A probabilistic model of information retrieval: development and comparative experiments: Part 2

The paper combines a comprehensive account of the probabilistic model of retrieval with new systematic experiments on TREC Programme material. It presents the model from its foundations through its logical development to cover more aspects of retrieval data and a wider range of system functions. Each step in the argument is matched by comparative retrieval tests, to provide a single coherent account of a major line of research. The experiments demonstrate, for a large test collection, that the probabilistic model is effective and robust, and that it responds appropriately, with major improvements in performance, to key features of retrieval situations.Part 1 covers the foundations and the model development for document collection and relevance data, along with the test apparatus. Part 2 covers the further development and elaboration of the model, with extensive testing, and briefly considers other environment conditions and tasks, model training, concluding with comparisons with other approaches and an overall assessment.Data and results tables for both parts are given in Part 1. Key results are summarised in Part 2.     

Lessons for Preschool Language Socialization from the Vantage Point of the First Day of Kindergarten

All 12 kindergarten classrooms from a small town/rural Midwestern county were observed for the full session on the first day of school to determine teachers' language and classroom practices. Data collection included completion of a classroom checklist by the investigator and running accounts of classroom events with verbatim notes of teacher language. The findings from this study provide evidence of demands for entering kindergartners to process complex language, organize themselves and their materials, and comply with many new rules and procedures. Based on these data, the author and participating teachers present recommendations for preschool teachers, kindergarten teachers, and researchers. The findings provide convergent validity for previous surveys of teacher expectations for children at kindergarten entry. They can be used by preschool personnel to plan preschool language experiences to assist young children's transition to kindergarten. The method of classroom observation employed here can also help local personnel in varied communities to shape a more seamless system of experiences for the early years.     

辽宁装备制造业知识产权战略研究

进入知识经济和全球化时代,知识产权作为核心竞争力,已成为企业参与市场竞争的重要手段。通过对辽宁地区10余家装备制造企业知识产权现状的分析与研究,提出建立实施辽宁装备制造业知识产权战略的若干建议,从而大力增强辽宁装备制造业的核心竞争力,实现跨越式发展。     

The Role of Students’ Personality Characteristics, Self-Perceived Competence and Learning Conceptions in the Acquisition and Development of Social Communicative Competence: A Longitudinal Study

An important purpose of higher social work education is to guide students to acquire and develop social-communicative competencies. The purpose of this study was to investigate the role students’ personality characteristics, self-perceived communicative competence and learning conceptions play in the acquisition and development of social-communicative competencies. We designed and tested a hypothetical model on the student-related variables – self-perceived communicative competence, learning conceptions and reported learning activities regarding communication – in relation to performance scores. We were interested in developmental trends in the above mentioned variables. We also wanted to gain insight into the relationships among the variables. The study was set up according to a longitudinal, within-subjects design in order to study intra-individual changes. One-hundred and twenty-three first-year social-work students participated in this study. Many changes were found in students characteristics, reported deployed learning activities and study results during their first academic year. Except for confidence in “showing sympathy”, which was already relatively high at the beginning of the study, all scores on aspects of students’ self-perceived social-communicative competence increased. Assessment scores on comparable communication tests also increased significantly. Extraversion and emotional stability were the only two personality characteristics, which seemed rather stable. Agreeableness decreased while autonomy increased continuously during the first academic year. It seemed to be possible to set up a model, which may serve as a starting point for further research into the development of social-communicative competence.     

Dynamic Transition Patterns in Acculturation Among Hispanic Adolescents

Acculturation consists of multiple domains (i.e., cultural practices, identifications, and values). However, less is known about how acculturation processes influence each other across multiple domains of acculturation. This study was designed to investigate transition patterns of acculturative processes within and across domains in a sample of 302 recent-immigrant Hispanic adolescents, M_age (SD) = 14.51 years (0.88) at baseline; male = 53%). Adolescents were assessed six times over a 3-year period. Latent profile analyses identified two profiles (high [or increasing] vs. low) for each domain at each timepoint. We found largely stable transition patterns in each domain over six timepoints. Importantly, sequential associations among profiles in acculturation domains were also detected. Implication for acculturation theory and research are discussed.