Abstract: Disclosed in the present application are: a pen-type structure for mixing and discharging a bio-ink or a hydrogel: and a bio-ink or hydrogel printing method using same. The pen-type structure comprises: a cylindrical first barrel for housing a first screw; a cylindrical second barrel for housing a second screw, which is longer than the first screw and has a structure parallel with the first screw; a controller connected to a gear of the first screw and a gear of the second screw so as to drive the first screw and the second screw; two or more supply units formed in the first barrier and supplying a bio-ink or hydrogel material into the first barrel; and a bio-ink or hydrogel discharge unit which extends from the end portion of the second barrel on the opposite side of the controller, and which discharges bio-ink or hydrogel.

Abstract: A method and system for automated discovery of logical network elements in a communications network speeds up and reduces the cost of discovering network elements and mapping network topology of network inter-connections. The method comprises the steps of building a cache of protection mechanisms in the communications network, building a network graph based on physical links of the communications network, traversing the network graph, comprising the step of, at each vertex of the network graph, determining whether there is a deterministic path that leads to a next vertex of the network graph, performing a depth first search on the network graph to determine connected components of the network graph, and creating the logical network elements based on the connected components of the network graph.

Abstract: A method and system for automated discovery of logical network elements in a communications network speeds up and reduces the cost of discovering network elements and mapping network topology of network inter-connections. The method comprises the steps of building a cache of protection mechanisms in the communications network, building a network graph based on physical links of the communications network, traversing the network graph, comprising the step of, at each vertex of the network graph, determining whether there is a deterministic path that leads to a next vertex of the network graph, performing a depth first search on the network graph to determine connected components of the network graph, and creating the logical network elements based on the connected components of the network graph.