Recent studies demonstrated that diastolic heart sounds, recorded with an electronic stethoscope, contain markers of coronary artery disease (CAD). A difficult is that the CAD-related sound is very weak and recordings...
详细信息
Recent studies demonstrated that diastolic heart sounds, recorded with an electronic stethoscope, contain markers of coronary artery disease (CAD). A difficult is that the CAD-related sound is very weak and recordings are often contaminated by noise. the current study analyses the noise contamination of 633 stethoscope recordings from a clinical environment. Respiration noise, ambient noise, recording noise and abdominal noise were identified in the recordings and were classified according to duration and intensity. To monitor how noise influences the classification performance AR-pole magnitudes were extracted from boththe 25-250 Hz frequency band and the 250-1000 Hz frequency band. the classification performance was quantified by the Area Under the receiver operating Characteristic (AUC). Ambient noise was present in 39.9% of the recordings and was the most common noise source. Abdominal noise was the least common noise source, present in 10.8% of the recordings. the best pole, with respect to detection of CAD, extracted from the 250-1000 Hz frequency band was sensitive to noise, since the AUC dropped from 0.70 in to 0.57 when noisy recordings were included. Contrary the best pole from the 25-250 Hz frequency band was relatively robust against noise, since the AUC dropped from 0.73 to only 0.70 when noisy recordings were included. the study demonstrated that noise contamination is a frequent problem and that features from lower frequency bands are more robust against noise than features from higher frequency bands.
Olivia 2.0 is a Social Robot designed to interact and serve in office environment as a Robotic Receptionist. this is the forth model of Service Robot developed by A*STAR robotics Team in Singapore. For a start, the oc...
详细信息
ISBN:
(纸本)9781424448920;9781424448937
Olivia 2.0 is a Social Robot designed to interact and serve in office environment as a Robotic Receptionist. this is the forth model of Service Robot developed by A*STAR robotics Team in Singapore. For a start, the occupation & background story of Olivia as a receptionist has set a common ground between human and robot for interaction around topics fitting to the job. the use of vision technology enabled Olivia to detect the presence of a visitor standing in front of her so that she will initiate a dialogue. through speech recognition technology and careful designed dialogue management system, visitors are able to converse with Olivia to know more about the amenities in Fusionopolis building as well as to engage in small talk. Taking the persona of a 5 years old kid, with a cute face and child voice, coupled with nice decorations has set the stage for a fun interaction time, as Olivia proceeds to engage the visitor to play a simple game that showcased object recognition and tracking capability. Olivia is built with advanced Mechatronics design with 13 degree of freedom for head, body and hands motions. the advance motion control algorithm and imitation learning software trained her well to display humanlike hand gestures and upper body movements. We noticed the lively gestures coupled with expressive robotic voice are very crucial to draw attention from human for the continuous engagement with Social Robot. We knew that this would be a valuable field trial opportunity whereby many visitors were having first encountering with service robot. We took advantage to study social acceptance by taking video recording for every human-robot interactions, follow by inviting visitors to participate in on-site feedback gathering with questionnaires. Of more than 100 questionnaires completed, 62% gave an overall rating of good and above, several expressed that the response of the robot is slow and 75.5% found that the robot is able to recognize their speech without any difficulti
Sleep disorders affect a great percentage of the population. the diagnostic of these disorders is usually made by a polysomnography, requiring patient's hospitalization. Low cost ambulatory diagnostic devices can ...
详细信息
ISBN:
(纸本)9789898425027
Sleep disorders affect a great percentage of the population. the diagnostic of these disorders is usually made by a polysomnography, requiring patient's hospitalization. Low cost ambulatory diagnostic devices can in certain cases be used, especially when there is no need of a full or rigorous sleep staging. In this paper, several methods to extract features from 6 EEG channels are described in order to evaluate their performance. the features are selected using the R-square Pearson correlation coefficient (Guyon and Elisseeff, 2003), providing this way a Bayesian classifier withthe most discriminative features. the results demonstrate the effectiveness of the methods to discriminate several sleep stages, and ranks the several feature extraction methods. the best discrimination was achieved for relative spectral power, slow wave index, harmonic parameters and Hjorth parameters.
Flexibility, throughput, maintainability, scalability, reliability and low cost: that are the main optimization criteria of material flow systems (MFS). the most of this criteria are diametrical and so hardly to impro...
