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Dimensionality reduction

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https://www.readbyqxmd.com/read/28231004/ionic-intercalation-in-2d-van-der-waals-materials-in-situ-characterization-and-electrochemical-control-of-the-anisotropic-thermal-conductivity-of-black-phosphorus
#1
Joon Sang Kang, Ming Ke, Yongjie Hu
Two-dimensional van der Waals materials have shown novel fundamental properties and promise for wide applications. Here, we reported, for the first time, an experimental demonstration of the in-situ characterization and control of the anisotropic thermal conductivity of black phosphorus. We develop a novel platform based on lithium ion batteries that integrates ultrafast optical spectroscopy and electrochemical control to investigate the interactions between lithium ions and the lattices of the black phosphorus electrode...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28230979/simple-expendable-3d-printed-microfluidic-systems-for-sample-preparation-of-petroleum
#2
Erica Megumi Kataoka, Rui Cesar Murer, Jandyson Machado Santos, Rogerio Mesquita de Carvalho, Marcos Nogueira Eberlin, Fabio Augusto, Ronei Jesus Poppi, Angelo Luiz Gobbi, Leandro Wang Hantao
In this study, we introduce a simple protocol to manufacture disposable, 3D-printed microfluidic systems for sample preparation of petroleum. Such platform is produced with a consumer-grade 3D-printer, using fused deposition modeling. Successful incorporation of solid-phase extraction (SPE) to microchip was ensured by facile 3D element integration using proposed approach. This 3D-printed μSPE device was applied to challenging matrices in oil & gas industry, such as crude oil and oil-brine emulsions. Case studies investigated important limitations of non-silicon and non-glass microchips, namely, resistance to nonpolar solvents and conservation of sample integrity...
February 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28229853/-consideration-of-the-shape-of-the-teeth-in-facial-hyperdivergency
#3
Olivier Sorel, Mohamed Naaim, Pierre-Alexandre Chataigner, Damien Brézulier, Valérie Bertaud
INTRODUCTION: The study examines how the shape of the teeth is taken into account in the context of facial hyperdivergency. One aim was to check out the widely-held belief that the hyperdivergent patient has long teeth. DISCUSSION: Our study found no link between the shape of the teeth and facial hyperdivergency, thus confirming the results in the literature. We examined the issue of how to characterize dental shapes. We found three diversely-appreciated types of shape: rectangular, triangular and ovoid...
March 2017: L' Orthodontie Française
https://www.readbyqxmd.com/read/28227943/an-unsupervised-approach-to-detecting-and-isolating-athletic-movements
#4
Terry Taewoong Um, Dana Kulic, Terry Taewoong Um, Dana Kulic, Dana Kulic
To enable automatic analysis of athletic movement, the first task is to recognize the athletic movements to be analyzed from a continuous motion data stream. Automated detection of athletic movement and the isolation of the recruited body parts would enable the analysis of sporting movements for improving sports performance and preventing possible injuries. In this paper, an unsupervised method for detecting and isolating athletic movements is proposed. Given motion capture data, the method automatically identifies when athletic movements are being performed and the body parts involved using the concepts of the manipulability and kinematic dimensionality reduction...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227855/simultaneous-reconstruction-and-segmentation-with-the-mumford-shah-functional-for-electron-tomography
#5
Li Shen, Eric Todd Quinto, Shiqiang Wang, Ming Jiang, Li Shen, Eric Todd Quinto, Shiqiang Wang, Ming Jiang, Ming Jiang, Eric Todd Quinto, Shiqiang Wang, Li Shen
Electron micrography (EM) is an important method for determining the three-dimensional (3D) structure of macromolecular complexes and biological specimens. But there are several limitations such as poor signal-to-noise, limitation on range of tilt angles and sub-region subject to electron exposure, unintentional movements of the specimen, with EM systems that make the reconstruction procedure a severely ill-posed problem. A different choice of reconstruction method may lead to different results and create different additional artifacts in reconstructed images...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227538/accurate-upper-body-rehabilitation-system-using-kinect
