• The Journal of Society for e-Business Studies
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• v.16 no.4
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• pp.109-123
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• 2011

The maintenance prices in information security industry between Korean companies and foreign companies have been a big difference. Korea Information Security SW maintenance standards were not adequate for the rate, and there was disagreement between domestic companies and governments. This research, therefore, surveyed a standard of information SW and the status of maintenance payment rates. The study suggests an estimation method and verifies the method and an appropriate maintenance cost rate. According to the results of the study, the current maintenance cost should be increased or decreased independent with a kind of information security systems. Based on the study, Korea government is able to change the maintenance policy in information security. And the domestic companies get a theoretical ground for improving the rates of maintenance costs in information security systems and are able to allot the resources effectively.

• Korean Journal of Construction Engineering and Management
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• v.17 no.5
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• pp.54-61
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• 2016

The initial planned annual cost is frequently adjusted under the construction process in construction projects. If the annual cost is reduced than the initial planned cost, the number of possible activities is also reduced from initial planned progress schedule. In such cases, project manager need to replan the progress schedule with possible activities within changed annual cost. However, most project manager will proceed as planned schedule without any change. After the project cost has been exhausted, there are many cases to stop the operation of the construction site. This study developed active 5D CAD system that can replan the progress schedule within changed annual cost and simulate the cost status according to the changed schedule for cost visualization. This system can be used as a decision-making tool in the replaning progress schedule and will be able to increase the practical usability of 5D CAD system.

• Korean Journal of Construction Engineering and Management
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• v.5 no.2 s.18
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• pp.181-193
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• 2004

A life cycle cost analysis model for public water supply systems should be different from the ones for other civil and architectural facilities as the operation and the maintenance cost of the water supply systems mainly come from the various mechanical systems and the pipeline systems of the collecting/treating/distributing facilities. This paper presents a cost classification scheme and a probabilistic life cycle cost analysis (PLCCA) model for public water supply systems. A value analysis (VA) procedure that is well suited for practical purposes is also presented. The presented probabilistic life cycle model and the value analysis procedure were applied to a real world project, and this case study is discussed in the paper. The model and the procedure presented in this study can greatly contribute to the value-oriented design alternative selection, the estimation of the maintenance cost, and the allocation of budget for water supply system construction projects.

• Journal of Korean Society of Forest Science
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• v.106 no.3
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• pp.300-309
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• 2017

The productivity, cost, and optimal forest road network density for tree-length yarding with K301-4 and HAM300 tower yarders were analyzed. The results showed that productivity decreased as the yarding distance increased. The productivity of the K301-4 was greater than that of the HAM300 as the maximum yarding distance was longer than 34 m. This difference increased as the load volume increased. As the K301-4 yarder had a higher purchase price and it took more time to set up compared to the HAM300, the HAM300 was cost effective. Therefore, in oder to introduce tower yarders to reduce operational cost, it is effective to increase the load volume during operations and to utilize the road network repeatedly for a long period.

• Informatization Policy
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• v.27 no.2
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• pp.40-65
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• 2020

The purpose of this study is to prevent enactment of regulations on the basis of fragmented claims by stakeholders about e-government business regulations, and to rather decide whether to introduce regulation by quantitative methods based on cost-benefit analysis. To this end, a quantitative regulatory analysis model is to be prepared based on the policy objectives to be pursued when preparing e-government regulations. First, for regulating e-government business, the policy objectives to be pursued were derived large and small categories by applying the Delphi technique. The importance of each policy objective item was then set by applying the AHP technique. Also, based on this analysis model, the appropriateness of the existing e-government regulations was analyzed. As a result of the analysis, many of the regulations partly met the objectives discussed at the time of enactment, but negative effects were also observed in terms of overall efficiency and consumer benefits.

• Journal of the Korea Society for Simulation
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• v.28 no.1
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• pp.57-65
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• 2019

Air refueling is expected to increase the efficiency of the air force operations. This follows from the introduction of air refueling aircraft, which should to increase operational time by increasing the range and duration of fighter jets. Despite the effectiveness of the air refueling air crafts, the astronomical costs of adapting the air tankers call for careful discussions on whether to acquire any air craft and if so, how many. However there is no academic study on the subject to our knowledge. Thus, we use the ABM(Agent Based Modeling) technique to calculate the optimal number of air tankers during patrol operation. We have enhanced the reliability of the simulation by entering the specifications of the current aircraft operated by the Korean Air Force. As an optimization tool for determining the optimal number of counts, we use OptQuest built into the simulation tools and show that the optimal number of air tanker is 4.

