• Journal of the Korea Society of Computer and Information
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• v.13 no.7
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• pp.117-126
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• 2008

Recent advances in medical imaging technologies have enabled the high-resolution data acquisition. Therefore visualization of such large data set on standard graphics hardware became a popular research theme. Among many visualization techniques, we focused on bricking method which divided the entire volume into smaller bricks and rendered them in order. Since it switches bet\W8n bricks on main memory and bricks on GPU memory on the fly, to achieve better performance, the number of these memory swapping conditions has to be minimized. And, because the original bricking algorithm was designed for regular volume data such as CT and MR, when applying the algorithm to ultrasound volume data which is based on the toroidal coordinate space, it revealed some performance degradation. In some areas near bricks' boundaries, an orthogonal viewing ray intersects the single brick twice, and it consequently makes a single brick memory to be uploaded onto GPU twice in a single frame. To avoid this redundancy, we divided the volume into bricks allowing overlapping between the bricks. In this paper, we suggest the formula to determine an appropriate size of these shared area between the bricks. Using our formula, we could minimize the memory bandwidth. and, at the same time, we could achieve better rendering performance.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.13 no.4
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• pp.199-204
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• 2003

Microstructure and chemical analysis of sintered bricks containing recycled wastes were investigated by SEM and EDS. The recycled wastes for which substitute ceramic raw materials were EAF (electric arc furnace) dust, fly ash and stone ash. Yellowish and brownish regions on the surface and brownish and blackish regions in the inside of bricks were observed. Main component of yellowish region on the surface turned out to be Zn. No chemical difference between the black-core region and brownish matrix. Mullite crystallites of 1 fm size were distributed in the inside of bricks and enclosed by glass phases. It seems that alumine-silicate mixtures of kaolin and fly ash were transformed to mullite crystallites during the sintering. Relatively large pores ot several ten fm size were observed in the black-core region in the inside of bricks. The main components of the inside of brick were Al and Si. The minor components were C, Na, Mg, K, Ca, and Fe. Particularly, the precipitates of Fe-rich crystallites were observed in the amorphous matrix. These precipitates were formed due to the local reduction atmosphere in the inside of bricks. Zn-rich covers were found on the surface of bricks because Zn diffused from the inside of bricks to the surface under the reduction atmosphere.

• Journal of architectural history
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• v.4 no.2 s.8
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• pp.25-44
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• 1995

Bricks are the earliest man-made building materials. Small-size bar bricks were found in use in the Warring States Period(戰國時代) in China. During the Qin(秦) and the Han(漢) Dynasties, brick constructions were built on a larger scale, but most of them were tombs. In case of Korea, bricks were found in use in the Three Kingdoms Period, but also most of them were tombs. Starting from the Unified Silla Period(統一新羅時代), brick gradually became a universal practice to built Buddhist Pagodas with bar bricks. Brick pagodas emergence marked a stage where technological progress made it possible for man to built high-rise brick work, and their dvelopment further perfected masonry technique and enabled building technology to attain new heights. Though from the very start brick pagodas existed side by side with stone pagodas, at the enitial stage they were overshadowed by their wooden counterparts and stone counterparts, because masonry thechiques were then still rather primitive, while woodwork and stonework had already reached a fairly advaced stage. The pagodas in ancient Korea were closely related to the Chinese stupa, which consisted of three parts, namely, the base, the body and the spire. The fact was, soon after the stupas were introduced into Korea, the Korean stupas began to develop features of their own. Korean brick pagodas were made up of a single-storeyed square base, multi-storeyed square body with a small gate, and a steel post with several layers of lotus flower superimposed one on the other.

• Advances in concrete construction
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• v.4 no.4
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• pp.231-242
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• 2016

The major problem of a coal combustion-based power plant is that it creates large quantity of solid wastes. So, to achieve the gainful use of waste materials and to avoid other environmental problems, this study was undertaken. The quantity of coal ash by-products, particularly coal fly ash and coal bottom ash has been increasing from the coal power plants around the world. The other objective of this study was to explore the possibility of utilization of coal ash in the production of ash bricks. In 15 different mixes, Mix Designation M-1 to M-15, the varying percentages of lime and gypsum were used and sand was replaced with coal bottom ash. Further, it has been noticed that the water absorption and compressive strength of mix M-15 is 13.36% and 7.85 MPa which is better than the conventional bricks. The test results of this investigation show that the prism strength of coal ash masonry prisms was more than that of the conventional bricks.

• Nuclear Engineering and Technology
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• v.56 no.4
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• pp.1544-1551
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• 2024

A unique brick series based on Vietnamese clay was manufactured at 114.22 MPa pressure rate for γ-ray attenuation purposes, consisting of (x) metallic waste & (90%-x) red clay mineral & 10% (hardener mixed with epoxy resin), where (x) is equal to the values 0%, 20%, 40%, 50%, and 70%. The impacts of industrial metal waste ratio in the structure and radiation protective characteristics were evaluated experimentally. The increase in metallic waste doping concentrations from 0% to 70% was associated with an increase in the manufactured brick's density (ρ) from 2.103 to 2.256 g/cm³ while the fabricated samples' porosity (Φ) decreased from 11.7 to 1.0%, respectively. Together with a rise in fabricated brick's density and a decrease in their porosities, the manufactured bricks' γ-ray attenuation capacities improved. The measured linear attenuation coefficient (μ, cm^-1) was improved by 30.8%, 22.1%, 21.6%, and 19.7%, at E_γ equal to the values respectively 0.662, 1.173, 1.252, and 1.332 MeV, when the metallic waste concentration increased from 0% to 70%, respectively. The study demonstrates that manufactured bricks exhibit superior radiation shielding properties, with radiation protection efficiencies of 88.4%, 90.0%, 91.7%, 92.1%, and 92.4% for bricks with industrial metal waste contents of 0%, 20%, 40%, 50%, and 70%, respectively, at γ-ray energy (E_γ) of 1.332 MeV.

