# Development of Economic Evaluation System for Building Project Based on Computer Technology

Authors: Siyu Chen; Yuyang Cui; Yun Zhu; Guolin Song; Yanghua Shi
Journal: Mobile Information Systems
 (2022)

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## Abstract

In order to effectively reduce the risk of construction project (CEP) and maximize the benefit of CEP, this study establishes the construction project economic evaluation (PEE) system by using computer technologies such as transfinite learning machine, artificial intelligence algorithm, and related fuzzy neural network and compares the coupling and sensitivity of different algorithms for PEE indicators, Through the demonstration of the comprehensive efficiency of the PEE system under the condition of computer technology, The results show that the index coupling and early warning sensitivity of the project economic evaluation system using the artificial intelligence algorithm of overlimit learning machine under computer technology are better than the previous traditional algorithms, which can realize the artificial intelligence of the economic evaluation system, reduce the investment cost of the project and improve the delivery time of the project, make the best balance between the technical application and economic operation of the project, and promote the sustainable development of the construction project.


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## Body

## 1. Introduction

Construction engineering project (CEP) is due to the large amount of investment, long progress period, and easy to be affected by the environment during its implementation. In order to reduce the risk of CEP, it is necessary to study the feasibility of the construction project and carry out project economic evaluation (PEE) on the construction project, so as to reduce the potential risk of CEP investment, avoid investment mistakes, and make the social economy develop healthily and stably [1].China began to research and practice in the field of economics in the middle of last century. At that time, PEE was carried out in the design stage, so some projects had adverse reactions, such as delayed construction period, falsely high indicators, and disconnection from the design. In the 1980s, the national development and Reform Commission and the Ministry of Construction issued the economic evaluation methods and parameters of construction project enterprises, which provided unified methods and standards for various PEE methods and parameters. It effectively provides a unified method and standard for PEE methods and parameters, enabled CEP parties to effectively supervise the economic conditions such as project funds and debts, and ensured the feasibility and capital security of CEP [2].In recent years, China has made great achievements in economy, and the economic development has also given great help to the construction industry. PEE is more important to CEP [3]. Wei and Hong took the insufficient sustainability of CEP as the starting point, conducted comparative analysis and research on the sustainability injection correction of evaluation indicators from the perspective of PEE, focused on the sustainability PEE of large-scale CEP, found out the characteristics of large-scale CEP and the objectives and principles of PEE, and formed the PEE of large-scale CEP with two dimensions of quantitative evaluation and qualitative evaluation [4]. Li studied the energy-saving transformation PEE of existing residential buildings in the north, combined with theory and investigation and established an evaluation index system to help select the transformation scheme formulated before the transformation [5]. Xin and Xiaodi analyzed in detail the planning, design, construction, and use of the project in different periods by comparing and analyzing the two conventional PEEs [6]. Tiegang and Wen discussed the PEE significance of CEP, analyzed the principles of PEE, and focused on the methods of PEE, so as to improve the PEE reliability of CEP [7]. Wang Kai and Bo took a real estate project in Guiyang as an example to study green PEE. They intend to promote the development of green economy from three aspects: improving the green PEE system, promoting regional research, and establishing relevant databases [8]. The rapid economic development has also given great help to relevant industries, such as the construction industry [9].Through the combing of various studies, we have gradually found a PEE method suitable for the Chinese model. These theories and methods have contributed to economic development, but there are still some problems in the current PEE, such as the evaluation is not objective and the investigation is not in place. Liang analyzed the shortcomings of the current PEE from the PEE connotation of CEP and put forward optimization suggestions, hoping to improve the level of PEE and make the project obtain better investment benefits [9].


## 2. The Traditional Algorithm of the Economic Evaluation System of the Construction Project

PEE is an important part of the successful completion of CEP. There are generally two PEE methods: financial evaluation method (FEM) and national economic evaluation method (NEEM).


### 2.1. Financial Evaluation

FEM analyzes from the level of enterprise finance and evaluates the impact of the project on the whole enterprise finance. The profitability and solvency of the project are calculated and analyzed, and the financial feasibility of the project is judged according to the existing financial situation [10]. The financial evaluation of an enterprise starts with the analysis of the financial risk of the enterprise, evaluates the capital risk, operation risk, market risk, investment risk and other factors faced by the enterprise, so as to carry out signal monitoring and evaluation of the enterprise risk; and formulates corresponding practical and feasible long and short risk control strategies to reduce or even eliminate the risk according to its formation causes and process.


