• Journal of the Korean Society for Aviation and Aeronautics
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• v.26 no.4
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• pp.20-26
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• 2018

This study analyzes the economic effect of introducing the arrival duty - free shop at Incheon International Airport. Based on the estimated sales of KRW 127 billion for the duty-free shop at the port of entry, the international balance of payments was estimated at KRW 55.5 billion. Job creation was estimated at 530, including direct and indirect workforce. With the admission of arrival duty-free shops, duty-free shops in the airline are likely to see a decline in sales, helping to improve monopoly structure on the market structure side. It is expected that the rental income generated through the operation of the arrival duty-free shop will be used as a resource for social contribution activities, creating additional social economic effects.

• Culinary science and hospitality research
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• v.9 no.3
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• pp.141-154
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• 2003

The purpose of this study is to find customer satisfaction at take-out coffee shops by examining their choice attributes, and to find the operational suggestion of the shops by identifying relations between customer satisfaction and choice factors and by finding significant factors, in order to offer subsequential developments for take-out coffee shops. When it comes to choosing a take-out coffee shop, women are found to consider pleasantness, kindness, and warranty more than men do. By age, those in the thirties are found to think much of typicalness, pleasantness, and trust than people in any age do, while those under the twenties kindness. By job, it is found that office workers think typicalness, pleasantness to be important, while students trust The more customers are satisfied at trust and kindness, the more customers are willing to use the shop again. Thus, to make the better service of take-out coffee shops, it requires drastic, continuous training for employees, introduction of specific marketings, management of corporate brand images, manpower administration that will maximize profits with small members, continuous menu development, study of taste, stage preparation and standardized service quality techniques and know-how specific to a coffee shop that will lead customers to revisit the shop.

• Journal of the Korean Society of Clothing and Textiles
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• v.27 no.1
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• pp.1-8
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• 2003

The purpose of this study is to examine the components of market orientation of apparel firms and to examine the influence of market orientation, and salesperson's job performance on the salesperson's job satisfaction. Data were obtained from 547 shop-masters working at L' Department Stores in Seoul and Bundang. Statistics used for data analysis were frequency, factor analysis, cronbach's and multiple regression analysis. The results can be summarized as follows: (1) The market orientation of apparel firms is composed of three factors: information generation, information dissemination, and the responsiveness to market information. (2) Market orientation was found to have a positive effect on salespeople's job satisfaction. (3) salespeople's job performance was found to have a positive effect on salespeople's job satisfaction.

• IE interfaces
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• v.25 no.1
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• pp.106-113
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• 2012

There are few factors like a due date observance of the customer's order, reducing the manufacturing lead time, and minimizing the inventory investment to successfully run the manufacturing system. It is difficult for corporation and a person concerned to be offered indicators to achieve few factors mentioned above from complex manufacturing systems having much fluctuations. Simplified-DBR based on TOC(Theory of Constraints) is a management paradigm which can offer indicators to effectively face with fluctuating market's needs when market's demand is smaller than a capacity of manufacturing system. This paper is offering a core indicator and management model which is needed to successfully run the manufacturing system for corporation and a person concerned who have short experience and knowledge and newly construct Sinplified-DBR manufacturing system. Thus, this paper provides a systemic guidance in the offered model through the simulation.

• Journal of Korean Institute of Industrial Engineers
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• v.35 no.1
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• pp.15-39
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• 2009

Advanced planning and scheduling (APS) refers to a manufacturing management process by which raw materials and production capacity are optimally allocated to meet demand. APS is especially well-suited to environments where simpler planning methods cannot adequately address complex trade-offs between competing priorities. However, most scheduling problems of APS in the real world face both inevitable constraints such as due date, capability, transportation cost, set up cost and available resources. In this survey paper, we address three crucial issues in APS, including basic scheduling model, job-shop scheduling (JSP), assembly line balancing (ALB) model, and integrated scheduling models for manufacturing and logistics. Several evolutionary algorithms which adapt to the problems are surveyed and proposed; some test instances based on the practical problems demonstrate the effectiveness and efficiency of evolutionary approaches.

• IE interfaces
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• v.5 no.2
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• pp.29-37
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• 1992

An approach to Just-In-Time for small job-shop-type manufacturers is presented. This is aimed at those who understand the pull production system, however, cannot afford either swift changeover in workcenters or frequent delivery to customers. First, as a production planning technique, a lot-sizing model entitled Multilevel Least Total Cost Model(MLTCM) is developed; The production order quantities of each components be those requiremensts of the end item production lot. The contribution of MLTCM is shown via simulation. Then, a framework of the Kanban operations is designed; A Production Control Kanban is introduced as a communication tool with Production Kanban in a job-shop.

• Journal of the Korea Society for Simulation
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• v.9 no.1
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• pp.21-38
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• 2000

A fuzzy dispatching algorithm with adaptable control scheme is proposed for more flexible and adaptable operation of AGV system. The basic idea of the algorithm is prioritization of all move requests based on the fuzzy urgency. The fuzzy urgency is measured by the fuzzy multi-criteria decision-making method, utilizing the relevant information such as incoming and outgoing buffer status, elapsed time of move request, and AGV traveling distance. At every dispatching decision point, the algorithm prioritizes all move requests based on the fuzzy urgency. The performance of the proposed algorithm is compared with several dispatching algorithms in terms of system throughput in a hypothetical job shop environment. Simulation experiments are carried out varying the level of criticality ratio of AGVs , the numbers of AGVs, and the buffer capacities. The rule presented in this study appears to be more effective for dispatching AGVs than the other rules.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.47-48
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• 2018

본 논문에서는 NP-hard 문제로 알려진 잡샵 스케쥴링에 대하여 강화학습적 측면에서 접근하는 방식에 대해 제안한다. 다양한 시간이 소요되는 업무들이 가지는 특징들을 최대한 state space aggregation에 고려하고, 이를 neural network를 통해 최적화 시간을 줄이는 방식이다. 잡샵 스케쥴링에 대한 솔루션은 미래에 대한 예측이 불가능하고 다양한 시간이 소요되는 스케쥴링 문제를 최적화하는 것에 대한 가능성을 제시할 것으로 기대된다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2002.05a
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• pp.704-708
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• 2002

Production scheduling has been one of the most critical issues in a manufacturing environment Job-shop scheduling problems(JSP) are well know from the standpoint of production planning and operations control in this research scheduling against due date is a measure of performance and the objective is minimizing total weighted tardiness This paper presents an idea of decomposition of the problem and shows robustmess of the schedule under various disturbances along with exact and approximation methods. The proposed method can indeed handle shop disturbances more effectively when compared with traditional and dynamic scheduling methods.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.22 no.52
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• pp.191-201
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• 1999

There have been a huge volume of researches concerning dispatching rules in job shop environments. Strangely, studies all but one pay no attention to multiple identical jobs due to the existence of production orders each of which calls for a fixed quantity, called an order size, of a specific part. Jobs arrive in the form of production orders in most, if not all, job shop type flexible manufacturing systems. This paper presents simple processing-time-based dispatching rules, and shows experimentally based on simulation that the rules with order-size considerations perform consistently well for tardiness and utilization measures. Several alternative strategies for rule specifications are examined.