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2015 IEEE Biomedical Circuits and Systems Conference (BioCAS)最新文献

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Noise-immune current-integration-based CMOS amperometric sensor platform with 1.2 μm × 2.05 μm electroless-plated microelectrode array for robust bacteria counting 基于1.2 μm × 2.05 μm化学镀微电极阵列的抗噪声电流集成CMOS安培传感器平台,用于稳健的细菌计数
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348420
Kohei Gamo, K. Niitsu, K. Nakazato
A noise-immune current-integration-based CMOS amperometric sensor platform with a bacteria-sized (1.2 μm × 2.05 μm) Au electroless-plated microelectrode array for robust bacteria counting is presented. For robust bacteria counting with sufficient signal-to-noise ratio (SNR), noise must be reduced because the bacteria-sized microelectrode surrounded by a wall can handle only small current (on the order of 100 pA). This is the first platform to employ a current integrator in conjunction with a bacteria-sized microelectrode array. As a result of the proposed current integration, noise associated with drift and the CMOS sensor array can be reduced. To verify the effectiveness of the proposed approach, a test chip was fabricated using 0.6 μm standard CMOS technology. Measurement results demonstrate successful high-sensitivity 2D direct counting of microbeads (1 μm diameter) with 27 dB SNR at 5-ms integration time.
提出了一种基于噪声免疫电流集成的CMOS安培传感器平台,该平台具有细菌尺寸(1.2 μm × 2.05 μm)的Au化学镀微电极阵列,用于稳健的细菌计数。对于具有足够信噪比(SNR)的稳健细菌计数,必须降低噪声,因为被壁包围的细菌大小的微电极只能处理小电流(约100 pA)。这是第一个将电流积分器与细菌大小的微电极阵列结合使用的平台。由于所提出的电流集成,与漂移和CMOS传感器阵列相关的噪声可以减少。为了验证该方法的有效性,采用0.6 μm标准CMOS工艺制作了测试芯片。测量结果表明,在5 ms的积分时间内,微珠(1 μm直径)的二维直接计数成功,信噪比为27 dB。
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引用次数: 15
Computational prediction of competitive endogenous RNA 竞争性内源性RNA的计算预测
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348381
Seunghyun Park, Soowon Kang, Hyeyoung Min, Sungroh Yoon
MicroRNAs (miRNAs) play an important role in the post-transcriptional regulation of gene expression by pairing target messenger RNAs (mRNAs). As the abnormal expression of miRNAs has been implicated in various diseases, there has been many studies on regulating the expression level of miRNA, including “miRNA sponges.” miRNA sponges, which are artificial miRNA decoys, contain complementary binding sites to a target miRNA and regulate the expression level of target miRNAs. As competitive endogenous RNAs (ceRNAs) have been found in a recent study, there have been many efforts to find natural miRNA sponges. However, there are no related studies about the computational approach using the pairwise interactions of numerous mRNA-miRNA pairs. In this study, a computational approach to find candidates of natural miRNA sponges is proposed. Whole miRNA binding sites with query miRNA and the secondary structures of reference mRNA are predicted, followed by calulating the adjusted minimum free energy (AMFE) as the total score. We can quantitatively compare the interactions between miRNAs and target mRNAs by using this proposed approach. Thirty viral miRNAs and about 300 of thousands of human mRNAs are used in this study. As a results, the top 20 natural miRNA sponge candidates are recorded. The results are expected to provide appropriate knowledge before in vivo experiments to validate the identification of miRNA sponges.
