Informatika No. 41 – 2013 . No. 41 ISSN 1419-2527 (Print) ISSN 2559-9593 (Online) informatika@gdf.hu . . KÁROLY KONDOROSI FOREWORD page 2 NORBERT ZSOLT ZENTAI – SÁNDOR KACZUR WHAT ARE THE SHADERS AND HOW THEY WORK? page 4 SÁNDOR KOPÁCSI APPLICATION OF 3D VISUALISATION IN INDUSTRY page 8 GÉZA BOGNÁR – GÁBOR SZÁSZ NEW WAYS IN THE LIGHT UAV DEVELOPMENT page 13 SÁNDOR KACZUR THE EFFICIENCY OF DATA VISUALIZATION SOFTWARE FOR PHYSIOBANK page 17 GÁBOR SZÁSZ – MIKLÓS GUBÁN – ANTÓNIA SZÁSZ NEW OPERATIONS IN THREE-VALUED LOGIC page 20 KATALIN GAMBÁR – FERENC MÁRKUS HEAT PROPAGATION DYNAMICS IN THIN CLASSICAL SEMICONDUCTORS page 24 BÁLINT MOLNÁR – GYULA SZABÓ – ANDRÁS BENCZÚR CLOUD COMPUTING IN PRACTICE page 29 .