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주필연,조익현,정규원,박영,임동건,이준신,송준태 성균관대학교 2002 학술회의지원논문목록집 Vol.2002 No.-
PZT thin films(35000A) have been prepared onto Pt/Ti/SiO₂/Si substrates with a RF magnetron sputtering system using Pb_(1.05)(Zr_(0.52),Ti_(0.48))O₃ceramic target. We used two-step annealing techniques. As the RTA times and temperatures were increased, crystallization of PZT thin films were enhanced. The ferroelectric characteristics of PZT capacitors fabricated at 700℃ for 60 seconds were like these, remanent polarization were 12.1 μC/㎠, coercive field were 110 kV/cm, leakage current density were 4.1×10^(7) A/㎠, εr - 442, and remanent polarization were decreased by 22% after 10^(10) cycles, respectively.
유리기판위에 증착한 PZT 박막의 전기적특성에 관한 연구
정규원,주필연,박영,이준신,송준태 성균관대학교 2002 학술회의지원논문목록집 Vol.2002 No.-
PZT thin films(4000ꐌÅ) have been prepared onto 1737 corning glass and ITO coated glass substrates with a RF magnetron sputtering system using Pb_1.05(Zr_0.52,Ti_0.48)O₃ ceramic target. Electrical properties of PZT thin film deposited on ITO coated glass were P_r= 15.8 μC/㎠, P_5= 52.2μC/㎠,E_c= 100 kV/cm, J= 3*10^-7 A/㎠. Pr was decreased by 10 % after 10^9 cycles. And in case of corning glass were Pr=8.1 μC/㎠. P_5= 26.7 μC/cm2, E_c= 95 kV/cm, J= 2*10^-6 A/㎠, P_r was decreased by 25 % after 10^9 cycles, respectively. With the RTA treatment duration and temperature increased, the crystallization of PZT thin films were enhanced, however, the leakage current density became higher. The leakage current mechanism was found to be space charge conduction by the defects and oxygen vacancies existing in PZT and PZT/bottom electrode interfaces.
유리기판위에 증착한 50% Pb-excess PZT박막의 전기적특성
정규원,박영,주필연,박기엽,송준태,Jeong, Kyu-Won,Park, Young,Ju, Pil-Yeon,Park, Ki-Yup,Song, Joon-Tae 한국전기전자재료학회 2001 전기전자재료학회논문지 Vol.14 No.5
PZT thin films (3500${\AA}$) ahve been prepared onto Pt/Ti/corning glass (1737) substrates with a RF magnetron sputtering system using Pb$\sub$1.50/(Zr$\sub$0.52/,Ti$\sub$0.48)O$_3$ ceramic target. We used two-step annealing techniques, PZT thin films were grown at a 300$^{\circ}C$ substrate temperature and then subjected to an RTA treatment. In case of 500$^{\circ}C$ RTA temperature show pyrochlore phase. The formation of Perovskite phase started above 600$^{\circ}C$ and PZT thin films generated (101) preferred orientation. As the RTA time and temperature increased, crystallization of PZT films were enhanced. The PZT capacitors fabricated at 650$^{\circ}C$ for 10 minutes RTA treatment showed remanent polarization 30 ${\mu}$C/$\textrm{cm}^2$, saturation polarization 42${\mu}$C/$\textrm{cm}^2$, coercive field 110kV/cm, leakage current density 2.83x10$\^$-7/A/$\textrm{cm}^2$, remanent polarization were decreased by 30% after 10$\^$9/ cycles.
한국산 장님거미목(절지동물문; 거미강)의 미기록 3종보고
하민정(Ha Min-Jung),배지윤(Bae Ji-Yun),천혜연(Chun Hye-Yeon),김주필(Joo-Pil Kim) 한국거미연구소 2004 한국거미 Vol.20 No.2
장님거미 목은 세계적으로 3500여종이 서식하고 우리나라에는 현재까지 몇 종이 서식하는 것인지 확실치 않고, 이에 대한 체계적인 연구 보고가 없어 본 연구에서는 우리나라에서 주로 발견되는 장님거미에 대한 3미기록 종 기재와 문헌, 채집기, 생태적특징, 형태적특징을 요약하여 발표하고자 한다. It is known that 3500 species of Opiliones live in the world and particularly 5~6 species of Opiliones are living in Korea. However, there has not been any systematical research about Opiliones so far. In this paper, we'd like to summarize (md introduce the description of the species, literatures, the site of ecological characteristics and morphologic characteristics of Opiliones.
Korea Barcode of Life Database System (KBOL)
김성민,김원,김창배,민기식,서영배,박종화,우태하,구혜영,최준길,신만균,정종우,송교홍,이한일,황의욱,박영철,어해석,김주필,윤성명,노현수,김사흥,이항,민미숙,김진구,심정자,원용진,이종욱,조수원,서지은,이승환,송준임,한호연,신숙,송성준,박중기,엄기선,박정희 한국통합생물학회 2012 Animal cells and systems Vol.16 No.1
A major concern regarding the collection and storage of biodiversity information is the inefficiency of conventional taxonomic approaches in dealing with a large number of species. This inefficiency has increased the demand for automated, rapid, and reliable molecular identification systems and large-scale biological databases. DNA-based taxonomic approaches are now arguably a necessity in biodiversity studies. In particular, DNA barcoding using short DNA sequences provides an effective molecular tool for species identification. We constructed a large-scale database system that holds a collection of 5531 barcode sequences from 2429 Korean species. The Korea Barcode of Life database (KBOL, http://koreabarcode.org) is a web-based database system that is used for compiling a high volume of DNA barcode data and identifying unknown biological specimens. With the KBOL system, users can not only link DNA barcodes and biological information but can also undertake conservation activities, including environmental management, monitoring, and detecting significant organisms.