In a general combinatorial search problem with binary tests we are given a set of elements and a hypergraph of possible tests, and the goal is to find an unknown target element using a minimum number of tests. We explore the expected test number of randomized strategies. We obtain several general results on the ratio of the expected and worst-case deterministic test number, as well as complexit...

in this investigation, the effects of enclosure, restal delayed grazing andcontinued grazing treatments on the production rate and vegetation cover were studied.study area was sadrabad pasture. after selecting three bands (1+1+1=3 hectare area) asthree treatments in the restricted and non restricted area, they were transected to threetransects. then plots (1×2m2 ) were selected to measure the p...

The cover test is indispensable when assessing a patient with a suspected squint. This article reviews how the cover test is performed and also the limitations of the cover test. Further, information is provided on how to interpret the clinical signs derived from the cover test. Indeed, much about the squint nature, fixation pattern and fusion strength of the patient can be learnt from the cove...

In a typical covering problem we are given a universe U of size n, a family S (S could be given implicitly) of sizem and an integer k and the objective is to check whether there exists a subfamily S ′ ⊆ S of size at most k satisfying some desired properties. If S ′ is required to contain all the elements of U then it corresponds to the classical Set Cover problem. On the other hand if we requir...

purpose: to compare the effect of different deviation measurement techniques and different lens powers on gradient accommodative convergence to accommodation (ac/a) ratio. methods: we randomly selected 78 eligible students of different majors from zahedan university of medical sciences. following retinoscopy for refractive errors, alternate prism cover test, von graefe and maddox rod without ad...

The dynamics of unilateral cover test eye movements, never before systematically investigated with an objective recording system, are shown to be more complex than textbook accounts of them. We administered the cover test to nine heterophoric subjects by means of electromechanical occluders. Eye movements were recorded using the infrared photoelectric technique. Saccadic and vergence movements ...

We describe the structure of the unique minimal test set T for a family of vertex cover problems. The set T corresponds to the Gröbner basis of the binomial ideal for the problem as described in [1]. While T has a surprisingly simple structure, in particular when the underlying graph is complete, it is NP -complete to decide whether the test set contains an improving element for a given feasibl...