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2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)最新文献

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Estimation of spectral parameters of nonstationary HRV signals using Gaussian fitting spectra 高斯拟合非平稳HRV信号的谱参数估计
M. Daoud, P. Ravier, M. Jabloun, B. Yagoubi, O. Buttelli
The heart rate variability (HRV) spectral parameters are classically used for studying the autonomic nervous system, as they allow the evaluation of the balance between the sympathetic and parasympathetic influences on heart rhythm. However, this evaluation is based on the definition of frequency bands that are found to be controversial because of possible changes in the frequency boundaries due to physiological factors or experimental conditions. We propose to overcome this difficulty by dynamically modelling the power spectrum as a two Gaussian shapes mixture. It appeared that this procedure was able to more accurately follow the exact parameters in the case of simulated data, in comparison with parameters estimation obtained with a rigid frequency cutting approach or with the ITSB algorithm [1]. Real data results obtained on a classical stand-test are also presented and discussed.
心率变异性(HRV)频谱参数通常用于研究自主神经系统,因为它们可以评估交感神经和副交感神经对心律的影响之间的平衡。然而,这种评价是基于频带的定义,由于生理因素或实验条件可能导致频率边界发生变化,因此发现频带的定义存在争议。我们建议通过将功率谱动态建模为两个高斯形状的混合物来克服这一困难。与刚性频率切割方法或ITSB算法[1]获得的参数估计相比,该程序似乎能够更准确地跟踪模拟数据的确切参数。本文还介绍并讨论了在经典台架试验中获得的实际数据结果。
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引用次数: 2
Multiservice temedicine application over an emulated DVB-RCS satellite link 模拟DVB-RCS卫星链路上的多业务医疗应用
L. Bianchi, M. Luglio, M. Marciani, F. Zampognaro
To exchange medical data between two distant locations is of paramount importance in a significant number of scenarios (emergency, developing countries, home care, training, etc.). This paper presents performance evaluation, through emulation and using real medical equipment, of a Telemedicine application including Electro-encephalographic (EEG) data, audio, video and text. All the application flows will be routed through an IP-based network emulator, which introduces the same effects of the transmission over a real satellite link, including a satellite segment which adopts the ETSI standard DVB-RCS EN301–790. The Telemedicine application aims to support a typical clinical exam, commonly used for the diagnosis of several neurological disorders, but with the neurologist located in a different place with respect to the patient. The paper describes in particular the setup and technical issues in case the application is used over a satellite network. Feasibility and performance evaluation, checked by the neurologist, are carried out using a DVB-RCS emulated environment (called SNEP), providing some remarks on the setup and comments on the obtained results.
在许多情况下(紧急情况、发展中国家、家庭护理、培训等),在两个相距遥远的地点之间交换医疗数据至关重要。本文通过仿真和实际医疗设备对一个远程医疗应用程序进行了性能评估,包括脑电图数据、音频、视频和文本。所有的应用程序流都将通过一个基于ip的网络模拟器进行路由,该模拟器引入了在真实卫星链路上传输的相同效果,包括采用ETSI标准DVB-RCS EN301-790的卫星段。远程医疗应用程序旨在支持典型的临床检查,通常用于几种神经系统疾病的诊断,但神经学家位于与患者不同的地方。本文特别介绍了在卫星网络上使用该应用程序的设置和技术问题。可行性和性能评估,由神经科医生检查,使用DVB-RCS模拟环境(称为SNEP)进行,对设置和获得的结果提供一些评论。
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引用次数: 3
Non-line-of-sight error mitigation for range estimation in dynamic environments 动态环境下距离估计的非视距误差缓解
Qinghua Wang, I. Balasingham
Localization is an important component in many applications such as the promising Ultra-Wideband (UWB) wireless sensor network for medical treatment. For the majority of localization technologies, it is essential to measure the ranges between a target and several reference nodes before the target can be localized. Existing range estimation techniques rely on the measurements of time-of-arrival (TOA) and received-signal-strength (RSS) which suffer from environmental change. Dynamic environment such as human mobility can cause non-line-of-sight (NLOS) measurements which will significantly degrade the accuracy of range estimation. Therefore, range estimation methods are desired to be robust to NLOS measurements. In this paper, it is proposed to use hypothesis tests to identify whether there are NLOS measurements mixed in with the measurement dataset. For those NLOS corrupted measurement datasets, a new range estimation method based on a Log-normal model is found to be capable of reducing the range estimation error. Another advantage of this new range estimation method is that NLOS measurements are not required to be excluded from its analysis. However, simulation results show that the range estimation accuracy can be further improved if NLOS measurements are excluded.
