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Oh, Jeong Rok,Cho, Sang-Hwan,Park, Hoo Keun,Oh, Ji Hye,Lee, Yong-Hee,Rag, Young The Optical Society 2010 Optics express Vol.18 No.11
<P>This paper reports the possibility of a facile optical structure to realize a highly efficient monochromatic amber-emitting light-emitting diode (LED) using a powder-based phosphor-converted LED combined with a long-wave pass filter (LWPF). The capping of a blue-reflecting and amber-passing LWPF enhances both the amber emission from the silicate amber phosphor layer and the color purity due to the blocking and recycling of the pumping blue light from the InGaN LED. The enhancement of the luminous efficacy of the amber pc-LED with a LWPF (phosphor concentration 20 wt%, 39.4 lm/W) is 34% over that of an amber pc-LED without a LWPF (phosphor concentration 55 wt%, 29.4 lm/W) at 100 mA and a high color purity (>96%) with Commission International d'Eclairage (CIE) color coordinates of x=0.57 and y=0.42.</P>
Oh, Sung Rok,Lee, Chul Goo,Choi, Yung Wang Trans Tech Publications, Ltd. 2018 Key Engineering Materials Vol.789 No.-
<P>In this paper, the flow characteristics of a lightweight formed magnesia composite usingsuper absorbent polymer as base material for biological panels were evaluated. The experimentalparameters were evaluated with respect to the flow of the mortar according to the water binder ratio(W/B), the volume ratio of fine aggregate (Vs/Vm), the amount of foaming agent (FM) and theamount of super absorbent polymer (SAP). Statistical analysis was performed on the flow obtainedthrough the experiment and the influence coefficient on the flow quality was obtained. The flowquality prediction model equation of the magnesia composite is proposed through the obtainedinfluence coefficient. The proposed model equation shows that the experimental and predicted valuesare over 90%.</P>
Oh, Sung Rok,Kim, Ki Hyung,Choi, Yung Wang Trans Tech Publications, Ltd. 2018 Key Engineering Materials Vol.789 No.-
<P>In this paper, the compressive strength quality characteristics of lightweight formedmagnesia composite using super absorbent polymer as basic material for biological panels wereevaluated. The experimental parameters were evaluated with respect to the compressive strength ofthe mortar according to the water binder ratio (W/B), the volume ratio of fine aggregate (Vs/Vm), theamount of foaming agent (FA) and the amount of super absorbent polymer (SAP). Statistical analysiswas performed on the compressive strength obtained through the experiment and the influencecoefficient on the compressive strength quality was obtained. The compressive strength qualityprediction model equation of the magnesia composite is proposed through the obtained influencecoefficient. The proposed model equation shows that the experimental and predicted values are over80%.</P>
Effect of cement powder based self-healing solid capsule on the quality of mortar
Oh, Sung-Rok,Choi, Yun Wang,Kim, Yong Jic Butterworth Scientific ; 2019 Construction and Building Materials Vol.214 No.-
<P> In this study, self-healing solid capsule (SHC) were prepared by using cement powder for crack self-healing of concrete structure. The plain mix was selected that considering the loss ratio of capsule and dispersibility. Mixing rate of solid capsule were 5, 10 and 15% based on cement mass. The mortar with solid capsule were investigated for the basic quality such as flow, air content, compressive strength, splitting tensile strength, elastic moduli and dry shrinkage. The focus of this paper is to evaluate the effect of solid capsule mixing on the quality of mortar instead of self-healing effects of solid capsule. Experimental results show that the flowability decreases and the air content increases as the mixing rate of SHC increase. And the compressive, splitting tensile strength and elastic moduli tended to decreases as the mixing rate of SHC increase. The effect of particle size show that the flowability increases and the air content decreases as the particle size of SHC becomes larger. And, the compressive, splitting tensile strength and elastic moduli tended to increases as the particle size of SHC becomes larger. </P>