Let M be a matroid on E ∪ {`}, where ` 6∈ E is a distinguished element of M . The `-port of M is the set P = {P : P ⊆ E with P ∪ {`} a circuit of M}. Let A be the P-E incidence matrix. Let U2,4 be the uniform matroid on four elements of rank two, F7 be the Fano matroid, F ∗ 7 be the dual of F7, and F 7 be the unique series extension of F7. In this paper, we prove that the system Ax ≥ 1, x ≥ 0 i...

The need to control information flow to a restricted set of accepted protocols arises from the vulnerabilities that may come from any protocol. Reducing the acceptable protocols to a small set of well-tested standard protocols will reduce the attack surface and provide high confidence in selected communications. These protocols are restricted to specific ports or addresses in the receiving web ...

During the past year, Bell Laboratories and Sandia National Laboratories have been modeling and simulating cross-industry interactions between infrastructures and the cascading of impacts under disruption scenarios. Critical national infrastructures for importing and exporting goods and materials (e.g., seaboard shipping through ports on the U.S. East and West Coasts) require the support of oth...

This is a description of the technique used for laparoscopy-assisted colostomy in neonates with anorectal malformations (ARM), using 2 laparoscopic ports only. The technique is easy to use and has the advantages of enabling identification of the sigmoideum, the internal genitals and to establish a stoma leaving only minimal scars in the umbilicus. In our departments, we routinely perform stoma ...

We propose a new index, the Container Port Connectivity Index (CPCI), to measure the trade connectivity of ports within the network of container shipping. This index is based on both economics and network topology, and a distinctive feature is that the strength of a port is based on its position within the global structure of the shipping network and not just on local information such as the nu...

BACKGROUND AND OBJECTIVE Robotic upper urinary tract surgery is in most of the cases performed utilizing a standard 5 port configuration. Fewer ports can potentially produce a less invasive operation. Taking in consideration the above we report a novel technique for robot assisted laparoscopic partial nephrectomy utilizing fewer ports and we test its feasibility and safety profile. METHODS Da...

In this paper we propose an extension of port Hamiltonian systems, called conservative systems with ports, which encompass systems arising from the Irreversible Thermodynamics. Firstly we lift a port Hamiltonian system from its state space manifold to the thermodynamic phase space to a contact vector field with inputs and outputs. Secondly, we define a more general class of contact vector field...