查詢結果分析
相關文獻
- Division of Air Basins Utilizing Principal Component Analysis Over Taiwan
- Air Basins Determined in Taiwan-Preliminary Results
- 應用主成分分析法於葡萄酒化學成分分析
- 集水區水質變遷特性之獨立成分分析
- 海大、海專及海事高職航海相關科系畢業生上船工作意願差異之研究
- Comparison of Principal Components Analysis and Minimum Noise Fraction Transformation for Reducing the Dimensionality of Hyperspectral Imagery
- 資料挖掘技術使用在離子植入機製程之配方分類系統研究
- 金融預警系統之動態模式
- 主成分分析在土壤環境科學上應用
- 臺灣市售包裝茶飲料物理化學特性與官能品質之探討
頁籤選單縮合
題名 | Division of Air Basins Utilizing Principal Component Analysis Over Taiwan=以主成分分析法分類臺灣地區的氣源區 |
---|---|
作者 | 余泰毅; 張能復; | 書刊名 | 中國環境工程學刊 |
卷期 | 9:3 1999.09[民88.09] |
頁次 | 頁209-218 |
分類號 | 445.63 |
關鍵詞 | 氣源區; 主成分分析; Varimax旋轉法; Air basins; Principal component analysis; Varimax rotation method; |
語文 | 英文(English) |
中文摘要 | 本文以環保署空氣品質監測站1993∼1998年的日臭氧最大小時濃度資料作為樣本空間,利用主成分分析法將臺灣地區分成具有不同臭氧濃度特徵的氣源區。Varimax旋轉法可將臺灣地區分成五個次區域、分別為北基、桃園、中西部、南高屏及東臺灣五個次區域,其對於總變異量的解釋度為75.5%。與整個臺灣地區比較,南高屏與中西部次區域具有較高之的平均日臭氧最大小時值,北基、桃園及東臺灣次區域的平均值則較低。日臭氧最大小時值超過120ppb的機率,以南高屏及北基次區域最高,分別高達5.09%與2.46%。不同次區域的主成分分數之時間序列分析結果顯示,南高屏與中西部次區域具有強烈的季節性變化,其中成分分數的高值集中於秋春兩季。北基次區域的高值則集中於夏春季,桃園次區域的高值集中於4-5月及7-9月;至於東臺灣的高值則集中於春季。Varimax旋轉法的結果與目前七大空品區的原始邊界比較後,建議可將臺灣地區分成八個具有個別臭氧濃度特徵的氣源區;除了將桃竹苗空品區切割成桃園及竹苗氣源區外,其餘氣源區與原來空品區的邊界維持不變。 |
英文摘要 | The data analysis based on ozone monitoring in this investigation attempts to determine the division of air basins in Taiwan by using Principal Component Analysis (PCA) as a tool. The database of ozone employed in this study are obtined from the R.O.C. Environmental Protection Administration (R.O.C. EPA). The use of Kaiser's varimax rotation may lead to the delineation of five homogenous subregions, cumulatively accounting for 75.5% of total variance. Comparative study within these five subregions exhibits findings. The Tainan-Kaohsiung-Pingtung and midwestern Taiwan subregions present higher daily 1-h maximum ozone concentrations than those of the domain. Concentrations are lower than the domain average for the Taipei-Keelung, Tao-Yuan and eastern Taiwan subregions. The percentiles of observations exceeding 120 ppb are greatest in the Tainan-Kaohsiung-Pingtung (5.09%) and Taipei-Keelung (2.46%) subregions. Time series analysis of rotated component scores associated with the subregions reveals that the Tainan-Kaohsiung-Pingtung and midwestern Taiwan subregions tend to present a strong seasonal cycle, with maximum ozone concentrations during autumn and spring. Moreover, the highest ozone concentrations appear during summer and spring in the Taipei-Keelung subregion and from April to May and July to September in the Tao-Yuan subregion. The Eastern Taiwan subregion experiences positive component scores during spring. By compiling the results of the rotational method and original boundary lines of seven air pollution control regions, this study also proposes a delineation of eight air basins having homogenous ozone features as an alternative suggestion. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。