Sensor (Total 170374 Papers Found)

In this paper we propose a distributed and scalable algorithm that eliminates congestion within a sensor network, and that ensures the fair delivery of packets to a central node, or base station. We say that fairness is achieved when equal number of packets are received from each node. Since in general we have many sensors transmitting data to the base station, we consider the scenario where we have many-to-one multihop routing, noting that it can easily be extended to unicast or many-to-many ro ...
This contribution is concerned with joint angle calculation based on inertial measurement data in the context of human motion analysis. Unlike most robotic devices, the human body lacks even surfaces and right angles. Therefore, we focus on methods that avoid assuming certain orientations in which the sensors are mounted with respect to the body segments. After a review of available methods that may cope with this challenge, we present a set of new methods for: (1) joint axis and position identi ...
Digital cameras have become popular and many people are choosing to take their pictures with digital cameras instead of film cameras. When a digital image is recorded, the camera needs to perform a significant amount of processing to provide the user a viewable image. This processing includes white balance adjustment, gamma correction, compression and more (reference “Color Image Processing Pipeline in Digital Still Cameras” in this issue). A very important part of this image processing chai ...
We describe an application-specific integrated circuit (ASIC) front end for readout and control of planar high-frequency contactless inductive position sensors that contain transmitter and receiver coils on a fixed printed circuit board and a moving passive resonant target. Such an inductive position sensor suffers from transmitter-to-receiver signal coupling, which can result in a phase-sensitive offset; hence, an error in the position measurement occurs. For the receiver front end, we consider ...
Body Area Network (BAN) is considered as a promising technology in supporting medical and healthcare services by combining with various biological sensors. In this paper, we look at wearable BAN, which provides communication links among sensors on body surface. In order to design a BAN that manages biologic information with high efficiency and high reliability, the propagation characteristics of BAN must be thoroughly investigated. As a preliminary effort, we measured the propagation characteris ...
The harvest yield in vineyards can vary significantly from year to year and also spatially within plots due to variations in climate, soil conditions and pests. Fine grained knowledge of crop yields can allow viticulturists to better manage their vineyards. The current industry practice for yield prediction is destructive, expensive and spatially sparse - during the growing season sparse samples are taken and extrapolated to determine overall yield. We present an automated method that uses compu ...
In this paper, we present a stereovision algorithm for real-time 6DoF ego-motion estimation, which integrates image intensity information and 3D stereo data in the well-known Iterative Closest Point (ICP) scheme. The proposed method addresses a basic problem of standard ICP, i.e. its inability to perform the segmentation of data points and to deal with large displacements. Neither a-priori knowledge of the motion nor inputs from other sensors are required, while the only assumption is that the s ...
Laser frequency noise is a dominant noise background for the detection of gravitational waves using long-baseline optical interferometry. Amelioration of this noise requires near simultaneous strain measurements on more than one interferometer baseline, necessitating, for example, more than two satellites for a space-based detector or two interferometer arms for a ground-based detector. We describe a new detection strategy based on recent advances in optical atomic clocks and atom interferometry ...
In this work we discuss a new, but highly relevant, topic to the multimedia community; systems to inform individuals of their carbon footprint, which could ultimately effect change in community carbon footprint-related activities. The reduction of carbon emissions is now an important policy driver of many governments, and one of the major areas of focus is in reducing the energy demand from the consumers i.e. all of us individually. In terms of CO2 generated from energy consumption, there are t ...
The key design challenge in capsule endoscopic system is to reduce the area and power consumption while maintaining acceptable video quality. In this paper, a subsample-based image compressor for such endoscopic application is presented. The algorithm is developed around some special features of endoscopic images. It consists of a differential pulse coded modulation followed by Golomb-rice coding. Based on the nature of endoscopic images, several subsampling schemes on the chrominance components ...
This paper presents the design of a high accuracy outdoor navigation system based on standard dead reckoning sensors and laser range and bearing information. The data validation problem is addressed using laser intensity information. The beacon design aspect and location of landmarks are also discussed in relation to desired accuracy and required area of operation. The results are important for Simultaneous Localization and Map building applications, (SLAM), since the feature extraction and vali ...
