With its delicate, mud-walled historic sites and narrow labyrinth of streets, Timbuktu presents challenging terrain for soldiers trying to secure the city.
Dealing with open boundaries in the computer simulation of unsteady subsonic shear flows presents challenging problems.
Nevertheless, developing pervasive games presents challenging issues, since programmers have to cope with high turnover, cheating, heterogeneity of devices and platforms.
Due to its inherent complexity, presents challenging problems, such as: 1) point stabilization control, to carry the ball to a specific position and hold it there, and 2) trajectory tracking control, in which the goal is to make the ball follows a predefined geometric trajectory (square and circle) minimizing the tracking error.
Due to its inherent complexity, presents challenging problems, such as: 1) point stabilization control, to carry the ball to a specific position and hold it there, and 2) trajectory tracking control, in which the goal is to make the ball follows a predefined trajectory (linear, square, circle and Lissajous curve) minimizing the tracking error and time.
Asymptomatic C. difficile colonization presents challenging concepts in the overall picture of this disease and its management.
