• 한국정보디스플레이학회:학술대회논문집
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• 2007.08b
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• pp.1149-1151
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• 2007

As a follow-up to our previous work we present in this paper some experimental results on LED light recycling. Specifically we demonstrate for the first time that screen brightness can be increased using our light pipe based light recycling scheme for reallife projection display applications.

• Resources Recycling
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• v.7 no.3
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• pp.42-51
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• 1998

Hydrogen in atmosphere can easily dissolve in melt of light metal alloys. Increasing demand for recycling of light metal a alloys has, therefore, focused attention on the removal of hydrogen gas, and alloy addition in melt has become an imporLant r refining process. For this purpose behaviors of mixing and hydrogen degassing in impeller agitated refming vessel with/without barnes were investigated. Flow patterns, mixing time behavior and kinetics of degassing in various agitating conditions were analysed in watet model experiments. And, numerical analysis on turbulent flow pattern in impeller agitated vessels was performed.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.05a
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• pp.7-12
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• 2003

In scrapped material field, about ten millions ton of waste plastic materials are produced in korea. However recycling rate of waste plastic materials have above 25%. Therefore, it is urgently needed that they are used as recycled materials in order to prevent environment pollution and grain economic profits. In this paper, physical and mechanical properties of light weight concrete using waste plastic materials for aggregates are described in order to develop a light weight concrete with the aggregate made from waste plastic goods, it was carried out many experiments on mix proportion and strength. According to the experimental results, high-strength mortar was necessary to make light weight concrete using aggregate of waste plastic materials. Especially, considering the side of recycling of plastic wastes, it is recommended that recycled aggregates made from waste plastic materials is applied to light weight concrete.

• Nuclear Engineering and Technology
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• v.43 no.4
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• pp.329-334
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• 2011

Two conceptual flowsheets were developed for recycling used nuclear fuel. One flowsheet was developed for recycling used oxide nuclear fuel from light water reactors while the other was developed for recycling used metal fuel from fast spectrum reactors. Both flowsheets were developed from a set of design principles including efficient actinide recovery, nonproliferation, waste minimization and commercial viability. Process chemistry is discussed for each unit operation in the flowsheet.

• Resources Recycling
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• v.21 no.3
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• pp.65-73
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• 2012

There are several kinds of displays such as liquid crystal display (LCD), cathode ray tube (CRT), plasma display panel(PDP), light emitting diode (LED), organic light emitting diode (OLED), etc. Nowadays, recycling technologies of waste displays have been widely studied from economy and efficiency points of view. In this paper, patents and literature on the recycling technologies of the waste displays have been comprehensively analyzed. The search was limited to the open patents of USA (US), European Union (EU), Japan (JP), and Korea (KR) and SCI journals published from 1980 to 2011. Patents and journals were systematically compiled and collected using key-words search and filtered by pre-set filtering criteria. The trends of the patents and journals were thus analyzed according to the years, countries, companies, and technologies.

• Journal of the Korean Wood Science and Technology
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• v.21 no.1
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• pp.21-38
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• 1993

In order to investigate the influence of recycling, a laboratory method simulating the papermaking process was used for assessing the effects of recycling on fiber properties. Sw-BKP, Hw-BKP and BGP were disintegrated and beaten to about 42$^{\circ}$SR-44$^{\circ}$SR by a valley beater. After beating, these pulps were dewatered by centrifuge and dried at 90$^{\circ}C$ for 72hrs. This recycling process(sequence of wetting, defiberating, dewatering and drying) was repeated seven times. Physical, mechanical and optical properties of recycled pulps were evaluated by TAPPI Standards. Morphological changes occurred through recycling process was observed by SEM. Sheet density decreased with recycling. The largest drop in density occurred during the first recycling. The porosity values decreased with recycling. Mechanical properties such as tensile, burst strength and folding endurance, decreased with recycling. However tear strength of Sw-BKP and mixtured pulp increased at the first recycling. Optical properties such as brightness, opacity and light scattering coefficient, increased with recycling. However, brightness of mixtured pulp gradually decreased with recycling. Fibrillated outer layer of the fiber was gradually removed from the surface with recycling. As a result of recycling, crinkles on the fiber surface were found to be more folded.

• Journal of the Korean Society of Visualization
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• v.4 no.2
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• pp.81-87
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• 2006

In this paper, we present flow patterns around and performance of an air-flow separator by using the numerical analysis. With this separator, particles of different density are to be separated by using the drag force from the air flow. The low-density particles are designed to be separated by using inhalation through holes on a rotating drum. To obtain the flow informations needed for determining the proper design parameters, we have performed numerical simulations by using a commercial code, ANSYS CFX. Various parameter set was tested and it was found that depending on the design of drums there exist critical parameter set regarding the attachment of light particles on the drum, which is prerequisite for the separation of materials. We present here the possibility of using the present design in separation of particles mixed in the clod for use in recycling.

• Proceedings of the Korea Concrete Institute Conference
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• 2005.05b
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• pp.457-460
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• 2005

The stone powder sludges, which are occurred in aggregate production company, have classified the specified waste, so taking place the environment pollution and the disposal cost. In this causes, the stone powder sludge is required the development of recycling technique. This study concerned with the using possibility of stone powder sludge on light weight concrete. We acquired the fundamental date on recycling technique of stone sludges, by hydro-thermal reaction. The results shows that it is possible to develop the light weight concrete, having various range of properties according to the content of foam.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2007.04a
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• pp.75-78
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• 2007

The recycling program about waste concrete is being progressed to national research. But research on waste concrete powder which is occurred in control process of concrete powder is not enough. Waste concrete powder includes in $SiO_2,\;Al_2O_3$, and CaO so that the create of tobermorite is possibile through Hydrothermal Syntesis Reaction. Tobermorite have an advantage of high strength, sulphuric acid resistance and the lower drying shrinkage. Accordingly, this study investigate in properties of light-weight foamed concrete made with waste concrete powder. As a results, light-weight foamed concrete made with waste concrete powder is the higher than stone powder sludge of density and porosity, and the tower compressive strength. Therefore, it is thought that light-weight foamed concrete using waste concrete powder is possible.

• Resources Recycling
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• v.16 no.4
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• pp.61-67
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• 2007

In viewpoints of environmental and resource conservation, it is desirable to utilize fly ash generated from domestic coal power stations as light constructive material. Furthermore, the demand of light constructive materials has been increased as many building tend to become highly multistory buildings. In demonstration of converting fly ash to light constructive materials, the Dwight-Lloyd kiln of which the operation is relatively easy and the reliability very high has been informed to be only commercialized plant over the world. In this review, Dwight-Lloyd kiln plant operated at Oomura coal power station in Japan is explained. Circular grate kiln, Shaft kiln, Rotary kiln plants that are under developed is also introduced.