详细信息
ISBN:
(纸本)9789896740009
Flexibility, throughput, maintainability, scalability, reliability and low cost: that are the main optimization criteria of material flow systems (MFS). the most of this criteria are diametrical and so hardly to improve considerably with today's existing transportation devices and their static control structures. Hence a new approach of a transportation systems with cooperating robotic units and a novel cognitive environment will be presented. this approach will combine different research areas like robotics and wireless sensor networks to achieve a higher degree of flexibility.
Estimating a robot's reachable workspace is a fundamental problem in robotics. For simple kinematic chains within an empty environment this computation can be relatively straightforward. For mobile kinematic struc...
详细信息
ISBN:
(纸本)9789896740009
Estimating a robot's reachable workspace is a fundamental problem in robotics. For simple kinematic chains within an empty environment this computation can be relatively straightforward. For mobile kinematic structures and cluttered environments, the problem becomes more challenging. An efficient probabilistic method for workspace estimation is developed by applying a hierarchical strategy and developing extensions to a probabilistic motion planner. Rather than treating each of the degrees of freedom (DOFs) 'equally', a hierarchical representation is used to maximize the volume of the robot's workspace that is identified as reachable for each probe of the environment. Experiments with a simulated mobile manipulator demonstrate that the hierarchical approach is an effective alternative to the use of an estimation process based on the use of a traditional probabilistic planner.
this article studies the use of task partitioning as a way to reduce interference in a spatially constrained harvesting task. Interference is one of the key problems in large cooperating groups. We present a simple me...
详细信息
ISBN:
(纸本)9789896740009
this article studies the use of task partitioning as a way to reduce interference in a spatially constrained harvesting task. Interference is one of the key problems in large cooperating groups. We present a simple method to allocate individuals of a robotic swarm to a partitioned task, and show that task partitioning can increase system performance by reducing sources of interference. the method is experimentally studied, both in an environment with a narrow area and an environment without this constraint. the results are analyzed and compared to the case in which task partitioning is not employed.
the aim of this paper is to describe a research roadmap for a multi-domain model-driven embedded systems design approach and the corresponding meta-model which is applicable to the domain of complex Industrial Automat...
详细信息
ISBN:
(纸本)9781424437597
the aim of this paper is to describe a research roadmap for a multi-domain model-driven embedded systems design approach and the corresponding meta-model which is applicable to the domain of complex Industrial automation and control Systems (IACS). the special requirements of the industrial automation sector are taken into account by this novel approach, utilizing existing model-driven techniques. this approach is currently being developed in the Framework Seven (FP7) Embedded Systems Design project MEDEIA funded by the European Commission.
this paper analyzes the comfort of wheelchair users when a sliding-mode trajectory-tracking controller is used. the transmission of the horizontal (fore-and-aft) vibration to the head-neck complex (HNC) in the seated ...
详细信息
Nowadays available broadband wireless communication technologies offer a broad spectrum of applications and the todays availability of UMTS technology has a great potential in the area of networked robotics. this work...
详细信息
ISBN:
(纸本)9789896740009
Nowadays available broadband wireless communication technologies offer a broad spectrum of applications and the todays availability of UMTS technology has a great potential in the area of networked robotics. this work investigates teleoperation of mobile robots via UMTS communication links. First, several scenarios with artificially generated command traffic between mobile robot and operator are analyzed in order to gain knowledge of the link behavior. In a next step real mobile robot hardware is remote controlled via UMTS. thereby, the robot transmits sensor data and a video stream of its onboard camera while receiving commands from the operator. the focus of this work is set on the measurement and analysis of the round trip time and the packet inter-arrival time of data in different scenarios like the connection of two UMTS nodes, the connection of an Internet PC and an UMTS node, or the behavior of several UMTS nodes generating a large amount of data. the results clearly show how applications for mobile robot teleoperation can efficiently use UMTS communication in order to allow seamless teleoperation between operator and hardware in distant locations.
In the paper a fast computational routines for identification algorithms for recovering nonlinearities in Hammerstein systems based on orthogonal series expansions of functions are proposed. It is ascertained that bot...
详细信息
ISBN:
(纸本)9789898111999
In the paper a fast computational routines for identification algorithms for recovering nonlinearities in Hammerstein systems based on orthogonal series expansions of functions are proposed. It is ascertained that both, convergence conditions and convergence rates of the computational algorithms are the same as their much less computationaly attractive 'theoretic' counterparts. the generic computational algorithm is derived and illustrated by three examples based on standard orthogonal series on interval, viz. Fourier, Legendre, and Haar systems. the exemplary algorithms are presented in a detailed, ready-to-implement, form and examined by means of computer simulations.
暂无评论