• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.4
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• pp.871-877
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• 2008

It is important to investigate the relationship between weld process parameters and weld bead geometry for adaptive arc robot welding. Howeve, it is difficult to predict an exact back-bead owing to gap in process of butt welding. In this paper, the quantitative prediction system to specify the relationship external weld conditions and weld bead geometry was developed to get suitable back-bead in butt welding which is widely applied on industrial field. Multiple regression analysis for the prediction of process parameters was used as the research method. And, the results of the prediction method were compared and analyzed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.2 no.1
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• pp.1-6
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• 2001

This study is concerned with the cold forging of sintered preform by rotary forging process and direct powder compacting process. An experiment has been carried out using the rotary powder forging press (500kN) which had been designed and equipped with the rotational conical die inclined to the central axis of the press at certain angle The effect of process variables was observed and measured by several mechanical test, such as hardness distribution density, and microstructure of the specimens. It is found that the highly densified P/M parts can be obtained and this process is very effective for improving quality of the powder products.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.1
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• pp.7-12
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• 2010

In this work, optimization analysis has been accomplished to find important process factors for realization of vertical wall around holes punched by the punchless piercing process. Taguchi method was used for optimization analysis. Lemaitre damage theory, one of the ductile fracture models, was also adopted to simulate numerically formation of vertical wall. From the results of analysis the most influencing factor that affects the vertical wall has been revealed to be 'Corner Radius of Die'.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.1
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• pp.107-112
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• 2010

When we design the control system used Programmable Logic controller(PLC), if we program a Sequential Function Chart(SFC), It is easy to understand the sequential flow of control, to maintenance the controller and to describe a program. SFC language is programmed by a single sequence, a select sequence and a parallel sequence. In a select sequence, when the select step is error, the whole process is stopped. If the error step has no connection the whole process, the loss is down when we debugging the program without stopping the whole process. Therefore, this thesis shows the efficient method of remote control for select sequence and we confirmed its feasibility through actual example.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.4
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• pp.2791-2798
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• 2015

The purpose of this study is to suggest Process Reference Model(PRM) for BIM/GIS-based Energy Information Modeling(BG-EIM) efficiently. Through the study, the detail process and consideration were derived to design EIM for the purpose of energy analysis depending on specific use-cases. To do this, we survey related studies and analyze the detailed EIM process. By using the results, BIM/GIS-based energy analysis consideration is defined and BG-EIM PRM is proposed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.2
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• pp.1507-1515
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• 2015

The aim of this study was to suggest an enhancement of pedestrian safety through a service design process regarding urban design in new-town area. For this study, the concept, process and touchpoint, and survey design area, of the service design are reviewed as a theoretical study. According to this study, traffic signals, pedestrian environment, pedestrian overpass, and access traffic road were surveyed as touchpoints and a problem search, concept design, design building, institutional implement were analyzed as a service design process. As a result of these studies, the planning method for pedestrian safety based on service design process in terms of the external space design in a new-town area are suggested.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.11
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• pp.4108-4114
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• 2010

The automation of the machining and manufacturing process of press die is designed to shorten the working time by avoiding unnecessary repetitive works and to obtain subject articles with standard quality. Automation as used in this paper includes 3-D die design, machining center, wire-cut electrical discharge machining, and drawing works. This paper deals with research work on the automation of the machining and manufacturing process of the press die after 3-D die design using the Irp bracket for the control box sensor. The research was conducted under the same setting as that of die design.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.5 no.5
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• pp.442-446
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• 2004

Computer simulation of a swaging manufacturing process is presented in this paper. Commercially available software has been used to develop the simulation algorithm. Based on the experience gained from trial runs, simulation of a tube swaging process has been carried out. The material parameters "n" (strain hardening exponent) and "K" (plastic modulus) are obtained from actual tensile test measurements of the tube material. Two different geometries for the die and the tube have been used in this work and a comparison made. Numerical simulation of the swaging process has been performed using the commercially available HyperMesh(r) for pre-processing, LS-DYNA(r) for analysis and LS-TAURUS(r) for post-processing. Some of the results obtained from this study are compared with those available in the literature.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.4
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• pp.1590-1610
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• 2016

The challenge of penetrating obstacles along with impact from weak multipath effects makes 60GHz signal very difficult to be transmitted in non-line of sight (NLOS) channel. So 60GHz system is vulnerable to obstructions and thus likely results in link interruption. While the application of cooperative technology to solve link blockage problemin 60GHz system should consider the characteristic of directional transmission for 60GHz signal. Therefore in this paper a system is proposed to solve the link blockage problem in 60GHz NLOS communication environment based on the concept of cooperation and also the beamforming technology, which is the basis of directional transmission for 60GHz communication system. The process of anti-blockage solution with cooperative communication is presented in detail, and the fast switching and recovery schemes are well designed. The theoretical values of symbol error rate (SER) using decode and forward (DF) cooperation and amplify and forward (AF) cooperation are presented respectively when the common channel interference exists. Simulation results demonstrate that the performance based on DF cooperation is better than the performance based on AF cooperation when directional transmission is used.

• The Journal of the Korea Contents Association
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• v.18 no.9
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• pp.273-283
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• 2018

The purpose of this study is to examine the degree of cooperation of the spouse perceived by the mother of a handicapped child on parenting stress and find out if there is a mediating effect of parenting efficacy between the degree of cooperation of the spouse and parenting stress. For such a purpose, this study surveyed 145 mothers of handicapped children who are using the day care center exclusive for handicapped children and analyzed their responses. The results show that, firstly, the degree of cooperation of the spouse perceived by the mother of a handicapped child has direct influence on the parenting efficacy. Secondly, the degree of cooperation of the spouse perceived by the mother of a handicapped child has direct influence on parenting stress. Thirdly, there is a mediating effect of parenting efficacy between the degree of cooperation of the spouse and parenting stress, which means that parenting efficacy increases as the mother perceives that she is receiving more cooperation of the spouse in the process of raising the child and the increased parenting efficacy has an influence on the reduction of parenting stress.