A comparison of the performance of humans and computational models in the classification of facial expression

Recognizing expressions are a key part of human social interaction, and processing of facial expression information is largely automatic for humans, but it is a non-trivial task for a computational system. In the first part of the experiment, we develop computational models capable of differentiating between two human facial expressions. We perform pre-processing by Gabor filters and dimensionality reduction using the methods: Principal Component Analysis, and Curvilinear Component Analysis. Subsequently the faces are classified using a Support Vector Machines. We also asked human subjects to classify these images and then we compared the performance of the humans and the computational models. The main result is that for the Gabor pre-processed model, the probability that an individual face was classified in the given class by the computational model is inversely proportional to the reaction time for the human subjects

Indoramin pregnancy in the treatment hypertension of A placebo-controlled trial comparing the efficacy of indoramin with alpha-methyldopa

A placebo-controlled trial was used to assess the antihypertensive efficacy of indoramin in the management of pregnancy hypertension. Sixty patients were recruited into the study and only 17 attained satisfactory blood pressure control. In the doses of drugs administered indoramin was not shown to be more effective than alpha-methyldopa

Podoconiosis pathogenesis: renewed use of an historical archive

No description supplie

The Formalisation Of Discourse Production

This paper describes a computer program which produces English discourse. The program is capable of describing in a sequence of English sentences any game of noughts-&-crosses (tic-tac-toe), whether given or actually played with the program. The object is to understand something of what a speaker is doing when he speaks, and the program therefore demonstrates the operation of rules for selecting information into sentences, for connecting sentences into a discourse, and for constructing clauses, groups, and words to convey the required information with the maximum possible economy. The program uses a systemic functional grammar to co-operate with semantic procedures in producing English. The grammar generates only a limited range of English, but one which is nonetheless sufficient to illustrate the advantages both theoretical and practical of such a grammar for a productive system. Many other computer programs have accepted more or less natural English input, usually in the form of questions requiring an answer, but few have been designed to produce natural English, particularly connected discourse. As a producing system the present model offers a view of language use from a viewpoint slightly different from that of its predecessors. However comprehension and production are dependent on each other, so that study of one may be expected to illuminate the other

Platelet count and liver function tests in proteinuric and chronic hypertension in pregnancy

Platelet counts and plasma enzyme estimations were performed in 207 pregnant patients with proteinuric hypertension and in 60 patients with chronic hypertension. Patients with abruptio placentae were excluded. In the proteinuric hypertensive patients a low platelet count « 150000/mm3 ) was found in 63 (30%) and elevated transaminase levels in 50 (24%) and both abnormalities were present in 47 patients (23%). The serum lactate dehydrogenase (LDH) value was mildly elevated in most proteinuric hypertensive women, but a markedly elevated LDH level ( > 400 IU/I) was usually associated with other evidence of liver necrosis. Raised plasma alkaline phosphatase and -y-glutamyhransferase levels were not related to the occurrence or severity of liver necrosis. In proteinuric hypertensive patients a low platelet count or elevated transaminase level was associated with deteriorating renal function, increased maternal morbidity, increased incidence of low-birth-weight babies and a raised perinatal mortality rate (149/1 000). In patients with chronic hypertension, 1 had a low platelet count but none had elevated transaminase, LDH or other enzyme levels and there was no recorded perinatal mortality

The moods and tenses of the verb in Xhosa

No abstract or keywords provided in dissertationAfrican LanguagesM.A. (Bantu Languages

Effects of diamagnetic levitation on bacterial growth in liquid

Diamagnetic levitation is a technique that uses a strong, spatially-varying magnetic field to levitate diamagnetic materials, such as water and biological cells. This technique has the potential to simulate aspects of weightlessness, on the Earth. In common with all ground-based techniques to simulate weightlessness, however, there are effects introduced by diamagnetic levitation that are not present in space. Since there have been few studies that systematically investigate these differences, diamagnetic levitation is not yet being fully exploited. For the first time, we critically assess the effect of diamagnetic levitation on a bacterial culture in liquid. We used a superconducting magnet to levitate growing bacterial cultures for up to 18 hours, in a series of experiments to determine the effect of diamagnetic levitation on all phases of the bacterial growth cycle. We find that diamagnetic levitation increases the rate of population growth in a liquid culture. The speed of sedimentation of the bacterial cells to the bottom of the container is considerably reduced. Further experiments and microarray gene analysis show that the growth enhancement is due to greater oxygen availability in the magnetically levitated sample. We demonstrate that the magnetic field that levitates the cells also induces convective stirring in the liquid, an effect not present in microgravity. We present a simple theoretical model, showing how the paramagnetic force on dissolved oxygen can cause the liquid to become unstable to convection when the consumption of oxygen by the bacteria generates an oxygen concentration gradient. We propose that this convection enhances oxygen availability by transporting oxygen around the sample. Since convection is absent in space, these results are of significant importance and timeliness to researchers considering using diamagnetic levitation to explore weightless effects on living organisms and a broad range of other topics in the physical and life sciences