Recall (bugle call)

Recall is a bugle call used to signal to soldiers that duties or drills are to cease, or to indicate that a period of relaxation should end. Outside of a military context, it is used to signal when a game should end, such as a game of capture the flag among scouts.

History

Like other bugle calls, "recall" is a short tune that originated as a military signal announcing scheduled and certain non-scheduled events on a military installation, battlefield, or ship. Historically bugle calls indicated the change in daily routines of camp. A defining feature of a bugle call is that it consists only of notes from a single overtone series. This is in fact a requirement if it is to be playable on a bugle or equivalently on a trumpet without moving the valves.

References

Precision and recall

In pattern recognition and information retrieval with binary classification, precision (also called positive predictive value) is the fraction of retrieved instances that are relevant, while recall (also known as sensitivity) is the fraction of relevant instances that are retrieved. Both precision and recall are therefore based on an understanding and measure of relevance. Suppose a computer program for recognizing dogs in scenes from a video identifies 7 dogs in a scene containing 9 dogs and some cats. If 4 of the identifications are correct, but 3 are actually cats, the program's precision is 4/7 while its recall is 4/9. When a search engine returns 30 pages only 20 of which were relevant while failing to return 40 additional relevant pages, its precision is 20/30 = 2/3 while its recall is 20/60 = 1/3.

So, in this case, precision is 'how useful the search results are', and recall is 'how complete the results are'.

In statistics, if the null hypothesis is that all and only the relevant items are retrieved, absence of type I and type II errors corresponds respectively to maximum precision (no false positive) and maximum recall (no false negative). The above pattern recognition example contained 7 − 4 = 3 type I errors and 9 − 4 = 5 type II errors. Precision can be seen as a measure of exactness or quality, whereas recall is a measure of completeness or quantity.

Ram

Ram, ram, or RAM may refer to:

Used as a word (not as an initialism)

Animals

Military

Music

Other

People and characters

RealAudio

RealAudio is a proprietary audio format developed by RealNetworks and first released in April 1995. It uses a variety of audio codecs, ranging from low-bitrate formats that can be used over dialup modems, to high-fidelity formats for music. It can also be used as a streaming audio format, that is played at the same time as it is downloaded. In the past, many internet radio stations used RealAudio to stream their programming over the internet in real time. In recent years, however, the format has become less common and has given way to more popular audio formats. RealAudio was heavily used by the BBC websites until 2009, though it was discontinued due to its declining use. BBC World Service, the last of the BBC websites to use RealAudio, discontinued its usage in March 2011.

File extensions

RealAudio files were originally identified by a filename extension of .ra (for Real Audio). In 1997, RealNetworks also began offering a video format called RealVideo. The combination of the audio and video formats was called RealMedia and used the file extension .rm. However, the latest version of RealProducer, Real's flagship encoder, reverted to using .ra for audio-only files, and began using .rv for video files (with or without audio), and .rmvb for VBR video files. The .ram (Real Audio Metadata) and .smil (Synchronized Multimedia Integration Language) file formats are sometimes encountered as links from web pages (see Streaming Audio section below).

Goat (zodiac)

The Goat (Chinese: 羊; pinyin: yáng) is the eighth sign of the 12-year cycle of animals that appear in the Chinese zodiac related to the Chinese calendar. The sign is also referred to as the Ram or Sheep sign, since the Chinese word yáng is more accurately translated as Caprinae, a taxonomic subfamily which includes both sheep and goats.

The Year of the Goat (alternatively, Year of the Ram or Year of the Sheep) is associated with the 8th Earthly Branch symbol, 未 (wèi).

Goat or Sheep

The Chinese word yáng refers both to goats and sheep, with shānyáng specifically goats and miányáng sheep. In English, the sign (originally based on a horned animal) may be called either. The interpretation of sheep or goat depends on culture. In Vietnamese, the sign is mùi, which is unambiguously goat. In Japan, on the other hand, the sign is hitsuji, sheep; while in Korea and Mongolia the sign is also sheep or ram. Within China, there may be a regional distinction with the zodiacal yáng more likely to be thought of as a goat in the south, while tending to be thought of as a sheep in the north.