• Journal of the Korean housing association
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• v.19 no.5
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• pp.1-10
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• 2008

This study attempts to analyze the characteristics of the space composition of the apartments and the general principles of apartments unit plans in Gyeongnam. Literature review and content analysis method were used in his research. The data of 108 unit plans were collected from e-catalogue and model houses of housing construction firms. The results of this study were as follows; 1) The general principle of Gyeongnam apartment unit plans, the tendency of 4LDk+2BATH type, 4bay, central type living room were showed. 2) In the point LDK and couple's bed room, LDK area become large and open type and couple's bed room were showed bed room+dress+powder+bath type as Maser's zone. 3) The entrance has a intermediate space as a balcony or a former space and the privacy of LDK space was protected from the entrance. 4) In the case of support space, generally support kitchen and laundry space were offered and several balconies were utilized. In fact, he differences of apartment plan composition between central cities and Gyeongnam were no showed. Therefore, these tendencies on plan composition of apartment in Gyeongnam were followed the general principles of Korean unit plans.

• Journal of the Korean housing association
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• v.28 no.1
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• pp.95-107
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• 2017

The purpose of the study is to analyze the planning characteristics of outdoor space in apartment complexes in terms of child-care environment. We selected 8 apartment complexes in Cheongju, within three years from construction, of small and medium-sized apartments ($60-85m^2$) where a large number of families with young children are presumed to reside in. As a result of the study, it was found that whereas the factors that can be quantified such as the floor height differences, the angles of ramps, and the number of the rest facilities are excellent, the qualitative part which cannot be easily quantified such as the location and direction of the rest facility and play materials should be improved a lot. And the following improvements were suggested; separating the pedestrian passage from the vehicle road in the main entrance of the complex, utilizing the piloti for infant caring, making the entrance area of apartment safe for pedestrians from vehicles, reallocating resting spaces, redesigning resting spaces safer to infants, building or reallocating existing booths at the stops of kindergarten buses, redesigning the square safer from vehicles with shades, making it possible for guardians to watch infants in playing field from the resting space, allocating natural environments essential for child development.

• International Journal of Fluid Machinery and Systems
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• v.10 no.3
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• pp.218-226
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• 2017

Severe radial thrust under off-design operating conditions can be a harmful factor for centrifugal pumps. In the present work, effects of geometry of a double volute casing on the hydrodynamic performance of a centrifugal pump have been investigated focusing on off-design conditions. Three-dimensional steady Reynolds-averaged Navier-Stokes analysis was carried out by using shear stress transport turbulence model. Numerical results for the hydrodynamic performance of the centrifugal pump were validated compared with experimental data. The hydraulic efficiency and radial thrust coefficient were used as performance parameters to evaluate the hydrodynamic characteristics of the centrifugal pump. The cross-sectional area ratio of the volute casing, the expansion coefficient of the rib structure, the distance between the rib starting point and volute entrance, and radius and width of the volute entrance, and length of the rib structure, were selected as geometric parameters. Results of the parametric study show that the performance parameters are significantly affected by the geometric variables and operating conditions. Optimal configurations of the double volute casing based on the design of experiments technique show outstanding performance in terms of the efficiency and radial thrust coefficient.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.16 no.1 s.106
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• pp.19-26
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• 2006

The test blasts were carried out by detonating some single blastholes at two upper sites of the underground storage cavern for the crude oil. One was performed at the entrance site of the construction tunnel and the other at the middle area of the underground storage cavern. Based on the blast-induced nitration measured by the test blasts, we suggested the propagation equations of blasting vibration that were capable of estimating the peak particle velocity. In addition, in order to assess the stability of the adjacent ground storage tank, we did the frequency analysis and the response spectrum analysis with the particle velocity-time history and the particle acceleration-time history that were measured by the test blast carried out on the entrance site of the construction tunnel. In result, it was predicted that the displacement on the highest part of the tank shell was less than the allowable displacement.

• Journal of the Korean Institute of Landscape Architecture
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• v.27 no.5
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• pp.48-56
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• 2000

This study aims to find out the norms and principles reflected in the spatial organization of royal tombs in the Chosun Dynasty through the modern interpretation of traditional oriental philosophy theory. We examined the characteristics of royal tomb sites including Jeshil(Shrine), Hongjunmun, tomb mound, ponds, and attached buildings employing an analysis of the spatial formation and landscape. This study covered 36 tombs of kings and queens in the Chosun Dynasty. The entire layout of royal tombs, including annexed buildings, was informal in may cases. This was due to following the natural contour rather than adhering to certain philosophical principles. The royal tomb site is divided into three zones. Jeshil and pond constitute a space for living people, visitors. Secondly, the semi-scared space includes the space from Hongjunmun to the entrance to the Chungjaka. The last space is for the dead, from the back of Chungjakak to tomb mound. This is in line with the layout of palaces of the Chosun Dynasty which is characterized by "three gates and three zones": outer yard-court yard- back yard. The size of the space for holding memorial ceremonies, from Hongjunmun to the Chungjakak entrance, was set at 900m until the early Chosun Dynasty. Since that time the distance varied according to the land topography due to the influence of metaphysics. It can be summarized that the spatial organization of royal tombs in the Chosun Dynasty is based on the Confucianism value, the natural contour of the site, and inner spiritual value.ual value.