This paper describes the ISRobotCar, an experimental autonomous electric vehicle that integrates Robot Operating System (ROS) and several sensors such as IBEO laserscanner, Inertial Measurement Unit (IMU), RTK-GPS, vision cameras, and magnet detectors for magnetic guidance. The development of a power steering controller and of a fuzzy path-following controller are particularly addressed. Finally simulations and experimental results of autonomous path-following control are presented. ...
Current fiducial marker detection algorithms rely on marker IDs for false positive rejection. Time is wasted on potential detections that will eventually be rejected as false positives. We introduce ChromaTag, a fiducial marker and detection algorithm designed to use opponent colors to limit and quickly reject initial false detections and grayscale for precise localization. Through experiments, we show that ChromaTag is significantly faster than current fiducial markers while achieving similar o ...
DNA sensor and microarray technologies offer powerful tools for addressing various questions in biological and medical science. When these sensors and microarrays operate in a label-dependent manner, a low concentration of nucleic acid targets can be detected with excellent sensitivity. Nonetheless, label-free detection techniques eliminate labeling steps and therefore may allow rapid and low-cost assays. Field-effect devices provide a promising label-free approach for the high-throughput real-t ...
MM-wave sensor operating at 94 GHz has been developed for detecting hidden objects such as weapons, explosives etc. It is based on a frequency modulated continuous wave (FMCW) and includes the two high gain horn-lens antennas integrated with a homodyne transceiver. The synthesized linear FMCW signal in K<inf>u</inf>-band is multiplied by a factor 6 to generate the transmitted signal at 94 GHz. An intermediate frequency (IF) signals obtained in the output port of the mixer is employed ...
Many studies have focused on land surface phenology as a means to characterize global climate. The Spinning Enhanced Visible Infra-Red Imager (SEVIRI) sensor onboard Meteosat Second Generation (MSG) geostationary satellite can also contribute to this task thanks to its adequate spatial and temporal resolutions. Here, four years of MSG-SEVIRI Normalized Difference Vegetation Index (NDVI) daily time series have been retrieved, which were then gap-filled with the help of an algorithm based on the i ...
Over the past 5 years, the on-chip detection and manipulation of magnetic beads via magnetoelectronics has emerged as a promising new biosensor platform. Magnetic bead sensing (MBS) provides a highly sensitive and specific technique, enabling these sensors to meet the diagnostic needs that are currently not met by existing technologies. Although many studies have proven the high physical sensitivity of magnetic sensors, the establishment of dose-response curves using MBS is unexplored and their ...
The vision of future networking is that not only people but also all things, services, and media will be connected and integrated, creating an Internet of Everything (IoE). Internet-of-Things (IoT) systems aim to connect and scale billions of devices in various domains such as transportation, industry, smart home/city, medical services, and energy systems. Different wireless and wired technologies link sensors and systems together, through wireless access points, gateways, and routers that in tu ...
These days Intrusion Detection System (IDS) which is defined as a solution of system security is employed to identify the abnormal activities in a computer system or network. So far different approaches have been utilized in intrusion detections, but unluckily any of the systems is not entirely ideal. Hence, the hunt of improved method goes on. In this progression, here I have designed an Intrusion Detection System (IDS), by applying genetic algorithm (GA) and fuzzy logic to efficiently detect v ...
An ultrasensitive temperature sensor based on a thin-core fiber modal interferometer (TCFMI) is proposed and demonstrated in this paper. After its middle is etched to a thin residual diameter, the TCFMI is sealed in a capillary tube filled with refractive index (RI) liquid. The thermo-optic effect of RI liquid turns the TCFMI into an ultrasensitive temperature sensor with sensitivity up to -22.23 nm/<sup>°</sup>C at 3.2 <sup>°</sup>C. The sensitivity is over ...
