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排序方式: 共有292条查询结果,搜索用时 15 毫秒
81.
Support vector machines regression (SVMR) is an important tool in many machine learning applications. In this paper, we focus on the theoretical understanding of SVMR based on the insensitive loss. For fixed ??≥?0 and general data generating distributions, we show that the minimizer of the expected risk for insensitive loss used in SVMR is a set-valued function called conditional median. We then establish a calibration inequality of insensitive loss under a noise condition on the conditional distributions. This inequality also ensures us to present a nontrivial variance-expectation bound for insensitive loss, and which is known to be important in statistical analysis of the regularized learning algorithms. With the help of the calibration inequality and variance-expectation bound, we finally derive an explicit learning rate for SVMR in some space. 相似文献
82.
国产芸香科九里香属化学分类 总被引:1,自引:0,他引:1
九里香是芸香科的一个小属,主要分布于我国南部及中南半岛,少数个别品种向西南
延伸至印度和斯里兰卡及向东南伸展至澳洲东北部。 我国境内共有8种和1亚种。 九里香
属植物含丰富的生物碱和香豆精,其中包括不少生物活性成分,民间亦每每选用该属植物作传
统草药。最近又从千里香的根部分离得一种新的双吲哚生物碱,命名为月橘烯碱; 该成分有强
效的抗着床活性,对计划生育有重大意义。在发掘月橘烯碱的自然资源的研究过程中,作者分
析了国产的8种九里香属植物,发现该属植物可以划分为两组,即九里香组和棕茎组。九里香
组之成员跟棕茎组的在形态上有明显分别,而且前者之根部含抗着床成分月橘烯碱和8-戊烯
化香豆精,但后者之根部则含咔巴唑生物碱。初步分析了澳洲的卵叶九里香和泰国的暹罗九 里香,其形态及化学成分亦支持将该属分为两组。作者据此发表新组合。 相似文献
83.
Chi‐hung Clarence Ng 《教育心理学》2008,28(4):439-456
The hypothesis in this study was that different types of multiple‐goal learners would have different patterns of learning. A sample of 797 adult distance learners enrolled in different programs offered by a distance learning university in Hong Kong completed a questionnaire assessing their goals, use of strategies, motivational beliefs, and attitudes towards the course they were doing. Two‐stage cluster analyses found a group of single‐goal learners (mastery focused) and three groups of multiple‐goal learners with different focuses in their goal profiles: performance focus, work focus, and multiple focuses. These four clusters of learners differed in terms of use of learning strategies, regulatory strategies, motivational beliefs, and attitudes towards the course. Learners focusing on work‐related goals or performance goals achieved better examination results than did those focusing on multiple goals or solely on mastery goals. 相似文献
84.
85.
86.
Gender earnings differentials in China during the course of development in the post-reform period were examined. The analysis showed that the female–male earnings ratio increased over time in all regions. The region with relatively rapid economic reforms had the highest female–male earnings ratio. Decomposition of the gender earnings differential revealed that in the more developed region a lower percentage of the differential could be explained by gender differences in productive characteristics. Changes in the discriminatory component of the differential by region over time suggested that both the “competition” effect proposed by Becker [The Economics of Discrimination, 1971] and the effects of wage decentralization during economic reforms played a different role in the eastern and central regions versus their role in the western region. Further examination of the sub-components of the explained component of the differential highlighted the minor role of education in explaining the gender earnings differentials. 相似文献
87.
David Kember Richard Armour Winnie Jenkins Doris Y. P. Leung Natalia Li Kwok Chi Ng 《高等教育研究与发展》2001,20(3):265-280
This article develops a classification system for the orientations to enrolment of part-time students based upon their practical lifelong learning needs. Orientation to enrolment is seen as a complex construct embodying all the reasons, purposes, expectations and motivations that cause students to pick a particular course and elect to study by the part-time mode. Virtually all of the interviewed students had a vocational orientation so some previously used categorisation schemes were not suitable. Instead seven categories relating to lifelong learning needs provided a scheme which covered the cases and related well to explanations given by interviewees for enrolling in the courses. These were re-training or further development for those who need to make a career shift; education for professionals who need to undertake continuing professional development through their careers; an opportunity for a tertiary education for those who did not previously have the chance; an education at the tertiary level for those who did not do sufficiently well at school to qualify for direct entry to university; an alternative to mainstream education; education for adults; and learning for pleasure throughout the lifetime. 相似文献
88.
Kenneth K. Poon Zijia Ng Meng Ee Wong Sarinajit Kaur 《Asia Pacific Journal of Education》2016,36(1):84-97
In this study, we sought to examine the perceptions of teachers and other school professionals towards the inclusion of secondary school students with special educational needs (SEN), and the associated factors. The Sentiments, Attitudes and Concerns about Inclusive Education Revised scale (SACIE-R) was completed by 131 teachers and school professionals from two mainstream secondary schools in Singapore. The findings revealed an overall neutral attitude towards inclusion. Together, confidence in teaching students with SEN, the level of training SEN support, as well as experience teaching students with SEN account for a large proportion of the variance in ratings of inclusive perceptions. Further analyses revealed that confidence in teaching or supporting students with SEN was found to be a significant predictor of inclusive perceptions. The findings suggest that schools seeking to engage in inclusive practices should focus on ways to develop the confidence of personnel to support students with SEN. Professional development and mentorship were suggested as possible avenues. 相似文献
89.
Shonfeld Miri Cotnam-Kappel Megan Judge Miriam Ng Carolyn Yeehan Ntebutse Jean Gabin Williamson-Leadley Sandra Yildiz Melda N. 《Educational technology research and development : ETR & D》2021,69(4):2151-2170
Educational technology research and development - This article presents a conceptual model of cross-cultural alignments in education in the digital era. The intention was to explore and respond to... 相似文献
90.
Kok-Mun Ng Chuang Wang Carlos P. Zalaquett Nancy Bodenhorn 《International journal for the advancement of counseling》2007,29(3-4):173-185
There is the need for a reliable and valid measure to facilitate emotional intelligence (EI) research on international college
students (ICSs). The present study examined the factorial invariance of the Wong and Law Emotional Intelligence Scale (WLEIS),
a trait EI measure, in a sample of 628 ICSs. A web-based survey was developed to facilitate data collection across the country.
Results of a confirmatory factor analysis support the factorial invariance of the WLEIS in ICSs. Reliabilities and scale correlations
further supported the psychometric properties of the measure for international students. Additional findings indicate possible
country-of-origin difference on trait EI among different national groups.
An erratum to this article can be found at 相似文献