卡方自动交叉检验在人群细分中的应用

卡方自动交叉检验（CHi-squaredAutomaticInteractionDetector,CHAID）是一种定性的统计分类技术,主要解决根据一个因变量的不同反应确定若干预测变量的特征问题。这种算法模型可广泛应用于社会调查和市场细分中,根据不同的目的细分人群。该文主要介绍了CHAID算法模型的概念和发展,理论基础和应用过程,以及其效度检验方法,并将其与Logit模型等作了比较,指出其优势和局限。最后提出了研究展望     

Pedestrian detection using a moving camera: A novel framework for foreground detection

While background subtraction techniques have been widely applied to detect moving objects in a video stream captured by a static camera, detecting moving objects using a moving camera still represents a challenging task. In this context, pedestrian detection using a camera placed on the top of a vehicle’s windshield has been rarely investigated. This is mainly due to the background ego-motion. Since the scene captured by the camera seems in motion, it is very difficult to distinguish the moving pedestrians from the others that belong to the static part of the scene. For this reason, a compensation step is needed to suppress the ego-motion. This paper presents a study on the main challenges facing pedestrian detection systems as well as methods proposed to handle these challenges. A novel trajectory classification framework for detecting pedestrians even in challenging real-world environments is proposed. The proposed method models the background motion between two consecutive frames in order to compensate the camera motion. Then, it defines a classification process that differentiates between the background and the foreground in the frame. Using the defined foreground, we consequently identify the presence of pedestrians in the scene. The proposed method was validated on a public benchmark dataset: CVC-14 containing both visible and far infrared video sequences in day and night times. Experimental results confirm the effectiveness of the proposed approach in capturing the dynamic aspect between frames and therefore detecting the presence of pedestrians in the scene.     

Look-ahead content balancing method in variable-length computerized classification testing

Content balancing is one of the most important issues in computerized classification testing. To adapt to variable-length forms, special treatments are needed to successfully control content constraints without knowledge of test length during the test. To this end, we propose the notions of ‘look-ahead’ and ‘step size’ to adaptively control content constraints in each item selection step. The step size gives a prediction of the number of items to be selected at the current stage, that is, how far we will look ahead. Two look-ahead content balancing (LA-CB) methods, one with a constant step size and another with an adaptive step size, are proposed as feasible solutions to balancing content areas in variable-length computerized classification testing. The proposed LA-CB methods are compared with conventional item selection methods in variable-length tests and are examined with different classification methods. Simulation results show that, integrated with heuristic item selection methods, the proposed LA-CB methods result in fewer constraint violations and can maintain higher classification accuracy. In addition, the LA-CB method with an adaptive step size outperforms that with a constant step size in content management. Furthermore, the LA-CB methods generate higher test efficiency while using the sequential probability ratio test classification method.     

情境兴趣的研究进展

兴趣是一种重要的非智力因素,受到研究者的普遍关注。随着对兴趣的深入研究,研究者将兴趣分为个体兴趣和情境兴趣。其中,情境兴趣因其可被人为地控制和改变而成为国内外教育界的研究重点和热点。本文从情境兴趣的概念、分类、维度及影响因素等方面对情境兴趣的研究成果进行综述。     

不同维度特征的共存对归类不确定性特征推理的影响

探讨在归类不确定的情境下,目标特征和预测特征的共存对特征推理的影响。共包括了三个实验,其中实验1、2考察了非靶类别中目标特征和预测特征的共存性对特征推理的影响,实验3考察了靶类别中目标特征和预测特征的共存性对特征推理的影响。三个实验五个分实验的结果一致支持了修正后的Bayesian规则,排除了“单类说”、“综合条件概率模型”的假设,并进一步修正了Bayesian规则为：     

Meta-diagnosis: Towards a hermeneutical perspective in medicine with an emphasis on alcoholism

This essay argues that making a diagnosis in medicine is essentially a hermeneutic enterprise, one in which interpretation skills play a major part in understanding a disease. The clinical encounter is an event comprised of two voices; one is the voice of science which is grounded in empiricism, the other is that of human experience, which is grounded in story-telling and the interpretation of those stories.Using two voices, one from the Diagnostic and Statistical Manual of Mental Disorders-III-Revised, which describes alcohol abuse and alcohol dependence, and the other, that of Claire, a character in Edward Albee's play, A Delicate Balance, who is conversing with her brother-in-law, Tobias, I apply principles from Hans-Georg Gadamer's hermeneutics to the clinical diagnostic process. The essay will demonstrate that we overlook an enormous amount of information about alcoholism by an overreliance on objective data and that our hope for understanding alcoholics is in listening to their voices, and sharing the interpretation of their experiences with them.     

论医疗事故的法律责任

随着我国医疗卫生体制的改革、法制建设的发展,特别是新《刑法》的施行、《执业医师法》的颁布,关于医疗事故中医方行政、民事和刑事法律责任的法律规定正逐步健全。为了引起医方的高度重视、提高医疗质量、减少医疗事故的发生、有效地避免触犯法律,故对医疗事故概念的界定、构成、免责情形及三种具体法律责任作了较为系统的阐述。     

The changing face of police interrogation

This paper discusses some of the apparent changes in interrogations following the Police and Criminal Evidence Act 1984 and the introduction of tape recorders into police stations. These reforms are believed to have had several marked effects on interrogations. For example, the use of persuasive questioning is believed to have declined, as has the number of suspects making admissions. The evidence for these hypotheses is discussed. It is suggested that the apparent fall in confessions can be explained by methodological differences between studies and that the confession rate has in fact remained almost constant. Although there does appear to have been a change in the types of persuasive questioning employed during interrogations, it is difficult to establish whether or not the use of such questioning has declined. There is some evidence that persuasive questioning is now being carried out away from recording equipment.     

Intense classification training to increase the detection of drowning swimmers

Lifeguards engage in a continuous process of deciding whether swimmers are in danger or not. The variety of behaviours that distressed swimmers show makes it difficult to impart declarative knowledge to this effect during lifeguard training. As an alternative, we propose a novel training tool that requires novice participants to rapidly categorise 3-s video clips of real-life swimmers as either ‘safe’ or ‘drowning’. A control group also completed a sham intervention, with surfers that may ‘fall’. Due to the complex nature of swimming pools, a scaffolded training approach was employed, which gradually increased the amount of background information over subsequent training rounds. Results demonstrated that the drowning classification training improved responses in a subsequent drowning detection test, compared with the active control-group. The scaffolded approach appeared to prepare participants for processing swimmers in the drowning-detection test. The results provide a foundation for a novel training protocol to improve lifeguard skills.     

保护性价值观的结构和特征研究

保护性价值观是一种拒绝与其他任何价值相互交易,尤其拒绝与经济价值进行交易的观念。本文通过问卷调查和分析,将中国文化背景下的保护性价值观分为“有关自然环境和传统文化价值的保护性价值观”和“有关人伦人权和人际情感的保护性价值观”,并发现前者比后者更受重视和更有普遍性。研究还验证了保护性价值观具有的数量不敏感性、当事人相关性、道德责任感、拒绝、愤怒情绪、故作姿态这六个特征,并初步分析了两类保护性价值观在各特征上的差异。