An investigation of neighborhood-level social, economic and physical factors for railway suicide in Victoria, Australia

BACKGROUND: This study investigates the associations between railway suicide and neighborhood social, economic, and physical determinants using postcode-level data. It also examines whether the associations are influenced by having high concentration of high-risk individuals in a neighborhood area. METHODS: Railway suicide cases from Victoria, Australia for the period of 2001-2012, their age, sex, year of death, usual residential address and suicide location were obtained from the National Coronial Information System. Univariate negative binomial regression models were used to estimate the association between railway suicide and neighborhood-level social, economic and physical factors. Variables which were significant in these univariate models were then assessed in a multivariate model, controlling for age and sex of the deceased and other known confounders. RESULTS: Findings from the multivariate analysis indicate that an elevated rate of railway suicide was strongly associated with neighborhood exposure of higher number of railway stations (IRR=1.30 95% CI=1.16-1.46). Other significant neighborhood risk factors included patronage volume (IRR=1.06, 95% CI=1.02-1.11) and train frequency (IRR=1.02, 95% CI=1.01-1.04). An increased number of video surveillance systems at railway stations and carparks was significantly associated with a modest reduction in railway suicide risk (IRR=0.93, 95% CI=0.88-0.98). These associations were independent of concentration of high-risk individuals. LIMITATIONS: Railway suicide may be under-reported in Australia. CONCLUSIONS: Interventions to prevent railway suicide should target vulnerable individuals residing in areas characterized by high station density, patronage volume and train frequency.

Maximizing real-time streaming services based on a multi-servers networking framework

In recent years, we have witnessed substantial exploitation of real-time streaming applications, such as video surveillance system on road crosses of a city. So far, real world applications mainly rely on the traditional well-known client-server and peer-to-peer schemes as the fundamental mechanism for communication. However, due to the limited resources on each terminal device in the applications, these two schemes cannot well leverage the processing capability between the source and destination of the video traffic, which leads to limited streaming services. For this reason, many QoS sensitive application cannot be supported in the real world. In this paper, we are motivated to address this problem by proposing a novel multi-server based framework. In this framework, multiple servers collaborate with each other to form a virtual server (also called cloud-server), and provide high-quality services such as real-time streams delivery and storage. Based on this framework, we further introduce a (1-?) approximation algorithm to solve the NP-complete "maximum services"(MS) problem with the intention of handling large number of streaming flows originated by networks and maximizing the total number of services. Moreover, in order to backup the streaming data for later retrieval, based on the framework, an algorithm is proposed to implement backups and maximize streaming flows simultaneously. We conduct a series of experiments based on simulations to evaluate the performance of the newly proposed framework. We also compare our scheme to several traditional solutions. The results suggest that our proposed scheme significantly outperforms the traditional solutions.

Migrant youth and social policy in multicultural Australia: exploring cross-cultural networking

This chapter explores the extent to which the direction of Australia’s official multicultural and civic integration policies, reflects the social attitudes and networking practices of migrant youth. The chapter pays particular attention to the Federal Government’s “Anti-Racism Strategy” announced in 2012 as part of its Multicultural Policy. On a theoretical level, direct efforts to mitigate racism have the potential to augment strategies that reaffirm pluralism and address disadvantage often associated with the migrant experience. On an empirical level, it is important to explore the extent to which such top-level discourses have actual founding in the social lives of migrant youth. Therefore this chapter presents the empirical findings of an empirical longitudinal on “Social Networks, Belonging and Active Citizenship among Migrant Youth” (Australian Research Council Linkage project 2009–2013). Migrant youth in this study pointed to a number of instances of racism, which act as significant barriers to cross-cultural networking. Analysis of the data shows, among other things, that there is a persistent tendency among migrant youth to point to their social distance from the metaphorical “Aussie Aussie” people of Anglo origins who are perceived as symbolising Australia’s mainstream. Such manifestations of racial discrimination preclude the emergence of a genuinely inclusive society that supports and nurtures cultural diversity as a significant part of the Australian national identity, as well as the stated objectives of its social policy repertoire.

Software-defined wireless networking opportunities and challenges for internet-of-things: a review

With the emergence of Internet-of-Things (IoT), there is now growing interest to simplify wireless network controls. This is a very challenging task, comprising information acquisition, information analysis, decision-making, and action implementation on large scale IoT networks. Resulting in research to explore the integration of software-defined networking (SDN) and IoT for a simpler, easier, and strain less network control. SDN is a promising novel paradigm shift which has the capability to enable a simplified and robust programmable wireless network serving an array of physical objects and applications. This paper starts with the emergence of SDN and then highlights recent significant developments in the wireless and optical domains with the aim of integrating SDN and IoT. Challenges in SDN and IoT integration are also discussed from both security and scalability perspectives.

