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Çѱ¹¼öÀÚ¿øÇÐȸ / v.40, no.1, 2007³â, pp.39-50
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»ó¼öµµ ÁÖö ¹è¼ö°ü·ÎÀÇ ÆÄ¼ÕÀÚ·á À¯Çü¿¡ µû¸¥ ÆÄ¼ÕÀ² ¸ðÇüÈ¿Í ¼öÁ¤µÈ ½Ã°£Ã´µµ¸¦ ÀÌ¿ëÇÑ ÃÖÀû±³Ã¼½Ã±âÀÇ »êÁ¤
( Modeling of Rate-of-Occurrence-of-Failure According to the Failure Data Type of Water Distribution Cast Iron Pipes and Estimation of Optimal Replacement Time Using the Modified Time Scale ) |
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º» ³í¹®¿¡¼´Â ´ë¼ö-¼±Çü ÆÄ¼ÕÀ² ¸ðÇü(log-linear ROCOF)°ú ¿ÍÀÌºí ÆÄ¼ÖÀ² ¸ðÇü(Weibull ROCOF)À» ÀÌ¿ëÇÏ¿© »ó¼öµµ ÁÖö ¹è¼ö°ü·ÎÀÇ ÆÄ¼ÕÀ²À» ¸ðÇüÈÇϰí, '¼öÁ¤µÈ ½Ã°£ ôµµ'¸¦ ÀÌ¿ëÇÏ¿© ÃÖÀû±³Ã¼½Ã±â¸¦ »êÁ¤ÇÒ ¼ö ÀÖ´Â ¹æ¹ýÀÌ °³¹ßµÇ¾ú´Ù. µÎ ROCOFÀÇ ¸ðÇüȸ¦ À§ÇÏ¿© °³º° °ü·ÎÀÇ ÆÄ¼Õ½Ã°£À» ±â·ÏÇÑ 'ÆÄ¼Õ ½Ã°£ÀÚ·á(failure-time data)'¿Í ÀÏÁ¤ ½Ã°£°£°Ý »çÀÌ¿¡¼ ¹ß»ýÇÏ´Â ÆÄ¼ÕȽ¼ö¸¦ ±â·ÏÇÑ 'ÆÄ¼Õ Ƚ¼öÀÚ·á(failure-number data)'¸¦ ÀÌ¿ëÇÏ¿´°í, ÃÖ´ë·Î±×¿ìµµ ÃßÁ¤°ªÀ» ÀÌ¿ëÇÏ¿© µÎ ROCOFÀÇ °¢ ÆÄ¼ÕÀÚ·á À¯Çü¿¡ ´ëÇÑ ¸ðÇüÈ ¼öÇà ´É·ÂÀ» °ËÁõÇÏ¿´´Ù. ¶ÇÇÑ µÎ ROCOF¸¦ ÀÌ¿ëÇÑ °ü·ÎÀÇ ÃÖÀû±³Ã¼½Ã±â ¹æÁ¤½ÄÀº ROCOFÀÇ ¸Å°³º¯¼ö ÃßÁ¤¿¡ ÀÖ¾î¼ ¼ö·Å¼ºÀ» º¸ÀåÇϱâ À§ÇÏ¿© '¼öÁ¤µÈ ½Ã°£ ôµµ'¸¦ Àû¿ëÇÏ¿© À¯µµÇÏ¿´´Ù. ¿¬±¸´ë»ó ÁÖö ¹è¼ö °ü·ÎµéÀÇ 'ÆÄ¼Õ ½Ã°£ÀÚ·á'¿Í 'ÆÄ¼Õ Ƚ¼öÀÚ·á'¿¡ µÎ ÆÄ¼ÕÀ² ¸ðÇüÀ» Àû¿ë½ÃÄÑ º» °á°ú ÆÄ¼Õ ½Ã°£ÀڷḦ ÀÌ¿ëÇÒ °æ¿ì ´ë¼ö-¼±Çü ROCOF°¡ ¿ÍÀ̺í ROCOF º¸´Ù ÀûÇÕÇÑ ¸ðÇüÀÎ °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ¶ÇÇÑ µÎ ¸ðÇü ¸ðµÎ 'ÆÄ¼Õ ½Ã°£ÀÚ·á'¸¦ ÀÌ¿ëÇÏ´Â °ÍÀÌ 'ÆÄ¼Õ Ƚ¼öÀÚ·á'¸¦ ÀÌ¿ëÇÏ´Â °Íº¸´Ù ¸ðÇüÈ ¼öÇà ´É·ÂÀÌ ³ô¾ÆÁö´Â °ÍÀ¸·Î ³ªÅ¸³ª¼, ºÐ¼®¿¡ »ç¿ëµÈ °ü·ÎÀÇ ÆÄ¼ÕÀ² ¸ðÇüÈ¿Í ÃÖÀû±³Ã¼½Ã±â »êÁ¤À» À§Çؼ´Â ÀÏÁ¤ ½Ã°£°£°Ý µ¿¾ÈÀÇ °ü·Î ÆÄ¼ÕȽ¼ö¸¦ ±â·ÏÇÏ´Â °Íº¸´Ù °ü·ÎÀÇ ÆÄ¼Õ½Ã°£À» ±â·ÏÇÏ´Â °ÍÀÌ ´õ¿í ¿ì¼öÇÑ ¸ðÇüÈ °á°ú¸¦ ³º´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. |
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This paper presents applications of the log-linear ROCOF(rate-of-occurrence-of-failure) and the Weibull ROCOF to model the failure rate of individual cast iron pipes in a water distribution system and provides a method of estimating the economically optimal replacement time of the pipes using the 'modified time-scale'. The performance of the two ROCOFs is examined using the maximized log-likelihood estimates of the ROCOFs for the two types of failure data: 'failure-time data' and 'failure-number data'. The optimal replacement time equations for the two models are developed by applying the 'modified time-scale' to ensure the numerical convergence of the estimated values of the model parameters. The methodology is applied to the case study water distribution cast iron pipes and it is found that the log-linear ROCOF has better modeling capability than the Weibull ROCOF when the 'failure-time data' is used. Furthermore, the 'failure-time data' is determined to be more appropriate for both ROCOFs compared to the 'failure-number data' in terms of the ROCOF modeling performances for the water mains under study, implying that recording each failure time results in better modeling of the failure rate than recording failure numbers in some time intervals. |
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Ű¿öµå |
»ó¼ö°ü·Î;ÆÄ¼ÕÀÚ·á;´ë¼ö-¼±Çü ROCOF;¿ÍÀ̺í ROCOF;ÃÖÀû±³Ã¼½Ã±â;water main;failure data;log-linear ROCOF;Weibull ROCOF;optimal replacement time; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.40, no.1, 2007³â, pp.39-50
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200708506339431)
¾ð¾î : Çѱ¹¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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