Abstract: According to an embodiment, a painless syringe for reducing noise and friction caused when perforating an alveolar bone comprises an injecting part having a needle for perforating the alveolar bone and injecting an anesthetic, a holder having a first end coupled with the injecting part and a second end open and empty, an ampoule formed to be inserted into the holder and having a first end into which the needle of the injecting part is inserted and a second end having a piston for discharging the anesthetic, a housing formed to receive the holder and having a through hole to expose the first end of the holder to an outside, and a handpiece coupled with the housing, rotating the ampoule, the holder, and the injecting part to perforate the alveolar bone, and pressing the piston to inject the anesthetic.

Abstract: According to an embodiment, a painless syringe with an anti-slip structure for perforating an alveolar bone and injecting an anesthetic comprises an injecting part having a needle for perforating the alveolar bone and injecting the anesthetic, a holder having a first end coupled with the injecting part and a second end open and empty, an ampoule formed to be inserted into the holder and having a first end into which the needle of the injecting part is inserted and a second end having a piston for discharging the anesthetic, a housing formed to receive the holder and having a through hole to expose the first end of the holder to an outside, and a handpiece coupled with the housing, rotating the ampoule, the holder, and the injecting part to perforate the alveolar bone, and pressing the piston to inject the anesthetic.

Abstract: An apparatus for transmitting packets by using a timer interrupt service routine is provided. When a task for transmitting a user datagram protocol (UDP) packet occurs while a central processing unit processes at least one task, the apparatus generates a timer interrupt event for each time set considering a packet transmission interval and calls a timer interrupt service routine, and transmits a UDP packet at equal intervals to a destination by using the timer interrupt service routine.

Abstract: Provided are a video encoding apparatus using a packet transmission order rearrangement that reduces loss of packets due to network congestion, by rearranging packets arranged in a Ai,j matrix, into a Bk matrix, via adjustment of a transmission order for each destination, based on the number of all packets for each destination, or by using an arrangement in a one-dimensional (1D) matrix and header points corresponding to the number of destinations, and an operation procedure of the video encoding apparatus.