On the construction industry project cost control system design and implementation of

[Abstract] The control system combines the ideas and methods of software engineering, analysis and design of the construction industry cost control system, the use of network and database Technology, will link together a number of departments of Information, mutual sharing, mutual restraint, effective solution construction cost of the construction industry out of control in the passive situation.

[Keywords] cost control, Cost Management

1 Introduction
Construction cost control is the occurrence of the construction cost control within the approved cost limit, at any time to correct the deviation occurs, to ensure that the project management goals, in order to be in various construction projects in the rational use of manpower, material and financial resources, achieve better Investment returns and social benefits. Construction cost, including construction equipment Information, construction materials, Information, construction and installation Information, and other Investment Information project, related to equipment, materials, design, budget, engineering and other departments do not have a reasonable cost control system, the entire construction cost face the risk of loss of control [1].

2 construction industry project cost control systems architecture selection
2.1 B / S architecture
B / S structure (Browser / Server structure structure structure that the browser and the server it is with the rise of Internet Technology, the C / S structure, the structure of a change or improvement in this structure, the user interface is working achieved through a WWW browser, very small part of the business logic in the front (Browser to achieve, but the main business logic on the server side (Server to achieve the formation of the so-called three-tier 3-tier structure. This greatly simplifies the client computer loads, reducing the system maintenance and upgrade costs and the workload and reduce the overall cost of the user (TCO. look at the current Technology, the establishment of LAN B / S structure of the network applications, and through Internet / Intranet mode, database applications, is relatively easy to grasp, the cost is low and it is one place the development, to achieve different people from different locations, different access methods (such as LAN, WAN, Internet / Intranet access and manipulate such a common database, it can effectively platform data protection and management of access to the database server is also very safe, especially in the JAVA language, so the advent of cross-platform, B / S architecture management software is easy, fast, excellent results.

B / S structure with the distribution of characteristics that can be queried at any time, browsing and other business processes, business expansion is simple and convenient, can be increased by increasing the web server functionality, easy to maintain, only need to change the page, you can achieve synchronization of all users update, the development of simple, sharing, and other advantages. B / S mode, the disadvantage of significantly lower personal characteristics, can not be achieved with individual functional requirements, the operation is based on the mouse as a basic mode of operation, can not meet the requirements of rapid action , dynamic page refresh, the response rate was significantly lower functions have weakened, it is difficult to achieve under the traditional model of special functional requirements.

2.2 C / S structure
It is the software system architecture, which allows full use of both ends of the advantages of the hardware environment, the rational allocation of tasks to the Client side and Server side to achieve, reducing the system's communication overhead. Most software systems are Client / Server in the form of a two-tier structure, due to the current software applications are distributed to Web application development, Web and Client / Server applications can perform the same business process, application of different modules share the logical components, therefore, internal and external Users can access the new and existing application systems, through the existing application system logic can be extended to new applications, which also is the current application system development.

C / S structure has the advantage of lighter application server running the data load and data storage management more transparent. The disadvantage is the high maintenance costs and large Investment. First, the use of C / S architecture, the database to select the appropriate platform to achieve database data real "unity" so that the distribution of data synchronization in the two completely by the database system to manage, but the two logical operator to directly access the same database in order to effectively implement the network management staff both on the server maintenance and management, but also maintenance and management of the client, which requires high Investment and complex technical support, maintenance cost is high, large amount of maintenance tasks.

3 for the detailed design
The second part of the text-based system architecture analysis of advantages and disadvantages, this design uses a C / S structure. C / S architecture by the client application, namely the client and database server, also referred to as server program composed of two parts, Clients can also be generally referred to as the foreground program, interaction with the user to complete the task, and the server daemon can be called, is responsible for data management when the client application to send the work request, the server program is initiated, the response and feedback. client program running on the client, the general is the user's computer, corresponding to the server computer, when the need for access to data in the database operation, the client will automatically find the appropriate server program to its request, the server process can make a response in accordance with predetermined rules, the results fed back [1]. Links to free download http://www.hi138.com
Construction industry project cost in accordance with the functional requirements, cost control system can be divided into the following modules: user management module, project information module, material management module, the device management module, management module prices, project Cost Management module, and quota management module system The structure is as follows:

Figure 1 construction industry project cost control system structure
3.1 User Management Module
The main function of the user management module, including user information and save, modify user information, user information, delete, query the user's information and query the user's situation.

3.2 Project Information Management Module
Create a new project, you can project name, number, project information and other settings. Specifically includes the name of the new construction, construction, the building area, area, building indicators described.

3.3 Materials Management Module
This module's main function is to achieve the management of raw material prices, fluctuation of prices is supply and demand with the market, the national macro-control policy to change, the purpose is to provide data for the project cost model.

Price Management Module 3.4
The main function is the daily cost of the project for the preparation, including construction workers, operating machinery, materials, budget price.

3.5 quota management module
Construction of the main function of the fixed performance management module for the preparation of new or modified to adjust the original work, material consumption, Jixietaiban fixed costs, or use them in the preparation of new construction fixed. Is the set of the fixed adjustment programs on the basis of automatically determine their own consumption indicators, the user control to achieve a fixed adjustment costs of fixed management fees and rates is reflected in the setting and adjustment, the user should be based on their own needs within the allowable range of adjustment costs to modify its rates [1].

3.6 Device management module
Access to the equipment, usage, manage to stop the situation of repair, according to market conditions the price of real-time refresh equipment, establish the appropriate database to facilitate contact with other subsystems.

3.7 Project Cost Management
Project cost control module can be divided into the following four systems:
3.7.1 Investment decision-making system
Main job is to prepare project proposals, feasibility studies, and ultimately the formation of the feasibility study report,
3.7.2 Design Control System
The system design phase is to determine the cost and control, through the respective cost of the proposed project and budget cost estimates for analysis and planning, down to its work in various fields, respectively, in order to limit the preliminary design and construction design, designed to limit the purpose of
3.7.3 bidding system
Should include tender management and bid management two sub-systems, primarily reflecting the Party's tender management, B bid management, and evaluation of Party A, Party B enter into construction contracts and other information processing,
3.7.4 Construction Control System
Construction of control system is the key to cost control, project implementation needs of both parties to work together to complete, and A and B sides of their respective positions, the task is different, it is necessary to control the construction is divided into "Party System" and "B system";
Party system should include: 1) the use of funds plan preparation, program management funds, 2) engineering change control, implementation of engineering change management, 3) control the progress, quality, review of project settlement, 4) preparation of project completion and acceptance plan preparation of completion accounts, 5) construction cost data collation has been completed and submitted to the management information system, the quota management system for analysis, preparation of new estimates and estimates of indicators, the price management system by the control system to keep the history of engineering data similar to the preparation of new construction cost index, and the price forecast analysis.

B system should include: 1) construction design and management, 2) cost, quality, schedule control, 3) the preparation of claims management and settlement, etc. [1].

4 Summary
Project cost control system to regulate development of the company management and control of project cost, improve efficiency, save project costs, project Cost Management to enhance the level and quality.

References
[1] Marvin Green. Construction project cost control system design and implementation of [D]. University of Electronic Science and Technology, 2009.

[2] Wu is established, von accounting red. Project cost control and management. Wuhan: Wuhan University Press, 2004. Links to free download http://www.hi138.com