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Topics referred to by the same term
Sigmoidal or sigmoid, literally means S-shaped and can refer to: Sigmoid function Sigmoidal artery Sigmoid colon This disambiguation page lists articles
Sigmoidal
Mathematical function having a characteristic S-shaped curve or sigmoid curve
degenerate) will be sigmoidal. Thus the cumulative distribution functions for many common probability distributions are sigmoidal. One such example is
Sigmoid_function
Medical condition
Sigmoid colon volvulus, also known as sigmoid volvulus, is volvulus affecting the sigmoid colon. It is a common cause of bowel obstruction and constipation
Sigmoid_colon_volvulus
Enzyme kinetics and chemical bonding
deoxy-hemoglobin. This behavior leads the affinity curve of hemoglobin to be sigmoidal, rather than hyperbolic as with the monomeric myoglobin. By the same process
Cooperativity
Molecule-specific coordinate bonding area in biological systems
behavior of ligand to a protein. Curves can be characterized by their shape, sigmoidal or hyperbolic, which reflect whether or not the protein exhibits cooperative
Binding_site
Diagram showing the proportion of a receptor bound to a ligand
equation was originally formulated by Archibald Hill in 1910 to describe the sigmoidal O2 binding curve of hemoglobin. The binding of a ligand to a macromolecule
Hill_equation_(biochemistry)
Blood vessels
The sigmoid arteries are 2–5 branches of the inferior mesenteric artery that are distributed to the distal descending colon and the sigmoid colon. The
Sigmoid_arteries
Metalloprotein that binds with oxygen
for oxygen. As a consequence, the oxygen binding curve of hemoglobin is sigmoidal, or S-shaped, as opposed to the normal hyperbolic curve associated with
Hemoglobin
Model for flow conditions around rotating disk electrodes
Levich equation gives the height of the sigmoidal wave observed in rotating disk voltammetry. The sigmoidal wave height is often called the Levich current
Levich_equation
typically calculated. Because the typical growth pattern of a forest is sigmoidal, the MAI starts out small, increases to a maximum value as the trees mature
Mean_annual_increment
Property of artificial neural networks
Maiorov and Pinkus in 1999. They showed that there exists an analytic sigmoidal activation function such that two hidden layer neural networks with bounded
Universal approximation theorem
Universal_approximation_theorem
Image luminance mapping function
image is resized in a modified colorspace using the Sigmoidal Color Modifier Operator (-sigmoidal-contrast). This can reduce the clipping of extreme halo
Gamma_correction
Extinct genus of reptiles
lightly-built rauisuchian (an early relative of crocodilians) with a long, sigmoidally curved (S-shaped) neck, unlike the more typical robust short-necked rauisuchians
Dongusuchus
Type of basin in geology
causes the basin to sink down. Frequently, the basins are rhombic or sigmoidal in shape. Dimensionally, basins are limited to the distance between the
Pull-apart_basin
Mathematical function conceived as a crude model
oscillating activation functions with multiple zeros that outperform sigmoidal and ReLU-like activation functions on many tasks have also been recently
Artificial_neuron
Rock structures caused by shearing forces
Subsequent growth of the fracture therefore causes the vein to take on a sigmoidal shape. They can be used to determine the incremental kinematics of the
En_echelon_veins
Temperature graphs plotted against time
transforming to a cementite and ferrite mixture can be explained using the sigmoidal curve; for example the beginning of pearlitic transformation is represented
Isothermal transformation diagram
Isothermal_transformation_diagram
Cavity or socket of the skull in which the eye and its appendages are situated
a superior and an inferior oblique. The superior ophthalmic vein is a sigmoidal vessel along the superior margin of the orbital canal that drains deoxygenated
Orbit_(anatomy)
Computational model used in machine learning
OCLC 76538146. Cybenko G (2006). "Approximation by Superpositions of a Sigmoidal function". In van Schuppen JH (ed.). Mathematics of Control, Signals,
Neural network (machine learning)
Neural_network_(machine_learning)
Mollusc shell
is bent into an "s" curve it is called sinuous, as is the case in the sigmoidal margin of Janthina exigua. Interiorly when the lip has teeth it is dentate
Lip_(gastropod)
E. M., Ricklefs, R. E., Redford, K. H., & Mace, G. M. (1984). Fitting sigmoidal equations to mammalian growth curves. Journal of Mammalogy, 65(4), 607-636
List of mammalian gestation durations
List_of_mammalian_gestation_durations
Concentration of a compound where 50% of its maximal effect is observed
inhibition). Biological responses to ligand concentrations typically follow a sigmoidal function. The inflection point at which the increase in response with
EC50
Extinct genus of whales
the sigmoidal cavity; the presence of the elliptical foramen; horizontal sigmoidal cleft far anterior than the anterior margin of the sigmoidal process;
Toipahautea
Microsoft Excel add-in
models. Predefined categories include: Exponential/Log, Power Series, Sigmoidal, Hyperbolic, Yield Density, Linear, Polynomial, Dose Response, Pharmacology
XLfit
Description of constant-temperature solid phase changes
Transformations are often seen to follow a characteristic s-shaped, or sigmoidal, profile where the transformation rates are low at the beginning and the
Avrami_equation
Type of feedforward neural network
activation function. Cybenko, G. 1989. Approximation by superpositions of a sigmoidal function Mathematics of Control, Signals, and Systems, 2(4), 303–314.