MicroRNAs (miRNAs)通过配对靶信使rna (mrna)在基因表达的转录后调控中发挥重要作用。由于miRNA的异常表达与多种疾病有关,因此有很多关于调节miRNA表达水平的研究,包括“miRNA海绵”。“miRNA海绵是一种人工miRNA诱饵,含有与目标miRNA的互补结合位点,并调节目标miRNA的表达水平。随着竞争性内源性rna (ceRNAs)在最近的研究中被发现,人们已经努力寻找天然的miRNA海绵。然而,利用大量mRNA-miRNA对的成对相互作用计算方法尚无相关研究。在本研究中,提出了一种寻找天然miRNA海绵候选物的计算方法。预测具有查询miRNA和参考mRNA二级结构的全miRNA结合位点,然后计算调整后的最小自由能(AMFE)作为总分。通过使用这种方法,我们可以定量地比较mirna和靶mrna之间的相互作用。在这项研究中使用了30种病毒mirna和大约30万种人类mrna。结果,记录了前20个天然miRNA海绵候选物。这些结果有望在体内实验验证miRNA海绵的鉴定之前提供适当的知识。
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引用次数: 0
Biocompatible packagings for fully implantable multi-panel devices for remote monitoring of metabolism 用于远程监测新陈代谢的可完全植入的多面板装置的生物相容性包装
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348398
C. Baj-Rossi, A. Cavallini, T. R. Jost, M. Proietti, F. Grassi, G. Micheli, S. Carrara
This paper compares three different biocompatible packaging covers suitable to support full implantation of multi-panel sensors for remote monitoring of metabolism. The three covers have been designed, realized and implanted in mice for 30 days. ATP and neutrophil concentrations have been measured at the implant site after the device was explanted, to assess the level of biocompatibility of the device.
本文比较了三种不同的生物相容性包装盖,适合于支持多面板传感器的完全植入,用于远程监测代谢。这三个盖子已经被设计、实现并植入老鼠体内30天。在装置外植后,在植入部位测量ATP和中性粒细胞浓度,以评估装置的生物相容性水平。
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引用次数: 2
Application of random forest classifier for automatic sleep spindle detection 随机森林分类器在睡眠纺锤波自动检测中的应用
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348373
C. Patti, S. Shahrbabaki, Chamila Dissanayaka, D. Cvetkovic
Sleep spindle detection using supervised learning methods such as Artificial Neural Networks and Support Vector Machines had been researched in the past. Supervised learning methods such as the above are prone to overfitting problems. In this research paper, we explore the detection of sleep spindles using the Random Forest classifier which is known to over fit data to a much lower extent when compared to other supervised classifiers. The classifier was developed using data from 3 subjects and it was tested on data from 12 subjects from the MASS database. A sensitivity of 71.2% and a specificity of 96.73% was achieved using the random forest classifier.
利用人工神经网络和支持向量机等监督学习方法进行睡眠纺锤波检测已有研究。诸如上述的监督学习方法容易出现过拟合问题。在这篇研究论文中,我们探索了使用随机森林分类器来检测睡眠纺锤波,与其他监督分类器相比,随机森林分类器的数据过拟合程度要低得多。该分类器使用来自3个受试者的数据开发,并对来自MASS数据库的12个受试者的数据进行了测试。随机森林分类器的灵敏度为71.2%,特异性为96.73%。
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引用次数: 14
Live demonstration: A smart homecage system with behavior analysis and closed-loop optogenetic stimulation capacibilities 现场演示:具有行为分析和闭环光遗传刺激能力的智能家居系统
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348331
Y. Jia, Zheyuan Wang, S. Mirbozorgi, Maysam Ghovanloo
In this live demonstration, we present a smart homecage system, called the Enercage-HC, with closed-loop wireless power transmission, wireless communication, and automated tracking and behavior recognition capabilities. Wireless power is delivered in near-field at 13.56 MHz in the FCC-approved ISM-band through an array of coils designed to provide the entire homecage with homogeneous magnetic field. Bidirectional data transmission is accomplished at 2.4 GHz via Bluetooth Low Energy (BLE) for communication with sensors and stimulators attached to or implanted in the animal body. A dual-mode 2D/3D imaging system based on Microsoft Kinect® is used for animal subject tracking and behavioral analysis.
