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Computer Network A computer network, or data network, is a digital telecommunications network which allows nodes to share resources. In computer networks, computing devices exchange data with each other using connections between nodes (data links.) These data links are established over cable media such as wires or optic cables, or wireless media such as WiFi. Network computer devices that originate, route and terminate the data are called network nodes.[1] Nodes can include hosts such as personal computers, phones, servers as well as networking hardware. Two such devices can be said to be networked together when one device is able to exchange information with the other device, whether or not they have a direct connection to each other [...More...]  "Computer Network" on: Wikipedia Yahoo 

Datacom (other) Datacom may refer to:Data communications or data transmission DATACOM/DB, a relational database for IBM mainframes Datacom Group, a New Zealandbased IT company Next Generation Data Communications (DataComm), an aviation initiative to replace some voice communications between pilots and air traffic control with textual messagesThis disambiguation page lists articles associated with the title Datacom. If an internal link led you here, you may wish to change the link to point directly to the [...More...]  "Datacom (other)" on: Wikipedia Yahoo 

Edge (graph Theory) This is a glossary of graph theory terms. Graph theory Graph theory is the study of graphs, systems of nodes or vertices connected in pairs by edges.Contents: !$@ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z See also ReferencesSymbols[edit]Square brackets [ ] G[S] is the induced subgraph of a graph G for vertex subset S. Prime symbol ' The prime symbol is often used to modify notation for graph invariants so that it applies to the line graph instead of the given graph. For instance, α(G) is the independence number of a graph; α′(G) is the matching number of the graph, which equals the independence number of its line graph [...More...]  "Edge (graph Theory)" on: Wikipedia Yahoo 

Interdependent Networks Interdependence is the mutual reliance between two or more groups. This concept differs from the reliance in a dependent relationship, where some members are dependent and some are not. There can be various degrees of interdependence. In an interdependent relationship, participants may be emotionally, economically, ecologically or morally reliant on and responsible to each other. An interdependent relationship can arise between two or more cooperative autonomous participants (e.g. a coop) [...More...]  "Interdependent Networks" on: Wikipedia Yahoo 

Dependency Network The dependency network approach provides a system level analysis of the activity and topology of directed networks. The approach extracts causal topological relations between the network's nodes (when the network structure is analyzed), and provides an important step towards inference of causal activity relations between the network nodes (when analyzing the network activity). This methodology has originally been introduced for the study of financial data,[1][2] it has been extended and applied to other systems, such as the immune system,[3] and semantic networks.[4] In the case of network activity, the analysis is based on partial correlations,[5][6][7][8][9] which are becoming ever more widely used to investigate complex systems. In simple words, the partial (or residual) correlation is a measure of the effect (or contribution) of a given node, say j, on the correlations between another pair of nodes, say i and k [...More...]  "Dependency Network" on: Wikipedia Yahoo 

Flow Network In graph theory, a flow network (also known as a transportation network) is a directed graph where each edge has a capacity and each edge receives a flow. The amount of flow on an edge cannot exceed the capacity of the edge. Often in operations research, a directed graph is called a network, the vertices are called nodes and the edges are called arcs. A flow must satisfy the restriction that the amount of flow into a node equals the amount of flow out of it, unless it is a source, which has only outgoing flow, or sink, which has only incoming flow [...More...]  "Flow Network" on: Wikipedia Yahoo 

Clique (graph Theory) In the mathematical area of graph theory, a clique (/ˈkliːk/ or /ˈklɪk/) is a subset of vertices of an undirected graph such that every two distinct vertices in the clique are adjacent; that is, its induced subgraph is complete. Cliques are one of the basic concepts of graph theory and are used in many other mathematical problems and constructions on graphs. Cliques have also been studied in computer science: the task of finding whether there is a clique of a given size in a graph (the clique problem) is NPcomplete, but despite this hardness result, many algorithms for finding cliques have been studied. Although the study of complete subgraphs goes back at least to the graphtheoretic reformulation of Ramsey theory by Erdős & Szekeres (1935),[1] the term clique comes from Luce & Perry (1949), who used complete subgraphs in social networks to model cliques of people; that is, groups of people all of whom know each other [...More...]  "Clique (graph Theory)" on: Wikipedia Yahoo 

Connected Component (graph Theory) In graph theory, a connected component (or just component) of an undirected graph is a subgraph in which any two vertices are connected to each other by paths, and which is connected to no additional vertices in the supergraph. For example, the graph shown in the illustration has three connected components. A vertex with no incident edges is itself a connected component. A graph that is itself connected has exactly one connected component, consisting of the whole graph.Contents1 An equivalence relation 2 The number of connected components 3 Algorithms 4 See also 5 References 6 External linksAn equivalence relation[edit] An alternative way to define connected components involves the equivalence classes of an equivalence relation that is defined on the vertices of the graph. In an undirected graph, a vertex v is reachable from a vertex u if there is a path from u to v [...More...]  "Connected Component (graph Theory)" on: Wikipedia Yahoo 

