CSE Doctoral Student Seminar: Mingquan Yuan and Liang Zhou

Sep 22, 2017
12:30 p.m.
2 p.m.
Lopata Hall, Room 101

"Self-assembling Quick Response Codes for Self-powered Biosensing"

Mingquan Yuan
Adviser: Shantanu Chakrabartty

The last decade has seen significant proliferation of smartphones into the consumer market and across different parts of the world. Not only do these mobile devices provide wireless connectivity in remote locations, they are also equipped with different optical and acoustic sensing capabilities as well. For instance smart-phones can scan quick-response (QR) codes that encode the location of a web-server from which the product specific information (e.g. active ingredients, side effects and consumer ratings) could be retrieved. However, if the information encoded by a QR code could also reflect the concentration levels of target analytes in a product, then by using a smart-phone the consumer could determine the freshness of a perishable product, like milk. The QR code also provides a platform to integrate the concept of forward error-correcting biosensors where the process of biosensing could be combined with error-correcting codes to achieve a higher reliability and throughput in analyte detection. In this talk I will discuss challenges in designing a self-powered QR-code biosensor that can be integrated with food-package and can be interrogated using a smart-phone. I will present an overview of a self-assembly technique used to construct a valid QR code in the presence of target analytes and I will also highlight the challenges in integrating paper-based microfluidics for sample acquisition and processing.

"Robust Self-powered Time-keeping for Passive Device Authentication"

Liang Zhou
Adviser: Shantanu Chakrabartty

A major limitation in authenticating passive and IoT devices such as RFID sensors, tags or untethered assets like SMDs is that these devices do not have access to a continuously running system clock. This obviates the use of dynamic SecureID type authentication techniques involving random keys and tokens that need to be periodically generated and synchronized. While self-powered timer device based on FowlerNordheim Tunneling has been shown to be robust to fabrication mismatch and temperature variations, authentication using a single timer is still prone to process failure. In this paper we propose a random sampling approach using an ensemble of timers to achieve a more reliable synchronization and hence authentication approach. Measured results from a 4x4 timer array prototype fabricated in a 0.5 um CMOS process demonstrate that while the individual responses of the timers might be different from each other, the proposed ensemble approach is more robust across different timer clusters. The improved performance obtained using the ensemble timer approach makes it suitable for long-term dynamic authentication of passive IoT devices. Dynamic authentication protocol based on the proposed timer device can overcome the security flaws of existing protocols for passive devices.