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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

Fremont Site Distribution in the Upper Escalante River Drainage

Harris, Deborah C. 13 March 2009 (has links) (PDF)
A Fremont site distribution model for the Grand Staircase-Escalante National Monument during the period A.D. 500—1050/1100 posits that the Fremont subsistence strategy (seasonal mobility with dependence on both agriculture and hunting/foraging) is reflected by a site pattern of low-investment, seasonal or short-term habitation sites and isolated storage facilities at "lowland" elevations, and high-investment, long-term residence sites at "upland" elevations (McFadden 1998, 2000). This research assesses the model to evaluate its general precision, looking particularly at its success in modeling site locations for long-term residential versus seasonal/short-term habitation sites. A database including more than 400 Fremont sites was created to evaluate the model. Data variables examined in this thesis included elevation, distance-to-water, and primary landform. Analysis of the elevation data demonstrates that the McFadden model does not fit the actual distribution of Fremont sites identified from survey. Further analysis also established that distance-to-water is not an effective variable in accurately modeling Fremont site patterning over this region. The association between functional site types and primary landforms, however, does appear to more accurately reflect site distribution as observed on the ground. Based on these results, a new model for Fremont site distribution in the upper Escalante River drainage is proposed.
2

應用情感型態分析於指數股票型基金趨勢研究-以台灣卓越50基金為例 / A study on the trend of exchange traded funds by sentiment pattern analysis in Yuanta Taiwan Top 50 ETF

林詠翔, Lin, Yong-Xiang Unknown Date (has links)
根據研究指出 ETF 資產規模近幾年快速成長,元大台灣卓越 50 基金因市場 規模大等優勢受到投資人的青睞,賴以巨量資料的發展使得文字探勘技術成熟, 故本研究希冀提出一套情感分析的價格預測模型,提升投資者的報酬率。 過往學者以文章中的單詞作為文字探勘的分析單位,常會產生同義詞、多義 詞的問題,因此提出情感型態分析的監督式學習方法建立模型。另外為了解決監 督式學習難以取得訓練資料的限制,本研究混合非監督式學習方法進行主題分群 與情緒傾向標注。 本研究建立台灣股市新聞文本資料集,並篩選熱門議題詞詞庫,進行非監督 式的 LDA 主題模型,發現在 2016 年總統選舉期間,媒體對於公司相關議題的注 意力降低,使得相關的文本數量大幅減少;另外在情緒傾向標注階段,因混和了 NTUSD、知網及自行擴充演算法的情感詞庫,能夠將 10%中性詞彙產生極性判 斷、96%的文本標注情緒傾向。 視覺化工具分析結果指出,DIF-MACD 能夠預測台灣卓越 50 基金的長期走 勢,而新聞情緒指數則在短期的價格波動上表現良好,且在主題模型分群中,總 體經濟、公司維運類別的新聞情緒指數具有約 1-2 日領先指標特性,對於後續的 價格預測模型有所助益。 在監督式情感分析方法,為解決上述同義詞、多義詞的問題,本研究採用型 態分類模型於中文文本,並與向量空間模型、支援向量機等方法做比較。實驗結 果指出優化的型態分類模型,並結合台灣加權股價指數,表現相對良好,F1- Measure 可達 85%。進一步討論新聞情緒對於價格預測的重要性,發現在非交易 時間序列中的新聞情緒,能夠對 0050 的價格波動產生影響。 / The past research points out that the scale of ETF assets has been growing rapidly in recent years. Yuanta Taiwan Top 50 ETF is popular with investors because of the advantages of large market scale. Through the development of Big Data, the technology of Text Mining becomes mature. Thus, we analyze the price forecast model to raise the investors' rate of return. The research of Text Mining used to take the document term to analyze, but it often results in the problem with synonym and polysemy. Therefore, this research proposes a supervised learning method of sentiment pattern analysis. In addition, in order to solve the problem with training data about the supervised learning method, we mix the unsupervised learning method to carry out the subject grouping and sentimental tendency. In this study, we establish the news dataset and screen it as popular terms that are used to an unsupervised method of LDA model. The result points out that the number of news about company dropped significantly during the 2016 Taiwan president election because of the change of media sensation. Moreover, we create the sentiment dictionary that can determine the polarity of 10% neutral terms and the emotional tendency of 96% documents by mixing the NTUSD, HowNet knowledge Database and the self-expansion algorithm. Through the data visualization, the result shows that the curve of DIF-MACD is able to predict the long-term trend of 0050, while the sentiment index of the news makes a good showing in the short-term price volatility. Besides, the news sentiment index of the subjects that belong to general economy and company has about 1 to 2 day leading indicators. Eventually, we employ the Sentiment Pattern Taxonomy Model(PTM) in Chinese texts as supervised learning method and compare with VSM and SVM. The experiment result shows that PTM combined with Taiwan Weighted Stock Index is the best when its F1-Measure is up to 85%. Apart from this, we find that the sentiment index of the news in non-trading time can influence the price volatility of 0050.
3

Rozšiřitelný informační systém sdružení SDC s vícevrstvou architekturou / Extendable Information System of SDC with a Multi-Tier Architecture

Vrážel, Dušan Unknown Date (has links)
This master's thesis deals with analysis, design and implementation of an information system that allows easy extensibility with three-tier architecture.   System is developed using object oriented approach by programming language PHP, relational database server MySQL and web services and protocol SOAP. The View tier is implemented by web technologies XHTML and CSS. Analysis and design of this system is done with using the modeling language UML.     In this thesis is described the problem of multi-tier software architecture, theory of development information's systems and described design and implementation of an information system with a three-tier architecture and it's application in the society SDC.

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