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Fawad, U.,Rooh, Gul,Kim, H.J.,Park, H.,Kim, Sunghwan,Jiang, Hua Elsevier 2014 Nuclear instruments & methods in physics research. Vol.764 No.-
<P><B>Abstract</B></P> <P>Mixed crystals of Li<SUB>6</SUB>Gd(BO<SUB>3</SUB>)<SUB>3</SUB> and Li<SUB>6</SUB>Lu(BO<SUB>3</SUB>)<SUB>3</SUB>, Li<SUB>6</SUB>Lu<SUB> <I>x</I> </SUB>Gd<SUB>1−<I>x</I> </SUB>(BO<SUB>3</SUB>)<SUB>3</SUB>, doped with Ce<SUP>3+</SUP> ion are grown by the Czochralski technique (<I>x</I>=0.0, 0.2, 0.5, 0.8, 1.0). The growth problems during the crystal growth process and the technique to overcome them are discussed in detail. Powder X-ray diffraction (XRD) analysis confirms single phase of all the grown samples. Laser induced luminescence spectra are presented. Scintillation properties such as energy resolution, light yield, decay time and α/β ratio under the excitation of γ-rays and α-particles are also presented.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Single crystals of Li<SUB>6</SUB>Lu<SUB> <I>x</I> </SUB>Gd<SUB>1−<I>x</I> </SUB>(BO<SUB>3</SUB>)<SUB>3</SUB>: Ce<SUP>3+</SUP> are grown by Czochralski technique for the first time. </LI> <LI> Single phase of the crystals is been confirmed by X-ray diffraction analysis. </LI> <LI> Scintillation and luminescence properties are measured for the grown crystals. </LI> <LI> The grown crystals have got the potential to become a scintillation detector. </LI> </UL> </P>
Fawad, U.,Kim, H.J.,Park, H.,Kim, Sunghwan,Khan, Sajid Elsevier 2016 Nuclear Instruments & Methods in Physics Research. Vol.806 No.-
<P><B>Abstract</B></P> <P>We report on Czochralski growth of Ce<SUP>3+</SUP>-doped mixed crystals of Li<SUB>6</SUB>Lu(BO<SUB>3</SUB>)<SUB>3</SUB> (LLBO) and Li<SUB>6</SUB>Y(BO<SUB>3</SUB>)<SUB>3</SUB> (LYBO) i.e. Li<SUB>6</SUB>Lu<I> <SUB>x</SUB> </I>Y<SUB>1−<I>x</I> </SUB>(BO<SUB>3</SUB>)<SUB>3</SUB> (<I>x</I>=0.0, 0.5, 1.0) (LLYBO). Problems faced during the growth process and the techniques to overcome them are discussed. Single phase of the grown crystals is confirmed by powder X-ray diffraction (XRD) analysis. The grown crystals are characterized for their scintillation properties such as energy resolution, light yield, fluorescent decay time and <I>α</I>/<I>β</I> ratio under γ-rays and α-particles excitation. The X-ray induced luminescence is measured for the grown crystals.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Single crystals of Li<SUB>6</SUB>Lu<I> <SUB>x</SUB> </I>Y<SUB>1−<I>x</I> </SUB>(BO<SUB>3</SUB>)<SUB>3</SUB>:Ce<SUP>3+</SUP> have been grown by a Czochralski method. </LI> <LI> The single phase of the grown crystals has been confirmed by the XRD analysis. </LI> <LI> Scintillation properties have been measured for the grown crystals. </LI> <LI> Encouraging results from the measurements have confirmed that the grown crystals have got the potential to become a better scintillation detector. </LI> </UL> </P>
The impact of surface morphology on TiAlN film's properties
Fawad Ali,박범수,곽준섭 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
The influence of the surface morphology of titanium aluminum nitride (TiAlN) films, on the hardness and corrosion behavior, was investigated using atomic force microscopy (AFM), scanning electron microscopy (SEM), nano-indentation and potentiodynamic test. With increasing substrate bias voltage and nitrogen flow rate the originally porous and rough surface morphology of the TiAlN films was transferred into a dense and smooth structure. The root mean square (RMS) roughness of the TiAlN films measured using AFM decreased from 3.6 nm to 2.0 nm as the substrate bias was increased from 25 V to 100 V. The experimental results showed that the corrosion resistance and hardness of the coatings increased with decreasing surface roughness. These increases at high substrate bias and high nitrogen flow rate were attributes to the decrease in atomic distance and the reduction in surface porosity
Ensuring Trust and Confidentiality for Adaptive Video Streaming in ICN
Fawad Khan,Hui Li 한국통신학회 2019 Journal of communications and networks Vol.21 No.6
With the dissemination of huge amount of video contentover the internet, information centric networking (ICN) hasemerged as a potential candidate to effectively exploit it and improvethe QoS. ICN decouples content from its location by caching,which can later be retrieved by consumers from their nearest locations. Various experimental studies have depicted the performancemerits of dynamic adaptive streaming via HTTP (DASH) over ICNfor improving QoS. However, there are two challenges that needto be addressed in the context of DASH over an ICN environment. The first one from content consumer domain is that the relevance,integrity, and provenance (RIP) of content should be guaranteed. RIP ensures trust establishment between publisher and consumerof content. The second one that concerns the content publisher isthe confidentiality of DASH media, so that any consumer can viewthe particular quality or resolution of video based on his designatedprivileged rights. We address these two mentioned issues with thecontext of DASH over ICN. The performance and security analysisof our scheme depict its effectiveness for enforcing access control ofadaptive streaming media in an ICN environment.
