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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.
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.
지승도 한국시뮬레이션학회 1998 한국시뮬레이션학회 논문지 Vol.7 No.2
This paper presents an automated methodology for campus network design and performance analysis using the rule-based SES and DEVS modeling & simulation techniques. Proposed methodology for structural design and performance analysis can be utilized not only in the early stage of network design for selecting configurable candidate from all possible design alternatives, but also in simulation verification for generating performance data. Our approach supercedes conventional methodologies in that, first, it can support the configuration automation by utilizing the knowledge of design expert ; second, it can provide the simulation-based performance evaluation ; third, it is established on the basis of the well-formalized framework so that it can support a hierarchical and modular system design. Several simulation tests performed on a campus network example will illustrate our technique.
호두 껍데기, 자궁, 그리고 햄릿의 감옥 ―『햄릿』과 매큐언의 『호두 껍데기』
지승아 ( Seung-a Ji ) 21세기영어영문학회 2021 영어영문학21 Vol.34 No.4
This article examines Hamlet’s dilemma that turns his ontological question into an ethical practice in Shakespeare’s Hamlet and its adaptation in McEwan’s Nutshell. As a prequel to Hamlet, Nutshell rethinks Hamlet’s dilemma from the perspective of a nine-month-old fetus Hamlet. Hamlet, who feels trapped in a nutshell, wants to die to end his weary life. On the contrary, the fetus Hamlet, who is enclosed tightly in a womb, has a strong will to live. While Hamlet hesitates to avenge his father’s death because he is skeptical about the ghost’s claims, the fetus Hamlet casts aside his thought of revenge even though he witnesses the murder of his father by his mother and uncle. The fetus Hamlet should acquiesce to the murder to be born safe and free outside the prison. Here is his ethical dilemma between his filial duty and desire to experience the world. Hamlet’s death remains in silence, while the fetus Hamlet’s life remains in chaos. The birth of the fetus Hamlet sets him free from the womb but will bring him ceaseless bad dreams. Although Nutshell can be read as McEwan’s answer to Hamlet’s silence, the fetus Hamlet’s chaos, however, like a Möbius strip, seems to curve back to the enigmatic silence. This claustrophobic loop symbolizes Hamlet’s dilemma from the womb and the prison to the castle Elsinore and the nutshell. The enigmatic silence in Hamlet still leaves us a very tough task to report Hamlet’s tragic narrative properly.
편지 쓰기, 상상적 여성 담론 공동체와 마가렛 카벤디쉬의 『사교 편지』
지승아 ( Seung-a Ji ) 한국영미문학페미니즘학회 2016 영미문학페미니즘 Vol.24 No.2
Margaret Cavendish`s Sociable Letters is not a collection of her letters to real persons but that of her fictional letters to an imagined female addressee. Cavendish discusses a variety of social, political, and cultural issues with the addressee, and her letters can be read as a critical epistolary conversation. As early modern English women were generally unable to participate in political events and public discourses, they used letters as a medium of self-expression and social interaction. Letter writing was for them a self-conscious activity through which they intervened in a masculine world of learning and constructed an alternative female discursive community. Cavendish gives advice on love and marriage, discusses political issues, and criticizes literary works in her letters. I pay particular attention to the way in which Cavendish constructs epistolary space as a form of theater. In this epistolary theater, I contend Cavendish builds an intellectual female network, constituting women as reading and writing subjects. Though her letters are fictional, it is crucial that they are not one-sided interchange but mutual, intersubjective cultural practices. Ultimately letter writing is for Cavendish a creative, rhetorical strategy designed to generate a reading public that responds to a wide variety of her thoughts and writings.
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.