The single-index support vector regression model to address the problem of high dimensionality

ABSTRACT

The last few years, the applications of Support Vector Machine (SVM) for solving classification and regression problems have been increasing, due to its high performance and ability to transform the non-linear relationships among variables to linear form by employing the kernel idea (kernel function). In this work, we develop a semi-parametric approach to fit single-index models to deal with high-dimensional problems. To achieve this goal, we use support vector regression (SVR) for estimating the unknown nonparametric link function, while the single-index is determined by using the semi-parametric least squares method (Ichimura 1993). This development enhances the ability of SVR to solve high-dimensional problem. We design a three simulation examples with high-dimensional problems (linear and nonlinear). The simulations demonstrate the superior performance of the proposed method versus the standard SVR method. This is further illustrated by applying the real data.     

WEAPONS OF SEX,WEAPONS OF WAR

Recent international attention has focused on designations of rape and sexual violence in conflict zones. The most formative debates on this issue centre on the 1990s-era conflicts in the former Yugoslavia and Rwanda, which also involved heated debates amongst feminists over designations of rape as genocide. While the International Criminal Tribunal for Rwanda case, the Prosecutor v. Akayesu, resulted in the first formal charge of wartime rape as genocide within international criminal law, the first case to charge wartime rape as genocidal occurred in US federal court. This project looks for the overarching social and political meaning of the contemporary international legal focus on rape and sexual violence. It examines why, how, and to what extent US and transnational feminist legal academics and activists transmitted and secured their understandings of the relationships between sex, violence and ethno-religious difference within the international legal arena. In doing so, I argue that their participation in the contemporary recognition and narration of sexual injury in a global context both retreads and reconfigures the heated 1980s-era US Sex Wars debates on the workings of gender, sex, race and power.     

Information systems project failure – analysis of causal links using interpretive structural modelling

The analysis of the root causes of information systems project failure has been the subject of intense scrutiny for some time within industry and the academic community. Researchers have developed various models, notions of failure and categorisations to succinctly classify project failure into a set of key factors for organisations and project managers to focus on in their attempts to avoid failure. This study incorporates a technique titled: interpretive structural modelling as the methodology to formalise the relationships between the selected failure factors. This approach is positioned as a mechanism that can yield greater insights into the relationships between the factors surrounding project failure, thereby developing a better understanding of how these relationships can have a bearing on project outcomes. The findings identify key driving variables that are presented as having significant impact on the other factors within the model. A number of variables are also identified as being heavily dependent on other connected factors highlighting that a failure in one or more of these connected factors is likely to result in a failure in one or more of the dependent factors unless timely steps are taken to address these key issues. This research details a number of practical implications for senior management and project managers as well as the academic community. These considerations form an underlying thread within this study as specific practice-related implications are highlighted and discussed throughout the study.     

Decay patterns of invasive plants and plastic trash in urban streams

Urban streams are impacted by invasion of exotic riparian plants and the accumulation of plastic trash, which alter in-stream litter subsidies, and cause changes that cascade up the aquatic food web. The impacts of these factors on urban streams is poorly understood. We compared decay rates and invertebrate colonizers of 5 litter pack types in 4 urban streams in Victoria, British Columbia, Canada: Native Red alder (Alnus rubra) and Sitka willow (Salix sitchensis), invasive English ivy (Hedera sp.), Himalayan blackberry (Rubus armeniacus) and plastic trash (i.e. Styrofoam (polystyrene (PS)), plastic bag (high-density polyethylene (HDPE)), and Mylar (polyethylene terephthalate (PET). We tested 4 hypotheses: 1) exotic ivy and blackberry leaves would decay more slowly than native leaves; 2) exotic ivy and blackberry leaves would attract fewer and less diverse stream invertebrates than native leaves; 3) plastic trash would decay more slowly than leaves; and, 4) plastic trash would attract fewer and less diverse stream invertebrates than leaves. We found no difference between the leaf litter decay rates, however plastic trash decayed more slowly than leaves. Trash decay rates were faster than reported in marine environments, suggesting that plastic trash removal should be a management priority. Stream invertebrates colonized all pack types equally. We observed significant differences in litter decay rates and invertebrate assemblage alpha and Shannon–Wiener diversities across the 4 streams - likely related to differences in stream-specific environmental attributes including flashiness, stream discharge, and biological decay. We conclude that site-specific decay forces supersede litter quality in Pacific Coast urban streams.     

The role of emotions during the Arab Spring in Tunisia and Egypt in light of repertoires

ABSTRACT

This article examines the role of emotions during the Arab Spring in Tunisia and Egypt in the context of collective level emotions in mobilizations. Emotions are understood as a catalyst whose mechanism of action is performed through repertories. This article seeks to answer how emotions, having a triggering role, are performed through repertoires while accelerating mobilization against authoritarian orders, creating the intersection of individual and collective level emotions in public spheres of Tunisia and Egypt, and thus affecting the transnational diffusion of emotions. The significant reason to address emotions is to explain what stimulated the Arab Spring and how it spread over the region starting from Tunisia and Egypt. This article synthesizes two literatures: International Relations (IR) and social movements studies in light of emotions and components of repertoires which are as follows: collective action, collective identity, symbolic politics, network society and information politics.     

Does Demographic Transition with Human Capital Dynamics Matter for Economic Growth? A Dynamic Panel Data Approach to GMM

Social Indicators Research - This study seeks to empirically investigate whether demographic transition with dynamics of human capital matters for economic growth for a representative sample of...     

Understanding Condom Use Decision Making Among Homeless Youth Using Event-Level Data

This is one of the first qualitative event-based studies to understand the various mechanisms through which multiple factors influence condom use decision making among homeless youth. Event-level interviews that explore characteristics of the environment surrounding sexual events were conducted with 29 youth who were asked to describe two recent sexual encounters. In thematic analyses of data across events, reasons that youth gave for engaging in unprotected sex included the expectation of having sex and use of alternative methods of protection against pregnancy. Other nonevent factors that influenced condom use decision making were related to attributes of the partnership (e.g., testing, trust and love, and assessments of risk) and attributes of the youth (e.g., perceptions of diseases, concerns over pregnancy, and discomfort using condoms). Additional event analyses conducted within the same individuals found that decision making was influenced by multiple interacting factors, with different pathways operating for event and nonevent factors. Future interventions should consider taking a multilevel and individualized approach that focuses on event-based determinants of risky sex in this population.