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We present our experiences to date building ONOS (Open Network Operating System), an experimental distributed SDN control platform motivated by the performance, scalability, and availability requirements of large operator networks. We describe and evaluate two ONOS prototypes. The first version implemented core features: a distributed, but logically(More)
Virtualized environments have been around for a long time, but until recently these have focused solely on compute virtu-alization and left the network behind. Network virtualization enables multiple tenants to share the same physical infrastructure by decoupling the physical network from the virtual network. In this paper, we introduce OpenVirteX, a(More)
  • W F Snow
  • 1980
There was a relationship between wind speed and catches of Anopheles melas and Culex thalassius which attempted to bite man at ground level and at 4 and 8 m on an open scaffolding tower, in cleared bush in The Gambia. It was expected that in winds which exceeded their flight speed, no mosquitoes would be able to approach and attack men on the tower. Catches(More)
  • W F Snow
  • 1983
The succession of mosquito species and their abundance was observed through one cycle of dry-season irrigated rice cultivation near Bansang in The Gambia. The study covered a 21-week period, February-June 1975. Mosquitoes were sampled using a single suction trap located in a dry field beside the rice fields. Few mosquitoes were present before irrigation(More)
  • W F Snow
  • 1987
The house-entering behaviour of nocturnal mosquitoes was studied in The Gambia. Mosquitoes were captured as they attacked man in the open and in experimental huts which comprised 1.8 m cube frames with corrugated iron roofs and plywood walls of various heights. Catches of all species were similar in the open and in a roofed, but unwalled, hut frame. The(More)
Empirical testing of candidate vaccines has led to the successful development of a number of lifesaving vaccines. The advent of new tools to manipulate antigens and new methods and vectors for vaccine delivery has led to a veritable explosion of potential vaccine designs. As a result, selection of candidate vaccines suitable for large-scale efficacy testing(More)
Trypanosomes from 36 midgut infections were isolated in procyclic culture from Glossina morsitans submorsitans and G. palpalis gambiensis in The Gambia. Twenty-eight stocks (78%) were identified using DNA probes specific for: (a) Trypanosoma (Nannomonas) congolense savannah type, (b) T. (N.) congolense riverine-forest type, (c) T. (N.) simiae and (d)(More)