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문제 정의
- Thus it is needed to develop the cost estimation standards for the maintenance of information security software, which reflect the reality. The study aims to propose an appropriate compensation cost estimation method for information security software package that is reasonable and realistic. First of all, the author draws the implications by reviewing the previous literature and examining the current states, and attempts to calculate the costs based upon current maintenance cost standards and the costs based upon information security software maintenance activity specific cost estimation standards in order to establish the information security software response system, and ultimately suggests the maintenance cost calculation method by adopting the adjusted coefficient in the cost estimation comparison equation.
제안 방법
- The study aims to propose an appropriate compensation cost estimation method for information security software package that is reasonable and realistic. First of all, the author draws the implications by reviewing the previous literature and examining the current states, and attempts to calculate the costs based upon current maintenance cost standards and the costs based upon information security software maintenance activity specific cost estimation standards in order to establish the information security software response system, and ultimately suggests the maintenance cost calculation method by adopting the adjusted coefficient in the cost estimation comparison equation.
- Thus the study tries to calculate the current maintenance costs for each product category by applying each cost rate level ranging from 8 to 20 percent to the product specific sales unit prices in a way that follows the current maintenance cost standard method. In addition, the author calculates activity based maintenance costs specific to product by applying the number of activity based maintenance cases, solution elapsed time, number of person in need for maintenance, and learning curve in a way that follows the maintenance cost standard method for each product and activity. Then the author analyzes the difference and differential price between the higher values among activity based costs and the current costs through the simulation work on the two types of costs.
- In the calculation of activity specific cost analysis based maintenance cost, the author analyzes the major maintenance activity in the information security field and draws the cost analysis method. In addition, the labor cost level is calculated through questionnaire survey, and the author undertakes the maintenance work cost analysis simulation for activity specific cost, which leads to the calculation of optimized maintenance cost. The activity specific cost categories for the calculation of information security software maintenance cost include supplementary development activity cost, pattern sustaining activity cost, QA activity cost, and technical service activity cost, and the information security software maintenance activities are categorized as the following [Table 1].
- Current information security software maintenance cost is equivalent to that of general purpose software, and the figure is calculated in a way that multiplies the unit sales by maintenance cost rate. In order to estimate a more precise information security software maintenance cost, the author tries to calculate the activity specific cost analysis based maintenance cost.
- In this case, the author excludes the cases where the cost differential goes beyond 1000 percent between the current maintenance cost calculation standard price and activity specific maintenance cost calculation standard price as well as the cases where the answer on sales unit price information is omitted due to incomplete response by participating enterprise. In the simulation analysis, the author divides the cases into those cases where activity cost is higher than current standard and the other cases where current maintenance cost is higher than activity specific maintenance cost.
- The questionnaire survey was undertaken twice for information security software enterprises, and the first survey was sent on November 8 and received on November 19, and the second survey was sent on November 15 and received and returned on November 17 from the respondents.In the survey, the author tried to obtain the data on the product sales unit price and maintenance cost rate offered to government and enterprise by the company concerned as well as the average maintenance cost rate.
- In this study, the author attempted to estimate the adjusted coefficient in order to propose the appropriate level of information security software maintenance service cost standard by reflecting the specificity of information security. The simulation analysis revealed that it is appropriate to offer the maintenance service cost in the range of 14 to 18 percent of the current maintenance cost calculation standard in case where activity cost is higher than current standard, whereas the simulation result explained that it is appropriate to offer the maintenance service cost in the range of approximately 8 percent of the current maintenance cost calculation standard in case where the current maintenance cost is higher than activity specific maintenance cost.
- Third, the next stage is relating to the determination of relative importance of each adjustment element. It is needed to calculate the analysis value specific to adjustment element by applying the AHP analysis on the collected data from the questionnaire survey. Fourth, then the author determines the differential value depending on the level of difficulty of adjustment elements.
- Then the author analyzes the difference and differential price between the higher values among activity based costs and the current costs through the simulation work on the two types of costs. Lastly, the author finds out the adjusted coefficient that applies the relative difficulty and importance obtained in the questionnaire survey in order to adjust and control for the price difference and estimate the proper maintenance cost level. The simulation results on optimal adjusted coefficient are summarized as follows.
- The simulation is undertaken in order to obtain the optimum point in the 49 scenarios of the current maintenance costs and 7 scenarios of the activity specific maintenance costs. Next, the stage of calculating the optimal cost level to which the adjusted coefficient is applied consists of the stage that calculates the adjusted coefficient for the proposed optimal point in the simulation, and the author discovers the adjustment elements by expert survey.
- Since the gap between current information security software maintenance cost and activity specific maintenance cost calculation equations is needed to additionally adjusted and the adequate calculation of information security software maintenance cost is in need, the calculation of actual necessary maintenance cost through the comparative analysis on maintenance cost rate was undertaken by the repetitive simulation of optimal maintenance cost.
- The existing model specific studies on adjusted coefficient include COCOMO model [12], IFPUG model [16], Albrecht model [8, 9, [17], and Symon’s Mark Ⅱ, and each model suggests a wide range of adjusted coefficients. Since the model covers from the software development to management and operation, that is, every aspect of software application, the study attempts to apply the quality assessment model of ISO/IEC 9126, which is the software quality management standard and then calculate the adjusted coefficient for information security software maintenance.