### 2.2. National Economic Evaluation

NEEM analyzes the overall level of the country, calculates the input cost and expected income of the project, and calculates and analyzes the net income of the project to the national economy to judge the economic rationality of the project [4]. NEEM is to create the most national economic benefits with limited resources and contribute to economic development.Both kinds of PEE maximize the benefit while minimizing the cost. Both need the analysis and calculation of important indicators after the establishment of product testing, site selection and equipment scheme evaluation, fund raising, and investment evaluation.The two evaluation methods differ in the following five aspects: (1) different evaluation angles. FEM focuses on corporate profitability. NEEM focuses on whether projects contribute to the national economy. (2) Cost and benefits (FAE) are different. FEM is the analysis of FAE in the financial situation of enterprises. NEEM is the consumption of national resources, whether it can provide effective products and services for the society. (3) The scope of expenses and benefits is different. FEM only considers direct FAE. NEEM also indirectly lists FAE as analysis data. (4) The benchmark price of FAE is different. FEM is based on market price and uses industry benchmark yield. NEEM is based on social discount rate. (5) The role of evaluation is different. FEM affects the local interests of enterprises; NEEM affects the overall interests of the country and society.On the basis of combining NEEM, CEP adopts FEM to estimate the investment estimation, total project investment estimation, and investment use plan, analyze the source and application of funds, and analyze the sales profit. From a financial perspective, FEM of the project profitability, loan repayment ability, project risk, etc. is needed.Due to the complex calculation value of PEE, with the popularization of computer technology, the PEE of CEP gradually changes from manual calculation to computer calculation, mainly using the weighted index method (WIM). WIM generally selects various indexes for evaluation and collects the number of indexes, then scores each index according to the standard, and finally weights and integrates the results of various indexes. The principle of weighted integration is to set a certain weight coefficient for each output result, multiply the corresponding output value by the weight coefficient, and then accumulate to form the final output result. The basis function of the algorithm is shown in(1)f=∑n=1nφnyn,where f is the weighted statistical result, φn is the weight coefficient of the nth output value, yn is the nth output value, and n is the total number of output values.Although WLM has the advantages of easy and easy, it also has three obvious disadvantages. First, it cannot distinguish the different properties of the index, resulting in the comprehensive index being not scientific enough. Some indicators in PEE are state indicators, not to judge the size, but the closer to the standard level, the better, and WLM is prone to mistakes in this respect. Second, it can not dynamically reflect the development and changes of the project. The project has different changes in different periods, and the WLM investigation time is relatively short, which can not well judge the development trend of the project. Third, it ignores the weight action interval. The complete interval of the weight action is between the highest value and the lowest value rather than the average value, and the WLM takes the average value, which causes the evaluation error.Only by using scientific methods to reasonably analyze the system and quantitative, and then using engineering technology, to calculate the funds and expected income invested by CEP, can the funds play the maximum effect.


## 2.1. Financial Evaluation

FEM analyzes from the level of enterprise finance and evaluates the impact of the project on the whole enterprise finance. The profitability and solvency of the project are calculated and analyzed, and the financial feasibility of the project is judged according to the existing financial situation [10]. The financial evaluation of an enterprise starts with the analysis of the financial risk of the enterprise, evaluates the capital risk, operation risk, market risk, investment risk and other factors faced by the enterprise, so as to carry out signal monitoring and evaluation of the enterprise risk; and formulates corresponding practical and feasible long and short risk control strategies to reduce or even eliminate the risk according to its formation causes and process.


