• Transactions of the Korean Society of Mechanical Engineers B
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• v.24 no.11
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• pp.1523-1534
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• 2000

The performance of a number of existing dynamic subgrid-scale(SGS) models is evaluated in large-eddy simulations(LES) of two prototype transitional and turbulent shear flows, a planar jet and a channel flow. The dynamic SGS models applied include the dynamic Smagorinsky model(DSM);Germano et al. 1991, Lully 1992), the dynamic tow-component model(DTM; Akhavan et al. 2000), the dynamic mixed model(DMM;Zang et al, 1993). and the dynamic two-parameter model(DTPM; Salvetti & Banerjee 1995). The results are compared with those for DNS for their evaluation. The LES results demonstrate the superior performance of DTM with use of a sharp cutoff filter and DMM with use of a box filter, as compared to their respect counterpart DSM, in predicting the mean statistics, spectra and large-scale structure of the flow, Such features of DTM and DMM derive from the construction of the models in which tow separate terms are included to represent the SGS interactions; a Smagorinsky edd-viscosity term to account for the non-local interactions, and a local-interaction term to account for the nonlinear dynamics between the resolved and subgrid scales in the vicinity of the LES cutoff. As well, overall the SGS models using a sharp cutoff filter are more successful than those using a box filter in capturing the statistics and structure of the flow. Finally, DTPM is found to be compatible or inferior to DMM.

• Journal of Korean Society of Steel Construction
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• v.17 no.6 s.79
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• pp.707-715
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• 2005

Corrugated webs have been used for composite prestressed concrete box girder bridges. Innovative steel plate girders using corrugated webs have been proposed. It has been found that analytical and experimental researches conducted to determine the strength of trapezoidally corrugated webs can fail with respect to three different buckling modes: local, global, and interactive shear buckling. Shear buckling capacity equations based on classical and orthotropic plate buckling theories have been proposed,but these equations show some differences. In this paper, geometric parameters that influence interactive shear buckling behavior with interaction effects are identified via extensive bifurcation buckling analysis using the finite element meth.

• Journal of the Korean Institute of Rural Architecture
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• v.15 no.4
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• pp.87-94
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• 2013

This study aims to research the characteristics of space composition and location for the rural community center. The phenomenon of urban areas from rural areas by the dismantlement of the community is being increasingly deepened. The current village welfare center in the rural villages of the dismantlement phenomenon of the community in rural areas can not be solved alone. The location of the Community Center in rural villages for the interaction of existing local inhabitants and should be located where possible near existing villages. This thesis studies and analyzes the characteristics of rural villages in the rural new town project districts. The basic function of the community center space analysis model is the Public service space, the Communication space, the Health space, the Amenity space, the Education space(including the childcare). This study analyze the local characterristics, the location type and the floor plan characteristics about the Community Center in rural villages by the rural new town example project.

• Journal of Korean Society for Atmospheric Environment
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• v.18 no.2
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• pp.67-83
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• 2002

The coupled model (SMART) of dynamic meteorology model and particle dispersion model was developed. The numerical experiment on the relationship between change of land use and diffusion behavior in complex terrain was carried out using this model. It tried to investigate the change of particle diffusion behavior and local weather under the condition in which land-land breeze and sea breeze and mountain breeze intermingled. The numerical experiment results are as follows; 1) The more complicated local circulation field of the interaction of sea breeze, mountain breeze and Land -land breeze is formed. Then, the region circulation in which the urbanization is specific by location of the region is strengthened and is weakened. 2) Though in the region with dominant sea breeze, Land-land breeze does not appear directly, the progress of the sea wind to the inland is affected. 3) In the prediction of the air diffusion, emission high quality and accurate information of the emission site are important. That is to say, the dispersion predicting result which emission high quality and small error of the site perfectly vary for Land - land breeze in the effect may be brought about.

• Knowledge Management Research
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• v.15 no.3
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• pp.67-93
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• 2014

The social capital of an organization is recognized as the origin of the knowledge capital creation, and it becomes the mechanisms which explain the interaction of members or which accelerate the behavior of the members to attain the goal of an organization (Park, 2001; Jang et al., 2011). Lots of researches show that this causal relationship empirically exists. Social capital and knowledge capital of an organization are one of the most important competitive advantages that a company needs. They are also the main dynamic drivers of the innovation activity. This study analyzes the relationship and examines the impact and role of an organization's social capital on intellectual capital and innovation activities in an organization. In other words, the main purpose of this study is to analyze the impact of social capital on the intellectual capital and innovation activities of, in particular, China local companies. This study empirically analyzed the survey data collected from the employees of the companies located in China. Our empirical results of this study showed that social capital has significantly causal effects on intellectual capital partially and also showed the intellectual capital has significantly positive effects on the innovation activities partially.

