A new metamodel-based method for solving semi-expensive simulation optimization problems

In this article, a new algorithm for rather expensive simulation problems is presented, which consists of two phases. In the first phase, as a model-based algorithm, the simulation output is used directly in the optimization stage. In the second phase, the simulation model is replaced by a valid metamodel. In addition, a new optimization algorithm is presented. To evaluate the performance of the proposed algorithm, it is applied to the (s,S) inventory problem as well as to five test functions. Numerical results show that the proposed algorithm leads to better solutions with less computational time than the corresponding metamodel-based algorithm.     

Inverse Dynamic Data Envelopment Analysis for Evaluating Faculties of University with Quasi-Fixed Inputs

Social Indicators Research - Like other organizations, universities must evaluate their performance to identify areas for improvement. Although the different aspects of a university are considered...     

Is Tunisian Real Effective Exchange Rate Mean Reverting? Evidence from Nonlinear Models

This paper investigates mean reversion in the deviation of Tunisian real effective exchange rate (REER) from its fundamental value. This paper uses the smooth transition auto-regression (STAR) methodology advocated by Granger and Teräsvirta (1993) in order to test whether the Tunisian REER is mean reverting over the period 1990:01 to 2010:01. The empirical results show that data support the hypothesis that deviations can be characterized by asymmetric responses towards appreciation and depreciation with the speed of transition between the expansion and contraction regimes being relatively high. The research results have both methodological and practical originality. On the practical side, the main policy implications the paper puts forward are that foreign exchange market participants should adopt the LSTAR model rather than ESTAR model in their attempt to effectively comprehend the behavior of the exchange rates. On the methodological side, this study makes use of robust test for STAR type nonlinearity. This procedure has been deemed immune against outliers and does not need a priori knowledge regarding their presence and/or timing.     

Unsettling Spaces: Grassroots Responses to Canada’s Missing and Murdered Indigenous Women During the Harper Government Years

Abstract

In Canada, Indigenous women and girls are 4.5 times more likely to become victims of homicide than other women. Over the last 30 years, more than 1000 women identified as First Nations, Inuit, or Métis were murdered in Canada, and more than 100 are still missing. However, the Canadian government has not acknowledged the economic, social and environmental colonialism that has allowed this violence to become naturalised. Focusing on activism around the crisis of missing and murdered Indigenous women, girls, and Two-Spirit people in Canada during the years of the Conservative Harper Government, this article examines how these grassroots initiatives challenge Canadian politics, reclaim streets and liminal zones, and make space for sacred commemoration. Specifically, Twitter campaigns, memeing, the REDress Project, and Walking With Our Sisters are studied. Engaging with scholarship that analyses spaces of violence, this article, in turn, discusses how activism can disrupt violence by transforming physical, virtual and affective spaces.     

The relationship between environmental exposures and hormonal abnormalities in pregnant women: An epidemiological study in Yazd,Iran

Problem

The process of industrialization and lifestyle changes have gradually exposed human ?societies to a larger number of environmental risk factors, which may cause hormonal ?abnormalities and congenital anomalies.

Internal and External Factors of Plagiarism: Evidence from Chinese Public Sector Universities

This study explores the effects of internal and external factors that encourage plagiarism from the perspective of students. We collected student data from five public sector universities in Anhui Province, China, by randomly distributing survey questionnaires to 250 students, 176 of which were usable. We analyzed the collected quantitative data through multiple regression analysis. Our research results demonstrate that external and internal factors have a great influence on plagiarism. The control behavior and teaching factors have a significantly positive impact on plagiarism, while ICT and web does not have a considerable impact on plagiarism. Among the external factors, a significant positive correlation exists between external stress, pride, and plagiarism; however, no significant relationship exists between academic skills and plagiarism. The article concludes that grade level and enrollment status (full-time or part-time) are inversely correlated to plagiarism, which proves that the higher the academic level, the less the plagiarism behaviors occur. This concept may be due to the fact that the higher the academic level, the stronger the plagiarism constraints might be, which in turn leads to a drastic decrease in plagiarism. Moreover, a negative relationship emerges between enrollment status (full-time or part-time) and plagiarism because part-time students who are committed to employment are less likely to give their full attention to their studies.     

Disrupting 21st-Century In/Security

Abstract

This thematic issue probes into twenty-first-century security concerns in the United States, Canada and Mexico, and their transnational implications. In particular, it explores three tensions that characterise contemporary security concerns: national security vs. human security, policy measures vs. grassroots activism and scholarly discourses vs. artistic interventions. The 'War on Terror' launched by President George W. Bush marked the beginning of the century with issues of violence and insecurity, with major human rights ramifications. Grassroots activists, however, have resisted the imposition of security policy and stood up to the insecurities they face. This thematic journal issue discusses questions of in/security around a robust people-centred framework that delineates questions of insecurity as a complex nexus that intertwines policy-making, everyday experiences, cultural representations and formal and informal communication networks. This focus presents an alternative to more conventional approaches that examine issues of societal in/security solely from the viewpoint of nation states and law enforcement. The collection’s case studies address the ways in which ordinary people in a transnational North American context experience questions of insecurity. The articles highlight the central position of gender, race, class and sexuality in both strengthening and challenging danger, uncertainty and liminality.