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  <xs:element name="LineOfCreditTwoMember" id="etcc_LineOfCreditTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="DebtInstrumentByReferenceAxis" id="etcc_DebtInstrumentByReferenceAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ReferenceNameDomain" id="etcc_ReferenceNameDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LiborMember" id="etcc_LiborMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="PrimeMember" id="etcc_PrimeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="NumberOfClassesOfCumulativeConvertibleParticipatingPreferredStock" id="etcc_NumberOfClassesOfCumulativeConvertibleParticipatingPreferredStock" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="PreferredStockStatedValuePerShare" id="etcc_PreferredStockStatedValuePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="OriginationFeePercentage" id="etcc_OriginationFeePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="OriginationFeeAmount" id="etcc_OriginationFeeAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="OriginationFeePaidInShares" id="etcc_OriginationFeePaidInShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="PreferredStockConversionPricePerShare" id="etcc_PreferredStockConversionPricePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="OriginationFeeExpressedAsMarketValueOfMarketableSecuritiesPledgedPercentage" id="etcc_OriginationFeeExpressedAsMarketValueOfMarketableSecuritiesPledgedPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfDaysPrecedingIssuanceOfShares" id="etcc_NumberOfDaysPrecedingIssuanceOfShares" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="NumberOfSeparateAgreementsIntoWhichEntityEnteredToRepurchaseAndRetirePreferredStock" id="etcc_NumberOfSeparateAgreementsIntoWhichEntityEnteredToRepurchaseAndRetirePreferredStock" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="CommonStockWarrantsAbstract" id="etcc_CommonStockWarrantsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="AmountOfGuaranteedLineOfCredit" id="etcc_AmountOfGuaranteedLineOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="ValueOfCommonStockAsPercentageOfNoteIssued" id="etcc_ValueOfCommonStockAsPercentageOfNoteIssued" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="ClassOfWarrantOrRightsExercisablePeriod" id="etcc_ClassOfWarrantOrRightsExercisablePeriod" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfDaysPrecedingIssuanceOfWarrants" id="etcc_NumberOfDaysPrecedingIssuanceOfWarrants" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="BaseRateMember" id="etcc_BaseRateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LongTermDebtAndCapitalLeaseObligationCurrentAndNoncurrentAbstract" id="etcc_LongTermDebtAndCapitalLeaseObligationCurrentAndNoncurrentAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="CurrentMember" id="etcc_CurrentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="TrainingServicesGroupMember" id="etcc_TrainingServicesGroupMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ControlSystemsGroupMember" id="etcc_ControlSystemsGroupMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ExpendituresForSegmentAssets" id="etcc_ExpendituresForSegmentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="KoreanGovernmentMember" id="etcc_KoreanGovernmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="DomesticCommercialCustomerMember" id="etcc_DomesticCommercialCustomerMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="InternationalCustomerMember" id="etcc_InternationalCustomerMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="USGovernmentMember" id="etcc_USGovernmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="NumberOfContractsToMajorCustomer" id="etcc_NumberOfContractsToMajorCustomer" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="TermLoanMember" id="etcc_TermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="PaymentsOfDeferredFinancingAndPreferredStockRepurchaseCost" id="etcc_PaymentsOfDeferredFinancingAndPreferredStockRepurchaseCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="TermLoanPeriod" id="etcc_TermLoanPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="ConversionOfVariableInterestRateToFixedInterestRate" id="etcc_ConversionOfVariableInterestRateToFixedInterestRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="LoanAgreementAbstract" id="etcc_LoanAgreementAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="OperatingLeverageRatio" id="etcc_OperatingLeverageRatio" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="EtcAndPncBankLoanAgreementMember" id="etcc_EtcAndPncBankLoanAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="SeriesDAndSeriesEPreferredStockMember" id="etcc_SeriesDAndSeriesEPreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="OperatingLeverageRatio1" id="etcc_OperatingLeverageRatio1" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="PreviousPreferredStockDividendRatePercentage" id="etcc_PreviousPreferredStockDividendRatePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="OperatingLeverageRatio2" id="etcc_OperatingLeverageRatio2" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="FixedChargeCoverageRatio" id="etcc_FixedChargeCoverageRatio" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="InterestRateSwapAbstract" id="etcc_InterestRateSwapAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="EtcAndLenfestPreferredStockRepurchaseAndFinancialRestructuringAgreementMember" id="etcc_EtcAndLenfestPreferredStockRepurchaseAndFinancialRestructuringAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LenfestCreditFacilityMember" id="etcc_LenfestCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
</xs:schema>
