- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 1st International Cognitive Cities Conference (IC3) - Okinawa, Japan (2018.8.7-2018.8.9)] 2018 1st International Cognitive Cities Conference (IC3) - Hand Gesture Recognition Using Color-Depth Association for Smart Home
摘要： This study we propose a robust hand gesture segmentation method which associates the depth and color information with online training. Different existing methods, when the hands close to the body part or in cluttered background, our system remains valid. In the proposed method, a judging procedure of the hand point is applied to obtain more accurate result. As Kinect sensor has relatively large errors in acquisition of depth data at the edge of the object, this will lead to the wrong results with the depth threshold in coarse segmentation step. To compare with the existing systems, the proposed method is the least restrictive one in practically.
关键词： online training,Kinect sensor,Depth,ellipse model,hand gesture segmentation
更新于2025-09-09 09:28:46
-
Enzyme Biosensing Based on Zinc Oxide Nanostructures as Active Surface
摘要： Ag/ZnO mesostructures deposited onto substrates different were analysed in order to use ZnO as bioactive surface. This paper presents the results obtained at the eNDE of strips gratings deposited on different substrates used as bioactive surface using the EM sensor with MM lens in order to improve the emphasizing of the evanescent waves appeared when the slits of MSG are filled with immobilized enzymes.
关键词： EM sensor,enzyme biosensing,bioactive surface,evanescent waves,ZnO nanostructures
更新于2025-09-09 09:28:46
-
[IEEE 2017 51st Asilomar Conference on Signals, Systems, and Computers - Pacific Grove, CA, USA (2017.10.29-2017.11.1)] 2017 51st Asilomar Conference on Signals, Systems, and Computers - Frequency invariant beamforming for arbitrary planar arrays
摘要： In this paper, we present the adaptation to the least-square solution for frequency invariant beamforming to arbitrary planar arrays. This formulation is easily steerable thanks to the decoupling of spatial and spectral constraints. This is achieved with a basis of spherical harmonics polynomials, which parametrize the array response in a term dependent on frequency and a term dependent on the array geometry. Furthermore, the parametrization of the array response Bessel functions decouples the frequency term, which becomes independent of the geometry of the planar array, and allows steering in azimuth and elevation independently. The planar array response is approximated using virtual sensor modeling, which transform any two dimensional planar array in a virtual linear sensors, where azimuth and elevation are separable and can be steered independently.
关键词： frequency invariant beamforming,virtual sensor modeling,planar arrays,spherical harmonics
更新于2025-09-09 09:28:46
-
[IEEE 2018 IEEE International Conference on Intelligent Transportation Systems (ITSC) - Maui, HI, USA (2018.11.4-2018.11.7)] 2018 21st International Conference on Intelligent Transportation Systems (ITSC) - An Efficient Multi-sensor Fusion Approach for Object Detection in Maritime Environments
摘要： Robust real-time object detection and tracking are challenging problems in autonomous transportation systems due to operation of algorithms in inherently uncertain and dynamic environments and rapid movement of objects. Therefore, tracking and detection algorithms must cooperate with each other to achieve smooth tracking of detected objects that later can be used by the navigation system. In this paper, we first present an efficient multi-sensor fusion approach based on the probabilistic data association method in order to achieve accurate object detection and tracking results. The proposed approach fuses the detection results obtained independently from four main sensors: radar, LiDAR, RGB camera and infrared camera. It generates object region proposals based on the fused detection result. Then, a Convolutional Neural Network (CNN) approach is used to identify the object categories within these regions. The CNN is trained on a real dataset from different ferry driving scenarios. The experimental results of tracking and classification on real datasets show that the proposed approach provides reliable object detection and classification results in maritime environments.
关键词： maritime environment,object detection,convolutional neural networks,region proposals,autonomous vessel,multi-sensor fusion
更新于2025-09-09 09:28:46
-
Multiple Fano Resonance Based Optical Refractive Index Sensor Composed Of Micro-Cavity and Micro-Structure
摘要： A multiple Fano resonance based optical refractive index sensor composed of micro-cavity and micro-structure is designed. The multiple Fano resonances, generated by the interference between the multiple resonant peaks produced by the micro-cavity and the continuous background produced by the micro-structure, can reach high sensitivity in refractive index measurement. Besides, the micro-cavity con?guration obviously reduces the energy loss, thus effectively increasing the ?gure of merit. Adjusted by the micro-cavity thickness and the micro-structure con?guration, multiple Fano resonances can be generated potential for refractive index sensing: the sensitivity of 831 nm/RIU and the ?gure of merit of ～600 can be reached according to a single Fano resonance; moreover, spectral interval between double Fano resonances can also be used for refractive index sensing with the sensitivity of 194 nm/RIU but signi?cantly reducing the error due to the environmental changes. Considering the advantages as high sensitivity, narrow Fano resonant peak, high ?gure of merit and ease of integration, as well as its potential in environmental error reduction, the proposed multiple Fano resonance based optical refractive index sensor is expected to provide new tactics for optical refractive index sensing.
