Evasive action characteristics of motorcycle riders towards occluded-surprise and expected pedestrians: A pedestrian mock-up study

Evasive action performance of motorcycle riders plays a vital role in the prevention of road crashes. In possible conflicting scenarios, motorcycle riders need to respond quickly and perform evasive actions successfully to prevent collisions with other vulnerable road users such as crossing pedestrians. To study the motorcycle rider behavior in conflicts with occluded and visible pedestrians, we designed four mock-up pedestrian scenarios, which includes, two surprise scenarios, one stationary scenario, and one expected scenario. Riders’ responses to the conflicts were measured using instrumented vehicle’s trajectory. Most riders preferred deceleration over swerving at the beginning of the interaction, followed by swerving at manageable speeds. Further, the analysis of riders’ deceleration rates revealed that a linear relationship existed between the deceleration rates and time to collisions (TTC). The study also analyzed the riders’ responses using repeated-measures analysis of variance (RM-ANOVA) to check for the effect of scenario type on deceleration rates. Results indicated that scenario type significantly affected the mean deceleration rates. Further, RM-ANOVA analysis carried out on the jerk behavior of motorcycle riders indicated that there was a significant effect of scenario type on the jerk behavior. Motorcycle riders’ jerks varied linearly with TTC and motorcyclists employ relatively higher decelerations and jerks when faced with pedestrians emerging suddenly from occluded locations such as from the blind spots formed due to parked vehicles. This study helps in understanding motorcycle rider behavior in critical situations and shows the need for assistive evasive systems for motorcycle riders to mitigate collisions with other vulnerable road users.     

Guiding drivers towards safer driving speed: Exploiting visual dominance in speed adaptation

Inappropriate speed is a main cause of accidents. Drivers are often unaware of potential risks due to inadequate speed. To prevent dangerous situations, we need to understand perceptual factors influencing human speed perception. Due to the prominent role of vision in driving, we examined the effect of visuo-spatial stimuli on speed based on the optic flow. While developing an adaptive infrastructure measure to reduce speed, we conducted two consecutive studies, a driving simulator study and a field test to investigate findings further. In both studies, we placed lights on two sides of a highway exit and either illuminated them statically or activated them in a way that they appeared to be moving towards the driver. We expected drivers to slow down more when seeing static light stimuli compared to a baseline without lights. We also expected drivers to decrease speed more in conditions with oncoming lights compared to a baseline, and to static lights, due to distorted speed perception. The first study in a static driving simulator revealed no difference between conditions. In the field test, both static lights and lights moving towards the driver led to a speed reduction compared to a baseline but did not differ from one another. Lights in general led to lower driving speed, potentially due to their warning character, but we found no difference between the light conditions, suggesting that the effect might not be based on the optic flow. Future research should investigate the relationship between driven and perceived speed more closely.     

“We've Got Creative Differences”: The Effects of Task Conflict and Participative Safety on Team Creative Performance

Although both participative safety and team task conflict are widely thought to be related to team creative performance, the nature of this relationship is still not well understood, and prior studies have frequently yielded conflicting results. This study examines the ambiguity in the extant literature and proposes that both constructs must exist in tandem. Through a study of 55 design teams, we have identified a significant interaction between task conflict and participative safety. Results suggest that both participative safety and task conflict must exist in tandem to spur team creativity, and that team creative performance must be examined at the facet level, instead of simply as a single construct. In addition, supplemental analyses suggest that teams low on participative safety and task conflict are likely able to generate more original solutions for creative tasks due to the presence of an independent, disagreeable creative member. Implications for future research and practice are further discussed.     

Transformational Leadership and Creative Problem‐Solving: The Mediating Role of Psychological Safety and Reflexivity

Previous research has pointed to the importance of transformational leadership in facilitating employees' creative outcomes. However, the mechanism by which transformational leadership cultivates employees' creative problem‐solving capacity is not well understood. Drawing on theories of leadership, information processing and creativity, we proposed and tested a model in which psychological safety and reflexivity mediate the effect of transformational leadership and creative problem‐solving capacity. The results of survey data collected at three points in time indicate that transformational leadership facilitates the development of employees' creative problem‐solving capacity by shaping a climate of psychological safety conducive to reflexivity processes. However, the findings also indicate that psychological safety is related both directly and indirectly, through reflexivity, to employees' creative problem‐solving capacity. This study sheds further light on the ways in which transformational leaders help to develop and cultivate employees' capacity for creative problem‐solving.     

