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The present study analysed digital literacy issues encountered by elementary school teachers in remote classrooms due to COVID-19. The study sought to derive a plan for cultivating teachers’ digital literacy to support students’ distance education. To this end, focus group interviews were conducted with five elementary school teachers in charge of upper grades, the results were analysed, and strategies to improve teacher digital literacy were derived. Specifically, three main areas of teacher digital literacy were identified for improvement. The first was providing training to use digital devices and online platforms, develop online content, and strengthen copyright understanding. The second was providing professional development programs to train digital teaching methods or pedagogies by level and by subject characteristics. The third was activating online and offline platforms for information sharing among teachers and establish a digital teaching support system. This study will be of value to teachers and school administrations in preparing for distance education in the era of digital transformation because it presents measures to foster teachers’ digital literacy required by future society.

R134a, a vehicle refrigerant used in the vehicle heat pump system, is regulated according to the Montreal Protocol. Refrigerants such as R1234yf, R744, and R290 in vehicle heat pump systems are being investigated to identify their alternatives. Because developing a new system exclusively for new refrigerants is costly, an empirical test was conducted on the R1234yf refrigerant in a heat pump system designed for the R134a refrigerant in an actual vehicle system. The heating, cooling, and battery-cooling modes were tested for the amount of refrigerant charge, and operability tests were conducted for the compressor load; heating, ventilation, air conditioning (HVAC) air flow rate; coolant temperature; and flow rate of each mode. The optimal refrigerant charge in heating mode was 0.7 kg, and the optimal refrigerant charge in the cooling and battery-cooling modes was 0.9 kg. To yield the highest coefficient of performance of the system, the compressor load was 50%, the HVAC fan was 12 V, and the coolant flow rate was 10 LPM. The most efficient system operation was possible at a coolant temperature of 30 °C in the cooling and heating modes and at 20 °C in battery-cooling mode.

This case report describes a patient with post-neurosurgical infection and bacteremia caused by Klebsiella pneumoniae carbapenemase-producing Klebsiella pneumoniae. There is limited evidence to guide antibiotic treatment decisions for such infections. The patient was treated with meropenem-vaborbactam (MEV). MEV monotherapy was associated with bacteremia clearance.