Energy Minimization Algorithm for Estimation of Clock Skew and Reception Window Selection in Wireless Networks.

The synchronization of time between devices is one of the more important and challenging problems in wireless networks. We discuss the problem of maximization of the probability of receiving a message from a device using a limited listening time window to minimize energy utilization. We propose a solution to two important problems in wireless networks of battery-powered devices: a method of establishing a connection with a device that has been disconnected from the system for a long time and developed unknown skew and also two approaches to follow-up clock synchronization using the confidence interval method.

Energy-Efficient Crowdsensing of Human Mobility and Signal Levels in Cellular Networks.

The paper presents a practical application of the crowdsensing idea to measure human mobility and signal coverage in cellular networks. Currently, virtually everyone is carrying a mobile phone, which may be used as a sensor to gather research data by measuring, e.g.

[Thrombosis within the area of muscle bridge as a cause of myocardial infarction].

Muscle bridge with concomitant sclerotic lesions may cause myocardial infarction (MI). We present a case of 70 year-old woman, who suffered from MI due to sclerotic lesion located within the anterior descending artery, right above the muscle bridge. Implanting two drug eluting stents resulted in restoration of proper flow through the vessel, widening the sclerotic lesion and the area of muscle bridge.

[Left ventricular thrombus--variability of causes and clinical presentation--four case reports].

Thrombi occurring in heart chambers, particularly in the left ventricle, are very often due to diseases leading to heart dilation. Thrombi could dissolve spontaneously or as a result of pharmacological treatment. They could also be mobilizes and produce emboli.