盆底结构MRI研究进展及思考

盆底结构精细复杂,传统的解剖学以尸检为依据,现代影像学则提供了活体观察功能形态的有效方法.盆底结构核磁共振成像研究的新进展,体现了医学技术创新的稳健性、后发性、综合性,其发展取决于现代科学技术的进步.因此影像医学工作者作为医学科技主体,只有具备综合型知识结构,才能更好地进行医学技术创新.     

MAKING DECISIONS FROM AN INTERVIEW: EXPERT MEASUREMENT AND MECHANICAL COMBINATION

One way of making decisions on the basis of qualitative impressions is to identify a number of relevant dimensions, translate the impressions into quantitative ratings on each of the dimensions, and integrate the ratings using a mechanical combination scheme. The paper compares the output of this method to global (clinical) judgment. The basis for the comparison is a large database that includes both information collected in a structured interview and a relevant criterion. The results clearly suggest that mechanical combination outperforms clinical judgment, but also that the combination of both schemes produces the highest accuracy.     

Greenwald提出的内隐联想测验介绍

内隐联想测验(Implicit Association Test,简称IAT)是Greenwald等于1998年提出的一种新的内隐社会认知的研究方法,其采用的是一种计算机化的辨别分类任务,以反应时为指标,通过对概念词和属性词之间的自动化联系的评估进而来对个体的内隐态度等进行间接测量。该文先对内隐联想测验的由来、原理进行了介绍,再从性能及应用两方面对已有的相关研究进行了归纳、整理和论述。最后,通过分析指出该方法符合现代心理测量学的最新发展方向,将有着强大的生命力。     

Three-Mode Factor Analysis Of Parker-Fleishman Complex Tracking Behavior Data

A combination method of analysis utilizing Tucker's generalized learning curves and three-mode factor analysis is tried out on intercorrelations published by Parker and Fleishman of several measures of performance at several stages of practice on a complex tracking task. The results indicated two measure factors, directional control and sideslip control; four stages of practice factors, very early, middle early, middle late, and very late; and seven factors of individual differences corresponding to combinations of measures and stages of practice factors. The results were clear so that the combination method of analysis has promise for indicating the structure of relations in similar data.     

Combining probability values from independent permutation tests: a discrete analog of Fisher's classical method

Permutation tests are based on all possible arrangements of observed data sets. Consequently, such tests yield exact probability values obtained from discrete probability distributions. An exact nondirectional method to combine independent probability values that obey discrete probability distributions is introduced. The exact method is the discrete analog to Fisher's classical method for combining probability values from independent continuous probability distributions. If the combination of probability values includes even one probability value that obeys a sparse discrete probability distribution, then Fisher's classical method may be grossly inadequate.     

反应风格的测量与统计控制

反应风格是共同方法偏差的主要来源之一。本文首先讨论反应风格的定义和类型,梳理其危害,认为反应风格能使测验分数出现偏差,影响测验信效度分析和变量关系分析,有必要控制其危害。然后介绍了常用的反应风格测量方法,包括计数法和模型法两大类,对测量方法的选择给出了建议,在此基础上,就如何结合反应风格的测量方法与残差回归法、偏相关法来控制反应风格危害给出建议。     

反应风格的测量与统计控制

反应风格是共同方法偏差的主要来源之一。本文首先讨论反应风格的定义和类型,梳理其危害,认为反应风格能使测验分数出现偏差,影响测验信效度分析和变量关系分析,有必要控制其危害。然后介绍了常用的反应风格测量方法,包括计数法和模型法两大类,对测量方法的选择给出了建议,在此基础上,就如何结合反应风格的测量方法与残差回归法、偏相关法来控制反应风格危害给出建议。     

Psychotherapie oder Psychopharmakotherapie oder Kombinationstherapie?

