• Journal of Radiation Protection and Research
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• v.33 no.4
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• pp.173-181
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• 2008

To ensure the performance of radon detectors, three passive radon detectors ($RadTrak^{(R)}$, $Radopot^{(R)}$, and $E-PERM^{(R)}$)have been reviewed. The difference ratios of RadTrak and Radopot tested in the radon standard chamber were -13.2% and -6.0%, respectively, which were in good accordance within 20% of the value measured by $AlphaGUARD^{(R)}$. To ensure the performance of the long term measurement, the 3 detectors were installed at the same position of approximately one hundred of dwellings for one year. The correlation curve between RadTrak and Radopot shows good agreement with a correlation coefficient ($R^2$) of 0.91. However, The correlation curve between E-PERM and Radopot shows bad agreement ($R^2$ = 0.021). In addition, the distribution map of annual mean indoor gamma dose rate measured with E-PERM was not in accordance with the distribution map of outdoor gamma dose rate measured by Portable Ion Chamber. According to the results, some requisites for the selection of the radon passive detectors in the large-scale indoor radon survey were discussed.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.24 no.4
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• pp.518-527
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• 2014

Objectives: The adverse health effects attributed to exposure to radon have been well known over the world. However, the efforts for prevention and mitigation of radon have not been taken in Korea so far. The purpose of this study was to evaluate the effectiveness of mitigation methods applied for various types of houses and public buildings with high level of radon. Methods: Based on the results of "National Radon Survey" performed by the National Institute of Environmental Research(NIER) in 2010-2012, we selected 30 candidate buildings consisting of 20 houses and 10 public buildings with greater than $148Bq/m^3$ of radon level. We measured the concentration of radon in 30 buildings, using E-PERMs and RAD-7 during January to March of 2013. More than five E-PERMs and one RAD-7 per house were installed for seven days. Ten houses and five public buildings were finally chosen to be mitigated after mainly considering the level of radon and the location of buildings nationwide. Three mitigation methods such as Sealing, two types of Active Ventilation(window-shaped and wall-typed ventilations), and Active Soil Depressurization(ASD) were applied, and the concentrations of radon were measured before and after mitigation, respectively. To evaluate the effectiveness of mitigation methods, reduction rates of radon were calculated and Wilcoxon's signed-rank test was performed. Results: The mean concentration of 15 buildings just before radon mitigation was $297.8Bq/m^3$, and most of the buildings were located in Gangwon, Chungbuk, Chungnam, and Daegu areas(73.3%), and built in 1959-1998. The level of radon decreased from 48% to 90% and kept the below recommendation limit of $148Bq/m^3$ after installation of radon mitigation. Among mitigation methods applied, the reduction rate(58.7-90.4%) of radon attributed to ASD was the greatest than that of other methods, followed by Active Ventilation(48.4-78.4%) and Sealing(<22%). The effectiveness of radon reduction by window-shaped Active Ventilation(63.2-75.2%) was relatively better than that of wall-typed Active Ventilation(48.4-54.3%). Conclusions: The results of this study indicate that ASD could be more effective for radon mitigation. Moreover, our findings would be background information in future for making the strategy for radon mitigation nationwide, as well as for developing Korean-version of mitigation techniques according to types of dwellings in Korea.

• Journal of architectural history
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• v.5 no.1 s.9
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• pp.50-72
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• 1996

