Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)最新文献_第9页

Is random tracking more difficult in two dimensions than one dimension? 在二维中随机跟踪是否比在一维中更难?

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.744777

R. Jones, R. W. Watson

{"title":"Is random tracking more difficult in two dimensions than one dimension?","authors":"R. Jones, R. W. Watson","doi":"10.1109/IEMBS.1998.744777","DOIUrl":"https://doi.org/10.1109/IEMBS.1998.744777","url":null,"abstract":"There is conflicting evidence in the literature as to whether sensory-motor performance degrades on going from a 1D to a 2D task. We undertook a study to investigate more closely the fundamental questions: Is random tracking more difficult in 2D than in 1D? If so, is the increased difficulty due to the increased velocity or the increased dimensionality of the 2D task? The study involved 16 normal subjects tracking 2D random targets and two orthogonal 1D equivalents using a floor-mounted joystick. To investigate the speed versus dimensionality question, a version of the standard 2D task was devised which used a scaled target signal with the same average velocity and displacement as the 1D task. Tracking performance (mean absolute error) was found to degrade by 41% (p<.001) on going from the 1D to the scaled 2D task, This demonstrates that tracking is indeed more demanding in 2D than 1D and that this can be unequivocally attributed to the increased dimensionality of the 2D task. Most of the poorer performance on the 2D task could be attributed to an extra 59 ms in tracking delay and is considered most likely due to the extra degree of freedom reducing the ability of the sensory-motor system to offset inherent delays in the system by using prediction.","PeriodicalId":156581,"journal":{"name":"Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124362529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On modeling impulsive bioacoustic signals with symmetric /spl alpha/-stable distributions: application in discontinuous adventitious lung sounds and explosive bowel sounds 对称/声压α /稳定分布的脉冲生物声学信号建模:在不连续的不定式肺音和爆发性肠音中的应用

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.745810

L. Hadjileontiadis, S. Panas

引用次数: 7

Retrieval of the small intestinal pressure from time-frequency analysis of the electroenterogram 从肠电图时频分析中提取小肠压力

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.747172

J. L. Martinez-de-Juan, F.J. Saiz, J. L. Ponce, M. Meseguer, S. Sancho-Fornos

{"title":"Retrieval of the small intestinal pressure from time-frequency analysis of the electroenterogram","authors":"J. L. Martinez-de-Juan, F.J. Saiz, J. L. Ponce, M. Meseguer, S. Sancho-Fornos","doi":"10.1109/IEMBS.1998.747172","DOIUrl":"https://doi.org/10.1109/IEMBS.1998.747172","url":null,"abstract":"The aim of this work is to analyse the electrical signal from the serosa of the small bowel in the time-frequency (t-f) plane. This signal is named the electroenterogram, and it is the result of a slow wave (SW) and a spike burst (SE). Only the latter represents intestinal pressure, but SW gives the maximum rhythm of the contractions. Three joint records of electroenterogram and intestinal wall contractions were carried out (duodenum, angle of Treitz and jejunum) on two dogs. Each record is 4 hours long. Six t-f distributions were calculated over a 1 minute period of the electroenterogram: Wigner-Ville (WVD), Choi-Williams (CWD), Zhao-Atlas-Marks (ZAM), and 3 spectrograms with different window lengths. CWD is the best distribution for graphical displaying in order to recognise the electrical signal of the small bowel. However, spectrograms are better than CWD for obtaining the time marginal and the local mean frequency. Both temporal functions are highly correlated with intestinal pressure.","PeriodicalId":156581,"journal":{"name":"Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)","volume":"51 9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124535197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Stretch reflex contribution to soleus activation during spastic gait 痉挛步态中拉伸反射对比目鱼肌激活的贡献

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.744758

Peter Veltink, Michel Ladouceur, T. Sinkjær

引用次数: 4

Using EMG to evaluate muscle functions in patients with low back pain (LBP) syndromes 用肌电图评估腰痛综合征患者的肌肉功能

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.745174

W. Lu, K. Luk, K. Cheung, J. Leong

引用次数: 2

EMG activity and knee joint torque evoked by microstimulation of the cat L6 spinal cord 猫L6脊髓微刺激引起的肌电图活动和膝关节扭矩

