Raspberry Pi based lap counter for amateur car racing
This article presents the design of a lap counter and timer that can be used in amateur car racing. Main functions of this computer to count laps, measure lap time, vehicle speed and accelerations. The system uses a GPS module, accelerometer and magnetometer sensors.
Control the vehicle flow via GPS monitor center
The purpose of this paper is to develop land vehicle navigation and traffic flow monitoring and a control system which is composed of Global Positioning System receivers and RF beacon communication. The GPS receivers and the other sensors detect the position, velocity, density, and flow rate of the vehicles on a freeway. By collecting these data and transmitting them to a monitor control station, called the center of dispatch, the vehicle traffic can be controlled and traffic congestion can be avoided. Two algorithms are developed for the GPS vehicle traffic flow controller which can estimate the velocity, density and traffic flow of the vehicles in order to ascertain whether the traffic is stable, critical stable or unstable. A backpropagation algorithm feedforward neural network approach is provided which has achieved high efficiency. The probabilistic decision base neural network approach selected to classify the stability of the traffic system got the some results as the feedforward neural network approach. An experiment showed that this system can solve traffic problems.
Mathematical Time and Physical Time in the Theory Of Relativity
In the Theory of Relativity time is an imaginary quantity that can not be observed; it is a multiplication of a number that indicates duration of material change and number i that is an imaginary number. i on the square is -1. Time i⁄t is a mathematical time that describes the speed and the duration of material change. In the Universe one can observe physical time only as a stream of material change. It is not that change run in physical time, change itself is physical time.. Distinction between imaginary mathematical time and visible physical time opens some new perspectives into interpretation of Theory of Relativity. c