• Korean Journal of Construction Engineering and Management
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• v.8 no.6
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• pp.178-187
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• 2007

As the government has enforced recently the policies on the distribution of the housing, the construction cost of multi-family housing projects has increasingly become very sensitive and political issue. However, it is difficult to predict the construction cost in planning and design phase of the project because the Bill of Quantity of the multi-family housing projects was composed of breakdown structure based on each work package. To predict the construction cost in planning and design phase for multi-family housing projects in more effective and reasonable way, this study developed the cost breakdown structure based on spaces using Delphi method. The Cost Breakdown Structure (CBS) based on spaces for multi-family housing projects basically consists of three parts: (i) Building part; (ii) Non-building part; and (iii) Additional part. The characteristics of spaces in multi-family housing projects are fully taken into consideration. Then these three parts were subdivided into work packages in terms of work tasks. Additionally, the usefulness and effectiveness of Space CBS in this paper were validated by analyzing the BOQs of several collected sample projects and matching with Space CBS afterwards.

• Journal of the Earthquake Engineering Society of Korea
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• v.23 no.6
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• pp.311-319
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• 2019

The number of aged bridges is increasing so that bridges over 30 years old account for about 11% of all bridges. Consequently, the development of a seismic performance evaluation method that considers the effects of ageing is essential for a seismic retrofitting process for improvement of the seismic safety of existing old bridges. Assessment of the damage situation of bridges after the recent earthquakes in Korea has been limited to the bearings, anchor, and concrete mortar on piers. The purpose of this study is to evaluate the seismic responses of PSC box girder bridges by considering the ageing effect of rubber bearings (RBs) and lead-rubber bearings (LRBs). The modification factor proposed by AASHTO is used to take into account the ageing effect in the bearings. PSC box girder bridges with RBs and LRBs were 3D modeled and analyzed with the OpenSEES program. In order to evaluate the ageing effect of RBs and LRBs, 40 near fault and 40 far field records were used as the input earthquakes. When considering the effect of ageing, the displacement responses and shear forces of bridge bearings (RBs and LRBs) were found to increase mostly under the analytical conditions. It was shown that the effect of ageing is greater in the case of RBs than in the case of LRBs.

• Journal of The Korea Institute of Healthcare Architecture
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• v.27 no.1
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• pp.45-51
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• 2021

Purpose: Problems related to the elderly's daily life, such as social isolation and absence of a place to go, are already widely recognized, but there are few domestic studies or support policies for this, and the elderly leisure welfare facilities provided by the state do not fully support the elderly's daily life. There are studies related to the elderly's neighborhood environment and facilities, which can be seen as the third place for the elderly in Korea, but these are mostly quantitative studies. In order to talk about the third place for daily support for the elderly in Korea, a detailed study of the use cases of the third place in Korea is needed. This study analyzes the third place of the elderly in Korea and discovers the characteristics and components. Based on the detailed analysis of the third place of the elderly, the characteristics of the third place of the elderly in Korea and the elements constituting it are found to be able to represent the specific necessary environment of the third place of the elderly. Methods: The research targets include 'A Mill' (located in Jungnang-gu, Seoul), and 'Roadside in front of Villa B'(located in Dongdaemun-gu, Seoul), 'C-dong roadside park'(located in Dobong-gu, Seoul) within the range of repeated observations and meetings among the places used as a third place for the elderly was selected. The site survey consisted of in-depth interviews, observational surveys, and participatory observations. In-depth interviews were held for a total of 5 months, from October to December 2019 and from April to May 2020. Results: As a result, a total of 11 characteristics (adjacent to the residence, an open place, an independent space, a comfortable place to stay, a pleasant space, safety is guaranteed, a place that has been operated for a long time, a place that can be used autonomously, a place where social exchange occurs, No financial burden, fun activities) was discovered. Implications: This study is significant in that unlike the existing studies focusing on the use behavior of established institutions or facilities, the elderly identified the necessary environment through their own created places.

