Complementary metal-oxide-semiconductor (CMOS)-compatible Ar+-implanted Si-waveguide p-i-n photodetectors operating in the mid-infrared (2.2 to 2.3 μm wavelengths) are demonstrated at room temperature. Responsivities exceeding 21 mA/W are measured at a 5 V reverse bias with an estimated internal quantum efficiency of 3.1%–3.7%. The dark current is found to vary from a few nanoamps down to less ...

This paper presents a power supply module targeted for low-power applications in the sub-mW range incorporating a passive μDMFC fuel cell (μFC) acting as energy source and a customized boost converter for the energy conversion. The low power budget of such energy sources mandates the adoption of efficient circuit solutions, hence the design of the boost converter is challenging. To maximize the...

Based on the observation that application phases exhibit varying degrees of sensitivity to noise (i.e., accuracy loss) in computation during execution, this paper explores how Dynamic Precision Scaling (DPS) can maximize power efficiency by tailoring the precision of computation adaptively to temporal changes in algorithmic noise tolerance. DPS can decrease the arithmetic precision of noise-tol...

Security managers face the challenge of formulating and implementing policies that deliver their desired system security postures — for example, their preferred balance of confidentiality, integrity, and availability — within budget (monetary and otherwise). In this paper, we describe a security modelling methodology, grounded in rigorous mathematical systems modelling and economics, that captu...

We present a method to perform accurate measurements in the UHF (ultra high frequency) band on passive RFID (radio frequency identification) transponder chips. Our samples were extracted from commercially available RFID tag inlays. We determine the minimum operating power necessary to get a response from the transponder chip. Furthermore, we measure the chip input impedance in both, the reflect...

In this paper, we study a budget constrained location problem in which we simultaneously consider opening some new facilities and closing some existing facilities. Motivations for this problem stem from applications where, due to a change in the distribution of customer demand, the existing facility system no longer provides adequate service. The objective is to minimize the total weighted trav...

MWR The mission The Microwave Radiometer (MWR) is a twochannel passive radiometer operating at 23.8 and 36.5 GHz based on the Dicke principle. By receiving and analysing the Earth-generated and Earth-reflected radiation at these two frequencies, the instrument will measure the amount of water vapour and liquid water in the atmosphere, within a 20 km-diameter field of view immediately beneath En...

The USNO 8–inch astrograph has been equipped with a Kodak 1536x1024 pixel CCD since June 1995, operating in a 570–650 nm bandpass. With 3–minute exposures well exposed images are obtained in the magnitude range R ≈ 8.5 − 13.5. An astrometric precision of 10 to 15 mas for those stars is estimated from frame–to–frame comparisons. External comparisons reveal an accuracy of about 15 mas for those s...

Security managers face the challenge of formulating and implementing policies that deliver their desired system security postures — for example, their preferred balance of confidentiality, integrity, and availability — within budget (monetary and otherwise). In this paper, we describe a security modelling methodology, grounded in rigorous mathematical systems modelling and economics, that captu...

A method for efficiently selecting the operating modes within a block-based multi-mode video compression system is described. For a given image region, the optimum combination of modes is selected so as to minimize the overall distortion for a given bit-rate budget. Necessary conditions for optimizing the encoder operation are derived within a rateconstrained product code framework [I]. When ra...