• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2001.05a
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• pp.75-80
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• 2001

• Journal of the Korean Society for Precision Engineering
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• v.19 no.10
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• pp.120-129
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• 2002

An integrated structure and controller design approach for rotating cantilever beam is presented. An optimization method is developed for improving positioning performance considering the elastic deformations during high speed rotation and adopting the beam shape and the control gains as design variables. For this end, a dynamic model is setup by the finite element method according to the shape of the beam. The mass and stiffness of the beam are distributed in such a way that the closed-loop poles of the control system should be located leftmost in the complex s-plane. For optimization method, the simulated annealing method is employed which has higher probability to find the global minimum than the gradient-based down-hill methods. Sequential design and simultaneous design methods are proposed to obtain the optimal shape and controller. Simulations are performed with new designs by the two methods to verify the effectiveness of the approach and the results show that the settling time is improved for point-to-point position controls.

• Journal of Computational Design and Engineering
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• v.2 no.1
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• pp.16-25
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• 2015

Since construction projects are large and complex, it is especially important to provide concurrent construction process to BIM models with construction automation. In particular, the schematic Quantity Take-Off (QTO) estimation on the BIM models is a strategy, which can be used to assist decision making in just minutes, because 70-80% of construction costs are determined by designers' decisions in the early design stage. This paper suggests a QTO process and a QTO prototype system within the building frame of Open BIM to improve the low reliability of estimation in the early design stage. The research consists of the following four steps: (1) analyzing Level of Detail (LOD) at the early design stage to apply to the QTO process and system, (2) BIM modeling for Open BIM based QTO, (3) checking the quality of the BIM model based on the checklist for applying to QTO and improving constructability, and (4) developing and verifying a QTO prototype system. The proposed QTO system is useful for improving the reliability of schematic estimation through decreasing risk factors and shortening time required.

• Transactions of Materials Processing
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• v.12 no.1
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• pp.18-25
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• 2003

This paper explains the process design for improving tool life in the conventional hot forging process. The thermal load and the thermal softening are happened by contact between the hotter billet and the cooler tools in hot forging process. Tool life decreases considerably due to the softening of the surface layer of a tool was caused by a high thermal load and long contact time between the tools and the billet. Also, tool life is to a large extent limited by wear, heat crack and plastic deformation in hot forging process. Above all, the main factors which affect die accuracy and tool life we wear and the plastic deformation of a tool. The newly developed techniques for predicting tool life are applied to estimate the production quantity for a spindle component and these techniques can be applied to improve the tool life in hot forging process.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.16 no.2
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• pp.63-69
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• 2007

The surface roughness in centerless grinding is mainly affected by the many process parameters. For improving the surface roughness, the control of grinding parameters is very important. This paper deals with the analysis of the process parameters such as height of renters, tilting angle of the regulating wheel with respect to grinding wheel, rotation speed of regulating wheel, which are developed based on design of experiments such as factorial design. The investigation can enhance the surface roughness of ferrule. Finally, we have verified improved results of the optimized conditions.

• Korean Journal of Construction Engineering and Management
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• v.2 no.4 s.8
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• pp.144-156
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• 2001

This study aims at improving the limitations of current construction processes. Previous solutions to improve construction processes have been focused on the improvement of local processes. This paper proposes a method to improve global effectiveness of construction processes through ascertainment of communication among the process participants. This paper provides two case studies: Deck plate installation processes and Duct installation processes. The case study illustrates a way to improve global effectiveness by incorporating downstream participants such as specialty contractors in upstream construction processes such as design and planning.

• Journal of the Korean Institute of Educational Facilities
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• v.15 no.6
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• pp.47-54
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• 2008

Because the use of furniture have changed importantly, the relationship between general classroom in primary school and using furniture has got more important than before. There are two distinctive in furniture of general classroom. One is the improving the quality of education environment, and another is the improving the effect of studying. Therefore, the goal of this study is to change the function of general classroom for goal of these two characteristic. Through this study, the goal of this study make a future vision of better furniture design of general classroom.

• IEMEK Journal of Embedded Systems and Applications
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• v.6 no.5
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• pp.273-280
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• 2011

In this paper, we describe the structural reinforcement approach of the throwing-type firefighter assistance robot which can be thrown into a fire site to monitor inside the place and search trapped people while ensuring a firefighter's safety. The reinforcement design is focused on high strength with low weight for the robot. The in-depth structural analysis of the platform is carried out to track down the weakest part, especially with the 1.8m height of drop test. The analysis is verified by comparing with the 1.8m height of the drop test of the throwing-type firefighter assistance robot. The optimal approach for improving the strength of the weakest part aims at topological equivalent and equivalently stress distributed shape.

• Journal of the Korea Convergence Society
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• v.8 no.7
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• pp.23-28
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• 2017

For manufacturing industry to achieve efficient manufacturing process, improving a company's productivity and reducing cost is a required task of the current manufacturing companies. For design of efficient manufacturing process and improvement of productivity, efficient manufacturing process method is studied through removal of unnecessary elements analyzing motions and using test-bed linkage system based on virtual reality. When building process line after verifying optimization through virtual process arrangement simulation in advance, it is available to save additional cost for process modification or supplement to result in practical effects of improving a company's manufacturing competition. Reducing design period, improving equipment, making automation, realizing ergonomics, and improving process through this study, it will be available to achieve improvement of productivity, enhancement of quality, cost reduction as well as employees' satisfaction for safety and health.

• Journal of Engineering Education Research
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• v.13 no.1
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• pp.62-69
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• 2010

Program learning outcome is widely used for assessing and improving program quality. There are various methodologies that can measure program quality and improve program learning outcomes. In this paper, we used formative approach in Capstone design course, since it is the most effective in terms of improving program learning outcomes due to the course's intrinsic nature. To integrate a formative approach into Capstone design course, we develop a feedback structure which is a key element in formative approach and define several sub phases that manage feedback structures and their own evaluation criteria. As a result, we observed a noticeable improvement for students performance in capstone design course.