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PAD법으로 제작된 산화코발트-산화주석 복합체의 가스 감응 특성
안세용,이위,장동미,정혁,김도진,An, Sea-Yong,Li, Wei,Jang, Dong-Mi,Jung, Hyuck,Kim, Do-Jin 한국재료학회 2010 한국재료학회지 Vol.20 No.11
A cobalt oxide - tin oxide nanocomposite based gas sensor on an $SiO_2$ substrate was fabricated. Granular thin film of tin oxide was formed by a rheotaxial growth and thermal oxidation method using dc magnetron sputtering of Sn. Nano particles of cobalt oxide were spin-coated on the tin oxide. The cobalt oxide nanoparticles were synthesized by polymer-assisted deposition method, which is a simple cost-effective versatile synthesis method for various metal oxides. The thickness of the film can be controlled over a wide range of thicknesses. The composite structures thus formed were characterized in terms of morphology and gas sensing properties for reduction gas of $H_2$. The composites showed a highest response of 240% at $250^{\circ}C$ upon exposure to 4% $H_2$. This response is higher than those observed in pure $SnO_2$ (90%) and $Co_3O_4$ (70%) thin films. The improved response with the composite structure may be related to the additional formation of electrically active defects at the interfaces. The composite sensor shows a very fast response and good reproducibility.
안세용,코르티즈크리스토퍼,진범주 한국국방연구원 2015 국방정책연구 Vol.30 No.4
The most uses of spreadsheet program such as Excel in ROK military analysis are managing various data such as inputs & outputs for other modeling programs and visual analysis such as making charts or graphs from statistics data. But, in recent days, Excel is used in broader ways in various areas because it provides not only powerful functions including math, logics, statistics, and combination of those, but also programming capabilities through VBA. Operations Analysis Branch(OAB) in CFC Korea has performed Theatre Level Counter-Fire Study in 2012. The study focused on the contribution level of the components which participate in Counter-Fire process, whereas this paper describes the modeling to approach the matter and effectiveness & usability of the simplified tool using Microsoft Excel.
안세용(Seyong Ahn),김태환(Taewhan Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
The power consumed by clock network and its portion in the system have been increasing. To mitigate this trend, a concept of LC resonant clock network was proposed and it has been studied and implemented by many research groups. Recently, a study which utilize LC resonant clock in the presence of DVFS was introduced. However, so far, the previous works have not been addressed the issue of multi-corner analysis on LC resonant clock. In this work, multi-corner analysis is applied to the LC resonant clock generated by previously proposed algorithm. In our analysis, wire and transistor variations are considered. Through ISPD 2010 bench marks and HSPICE simulation, analysis results on power consumption, global clock skew, and peak-to-peak voltage swing are presented. Compared to the typical case, about 27.5% power reduction, 13% voltage swing reduction and up to 50% skew increases are observed.
안세용(Se-Yong An),박정훈(Jung-Hoon Park),김정선(Jung-Sun Kim),오희국(Hee-Kook Oh),최중민(Joong-Min Choi) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1B
최근에 많이 연구되어지고 있는 에이전트는 기존 응용프로그램들보다 뛰어난 유연성과 적응성을 갖고 보다 나은 서비스를 제공하고 있다. 또한 멀티 에이전트 시스템과 에이전트간 통신 언어를 이용하여 에이전트들이 서로 협동을 통해 공동의 목적을 달성하기도 한다. 본 논문에서는 멀티 에이전트 기술을 워크플로우 시스템에 적용하여 시스템 확장의 용이함과 작업흐름의 유연성 및 환경변화에 대한 좀더 나은 대처 능력을 제공한다. 또한 에이전트 표준화 단체인 FIPA의 권고안을 수용하고 에이전트 통신 언어로 널리 쓰이는 KQML과 유사한 형태의 통신언어를 사용함으로써 다른 에이전트 시스템과의 협동 작업이 용이하도록 구현하였다.
