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Ryu, H.,Bartwal, K. S. WILEY-VCH Verlag 2009 Crystal research and technology Vol.44 No.1
<P>Phosphor material BaAl<SUB>2</SUB>O<SUB>4</SUB>:Eu<SUP>2+</SUP>, Cr<SUP>3+</SUP> with varying concentrations of Cr co-doping were prepared by solid-state synthesis method. Crystalline fibres were obtained by controlled annealing temperature. Synthesized compositions were characterized for their phase and crystallinity by powder x-ray diffraction. The crystalline morphology was investigated using SEM analysis. High resolution transmission electron microscopy (HRTEM) in image and diffraction modes was used to investigate the microstructure. The effect of Cr doping on quality and morphology of grown crystals was investigated. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Ryu, H.,Baek, J.H.,Choi, M.G.,Lee, J.C.,Chang, S.K. Pergamon Press ; Elsevier Science Ltd 2017 Tetrahedron letters: the international organ for t Vol.58 No.30
We developed a simple Cu<SUP>2+</SUP>-selective turn-on fluorescence signaling probe based on the hydrolysis of 1-pyrenecarbohydrazide (1) to 1-pyrenecarboxylic acid. Probe 1 exhibited prominent fluorescence signaling of Cu<SUP>2+</SUP> ions in a 10% aqueous Tris-buffered (pH 7.0) DMSO solution with a detection limit of 5.93x10<SUP>-8</SUP>M. Signaling with control compounds derived from pyreneacetic acid and pyrenebutyric acid showed that the fluorescence signal became less pronounced as the distance between the hydrazide functionality and the pyrene fluorophore increased. As a practical application, this probe was employed for the determination of Cu<SUP>2+</SUP> in a simulated semiconductor wastewater.
Ryu, H.,Jeong, Y.,Kang, J.H.,Cho, K.N. North-Holland Pub. Co 2016 Computer physics communications Vol.209 No.-
<P>Modelling of multi-million atomic semiconductor structures is important as it not only predicts properties of physically realizable novel materials, but can accelerate advanced device designs. This work elaborates a new Technology-Computer-Aided-Design (TCAD) tool for nanoelectronics modelling, which uses a sp(3)d(5)s(*) tight-binding approach to describe multi-million atomic structures, and simulate electronic structures with high performance computing (HPC), including atomic effects such as alloy and dopant disorders. Being named as Quantum simulation tool for Advanced Nanoscale Devices (Q-AND), the tool shows nice scalability on traditional multi-core HPC clusters implying the strong capability of large-scale electronic structure simulations, particularly with remarkable performance enhancement on latest clusters of Intel Xeon Phi (TM) coprocessors. A review of the recent modelling study conducted to understand an experimental work of highly phosphorus-doped silicon nanowires, is presented to demonstrate the utility of Q-AND. Having been developed via Intel Parallel Computing Center project, Q-AND will be open to public to establish a sound framework of nanoelectronics modelling with advanced HPC clusters of a many-core base. With details of the development methodology and exemplary study of dopant electronics, this work will present a practical guideline for TCAD development to researchers in the field of computational nanoelectronics. (C) 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.</P>
Ryu, H.,Ha, K.W.,Baek, D. IET 2016 Electronics letters Vol.52 No.6
<P>A new low-power current-reuse quadrature voltage-controlled oscillator (QVCO) is proposed. The proposed QVCO couples two complementary current-reuse Armstrong voltage-controlled oscillators (VCOs) using series coupling switches. The current-reuse technique reduces the power consumption, and the transformer-based Armstrong configuration improves the phase noise performance by increasing the negative G(m) of the VCO core. The proposed QVCO consumes 2.46 mW of power at 8.71 GHz from a 1.1 V supply. The measured phase noise is -113.3 dBc/Hz at the offset frequency of 1 MHz, and the figure of merit is -188.2 dBc/Hz. The frequency tuning range is from 8.34 to 9.13 GHz. The chip area is 700 x 340 m(2) in a 0.13 m CMOS process.</P>
Ryuh, Youngsun,Noh, Kwang Mo,Park, Joon Gul Korean Society for Agricultural Machinery 2014 바이오시스템공학 Vol.39 No.2
Purposes: This study was to validate the Robotic Smart Work System that can provides better working conditions and high productivity in unstructured environments like bio-industry, based on a tele-operation system for fruit harvesting with low cost 3-D positioning system on the laboratory level. Methods: For the Robotic Smart Work System for fruit harvesting and cultivation management in agriculture, a vision based tele-operating system and 3-D position information are key elements. This study proposed Robotic Smart Farming, an agricultural version of Robotic Smart Work System, and validated a 3-D position information system with a low cost omni camera and a laser marker system in the lab environment in order to get a vision based tele-operating system and 3-D position information. Results: The tasks like harvesting of the fixed target and cultivation management were accomplished even if there was a short time delay (30 ms ~ 100 ms). Although automatic conveyor works requiring accurate timing and positioning yield high productivity, the tele-operation with user's intuition will be more efficient in unstructured environments which require target selection and judgment. Conclusions: This system increased work efficiency and stability by considering ancillary intelligence as well as user's experience and knowhow. In addition, senior and female workers will operate the system easily because it can reduce labor and minimized user fatigue.