广告主与搜索引擎的双向博弈分析

文章基于萨缪尔森的双向叫价博弈模型,对关键词广告拍卖中的一类特殊情形进行研究—某些关键词广告的拍卖中只有一个广告主进行竞价。假设买方的估价是广告主的私有信息,而广告位的成本也是搜索引擎的私有信息,建立一个广告主和搜索引擎的双向叫价非完全信息贝叶斯博弈模型。在假设双方的报价策略均是自己估价的线性函数的条件下,求解了使广告主和搜索引擎收益最大化的贝叶斯纳什均衡,给出了广告主和搜索引擎的均衡报价策略,分析了拍卖能够达成时双方交易的效率,并得到了效率最高时双方的最优出价策略及最高效率。当广告主和搜索引擎第一次博弈不能达成交易时,双方会通过多次重复谈判和协商,经过多轮的重复报价序贯博弈达成最终交易,给出了双方序贯博弈的均衡报价策略;还给出了拍卖序贯博弈的交易流程图和一些数值算例。研究结果对广告主和搜索引擎的报价策略提供了理论参考依据。     

基于51单片机的六足机器人控制系统设计与制作

提出了基于51单片机控制的六足机器人系统,针对机器人的运动,采用三角步态方式对六足步态进行规划,设计电路和程序,使用单片机控制18路舵机的旋转角度实现行走。通过模型制作和实验,可控制机器人的行走,并且结合传感器实现了自动避障。实验表明51单片机可以对六足机器人进行控制,步态规划与程序设计合理。     

Travel queries on cities in the United States: Implications for search engine marketing for tourist destinations

Given the growing importance of search in online travel planning, marketers need to better understand the behavioural aspect of search engines use. Built upon a number of previous studies, the goal of this research is to identify patterns in online travel queries across tourist destinations. Utilizing transaction log files from a number of search engines, the analysis shows important patterns in the way travel queries are constructed as well as the commonalities and differences in travel queries about different cities in the United States. The ratio of travel queries among all queries about a specific city seems to associate with the “touristic” level of that city. Also, keywords in travelers' queries reflect their knowledge about the city and its competitors. This paper offers insights into the way tourism destinations are searched online as well as implications for search engine marketing for destinations.     

柴油机机油的选用与失效

柴油机的机油,如选用不恰当,会使柴油机功率降低,机械磨损加大。了解柴油机机油的质量粘度等级和失效方法,对延长柴油机使用寿命有益。     

康明斯发动机操作及维护保养要点

康明斯发动机采用国际上流行的标准集成化模块式设计,结构简单紧凑,配件通用化程度高。采用增压、增压中冷以及空气对空气中冷措施,仅改变与发动机动力有直接关系的零部件。可获得不同功率,不同用途的发机系列。为了使康明斯发动机更好使用,也使维修人员尽快地掌握维修技术,现将康明斯发动机操作及维护保养要点作简要的介绍。     

Search Engine Optimization and Pay-per-Click Marketing Strategies

Any e-commerce venture using a website as the main shop front should invest in marketing its website. In this study, the relationship between website owners having invested in search engine optimization (SEO) and pay-per-click (PPC), respectively, is investigated. The design used in this research involves an empirical field experimental approach in which implementation of both SEO and PPC are considered, with subsequent comparison of results. Data were gathered from Google search results after performing both Fat Head and Long Tail key-phrase searches based in various categories. Websites that were listed among the top 10 in the sponsored section of search results were recorded. These websites were then checked to see if they also had an SEO ranking within the top 100 for both the Fat Head and Long Tail key-phrases. It is found that website owners seldom invest in SEO as part of a search engine marketing (SEM) campaign. This seems to confirm some of the findings by other authors. This research has important implications for SEO and PPC practitioners, and for website owners. It should influence the way budgets on search engine marketing are applied. Finally, it could be used by marketing managers in better utilizing their limited SEM dollars. No evidence could be found that this kind of empirical research has been done, hence the results are considered to be unique.     

浅议轨道车发动机冒黑烟问题原因及解决方案

文章论述了轨道车发动机冒黑烟问题的原因以及检查方法和解决方案。     

创业型经济是中国经济发展的新引擎——基于后危机时代的视角

具有创新性、可持续性、自主性和风险性等特点的创业型经济是当今各国普遍重视的一种新型经济，是发达国家普遍追求的经济形态，也是中国在后危机时代背景下保持经济持续发展的必然选择。创业型经济不仅可以转变经济发展方式，建立创新型国家；而且可以充分扩大社会就业，推动经济可持续发展。后危机时代，中国从加强创业培训、优化创业环境、完善创业体系、健全创业法律制度等方面探索发展创业型经济的对策，使之成为中国经济发展的新引擎。     

面向Google搜索引擎的优化技术

针对Google搜索引擎,提出了网站优化策略。从导航优化、链接优化和页面优化等角度进行了分析。本文有益于网站的初级优化。     

搜索引擎工作原理浅析

随着因特网的迅猛发展，搜索引擎成为浏览者获取信息的主要途径之一。本文通过对搜索引擎5个主要环节的分析，介绍了搜索引擎的工作原理。