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Recent smart devices offer technologies that can measure indoor as well as outdoor locations. In the case of outdoor positioning, a global positioning system (GPS) is generally used. There is a limit to the method of using the GPS signal for indoor positioning. A typical indoor positioning method is to use a beacon based on bluetooth low energy (BLE). However, this method has disadvantages that needs...
We consider an inter-layer FEC technique combined with hierarchical 16QAM schemes for stereoscopic video transmission over AWGN relay channels. The proposed system with the suitable hierarchical value (α) can gain about 2.26–6.18 dB in the average PSNR performance, compared with the system using conventional FEC and hierarchical 16QAM schemes.
This paper describes an adaptive time-to-live (TTL) allocation scheme based on dynamic caching of content delivery network (CDN). This is advantageous in that when a client watches a real-time private broadcast, the load of the origin server can be efficiently reduced when a certain scene from the past is viewed again, and a storage space of a cache server can be efficiently used. Therefore, the adaptive...
Recently, interest in contents utilizing 360 and Virtual Reality images is increasing. These images are generally transformed into Equirectangular projection and transmitted in a 2:1 ratio rectangular shape. However, this method causes distortion of the upper and lower parts of the 360 images which is widely spread. Furthermore, since the spread 360 images requires higher data rate, it is difficult...
In this paper, a step-down converter for mobile LED applications is proposed. The converter which is operated with 4 MHz high switching frequency is capable of reducing mounting area of passive devices. It consists of a power stage and a control block. The power stage is composed of inductor, output capacitor, MOS transistors and feedback resistors, meanwhile, the control block consists of a pulse...
This paper presents design of the integrated chaotic neuron using 0.8 ??m single poly CMOS technology, its dynamical behavior analysis. Proposed chaotic neuron consists of several op-amps, sample and hold circuits, a nonlinear function block for chaotic signal generation, a two-phase clock circuits and sigmoid output function block. From HSPICE simulation results of the circuit, approximated empirical...
In this paper, we propose a new complementary image sensor pixel structure by improving the conventional 3TR pixel structure. Proposed complementary pixel structure for wide dynamic range CIS consists of photo diode, PMOS reset transistor, several PMOS and NMOS transistors for complementary signals. We show SPICE simulation results of the complementary image pixel structure for optimization. Proposed...
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