The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A Terahertz planar periodic structure (engineered material), which shows several sharp Fano resonances, is introduce. These resonances are due to the small asymmetries of the structure which allow excitation of trapped modes. These sharp resonances can be used for biomedical sensing applications. HFSS simulation results are presented.
Our real-time continuous gesture recognition system addresses problems that have previously been neglected: handling both gestures that are characterized by distinct paths and gestures characterized by distinct hand poses; and determining how and when the system should respond to gestures. Our probabilistic recognition framework based on hidden Markov models (HMMs) unifies the recognition of the two...
Flocking with obstacle avoidance of multi-agents is a significant problem. In this paper, a flocking algorithm in the presence of arbitrary shape obstacles avoidance is provided both in 2D space and 3D space. When obstacles are sensed by α-agents, β-agents which denote obstacles will guide the α-agent driving away from obstacles in a fastest route. We present an approach to determine the position...
Human gait capture by vision plays an important role in the guidance for the rehabilitation of the lower limbs dysfunction patients. Unfortunately, it is not included in most of the present rehabilitation devices. This paper presents a novel real-time system for human gait capture by detecting the joints trajectory to obtain 3-D information of the joints motion by Kinect. Firstly, we put markers on...
We investigate the problem of optimizing the shape and location of sensors and actuators for evolution systems driven by distributed parameter systems or partial differential equations (PDE). We consider wave, Schrödinger and heat equations on an arbitrary domain Ω, in any space dimension, and with suitable boundary conditions (if there is a boundary) which can be of Dirichlet, Neumann, mixed or Robin...
We present a decentralized controller to keep a group of agents at equal spacing while moving around the perimeter of a loop defined by a constant distance from a convex polygon, motivated by a cooperative containment problem. Traveling at constant speed, the agents achieve and maintain their formation by using small steering adjustments to equalize the distance between themselves and their respective...
Random projection is a tried-and-true technique in signal processing for reducing sensing complexity while maintaining acceptable performance of downstream processing tasks. In this paper, we investigate random linear projection of point clouds followed by topo-logical data analysis for computing persistence diagrams and Betti numbers. In this first empirical study of its kind in the literature, we...
This paper proposes a frequency reconfigurable antenna system designed for cognitive radio applications. The antenna structure consists of a sensing antenna and a frequency reconfigurable antenna system. The sensing antenna scans the channel to discover frequency bands while the reconfigurable section is tuning to communicate within these bands. A reconfigurable antenna consists of five different...
In this paper, autonomous target localization is achieved on quadrotor helicopter, with the use of 2D laser rangefinder and fixed monocular camera. Color-featured target is located in 3D space without prior knowledge of its size or shape. Coordinate systems of camera and laser rangefinder are integrated to establish body-fixed reference coordinate system for both localization and flight control. Rotation...
This paper studies the performances of the popular gradient-based formation-control strategies for teams of autonomous agents when the agents' range measurements are coarse. Since the dynamics of the resulting closed-loop system are discontinuous, Filippov solutions to non-smooth dynamical systems are introduced. Similar to the existing stability results for triangular formations with precise range...
Among different remote sensing applications, change detection deserves specific consideration. The importance of this area is its applicability on damage assessment after natural disasters. Fortunately, recent sensors allow researchers to develop advanced change detection methods. Some of these benefit from panchromatic or multispectral remote sensing images, whereas others use 3D data besides the...
Extensive use of wireless sensor networks for various applications like surveillance, habitat monitoring, battlefield etc., demand high probability of coverage and connectivity. The first issue deals with how well the sensor network will be able to detect the event by the sensor nodes and secondly, how efficiently the information will be communicated to the gateway node. In many applications, sensors...
Internet has formerly been used to link ideas, then people and now it is starting to connect things together. IoT constitutes a good paradigm to enable people to design and modify things, and then sharing their designs and modifications. Through the internet, things are nowadays able to exchange raw data and information thus enabling the development of a new class of interconnected smart objects....
Touch sensors are one of the most fundamental input devices of many different applications these days. However, most dominant 2D touch sensing technologies are based on a grid of connections and sensors, which are thick and cumbersome. Thus flexibility and form factor do matter. In this paper, we propose an algorithm to design a flexible two-dimensional touch-sensitive surface using inkjet printing...
We fabricated the improved waveguide-type Kretschmann-structure surface plasmon resonance sensor by precisely controlling the fabrication process to show better characteristics close to a theoretical value of 60/RIU for a wider refractive-index range.
For shape reconstruction of the flexible plate structure with perceptive distributed orthogonal curvature information, a new online curvature calibration method for flexible structure is researched. Virtual standard circle-arcs of the measured flexible structure are obtained by finite element method to substitute real standard circle-arcs in traditional curvature calibration methods. The curvature...
In this paper we present a method for the generation of hand postural synergies for different precision grasp types to be used in dextrous robot hands. Our method records the robot hand motions while teleoperated by human subjects via a dataglove, doing different grasp types on a series of objects. This exploits the fact that humans automatically compensate for calibration errors on the glove to robot...
3D shape sensing using Fiber Bragg gratings has attracted the interest of several research groups in recent years, but so far no possibility has been presented to optimize the sensing system by simulation. Almost always, the gratings (the points of strain measurement) are distributed equidistantly, and the reconstruction algorithm has not been verified by simulation. In this paper we present our simulation...
Bio-kinematic characterisations of human exercises constitute dealing with parameters such as velocity, acceleration, joint angles, etc. A majority of these are measured directly from various sensors ranging from RGB cameras to inertial sensors. However, due to certain limitations associated with these sensors, such as inherent noise, filters are required to be implemented to subjugate the effect...
A defect which is axially oriented with small size is hard to detect in conventional system. CMFL (Circumferential Magnetic Flux Leakage) type PIG (Pipelines Inspection Gauge) in the NDT (Nondestructive Testing), is operated to detect this defect called axially oriented cracks in the pipe. It is necessary to decompose the size and shapes of cracks for the maintenance of underground pipelines. This...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.