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711.
《Social Work in Mental Health》2013,11(1-2):33-47
SUMMARY Biological understanding of a personality disorder is best achieved by examining the disorder's component dimensions, which for borderline personality disorder include impulsive aggression and affective instability. Current biological research into BPD aims to identify the neurotransmitters and brain regions implicated in each of these key domains. Because of advancing technologies and analytic strategies, structural and functional neuroimaging are at the forefront of such efforts. Structural neuroimaging, primarily in the form of magnetic resonance imaging (MRI) scans, gives information about the anatomy of the brain, while functional neuroimaging, primarily functional MRI (fMRI) and positron emission tomography (PET) scans, gives information about brain activity and neurotransmitter systems at the molecular level. BPD neuroimaging studies to date have implied the involvement of several neurotransmitter systems, principally serotonin, along with dysfunction of select brain regions, including the prefrontal cortex and amygdala, suggesting a “dualbrain pathology”: “hyperarousal-dyscontrol syndrome.” However, the exact mechanisms of all these putative etiologies remain unknown. 相似文献
712.
Conditional discrimination is inherent in the intraverbal relation when one verbal stimulus alters the evocative effect of another verbal stimulus and they collectively evoke an intraverbal response. Rarely in research on conditional discriminations have both conditional and discriminative stimuli been vocal verbal and rarely have the responses been topography-based. Making conditional discriminations in intraverbal behavior is a repertoire that is often delayed in children with autism and other developmental disabilities. Reviewed in this paper is research on teaching intraverbal behavior, auditory conditional discriminations, and restricted stimulus control. The purpose of these reviews is to identify the extent to which previous researchers examined conditional discriminations in the intraverbal relation and to recommend directions for research in this area. 相似文献
713.
Nick Hodge 《Disability & Society》2008,23(1):29-40
Disability research is conducted within a highly politicised 'hotbed' of competing paradigms and principles. New researchers, who want to work within the social model, are soon faced with complex and challenging methodological and philosophical dilemmas. The social model advocates research agendas that are focused on the emancipation and empowerment of disabled people but, in reality, these are rarely achieved. To be successful researchers need to engage with innovative and creative methodologies and to share their experiences of these within environments that welcome challenge and debate. This paper focuses on Lifeworld and assesses its value as a tool for emancipatory research. Using examples from a study with parents, whose children were in the process of being labelled as having autism, the paper illustrates how the principles that 'underpin' the methodology offered a supportive framework for a novice researcher. 相似文献
714.
Jennett Heather K. Harris Sandra L. Delmolino Lara 《The Analysis of verbal behavior》2008,24(1):69-85
The present study compared the effects of discrete trial instruction (DTI) and mand training on the acquisition of independent requests in 6 children with autism. Two multiple-probe designs across participants were conducted with 3 participants receiving mand training followed by DTI and the other 3 receiving DTI followed by mand training. Eye contact and challenging behaviors were also assessed across conditions. Results indicate that 5 of 6 participants made more independent requests and acquired requesting faster in the mand training condition, had slightly better eye contact in the DTI condition, and fewer challenging behaviors in the mand training condition. Overall, the results indicate that mand training is a more efficient method for teaching children with autism to make requests. 相似文献
715.
G. P. Nason R. von Sachs & G. Kroisandt 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2000,62(2):271-292
This paper defines and studies a new class of non-stationary random processes constructed from discrete non-decimated wavelets which generalizes the Cramér (Fourier) representation of stationary time series. We define an evolutionary wavelet spectrum (EWS) which quantifies how process power varies locally over time and scale. We show how the EWS may be rigorously estimated by a smoothed wavelet periodogram and how both these quantities may be inverted to provide an estimable time-localized autocovariance. We illustrate our theory with a pedagogical example based on discrete non-decimated Haar wavelets and also a real medical time series example. 相似文献
716.
提出了一种DS/SS信号盲同步算法,在此基础上利用特征分析法可解决相位不确定性的缺陷。该算法简单有效、计算量小,利于硬件实时处理。理论分析及计算机仿真结果表明,该算法在低信噪比条件下可实现DS/SS信号的盲同步及PN码序列的精确估计。 相似文献
717.
王晓岗 《华北水利水电学院学报(社会科学版)》2009,25(1):21-23
广谱类变论的基本概念是在质量互变规律的基础上,运用辩证结构主义思想和广义量化的方法,针对一般事物系统演化规律提出的。其突出的特点就是概念表达更加确切,边界描述更加清晰,实际应用更具有可操作性。 相似文献
718.
针对认知无线电系统的应用,提出了一种基于终端业务传输速率要求的限制区联合功率控制方案。该方案依据终端业务传输速率大小成比例的性质来分配终端发射功率。仿真结果表明,在认知无线电混合业务应用环境中,该方案可以兼顾不同业务速率终端传输速率的要求,为其分配比等功率分配方案更为合理的发射功率份额,提高了系统吞吐量和频谱利用效率。 相似文献
719.
Jamel Jouini 《Journal of applied statistics》2009,36(1):91-110
We investigate the instability problem of the covariance structure of time series by combining the non-parametric approach based on the evolutionary spectral density theory of Priestley [Evolutionary spectra and non-stationary processes, J. R. Statist. Soc., 27 (1965), pp. 204–237; Wavelets and time-dependent spectral analysis, J. Time Ser. Anal., 17 (1996), pp. 85–103] and the parametric approach based on linear regression models of Bai and Perron [Estimating and testing linear models with multiple structural changes, Econometrica 66 (1998), pp. 47–78]. A Monte Carlo study is presented to evaluate the performance of some parametric testing and estimation procedures for models characterized by breaks in variance. We attempt to see whether these procedures perform in the same way as models characterized by mean-shifts as investigated by Bai and Perron [Multiple structural change models: a simulation analysis, in: Econometric Theory and Practice: Frontiers of Analysis and Applied Research, D. Corbea, S. Durlauf, and B.E. Hansen, eds., Cambridge University Press, 2006, pp. 212–237]. We also provide an analysis of financial data series, of which the stability of the covariance function is doubtful. 相似文献
720.
This paper examines the response of residents in one inner-city, racially, and economically diverse neighborhood to a sudden increase in crime, drugs and disorder. Rather than withdrawing, residents in this neighborhood responded by organizing a major collective effort to develop a stabilization plan for the neighborhood. Factors useful in understanding this atypical response include a citywide structure that encourages citizen participation, the city government's commitment to the neighborhood, a history of neighborhood activism, and residents' commitment to the neighborhood. A social movement perspective that examines the nature of successful social movement organizations, the political context of movement activities, and micromovement processes is useful in analyzing cases of neighborhood activism. 相似文献