Gaze-tracking technology is highly valuable in many interactive and diagnostic applications. For many gaze estimation systems, calibration is an unavoidable procedure necessary to determine certain person-specific parameters, either explicitly or implicitly. Recently, several offline implicit calibration methods have been proposed to ease the calibration burden. However, the calibration procedure is still cumbersome, and gaze estimation accuracy needs further improvement. In this article, the au ...
Scene graphs have been a core element of 3D graphics since the publication of Inventor. However, in Virtual and Augmented Reality applications, 3D graphics are often interleaved with and controlled by real-world data provided by pose trackers, cameras and other kinds of sensors. In such a setup, the generalized concept of a Spatial Relationship Graph (SRG) might be better suited as an underlying data structure to describe the application and its components. In this paper, we will give an overvie ...
With the proliferation of pervasive computing in digital home and office environment there is an increasing demand for hands-free audio and video interfaces. Microphone arrays are already present on desktops and mobile computers, and camera arrays are in transition from being highly sophisticated prototypes to become affordable consumer devices soon. Thanks to increasing CPU power of general-purpose computers and higher bandwidth in wired and wireless networks, it now becomes possible to perform ...
Reliably detecting obstacles and identifying traversable areas is a key challenge in mobile robotics. For redundancy, information from multiple sensors is often fused. In this work we discuss how prior knowledge of the environment can improve the quality of sensor fusion, thereby increasing the performance of an obstacle detection module. We define a methodology to quantify the performance of obstacle detection sensors and algorithms. This information is used for environment-aware sensor fusion, ...
The objective of this study is to develop and investigate a reliable electrical interconnection for SiC-MEMS, which can sustain high mechanical and thermal loads in harsh environments. Platinum and palladium wire bonds, with a diameter of 25 microns, are used for interconnection of sensors with an operating temperature of 500 °C. Silicon testsensors with TiW/Pt bond pad metallization are processed in thin film technology. The test-chips are mounted with temperature stable assembly techniq ...
It is well known that blind system identification (BSI) algorithms misconverge in the presence of noise and that applications relying on such channel estimates must be designed to be robust to these blind system identification errors (BSIEs). However, there is currently no generalized model of BSIEs in the literature and instead, white Gaussian noise (WGN) is commonly assumed. This paper investigates the statistics of BSIEs based on a robust state-of-the-art BSI algorithm using both simulated an ...
The presence and concentration of oxygen in biological systems has a large impact on the behavior and viability of many types of cells, including the differentiation of stem cells or the growth of tumor cells. As a result, the integration of oxygen sensors within cell culture environments presents a powerful tool for quantifying the effects of oxygen concentrations on cell behavior, cell viability, and drug effectiveness. Because microfluidic cell culture environments are a promising alternative ...
The abundance of mobile and sensing devices, within our environment, has led to a society in which any object, embedded with sensors, is capable of providing us with information. A human digital memory, created with the data from these pervasive devices, produces a more dynamic and data rich memory. Information such as how you felt, where you were and the context of the environment can be established. This paper presents the DigMem system, which utilizes distributed mobile services, linked data ...
Phenomenal advances in nano-technology and packaging have made it possible to develop miniaturized low-power devices that integrate sensing, special-purpose computing, and wireless communications capabilities. It is expected that these small devices, referred to as sensors, will be mass-produced and deployed, making their production cost negligible. Due to their small form factor and modest non-renewable energy budget, individual sensors are not expected to be GPS-enabled. Moreover, in most appl ...
Although the interactions of transition metal complexes with biological molecules have been extensively studied, the use of luminescent transition metal complexes as intracellular sensors and bioimaging reagents has not been a focus of research until recently. The main advantages of luminescent transition metal complexes are their high photostability, long-lived phosphorescence that allows time-resolved detection, and large Stokes shifts that can minimize the possible self-quenching effect. Also ...
Modular multi-level converter (MMC) is one of the promising voltage source converter (VSC) topologies in recent years due to its modularity and scalability. Generally, the main technical challenge of different VSC topologies is the voltage balancing of sub-modules capacitors. Conventional sensor-based balancing techniques require a large number of voltage sensors which increases system cost and complexity. In this paper, a new balancing technique with a reduced number of voltage sensors is propo ...
