Evaluation of a resilience intervention to enhance coping strategies and protective factors and decrease symptomatology

OBJECTIVE: In this pilot study, the authors examined the effectiveness of a 4-week resilience intervention to enhance resilience, coping strategies, and protective factors, as well as decrease symptomatology during a period of increased academic stress. PARTICIPANTS AND METHODS: College students were randomly assigned to experimental (n = 30) and wait-list control (n = 27) groups. The experimental group received a psychoeducational intervention in 4 two-hour weekly sessions. Measures of resilience, coping strategies, protective factors, and symptomatology were administered pre- and postintervention to both groups. RESULTS: Analyses indicated that the experimental group had significantly higher resilience scores, more effective coping strategies (i.e., higher problem solving, lower avoidant), higher scores on protective factors (i.e., positive affect, self-esteem, self-leadership), and lower scores on symptomatology (i.e., depressive symptoms, negative affect, perceived stress) postintervention than did the wait-list control group. CONCLUSIONS: These findings indicate that this resilience program may be useful as a stress-management and stress-prevention intervention for college students.     

Simple moment-based inferences of generalized concordance correlation

We proposed two simple moment-based procedures, one with (GCCC1) and one without (GCCC2) normality assumptions, to generalize the inference of concordance correlation coefficient for the evaluation of agreement among multiple observers for measurements on a continuous scale. A modified Fisher's Z-transformation was adapted to further improve the inference. We compared the proposed methods with U-statistic-based inference approach. Simulation analysis showed desirable statistical properties of the simplified approach GCCC1, in terms of coverage probabilities and coverage balance, especially for small samples. GCCC2, which is distribution-free, behaved comparably with the U-statistic-based procedure, but had a more intuitive and explicit variance estimator. The utility of these approaches were illustrated using two clinical data examples.     

Conceptualization and measurement of the spiritual and psychological dimensions of wellness in a college population

Wellness is commonly conceptualized as having many dimensions, but little effort has been made to evaluate how spiritual and psychological dimensions are related to overall wellness. To explore the relationship between measures of spiritual and psychological wellness and perceived wellness in a college student population, the authors administered a series of survey instruments to 112 undergraduate students under quiet classroom conditions. They used the Life Attitude Profile to measure spiritual wellness, the Life Orientation Test and the Sense of Coherence Scale to measure psychological wellness, and the Perceived Wellness Survey to measure overall wellness. Path analysis performed with a proposed theoretical model revealed that the effect of life purpose on perceived wellness was mediated by optimism and sense of coherence, which had independent effects on perceived wellness beyond that of life purpose. The findings suggested that an optimistic outlook and sense of coherence must be present for life purpose to enhance a sense of overall well-being.     

A resample-replace lasso procedure for combining high-dimensional markers with limit of detection

In disease screening, a biomarker combination developed by combining multiple markers tends to have a higher sensitivity than an individual marker. Parametric methods for marker combination rely on the inverse of covariance matrices, which is often a non-trivial problem for high-dimensional data generated by modern high-throughput technologies. Additionally, another common problem in disease diagnosis is the existence of limit of detection (LOD) for an instrument – that is, when a biomarker''s value falls below the limit, it cannot be observed and is assigned an NA value. To handle these two challenges in combining high-dimensional biomarkers with the presence of LOD, we propose a resample-replace lasso procedure. We first impute the values below LOD and then use the graphical lasso method to estimate the means and precision matrices for the high-dimensional biomarkers. The simulation results show that our method outperforms alternative methods such as either substitute NA values with LOD values or remove observations that have NA values. A real case analysis on a protein profiling study of glioblastoma patients on their survival status indicates that the biomarker combination obtained through the proposed method is more accurate in distinguishing between two groups.     

Framing Effects in Narrative and Non‐Narrative Risk Messages

Narrative messages are increasingly popular in health and risk campaigns, yet gain/loss framing effects have never been tested with such messages. Three experiments examined framing in narrative messages. Experiment 1 found that only the character's decision, not framing, influenced judgments about characters in a narrative derived from a prospect theory context. Experiment 2 found that a framing effect that occurred when presented in a decision format did not occur when the same situation was presented as a narrative. Using a different story/decision context, Experiment 3 found no significant difference in preference for surgery over radiation therapy in a narrative presentation compared to a non‐narrative presentation. The results suggest that health and risk campaigns cannot assume that framing effects will be the same in narrative messages and non‐narrative messages. Potential reasons for these differences and suggestions for future research are discussed.     

The influence of the modality of telecooperation on performance and workload

Current industrial processes often involve the collaboration of people at distant and remote locations. The technological media for such a tele-cooperation reach from simple email or text-based chatting systems to highly-sophisticated systems for an interactive video-conferencing. But with limited bandwidth the communication between persons at distant locations is often restricted to single modalities. Although this may still be suitable for some tasks, it may result into serious shortcomings and decreased performance with complex tasks like cooperative assembly or maintenance. This is because restricted communication reduces the availability of a common ground, i.e. sharing a common understanding of knowledge, opinions, and goals. The study presented in this paper examines the effect of different communication media on performance of a collaborative assembly task. The results show that tele-cooperation leads to additional verbal communication (AM(direct)=71.1s; AM(video)=145.6s; AM(audio)=204.7s) and, thus, longer times to complete the task (AM (direct)=45.95 min; AM (video)= 50.2 min; am AM(audio)=56.16 min). The percentage of relative speech duration also increases significantly. Workload measurement with NASA-TLX did not show any significant differences between cooperation modes. The results allow estimating the effect of reduced communication modalities on time to complete an assembly task. This facilitates a quantification of temporal requirements in time-critical maintenance and repair tasks.     

Subjective and objective evaluation of sense of space for vehicle occupants based on anthropometric data

At present, the number of the vehicle requirements has been continuously increasing. These requirements can be related to the customer as well as the technical requirements. Among these, the "feeling of space" of the occupants inside the vehicles can be regarded as one of the most important factors. In this respect, the driver and passengers should be able to experience positive feeling of space inside the vehicle. There are numerous factors that can influence the sense of space inside the vehicle. These include geometry (vehicle dimensions), light exposure, ambient lights, colors, material selection and material surface. Depending on the selection, the sense of space can be dramatically influenced by these factors. In general, human feeling is subjective and cannot be measured by any instrument. The measure can nevertheless be carried out by utilizing the method of subjective evaluation. Throughout the experiments, the method of evaluation is developed and the factors which can influence the interior feeling are analyzed. In this process, psychological perception, architectural aspects and anthropometry are considered and knowledge from the other domains is transferred in the form of a multidisciplinary approach. The experiments with an aim to evaluate the overall sense of space in the vehicle are carried out based on the physical mock up of BMW 1 series (E87). The space perception with different interior dimensions and anthropometric data of test persons are also analyzed. The use of Computer Aided Technology was shown by CATIA V5, PCMAN and RAMSIS. The results show a good correlation between the subjective evaluation and the geometric values.     

Dynamic pricing with strategic customers

This paper provides an overview of the literature on dynamic pricing with strategic customers. In the past, research on dynamic pricing was mostly concerned with optimally pricing products over time in a market with myopic customers. In recent years, the consideration of strategic customers, who can delay a purchase to take advantage of a future discount, has dramatically increased. This paper’s main contribution is the development of a comprehensive classification scheme to structure the field of research and, based upon this, a systematic overview of all relevant papers. We then present in detail the various aspects considered in the literature together with their motivation from industry and state the major findings of the most relevant papers. Further attention is given to important problem extensions proposed in the literature that have been considered in only a few papers and are usually motivated by specific practical applications. Finally, promising directions for future research are indicated.