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题名舰船一体化网络应用研究
被引量:2
- 1
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作者
杨楚平
赵刚
马超
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机构
中国船舶工业系统工程研究院
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出处
《舰船科学技术》
北大核心
2019年第19期168-172,共5页
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文摘
为了提高舰船信息集成水平,推动舰船一体化网络技术的应用,本文分析国内外舰船网络的应用现状和发展趋势,通过对商用主流网络技术的舰载适用性分析,提出舰船一体化网络适合采用的技术体制,并给出舰船一体化网络应用建议,能为舰船一体化网络设计提供借鉴与参考。
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关键词
全舰计算环境
舰船一体化网络
多业务传输平台
分组传送网
电信级以太网
体系结构
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Keywords
total ship computing environment
warship integrated network
multi-service transfer platform
packet transport network
carrierethernet
architecture
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分类号
U662.9
[交通运输工程—船舶及航道工程]
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题名多巴胺系统基因对注意网络的调控作用
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作者
陈晨
张英
刘嘉
胡思源
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机构
北京师范大学心理学部应用实验心理北京市重点实验室心理学国家级实验教学示范中心(北京师范大学)
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出处
《心理科学》
CSSCI
CSCD
北大核心
2018年第1期24-30,共7页
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基金
国家自然科学基金青年科学基金项目(31000507)的资助
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文摘
多巴胺是脑内重要的神经递质之一,与注意活动紧密相关。本文选取作用于突触前膜、间隙和后膜的多巴胺系统基因——多巴胺转运蛋白基因、儿茶酚氧化甲基转移酶基因和多巴胺受体基因,整合影像遗传学研究,探讨多巴胺基因对注意网络的调控。元分析发现背侧和腹侧注意网络的主要脑区均有较大的基因调控效应,且腹侧网络的效应值显著大于背侧网络,表明多巴胺系统基因在全脑范围内调控注意网络,且对腹侧网络的调控作用强于背侧网络。
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关键词
注意网络
功能磁共振成像
影像遗传学
多巴胺系统
元分析
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Keywords
included but not limited to functional magnetic resonance imaging (tMRI), and candidate doparninergic system genes targeting at the presynaptic, the postsynaptie neurons, or the synaptic cleft, such as the dopamine transporter gene (DAT), the catechol-O-methyltransferase gene (COMT) or the dopamine receptor gene (DRD). Reference lists were checked by hand and a total of forty-four papers were gathered and applied to our meta-analysis. We extracted the coordinates of peak voxels where the genetic modulatory effect on attention was reported in the papers and then projected them onto a brain template in Caret to visualize the distribution of the modulatory effects of genes. The effect sizes were calculated using Cohen's d to quantify the magnitude of activation differences between the subjects with separate ganotypes in each att
ntion task. The random-effects model was chosen for the meta-analysis and the effect sizes of effective modulation of dopaminergie system genes in different brain regions were calculated with Comprehensive Meta-Analysis program (CMA). To compare the differences across attention networks and dopaminergic genes, the Q-test of homogeneity was used to test for variations in effect sizes. Our results showed that the integrated effect sizes of effective modulation of dopaminergic system genes were all above .8 (Cohen's d) in the ventral attention network (VAN), including the ventral prefrontal cortex (VLPFC), the orbitofrontal gyms (ofG), and the superior temporal gyms (STG), and also in the dorsal attention network (DAN), consisting of the dorsolateral prefrontal cortex (DLPFC), the superior parietal lobule (SPL) and the frontal eye field (FEF). The VAN presented a significantly higher effect size in comparison to the DAN (Qb = 4.94,p 〈 .05). In addition, the variation test of effect sizes for dopaminergic system genes showed that the COMT gene exhibited a significantly higher effect size than that of DAT gene (Qb = 77.04,p 〈 .001) and DRD gene (Qb = 186.35,p 〈 .001). Our study suggests the important role of the dopaminergic system genes in regulating attention networks in the whole brain. As DAN enables the selection of sensory stimuli based on internal goals and VAN detects salient and relevant stimuli in the environment. The observed stronger modulatory effect of dopaminergic system genes in VAN than in DAN suggests that bottom-up attention, compared with top-down attention, receives more modulation from genes than from the environment. Our study invites broader and deeper studies on the relationship between the genes, the brain, and the attentional behaviors at the network level in the future. Key words attention networks, MRI, imaging genetics, doparninergic system, meta-anaiysis
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分类号
R338
[医药卫生—人体生理学]
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题名常规公交线网的低碳双层优化模型
被引量:2
- 3
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作者
杨明
宫熙桢
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机构
长沙理工大学交通运输工程学院
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出处
《公路交通科技》
CAS
CSCD
北大核心
2015年第11期143-147,158,共6页
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基金
交通运输部联合科技攻关项目(2008353363430)
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文摘
以研究如何有效降低常规公交线网的碳排放量为目标,通过优化调整公交线网中不合理的分布、线路长度、非直线系数、复线系数等指标来实现降低公交线网的碳排放量。在保持常规公交线网一般性能的前提下,从出行人群、公交运营者以及社会环境3方面着手,建立了以线网总时耗、线网总能耗、线网总环境消耗和用户出行平衡为目标的双层优化模型。采用蚁群算法对双层优化模型进行求解,通过合理调整蚁群算法参数,寻找公交线网中的最优线路来实现有效降低公交线网的碳排放量。最后借助算例验证了模型和算法的正确性和有效性。
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关键词
交通工程
低碳优化
双层优化模型
常规公交线网
线网总时耗
线网总能耗
线网总环境消耗
蚁群算法
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Keywords
traffic engineering
low carbon optimization
bi-level optimization model
general public transport network
total energy consumption of public transport network
total environment consumption of transport network
ant colony algorithm
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分类号
U491.13
[交通运输工程—交通运输规划与管理]
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