Smart Sensors at the IoT Frontier - Introduction.- Part I: Device technology for IoT.- Chapter1. Energy-Autonomous Supply-Sensing Biosensor Platform Using CMOS Electronics and Biofuel Cells.- Chapter2. Smart Microfluidic Biochips.- Chapter3. Reducing Timing Discrepancy for Energy-Efficient On-Chip Memory Architectures at Low-Voltage Mode.- Chapter4. Redesigning Software and Systems for Non-volatile Processors on Self-powered Devices.- Part II: Sensing technology for IoT.- Chapter5. OEICs for High Speed Data Links and Tympanic Membrane Transducer of Hearing-Aid Device.- Chapter6. Depth estimation using single camera with dual apertures.- Chapter7. Scintillator-based Electronic Personal Dosimeter for Mobile Application.- Part III System and application.- Chapter8. LED Spectrophotometry and Its Performance Enhancement based on Pseudo BJT.- Chapter9. An air quality and event detection system with life logging for monitoring household environments.- Chapter10. Mobile Crowdsensing to Collect Road Conditions and Events.- Chapter11. Sensing and Visualization in Agriculture with Affordable Smart Devices.- Chapter12. Learning Analytics for e-Book-Based Educational Big Data in Higher Education.- Chapter13. Security and Privacy in IoT Era.