The fee system on spectrum usage is a usage fee that is charged for using spectrum provided by a wireless tower, and is used for management and promotion of the waves. The current fee system for spectrum usage in South Korea has faced many problems, such

Cost estimating is essential in decision-making for conducting project management on early design stage. The cost estimating method for each stage varies according to level of design detail. Therefore, in the cost estimating method for each stage, it must distinguish quantity items that can be directly measured from quantity items that should be predicted. The parametric estimating method is able to support cost planning for various design attributes as it is possible to set impact factors related to design features as parameters. This study suggests a prediction method for quantity information that is required to estimate the final cost during the early design stage. The case study suggests an predicting method for the steel (rebar) ratio of office buildings. The suggested parametric cost estimating model enables users to predict the steel (rebar) quantity for various design alternatives according to design features. During quantity predictions, IG(Information gain) measurements for the design attributes were analyzed, by setting the ratio of steel-rebar quantity(Ratio: ton/Concrete_㎥) as the dependent variable.

This paper examines the applicability of formal safety assessment to the passenger ships. This is followed by an analysis of passenger ship characteristics and a proposed formal safety assessment methodology. Five interlocking steps are described to construct a safety model including novel risk assessment, cost-benefit analysis and decision-making approaches. A case study is carried out in order to demonstrate the proposed methodology. Further development in formal safety assessment in the context of passenger ship safety is finally discussed in detail.

This study presents a single machine scheduling algorithm to minimize total cost(lateness cost, earliness cost and failure cost) by controlling machining speed. Generally, production scheduling uses the information of process planning and machining speed

This paper analyzes the difference between theoretical cost of quality and real world cost. Examined are the theoretical cost structure of quality, it’s measurement styles, a process based improvement strategy of quality cost, and possible adaptation of d

This paper analyzes the difference between theoretical cost of quality and real world cost. Examined are the theoretical cost structure of quality, it's measurement styles, a process based improvement strategy of quality cost, and possible adaptation of decision making concepts in enhancing the cost structure. This study will contribute to the literature in delineating an improvement process of quality cost by adjusting service policy.

  본 논문에서는 운송비용과 재고유지비용의 합을 최소화하는 것을 목적으로 유한 계획기간 동안의 수요를 충족시키는 동적 랏사이징 문제를 다룬다. 운송비용을 고려하는 기존의 랏사이징 모형들과는 달리 운송 트럭의 대수에 따라 계단형으로 운송비용이 증가하는 경우를 다루고 있다. 이 문제를 선형정수모형으로 모델링하며 그리디 방식의 휴리스틱을 제안한다. 제안된 휴리스틱의 성능을 평가하기 위해 계산실험을 수행하며, 그 결과 매우 짧은 시간 안에 최적해에 가까운 해를

At present, company has to produce a product that consumer like with a competitive price, a good quality, and a fitting time to supply. Process control and quality control are very important to supply with a product uniformly and inexpensively. Process co

본 연구에서는 거래비용이론을 기반으로 하여 해외합작투자 소유지분 (다수지분 대 소수지분) 결정요인을 거래자산특유성과 불확실성으로 구분하여 이론적모형을 정립하였고, 이 모형을 이용하여 한국기업의 제조업분야 해외합작투자 소유지분 결정요인을 도출하였다. 본 연구 결과에 따르면 한국기업의 경우 평판이 높은 기업일수록 해외합작투자에 있어서 다수지분을 선호하는 것으로 분석되었고, 국가위험이 높은 국가에 진입하거나 본국과 문화적거리가 큰 국가에 진입하는 경우 한국기업은 소수지분을 선호하는 것으로 분석되었다. 그러나 기존의 연구결과와 달리 독점적지식을 많이 축적하였거나 본사의 규모가 큰 한국기업의 경우 해외합작투자에 있어서 소수지분을 선호하는 것으로 나타났다. 해외사업경험과 합작법인의 규모는 한국기업의 해외합작투자 소유지분 의사결정에는 영향을 미치지 않는 것으로 밝혀졌다.

Among the costs composing the life-cycle cost of nuclear containment, the expected loss due to leakage of radioactive material is usually exorbitant, and it takes large amount in the evaluation of life-cycle cost. This study presents a process to determine optimal target reliability for nuclear containments, mainly focuses on its expected loss. It is estimated considering the surrounding environment of nuclear containment. Target reliability of containments having different lifespan can be determined by revising the expected loss estimated from the 20, 40 and 60 years of operation.