排序方式： 共有37条查询结果，搜索用时 15 毫秒
21.
Daniel Ansari 《Learning and individual differences》2010,20(2):123-129
The present paper provides a critical overview of how adult neuropsychological models have been applied to the study of the atypical development of numerical cognition. Specifically, the following three assumptions are challenged: 1. Profiles of strength and weaknesses do not change over developmental time. 2. Similar neuronal structures are activated in children and adults, as well as the notion that 3. Similarities in behavioral performance imply equivalence in underlying neurocognitive mechanisms. Data from behavioral and neuroimaging studies with both typically and atypically developing children is reviewed to illustrate the pitfalls of these assumptions. The present review proposes that, instead of resting on adult neuropsychological models, the use of both cross-sectional and longitudinal methods is required to elucidate the age-related changes in brain and behavior that give rise to the breakdown of numeracy and mathematics. Empirical data derived from such studies will generate explanatory models of the development of atypical numerical cognition. 相似文献
22.
Heritage institutions, as one of the main aspects of culture, play an important role in economic prospect of culture by promoting tourism industry. Turning to the interpretation of culture in economic terms, the goal of this paper is to adopt a practical evaluation tool in order to assess the efficiency of heritage institutions. This study evaluates the technical efficiency of a regional system of museums in Tehran, the capital of Iran, using Data Envelopment Analysis approach. The findings may prove useful for management of these institutions in economic point of view, as well as for those responsible for public resource allocation policies in the area of cultural heritage. 相似文献
23.
This study investigates gender differences in basic numerical skills that are predictive of math achievement. Previous research in this area is inconsistent and has relied upon traditional hypothesis testing, which does not allow for assertive conclusions to be made regarding nonsignificant findings. This study is the first to compare male and female performance (N = 1,391; ages 6–13) on many basic numerical tasks using both Bayesian and frequentist analyses. The results provide strong evidence of gender similarities on the majority of basic numerical tasks measured, suggesting that a male advantage in foundational numerical skills is the exception rather than the rule. 相似文献
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25.
Many technology studies have conceptualized transitions between technological generations as a series of S-curve performance improvements over time. Surprisingly, the interregnum between successive generations has received little attention. To understand what happens in the interregnum, we study the transition from 2G to 3G in mobile communications. Our study identifies the presence of forces for both change and continuity across heterogeneous social and technical elements shaping an uneven transition between 2G and 3G mobile communications technology platforms. Unanticipated misalignments and asynchronies that emerged during the journey shifted the incentives of the various actors involved to participate. Based on these observations, we offer several conjectures as to the dynamics that can give rise to temporal discords during inter-generational technological transitions. 相似文献
26.
Tester F. Ashavaid Sucheta P. Dandekar S. Khodaiji M. H. Ansari Adarsh Pal Singh 《Indian journal of clinical biochemistry : IJCB》2009,24(4):356-360
Improving specimen quality as well as healthcare worker (HCW) safety poses significant concerns for today’s laboratories.
With an increasing number of diagnostic tests requested, laboratory professionals are faced with challenges to reduce laboratory
errors, improve the quality of laboratory results to assure accurate diagnosis and implement initiatives to ensure healthcare
worker safety and minimize risk of exposure to bloodborne pathogens. A prior study conducted in 2008 reported that variations
in blood collection methods for clinical chemistry assays may affect overall specimen quality. As a follow up, the current
study assessed the quality of 22563 patient specimens for cell counting in EDTA blood collection tubes that were obtained
with needle and syringe collection (open) using either disposable tubes or re-washed glass vials or with an evacuated blood
collection system (closed). Based on the observations, the use of the evacuated blood collection system resulted in better
preanalytical specimen quality as compared with needle and syringe collection. The findings also showed an approximately 70-fold
reduction in the incidence of clotting as well as fewer instrument-generated flags using the evacuated collection system.
In addition, the use of an evacuated collection system for venous blood collection demonstrated lesser chance of blood exposure
to healthcare workers. 相似文献
27.
