In this paper, we propose an active file mode change mechanism in which the synchronization system of cloud storage automatically changes files a directory client to online or local by considering tradeoff between usage and access time according activation ratio. When ratio rises above certain threshold, proposed selects based on delay them reduce IoT clients. falls below last increase availabl...

introduction: root canal preparation techniques may cause postoperative pain. the aim of the present study was to compare the intensity of postoperative pain after endodontic treatment using hand files, single file rotary (oneshape), and single file reciprocating (reciproc) systems. methods and materials: in this single-blind, parallel-grouped randomized clinical trial a total of 150 healthy pa...