With the explosive growth of mobile data demand, the fifth generation (5G) mobile network would exploit the enormous amount of spectrum in the millimeter wave (mmWave) bands to greatly increase communication capacity. There are fundamental differences between mmWave communications and existing other communication systems, in terms of high propagation loss, directivity, and sensitivity to blockage. These characteristics of mmWave communications pose several challenges to fully exploit the potential of mmWave communications, including integrated circuits and system design, interference management, spatial reuse, anti-blockage, and dynamics control. To address these challenges, we carry out a survey of existing solutions and standards, and propose design guidelines in architectures and protocols for mmWave communications. We also discuss the potential applications of mmWave communications in the 5G network, including the small cell access, the cellular access, and the wireless backhaul. Finally, we discuss relevant open research issues including the new physical layer technology, software-defined network architecture, measurements of network state information, efficient control mechanisms, and heterogeneous networking, which should be further investigated to facilitate the deployment of mmWave communication systems in the future 5G networks.

A survey of millimeter wave communications (mmWave) for 5G: opportunities and challenges

Antibiotic resistance and extended spectrum beta-lactamases: Types, epidemiology and treatment.

A literature review on the vehicle routing problem with multiple depots

Hydrological modelling of urbanized catchments: A review and future directions

BACKGROUND: Poor quality of care including fear of disrespect and abuse (DA OR: [0.6 95% CI (0.36 0.90); p=0.017]. Clients with no companion during delivery were less likely to experience inappropriate demands for payment; OR: [0.49 (0.26 0.95); p=0.037]; while women with higher parities were three times more likely to be detained for lack of payment and five times more likely to be bribed compared to those experiencing there first birth. CONCLUSION: One out of five women experienced feeling humiliated during labor and delivery. Six categories of D&A during childbirth in Kenya were reported. Understanding the prevalence of D&A is critical in developing interventions at national health facility and community levels to address the factors and drivers that influence D&A in facilities and to encourage clients future facility utilization.

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Exploring the prevalence of disrespect and abuse during childbirth in Kenya.

New York City, one of the most populous and ethnically diverse cities in the world, has responded to a variety of enviornmental challenges in its history. The most recent is climate change, which is projected to have wide impacts on the city's critical infrastructure and population through higher temperatures, more intense flooding events and sea level rise. The city recognized the risks early and has become a national and international leader in responding to this new challenge, illustrating how this is possible for a large city. As part of a mature urban region, it is an excellent bellwether for the impacts that may be experienced by other cities, especially those in emerging metropolitan conurbations.

Stephen Solecki

Papers

New York, USA