定位是许多应用的重要组成部分,例如用于医疗的超宽带(UWB)无线传感器网络。对于大多数定位技术来说,在定位目标之前,必须测量目标与多个参考节点之间的距离。现有的距离估计技术依赖于对到达时间(TOA)和接收信号强度(RSS)的测量,这些测量会受到环境变化的影响。动态环境如人的移动会导致非视距(NLOS)测量,这将大大降低距离估计的准确性。因此,距离估计方法需要对NLOS测量具有鲁棒性。本文提出使用假设检验来识别是否有NLOS测量数据混入测量数据集。针对NLOS损坏的测量数据集,提出了一种新的基于对数正态模型的距离估计方法,可以减小距离估计误差。这种新的距离估计方法的另一个优点是不需要将NLOS测量排除在其分析之外。然而,仿真结果表明,如果排除NLOS测量,距离估计精度可以进一步提高。
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引用次数: 2
Malignant tissue phantom dielectric properties investigation at microwave frequencies 微波频率下恶性组织幻相介电特性研究
D. Faktorova
Microwave techniques for biomedical applications aimed at cancer treatment or diagnosis, either by imaging or spectroscopy, are promising. Their use relies on knowledge of the dielectric properties of tissues, especially on a detectable difference between malignant and normal tissues. As most studies investigated the dielectric properties of ex vivo tissues, there is a need for better biophysical understanding of human tissues in their living state [1]. The paper deals with investigation of dielectric qualities of pure glucose, glucose in solutions like phantoms of biological tissues directing the attention at its manifestation at carcinoma cells investigation by means of microwaves. Simple and well-known theoretical formulas are used for unambiguous determination of complex permittivity. Experimental results from these investigations are given and their evaluation is presented.
微波技术在生物医学上的应用,无论是通过成像还是光谱,都是很有前途的,目的是治疗或诊断癌症。它们的使用依赖于对组织介电特性的了解,特别是对恶性组织和正常组织之间可检测到的差异的了解。由于大多数研究都是研究离体组织的介电特性,因此有必要更好地了解人体组织在其生活状态下的生物物理学。本文研究了纯葡萄糖的介电性质,研究了葡萄糖在生物组织中像幽灵一样的溶液中的介电性质,并将重点放在微波对癌细胞的研究上。简单和众所周知的理论公式用于明确地确定复介电常数。给出了这些研究的实验结果,并对其进行了评价。
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引用次数: 2
Outage probability of alamouti based cooperative communications with multiple relay nodes using network coding 基于alamouti的多中继节点协同通信的网络编码中断概率
G. Das Menghwar, C. Mecklenbrauker
In this paper, we extend our proposed scheme of cooperative communications based on Alamouti scheme which was aided by a single relay node to forward network coded bits to the destination. In this work, instead of a single relay node, we consider multiple relays forwarding network coded bits, of the information received from the cooperating users, to the destination. With analytical results on the outage probability, we show that the cooperative diversity gain of the proposed scheme increases linearly with m, the number of relay nodes assisting cooperating users by forwarding network coded bits of their information to the destination.
在本文中,我们扩展了基于Alamouti方案的协作通信方案,该方案利用单个中继节点将网络编码位转发到目的地。在这项工作中,我们考虑多个中继将从合作用户接收到的信息的网络编码位转发到目的地,而不是单个中继节点。通过对中断概率的分析结果表明,该方案的合作分集增益随中继节点数m线性增加,中继节点通过将合作用户的网络编码信息转发到目的地来协助合作用户。
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引用次数: 4
Impact of the time segment analysis for P300 detection with spatial filtering 时间片段分析对空间滤波P300检测的影响
H. Cecotti, R. Phlypo, B. Rivet, M. Congedo, E. Maby, J. Mattout
A Brain-Computer Interface (BCI) allows the direct communication between humans and computers by analyzing brain activity. The oddball paradigm allows detecting event-related potentials (ERPs), like the P300 wave, on targets selected by the user. While this paradigm provides the location of the P300 wave in the signal, its exact location remains a hypothesis and depends on the subject. This paper deals with the choice of the time segment for the signal analysis and its impact on the classification. A method for selecting the relevant part of the signal that contains the P300 wave is proposed. First, spatial filters are estimated for enhancing the signal. Second, a part of the enhanced P300 wave is selected based on its magnitude. This selection aims at providing an optimal start for the time window representing the P300 wave. Three window lengths are compared. We show that a window length of 500ms provides on average the best results, but the optimal window length should be set individually. The proposed technique has been validated on data recorded on 20 healthy subjects.
脑机接口(BCI)通过分析大脑活动,实现人与计算机之间的直接交流。奇球范式允许在用户选择的目标上检测事件相关电位(erp),如P300波。虽然这个范例提供了信号中P300波的位置,但它的确切位置仍然是一个假设,取决于受试者。本文讨论了信号分析时段的选择及其对分类的影响。提出了一种选择包含P300波的信号相关部分的方法。首先,估计空间滤波器来增强信号。其次,根据增强的P300波的幅度选择一部分增强的P300波。这个选择的目的是为代表P300波的时间窗口提供一个最佳的开始。比较了三个窗口的长度。我们表明,平均而言,500毫秒的窗口长度提供了最好的结果,但最佳窗口长度应该单独设置。该技术已在20名健康受试者的数据记录上得到验证。
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引用次数: 6
New sequence alignment by a measure due to entangled correlation in two consecutive residues 基于两个连续残基纠缠相关的一种测量方法的新序列比对
Toshihide Hara, Keiko Sato, M. Ohya
We develop a new sequence alignment called MTRAP by introducing a measure due to entangled correlation in two consecutive residues. We showed that the alignment accuracy could be improved by our approach. In the benchmark test by PREFAB 4.0, our method achieves the highest ranking compared with other methods such as ClustalW2, TCoffee and MAFFT.