Current meta-analyses convincingly show the effectiveness of psychotherapy. For many mental disorders psychotherapy is the therapy of choice and superior to an exclusive pharmacotherapy. A psychotherapy is still effective far beyond the end of psychotherapy. Mild and moderate depressive episodes can be successfully treated by psychotherapy alone. A combination treatment is indicated for severe depressive episodes and a chronic course. Cognitive behavior therapy (CBT) is the method of choice for anxiety disorders where CBT can be initiated in order to build up self-efficacy and medication can be omitted at first. A combination treatment is only indicated when the response is insufficient. For obsessive-compulsive disorder with predominantly compulsive behavior CBT with exposure and reaction management is the method of choice. Combination treatment is indicated particularly for predominantly obsessive thoughts and comorbid depression. In posttraumatic stress disorder a trauma-focussed CBT is the method of choice. For posttraumatic stress disorder selective serotonin reuptake inhibitors are indicated only for comorbid disorders. For all disorders benzodiazepines should be prescribed only in justifiable exceptional cases for short-term administration. For individualized differential indications the effects of simultaneous psychopharmacotherapy on the therapeutic process must be taken into consideration.     

On linear combinations of binary item scores

A method is given for finding a linear combination of binary item scores that minimizes the expected frequency of misclassification, in discriminating between two groups. The item scores are not assumed to be stochastically independent. The method uses the theory of threshold functions, developed by electrical engineers. Since psychometricians may not be familiar with this theory an elementary introduction to the required material is also given.     

口腔治疗中心理干预配合无痛麻醉的体会

为了评价心理干预配合无痛麻醉技术的临床效果,寻求一种更有利于减轻患者恐惧心理的技术方法,将80例急性牙髓炎患者随机分为两组,实验组为心理干预配合无痛麻醉镇痛的患者,对照组为注射利多卡因局部麻醉镇痛的患者。观察两组在牙髓治疗中患者的恐惧程度与治疗效果。结果显示,心理干预配合无痛麻醉的实验组与注射利多卡因的对照组比较有显著差异（P〈0．05）．实验组患者的恐惧程度明显比对照组低。提示心理干预配合无痛麻醉可以明显减轻患者对治疗的恐惧感,值得在临床治疗中推广应用。     

Comment on Levine's blank trial method: A procedure for estimating true hypothesis behavior

When Levine's method of blank trial probes is used to study hypothesis behavior the probability that a probe results in a cue-defined choice combination usually lies between .70 and .90, depending upon the age group and the treatment conditions. It may not be safe to assume that each such combination signifies an hypothesis. A procedure for estimating the probability of true hypothesis behavior is presented, including a validity test for the resulting estimate. The procedure is applied to data taken from three research reports, and reveals substantial differences between age and treatment groups. Implications of the procedure for correctly interpreting empirical results are discussed.     

Examining differential item functioning due to item difficulty and alternative attractiveness

A method for analyzing test item responses is proposed to examine differential item functioning (DIF) in multiple-choice items through a combination of the usual notion of DIF, for correct/incorrect responses and information about DIF contained in each of the alternatives. The proposed method uses incomplete latent class models to examine whether DIF is caused by the attractiveness of the alternatives, difficulty of the item, or both. DIF with respect to either known or unknown subgroups can be tested by a likelihood ratio test that is asymptotically distributed as a chi-square random variable.     

Bootstrapping the estimated latent distribution of the two‐parameter latent trait model

This paper focuses on the two‐parameter latent trait model for binary data. Although the prior distribution of the latent variable is usually assumed to be a standard normal distribution, that prior distribution can be estimated from the data as a discrete distribution using a combination of EM algorithms and other optimization methods. We assess with what precision we can estimate the prior from the data, using simulations and bootstrapping. A novel calibration method is given to check that near optimality is achieved for the bootstrap estimates. We find that there is sufficient information on the prior distribution to be informative, and that the bootstrap method is reliable. We illustrate the bootstrap method for two sets of real data.     

外科临床决策的核心在精于选择

造就名医是个系统工程,理论和实践统一才有功底。为病人提供优质服务,要求医生有能力对病情进行综合分析思考、辨认、评估,对诊断、治疗进行鉴别,为选择科学的临床决策提供依据。理论与临床实践高水平的结合,难能可贵的是忌粗取精、忌浅求深、忌表识里,从临床汇集资料来思考、分析,最终做出选择,再到临床上去验证,从而得出正确的诊断和处理方案。善于选择和精于选择,是临床决策的核心,是临床医生综合素质走向成熟的产物,是一代名医成长的必然之路。     

Generalized canonical correlation analysis of matrices with missing rows: a simulation study

A method is presented for generalized canonical correlation analysis of two or more matrices with missing rows. The method is a combination of Carroll’s (1968) method and the missing data approach of the OVERALS technique (Van der Burg, 1988). In a simulation study we assess the performance of the method and compare it to an existing procedure called GENCOM, proposed by Green and Carroll (1988). We find that the proposed method outperforms the GENCOM algorithm both with respect to model fit and recovery of the true structure. The research of Michel van de Velden was partly funded through EU Grant HPMF-CT-2000-00664. The authors would like to thank the associate editor and three anonymous referees for their constructive comments and suggestions that led to a considerable improvement of the paper.     

