• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.16 no.27
• /
• pp.35-42
• /
• 1993

Just in time backup of the essential materials at industry and military is very important. Especially in case of military essential materials at wartime is so important as it controls victory and/or defeat. This paper presents the new approach for just in time suppling the essential materials at the beginning wartime - security step of materials, reservation priority and quantity requirement degree. In order to build the new approach, we introduced the concepts of cost and effect analysis for each essential item. First of all, the developed model will be useful to maximize combat sustaning power under constraint of budget.

• Health Policy and Management
• /
• v.13 no.3
• /
• pp.21-34
• /
• 2003

Patient revisit to used hospital is a key factor in determining a health care organization's competitive advantage and survival. This article examines the relationship between customer's satisfaction and his/her revisit associated with three different methods which are the Chi Square Automatic Interaction Detection(CHAID) for segmenting the outpatient group, logistic regression and neural networks for addressing the outpatient's revisit. The main findings indicate that the important factors on outpatient's revisit are physician's kindness, nurse's skill, overall level of satisfaction, hospital reputation, recommendation, level of diagnoses and outpatient's age. Among these ones, physician's kindness is the most important factor as guidelines for decision of their revisit. The decision maker of hospital should select the strategy containing the variable amount of the level of revisit and size of outpatient's group under the constraint on the hospital's time, budget and manpower given. Finally, this study shows that neural networks, as non-parametric technique, appear to more correctly predict revisit than does logistic regression as a parametric estimation technique.

• Proceedings of the ESK Conference
• /
• 1995.10a
• /
• pp.41-45
• /
• 1995

Menu-driven interfaces are frequently employed for user -system interfaces on many electronic products. Due to the space and budget constraint, a single or multi-line display is used to show menu items. Single or Multi-line display present 8 .approx. 21 characters on an LCD screen and users select items using a series of button pushes. Multi-line displays are different from the single-line ones in the following aspects. First, they can present multiple menu items at the same time. Second, they can present menu items in a various way, for example, same-depth presentation, sub-depth presentation, previous selection, etc. In this study, a human factors experiment is being conducted to examine the effects of three independent variables on the design of a multi-line display. Factors investigated include menu structure, number of lines on the display, item presentation methodl. Usability of the multi-line display is being measured quantitatively in terms of four different aspects: task completion time, accuracy, inefficiency, user preference. A set of design guidelines will be drawn from this study which can be applied to usef-system interfaces of a various types of consumer products.

• IE interfaces
• /
• v.17 no.spc
• /
• pp.69-78
• /
• 2004

This paper presents a simulated algorithm(SA) for the optimal reliability design problem of a series system with multiple component choices incorporated at each subsystem. The objective of the problem is to maximize the system reliability while satisfying some constraint on system budget. The problem is formulated as a nonlinear binary integer programming problem and characterized as an NP-hard problem. The SA algorithm is developed by introducing some solution-improvements methods. Numerical examples are tested and the results are compared. The results have demonstrated the efficiency and the effectiveness of the proposed SA algorithm.

• Proceedings of the Korea Society for Simulation Conference
• /
• 2001.10a
• /
• pp.72-76
• /
• 2001

Experimental design in simulation provides an efficient way of economizing simulation runs since a considerable number of simulation runs that originally were planned can be reduced by this approach. This experimental design method is an active area of research together with the output analysis and so no single panacea seems to exist so far. Thus, selection of techniques of experimental design and output analysis more lithely depends upon the objective of simulation analysis, budget constraint and sometimes the analysts subjective judgment. This paper attempts to describe an experimental design methodology for port investment analysis using a case study in a bulk terminal in Korea. Detailed display will be focused on simulation period, warm-up period, the number of replications needed in production runs after brief explanation on the system configuration.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.37 no.3
• /
• pp.113-121
• /
• 2014

This paper considers a scheduling problem in a two-machine flowshop with outsourcing strategy incorporated. The jobs can be either processed in the first machine or outsourced to outside subcontractors. This paper wants to determine which jobs to be processed in-house and which jobs to be outsourced. If any job is decided to be outsourced, then an additional outsourcing cost is charged The objective of this paper is to minimize the sum of scheduling cost and outsourcing cost under a budget constraint. At first this paper characterizes some solution properties, and then it derives solution procedure including DP (Dynamic Programming) and B&B (Branch-and-Bound) algorithms and a greedy-type heuristic. Finally the performance of the algorithms are evaluated with some numerical tests.

• Proceedings of the Korean Reliability Society Conference
• /
• 2000.11a
• /
• pp.321-328
• /
• 2000

본 연구는 새로운 장비체계 도입 시 초기 일정기간 동안 장비의 목표가용도 유지를 위해 필요한 동시조달수리부속(Concurrent Spare Parts)와 적정소요 산출에 관한 해법을 제시한다. 새로운 장비체계 도입 시 함께 보급되는 예비수리부속은 장비체계 운용에 중요한 역할을 한다. 따라서 장비체계가 주어진 임무를 수행하는 동시에 정상상태를 유지하기 위한 적정수준의 예비부속 확보가 필요하며 최소의 비용으로 장비의 가동률을 극대화 할 수 있도록 하여야 한다. 본 연구에서는 부품의 고장특성 및 수리능력을 고려한 고장분포함수를 바탕으로 각 부속별 중요도를 만족시키는 초기 수리부속 소요 결정모형과 해 산정기법을 제시하며 가용예산 제약에 따른 소요조정을 통해 최적의 예비부속 재고수준을 결정한다.

• Proceedings of the KSRS Conference
• /
• 2007.10a
• /
• pp.166-170
• /
• 2007

This paper discusses stationkeeping of COMS which accommodates two optical payloads. In order to provide good quality images to the users, the east/west stationkeeping which is strong perturbing sources shall be performed outside of mandatory observation time slots asked by users. If the east/west stationkeeping time is resulted inside of the mandatory time slots, it shall be shifted in order to be performed outside of mandatory time slot, or a new stationkeeping shall be planned. This constraint is expected to ask additional fuel consumption in comparison with tradition stationkeeping. This paper analyzes the impact of mandatory time slots to the stationkeeping fuel consumption. Orbit simulations have been conducted to determine validity of given constraints in the light of fuel requirement and stationkeeping accuracy.

• Journal of the Korea Safety Management & Science
• /
• v.9 no.6
• /
• pp.113-122
• /
• 2007

Quality function deployment(QFD) is becoming a widely used customer oriented approach. The aim of this paper is to present an analytic method of quality function deployment that is to maximize customer satisfaction, using a customer satisfaction survey conducted in the college in Korea. Combining weights and satisfaction indices, "performance/important" diagrams are to develop and this grid can be used in order to identify priorities for decision making. Also, this paper shows a 0-1 integer programming model for maximizing customer satisfaction subject to a budget constraint in QFD planning process with case study.

• Journal of the Korea Society for Simulation
• /
• v.11 no.3
• /
• pp.1-12
• /
• 2002

Experimental design in simulation provides an efficient way of economizing simulation runs since a considerable number of simulation runs that originally were planned can be reduced by this approach. This experimental design method is an active area of research together with the output analysis and so no single panacea seems to exist so far. Thus, selection of techniques of experimental design and output analysis more likely depends upon the objective of simulation analysis, budget constraint and sometimes the analyst's subjective judgment. This paper attempts to describe an experimental design methodology for port investment analysis using a case study in a bulk terminal in Korea. Detailed display will be focused on simulation period, warm-up period, the number of replications needed in production runs after brief explanation on the system configuration.