Multilayer_perceptron
Mathematical functions
functions can fit a sigmoidal curve indicating that the slowest rate occurs at the early and late stages. In addition to the presenting sigmoidal shapes, it can
Hyperbolastic_functions
Clade of iguanodont dinosaurs
the following synapomorphies: the outline of the dorsal iliac margin is sigmoidal in dorsal view, with the postacetabular process deflected medialward and
Rhabdodontomorpha
Chemical reaction whose product is also its catalyst
autoxidation. Like many radical reactions, the rate vs time plot shows a sigmoidal behavior, characteristic of autocatalysis. Many reactions of organic compounds
Autocatalysis
Branch of machine learning
1888. Cybenko, G. (December 1989). "Approximation by superpositions of a sigmoidal function". Mathematics of Control, Signals, and Systems. 2 (4): 303–314
Deep_learning
Genus of molluscs (fossil)
as to expose all whorls which are covered with generally bifurcating sigmoidal ribs. The suture is ceratitid with two lateral lobes. Clionites differs
Clionites
Measure of organism response to stimulus
logarithm of the dose that is plotted on the X axis. The curve is typically sigmoidal, with the steepest portion in the middle. Biologically based models using
Dose–response_relationship
Hexahydrated calcium carbonate mineral
Identification Color White when pure Crystal habit Nearly square prism; pyramidal; sigmoidal: square prism capped with oppositely canted pyramids; massive, tubular
Ikaite
Machine learning calibration technique
effective for max-margin methods such as SVMs and boosted trees, which show sigmoidal distortions in their predicted probabilities, but has less of an effect
Platt_scaling
Extinct family of dinosaurs
piatnitzkysaurids also share some traits with allosaurids, such as a 'sigmoidal' humerus.[citation needed] If piatnitzkysaurids are megalosauroids, they
Piatnitzkysauridae
Emission of electrons when electromagnetic radiation hits a material
eVo, the following must hold eVo = Kmax. The current-voltage curve is sigmoidal, but its exact shape depends on the experimental geometry and the electrode
Photoelectric_effect
Analytical physical chemistry technique
curve of the thermogram must be sigmoidal. A steep sigmoidal curve signals a strong binding whereas a less steep sigmoidal curve points to a weaker binding
Isothermal titration calorimetry
Isothermal_titration_calorimetry
American research center, 1985–1995
MA: MIT press, 1986. Cybenko, G. Approximation by superpositions of a sigmoidal function. Math. Control Signal Systems 2, 303–314, 1989. LeCun, Yann,
University of Illinois Center for Supercomputing Research and Development
University_of_Illinois_Center_for_Supercomputing_Research_and_Development
Genus of molluscs (fossil)
Ceratitoidea. Badiotites is evolute, compressed, and discoidal, with sigmoidal ribs, an acutely rounded venter, and a goniatitic suture. It differs from
Badiotites
Extinct genus of dinosaurs
many autapomorphies, or unique features, of the skull, as well as the sigmoidal shape of the ulna (the lower arm bone) when viewed from the front or side
Amurosaurus
Order of molluscs
apex is coiled or cyrtoconic. The adult portion is straight or slightly sigmoidal and may be expanded. Growth lines show a deep hyponomic sinus and lateral
Lituitida
Genus of molluscs (fossil)
oxyconic ammonite with a fairly open umbilicus, serrated keel, and slightly sigmoidal ribs from the Lower Jurassic, many of which are strigate. Amaltheus, named
Amaltheus
Extinct genus of reptiles
lack a pronounced sigmoidal lateral border. Even though the margin has a considerable anterolateral projection, it remains sigmoidal. Moreover, the anterolateral
Scutarx
S-shaped curve
artificial neural networks with artificial neurons. Practitioners caution that sigmoidal functions which are antisymmetric about the origin (e.g. the hyperbolic
Logistic_function
Concept in physiology
experimentation, the Copenhagen group determined that the curve was in fact sigmoidal. Furthermore, in the process of plotting out numerous dissociation curves
Bohr_effect
Artificial neural network node function
LG]. Cybenko, G. (December 1989). "Approximation by superpositions of a sigmoidal function" (PDF). Mathematics of Control, Signals, and Systems. 2 (4):
Activation_function
Type of artificial neural network
Retrieved 2009-09-08. Cybenko, G. 1989. Approximation by superpositions of a sigmoidal function Mathematics of Control, Signals, and Systems, 2(4), 303–314.
