KR101529679B1 - Integrated co2-cost-schedule management system and method for building construction projects using the earned value management theory - Google Patents
Integrated co2-cost-schedule management system and method for building construction projects using the earned value management theory Download PDFInfo
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The carbon dioxide-cost-schedule integrated management system of the construction project of the present invention includes a project schedule generation unit for generating a project schedule based on information related to the post-processing relationship and work time of each management account by referring to the management accounts, A construction cost calculation unit for calculating the construction cost required for the construction process, a carbon dioxide emission calculation unit for calculating the carbon dioxide emission amount generated in the construction process for each control account, and a performance curve measuring plan for each management account based on the project schedule The baseline generator and each management account are used to calculate construction schedule weights, CO2 emission weights, and cost weights. We calculate the integrated weights of CO2 emissions based on the construction schedule weights and the CO2 emission weights for each management account. Weighted A weighted calculation unit for calculating a cost schedule integrated weight on the basis of the calculated plan weight, the measurement elements for each management account, calculating the weighted performance value, calculating at least a weighted weighted value based on the calculated planned value, And a performance analysis unit for deriving analysis factors including a schedule performance index and a weighted cost performance index.
Description
The present invention relates to a construction project management methodology, and more particularly, to a cost-schedule integrated management system.
The United Nations Framework Convention on Climate Change was concluded to prevent global warming by limiting global greenhouse gas emissions, and the Kyoto Protocol was initiated by the Third Conference of the Parties in 1997.
By 2020, the Korean government has set a national target of 30% reduction from its GHG emissions estimate. Recently, the Korean National Assembly passed the "Law on the Allocation and Transactions of GHG Emissions Rights (2013.3)" and the "GHG Emissions Trading Scheme" will be implemented from 2015. This global trend is also expanding in the construction industry. In the Republic of Korea, a significant portion of the total fossil fuel is consumed in the construction industry sector.
On the other hand, the composition ratio of CO2 emissions by building life cycle stages was 22.7% in the construction phase and 71.7% in the operation phase. Considering the life cycle stages, the density of CO2 emissions during the construction phase is very high compared to the operational phase.
Under this background, a variety of techniques have been developed to evaluate the carbon dioxide emissions of the construction phase. In order to calculate the carbon dioxide emissions during the lifecycle of a building, the entire process assessment technique was used in accordance with the criteria set out by the International standard organization / technical committee 207 (ISO / TC 207).
Specifically, a number of technologies have been developed to evaluate carbon dioxide emissions from structures, planes, and construction methods of buildings. Second, during the construction phase of the building, a number of technologies were developed to evaluate CO2 emissions according to the type of transportation equipment and site construction equipment. Third, technology was developed to estimate the amount of CO2 emissions from the construction phase of the building.
However, such a technique remains at a collective level of calculation for a particular point in time or for the entire construction, making it difficult to evaluate and predict CO2 emissions according to the construction schedule in the construction phase. Therefore, in order to plan, monitor, evaluate, and forecast CO2 emissions according to the construction schedule, it is necessary to consider the schedule of construction to the developed system.
A problem to be solved by the present invention is to provide a carbon dioxide-cost-schedule integrated management system and method in a building construction project.
The problem to be solved by the present invention is to construct a system for planning, monitoring, evaluating and predicting the project performance according to the construction schedule, using the theory of performance management technique.
A problem to be solved by the present invention is to construct a management account based on a site classification system and to construct a system that can be utilized in a construction site by converting it into a database.
A problem to be solved by the present invention is to construct a system capable of estimating the integrated progress rate through application of the weight in terms of carbon dioxide emission, cost, construction schedule, and each viewpoint.
A problem to be solved by the present invention is to implement a system having a user friendly interface so that a final decision maker can intuitively determine the current status of carbon dioxide emission amount and construction cost according to a construction schedule.
The solution to the problem of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.
As a carbon dioxide-cost-schedule integrated management system according to an aspect of the present invention,
A project DB that stores management accounts for construction projects and stores construction cost data and CO2 emission data for each operation at each construction stage linked to the work of constructing each management account;
A project schedule generation unit for generating a project schedule based on information related to a posterior relationship and an operation time of each of the management accounts with reference to the management accounts;
A construction cost calculation unit for calculating a construction cost required in the construction process for each of the management accounts;
A carbon dioxide emission calculation unit for calculating a carbon dioxide emission amount caused in the construction process for each of the management accounts;
A performance measurement reference line generation unit for constructing a schedule curve for each management account based on the project schedule;
The schedule schedule weight, the CO2 emission weight, and the cost weight are calculated for each administrative account and the schedule delay of each management account affects the delay of the entire schedule, the potential increase of the CO2 emission amount and the potential increase of the construction cost, A weight calculation unit for calculating the integrated weight of carbon dioxide emission based on the construction schedule weight and the weight of the CO2 emission weight for each management account, and calculating the cost schedule integrated weight based on the construction schedule weight and the cost weight;
Measuring elements including the planned value, the actual value, and the execution value for each of the management accounts; calculating a weighted performance value reflecting the combined carbon dioxide emission schedule weight and the cost schedule integrated weight on the performance value; , A performance analyzer that derives, based on the weighted performance values and execution values, at least analytic elements including a weighted constant performance index and a weighted cost performance index.
According to one embodiment, the performance analysis unit may be operable to calculate a weighted completion time prediction value based on the derived measurement factors and analysis factors.
