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Fault - Consequence Digraph 를 이용한 이상진단 전문가시스템의 지식 기반 구현
윤병석,오전근,윤인섭 ( Byung Suk Yoon,Jeon Kun Oh,En Sup Yoon ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1
The objective of this study is to implement the real time fault diagnostic expert system for the naphtha furnace process and to prove the effectiveness of Fault-Consequence Digraph(FCD) as a knowledge model. The FCD represents a quite simple graphical knowledge model of a hypothetical fault candidate. Since each fault occurring in the chemical process plant possesses the distinctive symptom pattern, the generated symptom pattern of a fault from a FCD can be checked whether it really occurs or not. The SUN3/260 workstation and the AI tool, KEE of IntelliCorp have been used in this study, which implements the FCD model. From qualitative reasoning in a naphtha furnace, 226 symptoms were generated and 314 fault-candidates were prepared. To implement this suggested FCD model, each FCD model has been tested by logical fault simulation. As a result of more than 20 case studies, the FCD model has been proven to be an appropriate and quite effective tool for the fault diagnostic expert system.
윤병석 ( Byung Seok Yoon ),김학철 ( Hak Chul Kim ),김용연 ( Yong Yeon Kim ),이상태 ( Sang Tae Lee ) 한국환경분석학회 2009 환경분석과 독성보건 Vol.12 No.3
In this study, two pretreatments method, i.e. freon extraction method and SPE(Solid Phase Extraction) method using a chelate disc were applied to the analysis of trace heavy metals in seawater. The recoveries of two pretreatment methods were compared and the concentrations of trace heavy metals seawater sample collected in Gosung were determined. To verify if the pretreatment methods under study could be used for seawater samples, CASS-4 SRM(Standard Reference Material) was analyzed and then the measured values and the certified values of SRM were compared to calculate recoveries. For chelate disc pretreatment method the recoveries of 9 elements except Cr and Zn were 80-120% while for freon extraction method the recoveries of 9 elements except Cu and Zn were 70-80%.