Yunnan Land and Resources Vocational College

Kunming, China

Yunnan Land and Resources Vocational College

Kunming, China
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Yin X.,Beijing Jiaotong University | Cui Q.,Yunnan Land and Resources Vocational College | Wen Y.,Dalian Maritime University | Xiao Y.,Beijing Normal University | Song Y.,Beijing Jiaotong University
International Journal of Systems, Control and Communications | Year: 2011

Networked control system (NCS) is a distributed system in which the communication between sensor, actuator and controller occurs over a shared digital network. NCS can be treated as a hybrid system and in the past few years we have witnessed significant progress on using hybrid control theory for NCS. In this survey, we review the typical applications of hybrid control in NCS in the three aspects: 1 modelling and control associated with switched systems, asynchronous dynamical systems, and mixed logical dynamic systems 2 scheduling design focused on hybrid switch method 3 hybrid control theory to analyse the stability of NCS. As the conclusion of this paper, we also offer our view on the future research direction of this technically important area. © 2011 Inderscience Enterprises Ltd.

Cui Q.,Yunnan Land and Resources Vocational College | Ning J.,Yunnan Agricultural University | Yin X.,Beijing Jiaotong University
Chinese Control Conference, CCC | Year: 2014

Networked Control technology is the research focus, and it's significant and valuable to research the NCS technology applied in the building automation system. In the paper, the network data transmission of building automation system (BAS) is analyzed with the scheduling algorithm. According to the suitable scheduling algorithm, the priority of data guarantees the stability of the building automation system. Finally, according to the Truetime toolbox simulation, the application availability of scheduling algorithms is proved in building automation and control system network. © 2014 TCCT, CAA.

Yu L.,Yunnan Land and Resources Vocational College | Chen J.,Yunnan Land and Resources Vocational College
IET Conference Publications | Year: 2014

A debris flow is a common geological hazard which brings loss of tremendous life property. Whether it will occur depends on many impact factors. Hazard assessment of debris flow aims to decide the hazard level of debris flow by analysing some impact factors. It is a critical step for forecasting the occurrence of debris flow disaster. In this paper, we propose a novel method, employing rough sets and Dempster-Shafer theory, to analyse the impact factors of debris flows. We first detailed the procedure, and then the samples of 37 debris flow gullies in Yunnan were utilized to evaluate the method. The result suggests that the method is effective and reliable.

Feng S.,Kunming University of Science and Technology | Feng S.,CAS National Astronomical Observatories | Yu L.,Yunnan Land and Resources Vocational College | Yang Y.,Kunming University of Science and Technology
Bulletin of the Astronomical Society of India | Year: 2013

We investigate the phase relationship between grouped solar flares (GSFs) and sunspot numbers (SNs) during the time interval from 1965 January to 2008 June. It is found that, (1) from a global point of view, GSFs lead SNs in phase during solar cycles 20, 22 & 23, while the former lags behind the latter in solar cycle 21; (2) the phase relationship between them is not only time-dependent but also frequency dependent. This implies that their relationship is a complex nonlinear relationship, although they are highly correlated with each other. © 2013, Astronomical Society of India, Indian Institute of Astrophysics. All rights reserved.

Shen J.,Yunnan Land and Resources Vocational College | Zhang H.,Yunnan Land and Resources Vocational College | Ma Y.,Yunnan Land and Resources Vocational College
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Rice-planted area and production monitoring has significance for governments to formulate some food related policy. Remote sensing has an obvious advantage for the rice monitoring. As for the rice-planted area, the special growth raw shows different feature in the remote sensing image. In this paper, the multioral Landsat-8 OLI image of Menghun and Mengzhe town in Xishuangbanna autonomous prefecture where planting a large number of rice was used as the test data, the corresponding changes of the difference between NDVI and NDWI was used as the diagnostic feature, and the SAM classification approach was introduced to extract rice-planted area. The experiments shows that the approach could acquire more than 95% of the extraction accuracy. © 2015 SPIE.

Zhang H.-R.,Chinese Academy of Geological Sciences | Yang T.-N.,Chinese Academy of Geological Sciences | Hou Z.-Q.,Chinese Academy of Geological Sciences | Song Y.-C.,Chinese Academy of Geological Sciences | And 3 more authors.
International Geology Review | Year: 2013

