1 INTRODUCTION 1 2 METHODS AND MATERIALS 5 2.1 Development of a UFM Sensor Module 5 2.2 Experimental Setup 6 2.3 Descriptions of the Proposed Xero Algorithm 8 2.4 Experimental Procedures 13 3 RESULTS 15 3.1 Flowrate Estimation 15 3.2 Robustness According to the Fluid Temperature 16 3.3 Accuracy via Number of Cycles 19 3.4 Continuous Monitoring Performance of the UFM System 21 4 DISCUSSION 23 5 CONCLUSIONS 27 Bibliography 30 국문초록 34