• Honam Mathematical Journal
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• v.37 no.3
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• pp.287-297
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• 2015

In this paper, we investigate $T_1$ Boolean subalgebras of the Boolean algebra consisting all regular closed sets in a space and their Wallman covers. In particular, we will give sufficient and necessary conditions of spaces X satisfying ${\beta}E_{cc}(X)=E_{cc}({\beta}X)$.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.1
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• pp.156-163
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• 2006

The objective of this paper is to evaluate the performance of an operating system for embedded devices to that of the commercially available Windows platform. Analysis includes benchmarking the operating systems using a 'typical' PC workload, as well as identifying low-level areas in which the updated OS is limiting or enhancing the system performance. The primary benchmarking suites selected for this paper are 'WinStone' and 'HBench', with the former providing an application-based suite of tests and the latter providing the most direct means for isolating operating system effects on the system. We have demonstrated in a case study for embedded microprocessors, and evaluated a Windows platform at a low-level test as well as an application level using a benchmarking suite.

• Journal for History of Mathematics
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• v.19 no.1
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• pp.43-54
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• 2006

The purpose of this paper, followed by 'Nature$\cdot$Human, and Golden Section I ', is to study aesthetic consciousness, mentality model and body proportion of human, and the golden section applied to architecture and hand axe of stone age. In particular, handaxes of one million years ago have shown that they had critical competency to the basis of art and mathematics in the future. Furthermore, without pen, paper and ruler, the existence of mentality model made fundamental conversion of mathematics possible. Different sizes of handaxes were made by maintaining the equal golden section. This was the first example in relation to the principle mentioned in 'Stoicheia' by Euclid which was published hundred thousands of years later.

• Journal of architectural history
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• v.23 no.1
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• pp.21-31
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• 2014

The paper analyzed the excavational data from Bupyeong-office in Ulsan county in Chosun Dynasty, examined the composition of the community estimated at station community, and studied the duration of the community by using the excavated relics. In addition, the paper compared the excavational data with documentary records, studied the location Bupyeong-office, and investigated the size of station community overall. Community compositions such as buildings, residential place, pits, stoves, hemp kilns, cremation tombs, and farming appliances were identified. When compared to excavated relics such as tiles, white porcelain jars, agrayish-blue-powdered celadons, and celadon porcelains from building, residance, and pits, the community existed during 14C~17C. The station location was on the west side to the quarters for Byongmajuldosa of the Left Gyeongsangdo at King's location according to the old maps and documentary records. It is widely expected that No, 201 foundation stone buildings at Pyungsan relic I was related to the station because there was a distinctions on the stone pillar waterway and high quality of location in the size(the front 9 sections ${\times}$ the side 1 section) and the community. According to the building's functions and duplication relations in the community, it is regarded that there were 33~40 ground buildings, 40~45 pitting buildings, storages or 15~30 other purpose buildings, and 5~7 public buildings around No, 210 building in Bupyeong-office town.

• International Journal of Highway Engineering
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• v.18 no.1
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• pp.91-97
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• 2016

PURPOSES : The objective of this paper is to develop a pavement performance model based on the Bayesian algorithm, and compare the measured and predicted performance data. METHODS : In this paper, several pavement types such as SMA (stone mastic asphalt), PSMA (polymer-modified stone mastic asphalt), PMA (polymer-modified asphalt), SBS (styrene-butadiene-styrene) modified asphalt, and DGA (dense-graded asphalt) are modeled in terms of the performance evaluation of pavement structures, using the Bayesian algorithm. RESULTS : From case studies related to the performance model development, the statistical parameters of the mean value and standard deviation can be obtained through the Bayesian algorithm, using the initial performance data of two different pavement cases. Furthermore, an accurate performance model can be developed, based on the comparison between the measured and predicted performance data. CONCLUSIONS : Based on the results of the case studies, it is concluded that the determined coefficients of the nonlinear performance models can be used to accurately predict the long-term performance behaviors of DGA and modified asphalt concrete pavements. In addition, the developed models were evaluated through comparison studies between the initial measurement and prediction data, as well as between the final measurement and prediction data. In the model development, the initial measured data were used.

