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Choi, Jin H.,Kim, Hanseul,Lim, Ji-Hun,Kwon, Soon-Jong,Park, Eun Young,Lee, Kyu Tae The Electrochemical Society 2018 Journal of the Electrochemical Society Vol.165 No.16
<P>Ni-rich layered oxide cathode materials have been extensively investigated as a cathode material for lithium-ion batteries because of their higher reversible capacity and lower cost than lithium cobalt oxide. However, most of them have been examined using lab-scale coin cells, and consequently, there is a limit to fully understanding the failure mode of Ni-rich layered oxides in commercial high energy Li-ion batteries. In this paper, the pouch-type 20 Ah-scale Li-ion full cells are fabricated using Ni-rich layered oxides as a cathode and graphite as an anode. Then, the electrochemical performances and thermal behaviors of Ni-rich layered oxides are compared to investigate their failure mode in large-scale Li-ion cells. The cell skin temperature is measured to observe the thermal behavior of Ni-rich layered oxides. A strong correlation between capacity retention, cell temperature variation, and internal cell impedance is observed in Ni-rich layered oxides. Moreover, an increase in the internal cell impedance during cycling is attributed to interfacial degradation of Ni-rich layered oxides rather than their bulk structural deformation. Therefore, we need to focus on the interfacial stability of Ni-rich layered oxide materials to improve their electrochemical performance for large-scale Li-ion batteries.</P>
Validation of the Korean Version of the Psychosis Screener to Identify Patients With Psychosis
Hyunsuk Jeong,So Hee Lee,Seung-yup Lee,Jangrae Kim,Gyeongmin Kim,Hanseul Kwon,Anna Waterreus,Hyeon Woo Yim 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.8
Objective This study aimed to validate the Korean version of a short screening tool for psychosis as the first stage in finding undiagnosed psychosis in the community. Methods The sample contained 126 consecutive psychiatric outpatients in National Medical Center, Seoul, Korea, between July 20 and July 22, 2020. The Psychosis Screener (PS) comprises 7 items covering psychotic symptoms. The presence of each psychotic symptom was determined by a trained mental health professional and coded “yes” or “no.” Two psychiatrists reviewed the medical records independently and extracted the ICD-10-based diagnoses. Any differences between the two clinicians were resolved by consensus, and the agreed diagnosis was used as a gold standard in the study. Results Among 126 psychiatric outpatients who were enrolled in a consecutive manner during the study period, the proportion of psychosis was 15.1%. The PS showed 78.9% sensitivity and 72.0% specificity when the optimal cut-off was 2, indicating that a score of 2 or more on the screener identified a likely case of psychosis. The area under the curve for the PS was 0.78 (95% CI: 0.67-0.87). Conclusion The Korean version of the PS has an ability to discriminate between those who meet the diagnostic criteria for psychosis and those who do not in a high-prevalence group.