Mind Over Matter? The Role of Individual Perceptions in Understanding the Social Ecology of Housing Environments for Individuals with Psychiatric Disabilities

There is a disagreement in place‐based research regarding whether objective indicators or individual perceptions of environments are better predictors of well‐being. This study assessed environmental influences on well‐being for 373 individuals with psychiatric disabilities living independently in 66 neighborhoods in the southeastern United States. Three questions were examined utilizing random effects models: (1) How much variance in personal and neighborhood well‐being can be explained by neighborhood membership? (2) What is the relationship between participant perceptions of neighborhood quality and researcher ratings of neighborhood quality? and (3) What is the relative influence of individual perceptions, perceptions aggregated by neighborhood, and researcher ratings of neighborhood quality in predicting personal and neighborhood well‐being? Results indicate that individual perceptions of neighborhood quality were more closely related to well‐being than either aggregated perceptions or researcher ratings. Thus, participants’ perceptions of their neighborhoods were more important indicators of their well‐being than objective ratings made by researchers. Findings have implications for measurement approaches and intervention design in placed‐based research.     

Does Neighborhood Social Capital Buffer the Effects of Maternal Depression on Adolescent Behavior Problems?

Neighborhood characteristics have been shown to impact child well-being. However, it remains unclear how these factors combine with family characteristics to influence child development. The current study helps develop that understanding by investigating how neighborhoods directly impact child and adolescent behavior problems as well as moderate the influence of family characteristics on behavior. Using multilevel linear models, we examined the relationship among neighborhood conditions (poverty and social capital) and maternal depression on child and adolescent behavior problems. The sample included 741 children, age 5–11, and 564 adolescents, age 12–17. Outcomes were internalizing (e.g. anxious/depressed) and externalizing (e.g. aggressive/hyperactive) behavior problems. Neighborhood poverty and maternal depression were both positively associated with behavior problems for children and adolescents. However, while neighborhood social capital was not directly associated with behavior problems, the interaction of social capital and maternal depression was significantly related to behavior problems for adolescents. This interaction showed that living in neighborhoods with higher levels of social capital attenuated the relationship between maternal depression and adolescent behavior problems and confirmed the expectation that raising healthy well-adjusted children depends not only on the family, but also the context in which the family lives.     

扑朔迷离的转基因安全之争--转基因食品争论述评之一

自问世以来,转基因食品存在风险的观点和报道层出不穷,相关专家或机构一直争论不休。支持者认为转基因食品与非转基因食品的营养性是一样的,甚至优于传统食品,故可以安全食用;反对者则认为转基因食品对人体有过敏、致癌等风险,对机体的生殖发育、代谢等方面也有不可预期的危害,甚至对生态环境有不良影响。相对于传统食品,转基因食品需要更多的科学研究和试验,以及更加严密的监管制度和透明的公开制度。     

Workplace characteristics,career/vocation satisfaction,and existential well-being in Episcopal clergy

This study considers the association of workplace conditions with the well-being of individuals in a profession that is highly imbued with the sacred – ordained ministry. Data from 1202 Episcopal clergy were collected on measures of workplace conditions (meaningfulness; safety; and cognitive, emotional, and physical availability) along with well-being (career/vocation satisfaction, and spiritual well-being). Hierarchical OLS regression analyses indicated that workplace conditions were strong predictors of well-being. Men reported slightly higher career/vocation satisfaction, and gender also moderated the relationships between workplace conditions and well-being. The results suggest that perceived workplace conditions, such as meaningfulness, safety, and resource availability can have strong links with career satisfaction and existential well-being, especially in those occupations where work and spirit are intertwined.     

Sexual violence perceptions among Christian college students

Sexual violence is a persistent problem, both nationally and globally, with college females having an elevated risk over their non-college peers. However, there have been limited studies exploring the beliefs that specific sub-populations, such as religious groups, have about sexual violence. A central objective of this study was to provide a better understanding of student needs in order to assist administrators and student service professionals as they offer support for students in Christian higher education settings. This study was a comprehensive, exploratory survey into the attitudes and perceptions of rape myth acceptance, sexism, authoritarianism, violence, and safety, as well as occurrence of sexual violence, among Christian college students at a mid-Atlantic Christian university was conducted. The results demonstrate which concepts relate to or were predicted by students’ rape myth acceptance, as well as ascertaining similarities and differences between secular and religious colleges. Recommendations for universities, program developers, and researchers are discussed.