Feedforward_neural_network
Genus of carcharodontosaurid dinosaur from the Early Cretaceous
that Acrocanthosaurus was a carcharodontosaurid. The brain was slightly sigmoidal (S-shaped), without much expansion of the cerebral hemispheres, more like
Acrocanthosaurus
Genus of molluscs (fossil)
basically evolute and highly ornamented with close spaced flexious, or sigmoidal, ribbing. The whorl section is compressed with straight sides and strongly
Anolcites
Molecular mechanism
oxygen as a function of the partial pressure of oxygen, he obtained a sigmoidal (or "S-shaped") curve. This indicates that the more oxygen is bound to
Cooperative_binding
to get activated quickly. Ultrasensitive responses are represented by sigmoidal graphs, which resemble cooperativity. The quantification of ultrasensitivity
Ultrasensitivity
Exhaust emission control device
the sensing of the changed air–fuel ratio by the sensor, as well as the sigmoidal response of the oxygen sensors. Typical control systems are designed to
Catalytic_converter
middle with parabolic lines and conspicuous parabolic nodes, outer with sigmoidal flairs; adult body chamber with ventrolateral spines. Sepkoski, Jack (2002)
Analytoceras
Body fossil
stalk, up to 17 mm (0.7 in) at its widest, with clear rectangular to sigmoidal first-order branches on either side, and due to the fine sandstone preservation
Akrophyllas
Visual tool used to understand how human blood carries and releases oxygen
the hemoglobin becomes saturated with oxygen. Hence, the curve has a sigmoidal or S-shape. At pressures above about 60 mmHg, the standard dissociation
Oxygen–hemoglobin dissociation curve
Oxygen–hemoglobin_dissociation_curve
American computer scientist
November 2022. Cybenko, G. (1989) "Approximations by superpositions of sigmoidal functions", Mathematics of Control, Signals, and Systems, 2(4), 303–314
George_Cybenko
Rock mass classification system
lower range. This is more realistic than relying on one sigmoidal equation. A number of sigmoidal equations have been proposed that give rock mass modulus
Rock_mass_rating
Extinct order of shelled animals
opercula with large, flat cardinal processes but without clavicles – tightly sigmoidal, sediment-filled intestine – helens absent. Sometimes the Circothecidae
Orthothecida
Extinct genus of reptiles
than sigmoidal, humeral shaft; bowed, rather than straight, radius; flat-bottomed rather than arced pubic foot; straight rather than sigmoidal femoral
Tanycolagreus
Type of activation function
Better gradient propagation: fewer vanishing gradient problems compared to sigmoidal activation functions that saturate in both directions. Efficiency: only
Rectified_linear_unit
Species of starfish
limiting factor on growth rate. The growth curves of size versus age were sigmoidal, as seen in majority marine invertebrates. An initial period of relatively
Crown-of-thorns_starfish
One of multiple small pouches in the colon which give it a segmented appearance
colon can be seen on abdominal x-ray during obstruction or volvulus. Sigmoidal volvolus, more often seen in psychiatric and neurologically impaired patients
Haustrum_(anatomy)
Bioinformatics method
Biochemically active amino acids tend to have wide buffer ranges and non-sigmoidal titration patterns. While the method predicts biochemically active amino
THEMATICS
Enzymes that change shape and activity
speaking, such cooperativity results in allosteric enzymes displaying a sigmoidal dependence on the concentration of their substrates in positively cooperative
Allosteric_enzyme
Attrition-enhanced deracemization
chlorate crystals in contact with their saturated solution in water. A sigmoidal (autocatalytic) increase in the solid-phase enantiomeric excess of the
Viedma_ripening
Extinct superfamily of ammonites
some tending to develop acute outer rims; generally with arcuate or sigmoidal ribs. Aptichus were found in place are double-valved. Hildoceratoidea
Hildoceratoidea
on type I collagen triple-helices will display a sigmoidal curve when plotted on a graph. The sigmoidal curve is divided into three phases; lag phase, growth
Fibrillogenesis
List of concepts in artificial intelligence
ISBN 978-0-12-238452-3. Cybenko, G. 1989. Approximation by superpositions of a sigmoidal function Mathematics of Control, Signals, and Systems, 2(4), 303–314.
