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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

多維度資料庫設計方法之研究

李淑銘 Unknown Date (has links)
在經常變動的競爭環境中,經理人需要快速靈活的掌握資訊,以為決策所用。資訊部門為因應這些需求,必須設計一套滿足使用者動態的資訊需求的資料庫管理系統。本研究提出一套以集合為基礎的表達方式定義多維度資料庫,同時提出設計多維度資料庫的方法,並以一行銷公司─南聯國際貿易公司為例,將本論文所提出的方法加以探討、驗證。
2

針對社群媒體上的趨勢變化之視覺化探索工具 / A study of visual exploration tool for comparing trend

郭建凱, Kuo, Jian-Kai Unknown Date (has links)
隨著社群媒體的普及,新聞媒體與意見領袖逐漸重視在社群媒體上以貼文方式發佈新聞資訊,社群媒體成為許多使用者會接收新聞與重大事件的主要管道且透過社群媒體的評論、分享與按讚等互動機制表達立場,這些即時互動行為是傳統媒體缺乏的機制,如何分析也是研究上的挑戰。本研究將針對Facebook上的貼文與互動行為進行分析,提供一款互動視覺化系統,找出貼文資料集中相似的貼文群集以及隨著時間推移下貼文屬性的變化,進一步瞭解Facebook上使用者、貼文與重大事件之間的相互影響。由於Facebook上的貼文與互動行為具多維度屬性,我們透過降維演算法將大量的貼文以二維散佈圖呈現,達到將相似貼文分群的效果。另外,我們設計了一種視覺化呈現方法,「Time Block」,突顯出時間的推移下貼文屬性的變化,藉此觀察出貼文資料集是否存在特定的模式。最後提供即時互動的操作介面,以及貼文屬性以及關鍵字兩者的統計,藉此連接到貼文集的屬性與時間的分佈關係,協助以視覺化方式進行探索與分析。最後,透過案例分析與使用者測試呈現此視覺化探索工具的優缺點。 / Social media becomes an essential medium for broadcast news. News media and option leader post information and people love to receive news and interactive using comment and likes to feedback. It is a research challenge to analysis this massive amount interactive behavior data in social media. In this paper, we propose an interactive visualization system to explore on the posts and interactions on Facebook. This system can help a user to find out the similar interactive behavior cluster and the trend of time-varying attributes to understand how the users, posts, and a big event to affect each other. Facebook Posts and interactive behavior contains multiple dimensional attributes; we adopt the dimensional reduce algorithm and 2D scatter plot to present the cluster in the spatial domain. Then, we design a time-varying visualization method, `Time Block,' can highlight the changing attributes and observe the unique pattern in the time domain. Also, we design a real-time interactive interface to connect the cluster and trend visualization with additional keyword distribution and attribute statistics. Finally, we use case study and user study to demonstrate the advantage of the proposed system.
3

An XML-based Multidimensional Data Exchange Study / 以XML為基礎之多維度資料交換之研究

王容, Wang, Jung Unknown Date (has links)
在全球化趨勢與Internet帶動速度競爭的影響下,現今的企業經常採取將旗下部門分散佈署於各地,或者和位於不同地區的公司進行合併結盟的策略,藉以提昇其競爭力與市場反應能力。由於地理位置分散的結果,這類企業當中通常存在著許多不同的資料倉儲系統;為了充分支援管理決策的需求,這些不同的資料倉儲當中的資料必須能夠進行交換與整合,因此需要有一套開放且獨立的資料交換標準,俾能經由Internet在不同的資料倉儲間交換多維度資料。然而目前所知的跨資料倉儲之資料交換解決方案多侷限於逐列資料轉換或是以純文字檔案格式進行資料轉移的方式,這些方式除缺乏效率外亦不夠系統化。在本篇研究中,將探討多維度資料交換的議題,並發展一個以XML為基礎的多維度資料交換模式。本研究並提出一個基於學名結構的方法,以此方法發展一套單一的標準交換格式,並促成分散各地的資料倉儲間形成多對多的系統化映對模式。以本研究所發展之多維度資料模式與XML資料模式間的轉換模式為基礎,並輔以本研究所提出之多維度中介資料管理功能,可形成在網路上通用且以XML為基礎的多維度資料交換過程,並能兼顧效率與品質。本研究並開發一套雛型系統,以XML為基礎來實作多維度資料交換,藉資證明此多維度資料交換模式之可行性,並顯示經由中介資料之輔助可促使多維度資料交換過程更加系統化且更富效率。 / Motivated by the globalization trend and Internet speed competition, enterprise nowadays often divides into many departments or organizations or even merges with other companies that located in different regions to bring up the competency and reaction ability. As a result, there are a number of data warehouse systems in a geographically-distributed enterprise. To meet the distributed decision-making requirements, the data in different data warehouses is addressed to enable data exchange and integration. Therefore, an open, vendor-independent, and efficient data exchange standard to transfer data between data warehouses over the Internet is an important issue. However, current solutions for cross-warehouse data exchange employ only approaches either based on records or transferring plain-text files, which are neither adequate nor efficient. In this research, issues on multidimensional data exchange are studied and an XML-based Multidimensional Data Exchange Model is developed. In addition, a generic-construct-based approach is proposed to enable many-to-many systematic mapping between distributed data warehouses, introducing a consistent and unique standard exchange format. Based on the transformation model we develop between multidimensional data model and XML data model, and enhanced by the multidimensional metadata management function proposed in this research, a general-purpose XML-based multidimensional data exchange process over web is facilitated efficiently and improved in quality. Moreover, we develop an XML-based prototype system to exchange multidimensional data, which shows that the proposed multidimensional data exchange model is feasible, and the multidimensional data exchange process is more systematic and efficient using metadata.
4

科技政策網站內容分析之研究

賴昌彥, Lai, Chang-Yen Unknown Date (has links)
面對全球資訊網(WWW)應用蓬勃發展,網際網路上充斥著各種類型的資訊資源。而如何有效地管理及檢索這些資料,就成為當前資訊管理的重要課題之一。在發掘資訊時,最常用的便是搜尋引擎,透過比對查詢字串與索引表格(index table),找出相關的網頁文件,並回傳結果。但因為網頁描述資訊的不足,導致其回覆大量不相關的查詢結果,浪費使用者許多時間。 為了解決上述問題,就資訊搜尋的角度而言,本研究提出以文字開採技術實際分析網頁內容,並將其轉換成維度資訊來描述,再以多維度資料庫方式儲存的架構。做為改進現行資訊檢索的參考架構。 就資訊描述的角度,本研提出採用RDF(Resource Description Framework)來描述網頁Metadata的做法。透過此通用的資料格式來描述網路資源,做為跨領域使用、表達資訊的標準,便於Web應用程式間的溝通。期有效改善現行網際網路資源描述之缺失,大幅提昇搜尋之品質。

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