混合Kalman滤波器与Chamshift人脸跟踪算法的研究

文章通过Kalman滤波器预测由Camshift算法检测到的人脸窗1：7在下一帧图像可能出现的位置,进行下一帧图像的人脸跟踪．其中,Kalman滤波器的使用克服了单纯使用Cam-shift跟踪在遮挡或者丢失跟踪物体的不足,可以大大提高人脸跟踪的正确率．     

宁波教育学院2008届毕业生就业状况跟踪调查

了解毕业生的就业状况是高校毕业生就业工作中不可或缺的环节。为动态掌握毕业生的工作情况,了解毕业生对学校人才培养方面的意见和建议,有效推进和强化我校教育教学改革,做好我校毕业生就业指导工作,我们对本校2008届部分毕业生进行了跟踪调查。     

Is academic tracking related to gains in learning competence? Using propensity score matching and differential item change functioning analysis for better understanding of tracking implications

This study analyzes gains in cognitive components of learning competence with respect to cohorts based on ability tracking in a Czech longitudinal study. Propensity score matching is used to form parallelized samples of academic and non-academic track students and to eliminate the effect of selective school intake. We applied regression models on the total scores to test for the overall track effect. Furthermore, we analyze scores and gains on the subscores and check for differential item functioning in Grade 6 and in change to Grade 9. While after 3 years, no significant difference between the two tracks was apparent in the total learning competence score, we did, however, find significant differences in some subscores and in the functioning of some items. We argue that item-level analysis is important for deeper understanding of the tracking implications and may provide the basis for more precise evidence-based decisions regarding the tracking policy.     

高频串联谐振逆变器频率跟踪控制电路的仿真与应用

为了解决高频逆变电源负载参数变化引起固有谐振频率变化,导致逆变器效率降低及开关器件应力增加的问题,提出了一种以集成高速锁相环74HC4046为核心的、应用于功率MOSFET为主开关器件的高频串联谐振逆变电源的无相差频率跟踪控制系统,对电源的输出频率进行实时控制,并用Pspiee进行了仿真分析。结果证明,该系统具有较好的应用前景和推广价值。     

Teachers’ perspectives of lower secondary school students in streamed classes – A Western Australian case study

Streaming in secondary schools is not beneficial for improving student outcomes of education with vast amounts of educational research indicating that it does not improve academic results and increases inequity. Yet teachers often prefer working in streamed classes, and research shows that teachers mediate the effects of streaming on students. This study sought to add to the understanding of teachers’ role in student learning by investigating how teachers conceptualise the students in streamed classes. A qualitative case study approach was used, where 18 teachers were interviewed in-depth to create narrative examples, three of which are presented here. These narratives summarise the research findings that teachers saw students in high and low streams as having homogenous characteristics according to five dichotomous categories: approach to learning, attitude to learning, learning style, autonomy and background. Students in mixed-ability classes were viewed along these same continua, but as more heterogeneous groups. Furthermore, these views of students had direct implications for how teachers planned for learning and the expectations that they held of their students. The discussion links streaming research with teacher expectation research, suggesting that teachers of streamed classes in this secondary school hold specific whole-class ideas that affect student learning. The article concludes with recommendations for further inquiry that links these two important fields of educational research.     

Digital redesign tracker for cascaded analog systems with state saturation and external loads

This paper presents a newly developed digital redesign control scheme with a weighted switching strategy and output-reference tracking, for a cascaded analog system with state saturation and external loads. The proposed method improves the generally poor transition response and output deviation caused by state-saturation constraint and external loads. It replaces an existing or theoretically well-designed analog controller with state saturation, by a digital controller with almost identical performance.     

制度措施多管齐下 持续提高本科生源质量

本科生源质量的高低直接影响人才培养的质量和高校的办学水平,关系到高校的社会声誉、学科建设和事业发展。本文通过西安理工大学材料成型及控制工程专业在吸引优秀生源报考、提高生源质量方面开展的具体实践,提出了完善招生工作机制、强化招生宣传、建设优质生源基地、加强学科与专业建设以及强化学生学习过程的指导、跟踪和评估等确保与提高生源质量的具体举措。     

女贞子中发芽抑制物质化学成分的研究

女贞子是木樨科植物女贞(Ligustrum Lucidum Ait.)的果实。近年来,发现女贞子在农业生产上具有抑制种子萌发的作用。但关于女贞子中起抑制作用的主要有效成分,国内外尚未有报道,本研究利用活性追踪的方法,对女贞子中的水溶性物质进行了逐步地分离纯化,得到了一种白色粉末状化合物,通过物理常数测定、化学定性反应以及光谱测定(IR.UV.H~1 NMR),确定该化合物是女贞甙.研究表明:女贞子中含有多种抑制成分,而女贞甙是主要的抑制物质,它在2.5×10~(-3)mol或更高浓度时,在所观察的时间内。对小麦和白菜种子的萌发与生长产生明显的抑制作用。     

一种结合深度特征的人体运动序列追踪模型

目前主流的判别式目标跟踪模型大多使用灰度、颜色等手工特征,在目标快速移动或受到视频序列背景等因素干扰情况下,目标跟踪器可能在跟踪目标时学习到错误特征而导致跟踪失败。因此,提出一种结合深度特征的相关滤波跟踪算法。首先将待跟踪目标图像输入至卷积神经网络中,提取出较高层的卷积特征,然后将提取的卷积特征输入相关滤波器中得到响应,最后根据响应峰值得到追踪结果。以VOT2016中包含人体运动的视频序列为实验数据集,并分别与CN、SAMF及KPDCF模型进行对比。实验结果表明,结合深度特征的相关滤波算法具有较好的追踪性能,在不大幅降低追踪速度的情况下,提升了追踪精度和稳定性。     

CONTINUOUS ROBUST TRACKING CONTROLLERS FOR A CLASS OF UNCERTAIN NONLINEAR DYNAMICAL SYSTEMS

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