## 2.2. National Economic Evaluation

NEEM analyzes the overall level of the country, calculates the input cost and expected income of the project, and calculates and analyzes the net income of the project to the national economy to judge the economic rationality of the project [4]. NEEM is to create the most national economic benefits with limited resources and contribute to economic development.Both kinds of PEE maximize the benefit while minimizing the cost. Both need the analysis and calculation of important indicators after the establishment of product testing, site selection and equipment scheme evaluation, fund raising, and investment evaluation.The two evaluation methods differ in the following five aspects: (1) different evaluation angles. FEM focuses on corporate profitability. NEEM focuses on whether projects contribute to the national economy. (2) Cost and benefits (FAE) are different. FEM is the analysis of FAE in the financial situation of enterprises. NEEM is the consumption of national resources, whether it can provide effective products and services for the society. (3) The scope of expenses and benefits is different. FEM only considers direct FAE. NEEM also indirectly lists FAE as analysis data. (4) The benchmark price of FAE is different. FEM is based on market price and uses industry benchmark yield. NEEM is based on social discount rate. (5) The role of evaluation is different. FEM affects the local interests of enterprises; NEEM affects the overall interests of the country and society.On the basis of combining NEEM, CEP adopts FEM to estimate the investment estimation, total project investment estimation, and investment use plan, analyze the source and application of funds, and analyze the sales profit. From a financial perspective, FEM of the project profitability, loan repayment ability, project risk, etc. is needed.Due to the complex calculation value of PEE, with the popularization of computer technology, the PEE of CEP gradually changes from manual calculation to computer calculation, mainly using the weighted index method (WIM). WIM generally selects various indexes for evaluation and collects the number of indexes, then scores each index according to the standard, and finally weights and integrates the results of various indexes. The principle of weighted integration is to set a certain weight coefficient for each output result, multiply the corresponding output value by the weight coefficient, and then accumulate to form the final output result. The basis function of the algorithm is shown in(1)f=∑n=1nφnyn,where f is the weighted statistical result, φn is the weight coefficient of the nth output value, yn is the nth output value, and n is the total number of output values.Although WLM has the advantages of easy and easy, it also has three obvious disadvantages. First, it cannot distinguish the different properties of the index, resulting in the comprehensive index being not scientific enough. Some indicators in PEE are state indicators, not to judge the size, but the closer to the standard level, the better, and WLM is prone to mistakes in this respect. Second, it can not dynamically reflect the development and changes of the project. The project has different changes in different periods, and the WLM investigation time is relatively short, which can not well judge the development trend of the project. Third, it ignores the weight action interval. The complete interval of the weight action is between the highest value and the lowest value rather than the average value, and the WLM takes the average value, which causes the evaluation error.Only by using scientific methods to reasonably analyze the system and quantitative, and then using engineering technology, to calculate the funds and expected income invested by CEP, can the funds play the maximum effect.


