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Sentient (intelligence analysis system)
Sentient is a highly classified automated intelligence analysis system of the United States, run by the National Reconnaissance Office to detect patterns and anomalies and prioritize satellite tasking.
Sentiment analysis
Sentiment analysis, also called opinion mining, is the natural language processing task of identifying and classifying opinions, emotions, and attitudes in text by polarity such as positive, neutral, or negative.
Sentinel-1
Sentinel-1 is a two-satellite European radar Earth observation mission of the Copernicus program, launched from 2014, imaging Earth's surface day and night in all weather with C-band radar.
Sentinel-2
Sentinel-2 is a Copernicus Earth observation mission of pairs of identical satellites imaging Earth's land and coastal waters in 13 spectral bands every five days, with all data free.
Sentinel-3
Sentinel-3 is a European Earth observation satellite mission of the Copernicus program, developed by ESA and operated with EUMETSAT, measuring oceans, land, ice, and atmosphere; Sentinel-3A launched in 2016.
Sentinel-4
Sentinel-4 is a Copernicus Earth observation mission carrying a UVN spectrometer on the MTG-S1 satellite, launched in July 2025 to monitor European air quality hourly from geostationary orbit.
Sentinel-5P
Sentinel-5P, or Sentinel-5 Precursor, is a European Space Agency satellite launched in October 2017 from Plesetsk, Russia, carrying the TROPOMI instrument to map trace gases, aerosols, and ozone globally every day.
Sentinel-class cutter
The Sentinel-class cutter, also called the fast response cutter, is a 154-foot United States Coast Guard patrol craft built by Bollinger Shipyards that has replaced the older Island-class boats since 2012.
Seoincheon KOWEPO power station
Seoincheon KOWEPO power station (서인천발전본부) is an LNG combined-cycle power station in Seo-gu, Incheon, South Korea, owned by Korea Western Power, with eight 225 MW blocks totaling 1,878.9 MW.
Seok-Woo Jeon
Seok-Woo Jeon (전석우) is a South Korean materials scientist known for work on graphene, carbon nanotubes, and 3D nanostructures, and Eminent Professor at Korea University since 2023.
Seokguram Grotto and Bulguksa Temple
Seokguram Grotto and Bulguksa Temple (석굴암과 불국사): 8th-century Silla Buddhist monuments on Mount Tohamsan, Gyeongju, begun by Kim Dae-seong in 751, completed 774, Korea's first UNESCO World Heritage Site (1995).
Seongil Im
Seongil Im (임성일) is a South Korean applied physicist and materials scientist, a professor at Yonsei University known for work on thin-film transistors and 2D semiconductor devices.
Seongsu Bridge (성수대교)
The Seongsu Bridge (성수대교) is a road bridge across the Han River in Seoul whose 1994 collapse killed 32 people and prompted South Korea's infrastructure safety reforms.
Seoul Metro
Seoul Metro (서울교통공사) is the Seoul public corporation that operates the city's subway Lines 1 through 8, carrying about 6.6 million passengers a day after a 2017 merger.
Seoul Metropolitan Library
The Seoul Metropolitan Library (서울도서관) is the central public library of Seoul, South Korea, opened in 2012 in the former Seoul City Hall building at 110 Sejong-daero, Jung-gu.
Seoul Metropolitan Subway (수도권 전철)
The Seoul Metropolitan Subway (수도권 전철) is the urban rail network serving Seoul, Incheon, and Gyeonggi Province, opened in 1974 and among the world's busiest metro systems.
Seoul National University Hospital
Seoul National University Hospital (서울대학교병원, SNUH) is a university hospital and special corporation in Jongno-gu, Seoul, serving as South Korea's national central hospital; it was founded as Jejungwon in 1885.
Seoul Ring Expressway
The Seoul Ring Expressway (서울외곽순환고속도로), renamed the Capital Region First Ring Expressway in 2020, is a 127 km toll expressway forming a ring around Seoul, fully opened in December 2007.
Seoul Station (서울역)
Seoul Station (서울역), opened 1900 as Gyeongseong Station, is Seoul's main railway hub for KTX, the Airport Railroad, and subway Lines 1 and 4; its 1925 headhouse is now Culture Station Seoul 284, and the area hosts Seoullo 7017 and major redevelopment.
Seoul Subway Line 5 (서울 지하철 5호선)
Seoul Subway Line 5 (서울 지하철 5호선) is an east-west line of the Seoul Metropolitan Subway, running 52.3 km from Banghwa to Sangil-dong and Macheon with 51 stations.
Seoul waterworks
Seoul waterworks (서울 상수도) is the municipal system treating and piping drinking water in Seoul, South Korea, begun in 1908 and reaching full coverage in the 1990s.
Separate hydrolysis and fermentation
Separate hydrolysis and fermentation (SHF) is a cellulosic ethanol process in which enzymatic hydrolysis of pretreated biomass and fermentation of the released sugars run in separate reactors, each at its own optimum temperature.
Separate sewer system
A separate sewer system collects wastewater and stormwater in two distinct pipe networks: sanitary sewers send sewage to treatment, and storm sewers carry runoff to waterways.
Separation of concerns
Separation of concerns is a software design principle that divides a system into modules, layers, and encapsulations with independent roles, foundation of modularity from MVC to microservices.
Separation of storage and compute
Separation of storage and compute: cloud data architecture, also called decoupling or disaggregation, where query engines and object storage scale independently. Pioneered by BigQuery (2012) and Snowflake (2014); core pattern of lakehouses.
Separation principle
The separation principle is a control theory result stating that, for a linear system, the state feedback controller and the state observer can be designed independently while retaining stability or optimality.
Separation process
A separation process, also called separation of mixtures, is a chemical engineering unit operation that divides a mixture into distinct fractions using distillation, filtration, extraction, or crystallization.
Separative work unit
The separative work unit (SWU) is the standard measure of the effort required to separate isotopes of uranium during enrichment, with the dimension of mass, not energy.
SEPECAT Jaguar
The SEPECAT Jaguar is an Anglo-French twin-engine strike and trainer aircraft, first flown in 1968, that served with the Royal Air Force, the French Air Force, and India.
Sepehr-Jufair Oil Field
Sepehr-Jufair is a pair of onshore oil fields in Khuzestan Province, southwestern Iran, developed together under a 2018 contract and officially commissioned in March 2024 at 50,000 barrels per day.