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Diffusing-wave spectroscopy study of microscopic dynamics of three-dimensional granular systems
Kim, Kipom,Pak, Hyuk Kyu Royal Society of Chemistry 2010 SOFT MATTER Vol.6 No.13
<P>Probing micron-scale dynamics is important in understanding the dynamic property of granular systems. Diffusing-wave spectroscopy, which makes use of multiply scattered light in a highly dense solution of small particles, has been used successfully to study various fluidized-granular systems, such as; channel flow, gas-fluidized beds, avalanche flow, and vibro-fluidized beds. This paper summarizes this method and the existing findings, which include the dynamic behaviour on a short time scale and jamming transition on a long time scale. In addition, the analogy between the jamming transition of granular systems and the glass transition of traditional liquid/solid systems is discussed.</P> <P>Graphic Abstract</P><P>In this review, we introduce the diffusing-wave spectroscopy techniques that have been successfully applied for probing micron-scale dynamics in various fluidized-granular systems, and summarize the methods and existing findings. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b926799a'> </P>
Lossless Brownian Information Engine
Paneru, Govind,Lee, Dong Yun,Tlusty, Tsvi,Pak, Hyuk Kyu American Physical Society 2018 Physical Review Letters Vol.120 No.2
<P>We report on a lossless information engine that converts nearly all available information from an errorfree feedback protocol into mechanical work. Combining high-precision detection at a resolution of 1 nm with ultrafast feedback control, the engine is tuned to extract the maximum work from information on the position of a Brownian particle. We show that the work produced by the engine achieves a bound set by a generalized second law of thermodynamics, demonstrating for the first time the sharpness of this bound. We validate a generalized Jarzynski equality for error-free feedback-controlled information engines.</P>
Thermal stabilities, physical and optical properties of K₂O-Na₂O-Nb₂O5-TeO₂ glasses /
Jeong, Euh Duck,Ha, Myoung Gyu,Pak, Hyuk Kyu,Ryu, Bong Ki,Borse, Pramod H,Lee, Jae Sung,Komatsu, Takayuki,Kim, Hae Jin,Kim, Hyun Gyu The Korean Society of Industrial and Engineering C 2006 Journal of industrial and engineering chemistry Vol.12 No.6
Second harmonic generation and fabrication of transparent K₂O-Na₂O-Nb₂O5-TeO₂ glass-ceramics /
Jeong, Euh Duck,Borse, Pramod H,Lee, Jae Sung,Ha, Myoung Gyu,Pak, Hyuk Kyu,Komatsu, Takayuki,Kim, Hyun Gyu The Korean Society of Industrial and Engineering C 2006 Journal of industrial and engineering chemistry Vol.12 No.5
Breathing, crawling, budding, and splitting of a liquid droplet under laser heating
Song, Chaeyeon,Moon, Jong Kyun,Lee, Kyuyong,Kim, Kipom,Pak, Hyuk Kyu The Royal Society of Chemistry 2014 Soft Matter Vol.10 No.15
<P>The manipulation of droplets with sizes on the millimetre scale and below has attracted considerable attention over the past few decades for applications in microfluidics, biology, and chemistry. In this paper, we report the response of an oil droplet floating in an aqueous solution to local laser heating. Depending on the laser power, distinct dynamic transitions of the shape and motion of the droplet are observed, namely, breathing, crawling, budding, and splitting. We found that the selection of the dynamic modes is determined by dynamic instabilities due to the interplay between the convection flows and capillary effects. Our findings can be useful for constructing microfluidic devices to control the motion and shape of a small droplet by simply altering the laser power, and for understanding thermal convective systems with fully soft boundaries.</P> <P>Graphic Abstract</P><P>We report the response of an oil droplet floating in an aqueous solution to local laser heating. Depending on the laser power, distinct dynamic transitions of the shape and motion of the droplet are observed, namely, breathing, crawling, budding, and splitting. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2sm27207e'> </P>
RF 마그네트론 스퍼터링에서 증착거리와 증착온도가 무기 액정 배향막의 물리적 성질에 미치는 영향에 대한 연구
박정훈,손필국,김기범,박혁규,Park, Jeung-Hun,Son, Phil-Kook,Kim, Ki-Pom,Pak, Hyuk-Kyu 한국재료학회 2008 한국재료학회지 Vol.18 No.10
We present the structural, optical, and electrical properties of amorphous silicon suboxide (a-$SiO_x$) films grown on indium tin oxide glass substrates with a radio frequency magnetron technique from a polycrystalline silicon oxide target using ambient Ar. For different substrate-target distances (d = 8 cm and 10 cm), the deposition temperature effects were systematically studied. For d = 8cm, oxygen content in a-$SiO_x$ decreased with dissociation of oxygen onto the silicon oxide matrix; temperature increased due to enlargement of kinetic energy. For d = 10 cm, however, the oxygen content had a minimum between $150^{\circ}\;and\;200^{\circ}$. Using simple optical measurements, we can predict a preferred orientation of liquid crystal molecules on a-$SiO_x$ thin film. At higher oxygen content (x > 1.6), liquid crystal molecules on an inorganic liquid crystal alignment layer of a-$SiO_x$ showed homogeneous alignment; however, in the lower case (x < 1.6), liquid crystals showed homeotropic alignment.