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.744978

C. Tai, A. M. Booth, C. Robinson, W. D. de Groat, J. Roppolo

{"title":"EMG activity and knee joint torque evoked by microstimulation of the cat L6 spinal cord","authors":"C. Tai, A. M. Booth, C. Robinson, W. D. de Groat, J. Roppolo","doi":"10.1109/IEMBS.1998.744978","DOIUrl":"https://doi.org/10.1109/IEMBS.1998.744978","url":null,"abstract":"The knee extensor and flexor EMG activity evoked by microstimulation of the cat L6 spinal cord were recorded while simultaneously monitoring the knee joint extension and flexion torques. Single fine-tipped (200 to 400 /spl mu/m/sup 2/ surface area) activated iridium microelectrode was implanted in the left side of the L6 spinal cord. Large extension torque was produced by microstimulation in the ventral horn and small flexion torque was produced by microstimulation in the dorsal horn. The extensor EMG was much larger than the flexor EMG when large extension torque was produced. The flexor EMG was just slightly larger than the extensor EMG and both were small when small flexion torque was produced. When extension torque was generated, the extensor EMG increased rapidly with increasing stimulus intensity while the flexor EMG remained at almost the same level. These results showed that the L6 spinal cord of the cat is more effective in generating extension torque than flexion torque and that hindlimb flexor and extensor EMG is correlated with torque. Microstimulation of the spinal cord is a potential method to restore the low limb function for patients with spinal cord injuries.","PeriodicalId":156581,"journal":{"name":"Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127789905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Short-term forecasting of life-threatening arrhythmias with finite time Lyapunov exponents 有限时间李雅普诺夫指数对危及生命的心律失常的短期预测

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.745908

N. Wessel, U. Meyerfeldt, A. Schirdewan, J. Kurths, A. Voss

{"title":"Short-term forecasting of life-threatening arrhythmias with finite time Lyapunov exponents","authors":"N. Wessel, U. Meyerfeldt, A. Schirdewan, J. Kurths, A. Voss","doi":"10.1109/IEMBS.1998.745908","DOIUrl":"https://doi.org/10.1109/IEMBS.1998.745908","url":null,"abstract":"Ventricular tachycardia or fibrillation (VT/VF) are fatal cardiac arrhythmias which are the main triggering factors for a sudden cardiac death. The objective of this study was to find early signs of VT/VF in patients with an implantable cardioverter-defibrillator (ICD) to enable a prediction for an improved antiarrhythmic therapy. Therefore, we studied the interbeat intervals of 17 chronic heart failure ICD patients with and without (control) VT/VF event. To detect typical signs of an immediately following malignant arrhythmia we calculated HRV parameters from time and frequency domain as well as the averaged finite time Lyapunov exponent and the Shannon entropy of the finite time Lyapunov exponents distribution. The results of this study show that neither the time nor the frequency domain parameters show significant differences between the VT/VF and the control time series. However, the averaged finite time Lyapunov exponents and the Shannon entropy discriminate significantly both groups (p<0.01 resp. p<0.04). These findings could be of importance in algorithms for next generation ICDs to improve the diagnostics and therapy of VT/VF.","PeriodicalId":156581,"journal":{"name":"Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127834193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

An improved phonocardiographic method for fetal heart rate monitoring 一种用于胎儿心率监测的改进心音图方法

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.746915

F. Kovács, M. Tõrõk

引用次数: 11

Using neural network with virtual sensors to generate optimum FES gait controllers 利用神经网络和虚拟传感器生成最优FES步态控制器

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.744984

K. Tong, M. Granat

{"title":"Using neural network with virtual sensors to generate optimum FES gait controllers","authors":"K. Tong, M. Granat","doi":"10.1109/IEMBS.1998.744984","DOIUrl":"https://doi.org/10.1109/IEMBS.1998.744984","url":null,"abstract":"In Functional Electrical Stimulation (FES) control systems, artificial intelligence has been employed for feedback or adaptive control to assist paraplegic walking. Neural networks with a three-layer structure can be used to generate control replacing the manual control to deliver the stimulation during walking. Sensors which have been used to provide information for the controller range in complexity from simple heel or hand switches to accelerometers. There are three basic problems connected with the selection of sensors: sensor types, number of sensors and the optimum location on the limb. Kinematic signals can be simulated from 3D data collected from a motion analysis system. These 'virtual' sensors (goniometers, gyroscopes, inclinometers and accelerometers) showed a good correlation with their physical counterparts. The aim of this study was to use neural network to generate optimum FES controllers. 32 sensors ('virtual' kinematic sensors and physical sensors recording crutch forces and foot floor contacts) were used to find an optimum sensor set. The results have shown that neural networks with a small optimum sensor set could produce a robust controller with a higher degree of accuracy than a traditional heel switch controller. After few months, the controller still maintained a high accuracy.","PeriodicalId":156581,"journal":{"name":"Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126227876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Culture and the deployment of health care telematics applications 文化和卫生保健远程信息处理应用的部署

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-10-29 DOI: 10.1109/IEMBS.1998.747098

M. Demeester, S. Guillen-Barrionuevo, J. Millet-Roig, V. Traver, A. Mocholí-Salcedo

引用次数: 2