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Search Results: 1 - 10 of 37964 matches for " 兰培真 "
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船舶操纵模拟器视景中的山形建模
,金一丞,尹勇,任鸿翔,孙腾达,刘斯云
中国图象图形学报 , 2001, DOI: 10.11834/jig.20010489
Abstract: 船舶操纵模拟器是一种能够部分模仿海上真实情况,专门为满足与培训、技术研究等目的而设计研制的装置,其核心技术之一是海上视景模拟,而地形地貌是海上视景中的重要组成部分,根据船舶操纵模拟器实时视景显示的需要,在分析航行舰艇对可视范围内重要岛屿与背景山脉的几何精神要求的基础上,提出了基于待高线的山形堆积建模和山形轮廓建模方法,并给出了山形轮廓图形的误差定义、有效适用范围,以及船舶操纵模拟器中地形建模的误差准则,该方法生成图形的数据量较小,其图形更新速率与几何精度能达到船舶操纵模拟器实时视景显示的要求。
不同视点重叠图象拼接方法研究
,马越,邱志雄,金一丞,石教英
中国图象图形学报 , 2002, DOI: 10.11834/jig.2002010318
Abstract: 不同视点重叠图象的拼接算法大都需要估计相机参数和每个像素的深度等。要求有较多的源图象,由于海上实景拍摄难度大,因此符合要求的源图象十分有限,这些现有的算法对于生成生成船舶操纵模拟器中的视景并不适用,根据船舶操纵模拟器对视景的要求和背景实景图象拍摄的具体要求,依据三维成像几何理论,建立了相邻重叠图象的成像几何模型,在此基础上经数学推算得出,仅当重叠区域中的两物点位于同一景深面上或位于两视点垂直平分面上时,在左右像面上两相应像点间的距离才不产生变化,由此提出在一定条件下的不同视点重叠图象的基于视点垂直平分面最深景物线和基于同深景物面平行景物线对的匹配算法和图象拼接的平滑算法,实验结果表明,该算法的拼接效果较好,可推广到对背景几何精度要求不高的中远距离不同视点重叠图象的拼接应用中。
Automatic Mosaic of Multi-viewpoint Overlapped Image
不同视点重叠图象拼接方法研究

LAN Pei-zhen,MA Yue,QIU Zhi-xiong,JIN Yi-cheng,SHI Jiao-ying,
,马越

中国图象图形学报 , 2002,
Abstract: The methods of multi-perspective mosaic ask mostly estimate the parameter of camera, the depth of every pixels, and more images. The ubiquitous disadvantage of these methods is over heavy calculation. On account of the difficulty of shooting on the sea, these methods will not serve the view of ship-handing simulator. So the mosaic method based on the simple 2D overlapped image is required, but the multi-perspective and shelter between the scenarios bring more difficulty. This paper construct a imaging geometric model of the overlapped images according the demand in view and background of ship-handing simulator, then proposes a automatic mosaic and smoothness method based on the most depth line on the vertical middle plane and the parallel line on the same depth plane. The experimental results show that the jointing efficiency of this algorithm is better, and it has wide application perspective at fields of multi-perspective mosaic.
参麦注射液对晚期癌肿患者免疫功能调节的实验研究
,
中国中药杂志 , 1995,
Abstract: 参麦注射液对晚期癌肿患者免疫功能调节的实验研究冯培芳,王真(浙江省中医院杭州310006)近几年来,在机体抗肿瘤的免疫效应机理中r-干扰素(IFNr)、自然杀伤细胞(NK)、淋巴因子激活的杀伤细胞(LAK)、白细胞介素-2(IL-2)及其受体(IL-2R)作用日益受到人们的关注。本文在运用参麦针治疗晚期癌肿的过程中,测定了可溶性白介素-2受体(sIL-2R)、NK及LAK活性和IFNr分泌量,旨在探讨参麦针抗肿瘤免疫效应。1研究对象正常对照组来自血库献血?...
无线传感器网络中源位置隐私保护方法
A privacy protection method of source location in wireless sensor networks

