• Journal of the Korean Society for Railway
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• v.11 no.1
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• pp.13-18
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• 2008

In this study, unsteady wind pressure analyses on platform screen door (PSD) have been conducted considering the flow intereference effects between the moving train and the configuration of subway station. The major role of PSD prevents passenger accidents, wind pressure, polluted dust and noise when the train is entering the station platform. Computational fluid dynamic method with moving gird algorithm has been adopted to accurately predict unsteady pressure levels exerted on the PSD. Closed and open type station configuration are considered. Also, wind pressure levels for passing and stopping drive motion of the entering train are presented and practically compared each other.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.25 no.4
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• pp.426-433
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• 2014

The high-altitude electromagnetic pulse(HEMP) generated by a high-altitude nuclear explosion. This paper presents the comparison of electric field penetration in Bell laboratories and IEC 61000-2-9 standard when HEMP source penetrates through Naval Warship conducted coupling path and radiated coupling path. Also we analyze the effects of two kinds of coupling and propose Protective measures. Simulation results confirm IEC 61000-2-9 standard is more strict than the Bell Laboratories standard except for a lower frequency band, so we proposed IEC 61000-2-9 standard as a Naval HEMP standard. Finally, we offer the protective measures such as the shielding coating, Honeycomb ventilation, TVS in order to meet the military criteria.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.2
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• pp.81-88
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• 2020

The damping hinge of a built-in refrigerator was examined in terms of its stress and fatigue life. Analysis of the initial design showed that stress concentration occurred at the concave surface of the hinge lever, which was broken during the door opening-and-closing endurance test of the prototype. The maximum von Mises stress at this location exceeded the yield strength. In addition, Goodman fatigue analysis of the initial design showed that the fatigue life at this location was consistent with the failure observed during the endurance test. Based on these results, an improved design for the damping hinge was derived. Analysis of this improved design showed that the stress concentration in the hinge lever of the initial design was eliminated. In this case, the maximum stress occurred at the position where the hinge lever was in contact with the door stopping pin, and the maximum von Mises stress was smaller than the yield strength. Goodman fatigue analysis of the improved design indicated that the fatigue life of the entire damping hinge was infinite. It was therefore concluded that the improved design does not suffer from fatigue damage during the endurance test.

• Journal of the Korean Society for Railway
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• v.14 no.3
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• pp.216-221
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• 2011

An important problem in reliability analysis for repairable systems is to model the maintenance effect. The most of researches have assumed two extreme cases; one is perfect maintenance and the other is minimal maintenance. However, many of maintenances performed by domestic subway operators are imperfect maintenances which have the effect between both of two extreme cases. This article deals with the problem determining the imperfect preventive maintenance intervals based on failure data in units of the PDS(passenger door system) in Metro EMU. This paper deals with a case study on determining imperfect maintenance interval by using the level of maintenance effect through reliability analysis of PDS.

• Journal of the Korean Home Economics Association
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• v.43 no.7 s.209
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• pp.23-35
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• 2005

This study examined the consumer complaining behavior after purchasing functional health foods and investigated the variables which influence public and private consumer complaining behavior. The subjects of this study were 206 consumers who were dissatisfied after purchasing functional health foods. The survey was conducted during September. 15-October 6, 2003. Percentiles, frequencies, means, $X^2$ and logistic regression were utilized for data analysis with SPSS program. Major findings were as follows: 1 The groups reporting public complaining behavior were over college graduate, high income workers, professional and clerical workers(demographic variables). Purchasing related variable were high purchasing price, strategy of sales person and. ad, purchasing channel through door to door sales, telemarketing, multi level sales, and home shopping, purchasing purpose of weight control and cosmetic. 2. The groups reporting private complaining behavior were high school graduate, low income workers, housewives and the unemployed(demographic variables). Purchasing related variable were low purchasing price, the case of consumer need, purchasing in the shop, purchasing purpose of health restoration.