- Fifth, the stage leads to the application of weight value to the adjustment element differential values. The adjustment element weight is applied as the differential caused by the difficulty of adjustment elements and related to the application of weights to actual analysis at this stage, and the maximum, average, and minimum values as well as adjusted element differential values are applied and calculated for the difficulty index specific to adjustment elements.
- First, the calculation begins from the analysis stage on the relative difficulty of adjusted element. The author applies the AHP analysis method upon the collected data from the questionnaire survey towards the enterprises, and then estimates the analyzed values specific to adjustment elements. Second, the author undertakes the relative difficulty index calculation process for adjustment elements.
- The author attempts to build the cost calculation standard for information security software that applies the adjusted coefficient by estimating the maintenance cost and cur-rent maintenance cost in cost analysis and considering the adjusted coefficient that controls for the differentials between them in order to prepare for the maintenance cost standard for information security software.
- , the author calculates the cost and cost rate by learning rates [7]. The author attempts to draw the learning rate cost by applying the concept of such learning curve, and the cost calculation equation specific to product activity that applies the learning curve is shown as below.
- The product sales unit price and maintenance cost rate for the estimation of current maintenance service cost are calculated based upon questionnaire survey, and the author conducts the product specific current standard maintenance cost analysis simulation.
- First of all, the cost comparison simulation tries to match each cost rate of 8, 10, 12, 14, 16, 18, and 20 percent to each product category. The simulation is undertaken in order to obtain the optimum point in the 49 scenarios of the current maintenance costs and 7 scenarios of the activity specific maintenance costs. Next, the stage of calculating the optimal cost level to which the adjusted coefficient is applied consists of the stage that calculates the adjusted coefficient for the proposed optimal point in the simulation, and the author discovers the adjustment elements by expert survey.
- The study has an implication that it secures the stability of knowledge information assets by drawing the standardized frame scheme for calculating the information security software maintenance service cost in a national policy aspect, and proposes the policy direction for establishing the draft for calculating the information security software maintenance service cost as well as leads the changes in public awareness on information security software. Especially by software product consumers in a demand aspect, which contributes to the systematic management of the information security software maintenance service by enterprises and establishing the standardized frame for calculating the information security software maintenance service cost.
- In addition, the author calculates activity based maintenance costs specific to product by applying the number of activity based maintenance cases, solution elapsed time, number of person in need for maintenance, and learning curve in a way that follows the maintenance cost standard method for each product and activity. Then the author analyzes the difference and differential price between the higher values among activity based costs and the current costs through the simulation work on the two types of costs. Lastly, the author finds out the adjusted coefficient that applies the relative difficulty and importance obtained in the questionnaire survey in order to adjust and control for the price difference and estimate the proper maintenance cost level.
- Thus the study tries to calculate the current maintenance costs for each product category by applying each cost rate level ranging from 8 to 20 percent to the product specific sales unit prices in a way that follows the current maintenance cost standard method. In addition, the author calculates activity based maintenance costs specific to product by applying the number of activity based maintenance cases, solution elapsed time, number of person in need for maintenance, and learning curve in a way that follows the maintenance cost standard method for each product and activity.
대상 데이터
- The questionnaire survey was undertaken twice for information security software enterprises, and the first survey was sent on November 8 and received on November 19, and the second survey was sent on November 15 and received and returned on November 17 from the respondents.In the survey, the author tried to obtain the data on the product sales unit price and maintenance cost rate offered to government and enterprise by the company concerned as well as the average maintenance cost rate.
이론/모형
- In the calculation of activity specific cost analysis based maintenance cost, the author analyzes the major maintenance activity in the information security field and draws the cost analysis method. In addition, the labor cost level is calculated through questionnaire survey, and the author undertakes the maintenance work cost analysis simulation for activity specific cost, which leads to the calculation of optimized maintenance cost.
성능/효과
- However, the cost standards for the maintenance of information security software are not established clearly yet, the law guides that parties concerned follow the calculation method based upon for calculation method depending on function point and the number and period of participating human resources for general purpose software. The maintenance cost rates are determined in the range of 10 to 15 percent of overall software cost calculated, and it has been notified that the rates are allowed to be adjusted. The calculation equation is established in a way that determines the characteristics of maintenance target system among simple, average, and complicated, and then estimates the Total Maintenance Point (TMP).
- In this study, the author attempted to estimate the adjusted coefficient in order to propose the appropriate level of information security software maintenance service cost standard by reflecting the specificity of information security. The simulation analysis revealed that it is appropriate to offer the maintenance service cost in the range of 14 to 18 percent of the current maintenance cost calculation standard in case where activity cost is higher than current standard, whereas the simulation result explained that it is appropriate to offer the maintenance service cost in the range of approximately 8 percent of the current maintenance cost calculation standard in case where the current maintenance cost is higher than activity specific maintenance cost.
후속연구
- Especially by software product consumers in a demand aspect, which contributes to the systematic management of the information security software maintenance service by enterprises and establishing the standardized frame for calculating the information security software maintenance service cost. In addition, it is expected that the establishment of standardized frame scheme for calculating the information security software maintenance service cost and estimation of appropriate level of compensation cost lead to the actualization of maintenance service cost rate and the improved service quality as well as the promotion of excellent product development.
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