简介：Byusingthestrongcontinuoussemigrouptheoryoflinearoperatorsweprovetheexistenceofauniquepositivetime-dependentsolutionofthemodeldescribingare-pairable,standby,human&machinesystem.

简介：InthewakeoftheSeptember11,2001terroristattacks,thereisagrowingsenseofinsecurityfeltbymanycitizensaroundtheworld.Sustainablesecurity,withrootsinthesustainabledevelopmentandhumansecurityliterature,seekspositivetransformationsfortheco-evolvingandmutuallydependenthuman-environmentalconditionbyintegrating(andsubsuming)national,human,environmental,andenergysecurityconcernsandcapitalizingonopportunitiesprovidedbyhumancreativity,diplomaticopenings,modernizationandenvironmentalchange.ThefieldofSustainableSecuritySystemsEngineeringisproposedforprotecting,restoring,designing,andimplementingasetofintegratednaturalandman-madeprocessesthatequitablyandresponsiblymeetthebiophysicalneedsofhumancommunities,whilemaintaininglong-termsecurity,respectingfinancialconstraints,meetingecologicallimits,andimprovinginstitutionalarrangementsfortransparentandeffectivegovernance.Scenarioplanningisshowntohelppromotesustainablesecuritybyidentifyingthepreconditionsofinstabilityandhelpingtoproactivelyaddresstheminanincreasinglycomplexanduncertainworld.Thesixpaperspublishedinthisfeaturedcollectioncrosspolicydomains,geographic,political,andsectoralboundariesandwerediscussedatforumssponsoredbytheSystemsEngineeringandGlobalPolicygroup.Collectively,theydemonstratethequality,breadthanddepthofsystemsengineeringmethodologiesthatareusedtopromotesustainablesecurity.