According to one embodiment, the carbon dioxide-cost-schedule integrated management system comprises:
And an interface module for receiving data from a user for the setting of the management account and the volume allocation setting, or for providing an interface for displaying the calculated weighted schedule performance index or weighted cost performance index to the user.
According to one embodiment,
The construction cost data includes data of direct material cost, indirect material cost, direct labor cost, and indirect labor cost according to job attributes for each job,
The carbon dioxide emission amount data may include data on the carbon dioxide emission amount generated during the material production step, the material transportation step, and the site construction step according to the construction process for each work.
According to one embodiment,
The construction schedule weight is a ratio of the operation time to the sum of the operation time and the total free time of each management account,
(Where A Di is the job density ratio of the ith administrative account, D i is the work time of the i th administrative account, TF i is the total free time of the i th administrative account)
The ratio of the work density of each management account to the sum of the total work density ratios based on the job density ratios of the management accounts defined as follows:
(Where W Si is the construction schedule weight of the i-th management account and A Di is the job density ratio of the i-th management account).
According to one embodiment,
The carbon dioxide emission weight is a ratio of the carbon dioxide emission of each management account to the total project carbon dioxide emission,
(Where W CO2i is the carbon dioxide emission weight of the i-th managed account, CO 2i is the carbon dioxide emission of the i-th managed account)
Can be calculated as follows.
According to one embodiment,
The cost weight is a ratio of the budget of each management account to the budget of the entire project,
(Where W Ci is the cost weight of the ith managed account and C i is the construction cost of the ith managed account)
Can be calculated as follows.
According to one embodiment,
The carbon dioxide emission scheduling integrated weight is calculated by integrating the weight of the construction schedule and the carbon dioxide emission weight for each management account,
(Where RW CO2i is the integrated weighted ratio of CO2 emissions for the i-th management account, and ICO2i is the integrated weight for the i-th management account)
Lt; / RTI >
The cost schedule integration weight is calculated by integrating the schedule weight and the cost weight for each management account,
(Where RW Ci is the cost schedule unified weighting ratio of the ith managed account and W ICi is the integrated cost weighting of the ith managed account)
As shown in FIG.
According to one embodiment,
The weighted performance value is calculated by the following equation
(Here, W_BCO 2 WP i have i weighted carbon emissions performance worthy of the second administrative account, B CO2 AC is the time of completion of project carbon dioxide emissions, W ICO2i is i carbon dioxide emissions constant consolidation weights of the second administrative account, Q Ai is the i-th management accounts Q Pi is the planned amount of the i-th management account)
The weighted carbon dioxide emission amount calculated by the performance value,
The following equation
(Where W_BCWP i is the weighted cost performance value of the i th management account, B cost AC is the completion planning cost, W ICi is the integrated cost weighting of the i th management account, Q Ai is the execution amount of the i th management account, Q Pi is the planned amount of the i-th administrative account)
And a weighted cost performance value calculated by the weighted cost performance value.
According to one embodiment,
The weighted cost performance index is an index for evaluating carbon dioxide emission amount and construction cost according to a construction schedule, and is a ratio of a weighted performance value to an execution value,
The weighted scheduling performance index is an index for evaluating a construction schedule, and may be a ratio of a weighted performance value to a planned value.
According to another aspect of the present invention, there is provided a computer-
A program written to operate the computer as a carbon dioxide-cost-schedule integrated management system according to an embodiment may be recorded.
According to another aspect of the present invention, there is provided a method for managing carbon dioxide-cost-schedule integration of a construction project based on a computer system,
Storing management accounts relating to the construction project, storing construction cost data and carbon dioxide emission data of each job in each construction stage in connection with the work of constructing each management account;
Generating a project schedule based on information related to a post-processing relationship and an operation time of each management account with reference to the management accounts;
Calculating a construction cost and a carbon dioxide emission amount of the construction process for each of the management accounts;
Constructing a schedule curve for each management account based on the project schedule;
Calculating a construction schedule weight, a carbon dioxide emission weight, and a cost weight on the influence of a certain delay of each management account on the delay of the entire schedule, the potential increase of the carbon dioxide emission amount, and the potential increase of the construction cost, for each of the management accounts;
Calculating an integrated cost weighting weight based on the integrated weight of the carbon dioxide emission based on the construction schedule weight and the weight of the CO2 emission weight, the construction schedule weight and the cost weight for each management account;
Measuring elements including the planned value, the actual value, and the execution value for each of the management accounts; calculating a weighted performance value reflecting the combined carbon dioxide emission schedule weight and the cost schedule integrated weight on the performance value; And deriving, based on the weighted performance value and the performance value, at least analysis elements including a weighted constant performance index and a weighted cost performance index.
According to one embodiment, the carbon dioxide-cost-schedule integrated management method of the construction project,
And calculating the weighted completion time prediction value based on the derived measurement factors and the analysis factors.
According to one embodiment, the carbon dioxide-cost-schedule integrated management method of the construction project,
Receiving data from a user for setting of a management account and distribution of a quantity of water through an interface module; And
And displaying the weighted constant and the index or the weighted cost performance index calculated through the interface module to the user.
According to one embodiment,
The construction cost data includes data of direct material cost, indirect material cost, direct labor cost, and indirect labor cost according to job attributes for each job,
The carbon dioxide emission amount data may include data on the carbon dioxide emission amount generated during the material production step, the material transportation step, and the site construction step according to the construction process for each work.
