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Software refactoring is to improve readability, maintainability and expansibility of software by adjusting its internal structure, whereas the external behaviors of software are not changed. Although software refactoring should not change the external behaviors of software systems, they might make a regression test case obsolete (with syntax and runtime errors) or fail. People have investigated which...
This paper reports the progress of binary Josephson system for precise ac waveform synthesis in National Institute of Metrology, China (NIM). We designed a 32-channel bias source for dynamic voltage synthesis up to 1 kHz with a programmable Josephson junction array. The latest design of output drive current has a rise-time less than 50 ns on 100 ohm resistant. The 32-channel bias source is able to...
A comparison between the National Institute of Metrology (NIM) and the Beijing Institute of Radio Metrology and Measurement (BIRMM) Programmable Josephson Voltage Standards (PJVS) at 1 V level was carried out at Changping campus of NIM from November 16 to November 17, 2009. The measured difference voltage between the two PJVS is 2×10-10 in direct comparison and 4×10-9 in indirect comparison. The results...
This paper presents a dual-channel timed array transmitter for impulse radio ultra wide band wireless communication system. The transmitter can generate UWB pulses in two separate transmitter paths with tunable path delay difference of 0˜250 ps to achieve beamforming capability. Through injection locking with 800 MHz input reference, the generated UWB pulse centers at 4 GHz and covers 3˜5 GHz band...
Fingerprint matching is the key component of Automated Fingerprint Identification System (AFIS). Not only the online and real-time fingerprint identification system, but also the fingerprint identity key and the challenge-response authentication based on biological feature, acquires fingerprint matching algorithm based on minutiae with high accuracy and robustness. This paper introduces a novel fingerprint...
Classical high resolution DOA estimation methods such as MUSIC (multiple signal classification), ML (maximum likelihood) and WSF (weighted subspace fitting) are replanted into conformal array antennas by modeling conical conformal manifold in this paper. The variance of these algorithms mentioned above and CRB (Cramer-Rao bound) are given. The performances and their relationship among these methods...
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