Bound and exact methods for assessing link vulnerability in complex networks

Assessing network systems for failures is critical to mitigate the risk and develop proactive responses. In this paper, we investigate devastating consequences of link failures in networks. We propose an exact algorithm and a spectral lower-bound on the minimum number of removed links to incur a significant level of disruption. Our exact solution can identify optimal solutions in both uniform and weighted networks through solving a well-constructed mixed integer program. Also, our spectral lower-bound derives from the Laplacian eigenvalues an estimation on the vulnerability of large networks that are intractable for exact methods. Through experiments on both synthetic and real-world networks, we demonstrate the efficiency of the proposed methods.     

A New Family of BAN Estimators for Polytomous Logistic Regression Models based on ϕ- Divergence Measures

In this paper we study polytomous logistic regression model and the asymptotic properties of the minimum ϕ-divergence estimators for this model. A simulation study is conducted to analyze the behavior of these estimators as function of the power-divergence measure ϕ_(λ) Research partially done when was visiting the Bowling Green State University as the Distinguished Lukacs Professor     

POST-REFORM INDUSTRIAL PRODUCTIVITY PERFORMANCE OF CHINA: NEW EVIDENCE FROM THE 1985 INDUSTRIAL CENSUS DATA

Beginning in the late 1970s, a series of reforms to improve industrial productivity were implemented in China. We estimate changes in productivity growth and identify its sources in the post-reform period 1980-85. Our work is based on the newest and most comprehensive data set available on Chinese industrial activities. Productivity growth estimates are shown to be strongly affected by output specification. Overall, we find sharp increases in productivity growth in the 1984-85 period as compared to the 1980-84 period. Collective and private enterprises show higher output and productivity gains than do state-owned enterprises.     

“I Am Tired But If I Don't Try to Have Sex,My Wife Will Think I've Been Fooling around in the City”: Work,Migration, and Sex Among Vietnamese Migrant Laborers

Mostly operating from a risk and risk-reduction paradigm, existing research on migrants in Vietnam tends to conceptualize sex and risky sexual behaviors as isolated life domains. This study begins to develop a contextually rich understanding of migrants’ sex lives by examining the relationships among sex, work, and the constant pendulum-like migrating movements of 23 Vietnamese married migrants in Hanoi and Ho Chi Minh City. Using data from in-depth interviews, it was found that most participants had no sex in the city; this was followed by visits to the home village, where they had sex with their spouses as often as possible to make up for the “long drought” in the city. Within this sexual schema, sex came secondary, and even peripherally, to migrants’ working lives; thus, exhaustion from work was cited by migrants as the overwhelming factor leading to their sexual problems. This study suggests that migrants’ intimate lives are more strongly linked to their working lives than has previously been recognized, and that their sexual behaviors should be viewed in tandem with the hardships of their working lives.     

Validation of multidimensional scale of perceived social support in middle-aged Korean women with diabetes

Purpose: The purpose of this study was to validate the Multidimensional Scale of Perceived Social Support (MSPSS) among middle-aged Korean women with type 2 diabetes. Methods: Data were collected from 123 middle-aged Korean women with diabetes. Construct and concurrent validity were examined using factor analysis. Results: Factor analysis extracted three factors: spouse, family, and friends. The MSPSS had relatively good concurrent validity (r = .66, p < .0001), construct validity, and strong reliability (Cronbach's alpha = .90). Conclusion: We concluded that the MSPSS is a simple and well-established instrument to measure social support in middle-aged Korean women with diabetes.     

The commonalities and differences in health professionals’ views on home birth in Tasmania,Australia: A qualitative study

ObjectivesHome birth has attracted great controversy in the current context. There is a need for the public and health professionals to understand why maternity care providers have such different views on home birth, why they debate, what divides them into two opposite sides and if they have anything in common.MethodA qualitative study involving twenty maternity health providers in Tasmania was conducted. It used semi-structured interview which included closed and open-ended questions to provide opportunities for exploring emerging insights from the voices of the participants.FindingsHealth practitioners who support home birth do so for three reasons. Firstly, women have the right to choose the place of birth. Secondly, home birth may be more cost effective compared to hospital birth. Thirdly, if home birth is not supported, some women might choose to have a free birth. Those who opposed home birth argue that complications could occur at childbirth and the transfer time is critical for women's and babies’ safety. These differences in opinions can be due to the differences in the training and philosophy of the maternity care providers. Despite the differing views on home births, health professionals share a common goal to protect the women and the newborns from unexpected situations during childbirth.ConclusionThis article provides some significant insights derived from the study of home birth from the maternity health professionals’ perspectives and could contribute to the enhancement of mutual understanding and collaboration of health professionals in their services to expectant mothers.     

The inverse 1-center problem on trees with variable edge lengths under Chebyshev norm and Hamming distance

This paper addresses the problem of modifying the edge lengths of a tree in minimum total cost such that a prespecified vertex becomes the 1-center of the perturbed tree. This problem is called the inverse 1-center problem on trees. We focus on the problem under Chebyshev norm and Hamming distance. From special properties of the objective functions, we can develop combinatorial algorithms to solve the problem. Precisely, if there does not exist any vertex coinciding with the prespecified vertex during the modification of edge lengths, the problem under Chebyshev norm or bottleneck Hamming distance is solvable in \(O(n\log n)\) time, where \(n+1\) is the number of vertices of the tree. Dropping this condition, the problem can be solved in \(O(n^{2})\) time.     

CONSER Updates: The Serials Cataloging Cooperative Training Program at Ten Years and Revision of Integrating Resources: A Cataloging Manual

Abstract

In this column, CONSER specialist Hien Nguyen recognizes the ten-year anniversary of the Serials Cataloging Cooperative Training Program. She discusses program successes, including the development of new material for Web delivery. CONSER coordinator Les Hawkins gives an update on the revision of Integrating Resources: A Cataloging Manual, the basic documentation used by CONSER and BIBCO members to create and maintain records for integrating resources.     

Biodiversity,coastal protection and resource endowment: Policy options for improving ocean health

The paper develops a production function for the Global Ocean Health Index (OHI) for 2013. Data from the Ocean Health Statistics, plus from the Human Development Index (HDI) for 151 countries are used. We employ two-stage regression model to conduct this evaluation. The Tobit model, used to obtain the estimated dependent variable, results show Coastal Protection, Livelihoods and Economies, Tourism and Recreation, Iconic Species, Clean Water and Biodiversity, Food Provision, Artisanal Fisheries Opportunities, Natural Products, and Carbon Storage are significant variables. The rank regression in the second stage showed that HDI and Marine Protected Areas (MPAs) significantly influenced the predicted value of the OHI. Policy makers should note that biodiversity increases have the greatest effect on OHI, and its improvement is within reach of even the poorest country. Countries with varying levels of resource endowment may choose different techniques to improve OHI, but the implementation of MPAs should be priority.