Gain
Gain may refer to:
Increase of quantity
People
Products
Music
Acronyms
Other uses
Gain (singer)
Ga-In (hangul: 가인) (born Son Ga-In (hangul: 손가인), September 20, 1987) is a South Korean singer, actress, and entertainer. She is best known as a member of the Korean pop music girl-group Brown Eyed Girls and for her appearances alongside Jo Kwon from 2AM for TV shows We Got Married and All My Love. As a solo artist she has released five EPs.
Music career
2005-09: Brown Eyed Girls & solo projects
Son Ga-In was noticed by the existing members of Brown Eyed Girls after she was eliminated during auditions for the popular South Korean reality series Let's Coke Play! Battle Shinhwa! She was approached by composer Ahn Jung Hoon and invited to audition at Brown Eyed Girls' company, eventually joining the group. The four members performed several small shows before officially debuting as Brown Eyed Girls in 2006. In the same year, she performed a duet "Must Have Love" with SG Wannabe's leader Kim Yong Jun, which became her first number one hit during the Christmas season.
Despite having initial successes, it was not until 2009 that her home group made a breakthrough into Korean mainstream with their hit song "Abracadabra", which was notable for the group's shift of their image and their new direction. After the unexpected success of the song, the group went on to become one of the most mentioned names of K-Pop girl-groups.
Gain (laser)
In laser physics, gain or amplification is a process where the medium transfers part of its energy to the emitted electromagnetic radiation, resulting in an increase in optical power. This is the basic principle of all lasers. Quantitatively, gain is a measure of the ability of a laser medium to increase optical power.
Definition
The gain can be defined as the derivative of logarithm of power 
as it passes through the medium:
where 
is the coordinate in the direction of propagation.
This equation neglects the effects of the transversal profile of beam.
In the quasi-monochromatic paraxial approximation, the gain can be taken into account with the following equation
where
is variation of index of refraction (Which is supposed to be small),
is complex field, related to the physical electric field
with relation
, where
is vector of polarization,
is wavenumber,
is frequency,
is transversal Laplacian;
means real part.
Gain in Quasi two-level system
In the simple quasi two-level system,
the gain can be expressed in terms of populations
and
of lower and excited states:
Subterfuge
For the concept of subterfuge, see Deception and Military deception. For the 1968 British film, see Subterfuge (film).
Subterfuge is a free and open source network security framework to demonstrate man-in-the-middle attacks and make it as simple as point and shoot. Subterfuge demonstrates vulnerabilities in the Address Resolution Protocol by harvesting credentials that go across the LAN, and even exploiting machines through client-side browser injection. It is capable of running on all distributions of Linux, but developer support is limited to Kali Linux. It is capable of leveraging multiple man-in-the-middle attacks against target networks.
Features
Subterfuge Features include:
Graphical interface
Subterfuge is known for its extremely modern web-based interface. The interface includes alternate perspectives for man-in-the-middle attacks through its unique network view. Subterfuge and its GUI’s purpose are primarily to demonstrate the dangers of man-in-the-middle attacks through their ease of employment with the framework itself.
Subterfuge (film)
Subterfuge is a 1968 British espionage film directed by Peter Graham Scott and starring Gene Barry, Joan Collins and Richard Todd.
Synopsis
A young wife is becoming very distraught over the fact that her husband, a secret service "spy" for Britain, has changed his mind about transferring away so that he can spend more time with her and their young son. He has grown cold and distant towards her; she thinks it's because of the secretiveness of his work. Meanwhile, a U.S spy comes to Britain and is induced to help the British "team" with an undercover spy ring...
Cast
Subterfuge (1912 film)
Subterfuge is a 1912 American silent film drama produced by Chauncey D. Herbert. The film stars Adrienne Kroell and Louise Reming. The film was released together with The Geisha Girls of Japan. The film status is uncertain but a release flier survives which is now at the Margaret Herrick Library at the Academy of Motion Pictures Arts and Sciences.
Plot
Podcasts:
