基于迁移学习的家猪图像识别研究   总被引：1，自引：0，他引：1  

谢碧森  段清  刘俊晖  廖赟  张逸 《教育技术导刊》2020,19(7):36-40

为实现家猪图像识别并提高识别准确率,提出一种基于迁移学习的家猪图像识别方法。首先对现有数据集进行数据增强,然后迁移 VGG16 模型并对其进行微调,从而更好地提取图像特征并缩短网络训练时间。采用自归一化神经网络解决了梯度消失和梯度爆炸问题,在网络构造时使用全局平均池化代替全连接层,以达到降低模型过拟合的效果。实验对比结果表明,该方法分类效果较好,准确率达到了 84%,召回率和 F1 值分别提升至 0.8、0.82,各项指标相比基础模型均有所提升。  相似文献   

19世纪后期上海季节性移民的形成     

邵燕婷 《安庆师范学院学报(社会科学版)》2002,21(2):36-38

19世纪70年代至甲午战前,赴沪的江浙移民呈现出季节性流动的特点.他们多在农闲期奔赴上海谋生,又在农忙时返乡务农.这一季节性移民群体的形成存在着多方面的原因:一为城乡流动过程中制度基础的松动;二为江浙农民收入降低和农闲期的客观存在;三为上海城市经济以及职业的不稳定因素.在上述因素的综合作用下,19世纪后期的上海社会出现了季节性移民,这标志着上海乃至中国开始发生了人口流动的近代性转变,即农村人口向城市中心的转移.  相似文献   

西汉人口迁移对边疆经济开发的作用     

修云福 《伊犁教育学院学报》2004,17(3):19-21,29

一个地区的经济发展，要在一个先进的文化背景中，由掌握先进生产工具和生产技术的人来完成。西汉人口迁移对边疆经济开发不仅保证充足的劳动力，而且输入了先进的生产工具和生产技术，也促进边疆的经济文化的发展和社会的进步。  相似文献   

鸭绿江河口湿地鸟类观察   总被引：1，自引：0，他引：1  

Gao Ming 《丹东师专学报》1997,(1)

本文以详实的调查记录，提示了鸟类春秋迁徙的种群特征．旅鸟常集大群迁飞，晚走的夏候鸟则多单独活动；某些鸟类也常成对活动；集群大小与取食地大小、人类干扰程度有很大关系．  相似文献   

Finding Diego: A Bilingual Student Integrates School,Language, and Identity     

Robin L. Danzak  Louise C. Wilkinson 《Journal of Latinos & Education》2017,16(1):51-64

This article presents a mixed-methods case study of Diego, a bilingual teen who completed public school in Florida. During adolescence, Diego negotiated multiple identities: successful student, Mexican American, bilingual, and typical U.S. teenager. Diego provided interviews and bilingual (English/Spanish) writing (narrative/expository) in 2008 (at age 12, Grade 6) and in 2012 (at age 16, Grade 10). A qualitative analysis of his interviews and a quantitative linguistic analysis of his writing reveal central elements of Diego’s language development as related to academic English and identity. Educational implications for working with bilingual adolescents are discussed.  相似文献   

基于遗传算法的Spark中间结果数据迁移策略     

梁毅  陈金栋  苏超  毕临风 《教育技术导刊》2020,19(4):89-92

Spark是大数据内存计算系统的典型代表,通过内存缓存数据加速迭代型、交互型大数据应用的运行。基于时间窗口的数据分析是一类典型的大数据迭代型应用。基于Spark平台运行时间窗口数据分析应用,存在中间结果数据放置不均的问题,造成应用执行效率降低。针对上述问题,提出基于遗传算法的Spark中间结果数据迁移策略,通过考虑中间结果数据迁移时机、迁移数据规模,并使用遗传算法优化选取迁移数据放置位置,提高时间窗口应用执行效率。实验结果表明,在既有Spark平台中,采用该迁移策略可使时间窗口应用执行时间最大减少28.45%,平均减少21.59%。  相似文献   

Angry Anglos and aspirational Asians: everyday multiculturalism in the selective school system in Sydney     

Christina Ho 《Discourse: Studies in the Cultural Politics of Education》2019,40(4):514-529

ABSTRACT

‘Asian whiz kids’ perfect test scores.’ ‘Selective schools and tiger parents.’ These types of headlines highlight the increased visibility of academically successful students from Asian migrant backgrounds, in Australia and other Western countries. They also point to anxiety about the perceived aggressive ‘tiger’ parenting often associated with Asian academic success. This paper focuses on the forms of everyday multiculturalism found in and around high-performing selective schools and classes in Sydney, Australia, almost all of which are dominated by Asian-Australian students. Drawing on interviews with parents and students from Anglo- and Asian-Australian backgrounds, it documents the different positionalities adopted by participants within these culturally diverse settings, including anger, aspiration and cosmopolitanism. This potentially volatile combination of approaches to diversity reveals some of the social consequences of neoliberal migration and education policies.  相似文献   

From ‘brain drain’ to ‘brain bridging’: transnational higher education development and graduate employment in China     

Ka Ho Mok  Xiao Han 《Journal of Higher Education Policy & Management》2016,38(3):369-389

ABSTRACT

In the past few decades, the internationalisation of higher education has become an increasingly popular trend across different parts of the globe. The fierce global competition and the aggravating unemployment rate, coupled with low teaching and research quality revealed by universities in mainland China, have inevitably compelled a growing number of Chinese students, in particular the financially-able ones, to pursue higher education overseas or to enrol in transnational higher education offered in mainland China. Realising the severe problem of ‘brain drain’ and having a strong conviction to transform its higher education system to become more international for enhancing the global competitiveness of its higher education system, the Chinese government has made different attempts to enhance higher education quality by learning and incorporating new ideas and practices from overseas institutions, particularly encouraging the development of transnational higher education to change the higher education landscape. With particular reference to examining the way these students evaluate their future prospects in choosing different alternatives for further studies in higher education, this study sets out against the context briefly outlined above to critically analyse the motivation of students who choose to study abroad or enrol in Sino-foreign cooperation universities. This study also discusses the extent to which the internationalisation of higher education would affect the situations of ‘brain drain’ and graduate employment in China.  相似文献   

农村劳动力转移的国际考察与启示     

朱文蔚 《哈尔滨学院学报》2007,28(10):32-35

农村劳动力转移是人类社会发展的一个必然现象,英国、美国、韩国和日本等都曾出现过农村劳动力向城市和非农产业转移的现象。因此,考察其他国家的农业劳动力转移过程,从中吸取有益的经验和教训,将有助于我国农村劳动力转移的顺利完成,对我国"新农村建设"也具有重要意义。  相似文献   

试论唐前期人口重心北移及其影响     

张德美 《河北师范大学学报(哲学社会科学版)》2001,24(1):101-107

大量史实表明 ,由于唐前期政治、经济、文化诸因素影响 ,从全国范围来看 ,周边地区及南方人口日渐向北方黄河中下游地区集中 ,导致了唐前期全国人口分布重心北移的现象 ,并对唐代社会经济发展产生了深远的影响  相似文献