According to one embodiment,
The construction schedule weight is a ratio of the operation time to the sum of the operation time and the total free time of each management account,
(Where A Di is the job density ratio of the ith administrative account, D i is the work time of the i th administrative account, TF i is the total free time of the i th administrative account)
The ratio of the work density of each management account to the sum of the total work density ratios based on the job density ratios of the management accounts defined as follows:
(Where W Si is the construction schedule weight of the i-th management account and A Di is the job density ratio of the i-th management account).
According to one embodiment,
The carbon dioxide emission weight is a ratio of the carbon dioxide emission of each management account to the total project carbon dioxide emission,
(Where W CO2i is the carbon dioxide emission weight of the i-th managed account, CO 2i is the carbon dioxide emission of the i-th managed account)
Can be calculated as follows.
According to one embodiment,
The cost weight is a ratio of the budget of each management account to the budget of the entire project,
(Where W Ci is the cost weight of the ith managed account and C i is the construction cost of the ith managed account)
Can be calculated as follows.
According to one embodiment,
The carbon dioxide emission scheduling integrated weight is calculated by integrating the weight of the construction schedule and the carbon dioxide emission weight for each management account,
(Where RW CO2i is the integrated weighted ratio of CO2 emissions for the i-th management account, and ICO2i is the integrated weight for the i-th management account)
Lt; / RTI >
The cost schedule integration weight is calculated by integrating the schedule weight and the cost weight for each management account,
(Where RW Ci is the cost schedule unified weighting ratio of the ith managed account and W ICi is the integrated cost weighting of the ith managed account)
As shown in FIG.
According to one embodiment,
The weighted performance value is calculated by the following equation
(Here, W_BCO 2 WP i have i weighted carbon emissions performance worthy of the second administrative account, B CO2 AC is the time of completion of project carbon dioxide emissions, W ICO2i is i carbon dioxide emissions constant consolidation weights of the second administrative account, Q Ai is the i-th management accounts Q Pi is the planned amount of the i-th management account)
The weighted carbon dioxide emission amount calculated by the performance value,
The following equation
(Where W_BCWP i is the weighted cost performance value of the i th management account, B cost AC is the completion planning cost, W ICi is the integrated cost weighting of the i th management account, Q Ai is the execution amount of the i th management account, Q Pi is the planned amount of the i-th administrative account)
And a weighted cost performance value calculated by the weighted cost performance value.
According to one embodiment,
The weighted cost performance index is an index for evaluating carbon dioxide emission amount and construction cost according to a construction schedule, and is a ratio of a weighted performance value to an execution value,
The weighted scheduling performance index is an index for evaluating a construction schedule, and may be a ratio of a weighted performance value to a planned value.
According to the carbon dioxide-cost-schedule integrated management system and method in the building construction project of the present invention, evaluation of the project performance (carbon dioxide emission amount and construction cost) according to the construction schedule by utilizing the management account concept based on the classification system And predicted.
According to the carbon dioxide-cost-schedule integrated management system and method in the building construction project of the present invention, by applying the integrated weights according to the management accounts, it is possible to more accurately evaluate the project performance (CO2 emissions and construction cost) Can be predicted.
According to the carbon dioxide-cost-schedule integrated management system and method in the building construction project of the present invention, by utilizing a system capable of planning, monitoring, evaluating and predicting the carbon dioxide emission at the construction stage, We can prepare for the trade system.
The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.
1 is a block diagram illustrating a carbon dioxide-cost-consistent integrated management system in accordance with an embodiment of the present invention.
FIG. 2 is a conceptual diagram illustrating a connection relationship between a carbon dioxide emission amount and a construction cost through a management account in a carbon dioxide-cost-schedule integrated management method according to an embodiment of the present invention.
3 is a flowchart illustrating a carbon dioxide-cost-schedule integrated management method according to an embodiment of the present invention.
For the embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be practiced in various forms, The present invention should not be construed as limited to the embodiments described in Figs.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.
Throughout the specification, unless otherwise defined in context, the planned value (PV) is used in the same sense as the planning curve, the execution value (AV) is equivalent to the execution curve, and the performance value (EV) W_EV) can be used equally with the performance curves and the weighted performance curves, respectively.
1 is a block diagram illustrating a carbon dioxide-cost-consistent integrated management system in accordance with an embodiment of the present invention.
1, a carbon dioxide-cost-integrated
First, the project DB 18 stores management accounts set for each site on the basis of the work classification system separated by work type and site for one construction project, and associates with each work for constituting each management account, The cost data of the operation and the CO2 emission data of each operation in each construction stage are stored.
The project schedule generation unit 12 refers to the management accounts stored in the project DB 18, and creates a project schedule based on the information related to the line posterior relationship and the work time for each management account.
The construction cost calculation unit 13 calculates the construction cost required for the construction process for each management account.
The carbon dioxide emission calculation unit 14 calculates the amount of carbon dioxide emission caused in the construction process for each management account.
The performance measurement baseline creation unit 15 constructs a planned value curve for each management account based on the project schedule.
The weight calculation unit 16 for each management account calculates the weight of the construction schedule for the effect of a certain delay of each management account on the delay of the whole schedule, the potential increase of the carbon dioxide emission amount and the potential increase of the construction cost, And the cost weight are calculated. Based on the construction schedule weight and the CO2 emission weight for each management account, the integrated weight of the carbon dioxide emission is calculated, and the cost schedule integrated weight is calculated based on the construction schedule weight and the cost weight.
