地理信息系统简称GIS,是Geographic Information System的缩写,它是在电脑的软件系统和硬件系统基础上建立的一个技术系统,以描述、显示、分析、运算、管理、储存、以及采集整个或部分地球表层以及大气层空间中的有关地理分布数据。认...地理信息系统简称GIS,是Geographic Information System的缩写,它是在电脑的软件系统和硬件系统基础上建立的一个技术系统,以描述、显示、分析、运算、管理、储存、以及采集整个或部分地球表层以及大气层空间中的有关地理分布数据。认识和解决GIS工程建设中遇到的相关问题,对于有关应用软件的开发和完善,具有重要的指导意义。本文主要从地理信息系统(GIS)工程建设的发展概况、一般流程、应用模式及关键性因素等几个方面,阐述了GIS工程建设中的一般性问题,指出了我国GIS工程建设中存在的一系列问题。展开更多
Objective: The aim of our study was to investigate the epidemiological characteristics of esophageal cancer from 2009 to 2011 in Huai'an area, China. Methods: The data about the incidence and mortality of esophage...Objective: The aim of our study was to investigate the epidemiological characteristics of esophageal cancer from 2009 to 2011 in Huai'an area, China. Methods: The data about the incidence and mortality of esophageal cancer were provid- ed by Huai'an Cancer Registry, and the epidemiological characteristics of the disease were analyzed. Results: Esophageal cancer was not only the first most common cancer, but also the leading cause of cancer death in Huai'an area. The crude and standardized incidence rates were 62.91/10 5 and 49.92/10 5 , and the crude and standardized mortality rates were 46.75/10 5 and 36.87/10 5 , respectively. The sex ratio (male-female) was 1.69:1 in incidence, and the incidence increased in people aged 40 years and over, reaching the peak at the ages of 70-75 years. The mortality rate was at low level under the age of 50 years, but increased after the age of 50 years, reaching the peak at the age of 75-85 years. Incidence and mortality rates varied regionally with the highest rate found in Chuzhou district (90.76/10 5 and 67.17/10 5 ) and lowest rate observed in Qinghe district (32.41/10 5 and 8.75/10 5 ). Conclusion: Esophageal cancer is the major burden of cancer in Huai'an area, and has marked geographic distribution difference. The key period of age for screening and prevention of the disease is 55-85 years old.展开更多
Data processing is a basic and crucial factor in seismic exploration,which can influence the effect of subsequent processing directly. Thus the selection of appropriate method for data processing is one of the most im...Data processing is a basic and crucial factor in seismic exploration,which can influence the effect of subsequent processing directly. Thus the selection of appropriate method for data processing is one of the most important tasks throughout the work. By simulating,the authors analyze and compare Fractional Fourier Transform( FRFT) and Wigner-Ville distribution( WVD),then summarize the similarities and advantages and disadvantages of the two methods. The results reveal that FRFT is more effective and suitable for application in seismic exploration than WVD.展开更多
Technological innovation plays an important role in the dynamics of economic growth and in promoting the welfare of the general population. In support of this hypothesis, an empirical study was carried out to assess t...Technological innovation plays an important role in the dynamics of economic growth and in promoting the welfare of the general population. In support of this hypothesis, an empirical study was carried out to assess the spatial distribution of insulin and supplies （glucometers） for the control of diabetes in patients registered in the Public Healthcare System in Salvador, Bahia, from 1998 to 2012. In order to achieve this objective, we applied a combination of data collection strategies, including spatial analysis and discrete choice model estimation. The study proposed to answer the following question： What factors affect access to the supplies required to control diabetes in insulin-dependent patients？ To this end, we assessed the spatial distribution of diabetic patients in Salvador who had received glucometers. The hypothesis asserted that social, economic and geographical factors determine access to the supplies （glucometers） used to control diabetes. Exploratory Spatial Data Analysis （ESDA） was therefore performed using the Global Spatial Autocorrelation Index in order to analyze the spatial distribution of glucometers. We then performed econometric estimations and analyzed the results. The final results initially demonstrated that there were major inconsistencies in the distribution of glucometers; i.e. purely random factors largely determined the probability of obtaining this device. Individual characteristics were not decisive factors in the probability of obtaining a glucometer, which were insteadrelated to type of diabetes and recommended treatment.展开更多
