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 method that optimizes visual odometry, especially using visual odometry in the scene with absence of features is proposed in this paper. First, in order to estimate the pose of camera when the effect of using feature-based method is not good enough, direct method is implemented as the solution. Second, comparing with traditional visual odometry method, this method takes the environment restriction...
We demonstrate a BOTDA system based on optimized compensation scheme for the propagation loss of the pump pulse by distributed Brillouin amplification. Near-constant Brillouin gain is obtained in the distributed measurement of Brillouin frequency along 51 km optical fiber with 20 cm spatial resolution.
In this talk experimental and theoretical studies on the stimulated Brillouin scattering in two- and few-mode fibers are presented including the observation and characterization of intermodal and intramodal Brillouin scatterings and Brillouin dynamic gratings. The potential applications to distributed sensors will be also discussed.
According to the problem of point-to-point global path planning, this paper presents an A∗ algorithm based on the grid map and V-graph (Visual graph) environmental model for the mobile robot to obtain the optimal path. The algorithm mainly consists of three parts, namely building the grid map, designing the visual point-to-point lines and devising the search strategy of the path planning. The quantized...
Robotic simultaneous localization and mapping (SLAM) confronts extreme challenge in collapsed, cluttered, GPS-signal unreliable environments of search and rescue (SAR). Our improved SLAM methods aim to mobile robot performing SAR requirements which comprise the significant objects identification, loop closure perceiving, exploration area coverage, and the other performances. We developed efficient...
This paper introduces a new integrated algorithm to achieve the complete coverage path planning (CCPP) task for the mobile robot in a given obstacles-included terrain. The algorithm combines the cellular decomposition approach and the chaotic Standard map together to design the coverage procedure. The cellular decomposition approach decompose the target region into several rectangular feasible sub-regions...
We present an inductive powering system of a two-turns loop antenna which includes external and implanted antennas each with a cylinder magnetic core. It can wirelessly transfer power to loop antenna of a compact plane structure in cortex. Compared to single antenna without magnetic core, it can achieve highly-efficient (24.8%) wireless power transferring to implanted loop antenna and reduce the SAR...
The master-followed multiple robots interactive cooperation simultaneous localization and mapping (SLAM) schemes were designed in this paper, which adapts to search and rescue (SAR) cluttered environments. In our multi-robots SLAM, the proposed algorithm estimates each of multiple robots current local sub-maps in cases where every robot is considered as a mobile distributed particle, and each robot...
A Brillouin optical correlation domain analysis (BOCDA) system using the time-domain data processing combined with the differential measurement scheme is proposed, where the measurement range could be effectively enlarged to 10 km while maintaining the high spatial resolution of less than 5 cm by simultaneously interrogating multiple correlation peaks.
Social insects can flexibly respond to variational environment without global information and centralized control, and inspired by the collective behavior in ants and bees, this paper proposes a dynamical response threshold model (DRTM) in which the robots perform task allocation in self-organized manner. The proposed method depends on neither the global information nor the communication between robots...
The information-fusion methods are developed in this paper for mobile robots performing simultaneous localization and mapping (SLAM) adapting search and rescue (SAR) environment. Fusion systems consist of laser range finder (LRF) sensors, localization sonars, gyro odometry, Kinect-sensor, RGB-D camera, and other proprioceptive sensors. The integrated particle filter algorithms run through the proposed...
The NRC Robotic Exoskeleton (NREX), an upper-extremity, rehabilitation robotic exoskeleton developed for daily life exercises, and treatment of hemiplegic or spinal-cord injured people, was improved by the National Rehabilitation Center, Korea. The shoulder module, which had restricted movement, was improved via additional passive-axis movements with rubber bands. In addition, NREX can now be used...
The importance of the mechanical behavior of electronic packages starts at the beginning of the package assembly process and continues through performance testing procedures at different levels. Predicting an electronic package's mechanical performance by simulation is an ongoing challenge and pursuit of both industry and academia. To achieve this goal, advanced simulation or analyses should have...
In this paper, the processing and integration challenges addressed during the 3D packaging of a ~400 mm2 logic die are presented and discussed. The logic die was fabricated using GLOBALFOUNDRIES' 14-nm technology with 5x55 µm Through Silicon Vias (TSVs) integrated in the process as a via middle flow [1]. Fully fabricated test wafers were thinned down to 50 µm, using Amkor Technology's Middle End of...
Brillouin optical time domain analysis (BOTDA) enhanced by the tailored compensation for the propagation loss of a pump pulse is experimentally demonstrated for long-distance and high-resolution distributed sensing. Distributed Brillouin amplification (DBA) of the pump pulse is applied in addition to an ordinary BOTDA configuration, where the frequency modulation with time-dependent amplitude variation...
A Brillouin optical correlation domain analysis (BOCDA) system using time-domain data processing for concurrently interrogating a plurality of sensing positions is proposed, where the time-domain data processing combined with differential measurement effectively enhances the measurement range and measurement time as much as the spatial resolution of the BOCDA system. In the experiment, the distribution...
Discriminative measurement of strain and temperature distribution is experimentally demonstrated by optical time-domain reflectometry of Brillouin dynamic grating (BDG-OTDR) in an elliptical core two-mode fiber (e-core TMF). The acoustic waves generated by the amplified spontaneous Brillouin scattering of LP01 mode in x-polarization are used to reflect the LP11 mode in x- and y-polarizations. Distribution...
Implanted miniaturized device could enable efficient healthcare and clinical applications, such as monitoring, diagnosis and treatment. In this paper, characterization of the implantable intra-body communication based on capacitive coupling has been researched. The transfer function of implantable intra-body communication based on capacitive coupling was derived and the corresponding parameters were...
Compared with the infrared focal plane array (IRFPA) based on amorphous silicon (α-Si), IRFPA based on vanadium oxide (VOx) has the advantages of big temperature coefficient, low noise and so on. Therefore, it is believed that VOx IRFPA has important application in both military and civil field. In this paper, the designs of driving module and signal processing module of VOx IRFPA are proposed. Firstly,...
Distributed measurement of hydrostatic pressure is demonstrated based on optical time domain analysis of Brillouin dynamic grating (BDG) in polarization maintaining fibers (PMF's). Spectral shift of the BDG is analyzed as a function of hydrostatic pressure from 14.5 psi (1 bar) to 884.7 psi (61 bar) using bow-tie PMF's and photonic crystal PMF (PM-PCF) with 1 m spatial resolution. The experimental...
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.