６０ 年的干支纪年、朔闰干支、干支纪日和王位纪年四维时标网络。使散见于中国历史文献，典籍、文物等领域的干支时标，能由源顺流，依序入号，进行时序整理，提供从多方面探讨中国历史时标断代的途径。     

Notes on q-ary interleaved sequences

(f(x),m)-interleaved sequences over Fq have been proposed and studied.Roughly speaking,an (f(x),m)-interleaved sequence is a sequence which is made of (or say,interleaved by) m component sequences with a common characteristic polynomial (f(x)(∈Fq [x]).In this note,(f(x),m)-interleaved sequences are studied further.As a result,it is made clear how their minimal characteristic polynomials,linear spans and periods are determined by their component sequences.And also,their period distribution and the number of (f(x),m)-interleaved sequences with maximal linear spans are derived.Furthermore,a large number of interleaved sequences with the lowest correlation among all the (f(x),m)-interleaved sequences are constructed.     

单摆周期近似解法综述

以求解单摆运动周期为例,首先给出单摆周期的经典解法,然后介绍4种近似的解法,与传统的解法相比具有简单实用的优点.最后对各种情况得到的周期解用作图的方法加以比较.     

定时信用支付条件下的多时段EOQ问题

经典的经济订购批量（EOQ）问题有两个基本假设：时域无限和模型的费用参数不变。对基于供应商提供定时信用支付条件下的有限时域中各时段货价发生变动的EOQ问题进行了研究，并得到了最优订购策略。这为进一步研究买卖方的协作机制提供了新的思路。