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Hong Jihoon,Park C. Hyung Keun,Kim Harin,Hong Youjin,Ahn Junseok,Jun Jin Yong,Park Jangho,Kim Jeong Hye,Bang Young Rong,Chung Seockhoon 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.4
Objective We aimed to explore whether nursing professionals’ psychological states affect their grief response for a patient’s death in the coronavirus disease-2019 (COVID-19) inpatients’ ward.Methods Survey was conducted among frontline nursing professionals working in COVID-19 inpatients wards at three tertiary-level affiliated hospitals of the University of Ulsan during April 7–26, 2022. Participants’ information such as age, years of employment, or marital status were collected, and their responses to rating scales including Pandemic Grief Scale (PGS) for healthcare workers, Stress and Anxiety to Viral Epidemics-9 items (SAVE-9), Patient Health Questionnaire-9 (PHQ-9), Loneliness and Social Isolation Scale, and Insomnia Severity Scale (ISI) were collected.Results All 251 responses were analyzed. We observed that 34% reportedly suffered from depression. The linear regression analysis showed that a high PGS score was expected by high SAVE-9 (β=0.12, p=0.040), high PHQ-9 (β=0.25, p<0.001), high loneliness (β=0.17, p=0.006), and high ISI score (β=0.16, p=0.006, F=20.05, p<0.001). The mediation analysis showed that the depression of nursing professionals directly influenced their pandemic grief reaction, and their work-related stress and viral anxiety, insomnia severity, and loneliness partially mediated the association.Conclusion We confirm that frontline nursing professionals’ depression directly influenced their grief reaction, and their work-related stress and viral anxiety, insomnia severity, and loneliness partially mediated the association. We hope to establish a psychological and social support system for the mental health of nurses working in the COVID-19 wards.
Remote homoepitaxy of ZnO microrods across graphene layers
Jeong, Junseok,Min, Kyung-Ah,Shin, Dong Hoon,Yang, Woo Seok,Yoo, Jinkyoung,Lee, Sang Wook,Hong, Suklyun,Hong, Young Joon The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.48
<P>Two-dimensional atomic layered materials (2d-ALMs) are emerging candidates for use as epitaxial seed substrates for transferrable epilayers. However, the micrometer-sized domains of 2d-ALMs preclude their practical use in epitaxy because they cause crystallographically in-plane disordering of the overlayer. Ultrathin graphene can penetrate the electric dipole momentum from an underlying crystal layer to the graphene surface, which then drives it to crystallize the overlayer during the initial growth stage, thus resulting in substantial energy saving. This study demonstrates the remote homoepitaxy of ZnO microrods (MRs) on ZnO substrates across graphene layers <I>via</I> a hydrothermal method. Despite the presence of poly-domain graphene in between the ZnO substrate and ZnO MRs, the MRs were epitaxially grown on <I>a</I>- and <I>c</I>-plane ZnO substrates, whose in-plane alignments were homogeneous within the wafer's size. Transmission electron microscopy revealed a homoepitaxial relationship between the overlayer MRs and the substrate. Density-functional theory calculations suggested that the charge redistribution occurring near graphene induces the electric dipole formation, so the attracted adatoms led to the formation of the remote homoepitaxial overlayer. Due to a strong potential field caused by long-range charge transfer given from the substrate, even the use of bi-layer and tri-layer graphene resulted in remote homoepitaxial ZnO MRs. The effects of substrate crystal planes were also theoretically and empirically investigated. The ability of graphene, which can be released from the mother substrate without covalent bonds, was utilized to transfer the overlayer MR arrays. This method opens a way for producing well aligned, transferrable epitaxial nano/microstructure arrays while regenerating the substrate for cost-saving device manufacturing.</P>
Concept Design of a Novel Bio-Inspired Drilling System for Shallow Drilling
Junseok Lee,Christian Tirtawardhana,Heung Woon Jang,Jung-Wuk Hong,Hyun Myung 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
As the exhaustion of resources used as existing energy such as petroleum and coal are approaching, interest in planning and research for finding new energy sources is on the rise. In addition, the use of existing energy sources is one of the main causes of environmental destruction. Energy demand is steadily increasing, and it is urgently needed to find alternative energy sources due to exhaustion and limitation of existing energy sources. The use of drilling technology is inevitable for exploring these new energy sources. However, existing drilling equipment and technologies have limitations due to the colossal size and complicated processes, and also cause environmental damage resulting from drilling wide area. Therefore, in this paper, to overcome these limitations, the mechanism of a compact excavating robot that mimics the anatomy and habit of digging animals is proposed. The proposed bio-inspired mechanism simulates the excavating and debris removing process of a ground-digging mole using its teeth and forelimbs. Finally, the stress generated by the module during excavation is analyzed and the design durability is verified through the simulation.