Utilizing a variation in the relative refractive index on the dew-prone surface of an optical waveguide, we propose a sensor technology designed to detect dew condensation. The dew-condensation sensor is made up of these four components: a laser, a waveguide, its filling medium (i.e., the material within the waveguide), and a photodiode. The transmission of incident light rays, facilitated by local increases in relative refractive index caused by dewdrops on the waveguide surface, leads to a decrease in light intensity within the waveguide. By filling the waveguide's interior with water, specifically liquid H₂O, a dew-attracting surface is generated. The sensor's geometric design was initially constructed by accounting for the curvature of the waveguide and the incident angles of the light rays. Furthermore, simulations assessed the optical suitability of waveguide media with diverse absolute refractive indices, including water, air, oil, and glass. Bindarit Following experimental trials, the sensor using a water-filled waveguide displayed a wider variation in measured photocurrent levels between dew-laden and dew-free environments compared to sensors with air- or glass-filled waveguides, a result of water's high specific heat. The sensor's water-filled waveguide facilitated excellent accuracy and reliable repeatability.
The incorporation of engineered features can hinder the speed of Atrial Fibrillation (AFib) detection algorithms in providing near real-time results. In the context of automatic feature extraction, autoencoders (AEs) allow for the creation of features tailored to the demands of a specific classification task. ECG heartbeat waveforms' dimensionality can be decreased and subsequently classified by coupling an encoder with a classifier. We present evidence that morphological characteristics obtained from a sparse autoencoder model suffice to distinguish atrial fibrillation (AFib) from normal sinus rhythm (NSR) beats. The model's design incorporated rhythm information alongside morphological features, employing a new short-term feature called Local Change of Successive Differences (LCSD). Utilizing single-lead electrocardiogram recordings from two publicly accessible databases, and leveraging attributes derived from the AE, the model demonstrated an F1-score of 888%. Morphological features, as evidenced by these results, appear to be a definitive and adequate criterion for electrocardiogram (ECG) atrial fibrillation (AFib) identification, particularly in customized patient-centric applications. Compared to cutting-edge algorithms, which demand extended acquisition durations for extracting engineered rhythmic characteristics, this method presents a significant advantage, additionally requiring meticulous preprocessing. This work, in our estimation, represents the initial demonstration of a near real-time morphological approach for AFib detection during naturalistic ECG acquisition using mobile devices.
Word-level sign language recognition (WSLR) serves as the crucial underpinning for continuous sign language recognition (CSLR), the method for deriving glosses from sign language videos. Identifying the correct gloss from a series of signs, along with accurately marking the beginning and end points of each gloss within sign video footage, continues to present a considerable difficulty. Employing the Sign2Pose Gloss prediction transformer model, we present a systematic approach to gloss prediction in WLSR. The primary function of this work is to increase the accuracy of WLSR's gloss predictions, all the while minimizing the expenditure of time and computational resources. Opting for hand-crafted features, the proposed approach avoids the computationally expensive and less accurate automated feature extraction methods. A method for key frame selection, leveraging histogram difference and Euclidean distance metrics, is proposed to eliminate superfluous frames. The model's ability to generalize is improved by augmenting pose vectors with perspective transformations and joint angle rotations. For the normalization step, we utilized YOLOv3 (You Only Look Once) to detect the signing space and monitor the hand gestures of the individuals signing in the frames. In WLASL dataset experiments, the proposed model obtained top 1% recognition accuracy scores of 809% on WLASL100 and 6421% on WLASL300. The proposed model achieves performance exceeding that of the best current approaches. Keyframe extraction, augmentation, and pose estimation were integrated to enhance the proposed gloss prediction model's precision in identifying minor postural differences, thereby boosting its performance. Introducing YOLOv3 demonstrably increased the precision of gloss predictions and successfully curtailed model overfitting. Bindarit Considering the WLASL 100 dataset, the proposed model displayed a 17% improvement in performance metrics.
