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.     

年轻高管与企业股价崩盘风险：来自“代理冲突观”的证据*

在企业纷纷实施高管年轻化战略的背景下,本文从股价崩盘风险的视角分析和检验了年轻高管风险偏好的经济后果及其作用机理。本文基于“个体认知观”和“代理冲突观”展开理论推演,采用中国沪深A股非金融上市公司的数据,检验发现,年轻高管会显著加剧企业未来的股价崩盘风险,且这种影响主要存在于民营企业,在国有企业并不显著。进一步针对具体作用机制的检验发现,年轻高管在投资决策中选择了更多能迅速提升个人收益的风险性投资项目,但在不能迅速提升个人收益的风险性投资项目上与年长高管没有显著差异。同时,年轻高管对股价崩盘风险的加剧效应仅仅存在于高管在上市公司领取薪酬的样本企业,且更高的独立董事比例能显著抑制年轻高管的股价崩盘风险加剧效应。这表明,年轻高管个体认知层面的风险偏好被其追求个人私利最大化的代理冲突所扭曲,进而为年轻高管风险偏好的“代理冲突观”提供了实证证据。     

产学研合作创新绩效影响因素元分析研究

为探寻中国产学研合作创新绩效影响因素,挖掘促进中国产学研深度融合的发力点,运用元分析方法,对中国国内与产学研合作创新绩效影响因素相关文献进行再分析,结果发现：①企业层面的企业规模、企业知识吸收能力、企业研发人员投入与企业研发经费投入,组织间层面的知识协同性、知识转移能力、信息沟通渠道及合作紧密度,政府层面的政策支持与经费支持,区域层面的法律法规完善性与经济发展水平均能够显著提升产学研合作创新绩效;②区位因素、数据类型分别对产学研合作创新绩效与企业规模、政府经费资助关系具有显著调节作用。     

价值链视角下科技人才分布对区域创新系统效率的影响

科技人才作为科技创新的主体,是区域创新系统的重要投入,其省际分布状况潜在影响着各区域创新效率。基于2009-2016年我国内地30个省级区域科技人才与研发面板数据,在创新价值链分解的基础上,分别考察科技人才数量与结构维度对区域创新系统三阶段效率的影响。结果发现：在数量维度下,科技人才分布规模对区域知识创新效率、专利创新效率有非线性倒U型影响,先后从人才聚集规模经济效应转向不经济效应;整体集中度提高即全国科技人才分布相对集中有助于提升各地区专利创新与产品创新效率;在结构维度下,科技人才队伍中女性与博士研发人员越来越高的比重对知识创新效率表现为负向影响作用。最后,结合新旧动能转换背景,提出积极发挥人才集聚正向效应的建议。inno[]rlzb[]rlzb[]czpz[]czpz[]cyjg[]cyjg[]dwkf[]dwkf〖BHDG1*3,WK7*3ZQ,WK6。9DWW〗     

Cost-effectiveness analysis of ramucirumab treatment for patients with hepatocellular carcinoma who progressed on sorafenib with α-fetoprotein concentrations of at least 400 ng/ml

Abstract

Objective: This study aimed to compare the cost-effectiveness of ramucirumab versus placebo for patients with hepatocellular carcinoma who progressed on sorafenib with α-fetoprotein concentrations (AFP) of at least 400?ng/ml in the United States.

Methods: A Markov model was constructed to assess the cost-effectiveness of ramucirumab. Health outcomes were measured as quality-adjusted life years (QALYs). With TreeAge software, the disease process was modeled as three health states: progression-free survival (PFS), progressive disease (PD), and death. Costs were extracted from the REACH-2 trial, and utility was derived from published literature. Incremental cost-effectiveness ratios (ICERs) were calculated to compare ramucirumab with placebo. Probabilistic sensitivity analyses were developed to examine the robustness of the results.

Results: In the base case analysis, ramucirumab therapy had a cost of $55,508.41 and generated 0.54 QALYs, while placebo therapy had a cost of $761.09 and generated 0.47 QALYs, leading to an additional $54,747.32 in costs and 0.07 QALYs. The ICER was $782,104.57 per QALY, which was much higher than the willingness-to-pay threshold of $100,000 per QALY. According to sensitivity analyses, the utility of PD in the two groups was the dominant parameter influencing the ICER.

Conclusion: Although ramucirumab was associated with prolonged survival for patients with advanced hepatocellular carcinoma who progressed on sorafenib treatment with an AFP of at least 400?ng/ml, it is not a cost-effective treatment from a United States payer perspective.     

智慧街道 从服务开始

未来的＂智慧街道＂是一个微型的智慧城市,是城市信息化的更高级版本。     

准市政债券的形成机理、运行与发展

在中国债券市场上,债券品种的结构性缺陷导致“准市政债券”现象日益引人关注。在归纳准市政债券运行特征的基础上,详细剖析了其形成机理和潜在风险,并把其认定为我国当前经济环境下特有的金融产品。关于准市政债券的未来发展方向,建议通过基础设施融资体制的改革来带动准市政债券的改革,而非本末倒置。     

宠物产业竞争的博弈论分析

宠物产业概论 宠物在我国有着悠久的历史，在《史记》中就有秦代宫廷养犬的记载。在过去，饲养宠物是达官显贵的专利，普通老百姓只能养一些土狗、土猫，其作用主要是看家护院和捕捉老鼠。把狗猫当宠物来饲养，对老百姓来讲是可望不可及的事。随着人民生活水平的日益提高，宠物也越来越多的进入寻常百姓家。     

浅谈经济分析在企业创新中的应用

本文把企业作为一个完整的系统进行分析,论述了可持续发展与企业创新、经济人理性有限假定与企业创新之间的内在关系,指出企业要实现永续经营的至上目的,必须通过建立企业创新体系来实现持续、系统、全方位的创新活动,保持企业这个有机体的活力。