## 3. Artificial Intelligence Algorithm Based on Computer Technology

Artificial intelligence of computer technology is the intelligent behavior of simulating human-related thinking process through a computer. The research in this intelligent field mainly includes intelligent robot, intelligent language recognition, intelligent image recognition, and intelligent computing processing. The artificial intelligence algorithm of computer technology can simulate the feedback process of human consciousness, vision, and thinking. The role of artificial intelligence technology will be a container of human intelligence in the future, enabling artificial intelligence systems applying computer technology to think like human beings, and may even surpass human intelligence.The PEE of CEP analyzes the financial benefits of the construction project based on the information data of financial prediction, such as the profitability and repayment ability of the construction project, so as to judge the economic feasibility of the construction project and the necessary economic and technical indicators of the project. In order to evaluate the relevant indicators of CEP economy more intelligently, the computer intelligent technology is adopted in the PEE system. Because the limit learning machine (ELM) in artificial intelligence algorithm does not have the advantages of strong intelligence and fast learning speed, computer technology can be used to analyze the economic evaluation system of construction projects.Analysis of overlimit learning machine of related CEP economic indicators is shown in Figure1.Figure 1
Analysis of the overlimit learning machine for the economic indicators of the construction project.In Figure1, time series data refers to the data of time series, which is also a series of relevant data indexed by time dimension. Each data in the same data column is required to have the same caliber and comparability. Transfinite learning machine is a machine learning system or method based on feedforward neural network, which is suitable for supervised learning and unsupervised learning of artificial intelligence. According to the time sequence diagram of the project and the time sequence diagram of the project delivery, the output of the project is obtained according to the time sequence diagram of the project. After sorting the difference sequence of the time series data of the project, the evaluation index results of the project can be obtained through the intelligent algorithm of transfinite learning machine.ELM algorithm can make up for the deficiency of the Fourier transform algorithm and thus effectively improve the computing efficiency of artificial intelligence identification. The above calculation formula is as follows.The function formula of the Fourier transform is shown in(2)Fω=∫−∞+∞A∙ft−ie∙2πdt,where t is the traversal pointer of timing sequence, ω is the traversal pointer to the frequency variable, A is the detection accuracy correction variable, Fω is the output function of Fourier transform, ft is the input function of Fourier transform, and −ie∙2π is the Fourier constant, where e is the natural constant and π is the circumference rate.The difference sequence function formula is shown in(3)∆X1,∆X2,⋯,∆Xn−1=X2−X1X1,X3−X2X2,⋯,Xn−Xn−1Xn−1,where ∆Xn is the nth value of the difference sequence and Xn is the nth value of the original sequence.We enter the difference series of formula (2) into the overlimit learning machine to get
(4)y=∑i=1nA∙sinBxi+C+D,where i is equivalent to the pointer variable; n is the number of nodes of the neural network in the previous layer; A, B, C, and D are regressors; and xi is the ith variable input from the neural network in the previous layer.We build project economic evaluation data after different algorithms, in the depth of data mining and fusion application, using a fuzzy neural network (FNN) system early warning response analysis. Fuzzy neural network is the product of the combination of fuzzy theory and neural network. It integrates the advantages of neural network and fuzzy theory and integrates learning, association, recognition, and information processing. The fuzzy neural network processing module consists of fuzzification, fuzzy reasoning, defuzzification, and learning rule base. Module data main characteristics of intelligent system evaluation, project data depth mining, and FNN analysis are shown in Figure2.Figure 2
Fuzzy neural network analysis of the project economic evaluation system.In Figure2, the budget data, budget data, and feature matrix information data of the economic evaluation index of the construction project can be normalized and output the AI evaluation results of Fourier transform algorithm by FNN calculation, while the economic evaluation index calculated by ELM can be directly normalized to the AI evaluation results of the algorithm by fuzzy neural network analysis.The basis function of the matrix normalization (Z score) algorithm used above is described as
(5)ZScorei=xi−μσ,μ=1n∑i=1nxi,σ=1n−1∑i=1nxi−μ2,where μ is the arithmetic average of the input sequence x and σ is the standard deviation rate of the input sequence x.The results of the normalization function algorithm are shown in(6)yi=xi−minxmaxx−minx,where xi is the ith input item in input sequence x, yi is the output item corresponding to the ith input item, minx is the minimum value in input sequence x, and maxx is the maximum value in input sequence x.The sixth-order polynomial depth iteration function of the fuzzy neural network can control the recent change law of timing data and the minimum node amount of modules to realize the fuzzy convolution of data. The function expression formula is shown in(7)y=∑i=1n∑j=05Ajxij,where Aj is the coefficient to be regression of the polynomial of order j and j is the polynomial order.Because the construction project has a single and changeable nature, it requires the economic evaluation system of the project to be more accurate and complete in the relevant index data collection system, control system, and the analysis system of process ability in the management of the database.For the PEE system under the condition of computer technology, the evaluation system is not unique, in the use of PEE system to analyze the economic benefits of the relevant scheme, other factors of the project. In this case, it is necessary to have a reasonable scientific choice of a project economic evaluation method, the evaluation method should not only build the technical and economic evaluation as a benchmark but also consider the comprehensive evaluation index of the project, in reducing the project investment and capital consumption at the same time, seeking more economic benefits to the project. In order to get a better result of construction project economic evaluation, we randomly selected a city construction of 30 construction project average group as economic evaluation analysis object to verify the effectiveness of the system, first of all, under the condition of computer technology construction project economic evaluation index of different algorithm coupling degree, such as Table1:Table 1
Comparison of the coupling degree of the project economic evaluation indexes.
Grouping
n
Before coupling
After coupling
Traditional algorithm for the PEE system
15
34.8
±
3.5
57.5
±
2.1
Artificial intelligence algorithm for the PEE system
15
37.2
±
3.9
50.8
±
1.6
t value
8.347
7.683
P value
0.006
0.007Table1 shows the PEE system of traditional algorithm and computer technology of coupling degree data comparison, using the computer technology of artificial intelligence algorithm and coupling data of economic evaluation system is significantly higher than the traditional algorithm of economic evaluation system, and the two groups of compare object data difference t<10.000,P<0.05 has obvious statistical significance.In order to more intuitively evaluate the energy efficiency of the economic indicators of building projects, the coupled comparison data of different algorithms are visualized, resulting in Figure3.Figure 3
Visual diagram of the comparative coupling degree of the project economic evaluation index.Figure3 shows the two sets of analysis object of project economic evaluation index coupling contrast visualization, intuitively shows the computer technology of artificial intelligence algorithm economic evaluation system coupling effect is better, indirectly illustrates the application of the artificial intelligence algorithm, is conducive to the coupling development of construction project economic evaluation system, can promote the system of big data analysis, and improves the efficiency of the evaluation system data management.