The performance analysis unit 17 measures the measurement factors including the planned value (PV), the actual value (EV) and the execution value (AV) for each management account, and measures the integrated weight of the carbon dioxide emission schedule and the integrated cost- (W_SPI) and weighted cost performance (W_SPI) based on the calculated planned value (PV), weighted performance value (W_EV) and execution value (AV) (W_CPI). In addition, the performance analyzer 17 may calculate the weighted completion time prediction value W_EAC based on the derived measurement factors and the analysis factors.
The interface module 11 inputs data from the user for setting the classification scheme, setting the detail level, inputting the job data, setting the management account, and setting the quantity distribution in the operation of the carbon dioxide-cost-schedule integrated
The carbon dioxide-cost-schedule integrated management process using the carbon dioxide-cost-schedule integrated
1. Step 1: Define Project Tasks and Organizations
The defining the project scope is the most proactive step for project management, and it is the process of categorizing all the activities of the project in stages.
Depending on the end user's purpose, the level of detail of the work breakdown structure (WBS) is determined, from which the control accounts can be determined. Typically, managed accounts are the basic unit for measuring cost-performance in Earned Value Management theory (EVM).
In the present invention, the work classification system sets management accounts based on an elemental breakdown structure, that is, a classification system according to sites such as formwork, concrete, and steel bar. The amounts corresponding to each managed account are summed.
FIG. 2 is a graph illustrating the relationship between the carbon dioxide emission amount through the management account in the carbon dioxide-cost-schedule integrated management method according to an embodiment of the present invention, This is a conceptual diagram illustrating the connection relationship between construction costs.
In Figure 2, the site-by-site work breakdown structure of a simple construction project includes three perimeter management accounts: a perimeter slab, a tower corewall, and a surrounding slab B, It is exemplified that the tower inner wall control account consists of works such as concrete, formwork, and rebar.
Carbon dioxide emissions and costs can be calculated for each operation. For this, a CO2 package and a cost package are constructed in advance. Here, the carbon dioxide package has data on the amount of carbon dioxide emissions generated in the material production stage, the material transportation stage, and the site construction stage according to the construction process for each work, and the cost package has a direct material cost, We have data on labor costs and indirect labor costs.
Based on this classification scheme, the carbon dioxide emission data in the carbon dioxide package corresponding to each operation in the management account and the cost data in the cost package can be linked to the management account.
Since the management accounts are constructed based on quantity, it is possible to manage the progress of the project by grasping the quantity according to the construction schedule.
The work configuration of the management account and the quantity information allocated to the work should be reconfigured and reentered for each project. However, this hassle can be solved because there are many common parts between the projects and the reusability is high.
Referring back to FIG. 1, the management account list, the carbon dioxide package, and the cost package according to the work classification scheme of the project are stored in the project DB 18.
Step 2: Scheduling
Scheduling of the project can be performed using Critical Path Method (CPM) and Program Evaluation and Review Technique (PERT).
The basic elements of CPM / PERT are as follows.
end. List of management accounts according to job classification scheme creation
I. Project network diagram in which managed accounts are placed in consideration of the line-by-line relationship of managed accounts
All. Time spent by managed accounts
Especially, it is reasonable to apply the probabilistic value rather than the deterministic value because the fluctuation of working time frequently occurs and the trend is also uncertain. In addition, triangular distribution or beta distribution can be applied at the beginning of the construction project due to insufficient basis of estimation.
In order to use the PERT technique, it is possible to estimate the time required under the ideal situation by applying the three values according to the time estimation, the time estimation under normal circumstances and the time estimation under the worst case.
The project schedule can be established by applying the CPM method based on the estimated time by management account and the line-by-line relationship of each account.
The established project schedule can be stored in the project DB 18.
Step 3: Calculate carbon dioxide emissions and construction costs
It is possible to calculate the amount of carbon dioxide emission and the construction cost that are generated in each construction stage for each management account.
Construction phase consists of material production phase, material transportation phase and field construction phase. In the material production stage, carbon dioxide is generated from energy consumption for material production, and material and labor costs arise. In the material transportation phase, carbon dioxide is generated from energy consumption for transportation of materials, rental cost of transportation equipment or depreciation cost and labor cost. In the field construction stage, carbon dioxide is generated from the energy consumption of the site construction equipment, and rental costs or depreciation costs and labor costs arise in the field construction equipment.
Specifically, in the material production stage, the carbon dioxide emission amount is calculated through the input quantity and the carbon dioxide conversion coefficient that can be referred to from the national LCI (Life Cycle Inventory) DB, as shown in the following Equation 1, It can be calculated through input quantity and unit price.
Where CO 2 MM is the carbon dioxide emission in material manufacturing, n is the number of managed accounts, i is the index of the managed account, MQ i is the material quantity corresponding to the i-th managed account, CCF i is the Carbon dioxide Conversion Factor in the national LCI corresponding to the i-th managed account.
Where CMM is the construction cost in Material Manufacturing, n is the number of managed accounts, i is the index of the managed account, MQ i is the amount of material corresponding to the i-th managed account, Unit Cost i is the i- The unit price of the material corresponding to the account.
Secondly, in the material transportation stage, the carbon dioxide emission amount is calculated as shown in Equation (3) as follows: input quantity, equipment load capacity of transportation equipment, transportation distance, equipment fuel efficiency, (CCF), and the construction cost can be calculated by using the input amount, the loading load of the transportation equipment, the transportation distance, the fuel consumption and the fuel cost as shown in the following equation (4).
