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Guangzhou, China

Wu J.,Vocational College | Zhang H.,University of Alberta | Guan Y.,Guangdong University of Technology
Proceedings of the World Congress on Intelligent Control and Automation (WCICA) | Year: 2015

In this paper, we present a novel approach for visual loop-closure detection in autonomous robot navigation. Our method uses locality sensitive hashing (LSH) as the basic technique for matching the binary visual features in the current view of a robot with the visual features in the robot appearance map. We show that this approach is highly efficient in comparison with using non-binary visual features such as SIFT and that it is more accurate than the popular bag-of-words (BoW) approach for generating loop closure candidates. Our experiment was conducted with an indoor dataset. © 2014 IEEE.

Wang Z.-L.,First Institute of Oceanography | Qu N.,Vocational College | Dai F.-F.,U.S. Center for Disease Control and Prevention
Chinese Journal of Applied Ecology | Year: 2010

A total of eighteen common phytoplankton species in China coastal waters were divided into different assemblages to investigate the increasing pattern of the assemblage biomass with species richness. The sampling effect was studied by multiple analysis of variance (MANOVA) method , and the complementary effect was explored by over-yielding analysis, relative yield total ( RYT) index, and subset approach. It was shown that the increasing pattern of assemblage biomass with species richness was not unitary. When the species number was lower than 5, the assemblage biomass increased with increasing species richness; when the species number was higher than 5, there wrere no obvious relationships between assemblage biomass and species richness. A stronger complementary effect was observed inside the assemblage, presenting a hump-shaped variation with increasing species richness. The sampling effect of the assemblages occurred at stable growth phase.

Yin C.,Shandong Water Polytechnic | Li Y.,Vocational College | Zhang D.,China Mobile | Cheng Y.,Rizhao Radio and University
Proceedings - 2nd IEEE International Conference on Advanced Computer Control, ICACC 2010 | Year: 2010

In this paper we present DSMAC-an energy efficient medium access control (MAC) protocol in wireless sensor networks which are widely used for long-time monitoring. Our protocol is designed for event-driven and ultra-low power sensor networks. Using dynamic sleep scheme to save energy is one of the key problems in this kind of system. The basic idea is that, when an event is apperceived by sensors, all nodes in the network use a value of grads to earmark the location of an event, which is used for data searching expediently, and all nodes adjust their sleep periods dynamically due to their grads. Simulations show that, our MAC protocol for event-driven wireless sensor networks shows higher efficiency than exists approaches and is more suitable for long-time monitoring. ©2010 IEEE.

Liang J.-H.,Vocational College
Wool Textile Journal | Year: 2010

The resources of orange peels are abundant but are underutilized. This paper makes the basic experiments on abstraction and spectrometric determination for pigments from orange peels and determines the optimal extractants to be absolute ethanol and distilled water based on the changes of color concentrations and chromatic light. The longest absorption wavelength of pigments from orange peels is 400 nm. The paper adopts the direct and mordant methods to study the dyeing of pigments from orange peel for silk fibers and makes the determination and analysis for the dye uptake rate and color fastness. The optimal dyeing processes of direct and mordant methods are that stock solution of pigments is used in the direct method with the liquor ratio of 1:50, pH value 6, 90 °C, 60 min, The conclusion which can be drawn with the aluminum and iron dyeing mordants is that the concentration of aluminum dyeing mordant is 6% (owf), the concentration of aluminum dyeing mordant is 4% ( owf ) and the temperature is 60 °C and the fastness of the dyed fabrics is satisfactory to some extent.

Zhang X.,Southwest University | Zhang X.,Vocational College | Zeng J.,Jingguangshan University | Chen J.,Southwest University | And 2 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2012

Bryophytes are a class of pioneer plants at desert vegetation succession and even in extremely dry environments. In this study, a theoretical foundation for the interest of recovering and administering the environments of rock- desertification ecology was provided by compared with the adaptability to habitat heterogeneity in rocky desertification environments among Erythrodontium julaceum, Barbula fallax and Bryum argenteum. The results show that, firstly, E. julaceum and B. fallax are more than B. argenteum in the capacity of holding maximal water and also in the rate of preserving natural water. Secondly, the water-uptaking processes of the three mosses are outer water uptake and inner water uptake. Although the three species had the same dynamic curve of the S type saturated water content, they had considerably different dynamic properties. Little difference was found in the amount of water saturated by E. julaceum and B. fallax. However, the amount of saturated water in E. julaceum and B. fallax were about 2. 5 times of that in the silver B. Argenteum. The amount of saturated water and the maximal rates of water uptake, inner as well as outer water uptake in E. julaceum were 3. 41, 2. 52 and 3. 02 times than those of B. argenteum, respectively. Similar results were also found in B. fallax. Furthermore, the stem cross-section structure of three mosses showed that B. argenteum and B. fallax had the obvious conducting strand and belonged to endohydric mosses. In contrast, E. julaceum owned no conducting strand and belonged to the part of the ectohydric. Strictly, the structure of endohydric and ectohydric in mosses is not the decisive factor of water absorption capability, which has close relationship with many aspects including growth form, type of capillary system and microstructure of stem and leaf positive correlations.

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