Glossary of artificial intelligence
Glossary_of_artificial_intelligence
Light timing technique to simulate dawn
sunrise (but used in mid-winter when it is still dark outside), and a sigmoidal-shaped dawn (30 minutes to 2 hours). When used successfully, patients
Dawn_simulation
Convolutional neural network structure
\mathbb {R} } are trainable parameters, and σ {\displaystyle \sigma } is a sigmoidal activation function, sometimes called "LeCun's tanh". It is a scaled version
LeNet
Ejecta from the Sun's corona
S2CID 122151729. Canfield, Richard C.; Hudson, Hugh S.; McKenzie, David E. (1999). "Sigmoidal morphology and eruptive solar activity". Geophysical Research Letters
Coronal_mass_ejection
Quantitative measurement of the relative safety of a drug
late morbidity in cells of normal tissues. Both of these parameters have sigmoidal dose–response curves. Thus, a favorable outcome in dose–response for tumor
Therapeutic_index
Genus of molluscs (fossil)
the suture is very narrow, with straight, almost parallel or slightly sigmoidal sides. The first outer saddle is rounded and somewhat wider than ventral
Aquilonites
Genus of molluscs (fossil)
Arctohungerites is subdiscoidal, involute, with a rounded venter, weak sigmoidal folds on the body chamber and a distinct ventral keel on the distal end
Arctohungarites
Respiratory failure due to widespread inflammation in the lungs
defined as 'some' cmH 2O above the lower inflection point (LIP) in the sigmoidal pressure-volume relationship curve of the lung. Recent research has shown
Acute respiratory distress syndrome
Acute_respiratory_distress_syndrome
Species of legume
rather than true leaves. The decurrent phyllodes which are falcate or sigmoidal in shape and have a length of 1.5 to 5.5 cm (0.59 to 2.17 in) with a width
Acacia_triptera
Extinct genus of horseshoe crab relative
prominent sternal plate. Alanops was likely benthic, as it has long, thin, sigmoidally shaped legs which are ill-suited for swimming. These legs also have long
Alanops
Regulation of enzyme activity
increased affinity for GMP by the subsequent subunits as revealed by sigmoidal substrate versus velocity plots. A heterotropic allosteric modulator is
Allosteric_regulation
Extinct genus of theropod dinosaurs
distinctive proximodistally subrectangular distocentral denticles and a sigmoidal shape in distal view, seen also on Torvosaurus. Afrovenator had a flexible
Afrovenator
Cognitive science approach
ISSN 1476-4687. Cybenko, G. (1989-12-01). "Approximation by superpositions of a sigmoidal function". Mathematics of Control, Signals and Systems. 2 (4): 303–314
Connectionism
Press. "Artificial Intelligence and Machine Learning for Healthcare". Sigmoidal. 21 December 2017. Archived from the original on 17 August 2020. Retrieved
Artificial intelligence in healthcare
Artificial_intelligence_in_healthcare
Technique to capture HDR images and videos
Wyckoff's extended exposure response film. One can note that each curve has a sigmoidal shape and follows a hyperbolic tangent, or a logistic function characterized
Multi-exposure_HDR_capture
Probability distribution
case of a vector x which components sum up to one. In the case of x with sigmoidal elements, that is, when y = [ log ( x 1 1 − x 1 ) , … , log ( x D
Logit-normal_distribution
Genus of molluscs (fossil)
all whorls except for the outermost hidden from view, discoidal with sigmoidal ribs that branch on the sides and cross over the rounded venter. Sepkoski
Kammerkaroceras
Method of measuring the amount of energy absorbed by a material during fracture
behind the DBTT shift with strengthening composition. BCC metals show a sigmoidal Charpy energy versus temperature curve. The upper shelf is high, with
Charpy_impact_test
Notion in supervised machine learning
