We study the problem of finding Löwner–John ellipsoid (i.e., an with minimum volume that contains a given convex set). reformulate as generalized copositive program and use reformulation to derive tractable semidefinite programming approximations for instances where set is defined by affine quadratic inequalities. prove that, when underlying polytope, our method never provides higher than one o...

Food allergy affects millions worldwide.1 Vigilance by affected individuals and families is necessary to prevent accidental ingestions, allergic reactions, anaphylaxis. Understanding the minimum amount of food allergen that elicits a reaction—thresholds—in susceptible paramount inform safe practice, manufacturing, public health policy.1 Thresholds can also how optimize challenge schedules, advi...

PURPOSE To determine the intrarater-reliability, interrater-reliability and normal reference scores of the Semmes Weinstein Monofilament test (SWM) of the feet of healthy subjects. In addition, the stability of the SWM for prospective use was assessed by determining systematic changes in sensory thresholds. METHODS Interrater-reliability was assessed on five locations of the plantar side of b...

Different models of the binaural system make different predictions for the just-detectable interaural time difference (ITD) for sine tones. To test these models, ITD thresholds were measured for human listeners focusing on high- and low-frequency regions. The measured thresholds exhibited a minimum between 700 and 1,000 Hz. As the frequency increased above 1,000 Hz, thresholds rose faster than ...

While most positional acuity tasks exhibit an age-related decline in performance, the effect of ageing upon vernier acuity continues to be the subject of some debate. In the present study we employed a stimulus design that enabled the simultaneous determination of bisection and vernier acuities in 36 subjects, aged between 22 and 84 years. This approach provided a means for directly testing the...

the purpose of this study is to identify the effect of ordinary kriging (ok) and inverse distance weighted (idw) estimation methods for the delineation of mineralized zones based on subsurface data using concentration–volume (c–v) multifractal modeling in the dardevey iron ore deposit, ne iran. variograms and anisotropic ellipsoid were generated for the fe distribution by the above estimation m...

We have examined vernier acuity using sinusoidal luminance gratings. Vernier thresholds were affected by both grating contrast and spatial frequency. With fixed (50%) contrast gratings, vernier thresholds reached minimum values of approximately 10 sec of arc at spatial frequencies between 6 and 16 c/deg. Vernier thresholds for all spatial frequencies are related to contrast by a power law with ...

Cutaneous sensory thresholds were measured at the index fingertipof eight normal subjects. Electric shocks were applied with the finger at rest or tracking a target, which oscillated at one of three frequencies. For each subject, the sensory threshold was positively correlated with the frequency of oscillation. The correlations between sensory suppression and speed of movement agree with previo...

Potelunas, Meixner and Hardy (1) suggested the possibility that the pain threshold was not uniform in all areas of the body when they found wide variation in such thresholds in normal and pathological skin. Bishop (2) reported that the number, distribution and accessibility of the sensory receptors of the skin varied in different areas. The cutaneous sensory threshold was shown by the author (3...

The vestibular system is our sixth sense and is important for spatial perception functions, yet the sensory detection and discrimination properties of vestibular neurons remain relatively unexplored. Here we have used signal detection theory to measure detection thresholds of otolith afferents using 1 Hz linear accelerations delivered along three cardinal axes. Direction detection thresholds we...