The typical Japanese house has the characteristics of open dwellings to make them cool in the hot and humid summer. And then the traditional town house 'Machiya', being built very closely to each other and walled up both sides, it has taken the open-oriented characteristics in itself. The purpose of this study is to clarify that the open-oriented of traditional 'Machiya' has been succeeded to the new 'Machiya' in the latest. The new 'Machiya' shows the open-oriented, taking the ventilative 'Huki-nuke' space of traditional 'Machiya' as the new spatial formal elements, in the changes such as scale material space organization. The characteristics of 'Huki-nuke' space are represented as follows ; 1. The facade of the traditional 'Machiya', which has taken on a semitransparent qualty, has been generally changed to the closing qualty except for the open parts of shop and garage. This facade of the new 'Machiya' has been taken to be in keeping with the existing town as much as possible. 2. A series of three rooms, composed of shop/living dining kitchen/room from the road, have been dispersed to every floors in a building with a very extensive scale. But this serial and linear type remains as the loosefit space, and the long dwellings of the upper stories are divided by type each dwelling unit. 3. 'Tori-niwa', which is a consecutive and penetrating space, connects the road with the rooms of dwelling and functions as the circulation of man thing energy, The new 'Machiya' changed to the multi-story, the corridor and the stair have been fumed up as the elements in the place of 'Tori-niwa' The 'Huki-nuke' space was locted in the hall, stairwell, living dining kitchen room, and so on. 4. The small court yard 'Tsubo-niwa' and back yard 'Ura-niwa' at the both ends of living spaces would be made a hole in a series of rooms and enclosed by the neighboring 'Machiya'. On the contrary the new 'Machiya' at present takes in the private and closing organization enclosing the innercourt. 5. The open-oriented ${\ulcorner}$In${\lrcorner}$ or ${\ulcorner}$Out${\lrcorner}$ is not brought out because of the delicate spatial formal configuration in the traditional 'Machiya'. But the open-oriented ${\ulcorner}$In${\lrcorner}$, all sides being closed by walls, is well brought out in the new 'Machiya'.

• Journal of the Korea Concrete Institute
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• v.28 no.4
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• pp.435-444
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• 2016

In Korea, approximately 48% of all households live in apartments, which are a form of multi-unit dwellings, and this figure increases up to 58%, when row houses and multiplex houses are included. As such, majority of the population reside in multi-unit dwellings where they are exposed to the problem of floor impact noise that can cause disputes and conflicts. Accordingly, this study was conducted to manufacture a high-weight, high-stiffness foamed concrete in order to develop a technology to reduce the floor impact noise. For the purpose of deriving the optimum mixing ratio for the foamed concrete that best reduces the floor impact noise, the amounts of the foaming agent, lightweight aggregate and binder were varied accordingly. Also, the target characteristics of the concrete to be developed included density of over $0.7t/m^3$, compressive strength of over $2.0N/mm^2$ and thermal conductivity of under 0.19 W/mK. The results of the experiment showed that the fluidity was very excellent at over 190 mm, regardless of the type and input amount of foaming agent and lightweight aggregate. The density and compressive strength measurements showed that the target density and compressive strength were satisfied in the specimen with 50% foam mixing ratio for foamed concrete and in all of the mixtures for the lightweight aggregate foamed concrete. In addition, the thermal conductivity measurements showed that the target thermal conductivity was satisfied in all of the foamed concrete specimens, except for VS50, in the 25% replacement ratio case for Type A aggregate, and all of the mixtures for Type B aggregate.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.12
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• pp.822-827
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• 2019

There is a high demand for off-base dwellings around Camp Humphreys in Pyeongtaek in accordance with the USFK base relocation project, but their residential planning needs to reflect their requirements. On the other hand, no studies that examined their requirements directly have been found. This study examined the requirements of USFK stationed in Camp Humphreys to identify their requirements. In general, residential planning requires a determination of the demand-based location and size, identification of the facility elements required for the site plan, and analysis of detailed architectural planning elements required for the building plan. Among these, preference analysis of the off-base dwelling demand, location, and site planning elements were performed in this study, and the architectural planning elements were left as following studies. The analysis showed that the demand for off-base dwellings is high, rental houses are preferred, and the commuting time is the most important factor in the location. In addition, while enjoying urban convenience, the location of the foothills near nature is preferred, the importance of the orientation is low and living with Koreans is not a problem. In addition, the demands for exercise facilities in the complex are relatively high.

• Journal of Environmental Health Sciences
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• v.44 no.1
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• pp.98-105
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• 2018

Objectives: In Mongolian housing, they use coal as a fuel for indoor heating and cooking. The combustion of coal releases particulate matter, which can affect indoor air quality. The purpose of this study was to analyze the concentrations of indoor $PM_{2.5}$ in winter time dwellings in ger town. Methods: In this study, indoor $PM_{2.5}$ concentrations, temperature and humidity in houses were measured by a real-time PM monitor, while the time activity patterns of the residents were also observed. Results: The correlation between factors that may affect the indoor air quality was analyzed.The indoor $PM_{2.5}$ concentrations were $178.4{\pm}152.7{\mu}g/m^3$ (n=37). Five types of indoor $PM_{2.5}$ concentrations have been classified, which were associated with indoor activity. The stove type, fuel types and indoor activities such as cleaning, cooking and opening the stoves were not significantly associated with indoor $PM_{2.5}$ levels. Conclusions: Further study is needed to determine the effect of stove type through 24hours of indoor air quality monitoring.