关键词： Refractive index sensor,micro-structures,micro-cavity,multiple Fano resonance
更新于2025-09-09 09:28:46
-
New bounds on dark matter coupling from a global network of optical atomic clocks
摘要： We report on the first Earth-scale quantum sensor network based on optical atomic clocks aimed at dark matter (DM) detection. Exploiting differences in the susceptibilities to the fine-structure constant of essential parts of an optical atomic clock, i.e., the cold atoms and the optical reference cavity, we can perform sensitive searches for DM signatures without the need for real-time comparisons of the clocks. We report a two orders of magnitude improvement in constraints on transient variations of the fine-structure constant, which considerably improves the detection limit for the standard model (SM)–DM coupling. We use Yb and Sr optical atomic clocks at four laboratories on three continents to search for both topological defect and massive scalar field candidates. No signal consistent with a DM coupling is identified, leading to considerably improved constraints on the DM-SM couplings.
关键词： massive scalar fields,quantum sensor network,dark matter,topological defects,optical atomic clocks,fine-structure constant
更新于2025-09-09 09:28:46
-
[IEEE 2018 International Semiconductor Conference (CAS) - Sinaia, Romania (2018.10.10-2018.10.12)] 2018 International Semiconductor Conference (CAS) - Numerical Simulations of Radiation Damage Effects in Active-Edge Silicon Pixel Sensors for High-Energy Physics Experiments
摘要： High-energy physics experiments at the future CERN High Luminosity LHC (Large Hadron Collider) require highly segmented pixelated sensors of increased geometrical efficiency and the ability of withstanding extremely high radiation damage. The performance of planar n-on-p sensors with active edges is simulated at very high fluences (2×1016 neq/cm2), using a recent three level trap model for p-type silicon material. Precise structural definition is achieved by investigating the doping pro(cid:191)le of the devices via the Secondary Ion Mass Spectrometry technique. The breakdown voltage, and hole density distribution are studied as a function of radiation fluences.
关键词： TCAD simulation,radiation damage,Active edge sensor
更新于2025-09-09 09:28:46
-
Optical Transition-Edge Sensors: Dependence of System Detection Efficiency on Wavelength
摘要： Optical transition-edge sensors (TESs) that can resolve the energy of a single photon have been proven useful in quantum information and biology. TESs can provide spectra ranging from near-infrared to visible regions and have the potential to reveal new phenomena in biology. In this paper, we have investigated the responses of TESs to photons at near-infrared and visible wavelengths, from 450 to 1000 nm in 10-nm increments using a supercontinuum laser and a tunable bandpass filter, which converted the multichromatic light source into monochromatic light. The system detection efficiency of an optical TES optimized for photon detection at 950 nm was nearly 100% at some wavelengths and was more than 10% for the overall bandwidth. We found that the detector responses strongly depended on the wavelengths. A spectrum of the filtered light at shorter wavelengths was more likely to show a second peak with energy lower than that of the primary peak.
关键词： system detection efficiency,Single-photon detection,superconducting detector,transition-edge sensor (TES),supercontinuum (SC) laser
更新于2025-09-09 09:28:46
-
Polymer Foam-Supported Chemically Reduced Graphene Oxide Conductive Networks for Gas Sensing
摘要： In this work, gas sensors based on chemically reduced graphene oxide (rGO) foams were reported for NH3 detection. Polymer foams were used as scaffolds to support rGO, and the resultant soft sensing devices exhibited a high sensitivity, high selectivity, and rapid recovery for NH3 detection at room temperature. The sensor showed more than 0.90% and 3.67% resistance changes respectively, when it’s exposed to 1 ppm and 50 ppm NH3. The graphene foam gas sensors (FGS) also showed excellent repeatability. Furthermore, the response of rGO foam gas sensor to NH3 was more than two times higher than that to methanol vapors diluted to 1% of the saturated vapor concentration. Above all, the unique features, such as simple preparation, low cost and energy consumption, as well as excellent sensing performance, endow the sensor a great potential for NH3 detection.
关键词： Ammonia,Three-Dimensional,Graphene,Gas Sensor,Foam
更新于2025-09-09 09:28:46
-
[IEEE 2018 Fourth Underwater Communications and Networking Conference (UComms) - Lerici (2018.8.28-2018.8.30)] 2018 Fourth Underwater Communications and Networking Conference (UComms) - Communication Operations at THEMO: the Texas A&M - University of Haifa - Eastern Mediterranean Observatory
摘要： We introduce the communication operations of THEMO: the new Texas A&M - University of Haifa - Eastern Mediterranean Marine Observatory. THEMO includes moored sensors, surface sensors, and secondary moorings. In all cases, the data from the sensors is transferred in near real-time to a shore station where it is freely shared with the community. Variety of communication aids are used. These include underwater acoustic communications to connect the sensors onboard the secondary moorings with THEMO’s surface platform, underwater inductive communication to connect the moored submerged sensors to the buoy’s controller, and radio communication connecting the mooring to the shore station. After deployment of almost a year, our results show that the communication performance are reliable, and the data ?ows in all weather conditions. In this paper, we describe the mooring’s communication applications, and share the details of the different communication components.
关键词： Marine Observatories,THEMO,Submerged sensor,Communication from marine buoys,Underwater acoustic communication,inductive communications
更新于2025-09-09 09:28:46