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To evaluate the influence of voltage sag on electric-equipment and guide the design of compensation scheme for voltage sag, we need to evaluate the severity of effect of voltage sag on loads. This paper analyses the agglomeration effects of multiple voltage sag on the time scale. For irregular multiple voltage sag, this paper converts its voltage time-series curve into voltage duration curve, and...
Conventional ring amplifier suffers from stability problem, the problem is exacerbated when process, voltage and temperature (PVT) variations are taken into considerations. Prior works are mainly focused on stability problem, the influence of PVT on transient response were barely discussed. In this paper the influence of process variations on stability and transient response is analyzed, a process-...
In this paper, a high speed digital excess loop delay (ELD) compensation scheme with hybrid thermometer coding is proposed. In this high speed compensation, the time constraint of the DAC feedback route is shifted to the one clock compensation path. Also, the method to deal with the signal overflows the quantizer's range is analyzed. Compared to other digital ELD compensations, this scheme features...
Existing access control strategies for Internet of Things cannot provide good flexibility, robustness or quick response. We propose an access control approach of finer granularity and techniques supporting bulk operation to make interaction in IoT more flexible. Also, a decentralized strategy and data centric network techniques are used to enhance the system robustness and swiftness. We implement...
Edge devices (e.g., smartphones, tablets, connected vehicles, IoT nodes) with sensing, storage and communication resources are increasingly penetrating our environments. Many novel applications can be created when nearby peer edge devices share data. Caching can greatly improve the data availability, retrieval robustness and latency. In this paper, we study the unique issue of caching fairness in...
The proliferation and daily congregation of modern mobile devices have created abundant opportunities for peer edge devices to share valuable data with each other. The short contact durations, relatively small sharing sizes, and uncertain data availability, demand agile, light weight peer based data sharing. In this paper, we propose Peer Data Sharing (PDS) that enables edge devices to discover which...
The rapid penetration of mobile devices has provided ample opportunities for mobile devices to exchange sensing data on a peer basis without any centralized backend. In this paper, we design a peer based data exchanging model, where relay nodes move to certain locations to connect data providers and consumers to facilitate data delivery. Both relays and data providers can gain rewards from consumers...
Lacking of floor plans is a fundamental obstacle to ubiquitous indoor location-based services. Recent work have made significant progress to accuracy, but they largely rely on slow crowdsensing that may take weeks or even months to collect enough data. In this paper, we propose Knitter that can generate accurate floor maps by a single random user's one hour data collection efforts. Knitter extracts...
This paper presents an 11bit 200MS/s SAR-assisted pipeline ADC with a 2.5bit front end stage and two time-interleaved 9bit sub-SAR ADCs, implemented in 65nm CMOS process. The bias-enhanced ring amplifier works as the residue amplifier for power efficiency and large signal swing. Two self-biased inverter stages are designed in the ring amplifier to maintain the closed loop stability. The SAR ADCs with...
The proliferation and daily congregation of modern mobile devices have created abundant opportunities for peer edge devices to share valuable data with each other. The short contact durations, relatively small sharing sizes, and uncertain data availability, demand agile, light weight peer based data sharing. In this paper, we propose Peer Data Sharing (PDS) that enables edge devices to discover which...
The lack of digital floor plans in most buildings has become a huge obstacle to pervasive indoor location based services (LBS). Recently there has been quite some research that leverages various sensing data such as inertial, WiFi and images from ubiquitous mobile devices (e.g., smartphones) to construct floor plans at large scale and low costs. Although great efforts are made to improve the accuracy...
We report on the first demonstration of electrothermally tunable graphene nanoelectromechanical resonators via Joule heating. We fabricate single-, bi- and tri-layer graphene resonators (up to 136MHz) to study electrothermal effects on resonance characteristics. The tri-layer graphene resonator exhibits frequency upshift from 9.5MHz to 26.1MHz by electrothermal heating, resulting in tuning range up...
We have designed an implantable integrated photonic probe that produces a plane of illumination. The planar illumination pattern is produced using aluminum nitride waveguide gratings and microlenses compatible with light sheet microscopy within scattering tissue.
As air pollution is becoming a serious problem in developing nations, governments try to track and solve this problem by monitoring air pollution. With the proliferation of smartphones, mobile crowdsensing becomes a promising paradigm for monitoring fine-grained air pollution in urban areas. As existing studies have shown that pollutant concentrations have inherent spatiotemporal correlations, compressive...
Despite significant research efforts and great advances on Mobile CrowdSensing (MCS), building MCS applications remains difficult. In this paper, we develop and run Dining Halls on Live (DHOL), a campus dining population density monitoring system over several months. We make a holistic reality examination, discover key technical and practical difficulties, develop effective solutions and share our...
Since GPS signal is not applicable indoors, vehicle tracking has proven a hassle in underground parking structures. Recent solutions highly rely on floor map to constraint inertial sensors noises. In this paper, we propose VeMap, a road map construction system using only smartphones inside vehicles. It saves effort-intensive and time-consuming business negotiations with building operators, and expensive...
This paper presents a digital encoding way to optimize the property of a 6-bit 1.33-GS/s folding and interpolating ADC. Instead of the conventional digital encoding way, i.e. zero-crossing point searching, an adder-coding scheme is used to transfer the cyclic thermometer code into binary code, which eliminates the missing code and elevates the ENOB of the FI ADC from 3.80 bits to 5.02 bits at the...
The input buffer applied in the analog-to-digital converter (ADC) is to isolate the connection between the input signal and the sampling switch. In time-interleaved ADC structure for achieving high speed and high resolution, the distortion introduced by sampling circuit of sub-ADC channels affects the linearity of the input signal. A wide-band input buffer is proposed in this paper with 1.5GHz band-with...
A low-Power Programming Gain Amplifier (PGA) with DC-Offset Cancellation for long term evolution (LTE) is implemented in a 65-nm CMOS. The proposed PGA is composed of a three-stage sub-VGA with DC-offset cancellations (DCOC) and common-mode feedbacks (CMFB). The gain of the proposed PGA ranges from 0 dB to 42 dB with a step of 3 dB, which can be easily tuned by switched-resistors and switched-capacities...
With the development of renewable energy generators and electricity storages, microgrids become a promising technology of the smart grid. Maximizing the usage of renewable energy is vital to running a microgrid as it indicates reduction of the usage of thermal electricity purchased from the macrogrid. To this end, the excessive renewable energy of a user should be transferred to other users who need...
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