• Journal of the Korean housing association
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• v.18 no.3
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• pp.125-136
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• 2007

To improve the environment of individual residential area, the uniform development of multiple dwellings through site should be avoided. As an alternative to a large scale development of the currently popular high-density and high-rise apartment buildings, which disintegrates and destroys existing communities, a new residential type that is applicable to the individual residential area should be developed. From the new residential type, even for short history of Korea of modem urban residence, a new concept of residence can be formed, changing from the concept of a temporary staying place to the concept of a stable residing place. Also, a gradual improvement that transcends time can be expected, and the present and past appearances can co-exist. This study was conducted to suggest a new residential type with unit blocks that can improve the physical structure of existing individual residential area without destroying the structure. That is, among the factors that comprise the individual residential area, this study will focus on the unit block with a medium role between a site and a mega-block, and will suggest a new concept of residential unit in order not to destroy its physical structure. The physical characteristics of the unit block will also be analyzed.

• Journal of the Korean housing association
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• v.27 no.1
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• pp.13-20
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• 2016

The paper takes the rural housings of the Chaoxian nationality of Ham-kyeongdo in the three provinces in Northeast China as research object, to discuss the spatial form andthe characteristic of the change in the housing. The research result shows that the dwellings' plane forms in the Tumen River, the coast of Yalu River and the Sino Russian border are mainly traditional "Jeong-ji central type (J)", while in Heilongjiang are mainly "Jeong-ji and corridor central type (J-C)". In the evolution of living space and behavior patterns, there appears sliding door and partition between Jeongjibang and kitchen in the former, and Badang space in the front of the Kang and the behavior pattern remains its original seat-type lifestyle mainly. While there forms Dikang space and living space in the process of different cultures blend and modernization in the later and appears some upright-type behavior patterns. There is distinct characteristic in regional changes in both.

• Journal of the Korean housing association
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• v.25 no.5
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• pp.103-112
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• 2014

This study explores the typology of the urban detached houses in the new housing quarters that were created in the process of Seoul's urbanization in the aftermath of the Korean War. It analyzes and compares the urban tissue and space allocation set when the new urban residential areas were organized according to different methods of production. Based on the comparative analysis of housing built in the same time of 1960s, this study aims to deduce why a specific urban detached housing type was selected as an influential housing prototype and how this spread in later generations. Case study sites selected for this study include: the new Urban Hanok towns of Yongdu-dong, filled with mass Urban Hanoks built by housing developers; the single-family detached housing district of Myunmok-dong, filled with individual dwellings built by private builders; and the housing complex of detached houses in Suyu-dong, developed by government-sponsorship during the early 1960s. Each case examines the following: first, the difference in housing typology allocation according to urban tissue; second, the difference in spatial composition and arrangement within plots. As a result, it was found that differences in typology occur depending on which of the social, cultural, economic and technical factors was preferentially considered in forming urban tissue and allocating buildings in each residential area.

• Journal of the Korean housing association
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• v.13 no.6
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• pp.1-10
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• 2002

As the elderly population increases, concerns for the elderly's welfare become greater both quantitatively and qualitatively. In order to give a chance for the elderly to live in familiar dwelling and regional context to which they are accustomed, and to participate in their society actively, it is of great importance that suitable living spaces must be provided for the elderly. The practical ways of providing people with good living environment and its easy maintenance for healthy and valuable lives were discussed in this paper. This research is designed to propose pertinent policies related to social issues concerning the elderly. 137 seniors over 60 living in Gwanaju city were sampled and surveyed. The scope of planning for the elderly's lifestyle and welfare is divided into two parts, one is planning of space for the realization of stable and spacious dwellings and another is urban environment planning capable of supporting healthy and affluent lifestyles. Also, the realization of stable housing, the construction of urban structure for a healthy life, and the provision of barrier-free living conditions are investigated. For increasing the degree of stabilization and improvement for the elderly's life, self-governing bodies should grasp the demands of living condition and spatial requirements by taking the lifestyles of the elderly into account in urban or regional levels. Then, a master plan including development, improvement, execution, and maintenance of proper housing facilities and urban environments should be made for the best results.