• Fire Science and Engineering
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• v.24 no.2
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• pp.114-119
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• 2010

The fire at a Busan indoor shooting range on November 14, 2009 was reconstructed by using a computational fluid dynamics model for fire simulations, in order to investigate the cause of the heavy death toll in a short period of time. Spread of the flame and smoke, and temperature distribution obtained by fire simulation were compared with the results of fire investigation based on the CCTV recordings. The flame and smoke flew out violently through the door into the cafeteria from the shooting range, and the cafeteria was filled with smoke just within 3 seconds followed by the onset of fire. This is consistent with the CCTV recordings. It was confirmed, as a result, that people in the cafeteria did not have enough evacuation time. The computed temperature at the door knob reached about $1400^{\circ}C$, near its melting point.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.11 no.6
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• pp.82-87
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• 2012

The purpose of this study is to produce a side impact beam with high tensile steel using a roll forming process. The door side impact beam plays an important roll in a car because it protects passengers from external crash. The roll forming process is a continuous bending process wherein a long metal sheet is bended as it continuously passes several rolls. The characteristic of this study is that an impact beam is produced by a continuous process using a ultra high strength steel without a hardening heat treatment. A model was determined by analysing plasticity of a cross section shape considering high strength. Design parameters of the impact beam was determined by crash-analysing the model. Workpiece products were manufactured by designing dies for roll forming and setting them up in a following process line. Results of a bending test and a FEM analysis was considered and reviewed.

• Journal of architectural history
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• v.29 no.2
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• pp.39-52
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• 2020

Seonjeong-jeon, the semi-great hall in Changdeok Palace, was constructed in a highly formal and conservative style and accommodated official ceremonies. However, the contemporary modification of the building has distorted or eliminated features including the two side doors on the front, the floor coverings, and the throne base (Jwa-tap) that consisted the most significant part of the throne. Seonjeong-jeon originally had three doors that stood between each pair of columns on the front side, respectively. The courtiers accessed the building through the side doors, while the central door was exclusively designated for the king. However, the renovation in 1999 ignored the political context of the architectural form of the building and changed the side doors into windows, damaging the traditional structure inherited from the early Joseon Dynasty. Although the building currently has traditional wooden floor structure (Woomul-maru), it was originally covered with square brick tiles (Bang-jeon) before the Japanese occupation, following the customs of early Joseon Dynasty. The throne was placed to the north of the central door and consisted of the throne base and a decorative roof (Dang-ga). A canvas (Jang-ja), which featured the royal symbolic painting of Sun, Moon, and Five Peaks, was also installed between the two columns that connected the base and the roof. Nevertheless, only the columns and the blank canvas remain nowadays after the removal of the base.

• International Journal of Safety
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• v.10 no.2
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• pp.21-26
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• 2011

In 2001, an independent official board was constituted in Japan to investigate aircraft and railway accidents. In the past 10 years, many accidents and serious incidents have been investigated and these official reports were published by the board, on which the author had sat for 9 years as boarding member. In the interim, there were several train disasters which mocked our trust in railways and also many apparent trivial incidents. In recent years, serious incidents, which a door of running rail cars opens suddenly with some trouble, happen 2 or 3 times in a year. For the past 10 years, such incidents have happened 14 times and 13 cases of them were closed by the board mentioned above. In these 13 cases, no one fell off the rail car, so that the death toll was none luckily. In this paper, these 13 serious incidents are picked up among all the reports published by the board and outlined using some tables. Especially, fall accidents of passengers are discussed mainly from the view point of impact force and duration time. Then, the equation of HIC (Head Injury Criteria) and the risk curves in terms of the HIC are dealt with properly.

• Korean Institute of Interior Design Journal
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• v.15 no.1 s.54
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• pp.139-146
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• 2006

This study shows the floor plan types and the space composition of multi-used toilets in public-toilets of Choongchung-Do. The areas of multi-used toilets are various from 4.8m2 to 10.5m2 And there Is usually one multi-used toilet in one public-toilet, but some public-toilets have two multi-used toilets. Multi-used toilets have several equipments such as toilet stool, urinal, washstand, change diaper, chair for baby-care, toilet stool for child, urinal for child, so on. All the multi-used toilets have toilet stool and washstand, but urinal and change diaper were used restrictively, and chair for baby-care, toilet stool for child, urinal for child were used in few cases. There are six types how the multi-used toilets are located in public-toilets, five types of multi-used toilet forms, and five types how the equipments are installed in multi-used toilets. The dotted blocks are installed partially in line type, and partially in spot type. But some cases, there was no installation of dotted block. Auto-sliding door were usually applicated, and some other types of door system were used restrictively. This study offers not only the present conditions, but also the appropriate planning directions of the multi-used toilets.