準確地追蹤傳染病例如流感的發展趨勢，可以幫助公衛單位做出及時且有意義的決策，對於穩定民心與挽救民眾生命有著極大幫助。傳統的疫病活動監測系統是以事後回報的確認病歷來統計，與實際流行高峰會有著至少1週以上的報告延遲，而在活絡的網路社群的訊息中，人們卻可能早已揭露出集體憂慮。因此，藉由快速的資訊檢測，來監測疫病活動信號，是有可能事先偵測並追蹤疫病擴散的趨勢，擁有社群巨量資訊的Yahoo與Google這些網路搜尋引擎提供者都曾投入相關研究。本論文以流感的流行趨勢為研究目標，擷集了2010至2016年間台灣地區的衛福部疾管署統計資料、Google Trends線上資料及King Net國家網路醫藥資料，以線性與非線性方法分別分析三者間的相互關連性，並建立出相互關係模式，藉由歷史資料來作檢測，可以發現在三者線性相關性較高的各年份，非線性分析也得到相同結果。本論文所提出之非線性趨勢預測架構，在有較大流行疫情的年份中，都可以捕捉到該區間趨勢的變化，證明了社群線上巨量資訊可作為間接監測流感活動信號之媒介，由此建立的流行趨勢預測模式，可提供及早因應流感流行之建議。

Accurate tracking the outbreak of an infectious disease, like influenza, helps Public Health to make timely and significant decisions that could calm the fear of people and save lives. A traditional disease caring system based on confirmed cases reports an outbreak typically with at least one-week lag. Therefore, some surveillance systems by monitoring indirect signals about influenza have been proposed to provide a faster unearthing. The volume of those signals is huge and could be pick out from social networks or searching databases. Yahoo and Google, the top two internet search providers who own those Big Data had fired researches about disease tracking ever. In this study, we first draw out the huge influenza signals from CDC (Central Disease Control, Taiwan) database, Google Trends database and King Net database. Then, the linear and nonlinear analyses between three databases are investigated. We found a high correlation existed between series drawn from three databases in years (2011-2016) under survey regardless of linear or nonlinear analysis. Furthermore, we proposed a nonlinear tracking model to capture changes in this epidemic trend, and we can detect the outbreak of influenza more early in years with heavy infectious. These results prove that the signals exposed on networks can provide rich material to trend events of human society.

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