在这个现场演示中,我们展示了一个智能家居系统,称为Enercage-HC,具有闭环无线电力传输,无线通信以及自动跟踪和行为识别功能。无线电源在fcc批准的ism频段13.56 MHz的近场传输,通过一系列线圈为整个住宅提供均匀的磁场。通过低功耗蓝牙(BLE)实现2.4 GHz的双向数据传输,用于与附着或植入动物体内的传感器和刺激器通信。基于Microsoft Kinect®的双模2D/3D成像系统用于动物受试者跟踪和行为分析。
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引用次数: 0
A hardware approach to protein identification 一种蛋白质鉴定的硬件方法
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348382
G. Bianchi, Fabiola Casasopra, Gianluca Durelli, M. Santambrogio
At the basis of proteins identification we have a string matching algorithm, which has a computational complexity that scales with the length of both the searched and the reference string. This complexity, as well as the fact that to match a single protein we need multiple search of different string in the whole database, makes the protein identification a computational intensive task taking tens of seconds to complete. When performing this task with General Purpose Processors (GPPs), as it might be in a large scale installation (such as medical or research centers), this long execution time translates into a high energy requirement which greatly impacts the scalability and maintenance cost of the system. This paper illustrates a possible way to exploit Field Programmable Gate Arrays (FPGAs) to implement a string matching algorithm with an higher energy efficiency, up to 6 times better, than a standard GPP; such solution can be a building block for large-scale installations aimed at improving protein identification.
在蛋白质识别的基础上,我们有一个字符串匹配算法,它的计算复杂度随搜索字符串和参考字符串的长度而变化。这种复杂性,以及为了匹配单个蛋白质我们需要在整个数据库中对不同字符串进行多次搜索的事实,使得蛋白质识别成为一项需要数十秒才能完成的计算密集型任务。当使用通用处理器(gpp)执行此任务时,因为它可能在大型安装中(例如医疗或研究中心),这种长时间的执行转换为高能量需求,这极大地影响了系统的可伸缩性和维护成本。本文阐述了一种利用现场可编程门阵列(fpga)实现具有更高能效的字符串匹配算法的可能方法,比标准GPP高6倍;这种解决方案可以成为旨在提高蛋白质鉴定的大规模装置的基础。
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引用次数: 4
Smart trail with camera and inertial measurement unit for intraoperative estimation of hip range of motion in total hip replacement surgery 全髋关节置换术中用于髋关节运动范围估计的带有摄像头和惯性测量单元的智能跟踪
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348383
Shaojie Su, J. Gao, Zhe Cao, Hong Chen, Zhihua Wang
To minimize the risk of prosthetic impingement after total hip replacement (THR), a novel smart trial is proposed for intraoperative estimation of hip range of motion (ROM) in THR surgery. The smart trial is used to examine the stability, range of motions and risk of dislocation during the surgery, relocate hip implants, and finally will be replaced by real implant prosthesis. The smart trial is composed of a customized femoral head trial with a camera and an inertial measurement unit (IMU) inside, and a customized acetabular cup trial with reference patterns printed on the internal surface. A depth estimation algorithm based on images taken by the camera is designed for the detection of critical regions where impingement or dislocation is about to happen, and an extended Kalman filter is designed for the fusion of the data from IMU to acquire better orientation estimation accuracy. This paper is proof of concept with limited validation through an experimental setup. Simulation results show that the root mean square error (RMSE) of the depth estimation is 1mm and that of the orientation estimation is less than 0.05 degree. The hip ROM is displayed in 3-D mode in real time.
为了最大限度地降低全髋关节置换术(THR)后假体撞击的风险,提出了一种新的智能试验,用于THR手术中髋关节活动范围(ROM)的术中估计。智能试验用于检查手术过程中的稳定性,活动范围和脱位风险,重新安置髋关节假体,最后将被真正的假体替换。智能试验装置由内置摄像头和惯性测量单元(IMU)的定制股骨头试验装置和内表面打印参考图案的定制髋臼杯试验装置组成。设计了一种基于相机拍摄图像的深度估计算法,用于检测即将发生碰撞或错位的关键区域,并设计了扩展卡尔曼滤波器,用于融合IMU数据,以获得更好的方向估计精度。本文是通过实验装置进行有限验证的概念证明。仿真结果表明,深度估计的均方根误差(RMSE)为1mm,方向估计的均方根误差小于0.05度。髋关节ROM以三维模式实时显示。
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引用次数: 1
Hardware friendly algorithm for the calculation of phase synchronization between neural signals 神经信号相位同步计算的硬件友好算法
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348347
J. B. Romaine, M. Delgado-Restituto
This paper reports a mathematically simple, hardware efficient algorithm for use in the detection of epileptic seizures via an approximation of synchronization between two neural EEG signals. The algorithm assumes that the signals are pre-filtered into a desired narrow band, spanning only several 10's of Hz. Using this narrow band it is possible to collect the discrete time stamps, which are represented as the number of samples between two consecutive minimum within a given signal. The difference between a discrete time stamp in one signal and in another, at a given period in time gives an indication as to the amount of frequency difference between the two signals. Once these differences are accumulated, it provides an estimate as to when large increases and decrease in frequency happen in the two signals, with respect to one another.
