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Search Results: 1 - 10 of 18081 matches for " 雷正桥? "
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基于空域可恢复信息隐藏的图像安全人工退化算法
正桥,肖 迪?
计算机科学 , 2015, DOI: 10.11896/j.issn.1002-137X.2015.03.034
Abstract: 为了满足数字图像先用后买的商务模式的需要,提出了一种基于空域可恢复信息隐藏的数字图像人工退化算法。该算法使用可恢复信息隐藏算法中的直方图平移技术来嵌入补偿矩阵,以达到最终恢复精确原始图像的目的。通过控制嵌入深度,可得到与原始图像相比有较大失真但又能获知主要信息的公开图像。在嵌入过程中采用置乱以及加密技术,使得入侵者在没有得到授权文件的情况下无法强行恢复出原始图像。实验结果表明,该算法既可以得到与原始图像相差较大的公开图像,又能在得到安全认可的情况下完整地恢复出原始图像。
国家主体功能区战略背景下东北地区城市经济增长的动力与路径——基于城市暂住人口视角
正桥,王良健
地理研究 , 2013, DOI: 10.11821/yj2013040011
Abstract: 经济、人口、资源与环境的协调发展是新型城市化战略的核心,也是国家主体功能区规划的重要内容。鉴于各类主体功能区在东北地区并存,考察其经济增长与城市化开发路径,可为全国提供较好借鉴。以东北地区城市暂住人口为切入点,探讨了城市暂住人口与经济增长相互影响的作用机制,进而构建暂住人口与经济增长联立方程,并使用东北地区34个地级城市的面板数据进行实证分析,考量以暂住人口吸纳与承载能力为标志的城市化潜力与经济增长的动力。研究表明在国家主体功能区战略背景下,需充分尊重和考虑东北地区各类开发区域与城市的经济、社会、自然与生态状况,应通过中心城市产业结构调整、生态功能区人口迁出等途径进行集中均衡式的城市化开发,积极加快推进基本公共服务均等化和城市内部基础设施完善。
周期变推力控制滑行艇海豚运动的仿真分析
朱齐丹,正桥,刘志林
哈尔滨工程大学学报 , 2013, DOI: 10.3969/j.issn.1006??7043. 201212033
Abstract: 针对滑行艇高速运行下出现的海豚运动,研究了周期变推力对滑行艇纵向运动的控制.通过仿真,对不同艇体参数下发生海豚运动的风险进行了评估.开环仿真验证了周期变推力控制海豚运动原理,并得到了周期变推力影响滑行艇纵向运动的规律.通过检测滑行艇纵摇角信息,反馈给周期变推力形成闭环控制,使周期变推力施加的时机更精确,进而优化了减纵摇的效果.利用柴油机变转速控制仿真,验证了变推力控制海豚运动的应用性.仿真结果验证了所提方法的有效性,周期变推力控制能够有效抑制海豚运动,同时不损失滑行艇运行速度,保证了滑行艇运行的安全性和高效性.
基于196MC的光伏电动车控制系统设计
The Design of Photovoltaic Electric Vehicle Control System Based on 196MC
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Software Engineering and Applications (SEA) , 2012, DOI: 10.12677/sea.2012.11002
Abstract:

  要:本文采用MPPT控制算法,采用专为交流电动机调速使用的196MC单片机作为核心控制器,用光伏阵列为电动车供电,设计了具有MPPT性能的光伏电动车控制系统。该系统采用具备多种功能于一体的智能功率模块(IPM)作为逆变器,由196MC发出PWM信号对IPM进行控制,利用软件编程来实现电动车速度的调节,提高了单片机的使用效率。通过系统性能测试证实了该系统具有响应快、鲁棒性强、控制精度高等优点。

Abstract: Based on the MPPT control algorithm, the designed for ac motor speed control using 196 single chip computer as the core controller MC, with photovoltaic array for electric vehicle power supply, design a MPPT performance of photovoltaic electric vehicle control system. This system is used to perform a variety of functions in one of the intelligent power module (IPM) as inverter, by 196MC a PWM signal to the IPM to control, the use of software programming to realize electric vehicle speed adjustment, improve the efficiency in the use of single chip microcomputer. Through the system performance test confirmed that the system has a fast response and strong robustness and control precision higher advantages.

 

PLC在弹条生产机械手自动控制中的应用
The Application of PLC in the Production of Tan-Tiao Manipulator Automatic Control System
 [PDF]


Software Engineering and Applications (SEA) , 2012, DOI: 10.12677/sea.2012.11003
Abstract:

  要:本文首先分析了弹条机械手的工作原理,提出了将PLC用于弹条生产机械手控制系统中,不但提高了机械手生产的自动化水平以及系统的可靠性,而且结合现代组态技术,使得控制变得简单易行,满足了控制所需要的精度、大大提高了生产效率、节约了人力与物力资源,实际运行结果表明,该控制系统不仅具有很强的适应恶劣环境的能力,而且还保证了系统运行的可靠性、快速性。

Abstract: This paper first analyzes the article play manipulator work principle, this paper presents a PLC will be used to bomb a production manipulator control system, not only improve the manipulator production level of automation and reliability of system, and combined with the modern configuration technology, makes the control become simple, satisfy the control need precision, greatly increasing the production efficiency, save manpower and material resources, actual operation results show that the control system not only has a strong ability to adapt to bad environment, but also ensure that the system operation of the reliability and rapidity.

