Cognitive and affective risk perceptions toward food safety outbreaks: mediating the relation between news use and food consumption intention

Much research on risk perception and health behavior has examined cognitive dimensions of risk but not affective dimensions. To address this gap, this study examines both cognitive risk perception (perceived risk of susceptibility and severity) and affective risk perception (worry) in the context of food safety risks in East Asia. We investigate their roles in independently and jointly predicting intention to consume outbreak-associated food products, as well as mediating the influences of news exposure and attention on intention. Data from a nationwide survey in South Korea (N = 1500) lent overall support for our hypotheses in both cases of processed food from China and seafood from Japan. Our findings show: (1) both perceived risk and worry were negatively associated with food consumption intention, and the association between perceived risk and intention was stronger among those higher in worry; (2) news attention had stronger associations with perceived risk and worry than news exposure, and attention moderated the relationship between news exposure and perceived risk; and (3) perceived risk and worry mediated the associations between news use and food consumption intention. Implications and limitations of the findings are discussed.     

A Systematic Review of Interventions for Algebraic Concepts and Skills of Secondary Students with Learning Disabilities

Improving the algebraic concepts and skills of secondary school students with learning disabilities is critical for their success in college and in the job market. This research reviewed 12 studies to examine interventions for students with learning disabilities in relation to algebraic notions and competencies. The results indicate that in regard to the Common Core State Standards for Mathematics (CCSSM) Content Standards, the majority of the studies address linear equations and expressions, linear inequalities, and quadratic expressions; they show that following interventions, students’ performance improved with respect to algebraic concepts and skills. The Tau-U and Hedges’ g of the intervention effects computed were typically large or very large. The most commonly used instructional components in the interventions were multiple representations, a sequence and/or range of examples, and explicit instruction. Limitations and suggestions for future research are discussed.     

Destruction of hexafluoroethane in a dielectric-packed bed plasma reactor

The destruction of hexafluoroethane （C2F6）, also known as R- 116, was investigated in a nonthermal plasma reactor packed with dielectric pellets. The effects of the feed gas composition and the input power on the destruction of C2F6 were examined. The feed gas composition was varied by changing the oxygen content, the argon content and the initial C2F6 concentration. An increased input power led to increased C2F6 destruction as a result of promoting the electron-molecule collisions to dissociate C2F6 molecules. The addition of argon to the feed gas greatly improved the C2F6 destruction by reducing the energy losses due to vibrational excitation and dissociation of N2 molecules, while the increases in the oxygen content and the initial C2F6 concentration decreased the destruction efficiency. The byproducts including CO2, CO, COF2, CF4, SiF4, NO2, and N2O were identified, and the destruction mechanisms were elucidated, referring to these compounds. The most abundant byproduct was found to be carbonyl fluoride （COF2）, indicating that it serves as an important medium to convert C2F6 into CO2. The energy requirement for the C2F6 destruction was in the range of 8.2-45.3 MJ/g, depending on the initial concentration.     

Testing one premise of scientific inquiry in science classrooms: Examining students' scientific explanations and student learning

In this study, we analyzed the quality of students' written scientific explanations found in notebooks and explored the link between the quality of the explanations and students' learning. We propose an approach to systematically analyzing and scoring the quality of students' explanations based on three components: claim, evidence to support it, and a reasoning that justifies the link between the claim and the evidence. We collected students' science notebooks from eight science inquiry‐based middle‐school classrooms in five states. All classrooms implemented the same scientific‐inquiry based curriculum. The study focuses on one of the implemented investigations and the students' explanations that resulted from it. Nine students' notebooks were selected within each classroom. Therefore, a total of 72 students' notebooks were analyzed and scored using the proposed approach. Quality of students' explanations was linked with students' performance in different types of assessments administered as the end‐of‐unit test: multiple‐choice test, predict‐observe‐explain, performance assessment, and a short open‐ended question. Results indicated that: (a) Students' written explanations can be reliably scored with the proposed approach. (b) Constructing explanations were not widely implemented in the classrooms studied despite its significance in the context of inquiry‐based science instruction. (c) Overall, a low percentage of students (18%) provided explanations with the three expected components. The majority of the sample (40%) provided only claims without any supporting data or reasoning. And (d) the magnitude of the correlations between students' quality of explanations and their performance, were all positive but varied in magnitude according to the type of assessment. We concluded that engaging students in the construction of high quality explanations may be related to higher levels of student performance. The opportunities to construct explanations in science‐inquiry based classrooms, however, seem to be limited. © 2010 Wiley Periodicals, Inc. J Res Sci Teach 47: 583–608, 2010     

Counting absolute numbers of items,from 1 to 8, in pigeons

Pigeons were trained in a forced choice task with four alternatives to categorize arrays consisting of 1, 3, 5, or 8 dots. Before the pigeons chose a comparison stimulus, they were required to peck each dot sequentially. A single peck to a dot, which was defined as an indicating response, changed the color of the dot so that it was differentiated from those that remained to be counted. The pigeons successfully learned to categorize the numerical arrays and then displayed transfer to novel arrays consisting of two, four, six, or seven dots, in a manner according to the order of 1 < 2 < 3 < 4 < 5 < 6 < 7 < 8. Subsequent tests revealed that the pigeons discriminated the stimuli by relying on the number of indicating responses. They also utilized multiple information (surface area, time, and other confounded events), but this was of minor significance, and after training, the pigeons were able to disregard these cues.     

Unspoken Stories by North Korean and Korean-American Educators: A Trioethnography on South Korean Education

This paper articulates the challenges of the South Korean education system through a co-constructed narrative, employing duoethnographic methodology. The authors offer critical and contextualized perspectives on their personal and professional observations on the dysfunctional aspects of South Korean education including dehumanization and overachievement. Drawing upon the framework of education for sustainable development, the authors suggest implications for educational reform both at the micro and macro, and practical and conceptual levels. This study is significant in that it considers voices of educators with socio-political backgrounds often marginalized in South Korean society.     

相互依赖视角下企业应对环境变化策略研究——以海尔集团为例

在环境不确定常态化及不确定程度提升情况下,如何应对环境变化已成为企业面临的重要问题。本文从相互依赖视角对海尔进行了案例研究,分析了企业在不同特征环境下应对环境变化的策略。研究发现,企业采用：1）高开放性模式并实施去中心化活动有助于应对高异质性环境变化;2）高严密性规则并实施建设性冲突活动有助于应对强关联性环境变化;3）高模块化模式并实施自组织建设活动有助于应对低可控性环境变化;4）高即时性规则并实施反馈循环活动有助于应对强动态性环境变化。     

Effects of different types of instructor comments in online discussions

The current study examined the effects of different types of instructor comments on student engagement in an online discussion. In particular, this study examined three comment types: (1) praise-oriented comments, agreeing with students’ initial messages and recapping their ideas, (2) elaboration-encouraging comments, requesting elaboration on the initial messages, and (3) perspective-widening comments, suggesting different or thought-provoking opinions responding to the initial messages. Seventeen graduate students enrolled in an online course were recruited. A content analysis was employed to evaluate the levels of knowledge construction. Interactivity was measured by the number of posts and idea units. The findings revealed that perspective-widening comments facilitated students’ evaluation on the peer postings and brought up diverse perspectives, contributing to knowledge construction. While elaboration-encouraging comments led to high interactivity among students, praise-oriented comments had no significant effect on the frequency of interactivity.