SAGA：一种新的船舶搁浅预警模型     

龚安祥  胡勤友徐铁 《上海海事大学学报》2007,28(1):106-110

随着船舶自动识别系统(Automatic Identification System,AIS)和电子海图信息与显示系统(Electronic Chart Displayand Information System,ECDIS)的出现及普及,使船舶交通管理系统(Ves-sel Traffic Service,VTS)对其辖区的航行船舶进行自动搁浅预警成为可能.针对预警自动化水平较低这一现状,提出搁浅预警(Search Area for Grounding A lert,SAGA)模型,通过判断船舶SAGA领域内最小水深是否满足安全要求来实现船舶搁浅预警.  相似文献   

Heeding the Signals: Applying Web best Practices when Google recommends     

Dale Askey 《图书馆管理杂志》2015,55(1):49-59

Google is the single largest driver of traffic to library Web sites and digital repositories, and librarians would do well to listen when the search giant reveals information about its practices or makes recommendations. Recently, Google announced that it would begin to favor Web sites that use the secure hypertext transfer protocol (HTTPS) in its search results rankings. HTTPS encrypts data transmission and one of Google's stated reasons for this change is to help make the Web safer and minimize data theft. Similar announcements by Google have sometimes been ignored by librarians, to the peril of the visibility and use of library products and services on the Web.  相似文献   

《汽车发动机电控系统检修》学习情境设计     

高丽洁 《长江工程职业技术学院学报》2015,(1):64-65

学习情境是典型工作任务所包含的职业信息在教学过程中的体现,是培养学生综合职业能力的关键环节。基于汽车机电维修岗位的工作过程,开发汽车发动机电控系统检修课程,结合职业资格标准,设计出符合学生职业成长规律的学习情境。  相似文献   

Robots协议的法律效力探析--兼评百度诉360一案     

陈玮婧 《江苏广播电视大学学报》2015,(1)

自从奇虎360公司进军搜索引擎行业以来,其与百度公司之间的摩擦不断升级。百度在自己旗下的网站设置robots协议白名单,将360搜索引擎排除在外,而360则公然绕过robots协议,强行抓取百度网站页面。由于法律无明文规定,关于robots协议的法律效力值得探讨,但不管从哪个角度来分析,恶意越过ro-bots协议强行抓取网页或窥探隐私都应受到法律制裁,其具体是违反著作权法还是构成不正当竞争行为应视具体情况加以分析与选择。  相似文献   

基于游戏引擎的第三人称射击类案例制作解析     

章国雁 《安徽职业技术学院学报》2021,(1):29-32

随着游戏行业的高速发展,游戏引擎逐渐成为游戏开发领域的主流开发工具,其中Unity3D游戏引擎具有较好的跨平台特性。文章通过使用Unity3D游戏引擎进行第三人称射击官方案例的制作解析,包括游戏资源的导入、游戏主角的移动、受到伤害及死亡、游戏主角发动攻击、Mecanim动画系统、游戏怪物的AI、游戏怪物受到伤害及死亡等主要功能的讲解,展现了第三人称射击类案例的制作流程,对于从事游戏开发研究具有较好地实用性。  相似文献   

基于鱼群的PSO粒子滤波算法     

高晓林 《科技广场》2014,(9)

粒子群优化(PSO)粒子滤波算法比较而言,容易陷入局部最优,因此算法的准确度就会降低。本文在解决该问题时引入了一种基于鱼群的PSO粒子滤波算法。此算法是通过鱼群优化在采样过程中找到全局最优的相对位置,使其能够向全局最优的位置逐渐接近,同时提高估计有效的粒子数目,从而能够更有效的减少粒子退化与枯竭问题。实验表明,此算法与PSO粒子滤波算法相比,在估计准确度方面有了较大的提升。  相似文献   

基于知识图谱的国际搜索引擎研究历程与热点演进     

王兴旺  张欣 《科技管理研究》2014,(22)

对国际上搜索引擎领域的研究文献进行比较细致、深入的考察,采用可视化方法进行定量分析并制作有关知识图谱,明晰国际搜索引擎研究的总体趋势和发展脉络。通过对高被引文献的深入解读和定性分析,以及近几年相关文献的共词分析,揭示国际上搜索引擎研究的起源和发展,以及从进入快速发展期至今四个阶段的研究热点演进历程。最后,总结和展望国际搜索引擎研究的热点方向。  相似文献   

模糊伸缩约束控制下柴油机油液铁谱检测设计     

刘西全 《科技通报》2014,(10)

船舶柴油机的油液铁谱分析是实现故障诊断的重要方法。基于油液铁谱分析的船舶柴油机故障的传统检测方法是采用超声波固-液界面检测算法,导致柴油机故障信号出现环绕波齐次衰减,故障诊断效果不好。提出一种基于模糊伸缩约束控制柴油机油液铁谱分析的故障诊断方法,基于DSP设计船舶柴油机油液铁谱制谱仪和铁谱故障检测硬件系统,采用ADSP-BF537设计油液铁谱分析的电源,选用ADM706SAR芯片设计电路复位。算法设计中,构建油液铁谱分析能量模糊规则方程,设定模糊伸缩约束控制条件补偿油液铁谱分析模型的不确定性,实现对故障的准确定位和检测。实验结果表明,采用该方法进行柴油机故障信号油液铁谱分析和故障诊断,故障亮点定位准确,具有多故障状态监测应答的性能,故障准确发现概率提高显著。  相似文献   

Learning assessments in search-as-learning: A survey of prior work and opportunities for future research     

《Information processing & management》2022,59(2):102821

People often search for information in order to learn something new. In recent years, the “search-as-learning” movement has argued that search systems should be better designed to support learning. Current search systems (especially Web search engines) are largely designed and optimized to fulfill simple look-up tasks (e.g., navigational or fact-finding search tasks). However, they provide less support for searchers working on complex tasks that involve learning. Search-as-learning studies have investigated a wide range of research questions. For example, studies have aimed to better understand how characteristics of the individual searcher, the type of search task, and interactive features provided by the system can influence learning outcomes. Learning assessment is a key component in search-as-learning studies. Assessment materials are used to both gauge prior knowledge and measure learning during or after one or more search sessions. In this paper, we provide a systematic review of different types of assessments used in search-as-learning studies to date. The paper makes the following three contributions. First, we review different types of assessments used and discuss their potential benefits and drawbacks. Second, we review assessments used outside of search-as-learning, which may provide insights and opportunities for future research. Third, we provide recommendations for future research. Importantly, we argue that future studies should clearly define learning objectives and develop assessment materials that reliably capture the intended type of learning. For example, assessment materials should test a participant’s ability to engage with specific cognitive processes, which may range from simple (e.g., memorization) to more complex (e.g., critical and creative thinking). Additionally, we argue that future studies should consider two dimensions that are understudied in search-as-learning: long-term retention (i.e., being able to use what was learned in the long term) and transfer of learning (i.e., being able to use what was learned in a novel context).  相似文献   

搜索引擎的智能化与网络信息资源的检索研究   总被引：14，自引：1，他引：13  

赵红 《现代图书情报技术》2003,(5):51-54

在网络信息资源检索的研究中，搜索引擎的研究具有非常重要的意义。本文在基于对现有搜索引擎的分析的基础上，阐述了搜索引擎的智能化发展，以及将会从根本上改变现有信息资源检索方式和信息服务模式。  相似文献