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This paper addresses the autonomous flight control system of an unmanned helicopter. We adopt a model-free discrete linear quadratic tracking (LQT) control architecture based on reinforcement learning algorithm by rewriting the Q-learning approach. From input and output data, the linear quadratic optimal gain is directly found without system identification procedure. Least square method is adopted...
We describe tunable sensitivity and linearity of layer-by-layer (LbL) self-assembled single-walled carbon nanotube (SWCNT) thin-film composites as a pH sensor by means of silica nanoparticles (SNPs). The SWCNT thin-film devices without and with SNP layer were fabricated with LbL self-assembly and characterized electrochemically in pH buffers. The role of SNPs in SWCNT thin-film chemoresistors and...
We describe microfluidic channel assisted carbon nanotube (CNT) alignment followed by microfabrication and characterization of a suspended CNT thin film. The alignment of CNT is enhanced by heating the CNT dispersion, which is characterized with Raman spectroscopy yielding a high G- to D-band intensity ratio of 22 along the microfluidic flow direction. The sidewall of CNT film pattern, left in a lift-off...
An all single-walled carbon nanotube film was deposited through layer-by-layer self-assembly without use of a copolymer, resulting in 75% reduction of resistivity compared to previous composite films made with copolymer. The deposited film thickness could be well controlled by changing the number of dipping cycles. Moreover, a 3-terminal electromechanical switch built with this thin film behaved like...
In this paper, an H∞ robust control design technique is developed for unknown discrete linear time-invariant systems subject to a bounded time-varying disturbance. This technique essentially combines two typical procedures of system indentification and H∞ control design in literature. Once the given system is described as a discrete linear time-invariant system with plant uncertainty through the system...
Widely used protocols (UDP and TCP) are observed for variations of the UDP to TCP ratio and of port number distribution, both over time and between different networks. The purpose of the study was to understand the impact of application trends, especially the growth in media streaming, on traffic characteristics. The results showed substantial variability but little sign of a systematic trend over...
On-chip clock networks are remarkable in their impact on the performance and power of synchronous circuits, in their susceptibility to adverse effects of semiconductor technology scaling, as well as in their strong potential for improvement through better CAD algorithms and tools. Our work offers new algorithms and a methodology for SPICE-accurate optimization of clock networks, coordinated to satisfy...
This paper proposes a measurement metric to observe and analyze traffic variations at the higher abstraction level, i.e., IP host and its interactions. Each interaction is extracted for three common attributes: number of flows, size in bytes and lifetime. Applying the coefficient of variation metric for the interactions (flow, size, lifetime) of each host, our analysis shows that although many hosts...
A low-cost, flexible, and disposable immunosensor is presented in this paper. The single-walled carbon nanotubes (SWNT) and biomolecules are self-assembled on micro patterned electrodes. The immuno-chip acts as the platform of a horseradish peroxidase (HRP) labeled sandwiched Enzyme-Linked Immunosorbent Assay (ELISA). The pH change induced by the biochemical reactions influences the electrical conductance...
In modern passive network measurement, flow-based analyses have been widely used. In this paper, we regard dasiahostspsila as aggregations of flows, and investigate host rather than flow-based measurements. We show that analyzing host behaviors contribute significantly to better understanding of network behavior, thus it is a feasible study that should be of interest to both researchers and network...
Much work has been done on observing and determining application types for network traffic flows. This is non-trivial because newer applications often encrypt their packets and do not use default port numbers. Also, application updates or protocol changes could vary the distributions of flow behaviors and patterns, resulting in complicated identification methods. We propose a different approach, in...
In this paper, a CMOS analog-to-digital converter (ADC) with an 8-bit 500 MSPS at 1.8 V is designed. The architecture of the proposed ADC is based on a Folding ADC with a cascaded-folding and a cascaded-interpolation structure. A self-linearized preamplifier with source degeneration technique and a folder averaging technique for the high-performance are introduced. Further, a novel auto-switching...
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