• Journal of the Korea Safety Management & Science
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• v.26 no.1
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• pp.15-24
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• 2024

The purpose of this study is to improve the stack effect of the staircase and the failure to take into account the opening of the outside door of the staircase, which are the disadvantages of the existing smoke control only vestibule. As a result of the study, the new vestibule and the staircase simultaneous smoke control are equipped with an exhaust flap damper with an effective opening area of about 0.25 m² in the upper part of the staircase, and a ventilator-type air supply fan of about 5 m³/s in the lower part, and take measures to prevent overpressure in the staircase. If you use the new simultaneous smoke control method of the vestibule and staircase, you can achieve the following effects. First, it is possible to open the external entrance door. Second, it can reduce the stack effect. Third, the staircase door closes automatically without fail. And a new method of preventing overpressure was proposed for the vestibule.

• Journal of the Korean Society of Earth Science Education
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• v.2 no.1
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• pp.55-61
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• 2009

This study was designed to explore problem solving process to earth science area by elementary science gifted children, which compared and analyzed the questionnaires and problem solving to earth science area by gifted Science education center, Seoul National University Of Education, The analyzed results showed difference by gender that in the science study level at the time of entrance to the gifted Science education center, male students was the highest in the middle school as 37.5%, and female students in the elementary 6th grade as 61.5%. And male students were investigated to do more precedent study than female students. Secondly, in the problem solving process of earth science related problems, males made most use of problem solving process area(30.3%), and females symbolizing (27.5%) area. Thirdly, comparison of reasoning technology in problem solving process by gender indicated that both sexes made the most use of analytical reasoning (male 62.0%, female 53.6%) to solve problems.

• KIEAE Journal
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• v.9 no.6
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• pp.27-36
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• 2009

Lately construction companies are differentiating the outdoor spaces of apartment complexes to satisfy the needs of residents by providing underground parking area and variety of outdoor community spaces. Building walking networks through residential unit area, the major passage area and the entrance area of the complexes is very important factor to increase the use of the outdoor environment in the complexes. The purpose of this study is to evaluate the characteristics and the elements for the planning of exterior pedestrian spaces carefully through the analysis of current large-scale apartment complexes. In this study, the utilization of space, the connectivity to other spaces and the application of Universal design were evaluated through site visits in 5 large-scale apartment complexes. As a result, the utilization of space is well applied in the most of complexes especially in residential unit area. The connectivity to other spaces has low application compared to the others. Universal design is also well applied except sub criteria for the blind in most of complexes. This study will be able to help in providing better exterior pedestrian environment for residents in apartment complexes.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.35 no.2
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• pp.73-82
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• 2019

The purpose of this study was to analyze the area of the southern gate in ancient temples. As the southern gate played a role of the front gate, the national or royal ceremonies had been held around the southern gates. The ancient southern gate of temples has had the place for the huge ceremonies such as a royal parade and an inspection of troops. Moreover, this place was recorded in the 'Samkooksagi(三國史記)' as Jeon-Ro(前路). The Southern gate and the Jeon-Ro had been planned together in the front area of the ancient temples, and the gate had been designed to look down the Jeon-Ro. These findings can be verified through the result of a recent excavation at a site of Hwangnyongsa temple in Gyeongju. This research confirmed that the huge ceremonies had been held at the Jeon-Ro including the area of southern gates. Furthermore, a Hwangnyongsa temple is regarded as a concrete case of verifying the composition of the area of Southern gate.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.8
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• pp.29-36
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• 2004

Supersonic inlet buzz can be defined as unstable subcritical operation associated with fluctuating internal pressures and a shock pattern oscillating about the inlet entrance. The flow pulsations could result in flameout in the combustor or even structural damage to the engine. An experimental study was conducted to investigate the phenomenon of supersonic inlet buzz on axisymmetric, external-compression inlet. An inlet model with a cowl lip diameter of 30mm was tested at a free stream Mach number of 2.0. Subcritical instability was investigated by considering the frequency of pressure pulsation and shock wave structure at the inlet entrance. The results obtained show that total pressure recovery ratios were varied from 0.42 to 0.78, and capture area ratio from 0.34 to 0.98. The frequency of the subcritical flow increased with decrease in capture area ratios. Frequency was measured at $224{\sim}240Hz$.