  • István Matijevics,
  • 2009 7th International Symposium on Intelligent Systems and Informatics
  • 2009
This paper describes the implementation and configuration of the wireless sensor network using the Sun SPOT platform. Sun SPOT is a small electronic device made by Sun Microsystems. They have a wide variety of sensors attached to it. Sun SPOTs are programmed in a Java programming language, with the Java VM run on the hardware itself. It has a quite powerful main processor running the Java VM “Squawk” and which serves as an IEEE 802.15.4 wireless network node. The SPOT has flexible ...
This study proposes the bespoke design of a printed-circuit-board (PCB) integrated Rogowski coil to detect very high dI/dt's in an IGBT non-destructive tester. During reverse bias safe operating area (RBSOA) tests of an IGBT, failures of the transistor or of the freewheeling diode can lead to excessive dI/dt in the circuit. If properly detected, this information can be used to successfully implement non-destructive testing strategies, enabling the energy to be diverted from the device under test ...
To acquire continuous observation results is an essential demand to environmental monitoring. Wireless sensor networks (WSNs), composed of many tiny sensing equipment, give a good solution to collect continuously temporal and spatial data. Due to the limitation of WSNs, such as volume of wireless sensors, cost, energy, processing capability, and transmission distance, we need a solution in charge of collecting sensed data and transmitting it to the backend server. This solution has to handle all ...
This paper describes a new solution for integrating substation sensing, signal processing and decision making for more efficient monitoring, control and protection applications. The paper points out deficiencies of the existing approach and sets the requirements for the new approach. Once an architecture of the new solution is defined, further description of each of the elements of the new solution, namely optical sensor multiplexed network, distributed signal processing, and neural network base ...
Interaction with computer-based medical devices in the operating room is often challenging for surgeons due to sterility requirements and the complexity of interventional procedures. Typical solutions, such as delegating the interaction task to an assistant, can be inefficient. We propose a method for gesture-based interaction in the operating room that surgeons can customize to personal requirements and interventional workflow. Given training examples for each desired gesture, our system learns ...
Underwater wireless sensor network is the simple and basic way to monitor the quality of water using wireless sensor network (WSN) technology powered by solar panel. To monitor the quality of water over different sites as a real time application, a base station and distributed sensor nodes are suggested. A WSN technology like zigbee is used to connect the nodes and base station. To design and implement this model powered by solar cell and WSN technology is a challenging work. Through WSN various ...
Adaptive Periodic-Correlation (APC) algorithm was developed for use in extended-scene Shack-Hartmann wavefront sensors. It provides high-accuracy even when the sub-images in a frame captured by a Shack-Hartmann camera are not only shifted but also distorted relative to each other. Recently we found that the shift-estimate error of the APC algorithm has a component that depends on the content of extended-scene. In this paper we assess the amount of that error and propose a method to minimize it. ...
The sensing properties of carbon nanomaterials are studied and compared in this paper. Graphene oxide and multi-walled carbon nanotube films were used as active layers of chemoresistive gas sensors and characterized at room temperature towards ammonia detection in concentration levels from 100 ppm to 500 ppm in air. We conclude that graphene oxide based sensor has higher response (2.4% to 7.4% in range from 100 ppm to 500 ppm) than the multi-walled carbon nanotubes based one (1.0-2.4%). On the o ...
  • Bin Wang, Qiao Lin,
  • 2011 IEEE 24th International Conference on Micro Electro Mechanical Systems
  • 2011
We present a MEMS-based differential scanning calorimetric (DSC) device combining highly sensitive thermoelectric sensing, on-chip self-calibration, and microfluidic regulation for thermodynamic characterization of biomolecular samples on a minimized scale. The device integrates well-defined microfluidic reaction chambers and utilizes a three-dimensional structure in which a layer of resistive microheaters and temperature sensors are precisely aligned to these chambers to provide uniform heating ...