Maintaining link connectivity between a mobile robot and its control station in a non-line-of-sight environment is challenging. One solution is to use intermediate relay radios that the robot can carry and deploy when and where needed to maintain the link. However, the precise placement locations for the relays are not known ahead of time. Therefore, the deployment decision must be formulated o...

We consider the downlink of an inter-operator spectrum sharing scenario where two operators share the same piece of spectrum and use it simultaneously. A base station of one operator cooperates with a base station of the other operator in order perform joint user selection and beamforming using a central unit. Optimal scheduling, in the sense of maximizing sum-rate or proportional fairness, is ...

In this paper, power allocation is distributed within each Base Station. Two cases are considered: CSIT, and iterative water filling. In both cases, a distributed convergence criterion for power control is determined and included within iterative power allocation. In the past margin Adaptive (MA) problem in MIMO OFDMA multi-cell networks. The CSIT is avoiding the margin adaptive and are consequ...

The increased travelling of today makes nodes along travelling routes more and more important. This is very much the case of petrol stations. They constitute important nodes in the road network, filling up thirsty fuel tanks and hungry stomachs, guiding road users and providing vehicle-services. In this thesis the role of the petrol station for road users was investigated in order to find out i...

In April 1976 the most disastrous peace-time accident in Finland took place in the town of Lapua, where a cartridge-filling station in an ammunition factory exploded and 40 people were killed. I was in charge of the local health centre activities, and describe what happened.

Exposure to the aromatic hydrocarbon is a public health problem and threat to environment with proven harmful impact on humanity, including industrial workers and general population. Petrol station attendants are workers chronically exposed at least five year to petroleum derivatives primarily through inhalation of the volatile fraction of petrol during vehicle refueling. Significant include ha...

Battery swapping is a promising technology when compared with the traditional electric vehicle charging stations. The time spent at battery station might be similar to filling station. article presents information on attempts implement this solution, methods of swapping, infrastructure and operation stations, as well benefits key challenges technology.