ABSTRACT
This article presents an improved morphological image representation that can be used for image compression, obtaining very high compression rates. The new image representation described in this work is called skeleton structure and is a natural extension of the morphologic structure. This article will present its theoretical background, introduce the new representation, and show some application examples.
Subject(s)
Algorithms , Image Processing, Computer-Assisted , HumansABSTRACT
A feed-forward neural network is used for diagnosis of spastic paralysis. It is a two-layer perceptron and it is able to classify two kinds of myoelectric signal recorded in surface electromyography: the normal EMG and the EMG in the case of spastic paralysis. The myoelectric signal was recorded with a surface electrode pair and sampled at 10 kHz. The EMG activity is stochastic and the instantaneous amplitude distribution for a fixed level of contraction is Gaussian. The signal variance is considered a measure of muscle force. We can describe any kind of this process by the AR model. For a precisely modeling of EMG there are necessary many AR model parameters. In the classification problem we have it is not necessary to use a high order AR model. We find a 4-th order AR model is good enough for this study. The Hopfield algorithm is used to calculate the parameters of the autoregressive model.
Subject(s)
Electromyography , Neural Networks, Computer , Signal Processing, Computer-Assisted , Electrodes , Hemiplegia/diagnosis , Humans , Reference ValuesABSTRACT
Our aim was to use a neural network model for classifying psychiatric mood disorders. In approaching this interdisciplinary task, the concern was not to build a more biologically plausible model, but to test the computational capabilities of an existent one. The multilayer perceptron was chosen as a model, trained and tested using both theoretical and real cases. The classification proved to be good, but we are aware of the fact that both training and testing should be performed in the future only on real data, as the way to get a true picture of the system's performance.
Subject(s)
Affective Disorders, Psychotic/classification , Diagnosis, Computer-Assisted , Neural Networks, Computer , Adult , Diagnostic Errors , Female , Humans , Medical History Taking , Middle Aged , Reproducibility of Results , Surveys and Questionnaires , User-Computer InterfaceABSTRACT
The results of an epidemiological and laboratory investigation on 242 adults and children, who had come in contact with patients suffering from viral hepatitis (in the family or outside it), showed the importance of family contact and the role of routes of transmission other than the parenteral and transfusional ones in viral hepatitis with positive HB antigen. Attention is likewise drawn to the importance of the laboratory tests (classical enzymatic tests and immunoelectrodiffusion) in the detection of epidemogenic sources, represented by the subclinical forms of infection.
Subject(s)
Hepatitis, Viral, Human/transmission , Epidemiologic Methods , Hepatitis B Antigens/analysis , Hepatitis, Viral, Human/genetics , Humans , RomaniaSubject(s)
Hepatitis B/epidemiology , Adult , Age Factors , Female , Hepatitis B/diagnosis , Humans , Male , Middle Aged , Romania , Sex FactorsABSTRACT
From over 800 patients with chronic hepatic diseases admitted to the Institute of Internal Medicine between 1960-1969 and in whom diagnosis was assessed by hepatic biopuncture, 180 were reexamined 3-14 years later to estimate the clinical evolution and the prognostic value of the bioptic findings. The evolution was favourable in most of the cases of persistent chronic hepatitis (70%) and of moderate aggressive chronic hepatitis (59%). Severe aggressive chronic hepatitis evaluated favourably in 34% of the cases and was aggravated in 42% of the cases (26% exits). In the patients with cirrhosis the percentage of deaths reached 65 but 30% were still in a stationary form; a single exceptional case was improved 7 years after the hepatic biopuncture. The prognostic value of hepatic biopuncture is much increased if, in addition to the common histological features, other histochemical and morphological criteria such as: structural stability of collagen fibers, importance of cellular infiltrates and presence of plasma cells, nuclear changes, degree of steatosis, amount of glycogen storage, siderosis and cholestasis are also taken into consideration.
Subject(s)
Hepatitis , Biopsy, Needle , Chronic Disease , Follow-Up Studies , Hepatitis/complications , Hepatitis/diagnosis , Hepatitis/pathology , Humans , Liver/pathology , Liver Cirrhosis/complications , Liver Cirrhosis/pathology , PrognosisABSTRACT
To perform the ever increasing number of analyses with a minimum equipment the tendency all over the world is now to replace the classical tests with screening tests. The laboratory of enzymology of the Institute of Internal Medicine has achieved screening tests for the estimation of alkaline phosphatase, of total lactatedehydrogenase and of its fraction I, whose results are in agreement with the reference methods of Bessy-Lowry-Brock and of Lac-Dehystrate-Goedecke in cases of acute and chronic liver diseases, neoplasms, bone diseases (Paget's disease) and myocardial infarction.
