论模糊BH-代数

引入了模糊BH－代数和模糊拓扑BH－代数的概念，给出了一些有关的性质，并用Foster关于同态象和同态逆象的结构讨论了模糊拓扑BH－代数。     

Class Level as a Possible Mediator of the Relationship between Grades and Student Ratings of Teaching

Although the research literature investigating the relationship between grade awarded to students and students’ evaluations of teaching performance is voluminous, very few studies have examined the grade‐rating relationship according to level of student. The present study examined correlations between mean instructor rating and mean class grade for all course evaluations (N = 625 classes) at Utah State University during an academic quarter. In lower‐division (courses 100–299) and upper‐division (courses 300–599) undergraduate classes, correlations between grades and ratings of faculty were of an expected direction and magnitude (0.29 and 0.28, respectively); however, the grade‐rating correlation for graduate classes (courses 600 +) was — 0.20. It is speculated that graduate students are both better students and more critical evaluators of instruction, but replication and extension with different samples are needed before this tentative explanation can be accepted with confidence.     

A stratified study of students’ understanding of basic optics concepts in different contexts using two‐tier multiple‐choice items

A large scale study involving 1786 year 7–10 Korean students from three school districts in Seoul was undertaken to evaluate their understanding of basic optics concepts using a two‐tier multiple‐choice diagnostic instrument consisting of four pairs of items, each of which evaluated the same concept in two different contexts. The instrument, which proved to be reliable, helped identify several context‐dependent alternative conceptions that were held by about 25% of students. At the same time, students’ performance on the diagnostic test correlated with the location of the schools, students’ achievement in school science and their attitudes to science learning. However, students’ grade levels had limited influence on their understanding of basic concepts in optics as measured by the instrument.     

Korean early childhood educators' multi-dimensional teacher self-efficacy and ECE center climate and depression severity in teachers as contributing factors

This study investigated profiles of South Korean early childhood educators' teacher self-efficacy and contributing factors to teacher self-efficacy. The contributing factors were examined with a focus on early childhood education (ECE) center climate and depression severity in teachers as well as teacher and classroom characteristics. The results suggested that Korean early childhood educators' teacher self-efficacy was multi-dimensional, and each dimension had unique predictors. ECE center climate emerged as the most significant contributor to all teacher self-efficacy domains. Depression severity in teachers was associated with teacher self-efficacy but the facets of association were different according to the attributes of the efficacy domains. Instructional efficacy, which directly pertains to teaching professions, was not associated with depression in teachers. On the other hand, teacher self-efficacy domains containing affective aspects, such as creating positive social contexts and parental involvement and decision-making, were vulnerable to depression severity.     

User acceptance of a digital library system in developing countries: An application of the Technology Acceptance Model

This study examines the factors that influence people's adoption and use of a digital library system and tests the applicability of the Technology Acceptance Model (TAM) in the context of developing countries. Using data from a survey of 16 institutions in Africa, Asia, and Central/Latin America (N = 1082), a path analysis revealed that perceived ease of use of the library system had a significant impact on perceived usefulness, which ultimately led to behavioral intention to use. In addition, the study examined the similarities and differences in the significant predictors of the digital library acceptance across countries and continents. Further, the current study suggests that external variables that affect perceived ease of use and usefulness need to be considered as important factors in the process of designing, implementing, and operating digital library systems. Such consideration will help decrease the mismatch between system design and local users’ realities, and further facilitate the successful adoption of digital library systems in developing countries.     

Reconceptualizing the Zone of Proximal Development: The Importance of the Third Voice

A reconceptualization of the zone of proximal development (ZPD) is proposed by introducing the notion of dialogicality and voice. Drawing on Bakhtin’s semiotics, it is argued that the dialogical interactions occurring within the ZPD must be understood in a larger context to go beyond the visible and audible participants. More specifically, in addition to the first voice of the more capable participant and the second voice of the less competent participant, there is a third voice that serves as an immediate agenda of the ZPD. The third voice exerts its influence through the first voice by mediating the latter’s intrapsychological functioning. The compatibility between the agenda of the third voice and the developmental goals of the zone determines whether the progression through the ZPD is enhanced or constrained. Standardized testing is given as an example of the third voice with a focus on its compatibility with the developmental goal of the ZPD. Barohny Eun is mainly interested in developing an instructional model for K-5 English as a Second Language (ESL) students based on the sociocultural theories of Vygotsky. Steven E. Knotek is mainly interested in early intervention and literacy. Audrey L. Heining-Boynton is mainly interested in foreign and second language education.     

Extending the Television Brand: An Examination of Why Consumers Use Broadcast Network Web Sites

Framed by the technology acceptance and customer-based brand equity (CBBE) models, this study investigated how audiences intend to use broadcast television network Web sites. Drawing upon the results of a survey (N = 178), this research found that perceived ease of use and perceived enjoyment significantly influence intent to use broadcast Web sites. Findings also reveal that CBBE plays a significant role as a mediator between motivations and behavioral intention to use broadcast networks' Web sites. It is concluded that as the medium of television evolves, networks' Web sites should be conduits for sustained brand allegiance and broadcasters should make more strategic use of their Web sites.     

Analyzing noise-induced tracking errors in control systems with saturation: A stochastic linearization approach

Noise Induced Tracking Error (NITE) refers to the tracking error of the mean of the output in feedback control systems with nonlinear instrumentation subject to zero-mean measurement noise. Most of the previous work rely on the stochastic averaging for NITE analysis, the validity of which requires that the bandwidth of the zero mean measurement noise is much higher than that of the system. This is because the results obtained by stochastic averaging are asymptotic with respect to the noise bandwidth. Due to the asymptotic nature of the analysis tool, it is not straightforward to provide a quantitative argument for high bandwidth. An alternative method in the literature that can analyze NITE is stochastic linearization for random input, which is analogous to the well known describing function approach for sinusoidal input. Unlike stochastic averaging, stochastic linearization is not an asymptotic approximation. Therefore, analysis can be carried out for any given noise bandwidth. We carry out NITE analysis using stochastic linearization for a class of LPNI systems that are prone to NITE; identify the system conditions under which the averaging analysis of NITE may yield inaccurate results for a finite noise bandwidth; and prove that the results from the two methods agree as the noise bandwidth approaches infinity. In addition, an existing NITE mitigation strategy is extended based on the proposed method. Numerical examples are given to illustrate the results.     

Current status,future trends,and issues in human performance technology,part 1: Influential domains,current status,and recognition of HPT

Fifteen human performance technology experts participated in a survey investigating HPT's current status, future trends, and issues. Although HPT is not fully recognized in many organizations, such strengths as systems thinking and multidisciplinary approaches to performance problems are valued. Weaknesses reported are the rare use of HPT in small organizations, falling for quick fixes, and shortcomings in evaluation. HPT professionals need to do better at clarifying HPT principles, communicating HPT values, and demonstrating HPT's organizational impact.