基于深度Q网络的水面无人艇路径规划算法

为实现水面无人艇(unmanned surface vessel, USV)在未知环境下的自主避障航行,提出一种基于深度Q网络的USV避障路径规划算法。该算法将深度学习应用到Q学习算法中,利用深度神经网络估计Q函数,有效解决传统Q学习算法在复杂水域环境的路径规划中容易产生维数灾难的问题。通过训练模型可有效地建立感知(输入)与决策(输出)之间的映射关系。依据此映射关系,USV在每个决策周期选择Q值最大的动作执行,从而能够成功避开障碍物并规划出最优路线。仿真结果表明,在迭代训练8 000次时,平均损失函数能够较好地收敛,这证明USV有效学习到了如何避开障碍物并规划出最优路线。该方法是一种不依赖模型的端到端路径规划算法。     

基于实用原则视角下的警察院校警务技能教学的改革与创新

本文运用文献综述法,对实用原则视角下的警察院校警务技能教学的改革意义进行阐述,对其相关的创新途径进行探讨,旨在于为提高学生的实战能力,促进其警务技能综合素质能力体系的构建与完善,进而在未来参与社会治安的实践活动中,能够切实履行警务人员的职责,发挥重要的作用,提供必要的借鉴与参考。     

关于大学人才培养问题的思考

以世界为背景回观大学历史我们发现,能引以大学自豪的东西难以胜数,但最可自豪的是大学经千年而不衰的持久并且日益旺盛的生命力。在人类的种种创造中没有任何东西比大学更经得起漫长     

论素质教育的基本原则及相互协调

素质教育的关键在于走出应试教育的单一模式。不同的教育原则之间不能相互孤立，相互割裂，而要相互补充，相互协调，素质教育应当提倡整体原则和全面原则的互补，动力原则和主体原则的互动，现实原则和发展原则的互渗。多极教育原则之间的互补，互动，互涌是走出单一模式的途径。     

高职院校图书馆自动化建设的探讨与思考

以笔者工作单位广东外语艺术职业学院图书馆为例，针对高职院校图书馆自动化建设方面存在的一些问题，探讨改进的措施和方法，并提出进一步发展的思路。     

基于小波包分解的白细胞胞核边缘提取算法与实现

白细胞胞核的形状是病理学家观察和检查白细胞样本的重要依据,是白细胞自动分类技术的关键.因为通过它可以区分白细胞的种类,所以白细胞胞核的边缘检测对临床标本的自动检测和分类具有重要意义.但是由于在成像过程中,常常混入随机噪声,这使得原始图像(把尺度空间中零尺度下的结果看作是原始图像)的边缘检测比较困难.小波分解是近年来较常用的方法,它以不同尺度下小波变换所获系数的局部极大值来确定图像的边缘.但是小波分解的方式固定,而正交小波包分解可以根据信号的特性灵活的选择分解方式,因而更加适合于图像的边缘检测.本文尝试利用正交小波包分解的方法实现白细胞胞核的提取并最终取得了比较好的效果.     

浅谈幼儿情绪智力的培养

现代社会 ,情绪智力比智力更能决定个人的发展。幼儿是情绪智力发展的关键时期 ,所以 ,学会培养幼儿的情绪智力对于每一位父母和教师都是十分重要的。本文论述了培养幼儿情绪智力的重要意义 ,并简要介绍了培养幼儿情绪智力的多种方法 ,对于促进幼儿心理健康发展具有重要意义。     

The use of generalizability theory to estimate data reliability in single‐subject observational research

Direct observation of behaviors is a data collection method customarily used in clinical and educational settings. Repeated measures and small samples are inherent characteristics of observational studies that pose challenges to the numerical estimation of reliability for observational data. In this article, we review some debates about the use of Generalizability Theory in estimating reliability of single‐subject observational data. We propose that it could be used but under a clearly stated set of conditions. The conceptualization of facets and object of measurement for a common design of observational research is elucidated under a different light. We provide two numerical examples to illustrate the ideas. Limitations of using Generalizability Theory to estimate reliability of observational data are discussed. © 2007 Wiley Periodicals, Inc. Psychol Schs 44: 433–439, 2007.     

Hydroxychavicol,a polyphenol from Piper betle leaf extract,induces cell cycle arrest and apoptosis in TP53-resistant HT-29 colon cancer cells

This study aims to elucidate the antiproliferative mechanism of hydroxychavicol(HC).Its effects on cell cycle,apoptosis,and the expression of c-Jun N-terminal kinase(JNK)and P38 mitogen-activated protein kinase(MAPK)in HT-29 colon cancer cells were investigated.HC was isolated from Piper betle leaf(PBL)and verified by high-performance liquid chromatography(HPLC),nuclear magnetic resonance(NMR),and gas chromatography-mass spectrometry(GC-MS).The cytotoxic effects of the standard drug 5-fluorouracil(5-FU),PBL water extract,and HC on HT-29 cells were measured after 24,48,and 72 h of treatment.Cell cycle and apoptosis modulation by 5-FU and HC treatments were investigated up to 30 h.Changes in phosphorylated JNK(pJNK)and P38(pP38)MAPK expression were observed up to 18 h.The half maximal inhibitory concentration(IC₅₀)values of HC(30μg/mL)and PBL water extract(380μg/mL)were achieved at 24 h,whereas the IC₅₀of 5-FU(50μmol/L)was obtained at 72 h.Cell cycle arrest at the G0/G1 phase in HC-treated cells was observed from12 h onwards.Higher apoptotic cell death in HC-treated cells compared to 5-FU-treated cells(P<0.05)was observed.High expression of pJNK and pP38 MAPK was observed at 12 h in HC-treated cells,but not in 5-FU-treated HT-29 cells(P<0.05).It is concluded that HC induces cell cycle arrest and apoptosis of HT-29 cells,with these actions possibly mediated by JNK and P38 MAPK.     

以元极图理论探讨幼儿音乐教育

元极图理论剖示了宇宙是自然和谐的巨系统，人是一小巨系统，人与天同构，同律，在人天相互关系中，音乐起桥梁作用，根据这一基本理论和幼儿的特点，探讨了在幼儿时期，音乐教育对人本性的开发，智慧增长，道德素质提高等具有重要作用。