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Application of Neural Network in the Cost Estimation of Highway Engineering 1762 JOURNAL OF COMPUTERS, VOL. 5, NO. 11, NOVEMBER 2010 Application of Neural Network in the Cost Estimation of Highway Engineering WANG Xin-Zheng School of Civil Engineering,Nanyang Normal University ,Nanyang city P.R.China, 473061 [email protected] DUAN Xiao-chen and LIU Jing-yan School of Economics and Management,Shijiazhuang Railway InstituteShijiazhuang city,P.R.China,050043 [email protected] Abstract—Based on the BP neural network, this paper sets up the model of cost estimation of highway engineering. The BP neural network model is trained by a sample data II. METHODOLOGY OF NEURAL NETWORK obtained from some performed typical engineering to come The neural network is a new method of information true quick cost-estimating．It is sure that the method is practical and the estimating results are reliable according processing[3]. It is the complex network system that is ． formed by many plentiful and simple processing units to lots of examples It shows the promising perspective of [4] BP Neural Network in cost estimate of construction (neurons) . The neural network is one kind of engineering. large-scale parallel connection mechanism with adaptive modeling function, which simulates the structure of Index Terms -neural network, highway engineering, cost human brain[5]. Its establishment is on the basis of estimation modern neuroscience research. In many kinds of neural network models, the back-propagation neural network I. INTRODUCTION model (i.e. BP network model) is the most popular The cost estimation of the project is an important network because of its better functions of self-study and content of the feasibility Study. The accuracy of the cost self-association. The standard BP network is composed of three kinds of neurons layer. The lowest layer is called estimation directly affects the project’s decision, [6] construction’s scale, design scheme, economical effects, the input layer. The middle one is named as the hidden and project’s proceeding. Estimating the project handily, layer (can be multi- layer). And the top one is called the quickly and exactly has the great significance for the output layer. Every layer of neurons forms management and control of the project’s estimation[1]. fully-connection, and the neurons in each layer have no The main characteristic of the project’s cost estimation connection. The learning course of BP algorithm is is that there are too many factors that can affect the composed of two processes ， propagation and fabrication cost of the project, but little available related antipropagation. In the propagation course, the input material[2]. The fabrication cost is affected by not only information is transferred and processed through input [7] the construction’s characteristic, but also many uncertain layer and hidden layer . The state of every neural unit factors. And there is highly nonlinear mapping layer only affects the state of next layer. If the expected relationship between the project’s fabrication cost and information cannot be got in the output layer, the course the uncertain engineering characteristics. Therefore, how will turn into the antipropagation and return the error to reflect this mapping relationship is the key of setting signal along the former connection path. Via altering the up the estimation model. The relationship between these value of concatenation weight between each stratum, the two ones is linearity in the traditional estimating methods error signal is transmitted orderly into the input layer, (such as regression analysis), which would reduce the and then be sent into the propagation course. The precision and accuracy of the results. If the theory of repeated application of these two courses makes the error neural network is introduced in the traditional method more and much smaller, until it meets the requirements. (Engineering comparison), it can remedy the shortage by The specific structure is as shown in figure 1: the training process and make the evaluation more dependable and quicker. © 2010 ACADEMY PUBLISHER doi:10.4304/jcp.5.11.1762-1766 JOURNAL OF COMPUTERS, VOL. 5, NO. 11, NOVEMBER 2010 1763 Error back-propagation - + Desired m m output mm m input layer Output layer hidden layer figuar1. Schematic representation the basic structure of BP neural network In this figure, the relationship between the input and can get the estimation of the project’s investment by output of neural unit (except the input layer) is nonlinear inputting the features of the planned construction mapping, and S (Sigmoid) function is always be adopted projects and some related price materials into neural f (x) = 1 (1+ e −x ) network. This paper makes the estimation of highway to reflect it. is the Expression of project’s investment as the example and sets up an output node function, and the differential coefficient is estimation model of BP neural network by collecting the ' data of highway projects in some area that have been f (x) = f (x)(1− f (x)) .Its advantage is that the completed between 2000 and 2002 the data of sixteen input data of any form can be transformed into the typical projects were selected as training samples, （ ， ） numbers that are in 0 +1 . thereinto the data of fifteenth and sixteenth are applied for checking.The estimation model that is based on III. APPLICATION OF NEURAL NETWORK IN THE neural network is expressed in figure two. The model can ESTIMATION OF PROJECT’S INVESTMENT be divided into three sections: input-preprocessing The basic principle of the estimation and analysis of module, neural network module, and output-processing project’s investment is that its establishment should be module. Neural network module is the nuclear module on the base of the similarity of projects. For planned input-preprocessing neural network output-processing construction projects waiting for estimation, firstly, we module module module start with the analysis of the construction’s type and the project’s feature, and find some projects that are the figureI. cost estimation model based on neural network similar ones like the planned construction projects in The task of input-preprocessing module is to many other projects that have been completed. Then the preprocess the input data by changing qualitative stuff fabrication cost materials of these similar projects can be into quantitative ones so as to make the calculation of used as the original data to make the illation. At last, get neural network convenient the output-processing module the investment estimation and any other related data of can change the output of neural network into the data of the planned construction projects. When we use neural estimation that we need. network to estimate the investment of project ,we should A. quantitative description of engineering analyze and settle the existing estimation materials, characteristics analysis materials and features of the former typical projects in the light of the definite formats, and make Engineering characteristics is the important factor that them as the training samples in order to input them into can express the project’s characteristic and can reflect neural network to be trained, then finish the mapping the main constitution of the project’s cost. The selection from input layer (features of project) to output layer of the project’s feature should refer to the statistics of (estimation material). This mapping is set up on the base historical projects’ materials and expert's experience. of the simple nonlinear functions and expresses t Firstly, analyze the effect the typical highway project complex phenomenon of project’s investment estimation. cost and the change of construction’s parameter make to The neural network model automatically extracts the the estimation of the project’s investment. we confirm information and stores it as network weight in the inside nine main factors including landform, highway grade, of neural network. In this way, engineers and technicians cross-section type (cutting, Embankment, half-digging and half-filling), height, width, foundation treatment type, © 2010 ACADEMY PUBLISHER 1764 JOURNAL OF COMPUTERS, VOL. 5, NO. 11, NOVEMBER 2010 material and thickness of the road surface, guard project compositor of the cost change and assigns corresponding type and so on as the project’s features. And then List the quantification data subjectively, shown in table 1. characteristics of different engineering categories, each kilometer highway engineering construction cost change by reason of construction cost influence's relevance according to quota and the project characteristic, make TABLE I. QUANTIFICATION DATA OF CHARACTERISTICS OF ENGINEERING CATEGORIES quantitative value 1 2 3 landform maintain area hill plain half-digging and type of foundation’s cross-section cutting embankment half-filling highway grade high speed rank 1 rank 2 height of foundation’s 0~0.5 0.5~1 1~1.5 cross-section/m width of foundation’s 0~10 10~15 15~20 cross-section/m type of foundation Ordinary replacement plastic drain board consolidation geogrid material of road surface’s asphalt concrete cement concrete structure guard project common guard anchor plates slope-protecting gravity retaining wall thickness of road surface’s 0~0.2 0.2~0.3 0.3~0.4 structure/m quantitative value 4 5 6 landform the type of foundation’s cutting 、half-digging and embankment、half-digging cutting 、embankment cross-section half-filling and half-filling highway grade rank 3 the height of foundation’s 1.5~2 2~2.5 more than 2.5 cross-section/m the width of foundation’s 20~25 25~30 more than 30 cross-section/m sand pile drain the type of foundation dynamic compaction,mixing pile geotextile consolidation the material of road surface’s structure guard project shotcrete wire support board girder support vegetation support the thickness of road surface’s 0.4~0.5 0.5~0.6 more than 0.6 structure/m According to table 1, any highway project model can according to the proportion can be used as its be given a quantitative description.
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