The CO 2 MT is material transport phase carbon dioxide emissions (Carbon Dioxide emission in Material Transportation) , n is the number of managed accounts, i is an index, MQ i of managed accounts material volume corresponding to the i-th management accounts, ELC i have i The Equipment Load Capacity for the material corresponding to the i-th management account, TD i is the Transportation Distance for the material corresponding to the i-th management account, and EFE i is the material corresponding to the i- Equipment Fuel Efficiency, and CCF i is the carbon dioxide conversion factor in the national LCI.
Where CMT is the construction cost in Material Transportation, n is the number of managed accounts, i is the index of the managed account, MQ i is the amount of the material corresponding to the i-th managed account, ELC i is the i- , TD i is the transportation distance for the material corresponding to the i-th management account, EFE i is the fuel cost for the material corresponding to the i-th management account, and FC i is the equivalent of the i-th management account Fuel cost of the material.
Third, in the field construction stage, the carbon dioxide emission amount can be calculated through the input amount, the energy consumption per unit amount of the site construction equipment and the carbon dioxide conversion coefficient as shown in the following Equation 5, and the construction cost is calculated as follows , Can be calculated by applying energy consumption per unit quantity and fuel cost of field construction equipment.
The CO 2 OC is a field construction phase carbon dioxide emissions (Carbon Dioxide emission in On-site Construction), n is the number of the administrative account, i is an index, MQ i of the administrative account is material volume corresponding to the i-th management account, ECUQ i Is the Energy Consumption per Unit Quantity of the material corresponding to the i-th managed account, and CCF i is the carbon dioxide conversion factor in the national LCI.
The COC has on-site construction phase the construction costs (construction Cost in On-site Construction ), n is the number of managed accounts, i is an index, MQ i of managed accounts material volume corresponding to the i-th management accounts, ECUQ i is the i-th FC i is the fuel cost corresponding to the i-th management account.
The total amount of carbon dioxide emission and total construction cost can be calculated as shown in the following Equations (7) and (8)
Where TCO 2 is the total carbon dioxide emission, CO 2 MM, CO 2 MT, and CO 2 OC are the carbon dioxide emission values at the material production stage, the material transportation stage, and the field construction stage, respectively.
Here, TC is total construction cost, and CMM, CMT, and COC are construction cost values at the material production stage, the material transportation stage, and the field construction stage, respectively.
4. Step 4: Establishment and weighting of project performance measurement baseline
The performance measurement baseline refers to the planned value curve (PV) for each management account and is based on an evaluation of the earned value curve (EV) according to the construction schedule do.
Performance measurement baselines can be calculated by cumulative sum of CO2 emissions and construction costs according to the construction schedule of each management account.
In particular, in the EVM methodology, the planning curve refers to the Budgeted Cost for Work Scheduled (BCWS). In the methodology of the present invention, the planning curve represents the planned curves (BCO 2 WS, Budgeted CO 2 for Work Scheduled) Set as the measurement reference line.
In order to establish a performance measurement baseline, the allocation of the quantity should be made according to the schedule of construction considering the characteristics of each management account. Because there is a lack of available information in the project phase prior to the construction phase and there is a limit to performing such work, the end user may use the standard distribution curves, which are statistically standardized models, , It is possible to distribute the quantity to the construction schedule taking into consideration the characteristics of the management account.
Next, in order to accurately calculate the performance curve according to the construction schedule, it is necessary to calculate the weight of the project performance measurement curve by three kinds of weighting values, construction schedule weight, carbon dioxide emission weight, and cost weight, An integrated weight should be calculated.
First, the construction schedule weight is a weight considering the effect of delay of each management account on delay of total schedule.
Define the activity density rate for each managed account to derive construction schedule weights. The job density ratio is defined as a ratio of the working time to the sum of the duration and the total float of each management account, as shown in the following equation (9).
Where A Di is the Activity Density rate of the i th Administrative Account, D i is the Duration of the i th Administrative Account and TF i is the Total Float of the i th Administrative Account .
For example, if a managed account is located on the critical path, the total free time for this managed account is zero, and the percentage of this managed account's job density is one. In other words, the larger the percentage of work density, the greater the impact of the managed account on the construction schedule, which implies that the management account has a significant impact on the overall schedule delay. On the contrary, a management account with a small duty ratio has a low impact on the overall schedule delay.
The construction schedule weight for each management account can be calculated as the following equation (10) as a work density ratio for each management account in relation to the sum of the total work density ratios, using the operation density ratios for these management accounts. The total of construction schedule weights is 1.
Where W Si is the weight of construction schedule for the i-th management account and A Di is the job density ratio for the i-th management account.
Second, the carbon dioxide emission weight is a weight that takes into account the potential increase in carbon dioxide emissions as a result of certain delays in certain administrative accounts.
The carbon dioxide emission weight is a ratio of the carbon dioxide emission amount of the specific management account to the total project carbon dioxide emission amount, and can be calculated by the following equation (11). The sum of the carbon dioxide emission weights is one.
Where W CO2i is the Weight of Carbon Dioxide emission for the i th controlled account and CO 2i is the Carbon Dioxide emission for the i th controlled account.
The closer to 1 the carbon dioxide emission weight per managed account is, the higher the potential increase in carbon dioxide emissions due to a certain delay.
Third, cost weights are weights that take into account potential increases in construction costs due to certain delays in certain administrative accounts.
