| DC 欄位 |
值 |
語言 |
| DC.contributor | 資訊管理學系 | zh_TW |
| DC.creator | 趙書榮 | zh_TW |
| DC.creator | Shu-Jun Chao | en_US |
| dc.date.accessioned | 2002-10-22T07:39:07Z | |
| dc.date.available | 2002-10-22T07:39:07Z | |
| dc.date.issued | 2002 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=87423020 | |
| dc.contributor.department | 資訊管理學系 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | 摘要
目前挖掘關聯規則的演算法可依需不需產生candidate itemset的作法分為兩類，例如Frequent-Pattern tree與Apriroi-like approach。此兩者最主要的差異在於，FP-tree並不產生candidate itemsets，它將資料庫壓縮在Frequent-Pattern tree的結構中，避免多次的高成本的資料庫掃瞄；後者是需要產生candidate itemset的方法。
而本文的目的是以應用Frequent-Pattern tree之理論，在實作方面以不同資料結構技術作效能比較測試，得到以那一種資料結構應用在Frequent-Pattern tree上執行時間之效能較佳。
在本文中共建立了(一)FP-tree_tail演算法，tail為在head table中增加一個tail欄位，(二)FP-tree_hash演算法，hash為以hash function計算出每個node所在位置方式建立FP-tree，(三)FP-tree_hash+tail演算法，為結合(一)、(二)之優點，所完成之演算法.，並將以上三個演算法與傳統FP-tree演算法一起比較，以找出各演算法之優缺點。經由本文實驗測試資料數據中，發現在各種實驗參數下，傳統FP-tree演算法所需花費之時間，為三個改良FP-tree演算法的數十倍。 | zh_TW |
| dc.description.abstract | now the algorithm in the association rules can be seperated two kinds.first is Apriori-like approach.second is Frequent-Pattern tree.main different between the above is the Frequent-Pattern tree did not to generate the candidate itemsets.its avoid a huge cost to scan database many times.
this paper apply three different data structure(FP-tree_tail,FP-tree_hash,FP-tree_hash+tail) to improve Frequent-Pattern tree algorithm .then to compare the performance about them ,
accroding to the test data we found the performance of the FP-tree alogrithm are worst then the other algorithms many times. | en_US |
| DC.subject | 資料挖掘 | zh_TW |
| DC.subject | 關聯規則 | zh_TW |
| DC.subject | 演算法 | zh_TW |
| DC.subject | FP-tree | zh_TW |
| DC.subject | data mining | en_US |
| DC.subject | association rule | en_US |
| DC.subject | algorithm | en_US |
| DC.subject | FP-tre | en_US |
| DC.title | FP-Tree不同實作方式之效能比較 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | FP-Tree in different implement methods to compare the performances | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |