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Land cover dynamics of different topographic conditions in Beijing,China

Frontiers in Biology 2007年第4期2卷 463-473页

作者： WU Xiaopu TANG Zhiyao CUI Haiting FANG Jingyun Department of Ecology Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China Chinese Research Academy of Environmental Sciences Beijing 100012China

Topographic conditions play an important role in controlling land cover dynamic *** this study,remotely sensed data and the geographic information system were applied to analyze the changes in land cover along topographic gradients from 1978 to 2001 in Beijing,a rapidly urbanized mega city in *** study was based on five periods of land cover maps derived from remotely sensed data:Landsat MSS for 1978,Landsat TM for 1984,1992,1996 and 2001,and the digital elevation model(DEM)derived from 1:250,000 topographic *** whole area was divided into ten land cover types:conifer forest,broadleaf forest,mixed forest,shrub,brushwood,meadow,farmland,built-up,water body and bare *** results are summarized as follows.(1)Shrub,forest,farmland and built-up consist of the main land cover types of the Beijing *** most significant land cover change from 1978 to 2001 was the decrease of the farmland and expansion of the built-up *** decreased from 6354 to 3813 km^(2)in the 23 years,while the built-up area increased from 421 to 2642 km^(2).Meanwhile,the coverage of forest increased from 17.2%to 24.7%of the total *** conversion matrix analysis indicated that the transformation of farmland to the built-up area was the most significant process and afforesta-tion was the primary cause of the replacement of shrub to forest.(2)Topographic conditions are of great importance to the distribution of land cover types and the process of land cover *** has an intensive impact on the dis-tribution of land cover *** area below 100 m mostly consists of farmland and built-up areas,while the area above 100 m is mainly covered by shrub and *** has the maximum frequency in areas between 100 and 1000 m,while forest has dominance in areas above 800 *** to the analysis of land cover changes in different ranges of elevation,the greatest change below 100 m was the process of *** process of the main land cover change occu

关键词： land use/land cover topographical factors conversion matrix remote sensing DEM vegetation

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Emotional State Transition Model Based on Stimulus and Personality Characteristics

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China Communications 2013年第6期10卷 146-155页

作者：彭晓兰解仑刘欣王志良 School of Computer and Communication Engineering University of Science and Technology Beijing Beijing Key Laboratory of Knowledge Engineering for Materials Science School of Automation and Electrical Engineering University of Science and Technology Beijing

In order to use mathematical methods to study how cognitive reappraisal strategies affect the output state of emotions,Gross's cognitive reappraisal strategy is transformed into a quantitative parameter which is proposed to describe the general perception of emotional events on the basis of the emotion *** to Gross's emotional regulation model,the Finite State Machine(FSM) model is used for describing the process of emotional state transition and the Likert 5 grading scale is introduced to study the level of an individual's reappraisal according to the participant's *** experimental results verify that the algorithm can effectively describe the relationship between the reappraisal strategy,emotional events and an emotiongenerative *** are multiple dimensions of a human's emotional ***,in the field of human-computer interaction,further research requires the development of a specific algorithm which can be implemented by a computer for the emotion regulation process.

关键词： emotion regulation reappraisal emotional events conversion matrix

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