Traditional RFID-based access control systems use flap barriers to help manage pedestrian and block unauthorized staff at any entrance, which requires visitors swipe their cards individually wait for the opening of blocking body, resulting in low-frequency even congestion places with large passenger flow. This paper proposes a barrier-free system (RF-Access) UHF RFID technology. The main advant...

introduction: a limited number of studies have evaluated factors influencing the retention of fixed prostheses cemented to implant abutments. the aim of this study was to compare the effect of varying degrees of screw access channel obturation on retention of implant-supported cast fixed restorations. materials  & methods: in this experimental study, 40 implant abutments with a diameter of 4.5 ...

All new computers have multicore processors. To exploit this hardware parallelism for improved performance, the predominant approach today is multithreading using shared variables and locks. This approach has potential data races that can create a nondeterministic program. This paper presents a promising new approach to parallel programming that is both lock-free and deterministic. The standard...