運用SVR智慧型分類器改善工程粗估之研究

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姓名

李桔萍(Ragil Purnamasari) 查詢紙本館藏

畢業系所

營建管理研究所

論文名稱

運用SVR智慧型分類器改善工程粗估之研究
(Improving Accuracy of Preliminary Cost Estimation Using Support Vector Regression)

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摘要(中)

初步的工程估價在工程專案中是ㄧ個重要的階段。在這個階段，承包商與業主要能評估這個專案是否可行。在印度尼西亞，一個典型的建築專案得花上數周來做初步的工程估價，且誤差值的範圍會從-12.97% 到+26.80%。以往的研究指出，有74%的成本超支是由過低的工程估價造成的。因此，本研究的目的在於：1)確立在印度尼西亞的估價因子2)發展一個支撐向量回歸模型，試圖去改善精準度以及減少初步工程估價的工作時間。文獻回顧辨別出了14個影響世界各地所有的建築專案的估價因子。考慮到這些因素做為模型之基礎，資料隨機取樣，蒐集104項包含有效資訊的印尼建築案例供模型使用。在資料修整、分析以及正規劃後，建立出伴隨徑向基函數核(radial basis function kernel)的SRV模型。以5折交叉驗證來預估以及執行模型，並產出平均95.79%正確率之工程專案初步預估。從SVR模型比原始資料提升了8.71%準確率。過往人工計算初期成本需要以周為單位計算，現行則由模型運算以秒為單位處理，由此可看出對於縮減時間亦是相當重要的。由上述可得知，SRV模型在正確率與省時都是相當優異的。

摘要(英)

Preliminary cost estimation is an important stage for construction projects. During the stage, any contractor and owner is able to determine whether his/her project is feasible. A typical preliminary cost estimation for a building construction project in Indonesia may take weeks and have an error rate varying from -12.97% to +26.80%. Previous studies also concluded that 74% of cost overruns are caused due to underestimation. The research objectives, therefore, are (1) to determine factors that influence cost estimation in Indonesia and (2) to develop a Support Vector Regression (SVR) model in an attempt to improve accuracy and to reduce workhours for preliminary cost estimation. Literature review identified 14 factors that influence cost estimation the most for all types of construction projects around the world. Considering these factors as the model bases, data collection randomly gathered 104 building cases in Indonesia containing valid information for the proposed model. The SVR model with the radial basis function kernel was established after data trimming, analysis, and normalization. The model then was evaluated and implemented using the 5-folds cross validation and yielded the average accuracy at 95.79% for preliminary cost estimation of building construction projects. The accuracy has been improved 8.71% between the original data and the results from the SVR model. Time spent for conducting such a preliminary cost estimation has been significantly reduced from weeks by human estimators to less than one second by the model. The SVR model is efficient in both accuracy and time-saving.

關鍵字(中)

★ 成本估算
★ 分類
★ 支撐向量回歸
★ 建築工程專案

關鍵字(英)

★ Cost Estimation
★ Classification
★ Support Vector Regression (SVR)
★ Building Construction Project

論文目次

TABLE OF CONTENT

ABSTRACT i
摘要 ii
ACKNOWLEDGEMENT iii
TABLE OF CONTENT iv
LIST OF FIGURES vi
LIST OF TABLES vii
CHAPTER I: INTRODUCTION 1
1.1 Research Background 1
1.2 Research Objectives 3
1.3 Research Scope and Limitations 4
1.4 Research Flowchart 4
1.5 Thesis Organization 5
CHAPTER II: LITERATURE REVIEW 6
2.1 Cost Estimation 6
2.1.1 Overview of Cost Estimation 6
2.1.2 Accuracy of Cost Estimation 11
2.1.3 Previous Study of Cost Estimation 13
2.2 Factors Affecting the Cost Estimate 13
2.3 Factor Affecting Cost Estimate in Indonesia 14
2.4 Factor Affecting Cost Estimate Considered in Other Countries 14
2.4.1 Factors for Consideration in Predicting the Accuracy of Project Cost Estimation 16
2.4.2 Previous Studies of Factors Affecting the Cost Estimate 17
2.5 Support Vector Machine 18
2.5.1 Overview of Support Vector Machine 18
2.5.2 Support Vector Machine Classification 19
2.5.3 Support Vector Machine Regression 20
2.5.4 Kernel 23
2.5.5 Previous Study of SVM Regression 24
2.6 WEKA 24
CHAPTER III: DATA COLLECTION AND ANALYSIS 27
3.1 Research Framework 27
3.2 Data Analysis 29
3.2.1 Overview Data 29
3.2.2 Project Characteristic 30
3.2.3 Complexity Project 32
3.2.4 Location Characteristic 33
3.2.5 Project Specification 35
3.2.6 Contract Information 37
3.3 Factor Analysis 38
CHAPTER IV: MODEL DEVELOPMENT 41
4.1 Model Development 41
4.1.1 Support Vector Machine Regression Model 41
4.1.2 Arranging the datasets 42
4.1.3 Setting the parameters 45
4.1.4 Examining model outcomes 46
4.1.5 Recurrence process for potential results 46
4.1.6 WEKA 46
4.2 Model Implementation and Evaluation 47
4.3 Prediction Result and Discussions 57
CHAPTER V: CONCLUSION 60
5.1 Conclusion 60
5.2 Research Recommendation 61
REFERENCES 62
APPENDIX A: DATA REQUEST PERMISSION LETTER 65
APPENDIX B: DATA 66
APPENDIX C: PARAMETER RESULT 86
APPENDIX D: MODEL RESULT 93

參考文獻

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指導教授

陳介豪(Jieh-Haur Chen)

審核日期

2016-1-26

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