#6
Sanjana Sinha, Brojeshwar Bhowmick, Kingshuk Chakravarty, Aniruddha Sinha, Abhijit Das, Sanjana Sinha, Brojeshwar Bhowmick, Kingshuk Chakravarty, Aniruddha Sinha, Abhijit Das, Abhijit Das, Kingshuk Chakravarty, Brojeshwar Bhowmick, Aniruddha Sinha, Sanjana Sinha
The growing importance of Kinect as a tool for clinical assessment and rehabilitation is due to its portability, low cost and markerless system for human motion capture. However, the accuracy of Kinect in measuring three-dimensional body joint center locations often fails to meet clinical standards of accuracy when compared to marker-based motion capture systems such as Vicon. The length of the body segment connecting any two joints, measured as the distance between three-dimensional Kinect skeleton joint coordinates, has been observed to vary with time...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226822/hidden-markov-factor-analysis-as-a-spatiotemporal-model-for-electrocorticography
#7
Akinyinka Omigbodun, Werner K Doyle, Orrin Devinsky, Daniel Friedman, Thomas Thesen, Vikash Gilja, Akinyinka Omigbodun, Werner K Doyle, Orrin Devinsky, Daniel Friedman, Thomas Thesen, Vikash Gilja, Akinyinka Omigbodun, Thomas Thesen, Vikash Gilja, Werner K Doyle, Orrin Devinsky, Daniel Friedman
We present a new approach to extracting low-dimensional neural trajectories that summarize the electrocorticographic (ECoG) signals recorded with high-channel-count electrode arrays implanted subdurally. In our approach, Hidden-Markov Factor Analysis (HMFA), a finite set of factor analyzers are used to model the relationship between the high-dimensional ECoG neural space and a low-dimensional latent neural space; the factor analyzers at different time points are in turn linked together with a hidden Markov model...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226744/toward-a-severity-index-for-rop-an-unsupervised-approach
#8
Peng Tian, Esra Ataer-Cansizoglu, Jayashree Kalpathy-Cramer, Susan Ostmo, Karyn Jonas, R V Paul Chan, J Peter Campbell, Michael F Chiang, Deniz Erdogmus, Peng Tian, Esra Ataer-Cansizoglu, Jayashree Kalpathy-Cramer, Susan Ostmo, Karyn Jonas, R V Paul Chan, J Peter Campbell, Michael F Chiang, Deniz Erdogmus, Michael F Chiang, Esra Ataer-Cansizoglu, Peng Tian, Deniz Erdogmus, J Peter Campbell, Jayashree Kalpathy-Cramer, R V Paul Chan, Susan Ostmo, Karyn Jonas
Retinopathy of prematurity (ROP) is a disease affecting low birth-weight infants and is the major cause of childhood blindness. Although accurate diagnosis is important, there is a high variability among expert decisions mostly due to subjective thresholds. Existing work focused on automated diagnosis of ROP. In this study, we construct a continuous severity index as an alternative to discrete classification. We follow an unsupervised approach by performing nonlinear dimensionality reduction. Instead of extracting several statistics of image features, each image is represented by the probability distribution of its features...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226638/data-correction-to-determine-a-representative-pattern-of-a-set-of-3d-knee-kinematic-measurements
#9
Imen Mechmeche, Amar Mitiche, Youssef Ouakrim, Jacques A De Guise, Neila Mezghani, Imen Mechmeche, Amar Mitiche, Youssef Ouakrim, Jacques A De Guise, Neila Mezghani, Amar Mitiche, Youssef Ouakrim, Neila Mezghani, Jacques A De Guise, Imen Mechmeche
The purpose of this study is to determine a representative pattern of a set of three dimensional (3D) knee kinematic measurement curves recorded throughout several trials with a patient walking on a treadmill. The measurements are knee angles, (namely joint angles) with respect to the sagittal, frontal, and transverse planes, as a function of time during a gait cycle. Two serious difficulties met while extracting a representative pattern from the trials are that the curves possess phase variability and there are outliers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226631/high-accuracy-user-identification-using-eeg-biometrics
#10
Toshiaki Koike-Akino, Ruhi Mahajan, Tim K Marks, Ye Wang, Shinji Watanabe, Oncel Tuzel, Philip Orlik, Toshiaki Koike-Akino, Ruhi Mahajan, Tim K Marks, Ye Wang, Shinji Watanabe, Oncel Tuzel, Philip Orlik, Ruhi Mahajan, Tim K Marks, Shinji Watanabe, Oncel Tuzel, Ye Wang, Philip Orlik, Toshiaki Koike-Akino