LTE networking : extending the reach for sensors in mHealth applications

Sensor and electronic-health networks are widely utilized at home and in industry/research applications. In a local sense, a sensor-to-sensor network can have a range of a few meters to a couple of hundred meters (ZigBee Pro can extend this range up to 2000 m). With the deployment of mobile technology in the healthcare space (mobile-Health ‘m-Health’) and using cellular coverage, the range can virtually be unbounded. However, supporting bounded delay (end-to-end delay), class of service, and quality of service for critical sensor-mHealth applications may become challenging. This challenge can be alarmingly extended when thousands of users run their sensor-mHealth applications simultaneously and depend on limited coverage of the cell tower to transmit their health-related data across. In this paper we will discuss how the 3rd Generation Partnership Project–Long Term Evolution networks can address such aggregation issues, and discuss the challenges and provide recommendations.

Perceived neighborhood environmental attributes sssociated with walking and cycling for transport among adult residents of 17 cities in 12 countries: the IPEN study

INTRODUCTION: Prevalence of walking and cycling for transport is low and varies greatly across countries. Few studies have examined neighborhood perceptions related to walking and cycling for transport in different countries. Therefore, it is challenging to prioritize appropriate built-environment interventions. OBJECTIVES: The aim of this study was to examine the strength and shape of the relationship between adults' neighborhood perceptions and walking and cycling for transport across diverse environments. METHODS: As part of the International Physical activity and Environment Network (IPEN) adult project, self-reported data were taken from 13,745 adults (18-65 years) living in physically and socially diverse neighborhoods in 17 cities across 12 countries. Neighborhood perceptions were measured using the Neighborhood Environment Walkability Scale, and walking and cycling for transport were measured using the International Physical Activity Questionnaire-Long Form. Generalized additive mixed models were used to model walking or cycling for transport during the last seven days with neighborhood perceptions. Interactions by city were explored. RESULTS: Walking-for-transport outcomes were significantly associated with perceived residential density, land use mix-access, street connectivity, aesthetics, and safety. Any cycling for transport was significantly related to perceived land use mix-access, street connectivity, infrastructure, aesthetics, safety, and perceived distance to destinations. Between-city differences existed for some attributes in relation to walking or cycling for transport. CONCLUSIONS: Many perceived environmental attributes supported both cycling and walking; however, highly walkable environments may not support cycling for transport. People appear to walk for transport despite safety concerns. These findings can guide the implementation of global health strategies.

Design and evaluation of coordinated in-network caching model for content centric networking

In-network caching has been widely adopted in Content Centric Networking (CCN) to accelerate data delivery, mitigate server load and reduce network traffic. However, the line-speed requirement makes the in-network caching space very limited. With the rapid growth of network traffic, it is significant challenging to decide content placement in such limited cache space. To conquer this conflict, coordinated in-network caching schemes are needed so as to maximize the profit of ubiquitous caching capacities. In particular, in-network caching in CCN is deployed as an arbitrary network topology and naturally supports dynamic request routing. Therefore, content placement scheme and dynamic request routing are tightly coupled and should be addressed together. In this paper, we propose a coordinated in-network caching model to decide the optimal content placement and the shortest request routing path under constraints of cache space and link bandwidth in a systematic fashion. Via extensive simulations, the effectiveness and efficiency of our proposed model has been validated.

Emotional and cognitive interpersonal processes associated with online social networking

This thesis explored the use of social networking sites (SNSs) from social and cognitive psychological perspectives. It focused on the interpersonal processes associated with interacting with emotionally negative SNS posts, and found that impression management, trait empathy, mood, and cognitive function all impact the ways in which people interact online.

Influence of work pressure on proactive skill development in China: the role of career networking behavior and guanxi HRM

This research examines how work pressure influences proactive skill development in the contextof the Chinese workplace. Drawing from the conservation of resources theory, we developa model which argues that career networking behavior serves as the mechanism that allowsemployees to transform work pressure into proactive skill development. We further arguethat in the context of the Chinese workplace, guanxi HRM, which is a culturally-specific workplacepractice deeply-rooted in Chinese tradition, plays a contingency role in influencing theextent to which work pressure influences career networking behavior. We test our modelusing Partial Least Squares Structural Equation Modeling for a sample of employees (N =392) in China. The results show that career networking behavior positively mediates the influenceof work pressure on proactive skill development and that guanxi HRM positively and significantlymoderates the influence of work pressure on career networking behavior. The overallfindings provide empirical support for the relevance of contextual and motivational factors inexplaining employee proactive skill development. The theoretical and practical implicationsof the findings are fully discussed.