• Journal of Energy Engineering
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• v.20 no.3
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• pp.224-230
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• 2011

For developing high performance fuel cell, peripheral devices and key components have to be studied in priority. In this study, centrifugal pump was studied for heat recovery. For PEM fuel cell system, a four-impeller centrifugal pump was designed, tested and compared with result of commercial product (IWAKI). In addition, effects of number of impeller were analyzed by CFD. The experiment and analysis were progressed in the same conditions. The results showed the quantitative difference under 30% between the numerical and the experimental pressure difference and mass flow rate.

• The Journal of the Korea Contents Association
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• v.13 no.6
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• pp.496-506
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• 2013

This paper aims to suggest the problems of land-use plan which causes the lack of parking space and to study the improvement of the problems. The land-use plan and the parking plan of the Gyo-dong 2 land development project are examined and the land use and the parking conditions are surveyed. The major cause of parking problem is not to have planned land use realistically. Because of the non-realistic land use plan, the parking demands are underestimated and it has resulted in decreasing the supply of parking space. In addition, the land use and parking managements have been negligent since the land development. In order to improve the parking problem, the change of land use should be considered in land use plan. And actual land use and parking plans should be made and land use management which considers the change of parking demands should be practiced.

• The Journal of the Korea Contents Association
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• v.18 no.4
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• pp.688-697
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• 2018

The following research was conducted to encourage residents in urban areas to move to rural areas, and to improve the residential environments in those rural areas. Current policies for rural village development Project were analyzed, and policy implications were proposed. Residents in rural villages participated in a 12-question survey that asked their priorities prior to moving to the area, and factors contributing to resident satisfaction. Importance and Performance Analysis (IPA) was performed to present potential development strategies in the construction business. As a result, 'natural environment and landscapes' had the highest priority and satisfaction, whereas 'lack of public transportation and accessibility' and 'road conditions and parking facilities' had high priorities but low satisfaction levels. Thus, it is important to take nature and environment, as well as accessibility into consideration when moving to rural villages. Although this research was based on residents' bias, and the sample area was limited, these conclusions still offer important policy agreement provide of future rural villages location selection and establishment of land use planning.

• Korean Journal of Human Ecology
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• v.21 no.5
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• pp.957-973
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• 2012

This study analyzed consumer public complaint behaviors and the satisfaction of complaint handling among credit card users who availed of credit card services. Relatively little research has been done in this area, despite the obvious importance of understanding and improving credit card market conditions. The purpose of this study was to examine consumer compliant behaviors with a focus on public actions, such as voice responses and the third party actions among credit card users. With the goal of providing consumers with more positive expectations of credit card companies' complaint handling process, this study investigated the status of public actions and the negative effect of complaints on the overall satisfaction of post-complaint behavior toward credit card services. The responses from 1,000 credit card users were analyzed using descriptive analysis, factor analysis, multi-logit analysis, and Heckman selection estimate. The analysis provided three major results: (1) perceived service quality among credit card users was conceptualized into groups such as responsiveness, innovation, company, additional service, and fee, (2) perceived service qualities, age, residential area, employment status, and subjective economic status had significant effect on public compliant action behaviors, and (3) unidimensional factors resulting from post-complaint behaviors were analyzed and several variables, such as period of credit card use, average amount used, and perceived service quality had significant effects on the degree of satisfaction associated with complaint handling in terms of credit card services. Several implications and directions for further research are discussed.

• Structural Engineering and Mechanics
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• v.58 no.2
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• pp.277-300
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• 2016

Cold-formed steel (CFS) sections are becoming an increasingly popular solution for constructing floors in residential, healthcare and education buildings. Their reduced weight, however, makes them prone to excessive vibrations, increasing the need for accurate prediction of CFS floor modal properties. By combining experimental modal analysis of a full-scale CFS framed building and its floors and their numerical finite element (FE) modelling this paper demonstrates that the existing methods (based on the best engineering judgement) for predicting CFS floor modal properties are unreliable. They can yield over 40% difference between the predicted and measured natural frequencies for important modes of vibration. This is because the methods were adopted from other floor types (e.g., timber or standard steel-concrete composite floors) and do not take into account specific features of CFS floors. Using the adjusted and then updated FE model, featuring semi-rigid connections led to markedly improved results. The first four measured and calculated CFS floor natural frequencies matched exactly and all relevant modal assurance criterion (MAC) values were above 90%. The introduction of flexible supports and more realistic modelling of the floor boundary conditions, as well as non-structural $fa{\c{c}}ade$ walls, proved to be crucial in the development of the new more successful modelling strategy. The process used to develop 10 identified and experimentally verified FE modelling parameters is based on published information and parameter adjustment resulting from FE model updating. This can be utilised for future design of similar lightweight steel floors in prefabricated buildings when checking their vibration serviceability, likely to be their governing design criterion.

• Journal of the Korean housing association
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• v.26 no.1
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• pp.1-10
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• 2015

In line with the recent public concern on the environmental issues in building industry, there has been a rise in demand for a healthy, sustainable housing environment in South Korea. In order to achieve a healthy environment in residential buildings, considerable efforts have been made in a wide range of sectors. Among others, the development of the certification schemes to promote environment-friendly planning and building construction is remarkable. In urban South Korea, recently built houses tend to be significantly high-rise, high-density buildings. Global warming has brought about drastic climate change and continued to increase the average annual temperature year by year. These changes should be well reflected on the government's implementation of the building environmental assessment system. For guidance, therefore, this study looks to the case of Hong Kong which is well known for high-density housing development and subtropical climate conditions. It compares the features of the green building certification schemes for newly developed multifamily housing in two regions, namely HK-BEAM in Hong Kong and G-SEED in South Korea. Based on the findings, it argues that the G-SEED implementor should have expanded roles in providing training programs and follow-up services in collaboration with the certification authorities. It is also argued that G-SEED professionals should be involved in the early stages of design processes, and training programs and licence systems to produce green building professionals should be developed. Finally, it points out that the assessment indicators should be more detailed and diversified.