산화아연-단일벽탄소나노튜브복합체의 일산화질소 감지 특성
장동미,안세용,정혁,김도진,Jang, Dong-Mi,Ahn, Se-Yong,Jung, Hyuck,Kim, Do-Jin 한국재료학회 2010 한국재료학회지 Vol.20 No.11
Semiconducting metal oxides have been frequently used as gas sensing materials. While zinc oxide is a popular material for such applications, structures such as nanowires, nanorods and nanotubes, due to their large surface area, are natural candidates for use as gas sensors of higher sensitivity. The compound ZnO has been studied, due to its chemical and thermal stability, for use as an n-type semiconducting gas sensor. ZnO has a large exciton binding energy and a large bandgap energy at room temperature. Also, ZnO is sensitive to toxic and combustible gases. The NO gas properties of zinc oxide-single wall carbon nanotube (ZnO-SWCNT) composites were investigated. Fabrication includes the deposition of porous SWCNTs on thermally oxidized $SiO_2$ substrates followed by sputter deposition of Zn and thermal oxidation at $400^{\circ}C$ in oxygen. The Zn films were controlled to 50 nm thicknesses. The effects of microstructure and gas sensing properties were studied for process optimization through comparison of ZnO-SWCNT composites with ZnO film. The basic sensor response behavior to 10 ppm NO gas were checked at different operation temperatures in the range of $150-300^{\circ}C$. The highest sensor responses were observed at $300^{\circ}C$ in ZnO film and $250^{\circ}C$ in ZnO-SWCNT composites. The ZnO-SWCNT composite sensor showed a sensor response (~1300%) five times higher than that of pure ZnO thin film sensors at an operation temperature of $250^{\circ}C$.
임현철,찬드라세카,장동미,안세용,정혁,김도진,Lim, Hyun-Chul,Chandrasekar, P.V.,Chang, Dong-Mi,Ahn, Se-Yong,Jung, Hyuk,Kim, Do-Jin 한국재료학회 2010 한국재료학회지 Vol.20 No.4
Hybridization of semiconductor materials with carbon nanotubes (CNTs) is a recent field of interest in which new nanodevice fabrication and applications are expected. In this work, nanowire type GaAs structures are synthesized on porous single-wall carbon nanotubes (SWCNTs) as templates using the molecular beam epitaxy (MBE) technique. The field emission properties of the as-synthesized products were investigated to suggest their potential applications as cold electron sources, as well. The SWCNT template was synthesized by the arc-discharge method. SWCNT samples were heat-treated at $400^{\circ}C$ under an $N_2/O_2$ atmosphere to remove amorphous carbon. After heat treatment, GaAs was grown on the SWCNT template. The growth conditions of the GaAs in the MBE system were set by changing the growth temperatures from $400^{\circ}C$ to $600^{\circ}C$. The morphology of the GaAs synthesized on the SWCNTs strongly depends on the substrate temperature. Namely, nano-crystalline beads of GaAs are formed on the CNTs under $500^{\circ}C$, while nanowire structures begin to form on the beads above $600^{\circ}C$. The crystal qualities of GaAs and SWCNT were examined by X-ray diffraction and Raman spectra. The field emission properties of the synthesized GaAs nanowires were also investigated and a low turn-on field of $2.0\;V/{\mu}m$ was achieved. But, the turn-on field was increased in the second and third measurements. It is thought that arsenic atoms were evaporated during the measurement of the field emission.
박정훈(Jung-Hoon Park),안세용(Se-Yong An),최중민(Joongmin Choi) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ
최근의 에이전트 시스템 연구는 간단한 작업을 처리하는 단일 에이전트들이 모여 하나의 서비스를 제공하는 멀티 에이전트 시스템 분야에서 활발히 이루어지고 있다. 이러한 멀티 에이전트 시스템에서는 요구된 서비스를 구성원들이 효율적으로 협동하여 제공하기 위해 이들을 통합하고 실행순서 등을 조정하는 것이 중요하다. 본 논문에서는 계획, 그룹, 작업의 세가지 단계로 구분되는 규칙과 ECA 규칙을 사용하여 계층적 작업흐름을 정의하고 이를 통하여 에이전트들을 조정하는 방법을 제안한다. 계층적 작업흐름의 사용으로 기존의 방법과 달리 에이전트를 계층화하여 새로운 서비스를 구성할 경우 세부적인 수행사항에 대한 언급없이 상위 단계에 계획 규칙만을 지정하여 구성할 수 있는 장점이 있다.