• Journal of architectural history
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• v.23 no.4
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• pp.81-90
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• 2014

This paper aimed to identify the variation of layout in Hwangnyoungsa buddhist temple site based on studying published the excavation research paper and texts related to layout. According to earlier studies, in 1st construction period(553~569) of Hwangnyoungsa, there were trisection spaces with one main hall and two corridors in inner part and then in 2nd period(584~645), unified one. But actually trisection spaces had been maintained until the middle part of 8th century. And in each space there was the main hall with large yard. That is the 2nd period layout of Hwangnyoungsa. For the attainment this result, each building remains are judged under duplicated situation which one was the previous and next by consideration of the construction condition and special features of foundation. Although the meaning of trisection system of Hwangnyoungsa is similar with the layout of ancient palace, it could be said to derive from accumulation excavation research in Silla's archeological site and such studies.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.37 no.2
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• pp.409-417
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• 2017

The study is concerned with doing research on the plan to prevent the dispute occurring between contract parties regarding the additional cost generated when the construction period is shortened during construction work. After the review of the claim cases and the judgment cases of the court regarding the additional cost caused by the shortened construction period, the representative problem is the incomplete regulations on calculating the additional cost. In the 1st stage of the results of the research on the problem, the procedure handling the additional cost is presented, and the process of planning and approving the shortening of the construction period is gone through in the stage of the procedure to prevent the dispute on the additional cost between contract parties. In the 2nd stage, the plan on enacting and revising the regulations on removing the incomplete problems of the current regulations relating to the calculation of the additional cost. The basis for the advanced contract management is provided by resolving the incomplete problems of the current regulations relating to the shortening of the construction period with the prevention of a dispute and the resultant loss.

• Architectural research
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• v.7 no.2
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• pp.91-96
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• 2005

The purpose of this study is to clarify the reality of labor and capital productivity in the construction industry through an industry-level approach and to analyze the relationship between labor and capital productivity using a Cobb-Douglas production function. According to the research results, the construction industry has shown a very high capital productivity, while labor productivity has kept up a low level during the 1980s and 1990s. The reason was because of the lack of skillful construction workers and the decrease of capital. Meanwhile, the construction productivity has greatly increased since 2000 when there was no change in wages. This was because of a large inflow of low-wage foreign workers while the amount of value added has dramatically increased due to the liberalized sale price of apartment buildings. According to the analysis by the Cobb-Douglas production function, the elasticity coefficient of V/L to K/L in the construction industry had decreased from 1.1663 in the $1^{st}$ period(1971-1988) to 0.4465 in the $2^{nd}$ period(1989-1997), and to 0.1664 in the $3^{rd}$ period(1998-2003). Such a result means that the allocation of labor has gradually increased while the allocation of capital has decreased. Moreover there was a big increase in allocation of labor after 1998 due to the excessive deterioration of capital. In conclusion, in order to raise the construction productivity and to avoid labor-intensive production methods, investment for capital should be more increased. In particular, new machinery and equipment that can actually substitute human labor in construction sites should be more developed and applied to construction sites.

• International conference on construction engineering and project management
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• 2005.10a
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• pp.968-973
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• 2005

The purpose of this study is to clarify the reality of labor and capital productivity in the construction industry through an industry-level approach and to analyze the relationship between labor and capital productivity using a Cobb-Douglas production function. According to the research results, the construction industry has shown a very high capital productivity, while labor productivity has kept up a low level during the 1980s and 1990s. The reason was because of the lack of skillful construction workers and the decrease of capital. Meanwhile, the construction productivity has greatly increased since 2000 when there was no change in wages. This was because of a large inflow of low-wage foreign workers while the amount of value added has dramatically increased due to the liberalized sale price of apartment buildings. According to the analysis by the Cobb-Douglas production function, the elasticity coefficient of V/L to K/L in the construction industry had decreased from 1.1663 in the 1^st period(1971-1988) to 0.4465 in the 2^nd period(1989-1997), and to 0.1664 in the 3^rd period(1998-2003). Such a result means that the allocation of labor has gradually increased while the allocation of capital has decreased. Moreover there was a big increase in allocation of labor after 1998 due to the excessive deterioration of capital. In conclusion, in order to raise the construction productivity and to avoid labor-intensive production methods, investment for capital should be more increased. In particular, new machinery and equipment that can actually substitute human labor in construction sites should be more developed and applied to construction sites.

• Korean Journal of Child Studies
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• v.27 no.5
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• pp.123-141
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• 2006

The phonemic awareness program included construction of 45 activities emphasizing various sounds in speech and letter names using a storybook. The subjects were thirty 1st and 2nd grade low-income(15 experimental and 15 control group) children attending an after-school program in Seoul. Pre- and post-tests assessed children's reading, self-concept, and learning motivation. The experimental group children had rich opportunity to deal with and discuss sounds, syllables, phonemes, and the Korean alphabet names during storybook reading, games, and play over a 12 week period, while the control group children were provided with worksheets, subject tutoring, and homework guidance. Results showed that the phonemic activities were an effective and useful way to enhance children's reading ability, self-concept, and learning motivation.

