• Journal of the Korean Society of Safety
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• v.28 no.4
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• pp.48-52
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• 2013

This study was carried out, using toxicity test apparatus, to analyze toxic gases of heat insulation material and adhesives of composite panels used for the architectural surface material when a fire occurs. The findings of this study show that CO, $CO_2$, HCOH, $CH_2CHCN$ and $NO_x$ were detected from styrofoam, reinforced styrofoam, polyurethane foam and glass fiber, but in the case of the polyurethane foam, HCl and HCN were detected as well. All the architectural adhesives released CO, $CO_2$ and $NO_x$, but HCHO was only detected from the adhesives for styrofoam, wood, tile, windows and doors; $CH_2CHCN$ was only from those for wood and stone; $C_6H_5OH$ was only from those for wood. The toxicity index was also measured for architectural surface material and adhesives. Polyurethane foam showed the highest index, 11.7, and glass fiber was followed as 6.8. Reinforced styrofoam showed 5.7 and styrofoam revealed the least 4.9. In the case of architectural adhesives, the highest ranking was those for stone 7.4, windows and doors 6.1, wood 5.3, tile 3.8, and styrofoam 3.7 were followed, respectively.

• Journal of the Korean GEO-environmental Society
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• v.10 no.7
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• pp.81-91
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• 2009

Recently, twin-tunnel is often designed in the aspects of disaster prevention and economical reasons. However, the design cases and the studies are relatively insufficient. By the twin-tunnel excavation, deviate stresses of pillar between tunnels are increased and the increased stresses induce the instability of the twin-tunnel. In this study, numerical analyses about the twin-tunnel behaviour were conducted with varying ground strength, width of pillar and depth of earth cover and a series of regression analyses were carried out by using the results of numerical analyses for the twin-tunnel. Based on the numerical analyses, an estimation method of derived stresses is suggested through the regression analyses. Also, based on the results of regression analyses, an quantitative estimation method considering the reinforcement effects is also suggested. Then various parametric studies were conducted to be considered the reinforcement type and various design parameters. Finally, the efficiency of the suggested method based on the Hoek-Brown Failure Criterion is verified through the results of parametric studies.

• Journal of the Korean GEO-environmental Society
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• v.21 no.11
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• pp.5-10
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• 2020

Although pile driver overturning accidents at construction site are not frequent, most leads to serious disasters. The main cause of accidents is uneven settlement of the ground. To prevent this, related guidelines such as KOSHA-C-101-2014, KOSH-A-GUIDE-71-2012, Occupational Safety and Health Standards, and NCS stipulate the installation of steel plates over ground. However, since the required steel plate thickness considering the self-weight of pile drivers and the underlying ground condition is not quantitatively presented, it is randomly applied in the field. In this study, the required minimum steel plate thickness was analyzed based on a numerical analysis (Plaxis 2D). Settlements and soil failure were calculated according to the different type of soils (sand, clay), load distribution and steel plate thickness (10mm, 20mm, 30mm, 40mm). Under all conditions, 10mm steel plate causes soil collapse. From thickness 20mm, the ground uneven subsidence is within 2° of the allowable leader angle.

• Journal of the Korean Society of Costume
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• v.23
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• pp.211-223
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• 1994

It was aimed to study the costume of Koryo dynasty based upon the one hundred and ten pictures of the writtened Budist scripture. The costume to study were made about 400 years during the King Mok-jong(1006) to the first year of the king Kong-yang based upon the Avatamaka Sutra and the Sutra of the Lotus. 가) Men's wear : 1. Hair style and hair dress : 1) Man bored a hair and put on the hat such as a Kuan, Kun, and Mo. The young boys binds his hair up one, two, and three knots, and tied up with a hair ribbon. A kinds of hats were Tung-t'ien-kuan(Yuan-yu-kuan) and Chin-hien-kuan and as a court dress. The man wore pok-여 as an official uniform and wore a pok-du , kun-mo as an everyday dress and wore a helmet as a solidier's uniform. 2. Clothes : 1) They wore Yuan-yu-kuan and Chin-hien -kuan as a court dress, and wore belt, boots, pleated decorated ling skirt also. They wore round shape collor big sleeve jacket, small sleeve long coat, belt , boots as an official dress. 2) the soldiers wore helmet, scarf, yangdang-kap , hung-kap, bak-kap, we-yo-kap, kun-kap and jok-kap and carries arms. 3) The young boys bind his hair up one, two and three angle shape an tied up a hair ribbons. 나) Women's wear : 1. Hair Style and hair dress : high rank ladies made their hair top knot (one, two, or more knots) and tied with hair ribbons , and decorated with precious stone, pan shape head dress , wheel shape head dress. 2. Clothes ; 1) high rank ladie's wore kun -kyun attached jacket , and jacket sleeves decorated pleats and pleats decorated on skirt, apron, back apron, knot belt, scarf.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.5B
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• pp.459-466
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• 2011

In this study, the resources investigations of small hydropower generation were carried out for the five proposed sites in northern Gyeong-buk area. They consisted of the discharge measurements, rating-curve, flow duration curves, electricity generation, and economic analysis, respectively. The basic data were suggested to select the optimal small hydropower sites in northern Gyeong-buk area. The sites for Yecheon Gun and Munsu Myeon as a result are the best proposed ones using economic analysis. We considered, however, that the finacial benefit for small hydropower development may be small under 500 kW facility. The optimal proposed site over 500 kW facility was suggested as Yeongyang Gun in this study.

