What is "k-line"

alt. (context IRC English) The line in an (w: IRCd) configuration file that records the hostname of a banned user n. (context IRC English) The line in an (w: IRCd) configuration file that records the hostname of a banned user vb. (context transitive IRC English) To ban a user from a server

K-line may refer to:

• K Line, a Japanese shipping company
• K-Line, a model railway locomotive company
• K-line (artificial intelligence) (Knowledge-line), a mental agent in artificial intelligence
• K-Line bus operator in Yorkshire, England since rebranded as Tiger Blue
• K-line (IRC), a server ban in IRC
• K-line (spectrometry), a spectral peak in astronomical spectrometry
• K (Broadway Brooklyn Local), earlier KK, discontinued in 1976
• K (Eighth Avenue Local), a defunct train service on the New York City Subway, which was known as the AA until 1985
• K Ingleside, a service of the San Francisco Municipal Railway sometimes called the K Line
• K-Line, part of the ISO 9141 On Board Diagnostics vehicle network interface standard
• K line, the line marking the calculation point in ski jumping
• K line is a term used in Internal conversion electron spectroscopy.

A K-line, or Knowledge-line, is a mental agent which represents an association of a group of other mental agents found active when a subject solves a certain problem or formulates a new idea. These were first described in Marvin Minsky's essay K-lines: A Theory of Memory, published in 1980 in the journal Cognitive Science:

When you "get an idea," or "solve a problem" ... you create what we shall call a K-line. ... When that K-line is later "activated", it reactivates ... mental agencies, creating a partial mental state "resembling the original."

"Whenever you 'get a good idea', solve a problem, or have a memorable experience, you activate a K-line to 'represent' it. A K-line is a wirelike structure that attaches itself to whichever mental agents are active when you solve a problem or have a good idea.

When you activate that K-line later, the agents attached to it are aroused, putting you into a 'mental state' much like the one you were in when you solved that problem or got that idea. This should make it relatively easy for you to solve new, similar problems!" (1998, p. 82.)

The K-line is a spectral peak in astronomical spectrometry used, along with the L-line, to observe and describe the light spectrum of stars.

The K-line is associated with iron (Fe) and is described as being from emissions at ~6.14keV (thousands of electron volts).

On 5 October 2006 NASA announced the results of research using the Japanese JAXA Suzaku satellite, after earlier work with the XMM-Newton satellite. "The observations include clocking the speed of a black hole's spin rate and measuring the angle at which matter pours into the void, as well as evidence for a wall of X-ray light pulled back and flattened by gravity." The study teams observed X ray emissions from the "broad iron K line" near the event horizon of several super-massive black holes of galaxies called MCG-6-30-15 and MCG-5-23-16. The normally narrow K-line is broadened by the doppler shift ( red shift or blue shift) of the X ray light emitted by matter being affected by the gravity of the black hole. The results coincide with predictions Einstein's theory of general relativity. The teams were led by Andrew Fabian of Cambridge University, England, and James Reeves of NASA's Goddard Space Flight Center, Greenbelt, Maryland, United States.