Cognitive radio signal classification based on subspace decomposition and RBF neural networks

Spectrum sensing is one of the major challenges for commercial development of cognitive radio systems, since the detection of the presence of a primary user is a complex task that requires high reliability. This work proposes a signal classifier capable of detecting and identifying a primary user signal on a given channel of the radio spectrum. The proposed approach combines eigen-decomposition techniques and neural networks not only to decide about the presence of a primary user, but also to identify the primary user signal type, a feature that is not encountered in the current approaches proposed in literature. Besides the advantage of identifying the primary user type, the proposed method also considerably reduces the computational cost of the detection process. The proposed classification method has been applied to the development of five primary user signal Classification Modules, which includes wireless microphone, orthogonal frequency-division multiplexing and Digital Video Broadcasting-Terrestrial signals. The results show that the proposed classifier correctly detects and identifies the primary users, even under low signal to noise ratio and multipath scenarios.     

The effect of multimedia discrepancies on metacognitive judgments

This study investigated undergraduate students’ metacognitive judgments while learning about complex science topics using multimedia material (text and graph). A within-subjects design was used to examine the effect of discrepancies on study-time allocation, metacognitive judgments and inference generation. There were three types of discrepancies: none, text (between two ideas in the text) and text and graph (between the text and graph). Forty (N = 40) participants completed 12 trials where they were asked to provide six judgments: Ease of Learning judgments (EOLs), immediate and delayed Judgments of Learning (JOLs) for both text and graph and Retrospective Confidence Judgments (RCJs). Overall, participants provided significantly lower JOLs for content that contained discrepancies but RCJs remained high across conditions. Discrepancies did not influence study-time allocation, but did significantly influence inference scores. Overall, results suggest that participants’ judgments are different for different aspects of multimedia content and may be based on the text.     

零售业怎样以客户为中心

编者按：GCCRM(www．gccrm．com)创建于2001年,是一家独立的CRM评估机构,也是目前大中华地区最大的客户关系管理社团。他们通过网站传播、培训、调研活动等一系列的途径让客户获取更多更新更准确的国内外有关CRM的理念、方法和实际案例。本刊现与其合作,陆续将适合零售业、快速消费品行业和服务业的CRM理念和实操方法提供给读者。快速消费品(FMCG,Fast Moving Consumer Goods)是指消费者消耗较快、需要不断重复购买的产品。典型的快速消费品包括日化用品、食品饮料、烟草等：药品中的非处方药(OTC)通常也归为此类。FMCG的营销、通路、广告和公关都随着消费者的特性而呈现不同的特色。FMCG的涵义已经从一类产品的总和上升到一种营销和沟通方式的总和。     

Cognitive processing therapy for veterans with military-related posttraumatic stress disorder.

Sixty veterans (54 men, 6 women) with chronic military-related posttraumatic stress disorder (PTSD) participated in a wait-list controlled trial of cognitive processing therapy (CPT). The overall dropout rate was 16.6% (20% from CPT, 13% from waiting list). Random regression analyses of the intention-to-treat sample revealed significant improvements in PTSD and comorbid symptoms in the CPT condition compared with the wait-list condition. Forty percent of the intention-to-treat sample receiving CPT did not meet criteria for a PTSD diagnosis, and 50% had a reliable change in their PTSD symptoms at posttreatment assessment. There was no relationship between PTSD disability status and outcomes. This trial provides some of the most encouraging results of PTSD treatment for veterans with chronic PTSD and supports increased use of cognitive- behavioral treatments in this population. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Change in posttraumatic stress disorder symptoms: Do clinicians and patients agree?

This study assessed the longitudinal association between clinician and patient ratings of posttraumatic stress disorder (PTSD) symptoms over the course of 2 different randomized clinical trials of veterans with chronic PTSD. One trial, the Department of Veterans Affairs Cooperative Study 420 (CSP 420; N = 360) compared trauma-focused and present-centered group therapies, and the 2nd trial compared cognitive processing theory and a waitlist control condition (N = 60). Linear mixed effects modeling revealed significant associations between clinician ratings (Clinician-Administered PTSD Scale; CAPS; D. D. Blake et al., 1990) and patient ratings (Posttraumatic Stress Disorder Checklist; PCL; F. W. Weathers, B. T. Litz, J. A. Herman, J. A. Huska, & T. M. Keane, 1993) in total and symptom clusters of PTSD. Contrary to hypothesis, the amount of change on the CAPS ranged from .75 to .82 standard deviations for every 1 standard deviation change on the PCL. The CAPS and PCL were more closely associated in the trauma-focused vs. present-centered treatment condition in CSP 420, and especially regarding hyperarousal symptoms. When comparing categorization of clinically significant change on the CAPS and PCL, the authors found no differences in the percentages of agreement between clinicians and patients in improvement and exacerbation. The value of multimodal assessment of PTSD treatment outcomes is discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Variations of Cd/Pb and Zn/Pb ratios in Taipei aerosols reflecting long-range transport or local pollution emissions

