一种基于多Agent的元搜索引擎优化技术研究

针对现有搜索引擎存在的问题,提出基于多Agent的元搜索引擎系统。系统采用元搜索引擎结构,利用多Agent技术,结合数据库的分类和成员引擎的机器学习机制,多Agent通信合作,实现了资源选择的优化。对搜索结果的查询串信息进行相关度分析,将搜索结果位置信息和特征信息的相似度相结合,计算文档的相关评价得分,最后根据评价得分降序对输出文档排序。     

内燃叉车发动机配置与使用

论述柴油机成为内燃叉车发动机的主流，发动机润滑油消耗，叉车冷起动等。并对叉车未来发展予以展望。文中运用发动机理论知识，结合具体事例从机理，数据，操作方面进行分析探讨。     

浅析汽车发动机运转抖动的原因诊断

发动机运转抖动,不仅影响车辆的舒适性,还会影响动力性、经济性以及安全性。所以不能忽略发动机抖动带来的危害。本文以4G63发动机为例,就发动机抖动的成因,进行探究,以达到举一反三的目的。     

充分激发中国经济持续增长的内生动力——民营经济发展“十一五”回顾与“十二五”展望

"十一五"民营经济出现十大发展变化,已占经济半壁江山,这得益于国家实行了更加公平的法律政策,但在社会舆论上仍存在四大争议,在实际发展上仍面临三重障碍;"十二五"民营经济将呈现八大发展趋势,在经济中将三分天下有其二,要从六个方面采取有力措施,真正形成平等竞争新格局,充分激发其内生动力,使其为民富国强做出更大贡献。     

中小企业实施搜索引擎营销策略分析

搜索引擎是中小企业的一种有效网络营销手段。目前比较吸引企业的搜索引擎营销模式主要有搜索引擎竞价排名、关键词广告、搜索引擎优化等。中小企业搜索引擎营销策略包括基于搜索引擎的网站优化策略、基于搜索引擎的网站推广策略、基于搜索引擎的广告投放策略、基于搜索引擎的信息收集策略．以及这些策略综合形成的组合。随着搜索引擎市场规模不断扩大并稳步发展,我国搜索引擎用户数量快速增长,用户对搜索引擎高度认可并广泛使用,搜索引擎营销的前景广阔。     

The emergence of hybrid-electric cars: Innovation path creation through co-evolution of supply and demand

Hybrid-electric vehicles have experienced a significant rate of growth in the last 10 years. This is remarkable, since the automotive sector is typically averse to the more radical technological change of engines. The internal combustion engine has been around for more than 100 years after all.In this paper we describe and explain the emergence of electric engines in the automobile market after 1990. We explicate the role of techno-economic mechanisms alongside social and regulatory mechanisms (including the social meaning of an engine). The co-evolutionary analysis is novel in the integrated conception of actor perspectives, feedback effects and competition between products. We find three sources of lock-in through path dependency: from demand, supply as well as the regulatory side. We conclude that automotive engines were significantly locked into a trajectory of internal combustion technology due to techno-economic mechanisms, which produced inertia despite social pressures. The creation of an alternative path, on the other hand, initially stalled. Various stakeholders were unsuccessful in marketing their electric or hybrid-electric vehicles in the 1990s, such as Peugeot/Citroen with various electric models, or Audi with their Duo in 1997. However, after 2000 we find that sustaining efforts of California's Air Resources Board and Toyota were triggering creation of a new innovation path of hybrid-electric engines.     

The Dynamics of Online Purchase Visits: Inertia or Switching?

This paper studies the dynamics of online purchase patterns, focusing on the impact of the channel used on conversion probability, as well as the transition of channel use over time. A novel data set from a major Chinese online travel agency is used for analysis, consisting of four months of data with 24,337 store visits through three types of channels: direct visit, search advertising and referral. Results of a Bayesian multinomial logit model show that the search channel significantly affects consumers’ conversion probability, and show a high degree of inertia in channel use. This finding contrasts sharply with suggestions of previous research that most future purchases will converge to the direct-visit channel.     

8V165柴油机应用组合脉冲转换增压的试验研究

文章通过多方案模拟计算,优化出8V165机的MPC增压方案,并进行了零部件加工和整机试验,结果表明,在所有的运行工况下,柴油机的功率大幅度提高,耗油率和排温也有较大的下降,机械负荷变化不大。通过计算证明增压器的效率有较大幅度的提高。     

MTU16V396SE84潜用柴油机水下性能试验研究

潜用柴油机与一般柴油机相比,在结构和性能方面有很多特殊性。文章对MTU16V396SE84潜用柴油机在水下工作时的高背压起动、背压波动、跌落转速极限值及废气吹除压载水模拟试验四个特有性能进行了试验研究。     

基于规则引擎的土地数据质量检查方法

土地数据业务规则错综复杂,其检查规则常处于不断地更新变化中。目前的土地检查系统中检查规则基本上都是与程序代码绑定,规则变动困难,系统难以重用。为解决这一问题,提出基于规则引擎的土地数据质量检查方法的研究。利用规则学习方法,将方法应用于浙江省基本农田划定内业数据质量检查系统。研究结果表明规则可灵活修改,满足规则变化更新的要求,完成了浙江省90个县的数据质量检查控制。该方法优于检查规则与程序代码绑定的土地检查系统,实现业务与代码相分离,解决系统重用困难的同时提升了检查效率,更适用于未来的生产工作中。