A novel reversible data hiding scheme with two-dimensional histogram shifting mechanism

Multimedia Tools and Applications - In this paper, we propose a novel reversible data hiding technique based on two-dimensional histogram shifting for quantized discrete cosine transformation...     

An Efficient Carrier-Based Modulation Strategy for Five-Leg Indirect Matrix Converters to Drive Open-End Loads with Zero Common-Mode Voltage

Abstract

This paper presents an efficient carrier-based modulation (CBM) strategy for a five-leg indirect matrix converter (IMC) to drive a three-phase open-end load (OEL) with approximate zero common-mode voltage (CMV) across the load phase. The operating principle of the five-leg IMC fed three-phase OEL is firstly analyzed to select suitable switching states that do not generate any CMV across the load phase. Then, the CBM strategy is developed to control the five-leg IMC in order to overcome the complexity of conventional space vector modulation strategies. Consequently, the gating signals are generated by the comparison of a high-frequency carrier signal with corresponding modulation signals without the computational burden and lookup-table technique. Also, the scheme of five-leg IMC fed OEL can decrease the numbers of power switches as well as acquire advanced features such as higher voltage transfer ratio and better output voltage quality with the three-level waveform. Simulation and experimental results are provided to validate the proposed CBM strategy.     

Measurements and empirical modeling of pure CO(2) absorption in the 2.3-νm region at room temperature: far wings, allowed and collision-induced bands

Measurements of pure CO(2) absorption in the 2.3-μm region are presented. The 3800-4700-cm(-1) range has been investigated at room temperature for pressures in the 10-50-atm range by using long optical paths. Phenomena that contribute to absorption are listed and analyzed, including the contribution of far line wings as well as those of the central region of both allowed and collision-induced absorption bands. The presence of simultaneous transitions is also discussed. Simple and practical approaches are proposed for the modeling of absorption, which include a line-shape correction factor χ that extends to approximately 600 cm(-1) from line centers.