• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1546-1552
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• 2004

Railway schedule is periodically modified so that it could yield more profit by means of adjusting the schedule to demand. Most of related works are applicable under the given demand, but did not deal with dynamic relation between demand and schedule. To our knowledge, the methodology considering the relation is only the profitability evaluation model developed by SNCF. Our study suggests how to adjust the schedule to demand and therefore obtain more benefits using the profitability evaluation model.

• 한국CDE학회논문집
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• 제18권3호
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• pp.211-223
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• 2013

Today's ever-increasingly competitive shipbuilding market makes it essential for a shipbuilding company to have more efficient production processes and higher productivity as well as better design ability to obtain its competitiveness. A well-established production execution schedule plays an indispensable role to achieve this goal. Most shipbuilding companies carry out an evaluation on their mid-term plan once it is established. However, no evaluation activity exists for a production execution schedule, because practically all the companies depend on the field workers for the production execution scheduling. In this study, a prototype of a ship production execution schedule evaluation system is developed based on the component based design (CBD) methodology. This system enables one to make a production execution schedule that reflects up-to-date shipyard situation and to validate whether the schedule is feasible or not by running a production simulation according to the schedule. Users can also make use of the system as a decision supporting tool that compares several different execution schedules and evaluates which one is the best execution schedule.

• 정보보호학회논문지
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• 제20권2호
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• pp.131-144
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• 2010

국외 IT 선진국들은 1980년대 후반부터 정보시스템의 안전성과 신뢰성을 확보하기 위하여 정보보호제품 평가기준을 개발하여 활용하고 있다. 현재 다양한 제품의 평가를 위한 기준으로 CC를 사용하고 있으며 오랜 기간이 소요되는 제품 평가기간의 단축이 개발자 및 사용자에게 요구된다. 본 논문에서는 공개된 표준 평가기간을 참고하여 EAL4 등급의 평가기간 산정 모델을 제안한다. 또한, 이를 바탕으로 투입하는 평가자의 수와 평가 일정을 조정하여 평가신청인 입장에서 평가기간이 최소화 되는 방법을 제안한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1538-1545
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• 2004

In the train schedule plan corresponds to a master plan for transport services. This service plan must be constructed to minimize operational cost or maximize revenue considering transportation demands and resource capacities in the operation company, and it includes several sub-planning activities such as train operation frequency plan, train schedule plan, train capacity assignment plan, and rolling stock requirement plan. In this paper, we present profitability evaluation system for the current train schedule plan. The proposed system can be used for evaluating profitability by estimating train service revenue considering customer demands.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.929-934
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• 2005

The complex and dynamic job nature and the ever-changing working environment of construction projects inevitably present uncertainties to construction operations. Identification, evaluation and control of uncertainties constitute main elements of risk management and critical tasks of project management in construction. This paper is focused on application of a simplified discrete-event simulation approach in management of schedule-overrun risks, each being the combination of the occurrence probability of an uncertain interruptive factor and its potential consequence in terms of time delay. A case study observed from a concreting operation in Hong Kong is converted into a simulation model and analyzed with an in-house-developed simulation package for demonstrating how the proposed approach can be implemented to manage multiple schedule-overrun risks on construction projects.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1998년도 The Korea Society for Simulation 98 춘계학술대회 논문집
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• pp.106-110
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• 1998

Some successful scheduling systems are based on simulation technique. However, they are relatively expensive. A cost-effective solution is to apply general-purpose simulation software to the scheduling system. This paper is concerned with developing a simulation model for MPS(Master Production Schedule) evaluation system. The target system of the model is PC production system. AIM (Analyzer for Improving Manufacturing system), a well-known manufacturing oriented simulation software, is used for modeling tool. Eventually, the model can be included into an MPS evaluation system as simulation module and a scheduler can use the system to verify the MPS in advance.

• 제어로봇시스템학회논문지
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• 제11권2호
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• pp.167-174
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• 2005

This paper experimentally validates the efficacy of scheduling method that satisfies the performance requirement of periodic data in the Foundation Fieldbus. The scheduling method allocates periodic data traffic to a bandwidth-limited fieldbus medium. The scheduling method generates schedule list that records schedule starting time and schedule period of each periodic data. This study developed an experimental model of a Foundation Fieldbus network system. Using the experimental model, this study showed that the scheduling method can be easily implemented in a practical Foundation Fieldbus network system. The results obtained from the experimental evaluation showed that the scheduling method restricts the delay of periodic data to a pre-specified bound.

• 한국ITS학회 논문지
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• 제8권2호
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• pp.1-13
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• 2009

최근 각 지자체별로 ITS에서 방대한 양의 APTS(BMS, 교통카드 등)자료가 수집되고 있으나 버스배차관리에 활용되는 지표는 도착정시성과 차두간격균등성에 국한되어 있다. 수집되는 자료를 버스운행관리에 충분히 활용하지 못하고 있는 실정이다. 본 연구에서는 이용객 수요를 고려한 운수회사의 배차관리 수준을 평가하기 위해 상관계수를 이용하여 수요탄력적 배차관리지표(DEI, Demand Elastic Index)를 개발하였다. 합리적인 개발지표의 적용을 위한 이상치를 유발시키는 자료에 대한 보정방안을 강구하여 적용하였으며, 노선별 제약조건(운행대수, 배차간격 등)을 고려하여 지표의 형평성을 제고하였다. 개발된 평가지표를 서울시 전체노선(356개)에 적용하고, 노선특성(일평균배차간격, 일일수집금, 일평균운행시간, 운행대수)에 따른 적용성(형평성)을 확인하였다. 본 연구의 개발지표는 ATPS자료가 수집되는 노선의 배차계획 및 관리 수준의 평가가 가능하여, 효율적인 배차관리에 활용성이 클것으로 생각된다.

• 보건행정학회지
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• 제2권1호
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• pp.1-16
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• 1992

This study compares the physician payment of national fee schedule for Korean Medical Insurance with that of the United States based on Resource Based Relative Value Scales (RBRVS) which Hsiao developed in 1988 for the Medicare reimbursement. Through the comparison of two fees schedules, this study is purposed to evaluate the appropriateness of relative values which assigned to each physician services of Korean fee schedule. A total of 264 physician services are selected for the comparison. The ratio of Korean schedule to RBRVS is selected as an index of appropriateness. It the score of index shows large variation among services, the relative value of Korean fee schedule is inappropriate with U.S. RBRVS which was developed recently. The Ratios of Korean schedule to RBRVS are widly variated ; the range of those is 8.1 to 379.3. In subgroups which are regrouped to controll systematic differences between two national fee schedules, these ratios are also variated. Services which are relatively less compensated are management/evaluation services, while services which are relatively more compensated are invasive and imaging services. By the way, the service classification of Korean fee schedule is unclear, specially in management/evalutaion services. Therefore, Korean Medical Insurance fee schedule should be modified to be more balanced and rational.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.1436-1441
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• 2003

Recently, simulated annealing algorithms have widely been applied to many structural optimization problems. In this paper, simulated annealing, boltzmann annealing, fast annealing and adaptive simulated annealing are applied to optimization of truss structures for improvement quality of objective function and number of function evaluation. These algorithms are classified by cooling schedule. The authors have changed parameters of ASA's cooling schedule and the influence of cooling schedule parameters on structural optimization obtained is discussed. In addition, cooling schedule of BA and ASA mixed is applied to 10 bar-truss structure.