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.
Rapidly dropping costs and increasing capabilities of robotic systems are creating unprecedented opportunities for the world of scientific research. Remote sample collection in conditions that were once impossible due to expense, location, timing, or risk are now becoming a reality. Of particular interest in marine biological research is the aspect of removing additional stressors in the form of humans...
The paper describes the way to get a useful component of the ultrasonic defectoscope signal at high-rise reverberation and noise interference. The useful component is got with the thresholding of detail factors of a wavelet-decomposition. Probability of the 1st and 2nd type mistake is examined.
We have recently completed a project to create a swarm of 20 miniature, 1.5 liter vehicles that can be deployed autonomously to track underwater currents. The results of several afternoons of experiments, where the vehicles were kept at depth, indicate the passage of several internal waves, illustrating their utility. However, a time consuming and complicated aspect of their deployment is the installation...
Seabed characteristics (geoacoustic properties and scattering strength) are critical parameters for sonar performance predictions. However, this bottom information is considered very difficult and expensive to achieve in the scientific community. In this report, an efficient method for inferring the seabed properties is presented; it relies on a previous methodology using long moored or drifting hydrophone...
This paper addresses the issue of estimating underwater noise mapping of a moving ship using a static linear hydrophone array. In the context of pass-by experiments, moving-source mapping is classically performed using an extension of conventional beamforming to moving sources: beamforming-MS. The main issue of moving-source mapping using beamforming-MS is the poor spatial resolution of two close...
This paper demonstrates the validity of vehicle acceleration/deceleration signals derived from 1Hz sampled GPS position and OBDII velocity sensors through comparison to 40Hz sampled accelerometer measurements. Measurement of driver acceleration and deceleration is important because it is a key measure of driving habits. Ideally, these measurements should not require the cost and complexity of installing...
Similar to the atmosphere, coherent structures, e.g., fronts, exist in the ocean. These frontal structures are known to be highly productive, supporting the whole spectrum of marine life. Ocean fronts are dynamic in time and space, and are a key component to a comprehensive knowledge of ocean dynamics and aquatic ecosystems in relation to climate change. However, dynamic features such as fronts are...
Fog is one of the major sources of accident. It is the natural phenomenon which reduces the contrast and fades the colors of objects in the scene with respect to their distance from the driver. It results in poor visibility and thus brings great difficulty in driving, object identification, object tracking and monitoring in outdoor images. As a remedy to these problems we have proposed an algorithm...
This paper presents results of an unique active absorber system for broad band vibration compensation where the used controller is based on an adaptive feedforward/feedback control scheme. The experimental results show that an enhanced ride comfort can be achieved by eliminating fatigue from low frequency noise and vibrations.
This paper presents the development of a state observer for a 2-axle railway vehicle with solid axle wheelsets. A plan view model of the vehicle is presented and a Kalman filter is developed to estimate 18 states from 8 inertial measurements. The required measurements are the lateral acceleration and yaw velocity of the vehicle body and the same measurements plus the roll velocity for the two wheelsets,...
This paper deals with the identification of the physical parameters of a passenger car. After studying the local structural identifiability of two models of different complexity, the identifiable parameters which are unknown or difficult to measure are identified by minimising a multivariable, cost criterion in terms of maximum likelihood. The choice of the optimisation algorithm is considered, before...
This work presents new results for state estimation based on noisy observations suffering from two different types of uncertainties. The first uncertainty is a stochastic process with given statistics. The second uncertainty is only known to be bounded, the exact underlying statistics are unknown. State estimation tasks of this kind typically arise in target localization, navigation, and sensor data...
Vehicles may be recognized from the sound they emit when driving along a road. Characteristic acoustic finger prints and audio features can be used to increase the robustness of existing video based vehicle tracking and classification algorithms. Using this information in a multisensor surveillance system helps to improve various parameters such as recognition rates, detection times and robustness...
This contribution deals with the role and the performance of echocompensation and noise suppression, when used in combination with speech recognition systems. For two applications of interest (speech control in car or via telephone) there are quite significant differences to classical echocompensation and noise suppression for telephone conferences. It will be pointed out, how the systems are structured,...
This paper introduces a novel method that effectively and efficiently encodes the spatial geometric information of bag of visual words (BoW) to boost the performance of large scale partial duplicate image discovery and clustering. The loose cyclic spatial verification (LCSV) technique projects the locations of BoWs onto the perimeter of a circle centred around their geometric centroid and encodes...
This paper presents the hyper-elastic Latex film as the new material for flapping wings novelly. Compared to one of the conventional flapping wings using PET, the new Latex wing reduces the noise with 15.93 dB at least. Both wings have a wingspan of 20 cm and work at the flapping frequency of 13.3 Hz. The leading edge spars and the stiffened ribs of both wings are made of carbon fiber. This newly...
Vehicle identification and traffic accident detection plays an important role in the Intelligent Transportation System. Vehicle image segmentation is the key technological foundation for further identification and detection processing. This article improves the inadequacy of Fuzzy C-Means (FCM) clustering algorithm by proposing the Spatial Constrained FCM (SCFCM) algorithm. Firstly, the each pixel's...
Recently, hybrid vehicles (HVs) have become widespread. In the current HVs, a high-voltage (200 V) battery supplies power to the Power Control Unit (PCU) for driving a motor, generator and air conditioner compressor. It is expected that such kinds of power electronic devices will increase in number in the future. We previously proposed a power line communication (PLC) that uses a high-voltage power...
In this paper, velocity estimation method for caster odometers is proposed. Caster odometer is a sensor of travel distance and attitude angle using caster mechanism that has two-degree of rotational freedoms. We calculate velocities of a vehicle utilizing the output measured by caster odometers, however, the caster mechanism has nonlinearity component. To deal with the nonlinearity of the caster mechanism,...
The recent trend of proliferation of road accidents and fatalities, calls for a methodology that can appease the burden on the drivers during certain crucial moments, requiring fast response and decision making. This paper expatiates a novel and effective procedure for determining the steering angle required to keep the vehicle in the middle of the lane. The procedure used is divided in multiple stages...
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.