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On-orbit measurements of spacecraft structural response are often desired or necessary for structural verification and loads prediction . Dr. Emkin s primary research interests are in the areas of structural engineering , matrix structural analysis , numerical methods , design of steel structures , structural optimization , advanced computer programming , computer applications , and large-scale software development . The research fields of the professorship Structural Steel and Timber Engineering under the direction of professor Dr. - Ing . For example , a wetland which is 80 percent shrub swamp ( woody structural group ) and 20 percent submergent and floating vegetation ( water structural group ) has this Class II characteristic . Earthquake engineering , structural dynamics , matrix structural analysis , hybrid control of structures , influence of nonstructural components on building response , vibrations , finite element analysis , mechanics of materials . A wetland which is 45 percent deciduous swamp ( woody structural group ) , 35 percent coniferous swamp ( also woody structural group ) , and 20 percent wet meadow ( herbaceous structural group ) does not have this Class II characteristic because although the woody structural group constitutes well over its minimum 25 percent of the wetland , the herbaceous structural group constitutes less than its minimum 25 percent of the wetland .