CNN based real-time object detection can facilitate various AI applications that need to understand the surroundings via camera, such as autonomous package delivery robots, augmented reality, and intelligent drone applications. Currently, due high computation cost of CNN, accurate is only possible when mobile devices upload video frames powerful edge servers through high-speed wireless networks like WiFi. However, for many open-air applications, network conditions (such cellular networks)...

We present the fabrication and characterization of a novel uncooled infrared sensor for room-temperature imaging. The sensitive element is freestanding amorphous silicon thin film transistor (a-Si TFT) with temperature coefficient drain current (TCC) 0.015–0.08/K. TCC value to ambient can be controlled by gate voltage a-Si TFT. complete procedures based on porous micromachining technique fabricating thermally isolated air bridges are described. isolation structures have thermal conductance...

Smartphone localization is essential to a wide spectrum of applications in the era mobile computing. The ubiquity smartphone cameras and surveillance ambient holds promise for offering sub-meter accuracy services thanks maturity computer vision techniques. In general, ambient-camera-based solutions are able localize pedestrians video frames at fine-grained, but tracking performance under dynamic environments remains unreliable. On contrary, mobile-camera-based capable continuously...

The cylinder-airfoil interaction noise can be reduced by changing the shape of leading edge downstream airfoil. Generally, this way not only reduce at middle and high frequency, but also change peak low frequency. This study attempts to affect from perspective reducing intensity upstream wake shedding vortex. In order achieve target, equally spaced grooves were cut into cylinder, acoustic wind tunnel tests various incoming velocities (20–60m·s −1 ) conducted compare (NACA0012) models. It is...

Most existing multi-user Augmented Reality (AR) systems only support multiple co-located users to view a common set of virtual objects but lack the ability enable each user directly interact with other appearing in his/her view. Such AR should be able detect human keypoints and estimate device poses (for identifying different users) meantime. However, due stringent low latency requirements intensive computation preceding two capabilities, previous research enables either capabilities for...

When the liquid rocket engine turbopump starts, tank valve opens first before pump is driven. Due to and hydrostatic pressure, there a passive flow phenomenon inside called natural flow. The impeller passively rotated by hydraulic impact, which impacts stability of during initial startup period. In order study unsteady characteristics turbopump, coupled CFD/6DOF solver used for simulation obtaining variation rotational speed, loss, torque with time.

This paper reports the theory, fabrication and testing of a novel single-chip uncooled infrared (IR) sensor using amorphous silicon thin film transistors (a-Si TFT) as active elements. The measured temperature coefficient channel current (TCC) TFT is about 6.5%/K at 300 K. A porous (PS) surface micromachining technique developed to fabricate thermal isolation structures. whole process compatible with standard IC process. In order eliminate self-heating effect element in focal plane array...

Pioneer research works for WiFi-based sensing usually depend on an extremely high sampling rate of over 1000 Hz to collect abundant number Channel State Information (CSI) measurements, which depict the environmental changes and human motions. However, these methodologies can be hardly deployed embedded platforms cannot directly commercialized. In this paper, we propose WiSafe, a real-time intrusion detection system that with relatively low 15--20 commercial devices. Both primitive physical...

Smartphone localization is essential to a wide spectrum of applications in the era mobile computing. The ubiquity smartphone cameras and surveillance ambient holds promise for offering sub-meter accuracy services thanks maturity computer vision techniques. In general, ambient-camera-based solutions are able localize pedestrians video frames at fine-grained, but tracking performance under dynamic environments remains unreliable. On contrary, mobile-camera-based capable continuously...

In the theory of spontaneous combustion, identifying critical value Frank- Kamenetskii parameter corresponds to solving a bifurcation point problem. There are two different numerical methods used solve this problem—the direct and indirect methods. The latter finds by partial differential equation (PDE) This is better method find for complex geometries. paper improves combining grid-domain extension with matrix computation method. We calculate parameters Frank-Kamenetskii some geometries...

A novel micromachined uncooled infrared (IR) detector based on hydrogened amorphous silicon (a-Si:H) thin film transistor (TFT) as thermosensitive element is proposed for the first time. It utilizes high temperature dependence of drain current induced by influences variation effective carrier mobility in channel and threshold voltage. An IR resonance cavity between absorber gate electrode improving absorptivity a microbridge providing low thermal conductance are designed. The differential...

Based on the ray-tracing model, a new method of achieving high gain and aperture efficiency Fabry-Perot antenna with metamaterial-based corner reflector is proposed. The proposed composed dual circularly polarized patch feed reflector. consists four phase correction metasurfaces partially reflective surface. First, theory analysis are presented. Then, performances feed, traditional antenna, compared among each other analyzed. Finally, fabricated measured. measured left-hand circular...

Power internet of things (PIoT) is essential for enhancing the resilience and adaptability power grid. Given broad electricity coverage, deployment PIoT devices to remote areas inevitable, which poses high challenge on devices' information acquisition, owing limited battery capacity coverage BS. Therefore, a coverages coordinated multi-UAV trajectory optimization paradigm constructed in this paper, where UAVs BSs are supply comprehensive efficient sensing services devices. An adjacency...

As the key component of solid rocket engine, tailpipe nozzle's performance impacts on motion torque or force a lot. The servo system is undoubtedly determining factor adjusting quality nozzle. In order to guarantee high precision and great efficiency, electro-hydraulic good choice. For simple reason that output just one actuator in not enough for heavy load, synchronous control at least two actuators adopted. An with cylinders designed this paper. detailed design introduced beginning. And...

Mobile multiplayer augmented reality(AR) emerges in various applications including games, education, training, etc. Edge computing technique enables real-time environmental perception ability(e.g. object detection and segmentation) of devices by offloading complex computation to the nearby edge server. However, with more players involved video streams, bandwidth competition intensifies lengthens transmission latency, which severely impairs accuracy AR applications. We realize staggering...

The extreme loads experienced by the wind turbine in events are critical for evaluation of structural reliability. Hence, load alleviation control methods need to be designed and deployed reduce adverse effects events. This work demonstrates that highly correlated conditions such as turbulence-induced shears. Based on this insight, proposes a turbulence-based strategy adapting controller changes condition. estimation rotor averaged shear based is illustrated, herein used statistically...