基金管理者报酬的线性模型研究与实证分析

探讨了四种跟踪组合回报率与目标回报率间偏差的线性模型 ,线性偏差比传统的二次型偏差更能准确描述投资者的风险态度 ,用线性规划给出了明确的优化方案 ,并对上海证券 A股各分类资产组合作出了实证分析和比较 ,得出为达不同的投资目标投资者确定投资组合及基金管理者报酬的各种优化模型 .     

中国指数基金投资风险研究

以我国的指数基金为研究对象,对其投资风险进行全面评估.对样本指数基金的跟踪误差方差进行分解,分析其历史风险水平及其风险构成.引入压力测试的方法,分析并预测样本指数基金未来的风险水平.实证结果表明,从总体上看,样本指数基金的风险控制得较好,基本满足指数化投资的要求.     

提升博士生原始创新能力的探索与实践

提升博士生的原始创新能力是构建新的基础研究工作模式的关键.研究发现,各国博士学位论文基本分为原始创新型和跟踪型两个类型.分析中一项关键量化指标是原始创新型论文在所研究的博士学位论文样本中所占的比例.以笔者所在研究组的部分博士论文为样本,通过比较研究发现,采用原始创新培养模式可将此指标由20世纪末的3.45%提升到目前的28.57%.     

Limiting labels: Opportunities to learn and college readiness among English language learners

Over a fifth of California's public schools' students have limited access to college and career pathways due to being labeled an “English-language learner (ELLs).” As reported by the California Department of Education, in the 2017–2018 school year, of the over 6.2 million students in California, nearly 1.3 million students are categorized as ELLs. The ELL label states students “whose difficulties in speaking, reading, writing, or understanding English may (my emphasis) limit his or her ability to (1) achieve in classrooms where English is the language of instruction and (2) access opportunities to fully participate in society.” Aligned with deficit thinking models, the US school system interprets “may” as “will” and makes decisions that negatively impact a large body of students across the country. The growing body of research reveals that many with the ELL label have been and continue to be intentionally underserved, limited access to postsecondary education, tracked into low-rigor and stigmatizing course pathways, and are deliberately unsupported to become college-ready, furthering the inequities in education and limiting options for quality k-12 educational experiences. The system becomes blinded by the label and ignores students with ELL labels' abilities and capacities to learn. So how are students with ELL labels supposed to become college-ready, let alone career-ready? For the purposes of this critical literature review, I will focus on exploring the existing structures that define “college-readiness” and the disparities created by the intentional tracking of students with the ELL label in comparison to their non-ELL peers.     

School tracking and its role in social reproduction: reinforcing educational inheritance and the direct effects of social origin

The degree of social reproduction varies considerably between industrialized countries, raising the question of which institutional regulations promote or restrict this process. Education is considered the main mediator of social reproduction. Because school tracking – the sorting of children according to ability and interest at different ages – is known to affect educational attainment and the degree of tracking varies strongly across countries, it may thus account for differences in social reproduction. However, empirical studies are scarce, and the total impact of tracking on social reproduction remains ambiguous. Using the European Social Survey (ESS) 2012 and 2014 from 24 countries, we demonstrate that school tracking is strongly associated with higher degrees of social reproduction. Decomposing the process of social reproduction into educational inheritance, educational returns and direct effects of social origin, we find that although all channels contribute to social reproduction, the impact of tracking seems to be exerted through educational inheritance and to a similar degree through direct effects of social origin, whereas educational returns do not seem to be affected. Even net of educational attainment, social origin thus has a stronger effect on social status in tracked systems. We ascribe this effect to differences in qualitative choices within educational tracks, such as fields of study.     

基于卡尔曼滤波的运动员实时跟踪系统研究

应用计算机技术,并采用预处理算法和跟踪算法可建立基于卡尔曼滤波的运动员实时跟踪系统,用于实时分割、跟踪球场中运动着的运动员,得到其在运动场景中的各项运动参数,并进行技战术统计和分析,为教练员和运动员制定正确的运动技术方案提供决策依据。     

一种太阳方位跟踪器控制系统的设计

通过分析太阳运行规律,设计了太阳位置传感器.采用两级传感器方式,实时检测太阳方位.利用简单光敏电阻和SPCE061A单片机设计了一种多方向太阳能收集控制系统,实现了大范围高精度地跟踪太阳.经试验,系统的高度角和方位角跟踪范围在0～180°和0～270°,跟踪精度达到1°.     

netfilter技术分析及在入侵响应中的应用

从netfilter总体结构入手,分析了netfilter的连线跟踪、包过滤、地址转换、包处理等关键技术。在此基础上,研究了入侵响应策略,提出了基于netfilter的主动响应模型。经测试证明,这种主动响应模型灵活高效,可以极大地增强系统对入侵行为的防御能力。     

一种新的单站被动跟踪方案

在被动跟踪系统中,只利用测向技术不能快速、高精度地跟踪目标,此外使用传统的EKF算法进行跟踪滤波,得到的误差较大,容易产生发散现象。该文提出利用相位变化率和SR-UKF算法相结合的方案,有效克服了上述问题,大大提高了跟踪的速度和精度,滤波器的稳定性也得到增强,跟踪性能得到提高,其有效性通过仿真得到了证明。     

滑坡多点监测数据综合信息的提取方法

讨论了集中式和有无反馈的分布式结构的融合算法,提出了应用多传感器目标跟踪融合技术来处理滑坡预报中多点监测问题,解决了传统滑坡预报中只能利用一个关键监测点进行预报的不足。通过实例仿真,表明该方法具有有效性和可行性。