• Journal of architectural history
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• v.13 no.1 s.37
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• pp.53-69
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• 2004

Located in a rear garden of Changdeok Palace, Yeonkyeong-Dang is valued as the most characteristic building of the houses of aristocrats of the later Joseon Dynasty. The time of the construction has been much debated, however, it is perceived through this research that the construction was completed in September 1827(the 27nd year of king Sunjo's reign). The shape of the buildings during this period resembles a letter ㄷ as shown in the picture of Dong-Kweol. We previously described that the purpose of Yeonkyeong-Dang was to carry the portrait of king Yikjong while keeping the shape of building when it was first established until the 8th year of king Heonjong (1842). In 1865 (the 2nd year of king Gojong's reign), it was reconstructed with very different outlook which has remained the present shape. The characteristic features of the residences of aristocrats were reflected in newly reconstructed Yeonkyeong-Dang. The structure was largely divided into two quarters that occupied by male and female residents respectively. The two quarters were bordered by fences and added with a study and a pavilion. The reconstruction was conducted by king Gojong's father, Daewon- Goon and its purpose was to prepare a separate house for the king and queen before the kings wedding that was about to come. During the 19th century, building an imitation of houses of aristocrats became quite a trend in the palace. Built in 1847, Nakseon-Jae was precedented and followed by Yeonkyeong-Dang. Also later Geoncheong Palace was built in Kyeongbok Palace in 1873. All of the three buildings imitated houses of aristocrats. Divided residences of male and female sections and splendid decorations were common features. Nakseon-Jae was the smallest in the structure of spaces, ornamentation of details and its sizes, Yeonkyeong-Dang was the second and Geoncheong Palace was the most distinguished building. The constructions of these three buildings created an innovative architectural wave in the 19th century palace. Yeonkyeong-Dang was the building that mediated the new flow of architectural structure in the 19th century palace.

• Journal of the Korean Society of Safety
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• v.20 no.4 s.72
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• pp.138-147
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• 2005

The accidents which occurred between during february of 1997 to December of 2004 at the 2nd Daegu subway construction site have been classified. The accident types of injuries include accidental falls, falling objects which consist 53.4% of all accidents. This result is higher than the same types of accidents occurring at construction sites which are 46.3%. It was found that the 3.4 times more accidents are caused from safety measures and working methods than problems caused by lack of supervision. 78.0% of the accidents occurred at stations and at the ventilation area. 31.9% of the accidents occurred when the operation was near completion($81.0%{\sim}100.0%$) which means there was pressure to complete the operation to meet the set due date. In the case of 50.0% of the accidents were caused by workers with less than two month work experience. And lumbago is 6.9%, especially lumbago didn't showed before. Maybe accident should increase if not reduce a possibility of danger. In this study a literature search has been conducted for the cause of these accident types and respective suggestions are provided.

• Journal of the Korean Society of Safety
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• v.14 no.1
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• pp.116-123
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• 1999

It is generally considered that only questionnares, collected at the time when each course close, have been evaluated & represented for all of the subjects. But all the result of each course can be actually evaluated using only the data taken from how to apply for at the construction site or at the factory, directly, for the period of at least one year, not just short months. This study is to evaluate and quantify the result and analyses using the data from questionnare concerning the level practically applied to each process at construction site. 1st for three(3) months, 2nd for six(6) months, 3rd for nine(9) months, finally 4th for twelve (12) months, one year These questionnares have been distributed for same people four(4) times to find out what to, how to be applied with each subject.

• Korean Journal of Agricultural Science
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• v.39 no.4
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• pp.459-466
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• 2012

The objective of this study is to observe growth pattern of grand rapids(lettuce) according to different dexperimental conditions for minimizing its growth period such as composition of nutrient, irradiation time of light source and cultivation mode. The culture of water spray type using seeds of grand rapids was performed during growth period of total 50 days. Experimental conditions consist of five compositions of nutrient (PW 0.5 mS/cm, PW 1.0 mS/cm, PY 0.5 mS/cm, PY 1.0 mS/cm, PW 2.0 mS/cm) and three irradiation times of light source (12h(on) / 12h(off), 18h(on) / 06h(off), 24h(on) / 00h(off)). Illumination was adjusted to ratio of 7:1:1 of red, blue and white color, respectively. Indoor environmental condition for cultivating grand rapids is as follows: temperature (19-$22^{\circ}C$), relative humidity (60-70%) and carbon dioxide (1,000-1,200 ppm). The data were obtained from five iteration tests. The maximum growth level was observed in the experimental condition of 18 hr(on) / 06 hr(off) and PY 1 mS/cm for 1st week of cultivation period, 24 hr(on) / 00 hr(off) and PY 1mS/cm for 2nd week of cultivation period, and 24 hr(on) / 00hr(off) and PW 1 mS/cm for 3rd week of cultivation period, respectively. On the contrary, the minimum growth level was observed in the experimental condition of 18 hr(on) / 06 hr(off) and PW 0.5 mS/cm for 1st week of cultivation period, 12 hr(on) / 12 hr(off) and PW 0.5 mS/cm for 2nd week of cultivation period, and 12 hr(on) / 12 hr(off) and PY 0.5 mS/cm for 3rd week of cultivation period, respectively. Based on the results obtained from this study, it is concluded that the growth level of grand rapids varied with different irradiation time of light source and composition ratio of nutrient according to cultivation period.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2008.05a
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• pp.57-60
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• 2008

This study investigated the results of insulation heat curing method using double layer bubble sheet in slab concrete and mass concrete in cold weather environment. First of all, when double bubble sheets are applied, it was shown that slab concrete was protected from early freezing by remaining between 6 and 15℃ even in case outside temperature drops -9℃ below zero until the 2nd day from piling, and in the case of mass concrete, with the maximum temperature difference between the center and surface less than 4℃, crack occurrence index was close to 2 and no hydration heat crack occurred by internal constraint. The insulation heat preservation curing method using the double bubble sheet applied in this field prevented early freezing owing to stable curing temperature management, deterring concrete strength development delay at low temperature, and obtained the needed strength. Also, it was proven that the method is highly effective and economic for cold weather concrete quality maintenance through curing cost reduction like construction period shortening and labor cost reduction, etc by reducing the process of temporary equipment installation and disassembling.