Penetrating injuries of the thorax and abdomen, such as gunshot stabbing, are rare in children. We present case a pediatric patient with history remote injury presenting late aneurysm left ventricle. ( Level Difficulty: Intermediate. )

We study the problem of separating n points in the plane, no two of whi h have the same xor yoordinate, using a minimum number of verti al and horizontal lines avoiding the points, so that ea h ell of the subdivision ontains at most one point. Extending previous NP-hardness results due to Freimer et al. we prove that this problem and some variants of it are APX-hard. We give a 2-approximation a...

Collagen crosslink plays a major role in regulating the mechanical performance of load-supporting tissues. The human intervertebral discs have higher concentration of mature crosslinks than any other tissues which signals demanding mechanical requirements. In vitro, genipin, an exogenous crosslink, can increase spinal motion segment stability, improve mechanical properties of annulus fibrosus, ...

Given a set B of convex polyhedra in R 3 , a linè in R 3 is called a stabbing line for B if it intersects all polyhedra of B. This paper presents an upper bound of O(n 3 logn) on the complexity of the space of stabbing lines for B. We solve a more general problem which counts the number of faces in a set of convex polyhedra, which are implicitly deened by a set of half-spaces and an arrangement...