A simple device for producing synchronous and asynchronous binocular flicker

Many studies on binocular integration have compared in-phase and out-of-phase flicker stimulation. A new method of producing such stimulation is described. It differs from previous designs in that a combination of polarizers is used rather than mechanical light choppers or electronic flashers. The arrangement produces sinusoidal luminance pulses that can be presented with any degree of asynchrony between the two eyes.     

Combining predictors for multi-layer architecture of adaptive fuzzy inference system

To solve problems with a Sugeno adaptive fuzzy neural network using training data, it is necessary to select the appropriate combination of input characteristics of the sub-adaptive neuro-fuzzy inference system (ANFIS) and to determine the appropriate topology. The multi-layer architecture of a sub-ANFIS (MLA-ANFIS) is a good model for prediction problems and solves them modularity. Since, the combination of several predictors is the current focus in the construction of hybrid intelligent systems; we created many solutions to combine machine learning methods, namely ANFIS, support vector machine (SVM), deep neural network (DNN), naive Bayes (NB), linear regression (LR), extreme learning machine (ELM), and decision tree (DT) mixed predictors, and ensemble bootstrap aggregation based on MLA-ANFIS in order to discover the optimal model of combined predictors based on the MLA-ANFIS with a combination of input features entered in the MLA-ANFIS. We implemented our approaches on 365-day concrete compressive strength, thoracic surgery, fertility diagnosis, breast, energy, and glass identification datasets from UCI. The experimental results prove that the combining predictors for the MLA-ANFIS show performance improvements compared to the pure MLA-ANFIS method.     

领导行为对员工创造力的影响:基于变量中心和个体中心的视角*

以10家IT企业的305名员工为被试,采用变量中心和个体中心的分析策略,考察领导行为对员工创造力的影响。变量中心的分析发现,变革领导行为和交易领导行为均显著正向预测员工创造力。个体中心的分析发现,中变革/中交易与(中、低)被动结合的领导类型最为普遍,占全部领导的69.2%;无论被动放任行为高低,高变革与高交易行为组合领导下的员工创造力最高,说明高变革和高交易领导行为的结合最有利于员工创造力,领导类型对员工创造力的影响主要由使用变革和交易这两种领导行为的程度所决定。     

The use of reliable digits to detect malingering in a criminal forensic pretrial population

The present research is a cross-validation of previous investigation by Greiffenstein, Baker; and Gola; Greiffenstein, Gola, and Baker; and Meyers and Volbrecht on the reliable digits (RELD) method of detecting suspected malingering on the Wechsler Adult Intelligence Scale-Revised (WAIS-R). The results support the use of the RELD method on a criminalforensic pretrial population (N = 187). Sensitivities, specificities, and incremental hit ratesfor two cut levels of the RELD method, Minnesota Multiphasic Personality Inventory-2 (MMPI-2) Infrequency and the Personality Assessment Inventory Negative Impression Scales, as well as multiple combined cut scores, were comparable to those observed in previous studies that used neuropsychologically evaluated participants. The selection of which cut score or combination of cut scores is appropriate on the RELD method is also discussed.     

Specifying importance weights consistent with a covariance structure

Many situations exist in which multiple dimensions must be combined to create a composite which reflects overall utility or value to a decision maker. A linear combination is often used in which the decision maker's importance weights are multiplied by values of each dimension and then added. When the decision maker's weights are applied, however, the dimension values must have equal variance and essentially zero correlations, or else the ordering on the composite will be incorrect. In this paper, we provide a method which compensates for dimension correlation and inequality of dimension variance. The method is illustrated with ratings of modifications proposed for nuclear power plants.