• Journal of architectural history
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• v.14 no.2 s.42
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• pp.89-101
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• 2005

The bricks in Myung Dong Cathedral Church are now deteriorated by the weather such as temperature, humidity, and winds. Thus it is necessary to replace the old bricks to the restored bricks for the load bearing capacity as well as to prevent the penetrations of rains from outside. However the mortar composition is not well defined at this moment and there are literary about the mortar completions. Thus it is necessary to verify the mortar compactions between old bricks and results to bring the restoring the mortar for the replace of new bricks. The particles of mortar was collected from Myung Dong Cathedral Church and particle size was analyzed by the mortar and pestle and mechanicle floater. The X-ray diffraction and XRF of each particles are analyzed. The quartz and feldspar such as albite, kaolinite are observed in large particles(>1mm). However, the clicite was observed at lower than $43{\mu}m$ particles. In XRF analysis, the $SiO_2\;and\;K_2O$ are observed at large particles$(1mm-208{\mu}m)\;and\;CaCO_3$ is observed at small particles$(208-43{\mu}m)\;and\;CaCO_3$ is observed at small particles($208-43{\mu}m$). This is well coincide with XRD results. The optimum volume ratio of lime mortar would be 1: 2 ($CaO: SiO_2$).

• Archives of design research
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• v.14 no.4
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• pp.87-98
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• 2001

In the Chosun Dynasty (1392-1910), the walls and chimneys of palaces, temples, and the houses of the upper-class show various characteristics of decorative design patterns. This study investigated ceramic bricks and roof tiles, which is one aspect of environmental design studies. This study aimed to provide a typology ot traditional Korean design of bricks and roof tiles used in walls and chimneys, and to show the design characteristics. This study collected 685 designs of bricks and roof tiles, and divided them into 18 categories and 5 types of design patterns based on object figures, architectural styles, materials, and decorative methods. In conclusion, there were differences and similarities among the design patterns. In general, the palaces mostly used red, gray, and black bricks that had more detailed designs presenting auspicious signs or exorcism. But, temples and the houses usually used (black) roof tiles horizontally configured with the edges overlapping to decorate as wall as to strengthen their structure.

• Journal of the Korean GEO-environmental Society
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• v.4 no.2
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• pp.47-56
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• 2003

The production of industrial wastes have increased due to the growth of population and industrial development. Among these wastes, especially amount of paper ash has been increased year after year. If it is possible to reuse industrial wastes, it will be beneficial not only economically but also environmentally. In this study, the possibility of the utilization of paper ash were investigated as a construction materials through a series of laboratory testing carried out to evaluate physical properties, compaction, consolidation, permeability and compressive strength characteristics. Concrete bricks with replacement ratio of paper ash at 2, 4, 6, 8, 10, 12, 14, 16, 18, 20%, and clayey bricks with replacement ratio of paper ash at 5, 10, 15, 20, 25, 30% were used in the test in order to evaluate its quality. As a result of tests, it were shown that the maximum replacement ratio of paper ash satisfying the quality standards of concrete bricks and clayey bricks were 11.5% and 12%, respectively.

• Advances in environmental research
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• v.6 no.4
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• pp.255-264
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• 2017

This work investigated the use of sugarcane bagasse ash (SCBA) generated by an energy cogeneration process in sugarcane mill as an alternative raw material in soil-cement brick. The SCBA obtained from a sugarcane mill located in southeastern Brazil was characterized with respect to its chemical composition, organic matter content, X-ray diffraction, plasticity, and pozzolonic activity. Soil-cement bricks were prepared by pressing and curing. Later, they were tested to determine technical properties (e.g., volumetric shrinkage, apparent density, water absorption, and compressive strength), present crystalline phases, and microstructural evolution. It was found that the SCBA contains appreciable amounts of silica ($SiO_2$) and organic matter. The results showed that the SCBA could be used in soil-cement bricks, in the range up to 30 wt.%, as a partial replacement for Portland cement. These results suggest that the SCBA could be valorized for manufacturing low-cost soil-cement bricks.

• Computers and Concrete
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• v.5 no.5
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• pp.449-459
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• 2008

This paper focuses on the application of two dimensional orthogonal polynomials in the regression analysis for the relationship of product parameters viz. compressive strength, bulk density and water absorption of fly ash cement bricks with other process parameters such as percentages of fly ash, sand and cement. The method has been validated by linear and non-linear two parameter regression models. The use of two dimensional orthogonal system makes the analysis computationally efficient, simple and straight forward. Corresponding co-efficient of determination and F-test are also reported to show the efficacy and reliability of the relationships. By applying the evolved relationships, the product parameters of fly ash cement bricks may be approximated for the use in construction sectors.