• Journal of the Korean Institute of Rural Architecture
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• v.15 no.2
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• pp.17-24
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• 2013

Recent social aspects such as change in population structure, preference to eco-friendly lifestyle, potential for high-tech agriculture are increasing the public attention to returning to farming and rural areas. Especially, retired people who have a longer life expectancy than in the past seek to find a beginning of their later years in farming and rural life. This phenomenon is expected to form new value on rural areas and create new culture for the aged. In order to suggest a futuristic residential development plan for the retiree, this thesis first analyzes 'MARPA(Maison d'Accueil Rurale pour Personnes Ag$\acute{e}$es)' through reference research, site visit and interview with professionals and based on this suggest solutions applicable to Korean conditions. This thesis concludes that residential development plan apt to local characteristics, marketing strategies and administrative system through network and specialized maintenance system are required. In addition, it is contended that interaction and cooperation with local community, various support on creating regional income and residential development plan being in harmony with existing community are needed.

• Journal of Korean Society of Steel Construction
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• v.13 no.2
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• pp.201-210
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• 2001

A numerical analysis and experimental study were performed to investigate the behavior and strength of tube-gusset connection subjected to axial and lateral forces. To investigate the behavior of the connections, experiment was conducted by applying three directional loads. Local buckling and local plastic bending deformation of the connection were observed from the test. Analytical results were compared with test results for the limited cases. Primary interests here are the effect of eccentricity on the strength of the connection. To suggest a formula for the strength of tube-gusset connection, lateral forces were replaced with equivalent wall moment and eccenrtric vertical component force of lateral force. Ultimate strength formula for the each force was proposed. Finally, nondimensionalized ultimate strength interaction relationships between the wall moment of tube($M_w$), vertical axial force($P_v$), and eccentric vertical component of lateral force($P_e$) were formulated through parametric study.

• Selected Papers of The Society of Naval Architects of Korea
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• v.2 no.1
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• pp.18-28
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• 1994

In the vibration analysis of submerged or floating bodies such as ships and offshore structures, the coupled system between fluid and structure should be considered using the compatibility conditions on the wetted surface. It is well known that the hydroelastic vibration analysis of structures in contact with fluid can be done by applying the finite element method(FEM) to structures and the boundary element method(BEM) to the fluid domain. However, such an approach is impractical due to the characteristics of the fully coupled added mass matrix of fluid on the entire wetted surface. To overcome this difficulty, an efficient approach based on a reanalysis scheme is proposed in this paper. The proposed method can be applied for cases of higher local modes and beam-like modes for which three-dimensional reduction factors are not known. The three dimensional reduction factors are not needled and thus the restrictions can be removed in the analyses of non-beam like modes or local vibration modes by considering fluid-structure interaction. The validity and calculation efficiency of the proposed method are proved through numerical examples.

• Journal of Agricultural Extension & Community Development
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• v.22 no.3
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• pp.245-260
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• 2015

Since the Discussion on responsible tourism sector began in the 1980s, the interest in responsible tourism has increased. Responsible tourism aims to preserve the local culture and environment, and make the benefits return benefits to local stakeholders. This study aims to obtain an empirical understanding of the responsible tourism market by using a segmentation approach to provide better information for responsible tourism marketers in Korea. A self-administered survey was obtained from 471 tourists in seven responsible tourism sites. As for the motivations of responsible tourism, seven factors ('faimly togetherness', 'escape relaxation', 'personal growth', 'social interaction', 'various experience', 'learning' and 'natural experience') were extracted. Six distinct segments were identified based on the motivation: escape from daily life relaxation seekers (19.15%), overall low motivation (7.8%), family togetherness seekers (21.18%). various experience seekers (12.77%), noverlty learning seekers (22.46%) and want-it-all (16.55%). Socio-demographic characteristics and tourism behaviors of each segmentation were also analyzed. The findings should be of interest to practitioners of responsible tourism marketing and operation.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.21 no.5
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• pp.842-849
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• 1997

The aim of this study is an investigation of the interaction of two micro hole defects affecting fatigue crack initation life and propagation behavior. The locatio of two micro hole defects was considered as an angle of alignment and the distance between the centers of two micro hole defects. The fatigue cracking behavior is experimented under bending. When micro defects are located close to each other, the fatigue crack initiation lives are varied with their relative locations. In the experiments, the area of local plastic strain strongly played a role in the fatigue crack initiation lives. Therefore we introduce a parameter which contains the plastic deformation area at stress concentrations and propose a fatigue crack initiation life prediction curve. In addition, the directions and propagation rates of fatigue cracks initiated at two micro hole defects are studied experimentally.