Adaptive stochastic gradient boosting tree with composite criterion

ABSTRACT

In this paper, we propose an adaptive stochastic gradient boosting tree for classification studies with imbalanced data. The adjustment of cost-sensitivity and the predictive threshold are integrated together with a composite criterion into the original stochastic gradient boosting tree to deal with the issues of the imbalanced data structure. Numerical study shows that the proposed method can significantly enhance the classification accuracy for the minority class with only a small loss in the true negative rate for the majority class. We discuss the relation of the cost-sensitivity to the threshold manipulation using simulations. An illustrative example of the analysis of suboptimal health-state data in traditional Chinese medicine is discussed.     

论海德格尔技术观

海德格尔是20世纪德国著名的哲学家,作为后现代哲学思潮的先驱,海德格尔对技术进行了一系列深刻的本质探讨,而成为学界公认的对技术"存在论"进行追问和创新的哲学家,本文探讨了海德格尔的技术观,对其进行了梳理和评判。     

基于动物秉性的人生启示*

动物和人一样，也具有不同的秉性。以动物喻人，自古即有。从辩证的角度看，动物秉性自然有好的一面，也有坏的一面。这里我们借助动物思考人生，专门探讨动物秉性中一些好的品质，狗-无比忠诚；猪-难得糊涂；狼-勇敢合作的典范；牛-勤劳奉献精神；狐狸-聪明智慧的象征；龟-勤恳踏实的榜样。可见，动物的许多秉性亦给人生带来诸多的启示，值得人们以思考和学习。     

Education for the Group Worker's Reality: The Special Qualities and World View of Those Drawn to Work with Groups

SUMMARY

Within the social work profession, one's world view, one's beliefs and values based on one's experiences, strongly influences one's practice and comfort with groups. This paper will examine some of the different ways of viewing the world held by practitioners and students in relation to the likelihood that they will be able to work effectively with groups. Such examination, and the identification of the differences among social workers that results from it has implications for both teaching and supervision in social work. These implications will be discussed and specific principles and techniques for teaching social workers, in education and in supervision, based on their world views will be described. This paper aims to enrich education for group work so that the community of social group work practitioners can grow and continue to thrive.     

Modes of Practice and the Dual Mission of Social Work

Abstract

This study examines the commitment of social work in various countries to its declared dual missionenhancing individual well-being and promoting social justice. It does so by examining the mode of practice preferences of graduating BSW students from seven countries. Based on cluster analysis, three distinct subgroups of students with particular patterns of preferences were found: a generic group, a direct/micro group, and a macro group. The distribution of students among these groups differs between country cohorts. While each of the clusters was to be found in all the countries studied, in three country cohorts, a majority of students belonged to the generic group and a considerable number sought to engage in macro practice, reflecting a commitment to the profession's dual focus. The majority of the students within the remaining country cohorts preferred micro practice and were far less willing to adopt macro level practices.     

有效提高远程学习者自主学习的策略

本文通过对远程学习者自主学习的现状分析，提出相应的策略以帮助学员更有效地开展和提高远程自主学习。     

新世纪以来山药蛋派研究述评

新世纪以来,山药蛋派的研究整体而言,不是学术界的热点话题,但仍有一些有价值的学术成果出现。在流派研究方面,苏春生、席杨、傅书华、张恒等或对流派作全方位的评述,或提出卓有见地的观点。作家研究方面除赵树理外则更为贫乏,但段崇轩的马烽研究值得注意。着眼于将来,山药蛋派研究仍然有颇多言说空间。     

传承与裂变:马克思主义理论学习的拐点--以延安学习运动为中心的考察

延安学习运动建立了一套较为完整的学习内容体系,创建了行之有效的学习方法,建构了科学有效的学习机制,不仅提高了延安时期的革命干部之学习水平与能力,并为革命与战争取得胜利提供重要的智力支持,而且为今天的学习型政党建设创建可行的有益模式,因此,延安学习运动是中国共产党不断开展自身建设的重要拐点,具有重要的开拓与启迪之功效.     

The recruitment and selection of hospital medical consultants

Abstract

The literature on selection has been dominated in recent decades by the ‘prediction’ paradigm. Such an approach requires a substantial number of positions to be filled in order to compute validity coefficients. There are other approaches, using a different paradigm, when concentrated on adjusting the organization and the employee. Here careful analysis of job demands is essential. This article describes such an analysis, taking the medical consultant as an example. The method can be used in an iterative way. It is useful when one has to work with small numbers of positions.     

A note on approximate confidence limits for the negative binomial model

Four methods of approximating confidence limits for the single negative binomial parameter, P, are outlined and an empirical study is presented. Some remarks on prediction intervals are also included.