All articles starting with D
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Decision feedback equalizer
A decision feedback equalizer (DFE) is a nonlinear equalizer, formalized in 1967, that cancels intersymbol interference by feeding past decisions back through a filter; its key weakness is error propagation.
Decision matrix
A decision matrix is a tabular decision-making tool, also called a selection matrix or criteria-based matrix, that scores options against weighted criteria to rank alternatives.
Decision Model and Notation
Decision Model and Notation (DMN) is an Object Management Group standard, first published in 2015, for modeling business decisions and rules using decision tables and the FEEL expression language.
Decision problem
Decision problem: yes/no computational task over inputs (Entscheidungsproblem, German for decision problem). Central to computability and complexity theory; halting problem and first-order validity are undecidable (Church, Turing 1936).
Decision problems for formal languages
Decision problems for formal languages ask whether emptiness, membership, and equivalence are decidable: all are decidable for regular languages, but equivalence and inclusion are undecidable for context-free grammars.
Decision support system
A decision support system (DSS), or decision support software, is an interactive computer-based system that aids judgment and choice rather than replacing the decision maker's judgment.
Decision table
A decision table is a rule-based classifier that stores labeled instances in a table of conditions and outcomes, classifying new instances by looking up the matching cell's majority class.
Decision theory
Decision theory studies rational and actual choice under uncertainty. Its three branches, normative, descriptive, and prescriptive, center on expected utility theory and its challenges, including the Allais and Ellsberg paradoxes.
Decision threshold
A decision threshold is a measurement value above which a physical effect, such as low-level radioactivity, is declared present, defined in the ISO 11929 standards.
Decision to Leave (헤어질 결심)
Decision to Leave (헤어질 결심) is Park Chan-wook's 2022 Korean romantic mystery film starring Park Hae-il and Tang Wei; it won Best Director at the 75th Cannes Film Festival and swept 2022 Korean awards.
Decision Transformer
Decision Transformer is a 2021 reinforcement learning architecture by Lili Chen, Kevin Lu, and colleagues that casts RL as sequence modeling with a GPT-style Transformer trained on offline trajectories.
Decision tree
A decision tree is a machine learning model that predicts outcomes by recursively splitting data with simple feature questions, used for classification and regression tasks.
Decision tree learning
Decision tree learning is a supervised machine learning method that builds a predictive model as a tree of feature tests, handling classification and regression, and used in ensembles like random forests.
Decision tree model
The decision tree model is a supervised learning model that predicts by learning a hierarchy of decision rules, each node testing a feature and each leaf giving a prediction.
Decision Trees
Decision trees: branching diagrams of decision nodes (squares), chance nodes (circles), probabilities summing to 1.0, and valued outcomes, used in clinical decision analysis, health economics, and machine learning classification.
Decision-directed channel equalization
Decision-directed channel equalization is an adaptive equalization mode where the receiver uses its own detected symbols instead of a known training sequence, avoiding the bandwidth cost of retraining.
Decision-directed channel estimation
Decision-directed channel estimation (DDCE) is a receiver technique that treats its own detected, re-modulated data symbols as pilots to refine the channel estimate without extra training overhead.
Decision-directed equalization
Decision-directed equalization is an adaptive equalization mode in which a receiver replaces the training sequence with its own detected symbols as the reference for continued adaptation, letting the equalizer track the channel without repeated known data.
Decision-focused learning
Decision-focused learning (DFL) is a machine learning approach that trains a predictive model end-to-end so its predictions lead to good decisions in a downstream optimization problem.
Decision-making
Decision-making, also called the decision-making process or choice making, is the selection of one course of action from alternatives when outcomes are uncertain, studied across psychology, economics, and neuroscience.
DECIST trial
DECIST (Dapagliflozin Effect in Cognitive Impairment in Stroke Trial), NCT05565976, a phase 2/3 randomized trial at Universidad de Guanajuato, Mexico, testing 12 months of dapagliflozin 10 mg daily on cognition after ischemic stroke; 270 planned participants, no results posted.
Decitabine
Decitabine, first synthesized in 1964, is a hypomethylating chemotherapy drug used for myelodysplastic syndromes and acute myeloid leukemia, given intravenously as Dacogen or orally with cedazuridine as Inqovi.
Decius
Decius (Gaius Messius Quintus Trajanus Decius, c. 201–251), Roman emperor 249–251, usurper against Philip the Arab, issuer of the empire-wide sacrifice edict behind the first empire-wide persecution of Christians, killed by Goths at Abrittus.
Deck (building)
A deck, also called timber decking, is an outdoor platform attached to a house or free-standing, built on beams and joists and surfaced with decking boards.
Deck (ship)
A deck is a horizontal structure in a ship that serves as a floor, with many decks stacked one above another and named for their position or function.
Deck arch bridge
A deck arch bridge is an arch bridge whose roadway lies completely above the arch, carried on masonry fill or spandrel columns, as in closed- and open-spandrel forms.
Deck department
The deck department is the shipboard division of a merchant vessel responsible for navigation, cargo handling, security, and maintenance, headed by the Master, who holds overall command.
Deck the Halls
"Deck the Halls", originally "Deck the Hall", is a Christmas carol set to the Welsh New Year's Eve tune Nos Galan, with English words by Thomas Oliphant published in 1862 in Welsh Melodies, its fa-la-la refrain inherited from Welsh verse-singing, and the 1862 composition in the public domain.
Deck the Halls (2006 film)
Deck the Halls is a 2006 American Christmas comedy directed by John Whitesell, starring Matthew Broderick and Danny DeVito as feuding neighbors, released by 20th Century Fox.
Decker
Decker is a Tim Heidecker and Gregg Turkington Adult Swim action parody (2014-2017), an On Cinema spinoff about agent Jack Decker; distinct from ABC's 2026 crime drama RJ Decker.