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	1. A Velocity Measurement Method of three-stage Reconnection Launcher
	Zhou Zhengyang,Liao Minfu,Zhao Chun
	Surveying and Mapping Technology 01 April 2008
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	Abstract:The reconnection launcher, which launches solid projectile, is a kind of the electromagnetic launchers. The operation principle of the reconnection launcher is introduced. A model of three-stage reconnection launcher is set up by MATLAB and the velocity of the projectile is simulated. As the velocity of the projectile is a variant during the launch, a velocity measurement method for the three-stage reconnection launcher in practice is presented, on the basis of computer and micro controller unit (MCU). A practical three-stage reconnection launcher is fabricated and a 160g-plate projectile is launched. The final launched velocity is accelerated to 24.991m/s in three steps. A velocity curve is gained by this method and it is consistent with the simulated result.
	TO cite this article:Zhou Zhengyang,Liao Minfu,Zhao Chun. A Velocity Measurement Method of three-stage Reconnection Launcher[OL].[ 1 April 2008] http://en.paper.edu.cn/en_releasepaper/content/19979


	2. A “Raster -Vector” Integrated Approach
	Lina Huang,Bin Zheng,Lifan Fei
	Surveying and Mapping Technology 10 March 2008
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	Abstract:Since vector approach can be applied for accurate geo-processing, while raster approach is suitable for spatial analysis, the integration of raster and vector approaches has been studied for years. This paper attempts to advance a combined approach for geographic feature retrieve in a mechanism so called “raster: relation-vector: entity” combined approach. That is, using a “dimension-plus”relational raster, the topological information is examined within a foreseeable raster index time by reducing the need of calculating exact geometry of spatial objects. Such topological information is in turn to vector organization. Hence the complex geometric objects can be reconstructed using vector data within minimal time consumption. This research realizes the recognition and the rebuild of spatial entities described in geometric and semantic information based on vector data.
	TO cite this article:Lina Huang,Bin Zheng,Lifan Fei. A “Raster -Vector” Integrated Approach[OL].[10 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19145


	3. Temporal Uncertainty of Geographical Information
	Shu Hong
	Surveying and Mapping Technology 21 December 2007
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	Abstract:Temporal uncertainty is a crossing point of temporal and error-aware geographical information systems. In Geoinformatics, temporal uncertainty is of the same importance as spatial and thematic uncertainty of geographical information. However, until very recently, the standard organizations of ISO/TC211 and FGDC subsequently claimed that temporal uncertainty is one of geospatial data quality elements. Over the past decades, temporal uncertainty of geographical information is modeled insufficiently. To lay down a foundation of logically or physically modeling temporal uncertainty, this paper is aimed to clarify the semantics of temporal uncertainty to some extent. The general uncertainty is conceptualized with a taxonomy of uncertainty. Semantically, temporal uncertainty is progressively classified into uncertainty of time coordinates, changes, and dynamics. Uncertainty of multidimensional time (valid time, database time, and conceptual time, etc.) has been emphasized. It is realized that time scale (granularity) transition may lead to temporal uncertainty because of missing transition details. It is dialectically concluded that temporal uncertainty is caused by the complexity of the human-machine-earth system.
	TO cite this article:Shu Hong . Temporal Uncertainty of Geographical Information[OL].[21 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17214


	4. The stability estimation of irregular coal pillars
	cui ximin,Peng Xiaozhan,Yuan Debao,Zhao Rui,Zhang Bing,Ma Deming
	Surveying and Mapping Technology 12 March 2007
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	Abstract:The pillar stability is very important for the safety mining and the irregular pillar stability estimation is complicated than the regular pillar. Generally, the stability of irregular coal pillars is controlled by the width / height ratio, mining depth, tributary area and related to its spatial distribution. Based on the study of regular pillar stability estimation, the concept of efficient width is proposed and the Voronoi Diagram is introduced to determine the tributary area. The calculated results demonstrate that there are 72 failed pillars, 14 unstable pillars and 52 stable pillars in panel 404. A single pillar inadvertently fail the load could be transferred to adjacent pillars causing those to be overload. This successive overloading process leads to an unstable progressive “domino” effect whereby large areas of the mine occur.
	TO cite this article:cui ximin,Peng Xiaozhan,Yuan Debao, et al. The stability estimation of irregular coal pillars[OL].[12 March 2007] http://en.paper.edu.cn/en_releasepaper/content/11384


	5. Calibration models of Digital Cameras images
	Du Lili
	Surveying and Mapping Technology 13 March 2006
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	Abstract:This design compares three models for determining the internal and external parameters of a digital camera, included the model of considering the horizontal and vertical correction, the model of adding affinity deformation, the model of Luca Lucchese. In this paper, the work is that judging three models by the distortion coefficient, residuary distortion, the accuracy of examining spots .The results of the experiment suggest that the method of considering the horizontal and vertical correction has the better stabilization and veracity of distortion calibration. This model can still calibration the ordinary digital camera images well on the condition of only a little points for controlling, so it has the better usefulness in the practice
	TO cite this article:Du Lili. Calibration models of Digital Cameras images[OL].[13 March 2006] http://en.paper.edu.cn/en_releasepaper/content/5656

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