• Korean Journal of Heritage: History & Science
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• v.46 no.3
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• pp.48-67
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• 2013

This study was focused on the recognition of historical values and the establishment of conservation schemes for a Silla stone monument in Bongpyeong-ri, Uljin by combining the humanistic investigation of inscription reinterpretation and the scientific conservational diagnosis of deterioration. According to the investigation of inscription, a total of 13 letters were reconsidered compared to the preceding researches. Thus, the meaning and interpretation of previous inscription was partially changed. This monument is composed of gneissose leucogranite and the most suitable site as provenance of the stone would be the Jukbyeon seashore (2.1km). The site shows similar color, size and composition of minerals, gneissose structure and magnetic susceptibility as the Bongpyeong stone monument. This monument developed a structural crack (crack index 0.4) and a microcrack (crack index 2.0) along the gneissose structure. The horizontal strength is weaker than the vertical strength. Therefore, the cracks should be reinforced and treated. However, consolidating is not urgently needed because the total weathering grade by ultrasonic velocity shows the stage of moderate weathering(3,403m/s, 0.32). Also, the major problems of chemical deterioration are blackening (85.2%) with soil, iron oxide,rubbing mark, and salt crystals (17.3%) from the sea. Therefore, the contaminants and the salt crystals should be removed using pressure spray and pulp paper, while the application of poultice should be examined through clinical tests.

• Journal of Industrial Convergence
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• v.20 no.7
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• pp.73-78
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• 2022

This paper is a study on locality in architecture in Jeju with the theme of locality of architecture. This paper, as the last research paper in this series of studies, is a paper that verifies whether there is anything other than the locality revealed in the categories of 'hermeneutic' and 'phenomenal'. To this end, in this paper, the regional characteristics of the buildings of five Jeju IT companies were analyzed. As a result, the elements reflected in the architecture in terms of the locality of Jeju were quite insufficient. This can be seen as a result of the fact that the corporate image is important in terms of the architecture of an IT company. Nevertheless, if we summarize the elements that reflect the characteristics of Jeju in IT architecture, it is the wind and oreum used as architectural concepts, and Jeju stone used as the exterior finish. In conclusion, it could be seen that the regional characteristics of wind, oreum, and Jeju stone were used in IT architecture, and it was also found that these characteristics were within the scope of interpretive locality and phenomenal locality. Soon, it was found that the locality of Jeju architecture was within the hermeneutic and phenomenal category.

• Journal of Korea Multimedia Society
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• v.13 no.11
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• pp.1728-1738
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• 2010

Pyeon-gyeong, similar to Chinese Bianqing, is a Korean traditional lithophone with multiple stone chimes. Due to the temperature- and humidity-insensitive characteristics of its material, pumice stone, the instrument provides highly stable pitch and therefore has played a key role in Korean traditional court music. By reason of having absolute pitch, it is an important part of the research on the standard pitch and scale system of korean traditional music, but as an instrument, the study on the sound characteristics and worth is not making satisfactory progress, to date. This research is an analysis paper for physical modeling synthesis of pyeongyeong. Through this study, we will determine the original characteristics of the timbre of pyeongyeong as a unique korean traditional percussion, and investigate these characteristics objectively, based on the music acoustics by scientific analysis. Furthermore, this study will be used as an important basic material for physical modeling synthesis of pyeongyeong, and also make a huge contribution to the cultural applicability by the vitalization of graft onto the various artistic creation field, through the comprehension of the timbre of pyeongyeong as an instrument.

• The Journal of the Korea Contents Association
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• v.11 no.3
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• pp.460-466
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• 2011

Kameun temple was constructed in A.D. 682 after 46 year after Chumsungdae was constructed. This paper discusses the scientific implication of Taegeuk stone rods of Kameun temple site through the geometric analysis of their engraved figures. So we can estimate that the west Taegeuk of Kameun temple site has 2 circles comparing the path of the moon with that of the sun leading to the asymmetry in its emblem(Taegeuk) and the east Taegeuk of Kameun temple site has 1 circle representing the path of the sun. The Taegeuks along with around 30 equilateral triangles representing the north latitude $35.8^{\circ}$ give the explicit information of period of the orbit of the moon and the sun. These mathematical methods can explain some relics structure of antiquity with a few historical expounds.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.21 no.2
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• pp.136-144
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• 2009

This paper focuses on the attempt to manual application for optimization structural scale of stone and Gabion at the closing gap of sea dike. The manual was developed through hydraulic model experiment that measured the critical velocity of sill-crest, bottom protection and dam-face at the final closure of Saemangeum sea dike, and through the comparison and verification of critical velocity for each scale calculated by existing empirical formula. Also, the critical velocity when rocks are used together with gabion is measured to add to the manual, which is an initial attempt that had not been executed before. The manual proposes the appropriate structural scale according to the measured critical velocity per day during the final closure period of Saemangeum sea dike, and its application was appraised highly after the completion of the final closing.