我们通过在两个连续残基中引入纠缠相关的测量,开发了一种新的序列比对方法,称为MTRAP。结果表明,该方法可以提高对准精度。在PREFAB 4.0的基准测试中,我们的方法与ClustalW2、TCoffee、MAFFT等方法相比,获得了最高的排名。
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引用次数: 1
DC power system for Radio Base Station by renewables energy sources 可再生能源无线基站直流供电系统
Pere Sabater, A. Moià, R. Prasad
The remarkable growing of the energy consumption from fossil fuels and the gases given off by them to the atmosphere promoting the greenhouse effect, has risen exponentially. In the last two years it has experienced an insignificant fall due to the financial crisis in several economic sectors. Moreover, it there had been a launching in the production of electric power from renewable energy sources, most of all wind energy and photovoltaic energy. Pressures from the public community as well as campaigns from respective governments and national and international institutions such as: Kyoto commitment promoting energy efficiency as a result of a decrease in the stores of primary energy and the perception of the climate change requires to set the target 20 20 20 up, in other words for next year 2020 to reduce by 20% the emission of CO2 and to generate by 20% of the produced electric power in renewable energy sources. Otherwise, in the telecommunication industry, the third economy in the world which is not free to these facts, the subscription's demands into mobile phone services and broadband connections are increasing exponentially. The main important energy source consumed by telecommunication operators is electric. Nevertheless, it has been proved that the energy consumption from a usual network of a mobile network operator varies between 1,5 TWh and 9TWh [7] per year, and nowadays it is estimated that the telecommunication's industry consumes about 1% of the global energy consume of the planet.
化石燃料的能源消耗和它们向大气中排放的促进温室效应的气体的显著增长呈指数级增长。在过去的两年里,由于几个经济部门的金融危机,它经历了一个微不足道的下降。此外,如果已经开始利用可再生能源,主要是风能和光伏能源生产电力。压力从公共社区以及运动从各自的政府和国家和国际机构如:《京都议定书》承诺提高能源效率的结果减少商店的主要能源和气候变化的感知需要设置目标20 20 20,换句话说明年2020年减少20%二氧化碳的排放和生成20%的可再生能源产生的电力。否则,在电信行业,世界第三经济,这是不自由的这些事实,用户对移动电话服务和宽带连接的需求呈指数级增长。电信运营商消耗的主要能源是电力。然而,事实证明,移动网络运营商的普通网络每年的能耗在1.5太瓦时至9太瓦时之间[7],目前据估计,电信行业消耗的能源约占全球能源消耗的1%。
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引用次数: 1
Synchronization of inhibitory pulse-coupled oscillators in delayed random and line networks 延迟随机和线性网络中抑制脉冲耦合振荡器的同步
Johannes Klinglmayr, C. Bettstetter
In a system of pulse-coupled oscillators with delays, inhibitory coupling assures synchronization and convergence if the oscillators are fully connected. This paper investigates inhibitory coupling in non-fully-connected networks by means of simulation. First, we show that an existing inhibitory coupling scheme does not perform well in random networks. Second, we propose a simple modification, which tends to improve the synchronizing behavior of inhibitory coupling.
在具有时滞的脉冲耦合振子系统中,抑制耦合保证了振子完全连接时的同步和收敛性。本文通过仿真研究了非完全连接网络中的抑制耦合问题。首先,我们证明了现有的抑制耦合方案在随机网络中表现不佳。其次,我们提出了一个简单的修改,它倾向于改善抑制耦合的同步行为。
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引用次数: 8
Admission and power control for cognitive radio cellular networks: A multidimensional knapsack solution 认知无线蜂窝网络的准入和功率控制:多维背包解决方案
J. Xiang, Yan Zhang, T. Skeie
Admission and power control schemes play important roles in deploying cognitive radio technology to cellular networks. In this paper, we propose a method to calculate the power scale factor, introduce two pre-admission control schemes, and reformulate the problem as a multidimensional knapsack problem. In addition, we propose a novel admission and power control scheme called JAPC-MKP. Simulation results show that our proposed JAPC-MKP can very closely approach the optimal results from the optimization software MOSEK, and greatly outperform the existing schemes in most cases.
在蜂窝网络中部署认知无线电技术时,接纳和功率控制方案起着重要作用。在本文中,我们提出了一种计算功率比例因子的方法,引入了两种预接纳控制方案,并将该问题重新表述为一个多维背包问题。此外,我们还提出了一种新的准入和功率控制方案,称为JAPC-MKP。仿真结果表明,本文提出的JAPC-MKP算法可以非常接近优化软件MOSEK的最优结果,并且在大多数情况下都大大优于现有方案。
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引用次数: 3
期刊
2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)
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