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외부전계 인가에 의한 조화용융조성 LiNbO<sub>3</sub> 결정의 주기적 분극반전
권순우,양우석,이형만,김우경,이한영,윤대호,송요승,Kwon, Soon-Woo,Yang, Woo-Seok,Lee, Hyung-Man,Kim, Woo-Kyung,Lee, Han-Young,Yoon, Dae-Ho,Song, Yo-Seung 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.11
When an electric field higher than a characteristic coercive field is applied to a ferroelectric such as $LiNbO_3$, the orientation of the spontaneous polarization is reversed, which causes the reversal of the sign of odd-rank tensor properties such as electro-optic and nonlinear optic coefficients. A fabrication process of insulator and periodic external field assisted poling of a z-cut $LiNbO_3$ have been optimized for a periodic $180^{\circ}$ phase inversion along z-axis. The poling jig and the poling control system, fully controlled by a computer, for high quality and reproducible PPLN fabrication have been devised. Periodically polarization reversed PPLN was adjusted based on the fabricated thickness of insulator. The poling structure of PPLN was observed under a microscope after etching PPLN samples by an etching solution ($HF:HNO_3$ = 1 : 2) for about 15 min.
권순우 한국특수교육학회 2005 특수교육학연구 Vol.40 No.3
오늘날 청각장애학교는 제7차 교육과정의 국민공통기본교육과정을 적용하게 되면서 학교중심 교육과정을 개발할 책무성을 가지게 되었다. 본 연구에서는 1994년부터 학교교육과정을 재구조화하고 이를 적용한 청각장애학교를 선정하여 그 학교에 재직한 교사 9명을 대상으로 면담 등을 통하여 학교교육과정 재구조화의 필요성, 재구조화된 교육과정의 운영, 실현 과정에서 나타난 장단점 등을 분석하고 청각장애학교 교육의 시사점을 제시하였다. 본 연구의 결과로서 청각장애 학교교육과정의 재구조화는 교사가 중심이 되고 선택한 수화 또는 구화의 이분적 시각보다는 청각장애학생의 기초 학력 신장과 바람직한 자아 정체성에 긍정적인 영향을 미칠 수 있는 학생중심 교육과정으로 편성운영되어야 한다는 결론을 제시하고 있다. The restructure of school curriculum based on the seventh curriculum in the nation level which means the standard curriculum is an essential activity to educate all children in the schools including school for the deaf. Therefore the school for the Deaf has to develop the school-centered curriculum based on standard curriculum. However the gaps between the school curriculum and the standard curriculum are existed due to the various unique characteristics of the students with hearing impairment unlike the hearing students. The purpose of this study is to illustrate why the restructure of school curriculums for the deaf is necessary. A deaf school which has managed with restructuring school curriculum for the deaf students since 1994 is selected for this qualitative case study. The research methods such as interview, observation, and video photograph and analysis are utilized to illustrate the requisite, procedure, application, and merits and demerits in the school curriculum for the deaf. Nine teachers, one vice principal, three teachers with school affairs, a kindergarten teacher, three teachers below three years teaching experiences, and two teachers who transferred to other schools were participated for this study. Therefore this study suggests that the restructuring school curriculum for the deaf students is focused and developed what are the educational effects based on social and cultural characteristics of the deaf students, not teachers- and hearing-centered thoughts, and standard curriculum itself in the national level.
외부전계 인가에 의한 조화용융조성 LiNbO3 결정의 주기적 분극반전
권순우,양우석,이한영,윤대호,송요승,이형만,김우경 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.11
When an electric field higher than a characteristic coercive field is applied to a ferroelectric such as LiNbO3, the orientation of the spontaneous polarization is reversed, which causes the reversal of the sign of odd-rank tensor properties such as electro-optic and nonlinear optic coefficients. A fabrication process of insulator and periodic external field assisted poling of a z-cut LiNbO3 have been optimized for a periodic 180 phase inversion along z-axis. The poling jig and the poling control system, fully controlled by a computer, for high quality and reproducible PPLN fabrication have been devised. Periodically polarization reversed PPLN was adjusted based on the fabricated thickness of insulator. The poling structure of PPLN was observed under a microscope after etching PPLN samples by an etching solution (HF:HNO3=1:2) for about 15 min.
권순우,김종식,송재경,류진창,Kwon, Soon-Wo,Kim, Jong-Shik,Song, Jae-Kyeong,Ryu, Jin-Chang 한국토양비료학회 2000 한국토양비료학회지 Vol.33 No.4
고추 시설 재배지 토양, 근권과 근면등으로부터 형광성 pseudomonads를 분리한 후 이들 중 35균주에 대해 계통 분석을 실시하였다. 계통 분석에 이용된 분류키는 165 rDNA의 일부 염기서열로, 종 수준에서 분류동정을 실시하였다. 고추재배지로부터 분리된 형광성 pseudomonads중 P. putida group으로 분류된 균주는 17균주 였으며, 이들은 주로 비근권 토양으로부터 분리되었다. 이들은 4개의 소그룹 (subgroup I, II, III, IV)으로 분류되었으며, 소그룹 I, IV에 속한 균주는 P putida의 표준균주가 속한 소그룹 II, III의 균주와는 분류학적으로 뚜렸히 구분되는 독특한 균주들이었다. P. fluorescens로 분류된 균주는 15균주였으며, 나머지 3균주는 P. fluorescens와 P. chloraphis의 중간 그룹으로 분류되었다. 근권으로부터 분리된 균주는 대부분 P. fluorescns로 분류되었으며, 이들의 유전적 유연관계는 매우 높게 나타났다. 본보의 결과에 비추어 볼 때, 고추의 근계는 P. fluorescens의 특정 균주에 의해 정착되는 것으로 생각되었다. Among the fluorescent pseudomonad isolates from soil- root system of red pepper in Chinju, Kyunsangnam-Do, the phylogenetic analysis for 35 isolates were conducted. The partial 16S ribosomal DNA sequences were used as taxonomic key for phylogenetic analyses, and these sequences were enabled to identification of the fluorescent pseudomonad isolates on the species level. The 17 isolates among them were classified into Pseudomonas putida group, and consisted of the strains isolated mainly from soil. This group were subdivided into 4 subgroups (I, II, III, and IV). The subgroup I and IV were unique ones which were relatively remotely related with subgroup II and III including the type strain of P. putida. The 15 isolates among 35 isolates were grouped along with the type strain of Pseudomonas fluorescens, and 3 isolate were characterized as intermediates of P. fluorescens and Pseudomonas chlororaphis. Most of strain isolateds from the rhizosphere soil and rhizoplane of red pepper were identified as P. fluorescens and closely related with each other. In this study, root of red pepper was supposed to be colonized by a specific strain or strains of P. fluorescens.