• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.485-489
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• 2008

To achieve the optimal sewer layout design, most developed models are designed to determine pipe diameter, slope and overall layout in order to minimize the least cost for the design rainfall. However, these models are not capable of considering the superposition effect of runoff hydrographs entering each junction. The suggested Optimal Sewer Layout Model (OSLM) is designed to control flows and distribute the node inflows while taking into consideration the superposition effect for reducing the inundation risk from the sewer pipes. The suggested model used the genetic algorithm to determine the optimal layout, which was connected to the SWMM (Storm Water Management Model) for the calculation of the hydraulic analysis. The suggested model was applied to an urban watershed of 35 ha, which is located in Seoul, Korea. By using the suggested model, several rainfall events, including the design rainfall and excessive rainfalls, were used to generate runoff hydrographs from a modified sewer layout. By the results, the peak outflows at the outlet were decreased and the overflows were also reduced.

• Journal of the Korean Society for Precision Engineering
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• v.25 no.12
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• pp.55-64
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• 2008

This paper describes a research work of developing an automated progressive design system for manufacturing the product with multi processes such as piercing, bending, and deep drawing. An approach to the system for progressive working is based on the knowledge-based rules. Knowledge for the system is formulated from plasticity theories, experimental results and the empirical knowledge of field experts. The system consists of three main modules, which are shape treatment, strip layout, and die layout modules. Based on knowledge-based rules, the system is designed considering several factors, such as material and thickness of a product, piercing, bending and deep drawing sequence, and the complexities of the blank geometry and punch profiles. It generates the strip layout drawing for an automobile product. Die design for each process is carried out through the die layout module from the results of the strip layout module. Results obtained using the modules enable the designers for manufacturing products with multi processes to be more efficient in this field.

• IE interfaces
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• v.25 no.2
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• pp.264-275
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• 2012

The process of semiconductor(IC Package) manufacturing usually includes lots of complex and sequential processes. Many kinds of equipments are installed with the mixed concept of serial and parallel manufacturing system. The business environments of the semiconductor industry have been changed frequently, because new technologies are developed continuously. It is the main reason of new investment plan and layout consideration. However, it is difficult to change the layout after installation, because the major equipments are expensive and difficult to move. Furthermore, it is usually a multiple-objective problem. Thus, new investment or layout change should be carefully considered when the production environments likewise product mix and production quantity are changed. This paper introduces a simulation case study of a Korean company that produces packaging substrates(especially lead frames) and requires multi-objective decision support. $QUEST^{(R)}$ is used for simulation modelling and AHP(Analytic Hierarchy Process) and DEA(Data Envelopment Analysis) are used for weighting of qualitative performance measures and solving multiple-objective layout problem, respectively.

• Journal of Korean Institute of Industrial Engineers
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• v.41 no.5
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• pp.470-480
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• 2015

There are many challenges in manufacturing system for new factory construction. Although factories produce same product, the layout of each factory may be different. The body shop in an automotive factory is a typical flow line with assembly, but the layout concept of the line varies among factories. In this paper, two types of layouts in the body shops of automotive factories, one for layered build and the other for modular build, are compared using simulation study. The simulation experiments indicate that the modular build layout is better than the layered build layout with respect to production rate. The effects of various failure distributions on the throughputs are also investigated, and some insights are suggested regarding the layout concept.

• Journal of The Korea Institute of Healthcare Architecture
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• v.26 no.1
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• pp.7-15
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• 2020

Purpose: Emergency room(ER) is the first place to enter a hospital where patients who might have been infected with contagious disease. Therefore, ER should be designed with infection control in mind. Researchers examined hospital ER layouts to identify layout design that support infection control. Methods: This study analyzed the hospital ER layout of Korean and other hospitals abroad. Researchers focused on route of incoming patients who potentially have infectious disease. Crossing of this route with other routes such as for imaging and testing should be avoided for infection control. Results: There were certain hospital ERs with better control of infection related incidents. ER floor plan layout is analyzed about allocation of key functions with movement routes for each role such as patients and medical staff in mind. To identify layout strategies for ER functions researchers simplified the routes in ER into diagrams. Layout options show that bypassing infection suspected routes over other routes is possible. Implications: Hospitals can control infection easier when they adopt strategic ER layout identified in this study.

• Journal of Practical Engineering Education
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• v.16 no.4
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• pp.459-469
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• 2024

Optimizing text entry in extended reality (XR) is important. However, most studies have focused on inputting alphabetic characters, so there is still insufficient research on inputting Korean characters. As a follow-up to our previous research, this paper deals with the effects of keyboard layout and augmented position on Korean text entry in the XR environment. For this purpose, we developed a virtual keyboard environment using the representative Korean keyboard layout "Du-Beol-Sik" across three augmented positions: mid-air, physical planar surface, and palmar surface. After conducting an experiment, we analyzed the effects of keyboard layout and augmented position on text entry by comparing the results of our previous research (the effect of augmented position on text entry based on the international standard Korean keyboard layout 'Chon-Ji-In'). The analysis results confirmed that the virtual keyboard performed the best overall when augmented in mid-air regardless of the keyboard layout. It was also confirmed that the keyboard layout had little effect on text entry. Based on detailed analyses, we suggest directions for providing a virtual keyboard for Korean text entries in the future.

• Proceedings of the ESK Conference
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• 1995.10a
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• pp.172-181
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• 1995

A control panel layout system was developed to generate an ergrnomically sound panel design. A constraint satisfaction concept was introduced as a framework of incorporating diverse ergonomic design guidelines into the panel layout. An efficient search algorithm which can find a constraint satisfaction solution within a reasonable time was developed based on preprocess and look ahead procedures with the backjumping technique. The proto- type panel layaout system was developed on a SPARC workstation. The constraint satisfaction algorithm was programmed in C language with Motif as a GUI tool under the X-windows environment. The effectiveness of the prototype paned layout system was examined by a case study.

• IE interfaces
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• v.6 no.1
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• pp.67-86
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• 1993

This study presents a fuzzy set-theoretic approach for preparing a from-to chart and a relationship chart in order to increase system effectiveness through the proper layout planning. Though there have been a number of studies on the layout planning, they have been not well applied in industries because of difficulties in preparation of the two charts. In this study, a fuzzy mag count as a transportability measure is suggested, and the procedure for preparing two charts is explained on the basis of the count. Finally, this approach is applied to the layout planning of a ship repair shop.

• IE interfaces
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• v.6 no.1
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• pp.87-97
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• 1993

In this paper, the plant layout planning is optimized at the K-area of the K-airline. The K-area includes 15 activies. The initial solution is found qualitatively by designing a space relationship diagram for the relationship. The cost of material handling is minimized by finding the final layout plan using CRAFT. In comparing to the master plan of K-airline, the final layout plan in this research can reduce the cost of material handling by 52%.

• Journal of the Korea Society for Simulation
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• v.3 no.1
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• pp.99-105
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• 1994

Most of the companies are forced to cut down the manufacturing cost to survive in the competitive environment. Among others, material distribution cost alone takes substantial portion of the total manufacturing cost. In this study, we investigate the waiting phenomenon in the toll gate and propose a new toll booth layout to reduce the waiting time, thereby reduce the total material distribution cost. SIMAN, a simulation language, is employed to evaluate the proposed layout. The experimental results show that the layout reduces the waiting time significantly. Furthermore, the result indicates that determination of the intermediate buffer space affects the performance of the proposed layout.