为更直观地了解与分析国内外智能交通系统领域研究发展的现状,基于中国知网与Web of Science数据库,选用CiteSpace科学计量软件,绘制关键词共现与时区演化等知识图谱,系统梳理国内外智能交通系统领域的研究热点与演化趋势。研究结果表明...为更直观地了解与分析国内外智能交通系统领域研究发展的现状,基于中国知网与Web of Science数据库,选用CiteSpace科学计量软件,绘制关键词共现与时区演化等知识图谱,系统梳理国内外智能交通系统领域的研究热点与演化趋势。研究结果表明:近年来,在中国,该领域研究呈“东密西疏”的分布特点;美国、欧洲、韩国、新加坡等地对该领域的研究较多。无论研究者来自何方,该领域研究均呈现出将传统交通系统与新兴技术相融的趋势。而中国的学者则更多侧重于通过政策引领科技发展,而中国以外的国家和地区的研究者则相对更注重通过基础研究助力行业发展。交通大数据是目前研究的重点之一,中国学者的研究更侧重于整体的交通规划与建设。未来,中国应继续强化基础技术研发,推进车、路、云协同一体化建设,注重混合交通流等问题,推进中国智能交通系统的深入发展。展开更多
Land use change and its eco-environmental responses are foci in geographical research. As a region with uneven economic development, land use change and eco-environmental responses across Jiangsu Province are relevant...Land use change and its eco-environmental responses are foci in geographical research. As a region with uneven economic development, land use change and eco-environmental responses across Jiangsu Province are relevant to China＇s overall development pattern. The external function of regional land use changes during different stages of economic development. In this study, we proposed a novel classification system based on the dominant function of land use according to ＂production-ecology-life＂, and then analyzed land use change and regional eco-environmental responses from a functional perspective of regional development. The results showed that from 1985 to 2008, land use change features in Jiangsu were that productive land area decreased and eco- logical and living land areas increased. Land use changes in southern Jiangsu were the most dramatic. In southern and central parts of Jiangsu the agricultural production function weakened and urban life service function strengthened; in northern Jiangsu, the mining production function＇s comparative advantage highlighted that the rural life service function was weakening. Ecological environmental quality decreased slightly in Jiangsu and its three regions. The maximum contribution rate to ecological environmental change occurred in southern Jiangsu and the minimum rate was located in the north. Eco-environmental quality deteriorated in southern and central Jiangsu, related to expanding construction land in urban and rural areas. Ecological environmental quality deterioration in northern Jiangsu is probably due to land development and consolidation. The main reason for improvements in regional ecological environments is that agricultural production land was converted to water ecological land across Jiangsu.展开更多
文摘为更直观地了解与分析国内外智能交通系统领域研究发展的现状,基于中国知网与Web of Science数据库,选用CiteSpace科学计量软件,绘制关键词共现与时区演化等知识图谱,系统梳理国内外智能交通系统领域的研究热点与演化趋势。研究结果表明:近年来,在中国,该领域研究呈“东密西疏”的分布特点;美国、欧洲、韩国、新加坡等地对该领域的研究较多。无论研究者来自何方,该领域研究均呈现出将传统交通系统与新兴技术相融的趋势。而中国的学者则更多侧重于通过政策引领科技发展,而中国以外的国家和地区的研究者则相对更注重通过基础研究助力行业发展。交通大数据是目前研究的重点之一,中国学者的研究更侧重于整体的交通规划与建设。未来,中国应继续强化基础技术研发,推进车、路、云协同一体化建设,注重混合交通流等问题,推进中国智能交通系统的深入发展。
基金National Natural Science Foundation of China(71503117,41301651)A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘Land use change and its eco-environmental responses are foci in geographical research. As a region with uneven economic development, land use change and eco-environmental responses across Jiangsu Province are relevant to China＇s overall development pattern. The external function of regional land use changes during different stages of economic development. In this study, we proposed a novel classification system based on the dominant function of land use according to ＂production-ecology-life＂, and then analyzed land use change and regional eco-environmental responses from a functional perspective of regional development. The results showed that from 1985 to 2008, land use change features in Jiangsu were that productive land area decreased and eco- logical and living land areas increased. Land use changes in southern Jiangsu were the most dramatic. In southern and central parts of Jiangsu the agricultural production function weakened and urban life service function strengthened; in northern Jiangsu, the mining production function＇s comparative advantage highlighted that the rural life service function was weakening. Ecological environmental quality decreased slightly in Jiangsu and its three regions. The maximum contribution rate to ecological environmental change occurred in southern Jiangsu and the minimum rate was located in the north. Eco-environmental quality deteriorated in southern and central Jiangsu, related to expanding construction land in urban and rural areas. Ecological environmental quality deterioration in northern Jiangsu is probably due to land development and consolidation. The main reason for improvements in regional ecological environments is that agricultural production land was converted to water ecological land across Jiangsu.
