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박귀옥,박수빈,최윤석,김지만 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Lithiation-delithiation reactions in Li-ion batteries are often accompanied by an electrochemically driven huge volume changes of anode materials between the lithium-free and lithiated-host states, resulting in a gradual capacity fading. Minimizing the volume changes of electrode during cycling is essential to guarantee the electrochemical behaviors and go far in innovating design of electrode materials for Li storage. Here, we develop ordered mesoporous CoSn intermetallic anode materials with various Co/Sn atomic ratios, to prove a dual-buffer effect for accommodating the volume changes by not only the generation of repeated void nano-spaces but also the incorporation of electrochemically inactive element. We also provide novel insights into the nanostructural changes of electrode materials during lithiationdelithiation process by in operando small angle X-ray scattering investigations.
Highly Ordered Mesoporous Antimony-Doped SnO2 Materials for Lithium-Ion Battery
박귀옥,형은별,손정국,김한수,김지만 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.6
Highly ordered mesoporous antimony-doped tin oxide (ATO) materials, containing different amount of antimony in the range of 0–50 mol%, are prepared via a nanoreplication method using a mesoporous silica template. The mesoporous ATO materials thus obtained exhibit high electrical conductivity, high reversible capacity, superior cycle stability and good rate capability as anode materials for lithium-ion batteries, compared to those of pure mesoporous tin oxide. Amongst the ATO materials in this work, the mesoporous ATO material with 10 mol% of antimony has highest discharge capacity of 1940 mAhg-1 (charge capacity of 1049) at the 1st cycle, best cycle performance (716 mAhg-1 at 100th cycle) and excellent rate capability, which are probably due to the enhanced electrical conductivity as well as reduced crystalline size
2006-2007년 소아 급성 하기도 감염증에서 유행한 메타뉴모바이러스의 유행 및 임상 양상
박귀옥,이재희,이정주,윤신원,임인석,이동근,최응상,유병훈,이미경,채수안,김지현 대한소아청소년과학회 2009 Clinical and Experimental Pediatrics (CEP) Vol.52 No.3
Purpose : The causes of acute lower respiratory tract infection (ALRTI) are mostly attributable to viral infection, including respiratory syncytial virus (RSV), parainfluenza virus (PIV), influenza virus A/B (IFV A/B), or adenovirus (ADV). Several Korean studies reported human metapneumovirus (hMPV) as a common pathogen of ALRTI. However, studies on seasonal distribution and clinical differences relative to other viruses are insufficient, prompting us to perform this study. Methods : From November 2006 to October 2007, we tested nasopharyngeal aspiration specimens in children hospitalized with ALRTI with the multiplex reverse transcriptase-polymerase chain reaction to identify 6 kinds of common pathogen (hMPV, RSV, PIV, IFV A/B, and ADV). We analyzed positive rates and clinical features by respiratory chart review. Results : We detected 38 (8.4%) hMPV-positive cases out of 193 (41.8%) virus-positive specimens among 462 patients. HMPV infection prevailed from March to June with incidence peaking in April. HMPV-positive patients were aged 15 years (76.3%), and the ratio of boys to girls was 1.2:1. The median age was 27 months. HMPV primarily caused pneumonia (76.3 %) (P=0.018). Average hospitalization of HMPV-associated ALRTI patients was 5.8 days. In addition, they showed parahilar peribronchial infiltration (100%) on chest X-ray, normal white blood cell count (73.7%), and negative C-reactive protein (86.8 %) (P>0.05). All hMPV-positive patients recovered without complication. Conclusion : HMPV is a common pathogen of ALRTI in Korean children, especially in 1-5 year olds, from March to May. Immunocompetent children diagnosed with hMPV-associated ALRTI may have a good prognosis. 목 적 : 급성 하기도 감염은 소아 환자들에 있어 가장 흔한 질환 중에 하나로, RSV, PIV, IFV A/B, ADV 등이 흔한 원인으로 알려져 있으며, 2001년 이후로 hMPV 또한 주요 원인 바이러스 중의 하나로 밝혀졌다. 하지만 hMPV의 검출율, 유행 양상이 다른 호흡기 바이러스와 어떤 차이가 있는지에 대해서는 국내 연구가 충분하지 않아 본 연구를 시행하였다. 방 법 : 2006년 11월부터 2007년 10월까지 중앙대학교병원 소아청소년과에 급성 호흡기 감염증으로 입원한 환아들을 대상으로 입원 첫 날에 비인두 흡입물을 채취하여 다중 역전사 연쇄중합반응을 시행하여 흔한 호흡기 바이러스 6종(hMPV, RSV, PIV, IFV A/B, ADV)을 분리하였고, 각 바이러스의 검출율과 임상증세를 분석하여 hMPV 양성 환아가 다른 바이러스 감염과 어떠한 차이를 보이는지 연구하였다. 