The Palaeo-Tethyan tectonic evolution of central Tibet remains a topic of controversy. Two Permian to Late Triassic arc-like volcanic suites have been identified in the eastern Qiangtang (EQ) block of north-central Tibet. Three competing models have been proposed to explain the formation of these volcanic suites, with two models involving a single stage of long-lived subduction but with opposing subduction polarities, while the other model involves a two-stage subduction process. Here, we present new whole-rock geochemistry, including Sr-Nd isotope data, for late Permian felsic volcanics of the Zaduo area. These volcanics are mainly low to middle K calc-alkaline felsic tuffs and rhyolites with SiO2 concentrations up to 73 wt.%. In primitive mantle-normalized diagrams, the volcanics are typified by large ion lithophile element enrichment and high-field-strength element (e.g. Nb, Ta, P, and Ti) depletion, with slightly negative Eu anomalies. They have initial Sr ratios (87Sr/86Sr)i of 0.70319-0.70547, and εNd(t) values of +3.4 to +3.5, suggesting derivation by the partial melting of a depleted mantle wedge, followed by assimilation of crustal material. The available geochemical data indicate the presence of two distinctive igneous evolution trends within the Permian to Late Triassic volcanics of the EQ block, consistent with a two-stage subduction model. Permian to Early Triassic arc-like volcanics are formed during northward (present-day orientation) subduction, whereas the Late Triassic volcanics are related to southward (present-day orientation) subduction of mafic crust of the Garze-Litang Ocean. © 2013 Copyright Taylor and Francis Group, LLC.

Ren Y.,Yunnan Land and Resources Vocational College | Peng D.,Yunnan Land and Resources Vocational College | Wu J.,Tsinghua University | Zhou Y.,Yunnan Land and Resources Vocational College
Advances in Intelligent Systems and Computing | Year: 2014

Traffic data is the basis of Intelligent Transportation Systems (ITS). It is the key problem that how to fuse and share multi-resource heterogeneous data to provide comprehensive traffic information for ITS. This paper takes the Dynamic Traffic Routing System of Nanning City of China as example, multi-resource heterogeneous data fusion model is proposed, multi-resource heterogeneous database is generated, and then the GPS, Loop, and Video data are fused. The fusion results provide comprehensive traffic information for Dynamic Traffic Routing System and Traveler. Finally, the effectiveness of the proposed model was validated by the Dynamic Traffic Routing System of Nanning. © Springer-Verlag Berlin Heidelberg 2014.

Yu L.,Yunnan Land and Resources Vocational College | Deng L.,CAS Yunnan Astronomical Observatory | Feng S.,Kunming University of Science and Technology
Chinese Control Conference, CCC | Year: 2014

Sunspots are dark areas with respect to their surrounding area because the temperature of sunspot areas is lower than the average temperature of the solar surface. It provides essential information for many aspects of solar physics. A sunspot is composed of umbra and penumbra. It is a prerequisite for studying solar physics and spatial atmosphere to accurately segment and extract sunspot structures. Consequently, we propose an automated detection technique for segmenting and extracting them. The detection procedure is composed of two steps: (1) segmenting and extracting sunspot umbra with morphological reconstruction; (2) detecting and segmenting sunspot penumbra with region growing. For evaluating the accuracy of the detection procedure, we used a high-resolution observation obtained by Solar Optical Telescope onboard Hinode, and other obtained with the Dutch Open Telescope to illustrate the performance. The results demonstrate that our proposed technique is significant effective and accurate, and is suitable for studying the sunspot evolution and their physical phenomena. © 2014 TCCT, CAA.

Yu L.,Yunnan Land and Resources Vocational College | Liu X.,Yunnan Land and Resources Vocational College
Chinese Control Conference, CCC | Year: 2014

Prediction of natural disasters and their consequences is difficult due to the uncertainties and complexity of multiple related factors. Thus, developing a method of debris flows assessment seems necessary. Previous researchers have proposed several methods, such as regression analysis, fuzzy mathematics, and artificial neural networks for debris-flow hazard assessment. However, these methods need further improvements to eliminate the high relativity in their results. For improving the assessment of debris flows risk, a hybrid assessment model combined principal components analysis and rough set theory to determine hazard levels of debris flow in regions, with steps like determining hazard-level-type regions. Firstly, we use principal components analysis technique to reduce debris flows data, and attain a data set of attribute reduction. Secondly, we utilize rough set technique to classify the reduction set, and obtain a classification about debris flows risk assessment. Our proposed methodology was then illustrated to assess the regional debris hazard of Yunnan Province in China. The results indicate that the proposed debris flows risk assessment model is accurate and efficient, and can improve the comparability and reliability of the assessment to some degree. © 2014 TCCT, CAA.

Ru H.,Yunnan Land and Resources Vocational College | Peng D.,Yunnan Land and Resources Vocational College
Applied Mechanics and Materials | Year: 2013

This paper analyses the road traffic operation in four typical situations including un signalized junctions, signalized junctions, road sections and road networks in China. Four major factors such as road facilities, efficiency, safety and environment containing over twenty sub-factors are identified and weighed using analytic hierarchy process to form a holistic assessment index system which suggests a guideline for China's road traffic simulation study. © (2013) Trans Tech Publications, Switzerland.

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