### 3.1. Comparison of Early Warning Sensitivity

In a PEE system after different algorithm data coupling results, through the FNN module on the basis of high sensitivity data acquisition, to early warning sensitivity analysis of the PEE system, early warning sensitivity analysis should not only focus on project economic indicators but also need to consider the comprehensive consideration of the project evaluation and related factors affecting various evaluation system. The early warning sensitivity analysis for the PEE system of the CEP is shown in Table2.Table 2
Comparison of the early warning sensitivity of the project economic evaluation system.
Grouping
n
Warning sensitivity
Before use
Before use
Traditional algorithm for the PEE system
15
94.9
±
5.8
95.3
±
4.3
Artificial intelligence algorithm for the PEE system
15
95.4
±
5.3
97.8
±
2.1
t value
6.894
7.645
P value
0.007
0.008In order to better reflect the data prediction sensitivity of the construction project economic evaluation system, the data comparison results in Table2 are visualized and result in Figure 4.Figure 4
Visualization of early warning sensitivity of the project economic evaluation system.Table2 and Figure 4 show the two groups of analysis object of project economic evaluation system warning sensitivity results; the results show that using project computer technology of artificial intelligence algorithm economic evaluation system is better than the traditional economic evaluation system; artificial intelligence algorithm economic evaluation system warning data sensitivity is higher, can have better early warning ability, and is beneficial to improve the intelligent application of economic evaluation system.


## 3.1. Comparison of Early Warning Sensitivity

In a PEE system after different algorithm data coupling results, through the FNN module on the basis of high sensitivity data acquisition, to early warning sensitivity analysis of the PEE system, early warning sensitivity analysis should not only focus on project economic indicators but also need to consider the comprehensive consideration of the project evaluation and related factors affecting various evaluation system. The early warning sensitivity analysis for the PEE system of the CEP is shown in Table2.Table 2
Comparison of the early warning sensitivity of the project economic evaluation system.
Grouping
n
Warning sensitivity
Before use
Before use
Traditional algorithm for the PEE system
15
94.9
±
5.8
95.3
±
4.3
Artificial intelligence algorithm for the PEE system
15
95.4
±
5.3
97.8
±
2.1
t value
6.894
7.645
P value
0.007
0.008In order to better reflect the data prediction sensitivity of the construction project economic evaluation system, the data comparison results in Table2 are visualized and result in Figure 4.Figure 4
Visualization of early warning sensitivity of the project economic evaluation system.Table2 and Figure 4 show the two groups of analysis object of project economic evaluation system warning sensitivity results; the results show that using project computer technology of artificial intelligence algorithm economic evaluation system is better than the traditional economic evaluation system; artificial intelligence algorithm economic evaluation system warning data sensitivity is higher, can have better early warning ability, and is beneficial to improve the intelligent application of economic evaluation system.


## 4. Development Direction and Development Suggestions of the Economic Evaluation Work of Construction Projects

Under the condition of computer technology of PEE index for different algorithms of coupling and sensitivity comparison, the results show that the artificial intelligence algorithm of PEE system coupling data is significantly higher than the traditional algorithm, illustrates the application of the artificial intelligence algorithm, is conducive to the coupling development of PEE system, can promote the system of big data analysis, and improves the efficiency of the evaluation system data management.PEE has been reflected in the whole process of CEP. As an important part of the project feasibility study, it ensures the maximum benefit of CEP, provides a decision-making basis for CEP, reduces project loss, reduces investment risk, and improves investment income.


## 5. Summary

With the continuous optimization and development of CEP computer technology application, the complexity and comprehensiveness of the project have been greatly improved. The scientific knowledge involved is also more extensive. Therefore, in the economic evaluation of the project, we need to consider a series of relevant factors and choose an evaluation system with higher comprehensive cost performance. This research is based on the basis of intelligent computer technology, using the ELM AI algorithm and related FNN analysis. To prove the comprehensive efficiency of the construction project economic system under the computer technology conditions, the empirical results show that the PEE system index coupling degree and early warning sensitivity of ELM AI algorithm are better than the previous traditional algorithm economic evaluation system, To realize the artificial intelligence of the economic evaluation system, it can reduce the investment cost of the project and effectively improve the delivery time of the project. To achieve the best balance between the technical application and economic operation of the project, promoting the sustainable development of construction projects is done.



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