What does a motorcyclist look at while driving at urban arterials?

To design adequate measures for enhancing riders' safety, a necessary first step is to understand the riders' visual scanning strategies under different traffic conditions. This paper presents the preliminary analysis of eye tracking data collected by three riders in the Athens metropolitan area, riding along urban arterial motorways and along an undivided urban road. Apart from the fixation duration and location, the fixated road elements and specific objects were annotated and analysed. The mean duration of fixations was found to be higher on urban roads than on motorways for all traffic densities. Riding in the condition of restricted flow seems to be more demanding for the riders, since the mean duration of fixations was higher in restricted flow than in free or congested flow on motorway and also higher than in free flow on urban road. The riders' fixation locations differed between motorway and urban road, especially in the vertical plane. The analysis of fixated road elements and specific objects indicates the specific points of interest of riders in each case. Although results should be validated with data from more riders, they provide hints on direction of future research efforts to enhance riders' safety in urban environments.     

Semantic analysis of natural language processing in a study of nurse mobility in the Northern Territory,Australia

In lieu of diverse consequences in the demand and supply of health care professionals such as nurses and midwives in Australia and the world, a firm understanding of the characteristics of staff mobility and the factors influencing their retention could lead to achieving enhanced service delivery, greater job satisfaction, and the establishment of a more stable and robust workforce. The research reported in this paper attempts to shed light on qualitative aspects of mobility in health care professional staff in the Northern Territory of Australia. It builds upon an existing survey study of the quantitative factors that determine why nurses and midwives come to the Northern Territory, why some stay and why many leave, by analysing additional qualitative textual responses of participants using semantic network approaches to natural language processing. Our results illustrate the methodological and policy significance of semantic approaches to knowledge acquisition and representation, especially in complementing findings of traditional survey analysis techniques, and in analysing the broader social settings, effects and consequences of staff retention and mobility.     

Inter-organizational governance: a review,conceptualisation and extension

Abstract

Although the concepts of relational and contractual governance in inter-organizational relationships have attracted academic and practitioner interest over the last decades, to date there have been limited comprehensive and systematic efforts to review, analyse and synthesise extant literature. We review and analyse 1,415 publications identified from a wide range of management disciplines and journals from 1990 to 2018. We deploy bibliographic and content analyses to offer a comprehensive literature analyses and synthesis and subsequently develop and position a multidimensional framework of exchange governance. The proposed framework covers existing conceptualisations of exchange governance and its diverse mechanisms, environmental dimensions influencing the use of exchange governance mechanisms and performance implications. We uncover areas that are currently under-studied and draw out fruitful future research avenues.     

Investigating the association between callous‐unemotional traits with relational bullying and victimization: A cross‐national study

Prior research supports an association between callous‐unemotional (CU) traits with relational bullying, but evidence associating CU traits with relational victimization is limited. Further, the relationship between CU traits with relational “bully,” “bully‐victim,” and “victim” classifications has been largely neglected. The current study addresses these critical gaps in the literature using a cross‐national study design. The sample comprised of 1887 (51.5% of girls) Greek and Cypriot children (MAge = 11.17) who completed a battery of self‐report measures. Group differences suggested that children in the relational bully and bully‐victim groups scored higher on CU traits compared to children in the victim and low‐risk groups. Although these associations were similar across countries, boys in Greece were more likely to be identified in the bullying only group. In contrast, boys in Cyprus represented the higher percentage identified as bully‐victims and girls in Cyprus represented the higher percentage identified as victim‐only. Regression analysis results indicated that CU traits predicted relational bullying but not victimization. Notwithstanding, other important unexamined factors known to contribute to relational bullying and victimization, our findings suggest that prevention efforts should consider CU traits in order to protect youth from relational bullying. However, differences between countries and gender should also be taken into account.     

Kalman filtering with censored measurements

This paper concerns Kalman filtering when the measurements of the process are censored. The censored measurements are addressed by the Tobit model of Type I and are one-dimensional with two censoring limits, while the (hidden) state vectors are multidimensional. For this model, Bayesian estimates for the state vectors are provided through a recursive algorithm of Kalman filtering type. Experiments are presented to illustrate the effectiveness and applicability of the algorithm. The experiments show that the proposed method outperforms other filtering methodologies in minimizing the computational cost as well as the overall Root Mean Square Error (RMSE) for synthetic and real data sets.     

Contract functions in service exchange governance: evidence from logistics outsourcing

The logistics outsourcing literature emphasises relational governance mechanisms and has underplayed the role of formal contractual provisions. This paper empirically examines the multiple functions that contracts perform in the governance of service exchanges. Codification, safeguarding, coordination and adaptation functions are linked to contract specification schedules, payment mechanisms, (early) termination rights, performance review and communication provisions, service variations clauses and renegotiation provisions. Contracts may also embody exchange- or partner-specific learning, albeit to a limited extent. Overall, the empirical findings lend support to the functional view of contracting. The functionality of contracts extends beyond safeguarding against opportunism and financial losses. In addition to offering economic and legal safeguards, contracts are used to coordinate and adapt service exchanges in the face of complexity and uncertainty.     

The Mean Squared Error of the Instrumental Variables Estimator When the Disturbance Has an Elliptical Distribution

This paper generalizes Nagar's (1959) approximation to the finite sample mean squared error (MSE) of the instrumental variables (IV) estimator to the case in which the errors possess an elliptical distribution whose moments exist up to infinite order. This allows for types of excess kurtosis exhibited by some financial data series. This approximation is compared numerically to Knight's (1985) formulae for the exact moments of the IV estimator under nonnormality. We use the results to explore two questions on instrument selection. First, we complement Buse's (1992) analysis by considering the impact of additional instruments on both bias and MSE. Second, we evaluate the properties of Andrews's (1999) selection method in terms of the bias and MSE of the resulting IV estimator.     

The Material Intensity of Growth: Implications from the Human Scale of Production

Contemporary empirical studies on the resource intensity of the economic process provide evidence of a gradual de-linking between natural resources use and economic growth. Resource intensity is evaluated through the Domestic Material Consumption/Gross Domestic Product (DMC/GDP) ratio, defined as the material intensity index. Trajectories of this ratio support the optimistic view that economic output is becoming progressively less dependent on resource flows, hence GDP is gradually dematerialized. The present study asserts that the DMC/GDP indicator fails to take into account the biophysical properties of the production process which define the resource requirements of the economy. The present study proposes the “resources required for producing one unit of GDP per Capita (Income)”, as an alternative indicator for evaluating the resource requirements of the economy. The resource requirement, evaluated at the level of income, approximates the human scale of production; goods should embody certain biophysical properties in order to satisfy human needs. The trajectories of DMC/Income index for global growth rejects the vision of a dematerialized growth and the de-linkage of the economy from natural resources.