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Kim, Johanna Inyang,Yun, Je-Yeon,Park, Heyeon,Park, Suk-Young,Ahn, Youngsheen,Lee, Hansol,Kim, Tae-Kwon,Yoon, Sooran,Lee, Young-Joon,Oh, Sohee,Denninger, John W,Kim, Bung-Nyun,Kim, Jeong-Hyun JMIR Publications 2018 Journal of medical Internet research Vol.20 No.10
<P><B>Background</B></P><P>Videoconferencing-based treatments have shown great potential in increasing engagement and compliance by decreasing the barriers of time and distance. In general, employees tend to experience a lot of stress, but find it difficult to visit a clinic during office hours.</P><P><B>Objective</B></P><P>The purpose of this study was to investigate the effectiveness of a mobile videoconference-based intervention for stress reduction and resilience enhancement in employees.</P><P><B>Methods</B></P><P>In total, 81 participants were randomly allocated to one of the three conditions: mobile videoconferencing, in-person, and self-care; of these, 72 completed the study. All participants underwent assessment via self-reported questionnaires before, immediately after, and 1 month after the intervention. Intervention lasted for 4 weeks and consisted of elements of cognitive behavioral therapy, positive psychology, and meditation. Changes in clinical variables regarding stress and resilience across time were compared between treatment conditions.</P><P><B>Results</B></P><P>There were significant condition × time effects on variables measuring perceived stress, resilience, emotional labor, and sleep, demonstrating significantly differential effects across time according to treatment condition. Moreover, there were significant effects of condition on perceived stress and occupational stress. There were no significant differences in any variable between the mobile videoconferencing and in-person conditions at 1 month after the intervention.</P><P><B>Conclusions</B></P><P>Results indicate that both mobile videoconferencing and in-person interventions were comparably effective in decreasing stress and enhancing resilience. Further studies with a larger sample size and a longer follow-up period are warranted to investigate the long-term effect of mobile videoconferencing interventions.</P><P><B>Trial Registration</B></P><P>ClinicalTrials.gov identifier NCT03256682; https://clinicaltrials.gov/ct2/show/NCT03256682 (Archived by WebCite at http://www.webcitation.org/71W77bwnR)</P>
Ion Pump Design for Improved Pumping Speed at Low Pressure
Paolini, Chiara,Audi, Mauro,Denning, Mark The Korean Vacuum Society 2016 Applied Science and Convergence Technology Vol.25 No.6
Even if ion pumps are widely and mostly used in ultra-high vacuum (UHV) conditions, virtually every existing ion pump has its maximum pumping speed around 1E-6 mbar (1E-4 Pa). Discharge intensity in the ion pump Penning cell is defined as the current divided by pressure (I/P). This quantity reflects the rate of cathode bombardment by ions, which underlies all of the various pumping mechanisms that occur in ion pumps (chemisorption on sputtered material, ion burial, etc.), and therefore is an indication of pumping speed. A study has been performed to evaluate the influence of magnetic fields and cell dimensions on the ion pump discharge intensity and consequently on the pumping speed at different pressures. As a result, a combination of parameters has been developed in order to design and build an ion pump with the pumping speed peak shifted towards lower pressures. Experimental results with several different test set-ups are presented and a prototype of a new 200 l/s ion pump with the maximum pumping speed in the 1E-8 mbar (1E-6 Pa) is described. A model of the system has also been developed to provide a framework for understanding the experimental observations.
Seismic Assessment and Performance of Nonstructural Components Affected by Structural Modeling
Jieun Hur,Eric Althoff,Halil Sezen,Richard Denning,Tunc Aldemir 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.2
Seismic probabilistic risk assessment (SPRA) requires a large number of simulations toevaluate the seismic vulnerability of structural and nonstructural components in nuclearpower plants. The effect of structural modeling and analysis assumptions on dynamicanalysis of 3D and simplified 2D stick models of auxiliary buildings and the attachednonstructural components is investigated. Dynamic characteristics and seismic performanceof building models are also evaluated, as well as the computational accuracy of themodels. The presented results provide a better understanding of the dynamic behavior andseismic performance of auxiliary buildings. The results also help to quantify the impact ofuncertainties associated with modeling and analysis of simplified numerical models ofstructural and nonstructural components subjected to seismic shaking on the predictedseismic failure probabilities of these systems.
Ion Pump Design for Improved Pumping Speed at Low Pressure
Chiara Paolini,Mauro Audi,Mark Denning 한국진공학회 2016 Applied Science and Convergence Technology Vol.25 No.6
Even if ion pumps are widely and mostly used in ultra-high vacuum (UHV) conditions, virtually every existing ion pump has its maximum pumping speed around 1E-6 mbar (1E-4 Pa). Discharge intensity in the ion pump Penning cell is defined as the current divided by pressure . This quantity reflects the rate of cathode bombardment by ions, which underlies all of the various pumping mechanisms that occur in ion pumps (chemisorption on sputtered material, ion burial, etc.), and therefore is an indication of pumping speed. A study has been performed to evaluate the influence of magnetic fields and cell dimensions on the ion pump discharge intensity and consequently on the pumping speed at different pressures. As a result, a combination of parameters has been developed in order to design and build an ion pump with the pumping speed peak shifted towards lower pressures. Experimental results with several different test set-ups are presented and a prototype of a new 200 l/s ion pump with the maximum pumping speed in the 1E-8 mbar (1E-6 Pa) is described. A model of the system has also been developed to provide a framework for understanding the experimental observations.