Examples of "pdag"
Every binary decision diagram (BDD) and every negation normal form (NNF) are also a PDAG with some particular properties. The following pictures represent the Boolean function formula_17:
Boolean functions are often represented by sentences in propositional logic, and sometimes as multivariate polynomials over GF(2), but more efficient representations are binary decision diagrams (BDD), negation normal forms, and propositional directed acyclic graphs (PDAG).
A propositional directed acyclic graph (PDAG) is a data structure that is used to represent a Boolean function. A Boolean function can be represented as a rooted, directed acyclic graph of the following form:
Chi "et al" presented pNovo+ in 2013 as a new de novo peptide sequencing tool by using complementary HCD and ETD tandem mass spectra. In this method, a component algorithm, pDAG, largely speeds up the acquisition time of peptide sequencing to 0.018s on average, which is three times as fast as the other popular de novo sequencing software.
In computer science, a binary decision diagram (BDD) or branching program is a data structure that is used to represent a Boolean function. On a more abstract level, BDDs can be considered as a compressed representation of sets or relations. Unlike other compressed representations, operations are performed directly on the compressed representation, i.e. without decompression. Other data structures used to represent a Boolean function include negation normal form (NNF), and propositional directed acyclic graph (PDAG).
"Chapters operating in different cities soon came to be classified into two broad tendencies: anti-corporate, or anti-capitalist. The former tended to be more reformist in orientation, more oriented towards the [nonviolence] tradition and suspicious of more militant styles of direct action, more interested in appealing to the middle classes around concepts like fair trade and green consumerism. The latter were more explicitly anarchist and revolutionary. The most prominent examples of the former tendency were Seattle DAN and LA DAN, both of which continued to be dominated by NGO activists...The vast majority of groups that were within the DAN network, however, including NYC DAN, the Philadelphia Direct Action Group (PDAG), San Francisco and Humboldt County DAN, Chicago DAN, and many others, were plainly anti-capitalist. They had little NGO participation, but were made up instead mainly of independent activists and members of local anarchist collectives..."
Methanol reformers are being considered as a component of a hydrogen fuel cell-powered vehicle. A prototype car, the NECAR 5, was introduced by Daimler-Chrysler in the year 2000. The primary advantage of a vehicle with a reformer is that it does not need a pressurized gas tank to store hydrogen fuel; instead methanol is stored as a liquid. The logistic implications of this are great; pressurized hydrogen is difficult to store and produce. Also, this could help ease the public's concern over the danger of hydrogen and thereby make fuel cell powered vehicles more attractive. However, methanol, like gasoline, is toxic and (of course) flammable. The cost of the PdAg membrane and its susceptibility to damage by temperature changes provide obstacles to adoption.