本文报告了一种数学上简单,硬件效率高的算法,用于通过两个神经脑电图信号之间的近似同步来检测癫痫发作。该算法假设信号被预滤波到一个期望的窄带,仅跨越几个10赫兹。使用这个窄带可以收集离散时间戳,它表示为给定信号中两个连续最小值之间的样本数。在给定的时间内,一个信号和另一个信号的离散时间戳之间的差异表明了这两个信号之间的频率差异的大小。一旦这些差异累积起来,它就提供了一个关于两个信号中频率何时大幅增加和减少的估计,相对于彼此。
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引用次数: 2
Ultra-high resolution millimeter-wave imaging for biomedical applications: Feasibility study 生物医学应用的超高分辨率毫米波成像:可行性研究
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348449
Amir Mirbeik, Negar Tavassolian
This article numerically verifies ultra-high-resolution confocal millimeter-wave imaging for biomedical applications for the first time. A system with an ultra-wide bandwidth of more than 85 GHz is proposed to provide the ultra-high resolutions required for biomedical imaging applications. The feasibility of detecting early-stage tumors in three dimensions is shown using realistic numerical phantoms. A suitable image formation algorithm is developed and applied to the data. Successful resolution of spherical tumors is achieved in the obtained images both axially and laterally.
本文首次对超高分辨率共焦毫米波成像在生物医学领域的应用进行了数值验证。提出了一种超过85 GHz的超宽带系统,以提供生物医学成像应用所需的超高分辨率。利用逼真的数值模拟显示了三维检测早期肿瘤的可行性。提出了一种合适的图像生成算法,并将其应用于该数据。所获得的图像在轴向和横向上都能成功地分辨球形肿瘤。
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引用次数: 6
Pediatric epilepsy: Clustering by functional connectivity using phase synchronization 儿童癫痫:使用相同步的功能连接聚类
Pub Date : 2015-12-07 DOI: 10.1109/BioCAS.2015.7348368
H. Rajaei, M. Cabrerizo, S. Sargolzaei, Alberto Pinzon-Ardila, S. Gonzalez-Arias, M. Adjouadi
This study proposes a nonlinear data-driven method to delineate Electroencephalogram (EEG) recordings as either coming from controls or patients with epilepsy. This method uses the probability of recurrence and the correlation between electrodes to extract the phase synchronization and the functional connectivity maps of the brain from interictal EEG data recordings. This newly proposed algorithm utilizes probabilistic clustering by extracting graph theoretical features from the calculated functional connectivity matrices. Results reveal that brain connectivity networks of epileptic and control populations show statistically significant differences (t (340) = -37.4771, p<;0.01) between them. Performance results show an accuracy of 92.8% with a sensitivity of 85.7% and a specificity of 100%, when tested on 14 subjects. These preliminary results confirm that this method can be used to enhance and validate diagnosis of epileptic patients from controls using non-invasive scalp EEG signals.
本研究提出了一种非线性数据驱动的方法来描述脑电图(EEG)记录,无论是来自对照组还是癫痫患者。该方法利用重复概率和电极间的相关性,从间歇期脑电数据记录中提取脑相同步和功能连接图。该算法利用概率聚类方法,从计算的功能连通性矩阵中提取图理论特征。结果显示,癫痫人群与对照组脑连接网络差异有统计学意义(t (340) = -37.4771, p<;0.01)。性能结果表明,在14个受试者中,准确率为92.8%,灵敏度为85.7%,特异性为100%。这些初步结果证实,该方法可用于增强和验证非侵入性头皮脑电图信号对癫痫患者的诊断。
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引用次数: 9
期刊
2015 IEEE Biomedical Circuits and Systems Conference (BioCAS)
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