网络教学中学习者行为研究

网络教学摆脱了传统教学时间和地域因素的限制,但是现有的网络教学只是简单地将学习内容进行堆积和罗列,不同学习背景的学习者难以分辨哪一部分是适合自己的学习内容,严重影响了网络教学的效果。本文通过对学习者学习行为的判断,为学习者推荐合适的学习序列,从而达到针对不同学习者的行为,为学习者设计不同学习策略的目的。     

商务网络信息生态链结构模型构建

以生态学及信息生态链理论为研究基础,对商务网络信息生态链的含义及特征进行分析,深入探讨商务网络信息生态链的组成部分,明确阐述商务网络信息生态链的三大结构要素——"节点"、"节点关系"及"链接模式";在此基础上,借鉴"价值链"、"供应链"及"复杂系统论"等相关理论研究方法,从信息、信息主体、信息环境及信息技术4个因素出发,构建商务网络信息生态链的结构模型。     

Perceptions of Joint Family Storytelling as Mediators of Family Communication Patterns and Family Strengths

Using family communication patterns theory, this study tested the degree to which perceptions of joint family storytelling mediate the relationship between family communication patterns (i.e., conversation and conformity orientations) and family strengths. Participants included 267 young adults from first-marriage families. Results indicated that conversation orientation is positively associated with the interactional sense-making (ISM) behaviors that characterize jointly told family stories (i.e., engagement, polite turn-taking, perspective-taking and coherence) and family strengths, while conformity orientation is negatively associated with ISM behaviors and family strengths. Indirect effects emerged for conversation and conformity orientations on family strengths through perceptions of ISM behaviors. Specifically, perceptions of storytelling engagement and polite turn-taking mediated the positive association between conversation orientation and family strength, while engagement, perspective-taking, and polite turn-taking mediated the inverse association between conformity orientation and family strength.     

Experiencing and Managing Uncertainty about Climate Change

This paper joins uncertainty management and problematic integration literatures to better understand how people experience and manage uncertainty about climate change. Interviews with 235 stakeholders from private, public, and non-profit organizations in the state of Washington indicate an interesting disparity of certainty and the role of climate-related information. A majority of participants (n=137) were certain that energy use and climate change are related, and far fewer (n=13) were certain that they are not related. Our interpretive analysis indicates notable differences regarding the way people experience and management uncertainty.     

Fractionated evaluation of immunohistochemical hormone receptor expression enhances prognostic prediction in breast cancer patients treated with tamoxifen as adjuvant therapy

Objective:To compare the prognostic prediction between dichotomized and fractionated evaluations of hormone receptor expressions. Methods: Patients with stages I-III breast cancers, who received adjuvant tamoxifen, were enrolled. The expression of estrogen receptor (ER) and progesterone receptor (PR) was evaluated by immu-nohistochemistry (IHC). A fractionated score (F score), the percentage of positive-staining nuclei (0=none, 1=1%-10%, 2=11%-30%, 3=31%-50%, 4=51%-70%, and 5=71%-100%), was assigned to each...     

基于交易费用视角的生猪供应链上游结构变化趋势研究

生猪供应链上游有两种结构：猪贩作为中间商模式和直接交易模式。论文分别从交易三维度视角和模型化交易费用的视角，对两种结构中的交易费用进行了比较。结果表明，随着饲养规模的扩大，生猪供应链上游的结构方式将向直接交易模式转变。     

User acceptance of mobile e-government services: An empirical study

The traditional focus of e-government services research has been on non-mobile services but now with the incorporation of mobile services more people are able to access these Mobile e-government services (m-government services). In addition, such services are critical for improving user-to-government communication effectiveness and maintaining relationships. The purpose of this study is to identify the factors that determine user acceptance of these services. Based primarily on the theory of planned behavior and supplemented by the mobile communication perspective, a sample of 331 users of m-government services in Taiwan was tested. The findings show that perceived usefulness, perceived ease of use, trust, interactivity, external influence, interpersonal influence, self efficacy, and facilitating conditions are critical factors. This study has given us a better understanding of critical mobile communication factors in improving user acceptance of m-government services. Implications and recommendations for research and practice are also presented and discussed.     

Isokinetic Torque in Boys and Girls Ages 7 to 13: Effect of Age,Height, and Weight

The purpose of this study was to investigate torque differences between 28 boys and 28 girls, ages 7 to 13 years, for the knee and elbow flexor and extensors at 30°/second and 120°/second using an isokinetic procedure (Cybex II). In addition, the relationships of these torque levels to size and age were determined. The results revealed significant (p < .05) sex differences for the knee flexor and extensor torque values at 120°/second independent of body weight. That is, the boys generated 29.2 and 39.5 foot pounds vs. the girl's 26.2 and 35.4 foot pounds for knee flexion and extension, respectively. Similarly, torque differences (p < .05) between boys and girls were present for elbow extension at 120°/second when adjusting for differences in height. When examining the flexion/extension ratios, it is apparent that increases in body size (height, weight) and age had a significant effect on the ratio at 120°/second but not at 30°/second.     

披碱草属6种植物的核型研究

本文首次报道特产于我国青藏高原披碱草属Elymus的6种植物的染色体数目和核型。6个种的染色体数目为2n＝42，都是6倍体。它们的核型是：黑药鹅观草，2n=6x＝42=32m+10sm;糙毛鹅观草，2n=6x=42=34m+8sm；大颖鹅观草，2n=6x=42=30m+12sm；疏花鹅观，2n=6x=42=32m+10sm；青海鹅观草，2n=6x= 42＝34m十8sm；长颖鹅观草，2n=6x＝42=34m十8sm。它们的核型属1B或2B型，染色体中均未发现随体。     

Development of a Measure to Assess Youth Self-reported Experiences of Activity Settings (SEAS)

There is a need for psychometrically sound measures of youth experiences of community/home leisure activity settings. The 22-item Self-Reported Experiences of Activity Settings (SEAS) captures the following experiences of youth with a Grade 3 level of language comprehension or more: Personal Growth, Psychological Engagement, Social Belonging, Meaningful Interactions, and Choice & Control. Forty-five youth aged 14–23 years (10 with severe disabilities) completed the SEAS in 160 leisure activity settings. The SEAS has good to excellent internal consistency (Cronbach’s alpha from 0.71 to 0.88) and moderate test–retest reliability (mean scale intra-class correlation coefficient = 0.68), as expected due to changes in activity settings over time. The SEAS was able to differentiate various types of activity settings and participation partners. The SEAS can be used to gain greater understanding of situation-specific experiences of youth participating in various types of recreation and leisure activity settings, including youth with different types of disabilities and those without disabilities.