 

探析会展企业数字营销的传播策略
The Analysis of the Digital Marketing Communication Strategy of Exhibition Enterprises
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Modern Marketing (MOM) , 2012, DOI: 10.12677/mom.2012.22005
Abstract: 随着我国旅游产业国际化、信息化、综合化、关联化、竞争激烈化等特征的显现,我国会展产业也迎来了新的机遇。尤其是信息化发展给会展企业营销活动创造了新的条件,数字营销在会展企业中受到关注和应用。本文基于数字营销的基本特性,分析了会展企业数字化营销的现状与困境,提出网络化信息时代会展数字营销传播新策略,这对会展企业更好地开拓市场,创造顾客价值,推动展会国际化进程具有重要意义。
Along with internationalization and informatization, China’s tourism industry becomes more inte-grated, relational and competitive. At the same time, our exhibition industry welcomed a new opportunity. Especially the informatization development creates new conditions to the exhibition marketing activities. The digital marketing gets great concern and application in the exhibition business. Based on the basic character-istics of digital marketing,this paper analyses exhibition enterprise digital marketing situation and predica-ment. It also proposes new exhibition digital marketing communications strategy in the network information age. The new strategy helps the exhibition enterprises to a better marketing and customer value. It is mean-ingful of promoting the exhibition internationalization.
论湖南文化产业融合发展的三大趋势
Study on Three Major Trends of the Integration Development of Cultural Industry in Hunan
 [PDF]


Sustainable Development (SD) , 2014, DOI: 10.12677/SD.2014.43005
Abstract:
本文从文化与旅游、文化与科技以及文化与金融融合的角度,概括了湖南省文化产业融合发展的总体态势,分析了文化产业在融合发展中所遇到的困境,并就文化在旅游、科技和金融产业的融合过程中提出了更新观念、发挥市场配置资源、培养专业人才、注重环境保护、改善融合体制、加大文化产业金融的支持力度等多方面的对策建议,对推动文化产业健康发展提供了帮助。
This article summarizes the general situation of the development of fusion of the cultural industry in Hunan Province, and analyzes the difficulties of the cultural industry in the fusion development from the point of view of the integration of cultural and tourism, culture and science and technology, culture and financial. It also gives countermeasures and suggestions in many aspects as updating the concept, playing market allocation of resources, the cultivation of professional talent, environmental protection, improving the fusion system, increasing the culture industry financial support culture, which providing help of promoting the healthy development of the cultural in-dustry of Hunan.
湖南两系法杂交水稻种子生产时空决策计算机智能选择系统
Study on Climate Decision Support System for Seed Production Site of Two-Line Hybrid Rice
 [PDF]

东阳
Biophysics (BIPHY) , 2014, DOI: 10.12677/BIPHY.2014.23003
Abstract:
制种基地和时段的选择是两系杂交稻制种的成败的关键,本文提出了两系杂交稻制种三个安全期的概念,根据湖南省50年气象资料,在考虑气象要素与经、纬度及海拔高度的基础上,运用地理信息系统的空间分析方法,对湖南省两系杂交稻制种的风险进行了评估,研制出两系杂交稻种子生产的基地气象决策支持系统,依据此系统确定湖南省两系杂交稻制种的适宜区域与时段,为两系杂交稻的高产高效安全制种提供了强有力的技术支撑。
To select a suitable site and safe duration is very vital to the success of hybrid rice seed production for two-line hybrid rice seed production. The three safe periods that we should pay attention to are put forward. Using spatial analysis of GIS, the climate risk for seed production is assessed on the basis of Hunan climate data in 50 years and analysis on the relationship between climate factors and the longitude, latitude, height above sea level. The climate decision-making support system for seed production base area of two-line hybrid rice is designed and appropriate region and season for seed production are decided. The system provides the technical support for the site selection of the two line hybrid rice seed production.
粘性土剪切变形中渗透性试验 研究及数学模型
Experimental Study and Mathematical Model on Permeability of Clayey Soil with Shear Deformation
 [PDF]

红军
Advances in Porous Flow (APF) , 2014, DOI: 10.12677/APF.2014.41001
Abstract:
本文研制了一种新型的渗流试验设备,用以测定土体在发生剪切变形过程中不同物理力学状态条件下的渗透系数,针对某种粘性土进行了一系列试验,结果表明粘性土剪切变形过程中的渗透系数受到多种因素的影响,其中剪切应变和围压的影响最为显著。在此基础上提出了一个可反映土体物理状态变化及剪切中结构变化对其渗透性影响的数学模型,通过试验数据拟合验证,结果表明该模型可有效反映土体剪切变形过程中不同物理力学状态条件下的渗透系数
A new seepage device was developed to measure permeability of clayey soil under different physical and mechanical status with shearing deformations. A series of seepage tests were carried out on a certain clayey soil and indicated that permeability of the soil was related with many factors, among which the shearing strain and confining pressure were the most important. Based on the testing results and mechanism analysis, a new relation model of permeability to reflect effect of physical and mechanical status was raised. The model was then fitted and checked by the testing results.
Q225钢材损伤变量研究
Research on Damage Index of Steel Q225
 [PDF]


Hans Journal of Civil Engineering (HJCE) , 2014, DOI: 10.12677/HJCE.2014.33008
Abstract:

损伤变量是描述材料、构件或结构劣化程度的变量。首先对不同的损伤变量模型进行了评述,并选择适用于Q225钢材的损伤变量模型,基于Q225钢材单调拉伸和低周疲劳反复加载试验的结果,对所选择的损伤变量模型进行了修正,提出了合理的权重系数b,为Q225钢材在低周反复加载下力学性能的后续研究提供了基础。
Damage index describes the damage situation of materials, members and structures. Various damage index models were reviewed and the model suitable for Q225 steel materials was selected. Based on the result of monotonic loading tests and low-cycle cyclic loading tests on steel Q225, the selected damage index model was modified with the suggested weighting coefficient β. This provides the basis for further research on steel Q225.

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