Sökning: "Olof Barr"

Hittade 2 avhandlingar innehållade orden Olof Barr.

  1. 1. Discrete Methods used in Graph Theory and Linear Programming

    Författare :Olof Barr; Matematik LTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Perceptron Algorithm; Graph Theory; Linear Programming; Matematik;

    Sammanfattning : The content of the thesis is divided into two parts; graph theory and linear programming. The main results in the first part concerns extremal graph theory. Here we want to determine the number of edges in a graph needed to ensure the existence of certain local structures. LÄS MER

  3. 2. Etiological insights into the testicular cancer epidemic

    Författare :Olof Akre; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Testicular neoplasms; seminoma; nonseminoma; epidemiology; etiology; risk factors; prenatal; fertility; birth weight; placenta; neonatal jaundice; cryptorchidism; hypospadias; preterm birth; Epstein-Barr virus; cytomegalovirus; Body Mass Index; height;

    Sammanfattning : The aim of this thesis was to search for causes of the testicular cancer epidemic through epidemiologic studies of testicular cancer and possibly related conditions, such as urogenital birth defects and subfertility. First, we assessed changes in fertility over time by studying time-to-pregnancy among primiparous women in Sweden from 1983 through 1993 using data from the Medical Birth Registry. LÄS MER