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x mol% 칼시아-안정화 지르코니아 나노분말의 수열합성 및 구조적 특성평가
류제혁,문정인,박연경,송정환,김택남,Ryu, Je-Hyeok,Moon, Jung-In,Park, Yeon-Kyung,Nguyen, Tuan Dung,Song, Jeong-Hwan,Kim, Taik-Nam 한국재료학회 2012 한국재료학회지 Vol.22 No.5
Pure zirconia and $x$ mol% calcia partially stabilized zirconia ($x$ = 1.5, 3, and 8) nanopowders were synthesized by hydrothermal method with various reaction temperatures for 24 hrs. The precipitated precursor of pure zirconia and $x$ mol% calcia doped zirconia was prepared by adding $NH_4OH$ to starting solutions; resulting sample was then put into an autoclave reactor. The optimal experimental conditions, such as reaction temperatures and times and amounts of stabilizer CaO, were carefully studied. The synthesized $ZrO_2$ and $x$ mol% CaO-$ZrO_2$ ($x$ = 1.5, 3, and 8) powders were characterized by XRD, SEM, TG-DTA, and Raman spectroscopy. When the hydrothermal temperature was as low as $160^{\circ}C$, pure $ZrO_2$ and $x$ mol% CaO-$ZrO_2$ ($x$ = 1.5 and 3) powders were identified as a mixture of monoclinic and tetragonal phases. However, a stable tetragonal phase of zirconia was observed in the 8 mol% calcia doped zirconia nanopowder at hydrothermal temperature above $160^{\circ}C$. To observe the phase transition, the 3 mol% CaO-$ZrO_2$ and 8 mol% CaO-$ZrO_2$ nanopowders were heat treated from 600 to $1000^{\circ}C$ for 2h. The 3 mol% CaO-$ZrO_2$ heat treated at above $1000^{\circ}C$ was found to undergo a complete phase transition from mixture phase to monoclinic phase. However, the 8 mol% calcia doped zirconia appeared in the stable tetragonal phase after heat treatment. The result of this study therefore should be considered as the preparation of 8 mol% CaO-$ZrO_2$ nanopowders via the hydrothermal method.
Low-Power Systolic Array Viterbi Decoder Implementation With A Clock-gating Method
류제혁,조준동,Ryu Je-Hyuk,Cho Jun-Dong Korea Information Processing Society 2005 정보처리학회논문지 A Vol.12 No.1
본 논문에서는 trace-back systolic array Viterbi algorithm의 저전력 생존 메모리 구현에 관한 새로운 알고리즘을 소개한다. 이 알고리즘의 핵심 아이디어는 trace back 연산의 수를 줄이기 위하여 이미 생성된 trace-back routes를 재사용하는 것이다. 그리고 trace-back unit의 불필요한 switching activity가 발생하는 영역을 gate-clock을 사용하여 전력소모를 줄이는 것이다. Synopsys Power Estimation 툴인 Design Power를 이용하여 전력소모를 측정하였고, 그 결과 [1]의 논문에서 소개된 trace-back unit 비하여 평균 $40{\%}$ 전력감소가 있었고, $23{\%}$의 면적증가를 보였다. This paper presents a new algorithm on low power survivor path memory implementation of the trace-back systolic array Viterbi algorithm. A novel idea is to reuse the already-generated trace-back routes to reduce the number of trace-back operations. And the spurious switching activity of the trace-back unit is reduced by making use of a clock gating method. Using the SYNOPSYS power estimation tool, DesignPower, our experimental result shows the average $40{\%}$ power reduction and $23{\%}$ area increase against the trace-back unit introduced in [1].
Clock-gating 방법을 사용한 저전력 시스톨릭 어레이 비터비 복호기 구현
류제혁,조준동 한국정보처리학회 2005 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.12 No.1
This paper presents a new algorithm on low power survivor path memory implementation of the trace-back systolic array Viterbi algorithm. A novel idea is to reuse the already-generated trace-back routes to reduce the number of trace-back operations. And the spurious switching activity of the trace-back unit is reduced by making use of a clock gating method. Using the SYNOPSYS power estimation tool, DesignPower, our experimental result shows the average 40% power reduction and 23% area increase against the trace-back unit introduced in [1]. 본 논문에서는 trace-back systolic array Viterbi algorithm의 저전력 생존 메모리 구현에 관한 새로운 알고리즘을 소개한다. 이 알고리즘의 핵심 아이디어는 trace-back 연산의 수를 줄이기 위하여 이미 생성된 trace-back routes를 재사용하는 것이다. 그리고 trace-back unit의 불필요한 switching activity가 발생하는 영역을 gate-clock을 사용하여 전력소모를 줄이는 것이다. Synopsys Power Estimation 툴인 Design Power를 이용하여 전력소모를 측정하였고, 그 결과 [1]의 논문에서 소개된 trace-back unit에 비하여 평균 40% 전력감소가 있었고, 23%의 면적증가를 보였다.
류제혁(Jaeheok Ryu),정성문(Seongmoon Chung),김재용(Jaeyong Kim),김지훈(Jihoon Kim),김형기(Hyungkee Kim) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
It was proposed to improve the exclusive vehicle interior regarding customer`s needs and behaviors in gaze analysis method. It doesn`t show much difference between product function and quality, because of promoting technologies. But nowadays it is still limited to give a satisfaction to customers and to be selected by customers in automobile industry. It was suggested alternatives to enhance the customer`s satisfactions. This study will contribute to increasing the customers` satisfaction and convenience.