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Integration system research and development for three-dimensional laser scanning information visualization in goaf 被引量:1
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作者 罗周全 黄俊杰 +2 位作者 罗贞焱 汪伟 秦亚光 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第7期1985-1994,共10页
An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, clo... An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable. 展开更多
关键词 GOAF laser scanning visualization integration system 1 Introduction the goaf formed through underground mining of mineral resources is one of the main disaster sources threatening mine safety production [1 2]. Effective implementation of goaf detection and accurate acquisition of its spatial characteristics including the three-dimensional morphology the spatial position as well as the actual boundary and volume are important basis to analyze predict and control disasters caused by goaf. In recent years three-dimensional laser scanning technology has been effectively applied in goaf detection [3 4]. Large quantities of point cloud data that are acquired for goaf by means of the three-dimensional laser scanning system are processed relying on relevant engineering software to generate a three-dimensional model for goaf. then a general modeling analysis and processing instrument are introduced to perform subsequent three-dimensional analysis and calculation [5 6]. Moreover related development is also carried out in fields such as three-dimensional detection and visualization of hazardous goaf detection and analysis of unstable failures in goaf extraction boundary acquisition in stope visualized computation of damage index aided design for pillar recovery and three-dimensional detection
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就业率统计偏差的原因探讨
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作者 吴小平 陈国树 《四川职业技术学院学报》 2005年第3期25-26,共2页
就业率的计算依赖于两个重要指标,一是劳动力资源总量,二是就业人口数。以人口普查资料为基准计算劳动力资源总量比较准确,而由城镇单位劳动统计、工商行政管理对私营企业和个体工商户的行政登记,以及乡村就业人员统计三者组成的“三合... 就业率的计算依赖于两个重要指标,一是劳动力资源总量,二是就业人口数。以人口普查资料为基准计算劳动力资源总量比较准确,而由城镇单位劳动统计、工商行政管理对私营企业和个体工商户的行政登记,以及乡村就业人员统计三者组成的“三合一”劳动统计得到的就业人口数不准确,存在很多问题,造成就业率统计偏差。 展开更多
关键词 就业率 劳动力资源总量 就业人口 统计偏差
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