When radical innovations impact an industry, established incumbents are sometimes displaced by new challengers, yet at other times, survive and prosper. What are the factors that influence these possible outcomes? Extensive as the studies are in providing insights into incumbent-challenger dynamics (ICD), the fragmented nature of the literature and the isolated treatment of various constructs at a particular level of analysis, merit a review and analysis. We (1) identify, collate and analyse several constructs from three categories; the industry, the firm and the challenge, (2) discuss the interactions among these constructs and (3) show that incumbent failure or success can be better understood when these constructs are concurrently analysed. We derive several propositions for stimulating research and develop a holistic multi-level framework for understanding incumbent-challenger dynamics. We pull together strategic management theories at the industry level with those at the organizational and inter-organizational levels in the context of disruptive innovations. We contribute by bringing in the challenge dimension across these levels to inform whether an innovation is disruptive in its effects, not just ex post but also ex ante. For illustrative purposes and to concretize our arguments, we draw on both primary data from the Dutch television industry and archival data from four episodes of disruptive innovations. 相似文献
28.
Richard McCreadie Shahzad Rajput Ian Soboroff Craig Macdonald Iadh Ounis 《Information processing & management》2019,56(5):1815-1836
Timeline generation systems are a class of algorithms that produce a sequence of time-ordered sentences or text snippets extracted in real-time from high-volume streams of digital documents (e.g. news articles), focusing on retaining relevant and informative content for a particular information need (e.g. topic or event). These systems have a range of uses, such as producing concise overviews of events for end-users (human or artificial agents). To advance the field of automatic timeline generation, robust and reproducible evaluation methodologies are needed. To this end, several evaluation metrics and labeling methodologies have recently been developed - focusing on information nugget or cluster-based ground truth representations, respectively. These methodologies rely on human assessors manually mapping timeline items (e.g. sentences) to an explicit representation of what information a ‘good’ summary should contain. However, while these evaluation methodologies produce reusable ground truth labels, prior works have reported cases where such evaluations fail to accurately estimate the performance of new timeline generation systems due to label incompleteness. In this paper, we first quantify the extent to which the timeline summarization test collections fail to generalize to new summarization systems, then we propose, evaluate and analyze new automatic solutions to this issue. In particular, using a depooling methodology over 19 systems and across three high-volume datasets, we quantify the degree of system ranking error caused by excluding those systems when labeling. We show that when considering lower-effectiveness systems, the test collections are robust (the likelihood of systems being miss-ranked is low). However, we show that the risk of systems being mis-ranked increases as the effectiveness of systems held-out from the pool increases. To reduce the risk of mis-ranking systems, we also propose a range of different automatic ground truth label expansion techniques. Our results show that the proposed expansion techniques can be effective at increasing the robustness of the TREC-TS test collections, as they are able to generate large numbers missing matches with high accuracy, markedly reducing the number of mis-rankings by up to 50%. 相似文献
29.
Previous studies indicate that individuals with borderline personality disorder come from families marked by high levels of psychopathology as well as dysfunctional parenting styles—themes that tend to engender negative attitudes toward parents. However, we are not aware of any studies that have examined perceptions of parenting quality and borderline personality symptoms in a clinical but non-psychiatric population—the purpose of the present study. Using a cross-sectional self-report survey methodology in a sample of internal medicine outpatients, we examined participants’ perceptions of the quality of parental caretaking using a one-item assessment, and examined borderline personality symptomatology using two measures. Ratings of the quality of parental care were statistically significantly inversely correlated with scores on both measures of borderline personality symptomatology. After controlling for the number of caretakers during childhood, the observed statistical relationships remained statistically significant. In this primary care sample, participants with borderline personality symptomatology perceived parents more negatively than those without such symptomatology. 相似文献
30.
Mehtab Alam Ansari Gautam J. N. Shahwar Fatima 《Cataloging & classification quarterly》2017,55(4):247-265
The purpose of this article is to highlight the status and application of an automated cataloging system in central university libraries in north India. Data has been collected using questionnaires. Interview and observation techniques have also been used to bring objectivity in the present study. Results show that varying levels of progress have been made with respect to implementation of a cataloging system. Results also show that with the help of automation, libraries have satisfied user communities by way of easy retrieval. It has removed discrepancies and set a trend for standardization. Furthermore, staff morale has been boosted up in an automated environment. 相似文献