Korea Land and Housing Corporation

South Korea

Korea Land and Housing Corporation

South Korea
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Yang H.-S.,Korea Land and Housing Corporation | Kang J.,University of Sheffield | Kim M.-J.,University of Seoul
Applied Acoustics | Year: 2017

A comfortable sound environment in the outdoor spaces of apartment complexes contributes to the improvement of the overall environmental quality. It is expected that the characteristics of room acoustical parameters and sound pressure level (SPL) attenuation of outdoor spaces surrounded by multi-residential buildings depends on many design factors such as the openness, volume, and building layouts, etc. The aim of this study is to clarify the influential factors determining room acoustical parameters and SPL attenuation in outdoor spaces that are surrounded by buildings with complicated topographical conditions. A series of measurements was carried out for 15 outdoor spaces in 6 apartment complexes with different building layouts. The 15 outdoor spaces were categorized into 4 types of building layouts: linear-shaped, parallel-shaped, U-shaped, and square-shaped. The result showed that reverberation time (RT) at 500 Hz and 1000 Hz is relatively long, over 4 s, with uneven RT distribution showing a non-diffuse field. With increasing source to receiver distance, the RT and early decay time (EDT) increased logarithmically. On the other hand, the Definition (D50) and rapid speech transmission index (RASTI) decreased with increasing source to receiver distances. The result for the SPL attenuation measured at a 20 m source to receiver distance in 10 outdoor spaces showed a 17.7 dB difference between the 10 spaces due to the influence of building geometry. An empirical method considering the openness, size-related parameters, and room constant is also suggested to predict the approximate RT and SPL attenuation in the outdoor spaces. © 2017 Elsevier Ltd

Kim H.-R.,Korea Land and Housing Corporation | Chun Y.-S.,Korea Land and Housing Corporation | Lee B.-S.,Korea Land and Housing Corporation | Kim S.-M.,Total Value Solution
Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future | Year: 2016

The wall-slab structure is a common structural system of the apartment building in Asia. The floor slab in the wall-slab structure is shared between the top and bottom units, causing frequent complaints and disputes about the floor-impact noise. Heavy-weight floor impact noises, especially, have become a major source of complaint and a social issue. This study proposes reinforcing the floor slab, using a shear connector to increase the stiffness, as a means of high tuning the heavy-weight floor impact noise. The performance of the proposed floor slab was evaluated by directly applying it in an actual apartment with a wall-slab structure. The test parameter was the installation method of the shear connector, which was installed in directions 1 and 2. The heavy-weight impact noise was evaluated according to the measurement method in KS F 2863-2, the Korean Industrial Standards. The test result showed 47 dB in the living room area, in which the shear connector was installed in direction 1, which was superior to the 50 dB industrial standard. If this customized floor structure can be designed and installed such that the controlled vibration band corresponds to the target frequency, it can effectively reduce the heavy-weight floor impact noise. © 2016, German Acoustical Society (DEGA). All rights reserved.

Chun Y.-S.,Korea Land and Housing Corporation | Lee B.-S.,Korea Land and Housing Corporation | Lee S.-B.,Korea Land and Housing Corporation
Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future | Year: 2016

In this study, vibration and acoustic analyses were carried out for the development of a spatially-customized efficient slab structure that can be applied to diverse apartment sizes and floor plans for reduction of heavyweight impact sound. As a result of these analyses, the plan to use ribbed slab was shown to reduce the heavyweight impact sound most significantly among the three slab structures presented for reduction of the heavyweight impact sound. Though there were some deviations in the amount of impact sound reduced and in the frequency bands, the results of a single number rating showed that a heavyweight impact sound reduction from as little as 1 dB up to a maximum of 4 dB could be expected compared to a bare slab. Further studies need to determine the actual heavyweight impact sound reduction of the ribbed slab structure through a mockup, and the detailed location, size and interval of joist need to be taken into account as well as the influence of mechanical equipment and construction interference. © 2016, German Acoustical Society (DEGA). All rights reserved.

Lee J.-M.,Korea Land and Housing Corporation | Hyun K.-H.,Korea Land and Housing Corporation | Choi J.-S.,Korea Land and Housing Corporation | Yoon Y.-J.,Konyang University | Geronimo F.K.F.,Kongju National University
Desalination and Water Treatment | Year: 2012

Urban development is the primary cause of the expansion of impervious areas. Urbanization reduces infiltration of rainwater, increases runoff volume, and finally has an effect on the hydro-logical cycle and urban environment. To solve these problems, Low Impact Development (LID) methods have been used to restore the natural hydrology of predevelopment sites using site design techniques such as infiltration, evaporation, and retention. SWMM5 has been developed as a model to analyze the hydrologic impacts of LID facilities. This study performed hydrologic analysis and evaluated the flood reduction effect of the Jangjae Stream watershed by the design of LID facilities of the rainwater management demonstration district of AsanTangjung New Town (Korea). LID facilities in this study were comprised of infiltration trench, rain barrel, vegetation swale, etc. SWMM5 was calibrated using rainfall data of the 7th and the 14th of July, 2011 and was verified using rainfall data of the 10th and the 11th of August, 2011. This study analyzed flood reduction effect on 50 to 100 y return period. Based on the results of this study, the reduction of flood peak discharge by each return period of storms was estimated to be about 7 to 15%. © 2012 Desalination Publications. All rights reserved.