• Journal of Hydrogen and New Energy
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• v.20 no.5
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• pp.384-389
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• 2009

KEPRI (Korea Electric Power Research Institute) has studied planar type solid oxide fuel cell (SOFC) stacks using anode-supported cells and kW class co-generation systems for residential power generation. In this work, a 1 kW SOFC system consisted of a hot box part, a cold BOP (balance of plant) part, and a hot water reservoir. The hot box part contained a SOFC stack made up of 48 cells, a fuel reformer, a catalytic combustor, and heat exchangers. Thermal management and insulation system were especially designed for self-sustainable operation in that system. A cold BOP part was composed of blowers, pumps, a water trap, and system control units. When the 1 kW SOFC stack was tested using hydrogen at $750^{\circ}C$, the stack power was about $1.2\;kW_e$ at 30 A and $1.6\;kW_e$ at 50 A. Turning off an electric furnace, the SOFC system was operated using hydrogen and city gas without any external heat source. Under self-sustainable operation conditions, the stack power was about $1.3\;kW_e$ with hydrogen and $1.2\;kW_e$ with city gas respectively. The system also recuperated heat of about $1.1\;kW_{th}$ by making hot water.

• Journal of the Korea Fashion and Costume Design Association
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• v.17 no.3
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• pp.197-206
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• 2015

Ghetto was originated from the concept of "Jewish Camp", the segregated Jewish residential area, and recently it refers to the black neighborhoods of the poor living conditions or slum. A region to form a unique culture distinguished from the adjacent area is also called as ghetto. The culture born in that region is called "ghetto culture", and from the cultural aspect it can mean a type of haven that allows the freedom and deviation of their own. In this study, the generating background and the characteristics of ghetto style especially to adolescents were examined, and celebrities' unique fashion styles that lead the public in the fashion diffusion process were analyzed. Through this, Ghetto culture was understood and the effects of the mass culture phenomena on fashion, symbolization, and an aesthetic value were examined. With this, it aims to help understand the effect of special local culture like "ghetto" on modern fashion and expand the design area. As a result of this study, the characteristics of ghetto style were as followings; 1. It is based on hiphop style; 2. The name brands are exposed conspicuously; 3. Caught eyes by unusually excessive decorations; 4. It expresses confidence and toughness through fashion beyond the resistance to the target who suppresses and humiliates themselves; 5. Ghetto culture is rapidly spread through media. To conclude, ghetto style is an expression of hope of the poor that they can gain wealth through impressing the public and drawing empathy just by their talent. Furthermore, ghetto style is an important cultural trend that has appeared as their wannabe and a powerful display method to express success.

• Journal of the Korean Institute of Rural Architecture
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• v.18 no.1
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• pp.11-18
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• 2016

The purpose of this study is to analyze the characteristics for the needs of rural residents and return farmer on rural rental housing. Through these rural rental housing as it wants to improve the living environment of rural areas. Housing problems of rural areas is one of the important factors that determine the quality of life in rural areas. Despite many rural development program it has been deteriorating housing conditions in rural areas. The purpose of this study aims to find the required characteristics of the rural residents and return farmer for rental housing system introduced in rural areas. As research methods, the survey it was required to rent the properties rural residents and expectant return farmer. The main analysis results are summarized as follows. First, expectant return farmer than rural residents are more flavors of rental Residential high. Second, rural residents prefer ratio was higher this apartment, expectant return farmer appeared to prefer the house. Finally, rural residents may prefer concrete homes, expectant return farmer appeared to favor the wooden houses. The results of this study can be a basis for effective strategies for future rural rental housing. More sustainable in the future, including the analysis of various parameters in progress by being linked to policy measures that will be provided. This study aims to be the foundation of sustainability in rural rental housing policy.

• Journal of the Korean Institute of Rural Architecture
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• v.15 no.1
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• pp.21-28
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• 2013

Problems of housing, healthcare, social exchanges, and lonely feelings of vulnerable social groups such as the elderly living alone in rural and fishing villages should be resolved by guaranteeing minimum residential rights and levels to restore the sense of self-esteem and social stability and to maintain the rural communities and these should be the object of social interest and support. The housing problems of rural and fishing villages should be resolved not through supply to meet demand but by beginning with providing the ways to attain mutual interaction through the program that recognizes housing as merit goods to maintain the regional communities This research examines more minutely the problems caused by poor housing conditions of rural and fishing villages and attempts to present rural and fishing village type community living home as an alternative through regeneration. The results of this research are as follows. First, the administrative support system should be built to support the community living home in its beginning, process, completion, and even post management. Second, education for reinforcing capabilities to help understand the community living home should continually conducted on the occupants, villagers, and related organizations. Third, in order to expand the community living home, research and development should be made so that the zero-energy house, the alternative energy utilizing house, etc. can be widely used. In building community living home for vulnerable social groups in rural and fishing villages, practical alternatives suitable to the regional realities should be presented and practiced so that the community living home can be built to the satisfaction of all the villagers and the occupants, and the improvement measures should be presented through constant interest and monitoring.