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A picture query language, extension of Sequel2.

["An Image-Oriented Database System", Y. Takao et al, in Database Techniques for Pictorial Applications, A. Blaser ed, pp. 527-538].
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add/drop multiplexer

A device installed at an intermediate point on a transmission line that enables new signals to come in and existing signals to go out. In a typical example, most signals pass through the device, but some would be "dropped" by splitting them from the line. Signals originating at that point can be "added" into the line and directed to another destination.

Add/drop multiplexing can be done with optical or electronic signals. The device may deal only with wavelengths, or it may convert between wavelengths and electronic TDM signals. The setup in an add/drop multiplexer is generally static, and the device is not reprogrammed very often. See TDM, DWDM, digital cross-connect, DCS and grooming.

Add/Drop Multiplexer
Note that the new signal being added can use the same optical channel (wavelength) as the dropped signal. (Illustration assistance courtesy of Jeff Hecht.)
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References in periodicals archive ?
Yamamoto, "Epithelial transient receptor potential ankyrin 1 (TRPA1)-dependent adrenomedullin upregulates blood flow in rat small intestine," American Journal of Physiology-Gastrointestinal and Liver Physiology, vol.
Kamiyoshi et al., "Regulation of adrenomedullin and its family peptide by RAMP system--lessons from genetically engineered mice," Current Protein & Peptide Science, vol.
The ability of Dll4/Notch signaling to modulate blood flow and subsequent vascular regression via angiotensin and adrenomedullin pathways represents a new mechanism by which this pathway modulates vascular development and remodeling [51].
Adrenomedullin (ADM) is a potent vasodilating peptide which is widely expressed and synthesized during sepsis.
Proietti et al., "Plasma adrenomedullin and endothelin-1 levels are reduced and Raynaud's phenomenon improved by daily tadalafil administration in male patients with Systemic Sclerosis," Journal of Biological Regulators and Homeostatic Agents, vol.
Role of adrenomedullin in the cerebrospinal fluid-contacting nucleus in the modulation of immobilization stress.
In several recent studies, markers indicating endothelial damage, such as thrombomodulin, adrenomedullin, and nitrite, have been found to be high in FMF patients in the non-attack period as well.
Furthermore, VEGF, endothelial nitric oxide synthase, nitric oxide and adrenomedullin were found to be down-regulated and correlated with impaired subendometrial blood flow (36).
Adrenomedullin (ADM) is attracting attention as a central component of the pathway that drives the anti-inflammatory action of DKT.
Adachi, "The role of adrenomedullin in obstructive sleep apnea," Hypertension Research, vol.