• The Journal of Society for e-Business Studies
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• v.26 no.3
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• pp.55-66
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• 2021

The mobile application (APP) market is growing at an unprecedented speed. Amid such growth, the global platform providers are mandating exclusive in-app payments and charging 30% for platform commission fees. A serious tension has arisen between mobile global platform providers and local content providers. The present study attempts to analyze the domestic mobile game market and in-app payment commission fees. This study estimates the size of the domestic mobile game market and platform commission fees by directly using publicly available financial statements and footnote information of some representative listed mobile game firms. Also, the study analyzes the cost structures of the same sample firms and attempts to draw some implications on sustainable growths of the mobile game ecosystem. We estimated that, in 2019, the domestic mobile game market is around 4.9 trillion Won and the ensuing in-app payment commission fees market was 1.5 trillion Won. High market share firms display a proportional increase in in-app payment commission fees in relation to sales growth. This, in turn, makes the in-app payment commission fees a primary cost item far exceeding employee salaries and R&D expenses. During the same period, low market share firms generated a mere profit or experienced net loss. Analysis of the cost structure reveals that these firms are even more liable to higher in-app payment commission fee cost structure than high market share. Most constituents of the mobile game ecosystem are small business entrepreneurs. By employing a micro-level analysis, the study estimates that, in 2019, a representative median firm generates 530 million Won in sales. At the same time, it spends 190 million Won in employee salaries, 50 Won million in R&D and 190 million Won in in-app payment commission fees, respectively. In the absence of other cost items, these three cost items alone account for 73.8% of sales revenue. The results imply that a sustainable growth of the local mobile game market heavily depends upon the cost structure of such representative median firm, the in-app payment commission fees being the primary cost item of such firm.

• Explosives and Blasting
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• v.22 no.1
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• pp.15-22
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• 2004

일반적으로 석회석 광산에서의 발파는 ANFO를 사용하여 주로 시행되어지고 있다. Bulk장전 시스템의 도입으로 장약, 발파가 간편하여 효과적으로 발파를 할 수 있고 그 비용도 저렴하다는 장점을 가지고 있다. 그러나 수공에서의 장약이 불가능하고 낮은 위력으로 인해 저항선 및 공간격의 제한이 커서 이에 따르는 발파효율의 저하가 불가피 하였다. 본 연구는 현재 해외에서 일반화되어 사용되고 있는 Bulk EMX(HiMEX)폭약을 국내 현장에 적용함으로 그 적용 방법과 이점을 규명하고자 시행되었다. 대규모 석회석 광산을 대상으로 적정 패턴을 산출하기 위해 기존의 발파 패턴과 비교하여 시험발파를 시행하여 저항선 및 공간격을 산정 하였으며 이를 토대로 해서 성신양회, 현대시멘트 영월사업소와 함께 장기간 시험발파를 실시하고 그 자료를 검증하였다. 그 결과 HiMEX는 초유폭약에 비해 비중이 높아 공당 장약량은 45%정도 증가하나, 1발파 당 생산 물량이 증가하여 5%이상의 장약량 감소효과를 볼 수 있었다. 또한 35∼50%정도의 천공비용이 감소되는 것으로 나타났다.

• Proceedings of the KIEE Conference
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• 2005.11b
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• pp.325-327
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• 2005

전력시장의 본격적인 개방을 앞두고 전력품질의 평가와 적정한 가격의 반영 매커니즘은 고도한 산업구조를 뒷받침하면서 전력시스템에 대한 투자 활성화를 위해 꼭 필요한 것이다. 본 연구에서는 부하의 전압이 변동할 때 부하가 허용할 수 있는 전압의 특성을 나타낸 전력 허용성 곡선(CBEMA)을 이용하여 모선 부하들에 대한 전력품질을 지표화 하는 한편, 이를 가격으로 환산하는 방법을 제안한다. 본 연구의 장점은 각 모선에 설치된 부하의 종류 및 구성비를 기초로 부하모형을 산출하고 모선에 대표가 되는 전력품질곡선을 작성하므로, 각 모선별 전력품질 지표 및 비용의 산출이 가능하며, 이를 기초로 전력계통 문제해석시 품질비용의 취급이 가능하다는 점이다. 본 논문은 부하-전압특성을 전력허용 곡선에 의해 도출하고 각 모선별 대표 전력허용곡선을 산출한 다음 이를 모형계통에 적용함으로써 전력품질가격산정기법의 적용을 가능케하였다.

• Explosives and Blasting
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• v.23 no.1
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• pp.41-46
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• 2005

Overbreak is an inevitable during tunnel excavation. It significantly affects tunnel construction cost and safety The overbreak occurs due to incorrect expectations to the geologic structures, excessive charge or strength of explosives, etc. This paper introduces multi-hole drilling method to minimize the overbreak in tunnel excavation. Although the drilling cost of the method is more expensive than those of the existing other drilling method, it is expected at that cost will be reduced.