Macintyre, Angus (February 1997). "Polynomial Bounds for VC Dimension of Sigmoidal and General Pfaffian Neural Networks". Journal of Computer and System
Vapnik–Chervonenkis_dimension
Junction between motor neuron and muscle fiber
second α subunit for a second ACh ligand. AChRs, therefore, exhibit a sigmoidal dissociation curve due to this cooperative binding. The presence of the
Neuromuscular_junction
Genus of molluscs (fossil)
outer rim. Sides of the whorls are flattened to convex and covered with sigmoidal ribs that split on tubercles near the outer shoulder. there are two rows
Sirenites
Species of bacterium
causative agents of intestinal spirochetosis. Its cells are anaerobic, sigmoidal with tapered ends, 2 to 6 μm long. Four flagella are inserted at each
Brachyspira_aalborgi
MPF activity with respect to cyclin concentration, the model shows a sigmoidal shape, with a hypersensitive, threshold region similar to what was observed
Novak–Tyson_model
Protein complex on the surface of T cells that recognizes antigens
stimulation, the dose–response curve of ligand to cytokine production is sigmoidal. However, T-cell activation on a single cell level can be characterized
T-cell_receptor
Extinct genus of reptiles
pubic apron is convex when seen from the front. The femur (thigh bone) is sigmoidal (S-shaped), with the femoral head being twisted slightly inwards and the
Nundasuchus
RNA element
originally discovered, truncated version of the glycine riboswitch exhibits sigmoidal binding curves with Hill coefficients greater than one, which led to the
Glycine_riboswitch
Biochemical model of protein transitions
{\displaystyle K} coefficients in the Adair equation. This model explains sigmoidal binding properties (i.e. positive cooperativity) as change in concentration
Monod–Wyman–Changeux_model
Focusing ability of eye
K, Manny R. Minus-Lens–Stimulated Accommodative Amplitude Decreases Sigmoidally with Age: A Study of Objectively Measured Accommodative Amplitudes from
Accommodation (vertebrate eye)
Accommodation_(vertebrate_eye)
Biochemist from Sweden
Tb09374.X. PMID 3943521. Pettersson, G. (1986). "Mechanistic origin of the sigmoidal rate behaviour of glucokinase". Biochem. J. 233 (2): 347–350. doi:10.1042/Bj2330347
Gösta_Pettersson_(biochemist)
System with multiple fractal dimensions
to assess the scaling in a pattern. The graph is generally decreasing, sigmoidal around Q=0, where D(Q=0) ≥ D(Q=1) ≥ D(Q=2). As illustrated in the figure
Multifractal_system
Geologic discontinuity feature, often a joint or fault
tend to be hexagonal in shape. Sigmoidal Joints are joints that run parallel to each other, but are cut by sigmoidal (stretched S) joints in between
Fracture_(geology)
Insoluble protein aggregate with a fibrillar morphology
in the figure. When the quantity of fibrils is plotted versus time, a sigmoidal time course is observed reflecting the three distinct phases. In the simplest
Amyloid
Method of chemical analysis
the capillary. If the maximum currents of each drop were connected, a sigmoidal shape would result. The limiting current (the plateau on the sigmoid)
Polarography
SIGMOIDAL
SIGMOIDAL
SIGMOIDAL
SIGMOIDAL
Girl/Female
Swedish
Bitter.
Boy/Male
British, Christian, English, German
Brave Giver; Puffy-faced
Male
English
 English form of Anglo-Saxon Hreodbeorht, ROBERT means "bright fame." Compare with another form of Robert.
Boy/Male
Indian
New Generation
Boy/Male
Arabic, Muslim
A Title of the Prophet
Girl/Female
Danish, French, German, Hebrew
It Resembles Grass
Girl/Female
Assamese, Bengali, Hindu, Indian, Kannada, Marathi, Sindhi, Telugu
Anklet; Anklet of Lord Krishna
Boy/Male
Muslim/Islamic
A Prophet's name
Boy/Male
Muslim/Islamic
Ancient
Boy/Male
Sikh
SIGMOIDAL
SIGMOIDAL
SIGMOIDAL
SIGMOIDAL
SIGMOIDAL
a.
Alt. of Sigmoidal
a.
Curved in two directions, like the letter S, or the Greek /.
adv.
In a sigmoidal manner.