Along with windblown dust, large quantities of pollutants are annually brought out of continental China by the westerlies in winter and spring; thereafter, they are partly subjected to transport by northeastern monsoon winds to Taiwan. To characterize the heavy metal composition differences between long-range transported and local aerosols and to evaluate metal contributions from long-range transported aerosols during the northeastern monsoon season, both PM(10) and PM(2.5) aerosols collected from Taipei, Taiwan from February 2002 to March 2003 were analyzed for three selected heavy metals, namely Pb, Cd and Zn using ICP-MS. Monthly patterns show that Pb concentrations in winter (62 ng/m(3)) were over two times higher than those in the other seasons, which is attributed to long-range transport from areas under development in China. Low Cd/Pb (0.017) and Zn/Pb (1.82) ratios were measured in aerosols collected during the Asian dust period, in which the ambient aerosols consisted predominantly of long-range transported pollutants. By contrast, high Cd/Pb (0.030) and Zn/Pb (3.44) ratios were observed during the summer monsoon season, in which aerosols were dominated by local pollutant emissions. Cd/Pb and Zn/Pb ratios appear to be successfully applied to identify the pollutants originating principally from the long-range transport or from local emissions. In addition, by assuming that a significant fraction of heavy metals associated with coarse airborne dust have settled to the sea prior to reaching Taiwan in spring, a mechanism is suggested to explain why higher anthropogenic metal concentrations occurred in winter than those in dust-rich spring.     

The spectrum of Trp- mutants isolated as 5-fluoroanthranilate-resistant clones in Saccharomyces bayanus, S. mikatae and S. paradoxus

5-Fluoroanthranilic acid (FAA)-resistant mutants were selected in homothallic diploids of three Saccharomyces species, taking care to isolate mutants of independent origin. Mutations were assigned to complementation groups by interspecific complementation with S. cerevisiae tester strains. In all three species, trp3, trp4 and trp5 mutants were recovered. trp1 mutants were also recovered if the selection was imposed on a haploid strain. Thus, FAA selection may be more generally applicable than was previously described.     

Dissecting daily distress in mothers of children with ADHD: An electronic diary study.

It is well known that parents of children with attention-deficit/hyperactivity disorder (ADHD) experience elevated levels of caregiver stress, but little is known about the ebb and flow of parental distress as it happens, or the degree of synchrony between short-term oscillations in child behaviors and maternal distress. Electronic diaries (eDiaries) were used to dissect daily distress in natural settings. Across 7 days during nonschool hours, half-hourly eDiaries were completed independently by mothers and their 8- to 12-year-old children (51 receiving medication for ADHD and 58 comparison peers). Diary items tapped behaviors, moods, and contexts, with children reporting their own behaviors and mothers reporting on themselves and their children. Maternal distress and child ADHD-type behaviors exhibited moderate to strong associations “in the moment,” whether child behaviors were reported by mothers or children. This mother-child synchrony emerged for the comparison as well as the ADHD group, although the associations were stronger when the dyad included a child with ADHD. Because fixed-effects analyses were conducted, these patterns are not attributable to levels of psychopathology or other stable individual differences in mothers or children. Further moderation analyses revealed that the links between child behaviors and maternal distress were strengthened by maternal risk and attenuated by child behavioral self-esteem; these effects were modest but detectable. These findings can help guide not only interventions targeted on improving quality of life in families of children with ADHD, but also programs designed to help all parents identify and manage their own parenting stressors. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Parenting in mothers with and without attention-deficit/ hyperactivity disorder.

The authors examined the impact of maternal attention-deficit/hyperactivity disorder (ADHD) on parenting behaviors. Sixty mothers between the ages of 31 and 50 with (n = 30) and without (n = 30) ADHD and their 8- to 14-year-old children with ADHD completed self-report and laboratory measures of monitoring of child behavior, consistency in parenting, and parenting problem-solving abilities. These parenting behaviors were selected because of their established links to the development of child behavior problems. As predicted, mothers with ADHD were found to be poorer at monitoring child behavior and less consistent disciplinarians compared with mothers without ADHD. There was some evidence to support the prediction that mothers with ADHD were less effective at problem solving about childrearing issues than control mothers. The differences between the 2 groups of mothers persisted after child oppositional and conduct-disordered behavior were controlled. These results indicate that parenting is an area of functioning that requires more attention in adult ADHD research. (PsycINFO Database Record (c) 2010 APA, all rights reserved)