Object detection based on visual memory: a feature learning and feature imagination process

ABSTRACT

Visual memory plays an important role for the human’s visual system to detect objects. The features of an object stored in the visual memory have much lower dimensions than the features contained within an image. We simulate the visual memory as a feature learning and feature imagination (FLFI) process to build an object detection algorithm. The method is constructed by a bottom-up feature learning and a top-down feature imagination. The proposed object detection method is tested using publicly available benchmark data sets, and the result indicates that it is fast and more robust.     

NOMINAL GDP TARGETING AND CENTRAL BANK CONSERVATIVENESS

In the literature on monetary economics, there is the ‘inflationary bias’ result which predicts that the rate of inflation will be biased towards a higher level under discretionary monetary policy than under a rule‐based policy regime. It is established that a credible nominal target can eliminate this ‘inflationary bias’. In this paper, we examine the case of nominal GDP targeting, which is a rule‐based monetary regime. Depending on the degree of conservativeness by the central bank, we show in a stylized model the choice of different combination of inflation and real GDP targets can still result in an ‘inflationary bias’, and there also exists the possibility of a ‘dis‐inflationary bias’.     

刺芪参胶囊的制备工艺研究

目的:探索刺芪参胶囊的制备工艺。方法:采用正交实验,以总皂苷质量为指标,优化提取工艺;采用单因素实验优化制剂工艺。结果:在最佳提取工艺条件下,刺芪参胶囊提取物中的总皂苷含量为12.19 mg·g-1;以糊精作为填充剂、硬脂酸镁为助流剂、95%乙醇为黏合剂制备胶囊剂。结论:刺芪参胶囊的制备工艺稳定可行。     

标志性政府运作型展览会对城市展览业发展的负面效应——以广交会为例

无论国内外,对事件影响研究均是热点课题之一,西方学者对事件社会影响关注较多,而国内较热衷于经济影响,其中又以正面效应居多。展览会是事件领域重要组成,而1957年在广州举办至今一年两届的广交会,属于典型的标志性政府运作型展览会。研究从经济视角,通过文献分析、深度访谈等方法,探讨了广交会对城市展览业发展的负面效应。结果显示:广交会通过利率实现及体系运作对广州展览业形成挤出效应,实际造成挤出效应的是后者;广交会从规模、展品及品牌三方面对其他展览会形成遮蔽效应;对城市展览业发展有重要影响的保障体系资源往广交会倾斜,造成虹吸效应。最后,构建了标志性政府运作型展览会对城市展览业发展的三重负面效应框架。     

废旧机电产品再循环模式研究

能否有效处理日益增加的废旧机电产品对我国经济的可持续发展有着重要的影响。文章从产品的角度提出基于循环经济的“3个循环”的概念，并在分析现有废旧机电产品循环模式的基础上提出第二循环模式，同时给出了相应的产品剩余寿命评价模型。     

Regime Shifts in a Dynamic Term Structure Model of U.S. Treasury Bond Yields

This article develops and empirically implements an arbitrage-free,dynamic term structure model with "priced" factor and regime-shiftrisks. The risk factors are assumed to follow a discrete-timeGaussian process, and regime shifts are governed by a discrete-timeMarkov process with state-dependent transition probabilities.This model gives closed-form solutions for zero-coupon bondprices, an analytic representation of the likelihood functionfor bond yields, and a natural decomposition of expected excessreturns to components corresponding to regime-shift and factorrisks. Using monthly data on U.S. Treasury zero-coupon bondyields, we show a critical role of priced, state-dependent regime-shiftrisks in capturing the time variations in expected excess returns,and document notable differences in the behaviors of the factorrisk component of the expected returns across high and low volatilityregimes. Additionally, the state dependence of the regime-switchingprobabilities is shown to capture an interesting asymmetry inthe cyclical behavior of interest rates. The shapes of the termstructure of volatility of bond yield changes are also verydifferent across regimes, with the well-known hump being largelya low-volatility regime phenomenon.     

探赜共享经济在中小城市的"寒流"之殇

共享经济作为移动互联网时代的新商业模式,是拉动我国经济社会发展的新动能和强引擎。但近些年来,共享经济在中小城市发展遭遇"寒流"、陷入瓶颈,主要原因在于:一是共享经济模式难以在中小城市发挥规模效应,甚至出现边际成本逆向递增;二是同质化的共享经济项目在中小城市盲目扩张,"羊群效应"引发市场产能过度投放;三是共享经济在中小城市迅速挤占传统经济市场份额,造成社会不稳定;四是共享经济盈利模式不适应中小城市商业生态和资本运作现实,导致资产泡沫。为破除共享经济发展的困境,带动共享经济走出"寒冬",推动共享经济实现平稳、可持续发展,提出如下建议:一是破除束缚共享经济发展的体制瓶颈,完善共享经济在中小城市运作机制;二是构建以中小城市消费者保护为核心的立体化共享经济监管运作体系,实施全方位监管;三是引导和支持共享经济企业基于消费者实际需求打造可持续的盈利模式,构建健康的生态系统;四是促进中小城市金融服务与共享经济的深度融合和平衡发展,缓解共享经济企业融资难题。     

我国三大经济区的区域化收益及其影响因素——基于城市经济效率的视角

经济区域化是目前我国城市经济发展的根本趋势,考察各类城市参与经济区域化的获益程度及其影响因素具有很强的现实意义。本文借鉴Byrnes和Storbeck(2000)的方法,基于城市经济效率的视角,考察了长三角、珠三角和京津冀地区的区域化收益水平,并基于Tobit模型对影响区域化收益的各种因素进行了计量分析。结果显示,我国三大经济区的区域化收益存在显著差异,京津冀地区的区域化收益最高,长三角地区次之,珠三角地区最低。进一步的计量分析发现,专业化分工和技术研发能力有利于区域化收益的实现,而外资的引进、政府的作用和城市空间影响则扩大了区域化收益,多样化分工和对外贸易对区域化收益的影响尚不明确,分地区的计量分析也基本上得出了同样的结论。加强区域内与区域间分工,是实现区域化收益和提升城市经济效率的根本途径。