Problems of Forensic Sciences 2009 Vol. 80 (LXXX) 481-486
EVALUATION OF EVIDENCE VALUE OF REFRACTIVE INDEX MEASURED BEFORE AND AFTER ANNEALING OF CONTAINER AND FLOAT GLASS FRAGMENTS
Grzegorz ZADORA 1, Dariusz WILK2, 3
1Institute of Forensic Research, Kraków, Poland
2Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Kraków, Poland
3Faculty of Law and Administration, Jagiellonian University, Kraków, Poland
Streszczenie
The application of Bayesian Network (BN) models to evaluation of the evidence value of refractive index values determined by the GRIM technique, measured before and after subjecting glass fragments to an annealing process, for the purpose of classification of glass fragments originating from containers, building and car windows, is presented in this paper. Optimal conditions of the annealing process (temperature program, annealing holder, oven) were selected, which allowed effective removing of tensions present in glass fragments. Bayesian Network models were satisfactorily applied in the classification of glass fragments in the situation where more than two glass categories were taken into account, i.e. car and building windows (making up the so-called “float glass” category) and containers.
Słowa kluczowe
Evidence values of refractive index of glass fragments; Annealing of glass fragments; Bayesian networks; Likelihood ratio; ¬Classification