We analyze brain waves acquired through a consumer-grade EEG device to investigate its capabilities for user identification and authentication. First, we show the statistical significance of the P300 component in event-related potential (ERP) data from 14-channel EEGs across 25 subjects. We then apply a variety of machine learning techniques, comparing the user identification performance of various different combinations of a dimensionality reduction technique followed by a classification algorithm. Experimental results show that an identification accuracy of 72% can be achieved using only a single 800 ms ERP epoch...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226626/detection-of-steering-direction-using-eeg-recordings-based-on-sample-entropy-and-time-frequency-analysis
#11
P Caldero-Bardaji, X Longfei, S Jaschke, J Reermann, K G Mideska, G Schmidt, G Deuschl, M Muthuraman, P Caldero-Bardaji, X Longfei, S Jaschke, J Reermann, K G Mideska, G Schmidt, G Deuschl, M Muthuraman, J Reermann, X Longfei, P Caldero-Bardaji, G Deuschl, K G Mideska, S Jaschke, G Schmidt, M Muthuraman
Monitoring driver's intentions beforehand is an ambitious aim, which will bring a huge impact on the society by preventing traffic accidents. Hence, in this preliminary study we recorded high resolution electroencephalography (EEG) from 5 subjects while driving a car under real conditions along with an accelerometer which detects the onset of steering. Two sensor-level analyses, sample entropy and time-frequency analysis, have been implemented to observe the dynamics before the onset of steering. Thus, in order to classify the steering direction we applied a machine learning algorithm consisting of: dimensionality reduction and classification using principal-component-analysis (PCA) and support-vector-machine (SVM), respectively...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226532/sampling-and-recovery-of-mri-data-using-low-rank-tensor-models
#12
Daniel Banco, Shuchin Aeron, W Scott Hoge, Daniel Banco, Shuchin Aeron, W Scott Hoge, Shuchin Aeron, Daniel Banco, W Scott Hoge
In this paper we investigate the utility of several low-rank models for recovery of Magnetic Resonance Imaging (MRI) data from limited sampling in the k - t space for dynamic imaging. In particular, for 3D temporal (2D space + time) MRI data we employ several tensor factorization techniques and assess the degree of dimensionality reduction, or compressibility, that can be obtained. This algebraic approach is more data adaptive, in contrast to existing compressed sensing (CS) based methods that exploit sparsity in a transform domain, such as wavelets or total variation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226504/short-latency-hand-movement-classification-based-on-surface-emg-spectrogram-with-pca
#13
Xiaolong Zhai, Beth Jelfs, Rosa H M Chan, Chung Tin, Xiaolong Zhai, Beth Jelfs, Rosa H M Chan, Chung Tin, Xiaolong Zhai, Rosa H M Chan, Beth Jelfs, Chung Tin
Hand gesture recognition from forearm surface electromyography (sEMG) is an active research field in the development of motor prosthesis. Studies have shown that classification accuracy and efficiency is highly dependent on the features extracted from the EMG. In this paper, we show that EMG spectrograms are a particularly effective feature for discriminating multiple classes of hand gesture when subjected to principal component analysis for dimensionality reduction. We tested our method on the Ninapro database which includes sEMG data (12 channels) of 40 subjects performing 50 different hand movements...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225778/gnb3-and-creb1-gene-polymorphisms-combined-with-negative-life-events-increase-susceptibility-to-major-depression-in-a-chinese-han-population
#14
Jingsong Ma, Lin Wang, Yanjie Yang, Zhengxue Qiao, Deyu Fang, Xiaohui Qiu, Xiuxian Yang, Xiongzhao Zhu, Jincai He, Hui Pan, Bo Ban, Yan Zhao, Hong Sui
BACKGROUND: Major depression (MD) is caused by a combination of genetic and environmental factors. In this study we investigated the interaction of variations in the G-protein beta 3 subunit (GNB3) and cAMP response element binding protein 1 (CREB1) genes with negative life events in the pathogenesis of MD. One GNB3 polymorphism (rs5443) and four CREB1 polymorphisms (rs2253206, rs2551941, rs6740584, rs11904814) were investigated based on known associations with MD. METHODS: 512 patients with MD and 513 control subjects were genotyped...
