一种经验模式分解下的海杂波小目标检测方法

利用海杂波有效探测海上小目标是目前雷达探测领域的热点问题，具有重要的应用价值。鉴于海杂波是一种非线性非平稳性的雷达回波信号，充分发挥整体平均经验模式分解的优势，将海杂波分解为若干个不同尺度的独立分量。通过研究发现有目标时，分解出的前5个分量与未分解前信号的相关系数明显减小，因此提出了一种新的海杂波背景下的目标检测方法。通过实测和模拟的海杂波数据进行训练和测试，研究结果表明，该方法能有效地实现海杂波下目标的探测，性能优于经典时域下、分数阶傅里叶变换域下以及平均经验模式分解后的广义Hurst指数的目标检测方法。     

装配式房建PC建筑的发展价值与发展方式

本文针对装配式房建PC建筑的发展价值与发展方式,采用理论结合实践的方法,先分析了目前我国装配式房建PC建筑的发展现状,接着探讨了发展装配式房建PC建筑的价值,最后探究了发展装配式房建PC建筑的方式。分析结果表明,装配式房建PC建筑是我国建筑史上的一次大变革,契合绿色、低碳、环保等新时代理念的要求,具有良好的发展价值。     

Natural resources,technological progress,and economic modernization

The present inquiry focuses on the modernization perspectives of the commodity‐exporting countries through the lens of development economics. To this end, the study adopts the Kaldorian framework to address the modernization effects, epitomized in the absorption of surplus labor. To trace the process of economic modernization, the study augments Lewis’s dualistic economy model by the extractive sector. Three different scenarios for the management of resource revenues are scrutinized. An altruistic mode, which implies a pure redistribution of the revenues among the poor swaths of the population, protracts the process of economic modernization, requires a greater amount of capital stock, and harbors a greater risk of a poverty trap. This effect is less pronounced if the modern sector is more capital‐intensive. A productive mode, which elicits full reinvestment of the commodity revenues, in contrast, accelerates the pace of economic modernization. Further, predicated on the scrutiny of a more realistic scenario, a bargaining mode, the study derives the condition for a net positive (or negative) modernization effect. The study identifies technical progress alongside capital accumulation as a further important source of economic modernization.     

“两网融合”背景下贸易经济专业人才培养模式探讨

本文总结梳理了“两网融合”复合型贸易经济专业人才培养的现状和新的要求,分析了“两网融合”复合型贸易经济专业人才培养的发展方向。从建立教学和科研复合型教学团队模式、信息化平台和实验室“多媒介”培养模式、“两网融合”平台全流程内部审计型人才培养模式、“课程思政+专业技能”结合教学模式等四个方面总结模式创新的基本途径。     

传统媒体的转型与融媒生态圈构建研究——以杭州二更网络科技有限公司为例

当前融媒体的发展已成为一股不可逆转的潮流。传统媒体的转型需要媒体行业整合自身优势,从资源、内容、宣传、价值等方面入手,对生产运营进行改革,重建媒体与用户之间、新媒体与传统媒体之间的“链条”。论文以杭州二更网络科技有限公司为例,具体阐述了“二更”的传统媒体转型,将新媒体融入“二更”文化,打造属于“二更”的融媒体生态圈。     

Do satisfying walking and cycling trips result in more future trips with active travel modes? An exploratory study

Previous studies have indicated that travel satisfaction - the experienced emotions during, and cognitive evaluation of, a trip - can be affected by travel mode choice and other trip characteristics. However, as satisfactory trips might improve a person's attitude towards the used mode, persons may be more likely to use that same mode for future trips of the same kind. Hence, a cyclical process between travel mode choice and travel satisfaction might occur. In this paper we begin to analyse this process—using a structural equation modelling approach on cross-sectional data—for people who engage in walking and cycling for leisure trips in the Belgian city of Ghent. The focus on walking and cycling reflects recent studies indicating that active travel is often associated with the highest levels of travel satisfaction. Results of this exploratory analysis offer tentative support for the idea of a cyclical process: the evaluation of walking and cycling trips positively affects the respondents' attitude towards the respective mode, which in turn has a positive effect on choosing that mode.     

基于PPP模式工程项目融资风险管理的思考

近年来,我国的经济发展较为迅猛,呈现出繁荣的景象。在此基础上,推动项目融资风险管理的出现与成长,而PPP模式较为突出,不同于暗含经济风险的传统型风险管理,能够在一定程度上助力政府财政支出压力的降低。但是需要多加关注的是,PPP模式的工程项目融资本身就具备一定的风险因素。为此,论文着眼于实际情况,充分考虑其基本特点,提出行之有效的防患策略,为我国顺利推进PPP模式工程项目管理工作提供一定的借鉴意义。     

新零售下社区生鲜配送模式的综合评价

新零售模式下社区生鲜“最后500m”的冲刺已成为生鲜农产品快速配送的关键问题。基于目前已有的配送模式:“社区+便利店”模式、第三方配送以及众包模式,通过层次分析法从服务水平、配送成本、客户体验三个方面对三种配送模式进行量化分析,得出每种配送模式在各层次的权重。研究结果表明配送中降低配送成本是关键,减少货物赔损率、提高客户满意度才能实现有效率的配送。