Yongjie Zhan

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Previous work on fire detection has focused on hand-designed features or carefully designed detectors. However, there are no universal hand-designed features or detectors that work well for various classification tasks or even for various fire detection scenarios. In this paper we propose a new method of video-based fire detection by learning multi-layer(More)
Bag Of computational verbs (BoCV) is a new framework based on computational verb theory. In this framework, verb similarities are summed up or averaged. The value of result is put into a bag as an entry for description in order that many verbs similarities can make up the final feature vector implicitly. A novel model called spatiotemporal verb bag (SVB) is(More)
Computational verb cellular networks (CVCNs) are cellular networks, of which the local rules are computational verb rules. Many patterns had been found in CVCN previously. In this paper, newly-discovered one-, two-, three- and four-armed spiral waves in CVCNs are presented. Eight-armed spiral waves appear briefly co-existing with four-armed patterns at a(More)
Correction In the original version of this article [1], the sizes of the simulated graphene models with different aspect ratios were not listed. Here, we add Table one (Table 1 here) to illustrate the sizes of rectangular graphene films simulated in the article [1]. In addition, there is a typo in the Acknowledgements section of the origin version of this(More)
A molecular dynamics study on nanoindentation experiments is carried out for some single-layer rectangular graphene films with four edges clamped. Typical load-displacement curves are obtained, and the effects of various factors including indenter radii, loading speeds, and aspect ratios of the graphene film on the simulation results are discussed. A(More)
Recently helical nanostructures such as nanosprings and nanocoils have drawn great interests in nanotechnology, due to their unique morphologies and physical properties, and they may be potential building blocks in sorts of electromechanical, magnetic, photoelectronic and plasmonic devices at micro/nanoscales. In this report, multi-turns copper nanocoils(More)
Some molecular dynamics simulations focusing on the interactions between graphene films and water droplets are carried out in this article to investigate the fluid-solid interfacial behavior of surface wettability. The wettability of an ideal graphene film is investigated at room temperature at the beginning of the simulations, then the influences of(More)
This paper proposes a new video-based method for fire detection, which uses color, spatial and temporal information. Our method divides videos into spatio-temporal blocks and extracts a novel volume SURF features from three orthogonal planes of these blocks. Combining spatio-temporal SURF features and the global color histogram of Lab color space on blocks,(More)
MoO2 is used as a new source material for the growth of large area and high optical quality monolayer MoS2. However, a systematic study of the growth parameters is still missing and large-area growth of discreet single crystals is still challenging. Hereby, we report the shape evolution of monolayer growth of MoS2 and develop a methodology to achieve(More)