Sumit Dutta

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A s databases grow more prevalent and comprehensive, database administrators seek to limit disclosure of confidential information while still providing access to data. Practical databases accommodate users with heterogeneous needs for access. Each class of data user is accorded access to only certain views. Other views are considered confidential , and(More)
—A lightweight Web Service and a Web site interface have been developed, which enable remote measurements of electronic devices as a " virtual laboratory " for undergraduate engineering classes. Using standard browsers without additional plugins (such as Internet Explorer, Firefox, or even Safari on an iPhone), remote users can control a Keithley(More)
We describe a pulsed measurement technique for suppressing hysteresis for carbon nanotube (CNT) device measurements in air, vacuum, and over a wide temperature range (80-453 K). Varying the gate pulse width and duty cycle probes the relaxation times associated with charge trapping near the CNT, found to be up to the 0.1-10 s range. Longer off times between(More)
Phase change memory (PCM) is a promising candidate for the next-generation non-volatile data storage, though its high programming current has been a major concern. By utilizing carbon nanotubes (CNTs) as interconnects to induce phase change in ultra small regions of Ge 2 Sb 2 Te 5 (GST), we are able to lower the programming current to less than 10 μA,(More)
Digital circuits made with nano-electro-mechanical (NEM) relays offer energy-efficiency benefits over CMOS since they have zero leakage power and can offer circuit level performance that competes with CMOS. In this paper we show how new relay circuit design techniques combined with those we already demonstrated on smaller relay blocks enable us to optimize(More)
Nano-electromechanical (NEM) relays are an alternative to CMOS transistors as the fabric of digital circuits. Circuits with NEM relays offer energy-efficiency benefits over CMOS since they have zero leakage power and are strategically designed to maintain throughput that is competitive with CMOS despite their slow actuation times. The floating-point unit(More)
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