▁of ▁the ▁Nav ier - Sto kes ▁equation ▁as ▁an ▁infinite ▁dimensional ▁dynam ical ▁system . ▁He ▁studied ▁in ▁particular ▁the ▁Cou ette ▁flow ▁( T aylor - C ou ette ) ▁and ▁discovered ▁there ▁theoret ically ▁several ▁wave forms , ▁which ▁were ▁later ▁confirmed ▁experiment ally . ▁He ▁collabor ated ▁with ▁A lain ▁Ch enc iner ▁on ▁b if ur cation ▁of ▁invariant ▁t ori . ▁Io oss , ▁with ▁Pierre ▁C oul let , ▁class ified ▁the ▁inst abilities ▁of ▁spatial ly ▁periodic ▁patterns ▁in ▁translation - in variant ▁and ▁mirror - sym metric ▁systems . ▁ ▁Io oss ▁was ▁elected ▁in ▁ 1 9 9 0 ▁a ▁corresponding ▁member ▁of ▁the ▁Ac adémie ▁des ▁sciences . ▁In ▁ 1 9 9 3 ▁he ▁received ▁the ▁. ▁He ▁received ▁in ▁ 2 0 0 8 ▁the ▁Prix ▁A mp ère ▁and ▁in ▁ 1 9 7 8 ▁the ▁Prix ▁Henri ▁de ▁Part ille ▁of ▁the ▁Ac adémie ▁des ▁sciences . ▁ ▁In ▁ 1 9 9 8 ▁he ▁was ▁Inv ited ▁Spe aker ▁with ▁talk ▁Tra vel ing ▁water ▁waves ▁as ▁a ▁parad ig m ▁for ▁b if ur c ations ▁in ▁revers ible ▁infinite ▁dimensional ▁dynam ical ▁systems ▁at ▁the ▁International ▁Congress ▁of ▁Mathemat icians ▁in ▁Berlin . ▁ ▁Selected ▁publications ▁ ▁Articles ▁ 1 9 7 9 ▁A . Ch enc iner , ▁G . I o oss . ▁B if ur c ations ▁de ▁t ores ▁invari ants . ▁Arch . ▁Rat . ▁Me ch . ▁Anal .