The cost weight can be calculated as the following formula (12) as the ratio of the budget of the specific management account to the budget of the entire project. The sum of the cost weights is one.
Where W Ci is the weight of construction cost of the i th administrative account and C i is the construction cost of the i th administrative account.
The closer to 1 the cost weight per managed account is, the higher the potential increase in construction cost due to the delays.
Fourth, as shown in Equation (13), it is possible to calculate the integrated weight (W ICO2i ) of the carbon dioxide emission by management account by integrating the construction schedule weight (W Si ) and the carbon dioxide emission weight (W CO2i ) and as can be calculated for a certain construction weight (W Si) and the cost of weight (W Ci) to manage account-specific fee schedule integration weight (W ICi) integrate.
Where RW CO2i is the cumulative weighted ratio of CO2 emissions for the i-th managed account, and W ICO2i is the cumulative weight of CO2 emissions for the i-th managed account.
Where RW Ci is the cost schedule unified weighting ratio of the i th management account and W ICi is the cost schedule unified weighting of the i th management account.
On the other hand, these integrated weights can be used as a risk evaluation index according to the construction schedule.
Step 5: Project Performance Monitoring and Forecasting
In order to monitor and predict the performance of the project, a procedure can be performed to monitor project performance based on the measurement factors, to evaluate the project performance based on the analysis factors, and to predict the project performance by the prediction factors.
Measuring elements, analysis elements and projection elements can be illustrated as shown in Table 2 below.
The monitoring of project performance is based on three measurement factors: Planned Value (PV), Actual Value (AV), which is also referred to as budget, and Earned Value (EV) . ≪ / RTI >
Planned value (PV) refers to the planned curve according to the construction schedule, and serves as a performance measurement baseline for evaluating the performance curve and is calculated as planned workload (BCWS) and planned discharge (BCO 2 WS). As shown in Table 2, the planned value is calculated by multiplying the planned unit CO 2 or the planned unit cost per unit account by the planned quantity according to the construction schedule, And then multiplying the result of the multiplication.
The execution value (AV) means the execution curve according to the construction schedule. Referring to Table 2, the execution value is the actual unit CO 2 or the actual unit cost ) By multiplying the actual quantity by unit account.
The performance value (EV) means the performance curve according to the construction schedule. As shown in Table 2, the actual value is calculated by multiplying the projected unit carbon dioxide emission amount or the planned unit cost per unit account by the execution amount per unit account according to the construction schedule (BCO 2 WP, Budgeted CO 2 for Work Performance) and a budgeted construction cost for work performance (BCWP).
In order to accurately monitor the project performance, it is necessary to consider the characteristics of each account. For this purpose, it is necessary to consider the integration of management accounts before the CO2 emission curve (BCO 2 WP) and the cost performance curve (BCWP) Weighted Earned Value curves (W_BCO 2 WP, Weighted Budgeted CO 2 for Work Performance), which are defined by the following equations (15) and (16) And a weighted budgeted construction cost for work performance (W_BCWP).
Where W_BCO 2 WP i is the weighted carbon dioxide emission performance curve for the i-th managed account, B CO2 AC is the budgeted carbon dioxide at completion, and W ICO2i is the integrated weight of the carbon dioxide emission schedule for the i- , Q Ai is the Actual Quantity of the i-th Management Account and Q Pi is the Planned Quantity of the i-th Management Account.
Here, W_BCWP i is i and the weighted cost performance curve, B cost AC for the second administrative account is the time of completion of plan cost (Budgeted construction Cost At Completion), W ICi is a cost constant integration weight of the i-th management account, Q Ai is i And Q Pi is the planned amount of the i-th management account.
The project performance evaluation is then based on the analytical elements calculated from the measurement elements as illustrated in Table 2.
The analysis factors include SV (Schedule Variance) and Cost Variance (SV) corresponding to absolute values, SPI (Schedule Performance Index) and CPI (Cost Performance Index) Performance Index.
Schedule fluctuations or cost fluctuations vary widely depending on the size of the project, while a constant performance index or a cost performance index is a relative index and is scaled to a value around 1 irrespective of the project size. If the consistency index or the cost performance index is greater than 1, it means that the results are ahead of schedule. If the schedule performance index or the cost performance index is less than 1, the results are negative. do.
Referring to Table 2, the Cost Performance Index (CPI) is an index for evaluating the CO2 emission and construction cost according to the construction schedule, and is a ratio of the actual value (EV) to the execution value (AV).
For example, a CPI of 0.8 means a negative evaluation result. In terms of carbon dioxide emissions, it was planned to produce 8 carbon dioxide emissions, but actually 10 carbon dioxide emissions were generated, which means that the carbon dioxide emissions exceeded 20%. From the viewpoint of cost input, it was planned that the cost input of 8 would be generated, but actually, the cost input amounted to 10, which means that the construction cost was increased by 20%.
The SPI is an index for evaluating the construction schedule itself, which is the ratio of the projected value (PV) to the actual value (EV).
For example, if the SPI is 0.8, it also means a negative evaluation result. 10 is scheduled to be carried out, but the actual construction schedule is 8, which means that a certain delay has occurred by 20%.
We now describe the steps to predict project performance using predictive factors.
The prediction element includes Estimate At Completion (EAC), and the weighted completion time predictive value (W_EAC) can predict the carbon dioxide emission amount or the construction cost at the completion time based on the weighted performance value (W_EV) at the present time.
