DISCUS: the distributed core for ubiquitous broadband access

A new end to end architecture based on Long-Reach Passive Optical Network (LR-PON) with wireless integration, a distributed core built of optical transparency islands and an OpenFlow-based control plane, which is being developed in the EU project DISCUS, is described in this paper. The main technological advances and the network modelling and optimization approach are reported

Resilient networking in wireless sensor networks

This report deals with security in wireless sensor networks (WSNs), especially in network layer. Multiple secure routing protocols have been proposed in the literature. However, they often use the cryptography to secure routing functionalities. The cryptography alone is not enough to defend against multiple attacks due to the node compromise. Therefore, we need more algorithmic solutions. In this report, we focus on the behavior of routing protocols to determine which properties make them more resilient to attacks. Our aim is to find some answers to the following questions. Are there any existing protocols, not designed initially for security, but which already contain some inherently resilient properties against attacks under which some portion of the network nodes is compromised? If yes, which specific behaviors are making these protocols more resilient? We propose in this report an overview of security strategies for WSNs in general, including existing attacks and defensive measures. In this report we focus at the network layer in particular, and an analysis of the behavior of four particular routing protocols is provided to determine their inherent resiliency to insider attacks. The protocols considered are: Dynamic Source Routing (DSR), Gradient-Based Routing (GBR), Greedy Forwarding (GF) and Random Walk Routing (RWR)

Tanzania Country Climate Risk Profile Series, Kilolo District

The agricultural sector in Tanzania has been exposed to high climatic risks for the past several decades (Arce & Caballero, 2015). Experts and farmers assert that climatic risks including unpredictable rainfall, prolonged drought, and increased incidences of pests and diseases have resulted in declining agricultural productivity. Concomitantly, the rivers, streams, soils, and forests from which the rural poor build their livelihoods are on the verge of depletion. The situation has been further exacerbated by unstable commodity prices. Future climatic projections show that the climate trends are likely to worsen in the coming years. For instance, mean annual temperatures in Tanzania are predicted to increase by up to 2.7°C by 2060, and by close to 50% by 2090 (Irish Aid, 2018). Similarly, day and night temperatures are also expected to increase. Rainfall will become increasingly erratic both locally and regionally, with both floods and droughts growing in intensity and frequency. Smallholder farmers have the poorest access to resources such as land tenure, water resources, crop and livestock insurance, financial capital, and markets, and thus are the least risk-resilient. Women farmers in particular suffer systematic discrimination in terms of access to these resources. Women are also culturally expected to execute the most laborious agricultural tasks in addition to their household responsibilities of caregiving, preparing meals, and collecting fuel and water. Meanwhile, men tend to be responsible for tasks involving financial exchange, such as land acquisition, sourcing capital for production, purchasing and applying chemicals, and identifying buyers. This cultural norm is reinforced by the tenure system, which assigns land ownership almost exclusively to men. These factors make women the most vulnerable sub-group of smallholder farmers (Irish Aid, 2018). The national government, donor community, private sector, and development partners have invested in helping households prepare for such climate scenarios. A number of policies, strategies, programmes, and guidelines have been documented with the goal of boosting the adaptation capacity of vulnerable groups. Prominent among these are the National Agricultural Policy (NAP 2013), the National Climate Change Strategy (NCCS 2012), the National Adaptation Programme of Action (NAPA 2007), and the Climate-Smart Agriculture implementation guideline. Despite these efforts, several issues remain unaddressed due to a lack of coordination among relevant actors. The development of a local Climate-Smart Agriculture Profile can support the clarification of roles and crucial points of coordination to assist in this effort. This Kilolo District profile thus underscores the climate-smart agriculture (CSA) investments undertaken by farming households in the region. This profile is an output of the CSA/SuPER project on Upscaling CSA with small scale food producers, organized via the Village Saving and Lending Association (VSLA) Project, and implemented by Cooperative Assistance and Relief Everywhere (CARE International), the International Center for Tropical Agriculture (CIAT) (now part of the Alliance of Bioversity International and CIAT), Sokoine University of Agriculture, and Wageningen University and Research. Both qualitative and quantitative methods were used to gather the information herein, in accordance with the methodology employed by Mwongera et al. (2015). Secondary information was collected through an extensive literature review. Primary information was collected from interviews with agricultural experts, farmer focus group discussions, stakeholder workshops, and farmer interviews in Kilolo District. This profile is organized into six major sections based on the analytical steps of the study. The first section describes the contextual importance of agriculture to Kilolo livelihoods and households. The second describes historic and future climatic trends. The third section highlights farmers’ priority value chains. The fourth section addresses the challenges and cross-cutting issues in the sector. The fifth section details climate hazards experienced by farmers, as well as the current and proposed adaptation strategies. Finally, the sixth section outlines the policies related to CSA and the institutions that facilitate implementation of climate change initiatives