Tropical Geography ›› 2021, Vol. 41 ›› Issue (3): 584-595.doi: 10.13284/j.cnki.rddl.003342
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Jianke Guo1,2(), Yidan Ding1,2, Yafeng Qin3
Received:
2020-08-08
Revised:
2021-01-11
Online:
2021-05-30
Published:
2021-06-30
CLC Number:
Jianke Guo, Yidan Ding, Yafeng Qin. Spatial Links of the Maritime Scientific Research Cooperation Network in China[J].Tropical Geography, 2021, 41(3): 584-595.
Table 1
Indicators of scientific research cooperation in urban networks and their implications
指标 | 测算方式 | 物理意义 | 实际含义 |
---|---|---|---|
度中心性 | 式中:N表示节点个数;节点aij表示海洋科研合作邻接矩阵。 | 度数中心度越高,说明该城市海洋科研合作的重要性越突出,越居于网络的中心位置,从而衡量一个城市与其他城市海洋科研联系的能力。 | |
介数 中心性 | 式中:Njk(i)是节点vj和vk之间的最短路径条数,Njk(i)表示节点vj和vk之间的最短路径经过节点vi的条数。 | 如果一个城市处于通往其他城市的捷径(最短途径)上,该城市就具有较高的中间中心度,即在海洋科研合作中具有沟通其他城市的桥梁作用。 | |
接近度 中心性 | 式中:dij表示节点i与j之间的最短路径数;N表示节点个数。 | 城市i的接近中心度越大,科研知识流动越便捷。 |
Table 2
Comparison of overall characteristics of Marine scientific research cooperation networks in 2007 and 2017 with those in other fields
合作网络类型 | 节点数/个 | 网络密度 | 平均度 | 平均加权度 | 平均路径长度 | 平均聚类系数 | 空间分布情况 |
---|---|---|---|---|---|---|---|
中国海洋科研合作网络(2007) | 127 | 0.21 | 7.452 | 25.2 | 1.536 | 0.768 | “发散型” |
中国海洋科研合作网络(2017) | 134 | 0.26 | 10.358 | 35.2 | 1.035 | 0.739 | “梯形” |
中国CNKI合作网络(2016)(赵星,2017) | 32 | — | — | — | 1.001 | 0.738 | — |
中国创新网络(2015)(周灿 等,2017) | 287 | — | 7.512 | — | 2.091 | 0.688 | “菱形” |
中国创新网络(2015)(段德忠 等,2018) | 338 | 0.10 | — | — | 0.606 | 1.968 | “四边形” |
中国专利合作网络(电子信息类)(高曼 等,2018) | 278 | 0.02 | 8.057 | 20.5 | — | 0.519 | — |
中小企业专利合作网络(王黎萤,2018) | 48 | 0.01 | — | — | 1.061 | 0.662 | — |
中国集装箱运输网络(郭建科 等,2018) | — | — | — | — | 1.724 | 0.708 | “轴—辐” |
中国总部—分支城市网络(吴康 等,2015) | 330 | — | 5 | — | 1.901 | 0.618 | “菱形” |
Table 3
The city level of the ocean research collaboration network in 2007 and 2017
层级 | 2007年(点度数) | 2017年(点度数) |
---|---|---|
国家级核心 | 青岛(648.99)、北京(454.01) | 青岛(757.49)、上海(593.16)、北京(545.83)、广州(415.34)、大连(272.17) |
区域性中心 | 上海(287)、广州(230.01)、大连(152) | 天津(165.99)、南京(148.33)、武汉(138)、烟台(121.01)、杭州(121)、厦门(113.17)、宁波(105.17)、舟山(104.01)、湛江(71.17) |
一般城市 | 厦门(122.01、)武汉(95)、杭州(93)、南京(88.99)、天津(85.99)、湛江(63)、哈尔滨(59)、无锡(53)、烟台(39) | 哈尔滨(62)、深圳(51)、威海(39.99)、镇江(37)、无锡(36)、成都(35.16)、南通(33.17)、福州(32)、南宁(32)、海口(31.17)、三亚(27.17)、北海(25)、西安(24.17)、连云港(24)、东营(24)、郑州(24)、沈阳(22)、济南(21)、锦州(20)、秦皇岛(16)、温州(16)、长沙(16) |
边缘城市 | 西安、东营、深圳、舟山、连云港、宁波、济南、沈阳、海口等共110个地级市 | 长春、潍坊、湖州、盘锦、珠海、宁德、贵阳、钦州、南昌、日照等共98个地级市 |
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