Technology and the built world

Deep linking

Deep linking is the practice of linking directly to interior pages of a website or specific screens of a mobile app rather than the homepage or entry point.

Deep matrix factorization (DMF) is a machine learning method that represents a data matrix through a sequence of stacked linear factorizations, used in recommender systems, clustering, and image restoration.

Deep metric learning

Deep metric learning trains a deep neural network to map inputs into an embedding space where distances reflect semantic similarity, used for retrieval, verification, and clustering.

Deep operator network

A deep operator network, or DeepONet, is a neural network architecture in scientific machine learning that learns mappings between function spaces, approximating solutions of partial differential equations.

Deep packet inspection

Deep packet inspection (DPI): network technique examining packet payloads beyond L2/L3/L4 headers to identify applications, per ITU-T Y.2774. Used by ISPs for traffic shaping and QoS, by security systems for intrusion detection; limited by TLS encryption.

Oct 22, 2026

Deep Potential Smooth Edition

Deep Potential Smooth Edition (DeepPot-SE) is an end-to-end machine learning model of the inter-atomic potential energy surface, developed by Linfeng Zhang, Jiequn Han, and Weinan E, among others.

Deep Q-learning

Deep Q-learning is a reinforcement learning method using a deep neural network to approximate action values; its DQN agent reached human-level play on Atari games.

Deep Q-Network (DQN)

A Deep Q-Network (DQN) is a reinforcement learning agent from Google DeepMind, described in 2013 and in Nature in 2015, that learned 49 Atari games from raw pixels.

Deep reactive-ion etching

Deep reactive-ion etching (DRIE), commonly known as the Bosch process, is a plasma microfabrication technique that alternates etch and passivation steps to carve deep, vertical, high-aspect-ratio features into silicon, enabling MEMS sensors and through-silicon vias.

Deep reinforcement learning

Deep reinforcement learning, also known as deep RL, combines reinforcement learning with deep neural networks; DQN beat Atari games and AlphaGo defeated a Go world champion.

Deep representation learning

Deep representation learning trains neural networks to produce useful embeddings without labels, using self-supervised objectives grouped into predictive, contrastive, and generative families such as SimCLR and masked autoencoders.

Deep research agents

Deep research agents are autonomous LLM systems that plan a task, iteratively browse the live web, and synthesize results into long, cited reports, a category named by Google, OpenAI, xAI, and Perplexity in 2024 and 2025.

Deep Robotics Jueying

Jueying (绝影) is a family of quadruped robots developed by DEEP Robotics, a Hangzhou company founded in 2017, known for power substation inspection and named after Cao Cao's legendary horse.

Deep soil mixing

Deep soil mixing (DSM) is an in situ ground improvement technique that blends soil with cement or lime to form stronger, less permeable columns or walls.

Deep Space 1

Deep Space 1 was a NASA spacecraft launched in 1998 as the first New Millennium Program mission, testing ion propulsion and flying by asteroid Braille and comet Borrelly.

Deep Space Network

The Deep Space Network (DSN) is NASA's worldwide array of radio antennas for communicating with interplanetary spacecraft, managed by JPL and organized at three complexes: Goldstone, Madrid, and Canberra.

Deep stall

A deep stall, also known as a superstall or superstick, is a prolonged or unrecoverable stall in which the stalled wing's turbulent wake blanks the horizontal tail, leaving elevators ineffective, chiefly on T-tail aircraft.

Oct 22, 2026

Deep Synoptic Array

The Deep Synoptic Array is a planned Caltech-led radio telescope of 1,650 dishes in Nevada, designed to survey the sky and detect over a billion radio sources.

Deep ultraviolet lithography

Deep ultraviolet (DUV) lithography is a photolithography technique that patterns integrated circuits using 248 nm KrF and 193 nm ArF excimer lasers, long the leading chipmaking technology.

Deep unfolding network

A deep unfolding network, also called an unrolled network, is a neural network built by unrolling an optimization algorithm's iterations into layers with learnable parameters, used mainly for inverse problems like MRI reconstruction.

Deep web

The deep web, also called the invisible web or hidden web, is the part of the World Wide Web not indexed by standard search engines, including password-protected and database-driven pages.

Deep-level transient spectroscopy

Deep-level transient spectroscopy (DLTS) is a semiconductor characterization technique, introduced by D.V. Lang in 1974, that measures the energy levels and concentrations of deep-level defects from capacitance transients.

Deep-space optical communications

Deep-space optical communications is the use of near-infrared laser links, instead of radio, to send data between deep-space spacecraft and Earth, promising 10 to 100 times the data return for similar mass and power.

Deepakraj M. Divan

Deepakraj M. Divan is a power electronics engineer and Georgia Tech professor elected to the National Academy of Engineering in 2015, known for grid-forming inverter technology.

Deepal E07

The Deepal E07, sold in China as the Changan Nevo E07, is a battery-electric and extended-range crossover SUV produced since 2024 by Deepal, Changan Automobile's electric-vehicle brand.

Deepal G318

The Deepal G318 (深蓝G318) is a five-seat extended-range electric SUV from Changan's Deepal brand, launched in Tibet in June 2024 and named after China National Highway 318.

Deepal S05 (深蓝S05)

The Deepal S05 (深蓝S05) is a compact five-seat crossover SUV from Deepal, the new-energy brand of China's Changan Automobile, sold as a battery-electric or range-extended version since its October 2024 launch.

Deepal S07

The Deepal S07, also sold as the Shenlan S7, is a mid-size battery electric SUV built by China's Changan Automobile, and the first Deepal model in the UK, arriving in September 2025.