Heterostructures based on layering of two-dimensional (2D) materials such as graphene and hexagonal boron nitride represent a new class electronic devices. Realizing this potential, however, depends critically the ability to make high-quality electrical contact. Here, we report contact geometry in which metalize only 1D edge 2D layer. In addition outperforming conventional surface contacts, edge-contact allows complete separation layer assembly metallization processes. heterostructures,...

Currently, more and 360-degree videos (or 360 for short) are being provided via the Internet. This kind of can render a virtual reality (VR) environment head-mounted display (HMD). However, understanding quality experience (QoE) is big challenge because user in VR very complex phenomenon. In this paper, QoE considered terms four aspects, namely perceptual quality, presence, acceptability, cybersickness. Subjective tests designed to investigate influences important factors including encoding...

In this paper, we propose a new adaptation approach for viewport-adaptive streaming of 360-degree videos over the Internet. The proposed is able to systematically decide versions tiles according user head movements and network conditions by taking into account not only viewport estimation errors, but also users in each segment duration. experimental results show that can effectively adapt both varying user's movements. Compared existing approaches, improve average quality up 3.8 dB reduce...

360 videos are becoming more and popular on video streaming platforms. However, a good quality metric for is still an open issue. In this work, we investigate both objective subjective metrics videos. The goals to understand the perceived range provided by existing mobile and, especially, identify appropriate communications. To that end, test conducted in study. Then, relationship between investigated. Especially, ten measures computed, considering coding distortion measurement, cross-format...

In this study, we present a novel approach to prepare of colorimetric chemical sensor for H2O2 and glucose biosensor basing on the use peroxidase-like activity silver nanoparticles decorated reduced graphene oxide sheets ([email protected]) nanocomposite. Herein, [email protected] nanocomposite was synthesized by one-step hydrothermal reducing method its physico-chemical properties were characterized X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), Ultraviolet–visible...

In the context of HTTP Adaptive Streaming (HAS), a main challenge is how to evaluate quality experience (QoE) session. general, QoE streaming session affected by three key factors, namely initial delay, varying perceptual quality, and interruptions. this paper, in order investigate impacts variations interruptions on session, we propose use histograms, which represent frequency distributions these recurrent factors The modeled pooling statistics delay. Evaluation results show that proposed...

Three hundred and sixty degree video is becoming more popular on the Internet. By using a Head-Mounted Display, 360-degree can render Virtual Reality (VR) environment. However, it still big challenge to understand Quality of Experience (QoE) since user experience during watching very complex phenomenon. In this paper, we aim investigate four QoE aspects video, namely, perceptual quality, presence, cybersickness, acceptability. addition, key QoE-affecting factors encoding parameters, content...

360 videos have recently become a popular virtual reality content type. However, good quality metric for is still an open issue. In this work, our goal to identify appropriate objective metrics video communications. Especially, fourteen measures at different processing phases are considered. Also, subjective test conducted in study. The relationship between and investigated. It found that most of the PSNR-related well correlated with quality. evaluating across contents, content-based needed.

HTTP Adaptive Streaming (HAS) has become a popular trend for multimedia delivery nowadays. Because of throughput variations, video quality strongly fluctuates during session. Therefore, main challenge in HAS is how to evaluate the overall In this paper, we explore impact variations on perceptual HAS. We propose use histogram segment values and gradients session model quality. Subjective test results show that proposed can capture accurately predict

360-degree video has become increasingly popular nowadays. For effective transmission of bandwidth-intensive over networks, viewport-adaptive streaming been introduced. In this article, we evaluate, for the first time, ten existing methods to understand effectiveness tile-based viewport adaptive video. Experimental results show that can improve average V-PSNR by up 4.3 dB compared a non-tiled method under low delay settings. Here, is computed as peak signal-to-noise ratio adapted...

