Journals
  Publication Years
  Keywords
Search within results Open Search
Please wait a minute...
For Selected: Toggle Thumbnails
Study on Endogenous Dynamics and Evaluation of Intensive Use of Construction Land Based on the Perspective of Elements
ZU Jian, HAO Jinmin, AI Dong, WANG Nan, LI Mu, ZHANG Yibin
Acta Scientiarum Naturalium Universitatis Pekinensis    2020, 56 (4): 745-754.   DOI: 10.13209/j.0479-8023.2020.006
Abstract877)   HTML    PDF(pc) (1050KB)(68)       Save
Based on the perspective of factors, this study used the literature method and comprehensive analysis method to draw on the basic theory, and deeply analyzed the endogenous dynamics and characteristics of the intensive use of construction land, and then discussed and constructed the framework of the construction land intensive evaluation system. An empirical study was conducted in nine cities (autonomous prefectures) in Guizhou Province. The conclusions show that: 1) The intensive use of construction land has its own objective laws. Its endogenous driving force includes population power, natural power and economic power. Policy systems, planning and control, and technological advancement are taken as its exogenous driving force through supply and demand mechanisms and aggregation effects. Mechanisms and factor substitution mechanisms lead to changes in the number and structural changes of endogenous motive elements, thus resulting in different intensive utilization types and intensive utilization levels. 2) The evaluation of construction land intensive degree is a comprehensive evaluation, and its expression is no longer confined to the intensive integration of single land elements, but should be an intensive ensemble of all factors that covers the degree of intensive population factors, the degree of intensive energy components and the degree of intensive economic factors. The evaluation index system should also include the population factor criteria layer, the energy factor criteria layer and the economic factor criteria layer. 3) The process of intensive land use of full element for construction land in Guizhou Province is relatively slow, and the intensive degree of construction land in most cities (autonomous prefectures) is in a fluctuation trend. The spatial pattern of intensive use of construction land in Guizhou Province have been optimized, and the spatial variability shows a trend of decreasing first and then increasing from 2010 to 2016. 4) The levels of intensive utilization of nine cities (autonomous prefectures) in the province are dominated by low-level intensive use and low-level extensive utilization, and population factors and economic factors play a major intrinsic impetus.
Related Articles | Metrics | Comments0
Research on Example-Based Phrase Pairs in Statistical Machine Translation
LI Qiang, LI Mu, ZHANG Dongdong, ZHU Jingbo
Acta Scientiarum Naturalium Universitatis Pekinensis    2016, 52 (1): 113-119.   DOI: 10.13209/j.0479-8023.2016.007
Abstract1126)   HTML    PDF(pc) (465KB)(765)       Save

Abstract Due to the sparsity of data and the limitation of bilingual data size, many high-quality phrase pairs can’t be generated. The example-based phrase pairs proposed by the authors are generated through decomposing, substituting and generating the typical phrase pairs, and the typical phrase pairs are generated by the typical phrase extraction method in phrase-based statistical machine translation. On the Chinese-to-English Newswire and Oral translation tasks, the experimental results demonstrate significant improvements achieved by the proposed methods. Moreover, a gain of about 1% BLEU score increase is yielded on some test sets.

Related Articles | Metrics | Comments0