"Function model"@en . "Engineering contradiction"@en . "TRIZ"@en . "Function analysis"@en . "55042e88822d8014d6f7364268987689" . "Ovidiu Bielefeld" . "Vacuum cleaner"@en . "Bielefeld" . . . "Model-Based Systems Engineering MBSE"@en . "Ovidiu" . "System model"@en .