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Ba치환된 $Pb(Mg_{1/3}Nb_{2/3})O_3$-$PbTiO_3$-$PbZrO_3$계 세라믹스의 압전 및 변위특성에 관한 연구
지승한,이덕출,이능헌 한국전기전자재료학회 1997 電氣電子材料學會誌 Vol.10 No.1
In this study, piezoelectric actuator samples were fabricated using 0.375PMN-0.37OPT-0.255PZ system ceramics with Barium substitution and the strain properties of them were investigated. Dielectric constant of the specimens increased with the increase of Ba content up to 5mol% and decreased with futher addition of Ba. The largest piezoelectric coefficient and electromechanical coupling coefficient were observed at the sintering temperature of 1250'C and Barium content of 5mol%. The characteristics of strain hysteresis was found largely with varing the sintering temperature on the single round type, and the strain is proportional to piezoelectric coefficient.
PLMN계 세라믹스의 유전 및 전기적 특성에 관한 연구
지승한,이능헌,김용혁,김진수,이희규,이덕출 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
In this paper Dielectric and polarizable properties of 0.9Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.1PbTiO_(3) Ceramics have been investigated as a addition of the amount of La_(2)O_(3)(0≤x≤0.05). The Temperature-dependant electrostictive characteristics of 0.9PMN-0.1PT relaxor ferroelectic system were improved by enhencing the extent of the diffuse phase transition(DPT). This was achieved using PMN-PTceramics by the partial substitution of La at the Pb site. The curie temperature and the maximum dielectic permittivity decreased by substituting La and the electic field-related hysteresis phenomena decreased with increasing La substitution amount.
지승한,권상직,Ji, Seung-Han,Kwon, Sang-Jik 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.2
Dielectric and piezoelectric properties of $0.57Pb(Sc_{1/2}Nb_{1/2})O_{3}-0.43PbTiO_{3}$, which is the morphotropic phase boundary composition for the PSN-PT system, were investigated as a function of $Fe_{2}O_{3},\;Nb_{2}O_{5}\;and\;MnO_{2}$ addition 0 wt% to 0.9 wt%. The maximum dielectric constant of ${\varepsilon}_{33}/{\varepsilon}_{o}=2054$ and the minimum dielectric loss of $tan{\delta}=0.37\;%$ at room temperature were obtained at 0.1 wt% of $Fe_{2}O_{3}$ and 0.5 wt% of $MnO_{2}$ addition, respectively. With addition of 0.5 wt% $Nb_{2}O_{5}$ and $0.5\;wt%\;MnO_{2}$, the electromechanical coupling factor $k_{p}$ and mecanical quality factor $Q_{m}$ were significantly increased, respectively. The maximum electromechanical coupling factor $k_{p}=61.5\;%$ was obtained by addition of $Nb_{2}O_{5}$ and high mechanical quality factor $Q_{m}=919$ was obtained by addition of $MnO_{2}$. The $Q_{m}(=919)$ value is 3.3 times larger than that of non-doped 0.57PSN-0.43PT ceramics.
지승도 한국시뮬레이션학회 1999 한국시뮬레이션학회 논문지 Vol.8 No.2
The main purpose of this paper is to design and implement forest fire information system (FOFIS) for effective prevention of forest fire using GIS, database, 3-D graphics, and simulation techniques. In contrast to conventional fire information systems that are mostly based on the 2-D graphics and analytic modeling approaches, we have proposed the cell-based modeling approaches, i.e., spatial, data, and simulation modeling approaches. The cell-based spatial modeling is proposed by eliminating the cliff effect of the typical elevation model so that it can provide realistic 3-D graphics of the forest fire. The cell-based data modeling of geography, meteorology, and forestry information is also proposed. The cell-based dynamic modeling for forecasting of the fire diffusion is developed using the variable structure modeling techniques. Several simulation tests of FOFIS performed on a sample forest area of Chungdo, Kyungsangbukdo will demonstrate our approaches.