• Journal of Korean Society for Geospatial Information Science
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• v.12 no.3 s.30
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• pp.61-67
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• 2004

Satellite and aerial images are effectively used to monitor ecological and environmental situation. More and more officials in the Ministry of Environment thus need to utilize these image data for various administrative affairs. However, it is difficult not only to deliver to the officials these image data mostly of large capacity through network but also for them to actively use the delivered data without specialized knowledge in remote sensing and image processing. Therefore, we established a large rapacity image data service system employing image compressive transmission and web-based image processing techniques. This system allows the officials to rapidly access all the associated image data and conveniently utilize the data using various functions implemented for remote sensing, image processing, GIS operations. Consequently, this system have been actively utilized for the decision making processes of the officials and hence accomplished a great reduction in the resources required for the data analysis for various administrative affairs.

• Journal of Korean Society for Geospatial Information Science
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• v.15 no.2 s.40
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• pp.3-14
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• 2007

This study proposes an automatic method to generate 3D building models using a draft map, which is an intermediate product generated during the map generation process based on aerial photos. The proposed method is to generate a terrain model, roof models, and wall models sequentially from the limited 3D information extracted from an existing draft map. Based on the planar fitting error of the roof corner points, the roof model is generated as a single planar facet or a multiple planar structure. The first type is derived using a robust estimation method while the second type is constructed through segmentation and merging based on a triangular irregular network. Each edge of this roof model is then projected to the terrain model to create a wall facet. The experimental results from its application to real data indicates that the building models of various shapes in wide areas are successfully generated. The proposed method is evaluated to be an cost and time effective method since it utilizes the existing data.

• Journal of Korean Society for Geospatial Information Science
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• v.25 no.2
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• pp.21-29
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• 2017

For the efficient and stable operation of autonomous vehicles or advanced driver assistance systems being actively studied nowadays, it is important to determine the positions of the vehicle accurately and economically. A satellite based navigation system is mainly used for positioning, but it has a limitation in signal blockage areas. To overcome this limitation, sensor fusion methods including additional sensors such as an inertial navigation system have been mainly proposed but the high sensor cost has been a problem. In this work, we develop a vehicle position estimation algorithm using in-vehicle sensors and a low-cost imaging sensor without any expensive additional sensor. We determine the vehicle positions using the velocity and yaw-rate of a car from the in-vehicle sensors and the position and attitude of the camera based on the single photo resection process. For the evaluation, we built a prototype system, acquired test data using the system, and estimated the trajectory. The proposed algorithm shows the accuracy of about 40% higher than an in-vehicle sensor only method.

• The Journal of the Korea Contents Association
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• v.16 no.4
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• pp.634-643
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• 2016

Achieving a certain degree of objectivity is one of main assessment priniciples to meet and self-assessment has been under-used as a formal instrument for assessing students' achievement due to lack of objectivity. Now, this research attempted to look into how students perceived self-assessment and how they engaged in the assessment process. Self-assessments and in-depth interviews with students were collected as main data sources. The results of data analysis are as follows. First, a student' perceptions of self-assessment have been observed to change over a course of a semester. Furthermore, changes in perceptions might have led students to get ownership of their learning. Conclusively, this research proposes that the research of self-assessment be accommodated into the socio-cultural context to demonstrate its desirable influence on students' learning.

• The Journal of the Korea Contents Association
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• v.16 no.1
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• pp.415-423
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• 2016

Cultural impact assessment system is a program to improve the quality of people's life by minimizing the negative effects and maximizing the positive effects on the cultural environment when a central government or local governments implement policies or plans. It was introduced in 2013 by Framework Act on the Promotion of Cultural Industries. Now the Ministry of Culture, Sports and Tourism is promoting a pilot project for cultural impact assessment system to reduce trial and error and settle it as a successful system. This study examined previous studies, international case studies, and various cultural impact assessment systems in oder to successfully seated cultural impact assessment systems and proposed ways to improve evaluations regarding objects, index, process, scale of objects, and evaluation agency. For the system to run smoothly in the future, additional researches are needed on the scale of evaluation objects, setting up detailed evaluation index, the composition of evaluation committee and its operation, and the introduction of cultural impact evaluators.