This dissertation is concerned with the problem of determining the track or trajectory of a mobile device — for example, a sequence of road segments on an outdoor map, or a sequence of rooms visited inside a building — in an energy-efficient and accurate manner. GPS, the dominant positioning technology today, has two major limitations. First, it consumes significant power on mobile phones, maki...

The Internet is far from achieving the “five 9s” (99.999%) of availability provided by the public telephone network. Based on anecdotal evidence as well as a first-of-its-kind measurement study assessing routing failures affecting Amazon’s EC2 data centers, we find that network outages are surprisingly common and highly problematic. These outages incur large costs, disrupt critical services and...

Most of the customer outages are the results of some problems related to distribution systems. Prolonged outages may cause cold load pickup problems because of the increased penetration of thermostaticallycontrolled devices and the loss of diversity among these devices. Since loads higher than normal may be expected after prolonged outages, restoration problems may occur when there is not enoug...

Abstract. Strong winds induced by extratropical storms cause a large number of power outages, especially in highly forested countries such as Finland. Thus, predicting the impact is one key challenges for grid operators. This article introduces novel method to predict storm severity employing ERA5 reanalysis data combined with forest inventory. We start identifying objects from wind gust and pr...

Fragility curves depict the relationship between a weather variable (wind speed, gust speed, ice accumulation, precipitation rate) and the observed outages for a targeted infrastructure network. This paper describes an empirical study of the county by county distribution of power outages and one minute weather variables during Hurricane Irene with the objective of comparing 1) ‘as built’ fragil...