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Choi, Jimin,Nam, Donghyeon,Shin, Dongyeeb,Song, Youngkwon,Kwon, Cheong Hoon,Cho, Ikjun,Lee, Seung Woo,Cho, Jinhan American Chemical Society 2019 ACS NANO Vol.13 No.11
<P>One of the most critical issues in preparing high-performance transparent supercapacitors (TSCs) is to overcome the trade-off between areal capacitance and optical transmittance as well as that between areal capacitance and rate capability. Herein, we introduce a TSC with high areal capacitance, fast rate capability, and good optical transparency by minimizing the charge transfer resistance between pseudocapacitive nanoparticles (NPs) using molecular linker- and conductive NP-mediated layer-by-layer (LbL) assembly. For this study, bulky ligand-stabilized manganese oxide (MnO) and indium tin oxide (ITO) NP multilayers are LbL-assembled through a ligand exchange reaction between native ligands and small multidentate linkers (tricarballylic acid). The introduced molecular linker substantially decreases the separation distance between neighboring NPs, thereby reducing the contact resistance of electrodes. Moreover, the periodic insertion of ITO NPs into the MnO NP-based electrodes can lower the charge transfer resistance without a meaningful loss of transmittance, which can significantly improve the areal capacitance. The areal capacitances of the ITO NP-free electrode and the ITO NP-incorporated electrode are 24.6 mF cm<SUP>-2</SUP> (at 61.6% transmittance) and 40.5 mF cm<SUP>-2</SUP> (at 60.8%), respectively, which outperforms state of the art TSCs. Furthermore, we demonstrate a flexible symmetric solid-state TSC that exhibits scalable areal capacitance and optical transmittance.</P> [FIG OMISSION]</BR>
Radiopaque markers and hydrogram in feline alimentary lymphoma
Choi, Jihye,Lee, Jinsoo,Jang, Jaeyoung,Choi, Heeyeon,Seo, Jimin,Lee, Minjung,Kim, Hyunwook The Korean Society of Veterinary Science 2012 大韓獸醫學會誌 Vol.52 No.2
Radiography, ultrasonography with hydrogram, and contrast studies using radiopaque markers were applied to evaluate alimentary lymphoma in two cats. The hydrogram facilitated the differentiation of pseudo-thickening from true wall thickening, and enabled an evaluation of wall layering and lymph nodes. In case 1, mechanical obstruction of the duodenum was confirmed with barium-impregnated polyethylene spheres (BIPS), a radiopaque marker; however, results obtained in case 2 were not as definitive. We expect that hydrograms and BIPS can be used as valuable alternative methods to evaluate the gastrointestinal (GI) tract although further studies in cases involving GI tumors are needed.
Choi Miyoung,Lee Hyeon-Jeong,Yu Su-Yeon,Kim Jimin,Park Jungeun,Ryoo Seungeun,Kim Inho,Park Dong Ah,Yoon Young Kyung,Joh Joon-Sung,Park Sunghoon,Yun Ki Wook,Choi Chi-Hoon,Kim Jae-Seok,Shin Sue,Kim Hyun 대한의학회 2023 Journal of Korean medical science Vol.38 No.23
Background: In Korea, during the early phase of the coronavirus disease 2019 (COVID-19) pandemic, we responded to the uncertainty of treatments under various conditions, consistently playing catch up with the speed of evidence updates. Therefore, there was high demand for national-level evidence-based clinical practice guidelines for clinicians in a timely manner. We developed evidence-based and updated living recommendations for clinicians through a transparent development process and multidisciplinary expert collaboration. Methods: The National Evidence-based Healthcare Collaborating Agency (NECA) and the Korean Academy of Medical Sciences (KAMS) collaborated to develop trustworthy Korean living guidelines. The NECA-supported methodological sections and 8 professional medical societies of the KAMS worked with clinical experts, and 31 clinicians were involved annually. We developed a total of 35 clinical questions, including medications, respiratory/critical care, pediatric care, emergency care, diagnostic tests, and radiological examinations. Results: An evidence-based search for treatments began in March 2021 and monthly updates were performed. It was expanded to other areas, and the search interval was organized by a steering committee owing to priority changes. Evidence synthesis and recommendation review was performed by researchers, and living recommendations were updated within 3–4 months. Conclusion: We provided timely recommendations on living schemes and disseminated them to the public, policymakers and various stakeholders using webpages and social media. Although the output was successful, there were some limitations. The rigor of development issues, urgent timelines for public dissemination, education for new developers, and spread of several new COVID-19 variants have worked as barriers. Therefore, we must prepare systematic processes and funding for future pandemics.
최지민(Choi, Jimin),정광호(Jung, KwangHo),김순은(Kim, SoonEun) 한국지방정부학회 2013 지방정부연구 Vol.17 No.4
본 연구는 정치단위의 규모(population size)가 정치적 효과에 미치는 영향에 관한 이론적 쟁점과 실증연구를 분석함으로써 시민의 정치적 참여에 적합한 정치단위의 적정규모에 대해 모색하고자 한다. 특히 자연실험 상황을 이용한 실증연구들의 분석을 통해, 규모변화가 시민의 민주적 참여에 미친 인과 효과를 밝히고자 한다. 과거 정치 단위 규모에 관한 실증연구들은 연구모형 상 한계, 데이터의 한계, 선택된 데이터 시계열의 차이 등으로 인해 규모의 인과적 효과를 제대로 밝히지 못했다. 그러나 자연실험 상황은 동일한 정치단위의 인구 변화를 직접적으로 분석할 수 있기 때문에 규모의 효과를 제대로 포착할 수 있다. 이들 연구를 요약하면, 정치 단위 규모를 정당과 선거구 크기로 나누어 살펴보았을 때, 규모의 증가는 시민의 정치 행태에 악영향을 미치는 것으로 나타났다. 규모가 커질수록 투표율이 낮아졌으며, 시민들은 지역 정치에 관한 사항을 잘 알지 못했고, 정부가 자신의 요구를 더 잘 들어줄 것이란 믿음도 낮아졌다. 이러한 결과는 행정의 효율성 측면에서만 접근하였던 행정구역 통합 논의에 대한 신중한 접근이 필요함을 시사한다. This paper deals with question on the relations between polity size(population) and democratic political behavior by analyzing political theory issue and reviewing empirical research. What is the optimal polity size for political behavior? Many empirical studies on the effect of polity size are quiet limiting as they have several imperfection such as endogenous research design and difference in time-series data and different context. In particular, by introducing several research implemented under natural experiment situation, we try to identify the causal relation between two concepts. The evidence from these studies suggests that polity size has negative effect on political behavior. Further evidence suggests that this negative effect is the result of a tendency of citizens in small polity have more political efficacy and political trust with their local politics than residents in large units. This results implicate that it requires a more judicious approach to applying the administrative district consolidation which is mainly focused on efficiency value.