In order to testify and examine the ability and correctness of an expert system for diagnosing the faults in the electrical power system of a certain kind of satellite, the authors have developed a simulated testbed a...In order to testify and examine the ability and correctness of an expert system for diagnosing the faults in the electrical power system of a certain kind of satellite, the authors have developed a simulated testbed according to the operational principle of the electrical power system. This paper takes the solar battery array as an instance to introduce the designing principle of its hardware circuits, and presents the methods to design the interface and the software program of the single-chip microprocessor system. The software scheme of the upper computer is introduced at the end of this paper. It has been proved that this simulated system could effectively achieve the complete functions coupled with the simple design by using of various mature techniques in the fields of electronic circuits, single-chip microprocessor and numerical emulation.展开更多
This paper presents a modified multi-resolution telescopic search algorithm (MRTlcSA) for the block-matching motion estimation. A novel inverse telescopic search is substituted for the conventional telescopic search, ...This paper presents a modified multi-resolution telescopic search algorithm (MRTlcSA) for the block-matching motion estimation. A novel inverse telescopic search is substituted for the conventional telescopic search, that reduces the on-chip memory size and memory bandwidth for VLSI implementation. In addition, strategies of motion track and adaptive search window are applied to reduce the computational complexity of motion estimation. Simulation results show that, compared with the MRTleSA, the proposed algorithm reduces the computational load to only 30% while preserving almost the same image quality. Comparisons on hardware cost and power consumption of the VLSI implementations using the two algorithms are also presented in the paper.展开更多
A compact passively Q-switched Yb：YAG microchip laser is demonstrated. Featuring a semiconductor saturable-absorber mirror （SESAM）, the laser yields pulses of 219 ps when the length of the microchip Yb：YAG crystal...A compact passively Q-switched Yb：YAG microchip laser is demonstrated. Featuring a semiconductor saturable-absorber mirror （SESAM）, the laser yields pulses of 219 ps when the length of the microchip Yb：YAG crystal is 100 #m and the beam quality is M2 〈 1.3. To the best of our knowledge, pulses from the proposed laser are the shortest Q-switching pulses obtained from Yb：YAG microchip lasers currently available.展开更多
A 7-chip, 280 Gb/s optical code-division multiplexing （OCDM） system incorporating quaternary phase coding and decoding superstructured fiber Bragg gratings （SSFBGs） is experimentally demonstrated. Only ordinary ph...A 7-chip, 280 Gb/s optical code-division multiplexing （OCDM） system incorporating quaternary phase coding and decoding superstructured fiber Bragg gratings （SSFBGs） is experimentally demonstrated. Only ordinary phase masks and sub-micrometer precision are needed to fabricate the encoding and decoding SSFBGs. Interchannel interference noise is also considered and evaluated, 2-channel 40 （Gb/s）/channel （2 ×40 Gb/s） signal transmission is demonstrated.展开更多
A real-time two-dimensional （2D） triangulation range finder is presented, which is composed of two linear complementary metal oxidation semiconductor （CMOS） chips, two camera lenses, and four light emitting diodes...A real-time two-dimensional （2D） triangulation range finder is presented, which is composed of two linear complementary metal oxidation semiconductor （CMOS） chips, two camera lenses, and four light emitting diodes （LEDs）. The high order distortion in image aberrations is the main factor responsible for the coarse errors. The theoretical prediction is in good agreement with experiments and the correction equation is used to obtain more reliable results with the unique distortion coefficient in tile whole working region.展开更多
文摘In order to testify and examine the ability and correctness of an expert system for diagnosing the faults in the electrical power system of a certain kind of satellite, the authors have developed a simulated testbed according to the operational principle of the electrical power system. This paper takes the solar battery array as an instance to introduce the designing principle of its hardware circuits, and presents the methods to design the interface and the software program of the single-chip microprocessor system. The software scheme of the upper computer is introduced at the end of this paper. It has been proved that this simulated system could effectively achieve the complete functions coupled with the simple design by using of various mature techniques in the fields of electronic circuits, single-chip microprocessor and numerical emulation.
文摘This paper presents a modified multi-resolution telescopic search algorithm (MRTlcSA) for the block-matching motion estimation. A novel inverse telescopic search is substituted for the conventional telescopic search, that reduces the on-chip memory size and memory bandwidth for VLSI implementation. In addition, strategies of motion track and adaptive search window are applied to reduce the computational complexity of motion estimation. Simulation results show that, compared with the MRTleSA, the proposed algorithm reduces the computational load to only 30% while preserving almost the same image quality. Comparisons on hardware cost and power consumption of the VLSI implementations using the two algorithms are also presented in the paper.
文摘A compact passively Q-switched Yb：YAG microchip laser is demonstrated. Featuring a semiconductor saturable-absorber mirror （SESAM）, the laser yields pulses of 219 ps when the length of the microchip Yb：YAG crystal is 100 #m and the beam quality is M2 〈 1.3. To the best of our knowledge, pulses from the proposed laser are the shortest Q-switching pulses obtained from Yb：YAG microchip lasers currently available.
基金This work was supported by the state "863" High Technology Program of China under Grant No. 2002AA122035.
文摘A 7-chip, 280 Gb/s optical code-division multiplexing （OCDM） system incorporating quaternary phase coding and decoding superstructured fiber Bragg gratings （SSFBGs） is experimentally demonstrated. Only ordinary phase masks and sub-micrometer precision are needed to fabricate the encoding and decoding SSFBGs. Interchannel interference noise is also considered and evaluated, 2-channel 40 （Gb/s）/channel （2 ×40 Gb/s） signal transmission is demonstrated.
文摘A real-time two-dimensional （2D） triangulation range finder is presented, which is composed of two linear complementary metal oxidation semiconductor （CMOS） chips, two camera lenses, and four light emitting diodes （LEDs）. The high order distortion in image aberrations is the main factor responsible for the coarse errors. The theoretical prediction is in good agreement with experiments and the correction equation is used to obtain more reliable results with the unique distortion coefficient in tile whole working region.