In Table 2, EAC is given as EAC = AV + [(BAC-EV) / index] where BAC is the sum of the planned values (PV) and index is the "Administrative Inquiry. Report as shown in "Washington DC; 1990", a value obtained by adding a weighted sum of the cost performance index (CPI) and the constant performance index (SPI), for example, 0.8 × CPI + 0.2 × It is a value given as SPI.
3 is a flowchart illustrating an integrated management method of carbon dioxide-cost-schedule of a construction project according to an embodiment of the present invention.
Referring to FIG. 3, a carbon dioxide-cost-schedule integrated management method for a construction project based on a computer system includes a step S31 in which a carbon dioxide-cost-schedule integrated
In this case, the cost data has data of direct material cost, indirect material cost, direct labor cost, and indirect labor cost according to work attributes for each work, and CO2 emission data includes data on production process, material transportation stage, Of the total amount of carbon dioxide emissions.
In step S32, the carbon dioxide-expense-schedule integrated
In step S33, the carbon dioxide-cost-schedule integrated
In step S34, the carbon dioxide-cost-schedule integrated
In step S35, the carbon dioxide-cost-schedule integrated
At step S36, the carbon dioxide-cost-schedule integrated
In step S37, the carbon dioxide-cost-schedule integrated
In step S38, in addition, the carbon dioxide-cost-schedule integrated
According to the embodiment, the step of receiving data from the user for the setting of the management account and the quantity distribution setting through the interface module 11 and the step of receiving the weighted schedule property index or the weighted cost performance index calculated through the interface module 11, To the user.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It will be understood that variations and specific embodiments which may occur to those skilled in the art are included within the scope of the present invention.
Further, the apparatus according to the present invention can be implemented as a computer-readable code on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the recording medium include ROM, RAM, optical disk, magnetic tape, floppy disk, hard disk, nonvolatile memory and the like. The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.
10 Carbon Dioxide - Cost - Schedule Integrated Management System
11 Interface module
12 Project schedule creation section
13 Construction Cost Calculator
14 Carbon Dioxide Emission Calculator
15 Performance Measurement Base Line Generator
16 Weighting calculation by management account
17 Performance Analysis Department
18 Project DB
Claims (22)
A project schedule generation unit for generating a project schedule based on information related to a posterior relationship and an operation time of each of the management accounts with reference to the management accounts;
A construction cost calculation unit for calculating a construction cost required in the construction process for each of the management accounts;
A carbon dioxide emission calculation unit for calculating a carbon dioxide emission amount caused in the construction process for each of the management accounts;
A performance measurement reference line generation unit for constructing a schedule curve for each management account based on the project schedule;
The schedule schedule weight, the CO2 emission weight, and the cost weight are calculated for each administrative account and the schedule delay of each management account affects the delay of the entire schedule, the potential increase of the CO2 emission amount and the potential increase of the construction cost, A weight calculation unit for calculating the integrated weight of carbon dioxide emission based on the construction schedule weight and the weight of the CO2 emission weight for each management account, and calculating the cost schedule integrated weight based on the construction schedule weight and the cost weight;
Measuring elements including the planned value, the actual value, and the execution value for each of the management accounts; calculating a weighted performance value reflecting the combined carbon dioxide emission schedule weight and the cost schedule integrated weight on the performance value; A performance analyzer for deriving analytical elements including at least a weighted constant performance index and a weighted cost performance index based on weighted performance values and execution values.
The construction cost data includes data of direct material cost, indirect material cost, direct labor cost, and indirect labor cost according to job attributes for each job,
Wherein the carbon dioxide emission amount data includes data on the carbon dioxide emission amount generated at each of the material production stage, the material transportation stage, and the site construction stage according to the construction process.
The construction schedule weight is a ratio of the operation time to the sum of the operation time and the total free time of each management account,
(Where A Di is the job density ratio of the ith administrative account, D i is the work time of the i th administrative account, TF i is the total free time of the i th administrative account)
The ratio of the work density of each management account to the sum of the total work density ratios based on the job density ratios of the management accounts defined as follows:
(Where W Si is the construction schedule weight of the i-th management account, and A Di is the work density ratio of the i-th management account).
The carbon dioxide emission weight is a ratio of the carbon dioxide emission of each management account to the total project carbon dioxide emission,
(Where W CO2i is the carbon dioxide emission weight of the i-th managed account, CO 2i is the carbon dioxide emission of the i-th managed account)
Is calculated as: < EMI ID = 1.0 >
The cost weight is a ratio of the budget of each management account to the budget of the entire project,
(Where W Ci is the cost weight of the ith managed account and C i is the construction cost of the ith managed account)
Is calculated as: < EMI ID = 1.0 >
The carbon dioxide emission scheduling integrated weight is calculated by integrating the weight of the construction schedule and the carbon dioxide emission weight for each management account,
(Where RW CO2i is the integrated weighted ratio of CO2 emissions for the i-th management account, and ICO2i is the integrated weight for the i-th management account)
Lt; / RTI >
The cost schedule integration weight is calculated by integrating the schedule weight and the cost weight for each management account,
(Where RW Ci is the cost schedule unified weighting ratio of the ith managed account and W ICi is the integrated cost weighting of the ith managed account)
Is calculated as follows: < EMI ID = 1.0 >
The weighted performance value is calculated by the following equation
(Here, W_BCO 2 WP i have i weighted carbon emissions performance worthy of the second administrative account, B CO2 AC is the time of completion of project carbon dioxide emissions, W ICO2i is i carbon dioxide emissions constant consolidation weights of the second administrative account, Q Ai is the i-th management accounts Q Pi is the planned amount of the i-th management account)
The weighted carbon dioxide emission amount calculated by the performance value,
The following equation
(Where W_BCWP i is the weighted cost performance value of the i th management account, B cost AC is the completion planning cost, W ICi is the integrated cost weighting of the i th management account, Q Ai is the execution amount of the i th management account, Q Pi is the planned amount of the i-th administrative account)
And a weighted cost performance value calculated by the total cost management system.
