The advances in location-acquisition and mobile computing techniques have generated massive spatial trajectory data, which represent the mobility of a diversity of moving objects, such as people, vehicles and animals. Many techniques have been propos
ed for processing, managing and mining trajectory data in the past decade, fostering a broad range of applications. In this article, we conduct a systematic survey on the major research into trajectory data mining, providing a panorama of the field as well as the scope of its research topics. Following a roadmap from the derivation of trajectory data, to trajectory data preprocessing, to trajectory data management, and to a variety of mining tasks (such as trajectory pattern mining, outlier detection, and trajectory classification), the survey explores the connections, correlations and differences among these existing techniques. This survey also introduces the methods that transform trajectories into other data formats, such as graphs, matrices, and tensors, to which more data mining and machine learning techniques can be applied. Finally, some public trajectory datasets are presented. This survey can help shape the field of trajectory data mining, providing a quick understanding of this field to the community.
In this research, we have studied the ability of using a trochoidal
curve as a programmable path to finish flat surfaces of
aluminum-6061 specimens using ball burnishing technique. The
experiments were carried out by using the ball burnishing tool
which was designed, manufactured, and fixed on 3-axis CNC
milling machine .
Choosing of sprinkler trajectory angle and estimation of its
changing is an important factor in sprinkling irrigation systems.
Farmers choose sprinklers with small trajectory angle when they
used treatment wastewater, or water is spraying below tree canopy.
while sprinklers with high trajectory angle used when spraying
above canopy.
We have a detailed analytical study of the Coulomb barrier, the concept of collision factor, the concept of the trajectory,
and the concept of grazing angle in a collision between heavy nuclei, and that for many of the symmetrical systems A1 equal
A2
and asymmetric systems A1 doesn't equal A2 .The results obtained and presented for the first time in this way, help to differentiate between the electric interaction and the nuclear reaction, and then determine the energy ejaculation that should be used in order to show the interaction to be studied. On the one hand, on the other hand this helps to choice the detector (or
detectors) that must be used in experimental work, and then where to put this detector (or these detectors).
