环上的Fuzzy同余

定义了环上的Fuzzy同余关系，讨论了带有Fuzzy同余关系的环R的性质．证明了：如果R是一个带有Fuzzy同余关系的环，其Fuzzy同余关系的核是R的一个Fuzzy理想；并给出了带有Fuzzy同余关系的环的同态性质．     

无限幂群的正则表示

利用群作用给出了一经线性(无限)群在无限幂群上的作用，利用这一作用定义了无限幂群的正则表示和相应的矩阵表示。     

Acquisition with partial and continuous reinforcement in pigeon autoshaping

Contemporary time accumulation models make the unique prediction that acquisition of a conditioned response will be equally rapid with partial and continuous reinforcement, if the time between conditioned stimuli is held constant. To investigate this, acquisition of conditioned responding was examined in pigeon autoshaping under conditions of 100% and 25% reinforcement, holding intertrial interval constant. Contrary to what was predicted, evidence for slowed acquisition in partially reinforced animals was observed with several response measures. However, asymptotic performance was superior with 25% reinforcement. A switching of reinforcement contingencies after initial acquisition did not immediately affect responding. After further sessions, partial reinforcement augmented responding, whereas continuous reinforcement did not, irrespective of an animal's reinforcement history. Subsequent training with a novel stimulus maintained the response patterns. These acquisition results generally support associative, rather than time accumulation, accounts of conditioning.     

A reconceptualization of learning disabilities via a self-organizing systems paradigm

A dilemma exists regarding the interpretation of learning disabilities. A self-organizing systems (SOS) paradigm suggests widespread, diffuse outcomes, whereas a specific learning disability concept suggests more localized dysfunction. There may be very good reason to doubt the veridicality of the concept of a specific learning disability, not because the construct of learning disabilities itself is a frivolous concept, as some have held, but because the biological or neurological events that underlie a learning disability do not remain focal and constrained only to specific dysfunction. It is important to know whether an identified learning disability remains contained or whether processing disorders might be found in other areas. The assessment profiles of school-age children identified with nonverbal learning disabilities (NLD), assumed to have primarily right-hemispheric brain dysfunctions, and children with language-based learning disabilities (LLD), assumed to have primarily left-hemispheric brain dysfunctions, were examined to explore learning disabilities using an SOS paradigm. The pilot study reported here is used as an exemplar of how a self-organizing systems paradigm is conceptualized. Although a more comprehensive study is needed to confirm the data, this exemplar suggests that overflow into areas not typically associated with each disability subtype may occur. Concerns regarding ways of determining discrepancy for diagnostic purposes are noted, and remediation strategies designed for specific disabilities are questioned.     

School attendance problems and youth psychopathology: structural cross-lagged regression models in three longitudinal data sets

This study tests a model of reciprocal influences between absenteeism and youth psychopathology using 3 longitudinal datasets (Ns = 20,745, 2,311, and 671). Participants in 1st through 12th grades were interviewed annually or biannually. Measures of psychopathology include self-, parent-, and teacher-report questionnaires. Structural cross-lagged regression models were tested. In a nationally representative data set (Add Health), middle school students with relatively greater absenteeism at Study Year 1 tended toward increased depression and conduct problems in Study Year 2, over and above the effects of autoregressive associations and demographic covariates. The opposite direction of effects was found for both middle and high school students. Analyses with 2 regionally representative data sets were also partially supportive. Longitudinal links were more evident in adolescence than in childhood.     

Child abuse in religiously-affiliated institutions: long-term impact on men's mental health

OBJECTIVE: To describe the long-term impact of physical and sexual abuse of boys by someone in a trusting, non-familial relationship. This clinical study reports on the psychological functioning of men (N = 76) with substantiated claims against a residential religiously-affiliated institution for multiple and severe incidents of sexual, physical, and/or emotional abuse during childhood. The abuse was perpetrated by several adults in positions of authority and trust at the institution. METHODS: Each participant received a clinical interview and was administered psychological tests and a structured interview for DSM-IV diagnoses. The same clinician completed all of the assessments. RESULTS: DSM-IV criteria were met for current PTSD (42%), alcohol (21%), and mood-related disorders (25%). Over one-third of the sample suffered chronic sexual problems, and over one half had a history of criminal behavior. CONCLUSIONS: The clinical findings provide direction for assessing victims of historical abuse, and underscore the importance of awareness, prevention, and treatment needs for those who have been abused in institutional settings. Conclusions are limited due to participants' involvement in civil action, unknown pre-existing conditions, and the lack of a suitable comparison group.