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공공도서관의 테마전시 이용에 따른 이용자의 도서관 인식 및 이용행태 변화 연구
정유라,이지연 한국정보관리학회 2017 정보관리학회지 Vol.34 No.2
We investigated the user behavior of the theme display provided by the public libraries as an active information service. Specifically, we wanted to study the library patrons’ library use behavior and perception. There were in-depth interviews with seven librarians and eight patrons to develop a set of research questions and the questionnaire. We conducted the survey with 232 patrons then the statistical analysis. The analysis result revealed that the theme display helped the patrons’ wider use of the library resources and also positively affected patrons’ perception on the librarians as well as the evaluation of the library services. Based on the findings, we recommended the active incorporation of the theme display within the limitation of the libraries’ facility and patrons’ interests. 본 연구는 도서관에서 제공하는 적극적 정보제공 서비스로서의 테마전시 이용행태를 조사하고, 그 효과로서 이용자의 도서관 이용행태 변화와 인식변화를 확인하고자 하였다. 테마전시를 제공하는 3개 도서관의 7명의 사서와 8명의 이용자 심층인터뷰를 통해 연구 질문 및 설문지를 개발하고, 232명의 이용자를 대상으로 설문 및 통계분석을 수행하였다. 분석 결과 테마전시 서비스가 이용자들의 다양한 자료이용을 도울 뿐 아니라, 사서에 대한 인식 및 도서관 평가에 긍정적인 변화를 주고 있음을 확인할 수 있었다. 이를 토대로 각 도서관의 환경과 이용자층에 맞춰 테마전시를 적극적으로 수행할 것을 제안하였다.
정유라,이철,강진아 연세대학교 경영연구소 2020 연세경영연구 Vol.57 No.2
Overseas R&D subsidiaries contribute to the cross-border knowledge sourcing of multinational corporation (MNC) headquarters by providing tacit and context-specific knowledge and reducing the search costs borne by the headquarters. This study examines how overseas R&D subsidiaries allow their headquarters to source local knowledge from the host country in an efficient way. The study also investigates the effect on overseas knowledge sourcing which derives from the external embeddedness of an overseas R&D subsidiary in the local network of the host country upon experiencing the alliance with local entities. In addition, the degree of knowledge digestibility that each headquarters retains as a condition by which host country knowledge sourcing of headquarters can be effectively facilitated by the host country R&D subsidiary is also investigated. The study tests the hypotheses established with the data of geographical distribution of overseas R&D subsidiaries of 162 multinationals which were included on the Fortune 500 MNC list in the year 2008 and the patent data of each firm along with the alliance and financial data. The study provides empirical evidence that the headquarters can benefit from the existence of a R&D subsidiary when it exists in a host country with abundant knowledge. Moreover, the findings suggest that the headquarters having a degree of knowledge digestibility will reinforce the role of host country R&D subsidiary on host country knowledge acquisition, learning, and innovation of the headquarters.
저온소성 TiO2 페이스트를 이용한 염료감응 태양전지의 특성 연구
정유라,김은미,구할본 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.5
본 연구에서는 TiO2 입자간의 우수한 네트워크와 TiO2 박막과 FTO 기판과의 접착특성을 향상시키기 위하여 TiO2 페이스트 제작시 TTIP를 첨가하여 저온 소성용 TiO2 페이스트를 제조 및 광전극에 이용함으로써 염료감응 태양전지의 전기화학적 특성을 향상시켰다. TiO2 페이스트에 TTIP를 첨가하여 TiO2 입자간의 네트워크와 기판과의 접착특성을 향상시켜 빛에 의해 여기된 전자가 염료의 기저상태 또는 전해질의 산화/환원 준위로의 재결합을 방지하여 전자가 투명 전도성 FTO 기판까지의 이동이 용이하여 전류밀도 및 광전변환효율 특성을 향상시켰다. TTIP를 이용한 염료감응 태양전지의 전자전달시간은 4.3×10-3 s로 빠르고 전자재결합시간을 3.0×10-2 s로 느려 free-binder 샘플에 비해 높은 전류밀도 및 광전변환효율을 나타내었다. TTIP를 첨가한 염료감응 태양전지의 Voc, Jsc, FF 및 η은 각각 0.72 V, 7.66 mA cm-2, 64.11% 및 3.54%로 FP2의 광전변환효율의 약 1.3배 향상되었다. In this paper, we have developed a low temperature process to make two type of paste by using TiO2 nanoparticles(P25). The interconnections between substrate and TiO2 films or link between particles of free-binder paste(FP1, FP2, FP3) is very poor. Therefore, the Titanium(Ⅳ) isopropoxide was added to the TP paste to improve the interconnection. Electron transport time (τt) and recombination time (τr) are analyzed by IMPS (intensity-modulated photocurrent spectroscopy) and IMVS(Intensity-modulated photovoltage spectroscopy). In the results, τt of TP paste based DSSCs (about 4.3×10-3) is faster than other samples. τr is longer from 2.7×10-2 s of FP2 to 3.0×10-2 s of TP. A solar conversion efficiency (DSSCs) of TP is 3.54% for an incident solar energy of 100 mW cm-2 (meanwhile, 2.70% for DSSCs with FP2). The conversion efficiency is increased by 1.3 times.
저온소성 TiO<sub>2</sub> 페이스트를 이용한 염료감응 태양전지의 특성 연구
정유라,구할본,Jung, You-Ra,Jin, En Mei,Gu, Hal-Bon 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.5
In this paper, we have developed a low temperature process to make two type of paste by using $TiO_2$ nanoparticles(P25). The interconnections between substrate and $TiO_2$ films or link between particles of free-binder paste(FP1, FP2, FP3) is very poor. Therefore, the Titanium(IV) isopropoxide was added to the TP paste to improve the interconnection. Electron transport time (${\tau}_t$) and recombination time (${\tau}_r$) are analyzed by IMPS (intensity-modulated photocurrent spectroscopy) and IMVS(Intensity-modulated photovoltage spectroscopy). In the results, ${\tau}_t$ of TP paste based DSSCs (about $4.3{\times}10^{-3}$) is faster than other samples. ${\tau}_r$ is longer from $2.7{\times}10^{-2}$ s of FP2 to $3.0{\times}10^{-2}$ s of TP. A solar conversion efficiency (DSSCs) of TP is 3.54% for an incident solar energy of 100 mW $cm^{-2}$(meanwhile, 2.70% for DSSCs with FP2). The conversion efficiency is increased by 1.3 times.
정유라,이소라,손평수,최성호 한국응용과학기술학회 2015 한국응용과학기술학회지 Vol.32 No.3
An enantioselective recognition of D- and L-tryptophan (Trp)-b-cyclodextrin (CD) inclusion complex was performed using electrochemical and FT-Raman spectroscopic analysis. From the electrochemical analysis, the selectivity coefficient (KDL) of b-CD inclusion complexes was found higher than that of the D- and L-Trp in phosphate buffered saline (PBS, pH=7.0) solution. The percentage of enantioselectivity (I%ee) for peak current of D-Trp-b-CD inclusion complexes was observed higher than that of L-Trp-b-CD inclusion complexes in PBS solution. From Raman spectroscopy, chemical shift difference (D, cm-1) for the C=C stretch, ring vibration, and ring breathing of D-Try-b-CD inclusion complex were observed higher than that of L-Trp-b-CD inclusion complex. The electrochemical and Raman spectroscopic analyses were found very useful for chiral detection of racemic amino acid in the presence of b-CD.