• 반도체디스플레이기술학회지
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• 제18권4호
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• pp.75-80
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• 2019

One of the most critical aspects of the smartphone industry is the quality of the cover. And the vibrations of machining center are supposed to be the most dominant factors to damage the cover quality. In this study, structure of a machining center has been analyzed through experiments and computer simulations to figure out the main reasons of the vibrations. And the design alterations based on the analysis were applied to identify the effects of those alterations on the vibration suppression. The result shows that the design alterations can effectively suppress about 90% of the vibrations.

• 반도체디스플레이기술학회지
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• 제18권3호
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• pp.88-92
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• 2019

Automotive industry requires high technologies to stabilize apparatuses for the EGR valve manufacturing. Vibrations of washing machine are one of the most critical factors for causing unwashed products, which are the main reasons of the defects.In this study, the structure of the washing machine was analyzed through the experiment and the computer simulation to investigate the main reasons of the vibrations, and further to alter the design for the improved stability. And the design alterations were applied to the machine to identify the effects of those alterations.The result of the study shows that design alterations of the washing machine can effectively suppress about 85% of the vibrations, and further can minimize the unwashed EGR valve.

• 반도체디스플레이기술학회지
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• 제20권2호
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• pp.14-18
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• 2021

Electric Vehicle industry requires high technologies to stabilize apparatuses for the Coolant heater manufacturing. Vibrations of Leak Machine are one of the most critical factors for causing delivered of the defective product or poor inspection, which are the main reasons of the defects. In this study, the structure of the Leak Machine was analyzed through the experiment and the computer simulation to investigate the main reasons of the vibrations, and further to alter the design for the improved stability. And that design alterations were applied to the machine to identify the effects of those alterations. The result of the study shows that design alterations of the Leak Machine can effectively suppress about 97.8% of the vibrations, and further can improving the Inspection precision of the Coolant heater.

• 반도체디스플레이기술학회지
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• 제18권3호
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• pp.82-87
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• 2019

One of the most critical aspects of the semiconductor industry is the quality of the wafer surface. And the vibrations of wafer grinder are supposed to be the most dominant factors to damage the wafer surface quality. In this study, structure of a wafer grinder has been analyzed through experiments and computer simulations to figure out the main reasons of the vibrations. And the design alterations based on the analysis were applied to identify the effects of those alterations on the vibration suppression. The result shows that the design alterations can effectively suppress about 90% of the vibrations.

• 반도체디스플레이기술학회지
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• 제15권1호
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• pp.56-64
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• 2016

It is generally accepted that the surface quality of wafer edge is mostly damaged by the vibrations of the edge grinding machine. The surface quality of wafer edge is supposed to be the most dominant factor of the cracks, scratches, burrs and chips on the edge surfaces, which are the main defects of the wafers. In this study, the structure of a wafer edge grinder has been investigated through the frequency response experiment and the computer simulation to find ways to suppress the vibrations from the structure. The main reasons of the structural vibrations were analyzed. And further the design alterations were deduced from the results of the experiment and the simulation, and applied to the machine to check the effects of those alterations and to eventually improve the structural stability. The result shows that the machine can have much improved stability with relatively simple design changes.

• 반도체디스플레이기술학회지
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• 제17권3호
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• pp.53-58
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• 2018

The modern industry requires the precision machining as well as the high productivity. The machine tool structure should be evaluated in aspects such as durability, static stability, precision rate and the dynamic stability which is one of the most critical characteristics in determining the magnitude of vibrations. In this study, the dynamic properties of a pipe cutting machine were investigated to analyze the structural vibrations of the machine, and further to improve the structural stability and precision machining. Frequency response test and computer simulation have been utilized for the analysis and the design alterations. And the result shows that proposed design alterations can reduce the vibrations of the machine substantially.

• 반도체디스플레이기술학회지
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• 제18권2호
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• pp.23-28
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• 2019

Wire breakage in drawing, which is the most critical process in glass fiber manufacturing, is caused by numerous factors such as height, drawing speed, and air flow. The vibrations of the draw tower, however, is the most dominant factor to create the wire breakage. In this study, the structure of a draw tower has been analyzed through experiments and computer simulations to figure out the main reasons of the vibrations. And the design alterations were applied to the machine to identify the effects of those alterations. The result shows that design alterations of the draw tower structure can suppress the 87% of the vibrations, and further can prevent the wire breakage.

• 한국주거학회논문집
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• 제13권1호
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• pp.44-52
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• 2002

As a result of the expansion of the nuclear family in society, there has been an increase in the number of elderly people who want to live independently of their children. Australia is one of the countries which has initiated an extensive welfare program for its senior citizens. These services include maintenance of, and alterations to their own homes to make living conditions safer and more manageable. This case study was aimed at finding ways of adapting the services provided in Australia, to meet the needs of elderly Koreans who are in similar situations. It evaluated houses which had been renovated and altered fur the normal as well as the disabled elderly in both Melbourne and Sydney. results of research were as following : 1) Most elderly usually wished to remain as long as possible in their own home and it made them very stable in psychologically. 2) Housing maintenance and alterations were provided as one of social care services fur elderly with low expense and loan from government. 3) Many elderly were also getting various kinds of social services, fur example, meals on wheels, transportation and cleaning service with housing alterations and these ones let their quality of life more improved. 4) Occupational therapist and Architect were always involved in the process of housing alterations for disabled elderly. 5) The alterations which related to bathroom, toilet and steps were very popular and those were considered essential design guide applications for planning of housing for elderly in the future.

• 대한가정학회지
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• 제39권10호
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• pp.39-53
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• 2001

Housing is the most important factor for the elderly and the disabled to live safely and independently. If they want to stay in their familiar community as long as possible, to support their stay in their house must be needed. The purpose of this study was to investigate the housing alterations for the elderly and the disabled. To accomplish the purpose of this study, three cases that had altered housing to fit their needs in three countries, were selected. In Korean case of alterations for the disabled, bathroom and kitchen were the altered spaces in the house. But active alterations were not done, because of the limited expense for the alterations and housing ownership, rented. In one case of housing construction for the elderly in Japan, there was no level difference in the interior. Two bedrooms were provided for the husband and the wife, because of the difference of time to bed. The sunroom for enjoying the outside of the nature was provided. In swedish case, due to the supports of the government and local authority, the house was altered at many spaces such as bathroom, kitchen, ramp at the entrance, elevator and so forth. In conclusion, sufficient supports of government and community services can increase the housing quality of people. The ultimate goal of housing alterations must be done not for the elderly and disabled but for all people.

• 반도체디스플레이기술학회지
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• 제16권1호
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• pp.91-96
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• 2017

One of the most critical aspects of the modern semiconductor industry is the quality of wafer surface, the roughness of which is mostly caused by the ingot slicing. And the grinding is supposed to be the main process to reduce the surface roughness. The vibrations of the disc surface grinder are the major problem to effectively achieve the required surface quality. In this study, the structure of a disc surface grinder was analyzed through the experiment and the computer simulation to investigate the dynamic characteristics of the machine, and further to alter the design for the improved stability. The result of the study shows that simple design alterations without alternating main body can effectively suppress the vibrations of the machine.