Effect of number of bi-layers on properties of TiN/ TiAlN multilayer coatings
Fawad Ali,박범수,곽준섭 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
Multilayer coatings TiAlN/TiN were deposited on silicon and SKD61 steel substrates with various numbers of TiN/TiAlN bilayer. The total thickness of the coatings is 500 nm, with different number of bi-layers. The multilayer microstructure was characterized by X-ray diffraction, atomic force microscope, nano-indentation and scanning electron microscopy. It is observed that as the number of bi-layer increased the RMS roughness of the coatings decreased. Also, with the increase in number of bilayers the wear resistance of the multilayer TiN/TiAlN films increased and the hardness decreased. The low hardness of TiAlN/TiN multi-layers and increase in wear resistance is attributed to diffused interfaces.
Fawad, U.,Kim, H.J.,Khan, S.,Khan, M.,Ali, L. Elsevier 2016 SOLID STATE SCIENCES Vol.62 No.-
<P>In this study, lithiumyttrium borate (LYBO) phosphor was doped with various concentrations of trivalent dysprosium ions. To produce these phosphors, the raw materials were sintered. The phase conformation, crystallinity, grain size, and overall morphology of the synthesized phosphors were studied with X-ray diffraction and scanning electron microscopy. The optimized LYBO phosphor, i. e., the LYBO phosphor that exhibited the highest X-ray-and ultraviolet (UV)-induced photoluminescent intensities, had a Dy3+ concentration of 4 mol%. Photoluminescence analysis showed that this phosphor could be easily excited with near-UV light (300-400 nm). The dominant photoluminescence bands were found in the blue (480 nm) and yellow (577 nm) regions of the visible spectrum. The light yield of the X-ray-induced luminescence of the optimized Li6Y(BO3)(3): Dy(3+)was found to be 66% of that of the commercially available X-ray imaging material, Gd2O2S: Tb3+ (GOS). The chromaticity coordinates of the Li6Y(BO3)(3): Dy3+ phosphor were x = 0.34 and y = 0.32, which agree well with achromatic white (x = 0.33, y = 0.33). The results of this study show that the synthesized Li6Y(BO3)(3): Dy(3+)phosphor could be used as X-ray imaging material. (C) 2016 Elsevier Masson SAS. All rights reserved.</P>
Control Indoor Thermal Environment Using MOACON System and Solar Panel in Experimental Pig Barn
( Fawad Khan ),( Qasim Waqas ),( Jayanta Kumar Basak ),( Frank Gyan Okyere ),( Jihoon Park ),( Elanchezhian Arulmozhi ),( Yong Jin Lee ),( Hyeon Tae Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.2
The study deal to control indoor thermal comfort in the pig barn using the solar panels. For this purpose, pig barn was built in Gyeongsang National University with the geographical location of latitude 35° 9 '6.14 "N, longitude 128° 5' 44.40" E, height 44 m. The pig ban dimension was 3.3m wide by 5.4m high by 2.9m high, and the roof and walls were from the expanded polystyrene panel (EPS) 0.05 m thick. In pig barn instruments was the control system of PC for the control program and data storage, MOACON DP-CPU500 (communication part), RS-ADIN4 (analog value input part), CF-DORL8 (output control part), RS-THRT4 (Temperature input unit), SMPS for power supply and six heating lamps. The heating lamps are attached to the solar panel and operating to keep the desired temperature. The weather data, Campbell Scientific, Inc. was installed in front of pig barn for collecting weather data including ambient temperature, amount of solar radiation. The average value was stored in data logger (CR100) and the time interval is 5 minutes. The result showed that the inside temperature increased and reached the desired level (25~28°C) by using the solar panel. Finally, it is confirmed that using solar panels for pig barn is a good solution to maintain thermal comfort and reduce the cost.