Identification of Protective Actions to Reduce the Vulnerability of Safety-Critical Systems to Malevolent Intentional Acts: An Optimization-Based Decision-Making Approach

An empirical classification model based on the Majority Rule Sorting (MR-Sort) method has been previously proposed by the authors to evaluate the vulnerability of safety-critical systems (in particular, nuclear power plants [NPPs]) with respect to malevolent intentional acts. In this article, the model serves as the basis for an analysis aimed at determining a set of protective actions to be taken (e.g., increasing the number of monitoring devices, reducing the number of accesses to the safety-critical system) in order to effectively reduce the level of vulnerability of the safety-critical systems under consideration. In particular, the problem is here tackled within an optimization framework: the set of protective actions to implement is chosen as the one minimizing the overall level of vulnerability of a group of safety-critical systems. In this context, three different optimization approaches have been explored: (i) one single classification model is built to evaluate and minimize system vulnerability; (ii) an ensemble of compatible classification models, generated by the bootstrap method, is employed to perform a “robust” optimization, taking as reference the “worst-case” scenario over the group of models; (iii) finally, a distribution of classification models, still obtained by bootstrap, is considered to address vulnerability reduction in a “probabilistic” fashion (i.e., by minimizing the “expected” vulnerability of a fleet of systems). The results are presented and compared with reference to a fictitious example considering NPPs as the safety-critical systems of interest.     

Differences in Adolescent Experiences of Polyvictimization and Suicide Risk by Sexual Minority Status

Sexual minority adolescents (SMA) report more suicide risk behaviors than heterosexual adolescents. Polyvictimization (co‐occurrence of multiple types of victimization) may be an important, underresearched correlate of this disparity. With the 2017 national Youth Risk Behavior Survey (N = 13,179), national estimates of polyvictimization and suicide risk were assessed among high school students by sexual minority status (SM vs. heterosexual), and multivariate relationships between sexual minority status, polyvictimization, and suicide risk were tested. Additionally, risk profiles of those who experienced polyvictimization (2 + types of victimization; n = 1,932) were compared across sexual minority status. Results confirm that SMA are more likely to experience polyvictimization than heterosexual adolescents (31.8% v. 12.9%, respectively); however, also indicate that polyvictimization does not fully explain elevated suicide risk among SMA.     

Fractional approaches for the distribution of innovation sequence of INAR(1) processes

Abstract

In this paper, we present a fractional decomposition of the probability generating function of the innovation process of the first-order non-negative integer-valued autoregressive [INAR(1)] process to obtain the corresponding probability mass function. We also provide a comprehensive review of integer-valued time series models, based on the concept of thinning operators with geometric-type marginals. In particular, we develop two fractional approaches to obtain the distribution of innovation processes of the INAR(1) model and show that the distribution of the innovations sequence has geometric-type distribution. These approaches are discussed in detail and illustrated through a few examples.     

Earthquake Impacts on Immigrant Participation in the Greater Christchurch Construction Labor Market

Population Research and Policy Review - Post natural disaster immigration has potential to significantly impact labor markets, possibly affecting local workers’ employment opportunities and...     

Who now debates functionalism? fromsystem,change and conflict to “culture,choice, and praxis”

This paper makes a strategic return to an earlier sociological era as a way of charting where we have been and where we are heading. Specifically, it returns to the debate over functionalism as represented in a volume edited by the author and Richard Peterson in 1967 entitledSystem, Change and Conflict. The paper argues that little of that controversy remains, but that several key issues have taken on new forms and serve as the foci of new disputes. A comparable volume today would require a quite different title, perhaps “Culture, Choice, and Praxis.” The paper briefly reviews the three new movements referred to and the issues surrounding them. It concludes with remarks on the changing role of theory itself within sociology.     

The effects of maternal depression on children

The importance of identifying children at risk because of parental pathology such as schizophrenia has been well established. It is recommended that a systematic investigation of children of depressed mothers be made. An object relations developmental model is presented as a conceptual framework for understanding the consequences to children of being cared for by depressed mothers.     

Treating resistant children

Engating children in the therapeutic process is often a difficult task. Factors underlying this resistance are discussed, along with practical considerations and strategies. Ways of gaining the attention and involvement of children through the uses of innovative play techniques are also reviewed.He is also in private practive and a consultant for a community mental health agency.     

THE DEVELOPMENT OF A FORGIVENESS SCALE

This paper reports on the development, validity, and reliability of a self-report instrument designed to assess a respondent's perspective of pain resulting from relational violations and work toward relational forgiveness based on framework proposed by Hargrave (1994a). Presented here is the five-stage procedure used in the development of the Interpersonal Relationship Resolution Scale. Construct validity and reliability were determined from an initial sample of 164 subjects. Concurrent validity of the scal was supported by another sample of 35 respondents who took the Interpersonal Relationship Resolution Scal, the Personal Authority in the Family System Questonnaire, the Relational Ethics Scale, the Fundamental Interpersonal Relations Orientation-Behavior scale, and the Burns Depression Checklist. Finally, a predictive validity study of the scale was performed with a clinical and nonclinical sample of 98 volunteers. Data are presented that support the validity and reliability of the instrument, as will as the final version of the scale.     

Sociology as a discipline: Quasi-science and quasi-humanities

Sociologists, like other professionals and academic practitioners, have engaged in a collective project—“becoming a science.” This article traces the occupational and intellectual components of that project, focusing especially on the model of science employed, the limits of that model, and the limits of the science model in general. It is argued that sociology is a quasi-science and a quasi-humanities. Unfortunately, sociology has not systematically pursued its links to the humanities. The article argues for maintaining the empirical and explanatory thrust of the science model, while recognizing the extent to which concepts and theories are civilizationally embedded. The article ends with suggestions for systematically enriching sociology by closer links to the humanities. This article is a revision of a paper presented at the Plenary Session, The Future of Sociology, Annual Meeting of the American Sociological Association, August 24, 1988, Atlanta, Georgia. I have discussed the issues raised in this paper with, and received comments on previous drafts from, many colleagues: Andrew Abbott, Renee Anspach, Joseph Berger, Philip Converse, Claude Fischer, Herbert Gans, Michael Kennedy, Albert J. Rothenberg, AndrewScott, Anne Scott, Robert Scott, William Sewell, Jr., Margaret Somers, Sheldon Stryker, and Charles Tilly. They are not responsible for its sins.