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In sub 10-nm technology nodes, the directed self-assembly technology with multiple patterning lithography (DSA-MP) is a promising solution for contact/via layer fabrication. However, previous studies using multiple patterning with a single block copolymer (BCP) material still suffer from low via manufacturability due to limited types of feasible guiding templates. To mitigate the problem, multiple...
We show that single-photon-triggered vortex (or anti-vortex) crossing in a superconducting nanowire single-photon detector induces timing jitter, which fundamentally limits the time-resolving capability of the detector.
This work presents research results on designing the drive and readout circuits for a newly-developed optical vibrations sensor. Tes sensor consists of organic light-emitting diodes (OLEDs) and photodetectors (OPDs) and micro-structure to realize the function of vibration sensing. Proper operations of OLEDs and OPDS needs a driver and a readout circuit, respectively. A driver circuit is designed for...
Facial wearable items recognition refers to the judgment of whether the face in a face image wears a facial item, such as an eyeglass or a mask, which belongs to the category of face attribute analysis. In recent years, face attribute analysis mainly focuses on the study of gender, age, expression and other aspects, ignoring the study of facial wearable items recognition. However, this technology...
Combining the current development of high-gain antenna technology, the inter-satellite terahertz communication system's demand for acquisition pointing and tracking (Acquisition Pointing Tracking, APT) technology are analyzed based on the inter-satellite terahertz communication application. The tracking-pointing error has a major influence on the received power of the communication system by simulating...
In this work, a NIR (near infrared ray) based fast pupil ellipse fitting based gaze tracking system is developed for the wearable eye tracker. By a near-field and side-view eye camera, the contour of pupil in captured images is an ellipse generally, and that of pupil shape is not always circular. After pre-processing, the pupil contour is recognized by the two-stage binarizations, and the binaried...
Traffic accident detection is an important component in Intelligent Transportation System (ITS). Compared with freeway, urban accident detection is more complicated. The mean reason is that there are full of flow-disruptive entities (traffic signals, intersections and bus stops) in urban roads, which can disrupt the traffic flow in a similar way that an accident occurs. In this paper, an effective...
In this paper, wavelength division multiplexing and space division multiplexing (WDM-SDM) passive optical access network employing multi-core fiber (MCF) and self-homodyne detection is proposed. 4×56-Gb/s PDM-16QAM-OFDM transmission is realized over 10-km 7-core fiber with simplified digital signal processing.
In this paper, a 60cm free-space optical card-to-card wavelength division multiplexing (WDM) transmission architecture using OFDM modulation and coherent detection is proposed and demonstrated, which can offer flexibility and high speed transmission simultaneously. The experimental results show that the net data rate is up to 106.9Gb/s and the receiver sensitivity is −34dBm at the BER threshold of...
We compared the performance of the asymmetric and direct current bias limiting optical orthogonal frequency division multiplexing (ADO-OFDM), asymmetric limiting optical orthogonal frequency division multiplexing (ACO-OFDM), and the direct current bias limiting optical orthogonal frequency division multiplexing (DCO-OFDM) in visible light communication (VLC) systems. We optimize the power ratio between...
A high-performance hybrid multiplexer for wavelength division multiplexing (WDM) and polarization-division multiplexing (PDM) is proposed and realized by combining a polarization-splitter-rotator (PSR) and a microring resonator (MRR) array. A 16-channel hybrid multiplexer with eight wavelength-channels and dual polarizations is demonstrated as an example. Any MRR works bi-directionally and provides...
We investigate and analyze the asymmetrically clipped and direct-current-biased optical orthogonal frequency division multiplexing (ADO-OFDM) in visible light communication (VLC) system. Then we propose two modified channel equalization algorithms of ADO-OFDM in VLC systems. It is shown that the algorithm combined with channel estimation for interference cancellation to recover ADO-OFDM signal is...
One of the main challenges of Healthcare services is to find a suitable way of managing limited resources within a highly demanding environment. This challenge can now be tackled by deploying reliable software systems that are supported by Software Engineering practices. In this paper, we present a Model Driven Engineering (MDE) approach that, by way of an example, is applied to an Accident and Emergency...
A distributed temperature sensor (DTS) utilizing two mode fibers as the sensing fiber is proposed and experimentally demonstrated for long range temperature measurement. Compared with the few mode fiber (FMF) based DTS reported previously, the temperature resolution has been improved to be 1.7 °C at 10 km and 6.0 °C at 20 km, respectively.
We demonstrate a few mode fiber based Raman distributed temperature sensor with wavelet-denoising technique and optimized sensing link. Temperature sensing over 25 km with 3m/7.5 °C spatial /temperature resolution is achieved.
One of the challenges for using metamodels in Model Driven Engineering is to automatically generate metamodel instances. Each instance should satisfy many constraints defined by a metamodel. Such instances can then be used for verifying or validating metamodels. Recent studies have already shown that this can be tackled by using SAT/SMT solvers. However, such instance generation does not take coverage...
5G and Internet of things (IOT) develop rapidly, but the major applications of IOT-wireless sensor networks(WSNs) have numerous data, resulting in serious transmission load. In order to reduce the number of transmitted packets, this paper focuses on data aggregation for WSNs and proposes a novel event-based data aggregation mechanism using both principle component analysis(PCA) and support vector...
As the transformer oil could be replaced regularly, the service life of the transformer is deeply affected by the reliability of the transformer winding insulation. Continuously Transposed Conductor (CTC) is widely used in high voltage level transformer, but there are few of studies on the V-N characteristic of continuously transposed conductor, especially for the aging winding. In this paper, the...
In orthogonal frequency division multiplexing (OFDM) systems, a number of OFDM symbols form one subframe and consecutive subframes may be allocated to different users. Automatic gain control (AGC) is commonly employed in OFDM systems because the power of receiving signals can vary over a large dynamic range. After measuring the power of cyclic prefix (CP) of the first OFDM symbol in a subframe, AGC...
This paper reports a novel electrochemical glucose sensor fabricated on the flexible cylindrical substrate with bigger working electrode surface by the rotated inkjet printing method to overcome the challenge of hypoglycemia detection in clinics. The rotated inkjet printing technique enables directly patterning microstructures on cylindrical surface which overcomes the limit of the traditional planar...
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