Node 4

Node 4, also known as the Docking Hub System (DHS), is a proposed module of the International Space Station (ISS). As of 2011 NASA was considering a 40-month design and development effort for Node 4 that would result in its launch in late 2013.

Node 4 would be built using the Node Structural Test Article (STA) and docked to the forward port of the Harmony module. The Structural Test Article was built to facilitate testing of ISS hardware and was intended to become Node 1. However, during construction, structural design flaws were discovered. The under-construction Node 2 was renamed Node 1 and the STA (ex-Node 1) was put into storage at the Kennedy Space Center (KSC).

Since Space Shuttle program has been terminated, should a decision to build and launch Node 4 be taken, it could be launched by an Atlas V or Delta IV rocket.

In December 2011 Boeing proposed using Node 4 as the core of an Exploration Gateway Platform to be constructed at the ISS and relocated via space tug to an Earth-Moon Lagrange point (EML-1 or 2). The purpose of the platform would be to support lunar landing missions with a reusable lunar lander after the first two SLS flights. It would also satisfy the need for a L1 propellant depot for lunar missions. Other hardware would include an airlock, an 'international module', and a MPLM based habitat module.

Node

In general, a node is a localised swelling (a "knot") or a point of intersection (a vertex).

Node may refer to:

In mathematics

In computing and electronics

Freddie Wong

Freddie Wong (born September 13, 1985) is an American filmmaker, musician, VFX artist and competitive gamer. He is a major part of the YouTube channel RocketJump. He is the older brother of actor and YouTuber Jimmy Wong.

Early life

Wong attended Lakeside School in Seattle, Washington. He then attended and graduated from the University of Southern California School of Cinematic Arts. Wong owns and manages Overcrank Media, a Los Angeles-based media production company specializing in feature film and online video content, having produced an independent film titled Bear. Wong met his future collaborator Brandon Laatsch in college.

Career

Wong competed in the World Series of Video Games in Dallas in July 2007. He won first prize in the Guitar Hero 2 competition, playing the song "Less Talk More Rokk" by Freezepop.

During MTV's "Gamer's Week" celebration in November 2007, Freddie appeared as a guest on Total Request Live. Participating in the program with his newly formed band Hellanor Brozevelt, Wong was part of a country-wide search to find the best Rock Band ensemble. After receiving tutelage from well-known rockers Good Charlotte, Brozevelt performed at the Hard Rock Cafe in New York against Chicago-based Carrie Me Home.

Vertex (graph theory)

In mathematics, and more specifically in graph theory, a vertex (plural vertices) or node is the fundamental unit of which graphs are formed: an undirected graph consists of a set of vertices and a set of edges (unordered pairs of vertices), while a directed graph consists of a set of vertices and a set of arcs (ordered pairs of vertices). In a diagram of a graph, a vertex is usually represented by a circle with a label, and an edge is represented by a line or arrow extending from one vertex to another.

From the point of view of graph theory, vertices are treated as featureless and indivisible objects, although they may have additional structure depending on the application from which the graph arises; for instance, a semantic network is a graph in which the vertices represent concepts or classes of objects.

The two vertices forming an edge are said to be the endpoints of this edge, and the edge is said to be incident to the vertices. A vertex w is said to be adjacent to another vertex v if the graph contains an edge (v,w). The neighborhood of a vertex v is an induced subgraph of the graph, formed by all vertices adjacent to v.