Maritime surface ships can now navigate autonomously, thanks to recent technological progress. A range of diverse sensors' accurate data is the bedrock of a voyage's safety. Despite this, sensors with differing sampling rates preclude simultaneous data capture. The accuracy and trustworthiness of perceptual data, when fused, deteriorate if discrepancies in sensor sample rates are ignored. Ultimately, elevating the precision of the merged data regarding ship location and velocity is important for accurately determining the motion status of ships during the sampling process of every sensor. An incremental prediction method, employing unequal time intervals, is presented in this paper. The technique factors in the high dimensionality of the estimated state and the nonlinear characteristics of the kinematic equation. Employing the cubature Kalman filter, a ship's motion is estimated at uniform time intervals, utilizing the ship's kinematic equation. Thereafter, a ship motion state predictor based on a long short-term memory network structure is devised. The increment and time interval from prior estimated sequences are fed into the network as inputs, and the output is the motion state increment at the targeted time. The traditional long short-term memory prediction technique's accuracy is bettered by the suggested technique, which effectively lessens the impact of the speed gap between test and training data on prediction results. To conclude, comparative trials are undertaken to confirm the precision and effectiveness of the proposed method. The root-mean-square error coefficient of prediction error, on average, saw a roughly 78% decrease across diverse modes and speeds when compared to the conventional, non-incremental long short-term memory prediction method, as indicated by the experimental results. Moreover, the suggested predictive technology and the traditional method demonstrate practically the same algorithmic durations, potentially meeting real-world engineering specifications.
Worldwide, grapevine health suffers from the impact of grapevine virus-associated diseases, including the notable grapevine leafroll disease (GLD). Unreliable visual assessments or the high expense of laboratory-based diagnostics often present a significant obstacle to obtaining a complete and accurate diagnostic picture. Leaf reflectance spectra, measurable through hyperspectral sensing technology, enable the prompt and non-destructive detection of plant diseases. The objective of this study was to identify viral infection in Pinot Noir (red-fruited wine grape) and Chardonnay (white-fruited wine grape) grapevines, through the application of proximal hyperspectral sensing. Data on spectral properties were gathered for each cultivar at six specific times during the grape growing season. A predictive model regarding the presence/absence of GLD was formulated utilizing partial least squares-discriminant analysis (PLS-DA). Temporal changes in canopy spectral reflectance demonstrated the harvest point to be associated with the most accurate predictive results. Pinot Noir's prediction accuracy was measured at 96%, whereas Chardonnay's prediction accuracy came in at 76%. By examining our results, the optimal time for GLD detection is revealed. Unmanned aerial vehicles (UAVs) and ground-based vehicles, coupled with hyperspectral methods, enable large-scale disease surveillance in vineyards on mobile platforms.
In order to measure cryogenic temperatures, we propose a fiber-optic sensor design using epoxy polymer to coat side-polished optical fiber (SPF). The SPF evanescent field's interaction with the surrounding medium is considerably heightened by the thermo-optic effect of the epoxy polymer coating layer, leading to a substantial improvement in the temperature sensitivity and ruggedness of the sensor head in extremely low-temperature environments. In the temperature range of 90 to 298 Kelvin, the interconnections within the evanescent field-polymer coating led to a transmitted optical intensity variation of 5 dB and an average sensitivity of -0.024 dB/K, according to test results.
Microresonators are integral to numerous scientific and industrial applications. Researchers have explored various methods of measurement using resonators, focusing on the shifts in their natural frequency, to address a broad spectrum of applications, including the determination of minute masses, the evaluation of viscosity, and the characterization of stiffness. Greater natural frequency of the resonator translates to heightened sensor sensitivity and a superior high-frequency performance. We present, in this study, a process for creating self-excited oscillation with a higher natural frequency through leveraging higher mode resonance, without compromising the resonator's overall size. The self-excited oscillation's feedback control signal is precisely shaped using a band-pass filter, ensuring that only the frequency associated with the desired excitation mode is retained. Sensor placement for feedback signal construction, essential in mode shape-based methods, can be performed with less precision. Bindarit From the theoretical investigation of the equations that dictate the coupled resonator and band-pass filter dynamics, we discern that self-excited oscillation manifests in the second mode.
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