• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.10
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• pp.24-31
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• 2006

In this paper, mechanical behavior of unidirectional composites with flexible matrix was predicted by geometrical non-linear finite element analysis. Two typical idealized unit cells of square and hexagonal fiber arrays were modeled and these were subjected to different loadings. The stress-strain behavior of composites was predicted from which the effective properties were calculated. The hyperelasticity of polyurethane matrix was considered using Mooney-Rivlin model. In result, the stress-strain behavior of flexible composites shows non-linearity, especially it is remarkable under transverse normal and shear loading conditions. In this cases, there are great difference between square and hexagonal fiber array models.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.39 no.8
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• pp.711-718
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• 2011

The thermoelastic behavior of the porous carbon/phenolic composites is studied using the thermomechanical response model of chemically decomposing composites. The model includes thermal dependence of the porous composites, porosity in the pyrolysis process, pore pressure due to decomposing gases, and shrinkage. The poroelastic coefficients are calculated based on representative volume element model and finite element analysis. The internal stress distribution caused by pores and pore pressure, and the overall deformation are verified. The effects of the poroelastic coefficients on the thermoelastic behavior are examined through numerical experiments.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2008.11a
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• pp.305-310
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• 2008

In Korea, a movement for founding space for women has been popular to improve the individualistic living environment. However, Consideration for male is laking in housing space. The purpose of this study is to: 1) analyze living status, using behavior of housing space, and actual state and need for male space, 2) plan apartment unit focused on specialized features for male residents. The study collected data from 108 men who were 30 years and older. The result of the study show that men were in need of consideration for a life of leisure, homeworking and household chores in dwelling space. Besides, most male residents didn't have their space even though they wanted it.

• Steel and Composite Structures
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• v.24 no.3
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• pp.383-391
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• 2017

The goal of this study is to investigate structural analysis and behaviors of an innovative aerial work platform truss frame whose ductility is improved by using high strength-steel UL-700. The present space truss frame can move or stop through tunnels for maintenance constructions by automatic facilities and workmanship within standardized limited building lines of tunnel. Most of all, this method overcomes problematic, which is to block cars during construction periods, seriously, of typical methods like as using truck and scaffolds for tunnel maintenance. According to evaluated appropriate design results of space truss frames of numerical examples by using a commercial MIDAS GEN program, it is verified that design parameters such as layered size, cross-sectional size, and steel material of the present space truss frame are determined to depend on characteristics such as lanes or shape of road tunnels.

• Steel and Composite Structures
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• v.24 no.4
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• pp.513-521
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• 2017

The goal of this study is to investigate structural analysis and behaviors of an innovative aerial work platform truss frame whose ductility is improved by using high strength-steel UL-700. The present space truss frame can move or stop through tunnels for maintenance constructions by automatic facilities and workmanship within standardized limited building lines of tunnel. Most of all, this method overcomes problematic, which is to block cars during construction periods, seriously, of typical methods like as using truck and scaffolds for tunnel maintenance. According to evaluated appropriate design results of space truss frames of numerical examples by using a commercial MIDAS GEN program, it is verified that design parameters such as layered size, cross-sectional size, and steel material of the present space truss frame are determined to depend on characteristics such as lanes or shape of road tunnels.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.50 no.7
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• pp.465-470
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• 2022

This paper studied the high-velocity impact behavior characteristics of metal materials by crosschecking the high-velocity impact analysis with the high-velocity impact experiment results of aluminul 6061. The coefficients of the Huh-Kang material model and the Johnson-Cook fracture model were calculated through quasi-static using MTS-810 and dynamic experimenting using the Hopkinson bar equipment for high-velocity impact analysis. The penetration velocity and shape were predicted through high-velocity impact analysis using the LS-DYNA. The resultes were compared with the experiment results using a high-velocit experiment equipment. It is intended to be used the containment evaluation research for aircraft gas turbine engine blade.

• Archives of design research
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• v.19 no.5 s.67
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• pp.75-84
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• 2006

The aims of this study are to examine the conceptual contents of space diagram, and to find its elements and practical applications by analyzing the UN Studio. The Findings of this study are as follows: firstly, the conceptual contents represented in space diagram are classified into four elements - motif, flow, relationship, and distribution. Secondly, space diagram is used in program development, schematic design, and preliminary design of design process phases. Thirdly, the elements based on the case diagrams include five elements: context analysis, object analysis, time-behavior analysis, modeling analysis, and space analysis. Fourthly, in practical use, diagrams with motif concept is usually used in modeling analysis, and diagram with flow concept is commonly used in the analysis of time-behavior and object. Diagrams with relationship concept is mostly used in space analysis, secondly in analysis of context and modeling. Further, diagrams with distribution concept is usually used in space analysis. If one uses these findings for design projects in practical business or education, it would be helpful in design conception and development as well as of design information structuralization.

• Journal of the Korean housing association
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• v.12 no.4
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• pp.19-31
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• 2001

The purpose of this study is to investigate the meaning and the function of the shared space in the existing multi-family housing through analyzing the reality and resident's requirement for it, and additionally to develop the research project to investigate its activation strategy. The method of this study was through analyzing the related literature and the existing study. The followings were found out from this study concerning the shared space: 1) Both the supplier and resident of multi-family housing started to recognize the importance of its role with relation to the quality of the home environment. 2) In residents' requirements for it, there was its common elements, and selective differences according to the size of housing, life cycle, and whether housewife has a job or not etc. 3) In order to activate the shared space, we need to search abut using behavior for that, its flexibility of housing regulations, and to develop an effective management program. Finally this study emphasized on the necessity of planning focused on the shared space for the community design in multi-family housing.

• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.29.2-29.2
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• 2008

The CCD photometric observations of the W UMa type contact binary GX Aur were performed for 33 nights from 2004 to 2008 using a 2K CCD camera and Johnson BVRI filter system attached to the 61cm reflector at Sobaeksan Optical Astronomy Observatory (SOAO). From our observations, the first BVRI light curves of GX Aur were completed and eight new times of minima (primary: 4, secondary: 4) were obtained. All the times of minima including our timings were collected and analyzed to see the dynamical behavior of GX Aur system. Intensive analysis of our BVRI lightcurves with the recent Wilson-Devinney binary model shows that GX Aur is an over-contact binary whose component stars have equal mass and time-variable spots.

• Korean Journal of Human Ecology
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• v.17 no.5
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• pp.989-999
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• 2008

The purpose of this study was to supply the basic data for the plan of the storage space in the kitchen by investigating the actual condition of the use and residents' satisfaction. The questionnaires were distributed to 136 families of the local apartment in South Chung-Cheong Province of Korea. The results were summarized as follows; first, among the furniture for storage, the upper and lower space have been installed in every furniture. The general tablewares were stored in the upper part of the kitchen and the frequently used goods for cooking were largely stored in the lower part. Second, in the method of reforming the kitchen space, it showed highest figure in case of purchasing the shelf and there were many cases of storing things by using the subsidiary storage furniture and boxes and it came to the conclusion that the housewives have a tendency to solve the storage problem by using the less expensive, simple and passive ways. Third, in the degree of satisfaction for the space for storage, it showed that the respondents were a little bit dissatisfied with the size of storage space, the position of furniture for storage, the convenience for using and the storage rapacity. Among the furniture for storage in the kitchen, the degree of satisfaction for the upper and lower parts was a little bit low, but it is higher for the others. For the plan of storage space, the aesthetic appreciation reflects visually being in order was considered to be the important factor.