• Design & Manufacturing
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• v.8 no.1
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• pp.27-30
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• 2014

Alloy tool steel such as SKD11 and SKD61 or high speed tool like SKH51 are used as materials for semiconductor dies. Cavities, curl blocks, pot blocks and housings are made from those materials. To make those parts from alloy tool steel or high speed tool, one utilizes discharge machining, and mechanical machining including machining center, milling, drilling, forming grinding and others. In the process of cutting machining and polishing, the die materials become unsuitable for machining owing to bubbles and foreign substances in them, which hinders production process. Therefore, this study focuses on die material selection criteria, and on analysis and comparison of material characteristics to help companies to solve their problems, make die manufacture less burdensome and extend die life.

• Design & Manufacturing
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• v.8 no.1
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• pp.35-39
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• 2014

Window roller housings are durable because high-quality source materials such as stainless steel is used in making them. After a series of precise structure analysis, their design is optimized. They are subject to repetitive driving tests of more 100,000 times, durability tests, impact resistance tests, corrosion tests and others. For a long time, gaps often occur in press molded products owing to serious squareness deformation and flatness deformation of them. Severe burrs in press molded products require frequent grinding, which leads to short life cycle and rough or unreliable movement of assembled roller housing, which, in turn, causes product defects. This study focuses on developing measures to resolve existing defects and to improve lifespan of dies by designing and making a window roller shearing die.

• KIEAE Journal
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• v.8 no.6
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• pp.27-38
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• 2008

Sunlighting offers the high quality of life and has potential to improve environment, economy and human comfort. Especially mirror sunlighting system has competitive power in price, saving energy and solving problems of sunshine lack. This study aims to analyze the adequate applications of mirror type sunlighting systems available in Korea to enhance the living environment. For the purpose, contemporary applications were analyzed by spatial characteristics, size and usage in Germany, Switzerland, Australia, Japan and Korea. As the results, they are being applied for the place with lack of sunshine in housings. For culture complex, they are usually applied for atrium. Nowadays, application of complex systems is increasing to solve sunshine lack and make uniform illuminance. Therefore both aesthetic and technical consideration is needed to apply the advanced mirror sunlighting systems in various spaces.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2000.11b
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• pp.85-89
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• 2000

After 1980's, the progress in quantities of apartments were made by the housing construction expediting policies. But, the qualities of apartments were neglected and the plan of apartments were uniformed by the economical aspects. Apartment unit plans were designed standardized by the reasons of economical efficiency, structural methods and sales. Therefore apartments could not deal effectively with increasing demands for qualities of the residents. Absence of aesthetical values and fixed unit plans on regardless of the residents family compositions and the size of the apartments were occurred. So the new types of the apartment plans are needed to suit the changes and diversities of living. The purpose of this study is to extract the design factors for future apartment by analyzing the unit plans of apartment housings today.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2009.11a
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• pp.162-167
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• 2009

With the introduction of the ubiquitous technology, the housing culture centers of construction companies have demonstrated future housing image and technology. However, ubiquitous home services are technology oriented items. The purpose of this study was to identify u- services which were realized in domestic future housing and to compare those with services the residents needed greatly refer to researches related to demand for u-service. For this study, field studies were conducted with 3 domestic future housings and precedent studies on demand for u-service were analyzed according to the standard of residents' demand. The results of the study showed that residents prefer u-services for security and control of indoor environment for housework and leisure life. As a result, u-services which residents needed mainly did not correspond with those that were displayed in future housing.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2009.11a
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• pp.95-99
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• 2009

To avoid monotony of functionalistic architecture that may be considered the mainstream of modernism architecture, in recent days, the modern architecture displays diversified characteristics. Geometric manipulation method that creates an open space having manipulated a basic geometric shape like hexahedron (cutting out or joining the spatial area onto one side of the figure) is the space manipulation technique that has been introduced and emerged on a full scale since 1970. This technique has been developed as a type of living quarters that has equipped with passive control function, making outside climate flow into the interior. Recently methods for diversified space creation by means of geometry manipulation have begun to appear in domestic low rise multi-family housings other than inflexible box type high-rise building constructions, which comprise the mainstream of multi-family housing.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2011.04a
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• pp.161-166
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• 2011

This research was conducted in order to suggestion management program of Happy house center which facility of detached housings, multi family housing, and semi-detached housing management. This study's purpose is to systematically help create a district customized co-management housing management system among detached housing area by reflecting resident opinion and simultaneously provide basic research. The area of research is Sanjoen district in Ulsan city that compact old detached houses. The research study's results are follows: First, the overall survey results showed that most respondents demanded program of happy house center for housing energy deduction method and support of house insulation cost and heating fuel cost. Second, happy house center try to order of priority or housing maintenance and seek of cost deduction plan. Third, happy house center propose the Maeulmandeulgi(Machizkuri) program or housing management plan for residents' talent contribution.

• Journal of the Korea Institute of Building Construction
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• v.8 no.1
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• pp.71-76
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• 2008

Recently, the high-rise apartment housings have become a prototype of the urban residential dwelling in Korea and the numbers of one have steadily been increasing. According to this trend, the strength of the construction materials is also fortified to assure the stability and durability of the buildings. Specially, Re-bar of SD500 type is largely used at the construction sites of high-rise building. This study analyzes the current usage of SD500 high-strength re-bar at domestic construction sites. Through the result of this analysis, we develop Economic Evaluation Model that measure economic efficiency of lap splice and coupler splice, which are most commonly used in connection SD500. The evaluation method was applied to construction sites in Seoul in December 2006, and the result revealed that coupler splice is relatively superior in terms of cost efficiency when the re-bar diameter is longer and the concrete strength is lower.

• Tribology and Lubricants
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• v.13 no.1
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• pp.70-75
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• 1997

The lubrication characteristics of high-speed ball bearings at oil-starvation have been investigated empirically using the bearings employed in small industrial gas turbine engines. For the close structural simulation, experiments carried our with bearing mounting supports of real engines, such as bearing housings and oil nozzle assemblies with squeeze film dampers. Thus the results of tests can be applied to the design and the development of gas turbine engines. Testing was done by simulating the oil-starvation conditions in engines, such as stopping the oil-supply to the bearing during normal operating, starting without oil-supply at atmospheric temperature, and accelerating with oil-supply at atmospheric temperature. From this study, the relative comparison of the frictional resistance and the resistance due to the bearing cavity oil was demonstrated visually, and the resistance due to the bearing cavity oil was dominant in the resistance of bearing at high speed.

• Journal of the Korean housing association
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• v.12 no.4
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• pp.83-92
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• 2001

The number of aged persons, which would account for 7.1% of total population of 200 year in south korea means that our country would have entered into aging society and that a demand for elderly housing in korea would have been increase rapidly. From this point, this study investigated the present situation of elderly housing in korea, types of those to be provided generally by private and public firms, and the preferred housing types, the location of them and housing sizes of old singles and couples on existing surveys by several firms and organizations. finally, this study suggested several design guidelines to be taken into account in the elderly housings of korea on the basic function of safety, convenience and comfortability and the cultural aspects of leisure life and wealth. Those suggested here will be applied to design guidelines of elderly housing in future.