汪卫星,
- , 2018, DOI: 10.11835/j.issn.1000-582X.2018.03.012
Abstract: 随着物联网的迅猛发展,位置隐私被认为是传感器网络中一个重要的安全问题。传统的加密方法不能有效地防止攻击者通过逆向追踪的方式来找到监测物体的位置。针对这些问题并考虑到攻击者具有较强的可视能力,本文提出了一种基于区域和兄弟节点选择的位置隐私保护策略(PRABNS,phantom routing based on area and brother neighbor selecting)。该策略能够使幻影节点均匀分布在源节点周围,并通过对部分区域的选择来使相邻数据包间隔一定的角度,选择兄弟节点来增加源节点到基站路径的多样性。仿真结果表明,该策略能提供更好地隐私保护性,在不增加太多能耗的前提下延长了安全时间。
With the rapid development of the Internet of Things, the location privacy is considered as an important security issue in sensor networks. Traditional encryption methods cannot effectively prevent attackers finding the position of monitoring object by reverse tracing. To solve these problems and considering attackers have enhanced visibility, we propose a location privacy protection strategy called PRABNS (phantom routing based on area and brother neighbor selecting). The strategy can make the phantom nodes evenly distributed around the source node, and the adjacent data packet have a certain angle space through the selection of partial region, and thus it can increase the diversity for the path of source node to the base station by selecting sibling nodes. The simulation results show that the strategy can provide better privacy preservation, and extend the secure time without increasing too much energy consumption
Modeling Method for Hills in Visual System of Shiphandling Simulator
船舶操纵模拟器视景中的山形建模

LAN Pei-zhen,JIN Yi-cheng,YIN Yong,REN Hong-xiang,SUN Teng-d,LIU Si-yun,
,金一丞

中国图象图形学报 , 2001,
Abstract: Shiphandling simulator is a device that can partly imitate the true environment at sea,and is specially designed to satisfy marine education and trains and maritime research etc.One of its key techniques is to create the virtual environment at sea,and the terrain is its important component.According to the needs of the real time visual display of the shiphandling simulator, this paper analyses the requirements of the geometry precision of the important islands and background hills which are within the ships' visible scope,and brings forward the modeling methods of the hill's pileup and the hill's silhouette edges based on contour lines.It also presents the definition of error that the hill's silhouette edges graph has been given and the effective scope of application,and firstly established the error criterion of terrain model that is built in shiphandling simulator.With these two kinds of method,the size of data storage can be minimized greatly,and the requirements of high update rate and geometry precision for the real time visual display of the shiphandling simulator can be satisfied.
棉籽壳栽培金针菇小型试验

食品科学 , 1983,
Abstract: ?金针菇又名朴菇、绒柄金钱菌、构菌、(木夏)菌等等。在植物分类学中隶属于真菌门,担子菌纲、伞菌目、白蘑科,小火焰菌属(或金钱菌属)金针菇现在的学名是flammulinavelutipessing旧学名是collybiavelntipesqnel。金针菇是一种长柄,伞盖较小的食用菌。可做汤或炒食,在日本是上等火锅配料。一般产销季节多在冬令。也可制作罐头或冷冻保存,或制成干燥食品外
基于web2.0的信息检索研究型教学模式设计

图书情报工作 , 2011,
Abstract: ?分析基于web2.0的信息素养互动学习平台的功能及其在信息检索教学活动中的积极辅助作用,介绍将课题研究与信息检索课程教学过程紧密结合的研究型教学模式,阐明基于信息素养互动学习平台的信息检索课程研究型教学模式的实施过程。
慢肾宁合剂治疗类风湿性关节炎临床疗效及对t淋巴细胞亚群的影响

中国中医药信息杂志 , 2007,
Abstract:
激光小角光散射仪测定右旋糖酐分子量
周如,
药学学报 , 1989,
Abstract:
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