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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.,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>
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.,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>
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.
전위된 상완골 과간 골절의 재건판을 이용한 수술적 치료
김려섭 ( Ryuh Sup Kim ),이동주 ( Tong Joo Lee ),문경호 ( Kyoung Ho Moon ),박승림 ( Seung Rim Park ),이문 ( Moon Lee ) 대한골절학회 2007 대한골절학회지 Vol.20 No.2
목 적: 상완골 원위부 과간 골절의 수술적 치료로 주두 갈매기 절골술과 양측 재건판을 이용한 방법의 치료 결과를 분석하였다. 대상 및 방법: 1997년 6월부터 2005년 10월까지 본원에서 상완골 원위부 과간 골절로 수술적 치료를 받은 환자 중 1년 이상 추시 가능한 26예를 대상으로 하였고, 평균 추시기간은 15개월이었다. 주두 절골은 모두 갈매기 절골을 시행하였고, 상완골 원위부 내외측에 재건판을 이용한 내고정술을 시행하였다. 척골신경은 수술 중 모두 확인하였고, 환자의 상완골 원위부의 해부학적 양상상, 재건판을 고정할 때 척골신경을 자극할 것으로 사료되는 3예는 척골 신경 전방 이동술을 시행하였다. 술 후 기능적 평가와 운동범위 평가는 추시 3개월, 6개월, 1년에 Cassebaum의 분류와 Mayo elbow performance score를 이용하였다. 결 과: 평균 골유합 기간은 11.7주였으며, 기능적 평가는 우수 9예, 양호 11예, 보통 4예였다. 운동범위는 평균 굴곡구축 11˚, 후속굴곡 126˚이었다. 결 론: 갈매기 주두 절골 및 재건판을 이용한 양측 내고정술은 타 고정방법에 비하여 비교적 견고한 내고정을 얻을수 있어, 조기 재활치료가 가능하며, 좋은 임상적 결과를 얻을 수 있다. Purpose: To evaluate the therapeutic effects of chevron olecranon osteotomy and bilateral reconstruction plate as operative treatment for distal hum erus intercondylar fracture. Materials and Methods: Among patients operated for distal hum erus intercondylar fracture in our hospital from June, 1997 to October, 2005, 26 patients were selected who could be follow ed-up form ore than one year. The average follow-up period was 15 months. All olecranon osteotom ies were chevron osteotomy and all fractures were treated with internal fixation using bilateral reconstruction plate. The ulnar nerve was checked in all cases. Three patients in which case the plate might irritate the ulnar nerve, received with ulnar nerve anterior transposition. Cassebaum`s classification and Mayo elbow performance score were used to evaluate at three, six and twelve months. Results: Mean bone union period was 11.7 weeks. There were 9 excellent cases, 11 good cases, 4 fair cases and 2 poor cases. Mean flexion contracture was 11˚ and further flexion was 126˚ at last follow-up. Conclusion: Bilateral reconstruction plate internal fixation using chevron olecranon osteotomy showed strong fixation and good clinical results and it is possible for early rehabilitation treatment.