Cut (graph Theory) In graph theory, a cut is a partition of the vertices of a graph into two disjoint subsets. Any cut determines a cutset, the set of edges that have one endpoint in each subset of the partition. These edges are said to cross the cut. In a connected graph, each cutset determines a unique cut, and in some cases cuts are identified with their cutsets rather than with their vertex partitions. In a flow network, an s–t cut is a cut that requires the source and the sink to be in different subsets, and its cutset only consists of edges going from the source's side to the sink's side [...More...]  "Cut (graph Theory)" on: Wikipedia Yahoo 

Cycle (graph Theory) In graph theory, a cycle is a path of edges and vertices wherein a vertex is reachable from itself. There are several different types of cycles, principally a closed walk and a simple cycle; also, e.g., an element of the cycle space of the graph.Contents1 Definitions 2 Chordless cycles 3 Cycle space 4 Cycle detection 5 Covering graphs by cycles 6 Graph classes defined by cycles 7 See also 8 ReferencesDefinitions[edit] A closed walk consists of a sequence of vertices starting and ending at the same vertex, with each two consecutive vertices in the sequence adjacent to each other in the graph. In a directed graph, each edge must be traversed by the walk consistently with its direction: the edge must be oriented from the earlier of two consecutive vertices to the later of the two vertices in the sequence [...More...]  "Cycle (graph Theory)" on: Wikipedia Yahoo 

Graph (abstract Data Type) In computer science, a graph is an abstract data type that is meant to implement the undirected graph and directed graph concepts from mathematics, specifically the field of graph theory. A graph data structure consists of a finite (and possibly mutable) set of vertices or nodes or points, together with a set of unordered pairs of these vertices for an undirected graph or a set of ordered pairs for a directed graph. These pairs are known as edges, arcs, or lines for an undirected graph and as arrows, directed edges, directed arcs, or directed lines for a directed graph [...More...]  "Graph (abstract Data Type)" on: Wikipedia Yahoo 

Loop (graph Theory) In graph theory, a loop (also called a selfloop or a "buckle") is an edge that connects a vertex to itself. A simple graph contains no loops. Depending on the context, a graph or a multigraph may be defined so as to either allow or disallow the presence of loops (often in concert with allowing or disallowing multiple edges between the same vertices):Where graphs are defined so as to allow loops and multiple edges, a graph without loops or multiple edges is often distinguished from other graphs by calling it a "simple graph". Where graphs are defined so as to disallow loops and multiple edges, a graph that does have loops or multiple edges is often distinguished from the graphs that satisfy these constraints by calling it a "multigraph" or "pseudograph".In a graph with one vertex, all edges must be loops [...More...]  "Loop (graph Theory)" on: Wikipedia Yahoo 

Social Influence Social influence occurs when a person's emotions, opinions, or behaviors are affected by others.[1] Social influence takes many forms and can be seen in conformity, socialization, peer pressure, obedience, leadership, persuasion, sales, and marketing. In 1958, Harvard psychologist Herbert Kelman identified three broad varieties of social influence.[2]Compliance is when people appear to agree with others but actually keep their dissenting opinions private. Identification is when people are influenced by someone who is liked and respected, such as a famous celebrity. Internalization is when people accept a belief or behavior and agree both publicly and privately.Morton Deutsch and Harold Gerard described two psychological needs that lead humans to conform to the expectations of others [...More...]  "Social Influence" on: Wikipedia Yahoo 

Neighbourhood (graph Theory) In graph theory, an adjacent vertex of a vertex v in a graph is a vertex that is connected to v by an edge. The neighbourhood of a vertex v in a graph G is the subgraph of G induced by all vertices adjacent to v. For example, the image shows a graph of 6 vertices and 7 edges. Vertex 5 is adjacent to vertices 1, 2, and 4 but it is not adjacent to 3 and 6. The neighbourhood of vertex 5 is the graph with three vertices, 1, 2, and 4, and one edge connecting vertices 1 and 2. The neighbourhood is often denoted NG(v) or (when the graph is unambiguous) N(v). The same neighbourhood notation may also be used to refer to sets of adjacent vertices rather than the corresponding induced subgraphs. The neighbourhood described above does not include v itself, and is more specifically the open neighbourhood of v; it is also possible to define a neighbourhood in which v itself is included, called the closed neighbourhood and denoted by NG[v] [...More...]  "Neighbourhood (graph Theory)" on: Wikipedia Yahoo 

Path (graph Theory) In graph theory, a path in a graph is a finite or infinite sequence of edges which connect a sequence of vertices which, by most definitions, are all distinct from one another. In a directed graph, a directed path (sometimes called dipath[1]) is again a sequence of edges (or arcs) which connect a sequence of vertices, but with the added restriction that the edges all be directed in the same direction. Paths are fundamental concepts of graph theory, described in the introductory sections of most graph theory texts. See e.g. Bondy and Murty (1976), Gibbons (1985), or Diestel (2005). Korte et al. (1990) cover more advanced algorithmic topics concerning paths in graphs.Contents1 Definitions 2 Examples 3 Finding paths 4 See also 5 ReferencesDefinitions[edit] A path is a trail in which all vertices (except possibly the first and last) are distinct [...More...]  "Path (graph Theory)" on: Wikipedia Yahoo 

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 [...More...]  "Vertex (graph Theory)" on: Wikipedia Yahoo 