A portable and simple Raman scattering photoluminescence spectroscopy system was set up for sensitive rapid determination of nitrate/nitrite at low concentrations in water samples. The SERS (Surface Enhanced Scattering) – active Ag/ITO substrates were prepared employed to obtain the enhanced light from sample. Concentrations as 1 ppm 0.1 detectable nitrate nitrite, respectively. obtained results confirmed usefulness designed actual environmental measurements analysis.

In this paper, we propose a new adaptation approach for viewport-adaptive streaming of 360-degree videos over the Internet. The proposed is able to systematically decide quality levels tiles according user head movements and network conditions by taking into account not only prediction errors but also in each interval. Experimental results show that can effectively adapt both varying movements. Compared existing approaches, improve average viewport up 3.9dB reduce standard deviation 50%.

HTTP Adaptive Streaming has become a popular solution for multimedia delivery nowadays. However, due to network bandwidth fluctuations, video quality strongly varies during streaming. Therefore, key challenge in is how evaluate the overall of streaming session. In this article, machine learning approach proposed prediction, where each segment session represented by set features. Two options feature are investigated. first option, we use four features, namely quality, content characteristics,...

Internet of Things (IoT) and Virtual/Augmented Reality (VR/AR) are shaping our future by merging the digital physical words. In this trend, 360-degree video which is a key component VR/AR becoming increasingly popular nowadays. For effective transmission bandwidth-intensive videos over network, viewport-adaptive streaming has been introduced. paper, we study impact response delay on videos. Specifically, focus two components 1) adaptation interval 2) client buffering delay. Experiment...

As device geometry shrinks to 0.35 μm and below, the parasitic capacitance between closely spaced metal lines becomes important in terms of resistance‐capacitance time delay switching. In this study, we investigated use fluorine doped plasma enhanced chemical vapor deposition grown silicon oxide thin film as a low dielectric constant intermetal material. We evaluated an organometallic liquid source triethoxyfluorosilane F dopant. It was found that generally decreased concentration increased....

HTTP Adaptive Streaming (HAS) has become a popular solution for multimedia delivery nowadays. Because of throughput variations, video quality fluctuates during streaming session. Therefore, main challenge in HAS is how to evaluate the overall In this paper, we explore impacts values and variations HAS. We propose use histogram segment gradients session model quality. Subjective test results show that proposed very high prediction performance different videos. Especially, provides insights...

Image quality assessment (IQA) has been a popular research topic in image processing. However, most studies until now have focusing on traditional images and only few focused omnidirectional images. Unlike the case of images, users can view part 360-degree at time, thus tend to focus more specific regions image. This makes predicting scores for challenging task since existing models usually treat all equally. In this paper, we propose an model based deep learning. focuses learning features...

The quality of adaptive streaming may fluctuate strongly during a session. Therefore, challenge is how to evaluate the session over time. In this study, cumulative model proposed for HTTP streaming. based on concept sliding window video segments It found that minimum quality, last and average are key components model. addition, applicable real-time monitoring, which especially important cost-effective evaluation technologies as basis mechanisms.

Virtual Reality (VR), which brings immersive experiences to viewers, has been gaining popularity in recent years. A key feature VR systems is the use of omnidirectional content, provides 360-degree views scenes. In this work, we study human quality perception images, focusing on different zones surrounding foveation point. For that purpose, an extensive subjective experiment carried out assess perceptual images with non-uniform quality. Through experimental results, impacts are analyzed....

In this paper, we present a QoS-adaptive framework for screen sharing over heterogeneous networks. Basic requirements and important issues of system are described. For determining optimal video coding parameters, adaptation trajectory is used as the hints in making decisions. Further, experiments carried out to investigate trade-off between bitrate buffering delay time-varying

A key component in VR systems is omnidirectional content, which provides 360-degree views of scenes. At a given time, only portion called viewport, displayed using head-mounted displays. In this work, we develop an objective quality metric, Weighted Viewport PSNR (W-VPSNR), for content spatially-varying quality. Through experiment results, it found that the W-VPSNR metric well correlates with subjective scores.