결 과 : 462명 중 193명(41.8%)에서 바이러스가 검출되었으며, 그 중 38명(19.7%)이 hMPV로 나타났다. hMPV가 검출된 환아들의 연령은 1-5세가 대부분이었고(76.3%), 나이의 중앙값은 27개월, 남녀비는 1.2:1이었다. 월별로는 3월부터 5월까지 집중되었고, 4월에 21명(55.3%)으로 절정을 이루었다. 진단명은 폐렴이 가장 흔하였고 이는 29명(76.3%)을 차지하였고(P=0.018), 다음으로는 세기관지염 5명(13.2%), 기관지염 2명(2.6%), 크룹 1명(2.6%), 천식의 급성 악화 1명(2.6%) 순으로 나타났다. 평균 재원 일수는 5.8일 정도였고, 흉부 방사선 소견은 폐문 주위의 기관지침윤 양상(100%)을 보였으며, 대부분에서 백혈구수는 정상(73.7%), C-반응 단백은 음성(86.8 %)으로 나타났으며(P>0.05), hMPV 관련 급성 하기도 감염증으로 확인된 모든 환아들의 예후는 양호했다. 결 론 : 우리 나라에서 면역력이 양호한 1-5세 환아가 3월에서 5월 사이에 급성 하기도 감염으로 내원하는 경우, hMPV에 의한 감염의 가능성을 염두에 두어야 한다. HMPV 관련 급성 하기도 감염증으로 진단시 일반적으로 양호한 경과를 예측할 수 있겠다.
박귀옥,박수빈,김경호,전보경,김지만 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
We herein report an in operando probing of mesoscopic structural changes in ordered mesoporous electrode materials during cycling with synchrotron-based small angle X-ray scattering (SAXS) technique. In operando SAXS studies combined with electrochemical and other physical characterizations straightforwardly show how porous electrode materials underwent volume changes during the whole process of charge and discharge, with respect to their own reaction mechanism with lithium. This comprehensive information on the pore dynamics as well as volume changes of the electrode materials will not only be critical in further understanding of lithium ion storage reaction mechanism of materials, but also enable the innovative design of high performance nanostructured materials for next generation batteries.
박귀옥,윤정배,윤원섭,김지만 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
We demonstrate a mesoporous molybdenum dioxide material with abnormal lithium storage site, which exhibits a discharge capacity of 1814 mAh g<sup>-1</sup> for the first cycle, more than twice than its theoretical value, and maintains its initial capacity after 50 cycles. Contrary to previous reports, we find that a mechanism for the high and reversible lithium-storage capacity of the mesoporous molybdenum dioxide electrode is not based on conversion reaction. Insight into the electrochemical results, obtained by in situ X-ray absorption, scanning transmission electron microscopy analysis combined with electron energy loss spectroscopy and computational modeling, indicates that the nano-scale pore engineering of this transition metal oxide enables an unexpected electrochemical mass storage reaction mechanism, and provides a promising paradigm for the design of cation storage materials for battery systems.
경력이 단절된 치과위생사의 직무 복귀에 대한 치과의사의 의견
박귀옥 ( Kui-ok Park ),장영은 ( Young-eun Jang ),김선일 ( Sun-il Kim ),박지은 ( Ji-eun Park ),이선미 ( Sun-mi Lee ),김남희 ( Nam-hee Kim ) 한국치위생학회(구 한국치위생교육학회) 2016 한국치위생학회지 Vol.16 No.5
Objectives: This study aims to identify dentists` opinions about the return to work of the dental hygienists with career interrupted. Convenience sampling was made of 22 dentists with the clinical experience (about 0.25%) of the 4,944 members of Gyeonggi-do Dental Association. Data were collected through an electronic survey using e-mails and telephone interviews and analyzed using the constant comparison method. Methods: Open coding was assigned to the initial data from the survey in an explicit language, and focusing on the types of their employment, working conditions, etc. Summarization and conceptualization were made of the second data in an implicit language. Results: Most of the dentists were found to have positive attitudes toward the return to work of career interrupted dental hygienists and hope to adjust their wages based on their job performance or after their probational period expires. Most of the dentists were found to have positive attitudes towards the hygienists` flexible working although their concerns about work efficiency and hospital atmosphere. This study is a qualitative study that describes dentists` opinions and presents the need for the career interrupted dental hygienists to return to work. Conclusions: The study proposed that the educational institutions should take into account the hygienists` opinions when implementing the programs for promoting their return to work and their evaluative studies.