資料探勘已被廣泛應用在各領域，只要該領域擁有具分析價值與需求的資料倉儲或資料庫，皆可利用探勘工具進行有目的的探勘分析。通聯紀錄是指電信用戶間彼此通話聯絡的紀錄，因此在犯罪偵查上，可藉由通聯紀錄的分析加以研判嫌犯的交往關係、生活作息、活動區域及涉案的可能性等，但通聯紀錄的分析要領需要長時間的摸索，才能熟悉相關分析技巧，因此本論文希望結合辦案人員所累積之經驗法則，並透過資料探勘技術，建立一套異常通聯分析模式，以便從大量繁雜的通聯資料中，快速鎖定少數重要人物所使用的關鍵號碼，再從這些關鍵號碼的通聯紀錄中，歸納出極具價值的異常通聯模式，日後只要運用這些異常通聯模式作交叉分析比對，即可迅速找出少數重要對象的電話號碼，提供辦案人員進行案件研判，並提供調閱標的，如此不僅可以有效節省通聯調閱費用，避免浪費公帑，又能協助辦案人員加速案件偵辦的進度。
為驗證本論文中所提方法的可行性，我們將使用真實結案後的通聯資料去建構出一個複合式模型，並評估此模型之預測正確率與穩定性。由於資料探勘的分類工具種類眾多，且每種分析工具都有其優缺點，經觀察與分析本研究的資料特性後，決定採用C5.0、CART、類神經網路及邏輯斯迴歸這四種資料分析工具，並搭配不同比例的隨機抽樣方式，分別去建立單一判別模式，再從中挑選預測能力較佳者來建立複合式模型，以提高預測的精確度。在經過反覆測試評估後，本論文最後將提出整合C5.0決策樹與類神經網路來建立複合式模型，可有效提高預測少數關鍵號碼之精確度。

Data mining has been widely applied to various domains. Once a domain possesses an analysis-valuable and a required data warehouse or database, a mining tool can be utilized to carry out an aimed mining analysis. The CDR (Call Detail Record) refers to the record of communication among telecom users. It can be used to analyze the social relationships, life habits, proximity to action areas, and the possibility of involvement in a crime of a suspect in a criminal investigation. But CDR analysis has to be practiced for a long time in order for personnel to be familiar with the relevant investigating skills. Therefore, this research aims at establishing a set of fraud CDR analysis models to quickly identify the phone numbers of a few important suspects among a large quantity of multifarious call data and determine which are the most valuable fraud call patterns by combining the experience accumulated by investigators and implementing data mining technology. In the future, these fraud call patterns could be used to carry out a comprehensive analysis and comparison. Then the phone numbers of a few important suspects could be identified in order for investigators to do case-analyses and to find consulting objects. This would not only effectively save communication consulting costs and avoid wasting public money, but also would assist law enforcement and accelerate investigative processes.
In order to test the feasibility of the measures proposed by this research, we will use the call data acquired after a case was resolved to construct a multiple model and to evaluate the forecasting accuracy rate and stability of the model. Considering that there are various classification tools for data mining, and each analysis tool has its own advantages and disadvantages, after observing and analyzing the characteristics of the data, we decided on four data analysis tools, namely C5.0, CART, Back Propagation Neural Network, and Logistic Regression. We also added a random sample of different proportions to respectively establish a single discriminate model and selected one model with better forecasting capability to create a multiple model in order to raise the accuracy of the estimation. After an iterative testing and evaluation, the research finally decided to unify the C5.0 decision tree and the Back Propagation Neural Network to establish a multiple model to enhance the accuracy of forecasting all the key phone numbers of important suspects.

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