Bis(methanol-κO)bis­(quinoline-2-carboxyl­ato-κ2 N,O)nickel(II)

In the title complex, [Ni(C10H6NO2)2(CH3OH)2], the NiII ion lies on an inversion center and is coordinated by two quinoline-2-carboxyl­ate ligands in the equatorial sites and two axial methanol ligands, forming a distorted octa­hedral environment. In the crystal, mol­ecules are linked via O—H⋯O hydrogen bonds into a two-dimensional network parallel to (10)

A New Approach for Reducing Virtual Reality Sickness in Real Time: Design and Validation Study

BackgroundRecently, technology that provides virtual reality (VR) content based on streaming services has been rapidly developed. However, there have been few studies to reduce VR sickness that occurs while the user watches VR content while wearing a head-mounted display (HMD) in real time. ObjectiveBased on this background, we propose a new approach to measure and reduce VR sickness that occurs while the user watches VR content while wearing an HMD in real time. MethodsThe proposed approach is to apply VR sickness reduction methods in accordance with the user’s real-time VR sickness level. Three methods that are known to be effective in reducing VR sickness and a single type of VR content were used to examine the effectiveness of the proposed approach, which was confirmed by the experimental results. ResultsOur results show that VR sickness significantly decreased when a new approach was applied to VR content (in all cases, P<.05). ConclusionsFrom our results, it was confirmed that VR sickness could be measured without wearing additional equipment, and its reduction method could be applied in real time in accordance with the user’s condition by the proposed approach in this paper

A Study On The Effective Education In Metaverse Platform: Case Of South Korea

Recently, many countries are starting social distancing or lockdown measures in order to control the pandemic caused by COVID-19. At the same time, more and more attempts are made to solve the problem of education break through the NFF education using teleconferencing platforms. However, in NFF education, there exists problems which have difficulty in recognizing nonverbal communication and giving feedback. Virtual Reality (VR) based NFF education has been presented to solve this problem, thus which has the various Metaverse platform (led to VR Class using). However, research for VR-based NFF education is insufficient. Therefore, in this paper, we propose a method for VR-based NFF education. For this purpose, a survey was conducted with students and teachers who took or conducted NFF education or VR-based NFF education in South Korea. Based on the survey results, we proposed the essential elements for VR-based NFF education and methods to achieve them

Effectiveness of a Participatory Program for Improving the Cardiovascular and Cerebrovascular Health of Older Farmers in Rural Korea

Background: The aim of this study was to evaluate the effectiveness of a participatory approach to the cardiovascular and cerebrovascular (CCV) health of older farmers in rural Korea. Methods: A nonequivalent control group pretest–posttest design was used. Participants included 58 farmers aged ≥ 60 years who were assigned to either an experimental group (n = 28) or a comparative group (n = 30). The experimental group took part in the participatory program for CCV health, while the comparative group received a conventional lecture program for CCV health. The two groups, from pretest to posttest, were compared using the generalized estimating equation (GEE) method. Results: The participatory program showed a greater effect over time than the conventional lecture program for health empowerment (Χ2 = 7.92, p = 0.005) and self-efficacy in managing CCV health (Χ2 = 5.94, p = 0.015). The average rate of implemented improvements after 3 months was 88.9%, showing that the participatory program was successful. Conclusions: The participatory program for CCV health was an effective intervention for the empowerment and self-efficacy of older farmers in managing their own CCV health. Therefore, we recommend replacing lectures with participatory methods in CCV health programs for older farmers

Effects of Cybersickness Caused by Head-Mounted Display–Based Virtual Reality on Physiological Responses: Cross-sectional Study

BackgroundAlthough more people are experiencing cybersickness due to the popularization of virtual reality (VR), no official standard for the cause and reduction of cybersickness exists to date. One of the main reasons is that an objective method to assess cybersickness has not been established. To resolve this, research on evaluating cybersickness with physiological responses that can be measured in real time is required. Since research on deriving physiological responses that can assess cybersickness is at an early stage, further studies examining various physiological responses are needed. ObjectiveThis study analyzed the effects of cybersickness caused by head-mounted display–based VR on physiological responses. MethodsWe developed content that provided users with a first-person view of an aircraft that moved (with translation and combined rotation) over a city via a predetermined trajectory. In the experiment, cybersickness and the physiological responses of participants were measured. Cybersickness was assessed by the Simulator Sickness Questionnaire (SSQ). The measured physiological responses were heart rate, blood pressure, body temperature, and cortisol level. ResultsOur measurement confirmed that all SSQ scores increased significantly (all Ps<.05) when participants experienced cybersickness. Heart rate and cortisol level increased significantly (P=.01 and P=.001, respectively). Body temperature also increased, but there was no statistically significant difference (P=.02). Systolic blood pressure and diastolic blood pressure decreased significantly (P=.001). ConclusionsBased on the results of our analysis, the following conclusions were drawn: (1) cybersickness causes significant disorientation, and research on this topic should focus on factors that affect disorientation; and (2) the physiological responses that are suitable for measuring cybersickness are heart rate and cortisol level

The complete chloroplast genome sequence of three medicinal species; Curcuma longa, Curcuma wenyujin, and Curcuma phaeocaulis (Zingiberaceae)

Curcuma longa, C. wenyujin and C. phaeocaulis are important herbal medicine which of rhizomatous herbaceous perennial plant of the family Zingiberaceae. This study generated a complete chloroplast genome sequence of three medicinal species were characterized by de novo assembly with whole genome sequencing data. The length of complete chloroplast genome were 162,180 bp (C. longa), 162,266 bp (C. wenyujin), and 162,133 bp (C. phaeocaulis), respectively, with four structures that were included in large single copy region (87,001 bp, 87,042 bp, and 87,013 bp), small single copy region (15,681 bp, 15,710 bp, and 15,622 bp), and duplicated inverted regions (29,749 bp, 29,757 bp and 29,749 bp of each). Based on phylogenetic trees, C. longa, C. wenyujin, and C. phaeocaulis were grouped by high bootstrap value with Curcuma species. This result approved that C. longa, C. wenyujin and C. phaeocaulis were comprised in Alpinia and Wurfbainia. Therefore, this chloroplast genome data firstly generated valuable genetic resource in discrimination of herbal materials, phylogeny and development DNA marker