피보호자 모니터링 시스템을 위한 환경음 기반 상황 인식
지승은,조준영,이충근,오시원,김우일,Ji, Seung-Eun,Jo, Jun-Yeong,Lee, Chung-Keun,Oh, Siwon,Kim, Wooil 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.2
본 논문에서는 모바일 기반의 피보호자 모니터링 시스템 적용을 위한 환경음 기반의 상황 인식 기술을 소개한다. 상황 인식 실험을 위해 총 7가지의 음향 환경으로 나누어 환경음을 취득한다. 환경음 인식 성능 비교를 위해 MFCC와 LPCC 특징 추출 기법을 이용한다. 통계적 기반의 패턴인식 기법을 적용하기 위해 GMM 및 HMM 음향 모델을 기반으로 인식기를 설계한다. 인식 실험 결과에서는 LPCC 특징 추출 기법이 MFCC 기법 보다 우수하고, 음향 모델은 HMM이 GMM에 비해 높은 인식 성능을 나타낸다. LPCC 특징을 사용하고 HMM 모델을 채용함으로써 최고 96.03%의 인식률을 나타낸다. 이와 같은 결과는 음성에 비하여 다양한 주파수 성분이 존재하는 환경음을 표현하는데 MFCC 보다는 LPCC가 효과적임을 나타내며, 시간에 따라 변하는 특성을 갖는 환경음은 GMM 보다 HMM이 효과적임을 입증한다. This paper presents a context recognition method using environmental sound signals, which is applied to a mobile-based client monitoring system. Seven acoustic contexts are defined and the corresponding environmental sound signals are obtained for the experiments. To evaluate the performance of the context recognition, MFCC and LPCC method are employed as feature extraction, and statistical pattern recognition method are used employing GMM and HMM as acoustic models, The experimental results show that LPCC and HMM are more effective at improving context recognition accuracy compared to MFCC and GMM respectively. The recognition system using LPCC and HMM obtains 96.03% in recognition accuracy. These results demonstrate that LPCC is effective to represent environmental sounds which contain more various frequency components compared to human speech. They also prove that HMM is more effective to model the time-varying environmental sounds compared to GMM.
에이전트 기반의 인간 미개입형 함정전투 M&S 시스템 설계 및 서해교전 사례연구
지승도,유용준,정찬호,이장세,김재익,Chi, Sung-Do,You, Yong-Jun,Jung, Chan-Ho,Lee, Jang-Se,Kim, Jae-Ick 한국시뮬레이션학회 2008 한국시뮬레이션학회 논문지 Vol.17 No.2
Most battleship warfare M&S systems run relatively slow and the simulation results are often unfair since the system should interact with human operators(controller and/or gamer). To deal with these problems, we have proposed the agent-based battleship warfare M&S system which interact with multiple agent systems instead of human operators. Agent-based M&S system may be able to efficiently support the analysis of effectiveness and/or the operational tactics development of given warfare by providing autonomous reasoning capabilities without the intervention of human controller. To do this, the paper propose the design concept and methodology using the advanced modeling and simulation framework as well as autonomous agent design principle. Several simulation tests performed on the battleship warfare case study on Korea Yellow sea will illustrate our techniques. 대부분의 함정 전투체계의 교전 시뮬레이션은 필수적으로 운용자(통제관 및 대항군)가 포함될 수밖에 없음으로 인해 시뮬레이션은 실시간 정도의 저속이며, 시뮬레이션 결과도 객관적인 평가가 어렵다. 이러한 문제를 다루기 위해 본 논문에서는 인간 대신 다중 에이전트 시스템을 이용하는 에이전트 기반의 함정전투 M&S 시스템을 제안한다. 에이전트기반 M&S 시스템은 인간의 개입을 배제하고 자율적 추론기능을 제공함으로써 전투체계의 효과도 분석 및 운용전술개발 등께 대한 효과적인 지원을 가능하게 해준다. 본 논문에서는 이를 위하여 첨단 M&S 프레임워크와 자율 에이전트 설계 원칙을 도입함으로써 인간 미개입형 M&S 시스템 설계 개념과 방법론을 제시하였고, 서해교전상의 함정전투 사례연구를 통해 그 타당성을 검증하였다.