Parallel sequential Monte Carlo for stochastic gradient-free nonconvex optimization

Statistics and Computing - We introduce and analyze a parallel sequential Monte Carlo methodology for the numerical solution of optimization problems that involve the minimization of a cost...     

Foreign Employers as Relief Routes: Women,Multinational Corporations and Managerial Careers in Japan

This article argues that multinational corporations may provide critical relief routes for women workers' progress in managerial careers in national contexts where their career paths with domestic employers remain blocked by traditional and institutional practices. It illustrates this possibility through a study of two women managers at the local head office of a foreign‐owned multinational retailer in Japan and their career trajectories. The alternative career paths through foreign employers are not without their contingencies and constraints, and the article identifies the limitations of the transformative potential foreign employers could have in the larger realm of women's managerial employment in a restrictive context such as Japan. Noting that globalization incorporates different groups of workers into the global economy with different costs and rewards, the article concludes by calling for a more nuanced understanding of women's employment with multinationals and for further research that remains cognizant of the multiplicity of experiences in different contexts.     

Description and Propagation of Uncertainty in Input Parameters in Environmental Fate Models

Today, chemical risk and safety assessments rely heavily on the estimation of environmental fate by models. The key compound‐related properties in such models describe partitioning and reactivity. Uncertainty in determining these properties can be separated into random and systematic (incompleteness) components, requiring different types of representation. Here, we evaluate two approaches that are suitable to treat also systematic errors, fuzzy arithmetic, and probability bounds analysis. When a best estimate (mode) and a range can be computed for an input parameter, then it is possible to characterize the uncertainty with a triangular fuzzy number (possibility distribution) or a corresponding probability box bound by two uniform distributions. We use a five‐compartment Level I fugacity model and reported empirical data from the literature for three well‐known environmental pollutants (benzene, pyrene, and DDT) as illustrative cases for this evaluation. Propagation of uncertainty by discrete probability calculus or interval arithmetic can be done at a low computational cost and gives maximum flexibility in applying different approaches. Our evaluation suggests that the difference between fuzzy arithmetic and probability bounds analysis is small, at least for this specific case. The fuzzy arithmetic approach can, however, be regarded as less conservative than probability bounds analysis if the assumption of independence is removed. Both approaches are sensitive to repeated parameters that may inflate the uncertainty estimate. Uncertainty described by probability boxes was therefore also propagated through the model by Monte Carlo simulation to show how this problem can be avoided.     

Computer support for continuous improvements

Abstract. The view of manufacturing has changed in recent years. This is evident from how the focus of management's attention is shifting more and more towards the basics of operating the business. The challenge to manufacturers in the West today is how to introduce leaner practices in their operations. The objective of this paper is to demonstrate how computer technology and information systems can be applied to support the transition to leaner practices in a complex operation. The problem with the large information systems developed to manage the complex operations of many Western companies is that they were designed to help maintain performance and not to support finding opportunities for new improved practices. Results from the ESPRIT II project, CIM for Multi-supplier Operations (CMSO), show that an existing data infrastructure can be effectively utilized to develop inexpensive, customized tools to support a process of continuous improvements. In this project a set of tools for planning the material flow from supplier to the assembly line was developed for the Saab-Valmet automobile assembly plant in Uusikaupunki, Finland. Hypertext tools were used to quickly develop decision support applications that supported problem solving and finding improvement potentials.     

Walking on a Tightrope: Challenges and Opportunities for Civil Society Organizations Working with Refugees and Migrants in Turkey

VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - This qualitative study sheds light onto the working structures, make-up, and strengths and weaknesses of civil society...     

Charity Social Media Marketing and Its Influence on Charity Brand Image,Brand Trust,and Donation Intention

VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - This study aims to identify the outline of charity social media marketing (SMM) and to determine to what extent it...     

Strategy-proof resolute social choice correspondences

We qualify a social choice correspondence as resolute when its set valued outcomes are interpreted as mutually compatible alternatives which are altogether chosen. We refer to such sets as “committees” and analyze the manipulability of resolute social choice correspondences which pick fixed size committees. When the domain of preferences over committees is unrestricted, the Gibbard–Satterthwaite theorem—naturally—applies. We show that in case we wish to “reasonably” relate preferences over committees to preferences over committee members, there is no domain restriction which allows escaping Gibbard–Satterthwaite type of impossibilities. We also consider a more general model where the range of the social choice rule is determined by imposing a lower and an upper bound on the cardinalities of the committees. The results are again of the Gibbard–Satterthwaite taste, though under more restrictive extension axioms.     

Self‐Employment as a Strategy for Dealing with the Competing Demands of Work and Family? The Importance of Family/Lifestyle Motives

In this paper, we test the argument that self‐employment may be a strategy for dealing with competing demands of work and family. We do this by comparing work–family conflict experienced by self‐employed and employed men and women. By examining to what extent the self‐employed versus regularly employed value time for themselves and their family — i.e., whether they are driven by family/lifestyle motives in their working life — we examine whether self‐employment can help reduce work–family conflict among those guided by family/lifestyle motives. Using data from a 2011 Swedish survey of 2483 self‐employed and 2642 regularly employed, the analyses indicate that experiences of work–family conflict differ between self‐employed and employees. Self‐employed men and women, especially those with employees, generally experience more work–family conflict than do employees. However, self‐employment can sometimes be a strategy for dealing with competing demands of work and family life. The presence of family/lifestyle motives generally decreases the probability of experiencing work–family conflict, particularly among self‐employed women with employees.