Jang S.Y.,Korea Railroad Research Institute | Kim B.S.,Korea Land and Housing Corporation | Oh B.H.,Seoul National University
Cement and Concrete Research | Year: 2011

The purpose of the present study is to explore the diffusion characteristics of cracked concrete according to the width of cracks. Major test variables include crack width, concrete strength, fly ash addition, and maximum aggregate size. The diffusion characteristics have been measured by steady-state migration test. The present study indicates that the diffusion coefficients do not increase with increasing crack widths up to the so-called "threshold crack width." The threshold crack width for diffusion is found to be around 55-80 μm. Above this threshold value, the diffusion coefficients start to increase with crack width. A composite model with the introduction of "crack geometry factor" was derived to identify the diffusion coefficient in cracked concrete. It was shown that the crack geometry factor ranges from 0.067 to 0.206. Finally, the effects of concrete strength, fly ash addition and maximum aggregate size on diffusion coefficients are also discussed. © 2010 Elsevier Ltd.

Choi J.,Korea Land and Housing Corporation | Lee D.,Catholic University of Pusan | Jung H.,Korea Institute of Science and Technology
Lecture Notes in Electrical Engineering | Year: 2014

Different information related to knowledge should be collected and filtered by system in order to discover and integrate knowledge in multiple knowledge representation environment. Especially, various information exist in multiple forms and in separate spaces, such as geographic information, housing statistics, and policy statements, in housing planning doamin. Housing policy support system is needed to make a proper spatial decision for supply housing when housing demand is occured. Thus, this paper proposes a conceptual design of system for knowledge discovery and integration in housing planning support. This system uses GIS based Housing Demand and Supply Mapping Model (HDSMM) to support policy decision using housing statistics and geographic information and to be composed of multi-dimension analysis, policy monitoring functionalities. © Springer-Verlag Berlin Heidelberg 2014.

Lee S.,Oregon State University | Dazkir S.S.,Georgia Southern University | Paik H.S.,Korea Land and Housing Corporation | Coskun A.,Middle East Technical University
Applied Ergonomics | Year: 2014

Healthcare facilities are often complex and overwhelming for visitors, and wayfinding in healthcare facilities can be challenging. As there is an increasing number of global citizens who travel to seek medical care in another country, it is critical to make wayfinding easy for visitors who are not familiar with the language in a foreign country. Among many wayfinding aids, symbols are helpful for those visitors who have limited ability to understand written language. This study tested universal healthcare symbols in the United States, South Korea, and Turkey to compare the comprehension of symbols cross-country and identify predictors of the correct comprehension. To explore statistically significant relationships between symbol comprehension and countries, Pearson's Chi-square tests, logistic regression, and ANOVA were conducted. The test results showed that ten symbols among 14 tested have significant relationship with countries. Results of this study demonstrate that symbol comprehension can be varied significantly in different countries. © 2013 Elsevier Ltd and The Ergonomics Society.

Lee H.,University of Texas at Arlington | Lee B.,Korea Land and Housing Corporation | Park K.,University of Texas at Arlington | Elmasri R.,University of Texas at Arlington
International Journal of Digital Content Technology and its Applications | Year: 2010

Information fused by multi-sensors is an important factor for obtaining reliable contextual information in smart spaces which use the pervasive and ubiquitous computing techniques. Adaptive fusion improves robust operational system performances then makes a reliable decision by reducing uncertain information. However, these fusion techniques suffer from problems regarding the accuracy of estimation or inference. No commonly accepted approaches exist currently. In this survey, we introduce the advantages and disadvantages of fusion techniques which can be used in specific applications. Second, we categorize well-known models, algorithms, systems, and applications depending on the proposed approaches. Finally, we discuss the related issues for fusion techniques within the smart spaces then suggest research directions for improving the decision-making in uncertain situation.

Lee J.-M.,Korea Land and Housing Corporation | Hyun K.-H.,Korea Land and Housing Corporation | Choi J.-S.,Korea Land and Housing Corporation
Water Science and Technology | Year: 2013

An analysis of the impact of a low impact development (LID) on runoff was performed using a Storm Water Management Model 5 (SWMM5)-LID model. The SWMM5 package has been developed to facilitate the analysis of the hydrologic impacts of LID facilities. Continuous simulation of urban stormwater runoff from the district which included the LID design was conducted. In order to examine the impact of runoff in the LID district the first, second and third highest ranked flood events over the past 38 years were analyzed. The assessment estimated that a LID system under historical storm conditions would reduce peak runoff by approximately 55-66% and runoff volume by approximately 25-121% in comparison with that before the LID design. The impact on runoff was also simulated under 50, 80 and 100 year return period conditions. Under these conditions, the runoff reductions within the district were estimated to be about 6-16% (peak runoff) and 33-37% (runoff volume) in comparison with conditions prior to the LID. It is concluded from these results that LID is worthy of consideration for urban flood control in future development and as part of sewer and stormwater management planning. © IWA Publishing 2013.

Lee S.,Purdue University | Paik H.S.,Korea Land and Housing Corporation
Building and Environment | Year: 2011

The rapid industrial and economic development in the recent several decades has caused serious environmental problems in Korea. The country has very limited carrying capacity; the population density in Korea is 481 people per km2, ranking the third-highest in the world [1]. In 1995, the Korean government implemented a volume-based waste fee system (unit pricing system) that required every household to purchase certified plastic bags for waste disposal [2]. Consequently, since the introduction of this regulation, household solid waste in Korea has been substantially decreased, and household recycling has been increased. This study is to examine current Korean household recycling and waste management behavior and explore factors that affect those behaviors. Data was gathered though a survey conducted in Seoul, Korea. For the data analysis, 196 responses were used. The impacts of several factors on recycling and waste management behaviors including NEP (New Environmental Paradigm), attitudes for recycling and waste management, and the respondents' demographic variables were examined. To analyze the data, correlations and multiple regressional analyses were conducted using SPSS 16. The results showed that environmental attitudes affected recycling and waste management behaviors significantly along with several demographic variables. © 2010 Elsevier Ltd.

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