Publications by authors named "S Umezu"
Article Synopsis
- The text discusses a new method called periodic split attractor reconstruction (PSAR) designed to enhance the evaluation of electrocardiograms (ECGs) for better diagnosis of cardiovascular diseases (CVDs) and health monitoring.
- PSAR analyzes ECG signals by splitting them based on the cardiac activity cycle, utilizing three different splitting techniques to capture their chaotic behavior.
- The method was tested using a combined dataset of CVDs and ECG signals from obstructive sleep apnea syndrome (OSAS), demonstrating varying degrees of sensitivity for different CVDs and effectively identifying sleep abnormalities in OSAS cases.
Heart disease-related deaths have increased in recent decades, with most patients dying of sudden cardiac arrest. In such instances, the effect of regular electrocardiogram (ECG) measurements is minimal. Therefore, long-term ECG monitoring has become increasingly important.
View Article and Find Full Text PDFQuartz crystal microbalance (QCM) is a versatile sensing platform that has gained increasing attention for its use in bioapplications due to its high sensitivity, real-time measurement capabilities, and label-free detection. This article presents a portable QCM system for liquid biosensing that uses a modified Hartley oscillator to drive 14 mm-diameter commercial QCM sensors. The system is designed to be low-cost, easy to use, and highly sensitive, making it ideal for various bioapplications.
View Article and Find Full Text PDFMicroengines driven by catalytic decomposition of a fuel have been an interesting research area recently due to their diverse applications, such as environmental monitoring and drug delivery. Literature reports a number of studies on this topic where researchers have made various attempts to manufacture such microengines. Some such methods are deposition of catalytic metal layers on sacrificial photoresists, electrochemical deposition of metal layers on polymeric structures, or 3D printing of structures followed by multi-step loading of structures with catalysts.
View Article and Find Full Text PDFArticle Synopsis
- This study compared the effects of two diabetes medications: mitiglinide/voglibose and glimepiride, on blood sugar levels and blood vessel health in type 2 diabetes patients.
- It was conducted as a multicenter, open-label, randomized crossover trial involving 30 hospitalized patients, measuring outcomes like blood glucose variability and vascular function over a 5-day treatment period for each drug.
- Results showed that while both medications had similar effects on vascular function, mitiglinide/voglibose significantly reduced blood sugar fluctuations and time spent in extreme glucose ranges compared to glimepiride.