• Journal of architectural history
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• v.26 no.6
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• pp.67-76
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• 2017

Royal banquets under the reign of King Sunjo saw developments in the playacting stage, which exhibited characteristics unique to the transitionary period between Jeongjo and Gojong this period established the framework of the Joseon Dynasty's playacting stage construction. Starting with the Jagyeongjeon-Hall banquet and continuing into the Year of the Golden Rat banquet, the next-day banquet by the Crown Prince demonstrates a renewed format, with the stage also changing accordingly. This change was substantiated by more assertive use of the Red Blind and gabjang. Previously, the Red Blind has been installed in the palace hall and around the royal courtyard, to form three sides, but as next-day banquets became more frequent under Sunjo, the Red Blind developed and came to be installed in accordance with the hierarchy within the royal family. In the Year of the Golden Rat banquet, the Red Blind was lifted and the throne of the crown prince was situated in the palace hall. In the banquet of the following year, however, the Red Blind was let down and the crown prince's throne was placed outside, in palace court yard. This seems to have been a gesture to reorient the crown prince's political standing and restore Sunjo's sovereignty the following year. Hence, the installation of the Red Blind developed in accordance with the royal hierarchy and ranks under Sunjo's reign. The gabjang provided the second layer of protection for the playacting stage. The hongjeongju gabjang surrounded the stage in multiple layers and served as a partition. The gabjang from the Year of the Golden Bull banquet, in particular, boasted a unique installation, where it dangled from both sides of the royal palace's facade. Hongjeongju gabjang, lapis lazuli gabjang, red gabjang, and yellow curtains were installed in the stated order to reflect Sunjo's 40th birthday as well as the 30-year anniversary of his coronation. The Red Blind and gabjang from Sunjo's years were positioned in creative ways to reinstate the royal authority, and demonstrated many improvements from those of Jeongjo's reign.

• Journal of architectural history
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• v.27 no.2
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• pp.89-100
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• 2018

The stylobate for expanding the external stage area was the most frequently installed installment out of the installments installed for royal court ceremonies. The stylobate was installed for various ceremonies such as funeral rites, ancestral rites, customary formalities, state examination, feasts for celebrating a honored guest of the court, queen's silkworm cultivating ceremony, heir appointment, the presentation of honorary titles for the king or queen in honor of their merits, and entertainment of foreign dignitaries. The exact period stylobates came to be used for the play stage. The stylobate consists of the 紅座板, 屯太木, 竹欄間, 足木, and the 層橋. Depending on the 足木, the substructure of the stylobate, the stylobate could be divided into the 長足木, 中足木, 短足木, 平足木 type. The detail structure of the stylobate changed in form from the jokmok and duntaemok that appeared until the time of King Seonjo, into the 長屯太木, 短屯太木, and the 短短屯太木 during the time of King Heonjong. With the introduction of the 中足木, materials began to become more segmented and the structure stronger. According to existing records, while the height of the stylobate was not significantly high prior to King Seonjo's reign, the 十四層雲橋 and the 十三層層橋 introduced during the time of Emperor Gojong was designed to reflect his rank in external ceremonies while the eight story step bridge was exhibited in internal ceremonies to reflect the rank of Queen Mother Sinjeong. From here, we can deduce that the fourteen and thirteen story cloud bridges representing the king was of a higher grade than the eight story step bridge which represented the queen mother. Finishing by adding boards to the lower part of the stylobates began to appear in the time of King Seonjo. During King Heonjong's reign, the lower finish became gentrified with a thin board called 修粧板, and yeomupan 廉隅板 for decorating the edges of the stylobates were installed. Such style of finishing the lower part of the stylobate with boards mostly appeared in elaborate feasts 進饌 and celebrations 進宴 within the royal court 內宴. The stylobates appeared to have served not only practical purposes such as expanding the stage area, but also as installments which realize the authority and prestige of the royal crown. They were installed according to the purpose of the ceremony and the rank of the participant. In short, stylobates became established during King Seonjo's reign, became segmented and gentrified during King Heonjong's reign, and began to take height variations during Emperor Gojong's reign to reflect the rank and authority of the king and queen mother. As such, it can be considered another characteristic of Joseon Dynasty architecture.