GIS地理信息系统(Geographic Information System),是以地理空间数据库为基础,在计算机软硬件支持下,对整个或部分地球表层(包括大气层)空间中的有关地理分布数据进行采集、储存、管理、运算、分析、显示和描述的技术系统。近十几年来,...GIS地理信息系统(Geographic Information System),是以地理空间数据库为基础,在计算机软硬件支持下,对整个或部分地球表层(包括大气层)空间中的有关地理分布数据进行采集、储存、管理、运算、分析、显示和描述的技术系统。近十几年来,GIS技术得到了迅速发展,应用几乎涉及所有领域。目前主要应用于交通运输、军事公安、展开更多
文摘地理信息系统简称GIS,是Geographic Information System的缩写,它是在电脑的软件系统和硬件系统基础上建立的一个技术系统,以描述、显示、分析、运算、管理、储存、以及采集整个或部分地球表层以及大气层空间中的有关地理分布数据。认识和解决GIS工程建设中遇到的相关问题,对于有关应用软件的开发和完善,具有重要的指导意义。本文主要从地理信息系统(GIS)工程建设的发展概况、一般流程、应用模式及关键性因素等几个方面,阐述了GIS工程建设中的一般性问题,指出了我国GIS工程建设中存在的一系列问题。
基金Supported by grants from the Medical Science and Technology Innovation Foundation of Nanjing Military Command of Chinese People’s Liberation Army (No. 08MA036)Jiangsu Province Preventive Medicine Foundation (No. YZ201008)
文摘Objective: The aim of our study was to investigate the epidemiological characteristics of esophageal cancer from 2009 to 2011 in Huai'an area, China. Methods: The data about the incidence and mortality of esophageal cancer were provid- ed by Huai'an Cancer Registry, and the epidemiological characteristics of the disease were analyzed. Results: Esophageal cancer was not only the first most common cancer, but also the leading cause of cancer death in Huai'an area. The crude and standardized incidence rates were 62.91/10 5 and 49.92/10 5 , and the crude and standardized mortality rates were 46.75/10 5 and 36.87/10 5 , respectively. The sex ratio (male-female) was 1.69:1 in incidence, and the incidence increased in people aged 40 years and over, reaching the peak at the ages of 70-75 years. The mortality rate was at low level under the age of 50 years, but increased after the age of 50 years, reaching the peak at the age of 75-85 years. Incidence and mortality rates varied regionally with the highest rate found in Chuzhou district (90.76/10 5 and 67.17/10 5 ) and lowest rate observed in Qinghe district (32.41/10 5 and 8.75/10 5 ). Conclusion: Esophageal cancer is the major burden of cancer in Huai'an area, and has marked geographic distribution difference. The key period of age for screening and prevention of the disease is 55-85 years old.
文摘Data processing is a basic and crucial factor in seismic exploration,which can influence the effect of subsequent processing directly. Thus the selection of appropriate method for data processing is one of the most important tasks throughout the work. By simulating,the authors analyze and compare Fractional Fourier Transform( FRFT) and Wigner-Ville distribution( WVD),then summarize the similarities and advantages and disadvantages of the two methods. The results reveal that FRFT is more effective and suitable for application in seismic exploration than WVD.
文摘Technological innovation plays an important role in the dynamics of economic growth and in promoting the welfare of the general population. In support of this hypothesis, an empirical study was carried out to assess the spatial distribution of insulin and supplies （glucometers） for the control of diabetes in patients registered in the Public Healthcare System in Salvador, Bahia, from 1998 to 2012. In order to achieve this objective, we applied a combination of data collection strategies, including spatial analysis and discrete choice model estimation. The study proposed to answer the following question： What factors affect access to the supplies required to control diabetes in insulin-dependent patients？ To this end, we assessed the spatial distribution of diabetic patients in Salvador who had received glucometers. The hypothesis asserted that social, economic and geographical factors determine access to the supplies （glucometers） used to control diabetes. Exploratory Spatial Data Analysis （ESDA） was therefore performed using the Global Spatial Autocorrelation Index in order to analyze the spatial distribution of glucometers. We then performed econometric estimations and analyzed the results. The final results initially demonstrated that there were major inconsistencies in the distribution of glucometers; i.e. purely random factors largely determined the probability of obtaining this device. Individual characteristics were not decisive factors in the probability of obtaining a glucometer, which were insteadrelated to type of diabetes and recommended treatment.
文摘GIS地理信息系统(Geographic Information System),是以地理空间数据库为基础,在计算机软硬件支持下,对整个或部分地球表层(包括大气层)空间中的有关地理分布数据进行采集、储存、管理、运算、分析、显示和描述的技术系统。近十几年来,GIS技术得到了迅速发展,应用几乎涉及所有领域。目前主要应用于交通运输、军事公安、
