With the development of general-purpose processors (GPP) and video signal processing algorithms, it is possible to implement a software-based real-time video encoder on GPP, and its low cost and easy upgrade attract d...With the development of general-purpose processors (GPP) and video signal processing algorithms, it is possible to implement a software-based real-time video encoder on GPP, and its low cost and easy upgrade attract developers' interests to transfer video encoding from specialized hardware to more flexible software. In this paper, the encoding structure is set up first to support complexity scalability; then a lot of high performance algorithms are used on the key time-consuming modules in coding process; finally, at programming level, processor characteristics are considered to improve data access efficiency and processing parallelism. Other programming methods such as lookup table are adopted to reduce the computational complexity. Simulation results showed that these ideas could not only improve the global performance of video coding, but also provide great flexibility in complexity regulation.展开更多
Eu2+-activated strontium choloro-phosphate has been used for lamp phosphor traditionally with high efficiency. In this paper, the cathodoluminescent properties of Sr5(PO4)3Cl:Eu2+ have been investigated for applicatio...Eu2+-activated strontium choloro-phosphate has been used for lamp phosphor traditionally with high efficiency. In this paper, the cathodoluminescent properties of Sr5(PO4)3Cl:Eu2+ have been investigated for application in field emission display. The influence of Ba2+, Ca2+ impurities on the cathodoluminescent spectrum of Sr5(PO4)3Cl:Eu2+ has also been measured. When operate voltage varied from mid- to low-voltage, the relative brightness and saturation behavior of phosphor was observed at different current density.展开更多
A kind of filed-emission array pressure sensor is designed based on the quantum tunnel effect. The nano-crystalline silicon film is prepared by chemical vapor deposition (CVD) method, with the grain dimension and thic...A kind of filed-emission array pressure sensor is designed based on the quantum tunnel effect. The nano-crystalline silicon film is prepared by chemical vapor deposition (CVD) method, with the grain dimension and thickness of the film 3—9 nm and 30—40 nm, respectively. The nano-crystal- line silicon film is introduced into the cathode cones of the sensor, functioning as the essential emission part. The silicon nano phase is analyzed by HREM and TED, the microstructure of the single emitter and emitters array is inspected by SEM, and the field emission characteristics of the device are studied by an HP4145B transistor tester. The experimental results show that the measured current density emitted from the effective area of the sensor can reach 53.5 A/m2 when the exterior electric field is 5.6×105 V/m.展开更多
文摘With the development of general-purpose processors (GPP) and video signal processing algorithms, it is possible to implement a software-based real-time video encoder on GPP, and its low cost and easy upgrade attract developers' interests to transfer video encoding from specialized hardware to more flexible software. In this paper, the encoding structure is set up first to support complexity scalability; then a lot of high performance algorithms are used on the key time-consuming modules in coding process; finally, at programming level, processor characteristics are considered to improve data access efficiency and processing parallelism. Other programming methods such as lookup table are adopted to reduce the computational complexity. Simulation results showed that these ideas could not only improve the global performance of video coding, but also provide great flexibility in complexity regulation.
基金supported by the Key Discipline of Education Committee of Tianjin City,the Foundation of Natural Science of Tianjin City and Education Committee of Tianjin City.
文摘Eu2+-activated strontium choloro-phosphate has been used for lamp phosphor traditionally with high efficiency. In this paper, the cathodoluminescent properties of Sr5(PO4)3Cl:Eu2+ have been investigated for application in field emission display. The influence of Ba2+, Ca2+ impurities on the cathodoluminescent spectrum of Sr5(PO4)3Cl:Eu2+ has also been measured. When operate voltage varied from mid- to low-voltage, the relative brightness and saturation behavior of phosphor was observed at different current density.
文摘A kind of filed-emission array pressure sensor is designed based on the quantum tunnel effect. The nano-crystalline silicon film is prepared by chemical vapor deposition (CVD) method, with the grain dimension and thickness of the film 3—9 nm and 30—40 nm, respectively. The nano-crystal- line silicon film is introduced into the cathode cones of the sensor, functioning as the essential emission part. The silicon nano phase is analyzed by HREM and TED, the microstructure of the single emitter and emitters array is inspected by SEM, and the field emission characteristics of the device are studied by an HP4145B transistor tester. The experimental results show that the measured current density emitted from the effective area of the sensor can reach 53.5 A/m2 when the exterior electric field is 5.6×105 V/m.
