随着工业自动控制行业的快速发展,对DCS(Distributed Control System)控制系统应用的新需求不断提出。为了适应DCS控制系统的高可靠、智能化、开放性的需求,本文通过应用工业以太网技术,结合以太网的带宽资源,提出了一种新型DCS系统控...随着工业自动控制行业的快速发展,对DCS(Distributed Control System)控制系统应用的新需求不断提出。为了适应DCS控制系统的高可靠、智能化、开放性的需求,本文通过应用工业以太网技术,结合以太网的带宽资源,提出了一种新型DCS系统控制站硬件架构设计。该设计打破了传统DCS控制现场总线的瓶颈,实现了自主研发DCS控制系统高速传输,高实时性、高开放性,并具有灵活拓展的DCS控制站新的硬件拓扑结构。展开更多
The paper presents a set of techniques of digital watermarking by which copyright and user rights messages are hidden into geo-spatial graphics data,as well as techniques of compressing and encrypting the watermarked ...The paper presents a set of techniques of digital watermarking by which copyright and user rights messages are hidden into geo-spatial graphics data,as well as techniques of compressing and encrypting the watermarked geo-spatial graphics data.The technology aims at tracing and resisting the illegal distribution and duplication of the geo-spatial graphics data product,so as to effectively protect the data producer＇s rights as well as to facilitate the secure sharing of geo-spatial graphics data.So far in the CIS field throughout the world,few researches have been made on digital watermarking.The research is a novel exploration both in the field of security management of geo-spatial graphics data and in the applications of digital watermarking technique.An application software employing the proposed technology has been developed.A number of experimental tests on the 1：500,000 digital bathymetric chart of the South China Sea and 1：10,000 digital topographic map of Jiangsu Province have been conducted to verify the feasibility of the proposed technology.展开更多
Based on tropical cyclone yearbook data from 1949 to 2006, climate characteristics, such as interdecadal variation, period of tropical cyclone frequency, rainstorm and strong wind, intensity characteristics, were anal...Based on tropical cyclone yearbook data from 1949 to 2006, climate characteristics, such as interdecadal variation, period of tropical cyclone frequency, rainstorm and strong wind, intensity characteristics, were analyzed. Main results were as follows： tropical cyclone affecting Shanalong Province was mainly from the last ten-day of July to the last ten-day of August, and its interdecadal variation was obvious. The marked periodic variation of every 2.4 and 5 years was found according to power spectrum analysis. It showed obvious weakening tendency about tropical cyclone＇s intensity by using Kendall test. It also showed that August was the strongest month among a year for rainstorm frequency and intensity, and flood disaster was more easily to occur during this month. It was distinct for frequency＇s interdecadal variation of tropical cyclone causing rainstorm and strong wind. Marked period was existed about annual average precipitation and strong wind. At the same time, the cause of the variation was discussed.展开更多
文摘随着工业自动控制行业的快速发展,对DCS(Distributed Control System)控制系统应用的新需求不断提出。为了适应DCS控制系统的高可靠、智能化、开放性的需求,本文通过应用工业以太网技术,结合以太网的带宽资源,提出了一种新型DCS系统控制站硬件架构设计。该设计打破了传统DCS控制现场总线的瓶颈,实现了自主研发DCS控制系统高速传输,高实时性、高开放性,并具有灵活拓展的DCS控制站新的硬件拓扑结构。
基金Under the auspices of Jiangsu Provincial Science and Technology Fundation of Surveying and Mapping (No. 200416 )
文摘The paper presents a set of techniques of digital watermarking by which copyright and user rights messages are hidden into geo-spatial graphics data,as well as techniques of compressing and encrypting the watermarked geo-spatial graphics data.The technology aims at tracing and resisting the illegal distribution and duplication of the geo-spatial graphics data product,so as to effectively protect the data producer＇s rights as well as to facilitate the secure sharing of geo-spatial graphics data.So far in the CIS field throughout the world,few researches have been made on digital watermarking.The research is a novel exploration both in the field of security management of geo-spatial graphics data and in the applications of digital watermarking technique.An application software employing the proposed technology has been developed.A number of experimental tests on the 1：500,000 digital bathymetric chart of the South China Sea and 1：10,000 digital topographic map of Jiangsu Province have been conducted to verify the feasibility of the proposed technology.
基金Supported by the Projects of Shandong Meteorological Bureau,China(2012sdqxz04,2014sdqxm14)
文摘Based on tropical cyclone yearbook data from 1949 to 2006, climate characteristics, such as interdecadal variation, period of tropical cyclone frequency, rainstorm and strong wind, intensity characteristics, were analyzed. Main results were as follows： tropical cyclone affecting Shanalong Province was mainly from the last ten-day of July to the last ten-day of August, and its interdecadal variation was obvious. The marked periodic variation of every 2.4 and 5 years was found according to power spectrum analysis. It showed obvious weakening tendency about tropical cyclone＇s intensity by using Kendall test. It also showed that August was the strongest month among a year for rainstorm frequency and intensity, and flood disaster was more easily to occur during this month. It was distinct for frequency＇s interdecadal variation of tropical cyclone causing rainstorm and strong wind. Marked period was existed about annual average precipitation and strong wind. At the same time, the cause of the variation was discussed.
