• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.28 no.6
• /
• pp.256-262
• /
• 2018

A great amount of fly ash, which is a waste from a thermal power plant, has not been appropriately recycled until now. Landfill of flay ash causes environmental pollution and enormous economic costs. In this study, manufacturing of architectural ceramic tile was investigated replacing fly ash with clay raw material. The properties of porcelain tile was analyzed after manufacturing porcelain tile with mineral based glaze and fast firing process. In particular, the effect of the fly ash addition on the properties of ceramic tile was investigated by increasing the amount of limestone addition. Porcelain tile with fly ash showed excellent bending strength, water absorption, warping and abrasion resistance. However, a significant decrease in durability was observed through the autoclave test. Addition of limestone increased the water absorption, twisting and hydration expansion of the ceramic tile, but it was confirmed that the durability of the ceramic tile with fly ash was greatly improved. In conclusion, recycled architectural ceramic tiles, which can meet domestic construction standards, could be manufactured with the addition of fly ash and limestone.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2005.07b
• /
• pp.867-872
• /
• 2005

High-pixel-density displays are now under development to meet the needs of next-generation mobile devices; methods to more efficiently build such displays are described. Displays based on subpixel rendering and RGBW technologies, known as PenTile $Matrix^{TM}$ RGBW, are shown to offer the best approach to meeting the demanding requirements of low manufacturing cost, high brightness, and low power.

• Proceedings of the KSR Conference
• /
• 1999.11a
• /
• pp.352-359
• /
• 1999

Polymer stem insulator for an electric railway has been developed in 1995 in Korea. Owing to its excellent electrical and physical characteristics, KT mark was awarded for the developed polymer stem insulator. After new specification of KNR(Korea National Railway) was established, tile evaluation of long-term reliability combined with the improvement of manufacturing process was carried out. In 1998, this polymer stem insulator was installed in commercial electrical railway line. This paper presents the long-term reliability properties of the installed polymer stem insulator compared with conventional insulator. The location of tile installed polymer stem insulator in KNR is also introduced.

• Korean Journal of Materials Research
• /
• v.27 no.2
• /
• pp.76-81
• /
• 2017

Recently, there have been many efforts to establish suitable processes for recycling fly ash, which is produced in thermal power plants and which poses serious environmental problems. Use of fly ash as a major ingredient of ceramic tiles can increase fly ash utilization, as well as reduce the cost of raw materials in ceramic tile production. In this study, the effects of fly ash addition on ceramic tile properties such as bending strength, water absorption and porosity were investigated. A manufacturing process of ceramic tile was developed for utilization of fly ash with high carbon content. In this approach, it is important to hold the ceramic tiles at a temperature that is sufficient for carbon oxidation, before the pores supplying oxygen to the inside of the ceramic tile are sealed. Ceramic wall tiles were manufactured with 0-40wt% of fly ash addition. The water absorption and porosity of the fired body were slightly changed with increasing fly ash content up to 30wt% and decreased with greater amounts of fly ash addition. The bending strength of ceramic tile including 10wt% fly ash increased, reaching a level comparable to that of ceramic tile without fly ash.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2000.10a
• /
• pp.51-56
• /
• 2000

This study is to implement automatic inspection system of motor body panel by visual system. since it is inefficient to examine adhesion condition of components with the naked eye, image processing algorithm is presented to replace the existing manual inspection process with an automatic inspection process the developed automatic inspection system presents tile examination method of the adhesion condition of components with a pixed camera, which leads to an increase of the productivity and a reduction of manufacturing cost

• Journal of architectural history
• /
• v.8 no.4 s.21
• /
• pp.25-38
• /
• 1999

After Japanese Invasion of Korea in 1592 was over and the situation was coped with, Chang-Kyoung Palace and Chang-Duk Palace were rebult, and In-Kyung Palace and Kyung-Duk Palace were built during the reign of Kwang Hae Kun. Many utilitarians were engaged with the construction as a manager, and they devoted themselves to improve technology. As a result, craftsmen were treated so valuable, compared to the past, that they were consulted about the technical problems under construction, the process of making an estimate, and the management of construction materials. Moreover, famous craftsmen obtained the government service. And there were various attempts on organizing and compensating workmen in order to manage them efficiently. In addition, the know-how of manufacturing a blue tile, which had been failed to succeed due to the war, was revived, and manufacturing a yellow tile, which had not been used, was studied by utilitarians. Finally, There were many kind of technical attempts and development under the construction of palaces, which gave utilitarians a chance to express their ideas, expected practical science, and assembled craftsmen who had scattered due to the war, during the reign of Kwang Hae Kun

• Korean Journal of Materials Research
• /
• v.27 no.11
• /
• pp.583-589
• /
• 2017

Ceramic ink-jet printing has become a widespread technology in ceramic tile and ceramicware industries, due to its capability of manufacturing products on demand with various designs. Generally, thermally stable ceramic inks of digital primary colors(cyan, magenta, yellow, black) are required for ink-jet printing of full color image on ceramic tile. Here, we synthesized an aqueous glass-ceramic ink, which is free of Volatile organic compound(VOC) evolution, and investigated its inkjet printability. $CoAl_2O_4$ inorganic pigment and glass frit were dispersed in aqueous solution, and rheological behavior was optimized. The formulated glass-ceramic ink was suitably jetted as single sphere-shaped droplets without satellite drops. After ink-jet printing and firing processes, the printed glass-ceramic ink pattern on glazed ceramic tile was stably maintained without ink spreading phenomena and showed an improved scratch resistance.

• Proceedings of the KWS Conference
• /
• 1996.05a
• /
• pp.13-14
• /
• 1996

High Frequency Electric Resistance Welding process has been widely used in manufacturing welded steel pipes because of its high welding speed and quality. This process utilizes the skin effect as well as the proximity effect of the high frequency current in heating the skelp edge. In this study, an analytical solution of the edge temperature was obtained based on several assumptions. The assumptions includes the expontial decay of weldingcurrent from the surface and neglect of the heat loss in the welding direction. This calculation shows a good agreement with the observations made from the high speed camera. Using tile analytical model, tile heat required as a function of the welding speed and the skelp thickness was determined. These results were compared with the experimental results obtained.

• Proceedings of the KSR Conference
• /
• 2001.05a
• /
• pp.401-407
• /
• 2001

Out of 412km long Kyung-bu high-speed railway, 302km was designed in tile form of either bridges or tunnels. Most of bridges were designed to be prestressed concrete box girder type. The precast span method was selected because of good quality of bridge section secured by factory manufacturing, fast construction speed, low construction cost with mechanized construction and the safety fur field workers. The precast span method has been mainly utilized in bridges consisted of repeated simple spans. However, we applied the precast span method to continuous bridge for high-speed railway Since it was the first attempt to apply ate precast span method to a continuous bridge for high-speed railway, many design and construction details were studied and implemented in the construction. Design and construction processes of a continuous bridge construction using tile precast span mettled are briefly described in this paper.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2005.05b
• /
• pp.465-468
• /
• 2005

This Study is concerned workability and the physical properties for practical use of waste concrete powder originated from the manufacturing progress of waste concrete aggregate and it apply to concrete tile. Also because it is important that concrete tile has to ensure the surface moisture stability, for solving the problems aplied curing method is air-dried and autoclave curing. As the result, the physical properties, such as fluent properties, compressive strength, surface hardness and surface glossiness, were decreased with increase of replacement ratio of waste concrete powder, also surface stability was weaked about moisture. But by autoclave curing, it is possible that compressive strength and surface hardness increased, and surface moisture stability is ensured.