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排序方式: 共有84条查询结果,搜索用时 15 毫秒
41.
This paper presents a model for the expansion of transportation networks incorporating specific requirements about population coverage, budget constraints, intermediate goals and origin–destination flows, among others. The model is applicable to the current expansion project of the Spanish high-speed railway network that has been proposed by the Spanish Government under the program Strategic Planning of Infrastructure and Transport (see source [c]). 相似文献
42.
This study investigated college students' reports of electronic victimization in friendships and dating relationships. We examined 22 items representing four categories of electronic victimization: hostility, humiliation, exclusion, and intrusiveness. Nearly all participants (92%) reported some electronic victimization in the past year, with males reporting more victimization and females anticipating more distress. Both females and males anticipated more distress from electronic victimization in dating relationships than friendships. More actual experience with electronic victimization related to lower anticipated distress. Electronic victimization was associated with females' alcohol use, even after controlling for other victimization experiences. Discussion focuses on the contextualized nature of electronic victimization, and on the importance of understanding what makes electronic victimization highly distressing for some individuals. 相似文献
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44.
Force exertion is related to low back injuries (LBI). This paper critically reviews the literature concerning cut-points for back force exertion, presents available guidelines in a concise manner, and identifies areas that need further research. The studies reviewed were grouped according to the criteria used to set the cut-point values. Most often cut-points differ than concur. The approach considering physiological, psychophysical, epidemiological, and biomechanical aspects of back force exertion meets the most known criteria and presents the lowest common denominator of instantaneous load for lifting tasks. Further experimental and epidemiological studies in peak load and cumulative exposure are necessary. Compound indices should also be developed for pushing, pulling, and carrying. Future indices should consider electromyographically determined fatigue, differential viscoelastic properties of tissues, aging, and the cross sectional area of back muscles. We hope that this paper contributes to a more systematic appraisal of back force exertion at work. 相似文献
45.
Morais Manuel Cabral Schmid Wolfgang Ramos Patrícia Ferreira Lazariv Taras Pacheco António Semeniuk Ivan 《AStA Advances in Statistical Analysis》2019,103(2):289-303
AStA Advances in Statistical Analysis - In the original paper, we incorrectly stated that... 相似文献
46.
Pedro L. Ramos Jorge A. Achcar Fernando A. Moala Eduardo Ramos Francisco Louzada 《Statistics》2017,51(4):824-843
The Generalized gamma (GG) distribution plays an important role in statistical analysis. For this distribution, we derive non-informative priors using formal rules, such as Jeffreys prior, maximal data information prior and reference priors. We have shown that these most popular formal rules with natural ordering of parameters, lead to priors with improper posteriors. This problem is overcome by considering a prior averaging approach discussed in Berger et al. [Overall objective priors. Bayesian Analysis. 2015;10(1):189–221]. The obtained hybrid Jeffreys-reference prior is invariant under one-to-one transformations and yields a proper posterior distribution. We obtained good frequentist properties of the proposed prior using a detailed simulation study. Finally, an analysis of the maximum annual discharge of the river Rhine at Lobith is presented. 相似文献
47.
S. L. Prince Nelson V. Ramakrishnan P. J. Nietert D. L. Kamen P. S. Ramos B. J. Wolf 《统计学通讯:理论与方法》2017,46(21):10823-10834
Dichotomization of continuous variables to discriminate a dichotomous outcome is often useful in statistical applications. If a true threshold for a continuous variable exists, the challenge is identifying it. This paper examines common methods for dichotomization to identify which ones recover a true threshold. We provide mathematical and numeric proofs demonstrating that maximizing the odds ratio, Youden’s statistic, Gini Index, chi-square statistic, relative risk and kappa statistic all theoretically recover a true threshold. A simulation study evaluating the ability of these statistics to recover a threshold when sampling from a population indicates that maximizing the chi-square statistic and Gini Index have the smallest bias and variability when the probability of being larger than the threshold is small while maximizing Kappa or Youden’s statistics is best when this probability is larger. Maximizing odds ratio is the most variable and biased of the methods. 相似文献
48.
M. J. Mustafa D. Caspersz H. M. L. Ramos C. M. M. Siew 《Human Resource Development International》2018,21(3):163-185
Most family businesses employ more non-family employees than family employees, making them a crucial resource for family small-to-medium enterprises (SMEs). Thus, family SMEs must pay particular attention to developmental needs of such employees. However, there is limited empirical knowledge concerning how Family SMEs can manage and develop their non-family employees. Drawing on organizational justice theory, this study set out to investigate how and why non-family employees are satisfied with the High Involvement HR practices (HIHRPs) adopted by family SMEs. Empirical evidence was drawn from the experiences of 16 non-family employees from six SME family-owned enterprises. Findings suggest that a balance between formal and informal HIHRPs is need among family SMEs for non-family employees to be satisfied with them. Moreover, satisfaction with both formal and informal HIHRPs can encourage non-family employees’ engagement with the enterprise and the development of their skills and capabilities. Findings also suggest that the satisfaction with HIHRPs varies with respect to the organizational positioning of non-family employees. Our findings make a valuable and timely contribution to the human resource development and SME literatures in general. 相似文献
49.
This study aims to analyze the factors that justify the low use of a mechanical transfer in the context of a long-term institution. It is a device intended for internal transportation of individuals who have mobility problems. The analysis involves researchers from the fields of health and engineering in order to generate design criteria that consider the needs of caregivers and patients of this institution. To understand the reality of this site and their specificities, was used Ergonomic Work Analysis. 相似文献
50.
Domestic violence is a serious issue for U.S. Latinas. Better understanding of the potential risk or protection that cultural perceptions about what constitutes domestic violence may convey can help strengthen interventions. Therefore, a convenience sample of 93 Latinas was surveyed about their current levels of domestic violence victimization, acculturation, and demographics, as well as about whether 5 behavioral scenarios constituted domestic violence. Hierarchical multiple regressions were performed to examine the relationships between the 5 perception items and domestic violence victimization. After adjusting for established risk factors, only viewing male partner stalking and female verbal aggression as domestic violence were significantly associated with decreased domestic violence victimization. Findings can be integrated into the development and implementation of culturally competent interventions targeting Latinas. 相似文献