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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65459

    Title: 專利引證網絡之決定因素-以太陽能光伏為例;The Determinants of Patent Citation Network: The Case of Photovoltaic
    Authors: 葉力慈;Yeh,Li-Tzu
    Contributors: 產業經濟研究所
    Keywords: 專利引證網絡;網絡中心性;社會網絡分析;太陽能光伏;Patent citation network;Node centrality;Social network analysis;Photovoltaic
    Date: 2014-08-26
    Issue Date: 2014-10-15 15:31:55 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本研究以美國核准太陽能光伏相關技術為研究對象,其專利公告年介於1976年1月13日與2014年3月11日之間,並利用Freeman (1979)所提出五個網絡中心性作為衡量專利在引證網絡中的重要程度指標,以Tobit Model作為研究模型,探討影響專利在引證網絡中重要程度的因素為何。首先,探討那些專利特性為影響專利在引證網絡當中重要程度的關鍵因素;接著我們將樣本限縮至申請人為公司,並加入廠商特性變數作探討;最後為申請專利範圍和專利技術覆蓋範圍對於專利引證網絡之非線性關係探討。
    ;The purpose of this article is to investigate the determinants of patent citation network. The analysis is based on patents of photovoltaic granted by the US Patent and Trademark Office (USPTO) from 1976/01/13 to 2014/03/11. The way we weigh the patent in the citation network is “Centrality” proposed by Freeman (1979). In order to find what critical elements affect the position of patent in the citation network most, we use tobit model to analysis. In the beginning, we put patent characteristics variables in our model. Then, we add firm characteristics variables. In the end, we try to figure out if the number of claims or the scope has concave relation toward centrality.
    There are five interesting findings. First, the most important determinant is the time lag between granted year and first cited year. If a patent that is immediately cited by other patent, it will have more direct and indirect forward citations. And the citation lag can also affect the position of a patent in the citation network. Second, if assignee keeps paying the renewal fee, it will raise the frequency of direct and indirect forward citations especially when it is due to the last term. Third, the number of claims has a positive effect toward direct forward citations. The degree of influence decreases as the number of claims increases. Fourth, the use of non-patent knowledge positively affects direct and indirect backward citations. Final, the broader the scope a patent has, the higher the frequency of backward citations and forward citations it can receive. The degree of influence toward indirect forward citation decreases as the scope increases.
    Appears in Collections:[產業經濟研究所] 博碩士論文

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