Byunghoo Jung

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Intensity-modulated radiation therapy (IMRT) requires precise delivery of the prescribed dose of radiation to the target and surrounding tissue. Irradiation of moving body anatomy is possible only if stable, accurate, and reliable information about the moving body structures are provided in real time. This paper presents a magnetic position tracking system(More)
Energy conservation is essential in wireless sensor networks (WSNs) because of limited energy in batteries. Collaborative beamforming uses multiple transmitters to form antenna arrays; the electromagnetic waves from these antenna arrays can create constructive interferences at the receiver and increase the transmission distance. Each transmitter can use(More)
This paper presents a low power impulse generator design for ultra-wideband (UWB) impulse radio (IR) applications. Simple digital delay elements and a NAND gate are used to generate short duration pulses. A varactor controls the pulse width of the generated signal. The low-end of the spectrum of the generated pulse is attenuated using an integrated(More)
A real-time, on-chip power sensor that estimates load currents and on-chip temperatures concurrently is presented. It occupies an area of 0.01mm<sup>2</sup> in 0.13&#x03BC;m CMOS technology. With a simplified 1-point calibration and a response time of 80ns, it shows improvements in input dynamic range by 10&#x00D7;, response time by 6&#x00D7; and(More)