The weighted cost performance index is an index for evaluating carbon dioxide emission amount and construction cost according to a construction schedule, and is a ratio of a weighted performance value to an execution value,
Wherein the weighted constant and performance index is an index for evaluating a construction schedule and is a ratio of a weighted performance value to a planned value.
Storing management accounts relating to the construction project, storing construction cost data and carbon dioxide emission data of each job in each construction stage in connection with the work of constructing each management account;
Generating a project schedule based on information related to a post-processing relationship and an operation time of each management account with reference to the management accounts;
Calculating a construction cost and a carbon dioxide emission amount of the construction process for each of the management accounts;
Constructing a schedule curve for each management account based on the project schedule;
Calculating a construction schedule weight, a carbon dioxide emission weight, and a cost weight on the influence of a certain delay of each management account on the delay of the entire schedule, the potential increase of the carbon dioxide emission amount, and the potential increase of the construction cost, for each of the management accounts;
Calculating an integrated cost weighting weight based on the integrated weight of the carbon dioxide emission based on the construction schedule weight and the weight of the CO2 emission weight, the construction schedule weight and the cost weight for each management account;
Measuring elements including the planned value, the actual value, and the execution value for each of the management accounts; calculating a weighted performance value reflecting the combined carbon dioxide emission schedule weight and the cost schedule integrated weight on the performance value; And deriving analytical elements including at least a weighted constant performance index and a weighted cost performance index based on the weighted performance value and the execution value.
Calculating a weighted completion time predicted value based on the derived measurement factors and the analysis factors. ≪ RTI ID = 0.0 > 11. < / RTI >
Receiving data from a user for setting of a management account and distribution of a quantity of water through an interface module; And
Further comprising the step of displaying to the user a weighted schedule performance index or weighted cost performance index calculated through the interface module.
The construction cost data includes data of direct material cost, indirect material cost, direct labor cost, and indirect labor cost according to job attributes for each job,
Wherein the carbon dioxide emission amount data includes data on the carbon dioxide emission amounts generated in the material production step, the material transportation step, and the site construction step according to the construction process for each work.
The construction schedule weight is a ratio of the operation time to the sum of the operation time and the total free time of each management account,
(Where A Di is the job density ratio of the ith administrative account, D i is the work time of the i th administrative account, TF i is the total free time of the i th administrative account)
The ratio of the work density of each management account to the sum of the total work density ratios based on the job density ratios of the management accounts defined as follows:
(Where W Si is the construction schedule weight of the i-th management account, A Di is the work density ratio of the i-th management account), and the integrated management method of the carbon dioxide-cost-schedule of the construction project .
The carbon dioxide emission weight is a ratio of the carbon dioxide emission of each management account to the total project carbon dioxide emission,
(Where W CO2i is the carbon dioxide emission weight of the i-th managed account, CO 2i is the carbon dioxide emission of the i-th managed account)
And calculating the carbon dioxide-cost-schedule integrated management method of the construction project.
The cost weight is a ratio of the budget of each management account to the budget of the entire project,
(Where W Ci is the cost weight of the ith managed account and C i is the construction cost of the ith managed account)
And calculating the carbon dioxide-cost-schedule integrated management method of the construction project.
The carbon dioxide emission scheduling integrated weight is calculated by integrating the weight of the construction schedule and the carbon dioxide emission weight for each management account,
(Where RW CO2i is the integrated weighted ratio of CO2 emissions for the i-th management account, and ICO2i is the integrated weight for the i-th management account)
Lt; / RTI >
The cost schedule integration weight is calculated by integrating the schedule weight and the cost weight for each management account,
(Where RW Ci is the cost schedule unified weighting ratio of the ith managed account and W ICi is the integrated cost weighting of the ith managed account)
And calculating the carbon dioxide-cost-schedule integrated management method of the construction project.
The weighted performance value is calculated by the following equation
(Here, W_BCO 2 WP i have i weighted carbon emissions performance worthy of the second administrative account, B CO2 AC is the time of completion of project carbon dioxide emissions, W ICO2i is i carbon dioxide emissions constant consolidation weights of the second administrative account, Q Ai is the i-th management accounts Q Pi is the planned amount of the i-th management account)
The weighted carbon dioxide emission amount calculated by the performance value,
The following equation
(Where W_BCWP i is the weighted cost performance value of the i th management account, B cost AC is the completion planning cost, W ICi is the integrated cost weighting of the i th management account, Q Ai is the execution amount of the i th management account, Q Pi is the planned amount of the i-th administrative account)
And a weighted cost performance value calculated by the weighted cost performance value of the construction project.
The weighted cost performance index is an index for evaluating carbon dioxide emission amount and construction cost according to a construction schedule, and is a ratio of a weighted performance value to an execution value,
Wherein the weighted constant and performance index is an index for evaluating a construction schedule and is a ratio of a weighted performance value to a planned value.
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