含有自校正模型的加权多模型自适应控制

研究了含有大范围参数不确定性离散时间被控对象的加权多模型自适应控制问题(包括模型集构建和加权算法分析).通过构建含有自校正模型和多个固定模型的模型集覆盖并逼近被控对象,在模型输出误差可分的前提下,采用基于模型输出误差性能指标的加权算法,并依据固定模型中是否包含真实被控对象模型的不同情形分析加权算法的收敛性.在权值收敛的前提下,利用虚拟等价系统理论,分析了参数未知线性时不变和参数跳变的情形,在不依赖于特定局部控制算法的基础上,证明了此种模型集构建下的加权多模型自适应控制系统的稳定性和收敛性,放宽了先期加权多模型自适应控制系统稳定性分析中关于模型集构建的约束条件.最终,通过计算机MATLAB仿真,验证了此类加权多模型自适应控制系统的收敛性和闭环稳定性.     

Anticipated model consequences, model affect, and imitation.

60 3rd and 4th graders individually observed a videotaped adult who either encouraged or prohibited a model's play with toys while he was gone; after the adult's departure, the model performed 6 distinctive play behaviors and exhibited a grin, frown, or blank stare following each play response. Analysis of variance revealed that anticipated-reward Ss surpassed anticipated-punishment Ss on 4 measures: number of imitative responses, number of different imitative responses, duration of imitative play, and number of nonimitative responses with toys not used by the model. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A neuropsychodiagnostic model

Central Nervous System pathology in children is regarded as a neurophysiological and/or neuroanatomical disorder leading to the production of a broad spectrum of symptomatic indicators, many of which are psychological in nature. This fundamental relationship between neurological integrity and various categories of psychopathology represents the theoretical core of a specific diagnostic rationale elaborated in the context of a neuropsychodiagnostic model. A battery of psychological tests, as one component of a more general assessment approach, is proposed as a psychoeducational method complementing the more traditional medical approach to the diagnosis of various neuropathological conditions in children, especially minimal brain damage/dysfunction.     

The PACT model

Topical application of the vitamin D analogue calcipotriol has been found to be of clinical value in the treatment of dermatological disorders. This is considered to be safe with respect to alterations in calcium homeostasis. We report a 17-year-old female patient who developed hypercalcaemic crisis after excessive use of calcipotriol for ichthyosis. The clinical condition and serum calcium improved after cessation of calciprotiol treatment and rehydration with intravenous fluids and electrolytes. The case emphasizes the importance of limiting the topical use of calcipotriol as recommended by the manufacturer.     

The California model

Between January 1, 1991 and June 30, 1996, physicians performed 800 cases of tubal ligation via minilaparotomy under local anaesthesia in the Obstetrics and Gynecology clinic of the Dakar University Teaching Hospital (Senegal). There were complications in 7 (0.87%) cases (bladder and bowel injuries: 6 cases, and post operative infection: 1 case). The most frequent risk factors were: surgeon skill (lack of experience of surgeon in minilaparotomy), type of patients (obesity, previous abdominal surgery). It was concluded, proper training and experience of the surgical team is needed to minimize sterilization related complications.     

Predicting category intuitiveness with the rational model, the simplicity model, and the generalized context model.

Na?ve observers typically perceive some groupings for a set of stimuli as more intuitive than others. The problem of predicting category intuitiveness has been historically considered the remit of models of unsupervised categorization. In contrast, this article develops a measure of category intuitiveness from one of the most widely supported models of supervised categorization, the generalized context model (GCM). Considering different category assignments for a set of instances, the authors asked how well the GCM can predict the classification of each instance on the basis of all the other instances. The category assignment that results in the smallest prediction error is interpreted as the most intuitive for the GCM—the authors refer to this way of applying the GCM as “unsupervised GCM.” The authors systematically compared predictions of category intuitiveness from the unsupervised GCM and two models of unsupervised categorization: the simplicity model and the rational model. The unsupervised GCM compared favorably with the simplicity model and the rational model. This success of the unsupervised GCM illustrates that the distinction between supervised and unsupervised categorization may need to be reconsidered. However, no model emerged as clearly superior, indicating that there is more work to be done in understanding and modeling category intuitiveness. (PsycINFO Database Record (c) 2010 APA, all rights reserved)