Climate countdown

The Lancet Countdown: tracking progress on health and climate change.

The Lancet Countdown: tracking progress on health and climate change is an international, multidisciplinary research collaboration between academic institutions and practitioners across the world. It follows on from the work of the 2015 Lancet Commission, which concluded that the response to climate change could be "the greatest global health opportunity of the 21st century". The Lancet Countdo...

Constrained Priority Countdown Freezing - A Collision Memory Avoidance Algorithm

Collision memory in IEEE 802.11 Distributed Coordination Function (DCF) has been detected. The collision memory can increase the physical collision rate and this effect is inherent to any DCF type of countdown. In this paper, we introduce a collision memory avoidance algorithm, called Constrained Priority Countdown Freezing (CPCF). The CPCF can completely or partially remove collision memory de...

Time Management Situation Assessment (tmsa)*

TMSA is a concept prototype developed to support NASA Test Directors (NTDs) in schedule execution monitoring during the later stages of a Shuttle countdown. The program detects qualitative and quantitative constraint violations in near real-time. The next version will support incremental rescheduling, and reason over a substantially larger number of scheduled events. INTRODUCTION The Time Manag...

Effect of Phase Countdown Timers on Queue Discharge Characteristics Under Heterogeneous Traffic Conditions

An Analysis of The Effects of Installing Pedestrian Countdown Timers on the Incidence of Pedestrian Crashes in the City of Detroit Michigan

In large cities, pedestrians account for 40% to 50% of traffic fatalities. Previous studies based on relatively small samples have concluded that Pedestrian Countdown Timers can reduce pedestrian crashes at signalized intersections. The purpose of the present study was to examine the effect of Pedestrian Countdown Timer (PCT) on crashes in a large city with a long baseline and relatively patter...

(The Final) Countdown

The Countdown game is one of the oldest TV show running in the world. It started broadcasting in 1972 on the french television and in 1982 on British channel 4, and it has been running since in both countries. The game, while extremely popular, never received any serious scientific attention, probably because it seems too simple at first sight. We present in this article an in-depth analysis of...