2017: PloS One
https://www.readbyqxmd.com/read/28223699/fluorescence-intermittency-originates-from-reclustering-in-two-dimensional-organic-semiconductors
#15
Anthony Ruth, Michitoshi Hayashi, Peter Zapol, Jixin Si, Matthew P McDonald, Yurii V Morozov, Masaru Kuno, Boldizsár Jankó
Fluorescence intermittency or blinking is observed in nearly all nanoscale fluorophores. It is characterized by universal power-law distributions in on- and off-times as well as 1/f behaviour in corresponding emission power spectral densities. Blinking, previously seen in confined zero- and one-dimensional systems has recently been documented in two-dimensional reduced graphene oxide. Here we show that unexpected blinking during graphene oxide-to-reduced graphene oxide photoreduction is attributed, in large part, to the redistribution of carbon sp(2) domains...
February 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28221044/tunable-volumetric-density-and-porous-structure-of-spherical-poly-%C3%A9-caprolactone-microcarriers-as-applied-in-human-mesenchymal-stem-cell-expansion
#16
Jian Li, Alan Tin-Lun Lam, Jessica Pei Wen Toh, Shaul Reuveny, Steve Kah-Weng Oh, William R Birch
Polymeric microspheres may serve as microcarrier matrices, for the expansion of anchorage-dependent stem cells. They require surface properties that both promote initial cell adhesion and the subsequent spreading of cells, which is a prerequisite for successful expansion. When implemented in a three-dimensional culture environment, under agitation, their suspension under low shear rates depends on the microcarriers having a modest negative buoyancy, with a density of 1.02-1.05 g/cm(3). Bioresorbable polycaprolactone (PCL), with a density of 1...
February 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28220764/dimensionality-reduction-based-on-distance-preservation-to-local-mean-dplm-for-spd-matrices-and-its-application-in-bci
#17
Alireza Davoudi, Saeed Shiry Ghidary, Khadijeh Sadatnejad
OBJECTIVE: In this paper, we propose a nonlinear dimensionality reduction algorithm for the manifold of Symmetric Positive Definite (SPD) matrices that considers the geometry of SPD matrices and provides a low dimensional representation of the manifold with high class discrimination in a supervised or unsupervised manner. APPROACH: The proposed algorithm, tries to preserve the local structure of the data by preserving distances to local means (DPLM) and also provides an implicit projection matrix...
February 21, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28220629/binding-of-hydroxylated-polybrominated-diphenyl-ethers-with-human-serum-albumin-spectroscopic-characterization-and-molecular-modeling
#18
Lulu Yang, Wu Yang, Zhiwei Wu, Zhongsheng Yi
Three hydroxylated polybrominated diphenyl ethers (OH-PBDEs), 3-OH-BDE-47, 5-OH-BDE-47, and 6-OH-BDE-47, were selected to investigate the interactions between OH-PBDEs with human serum albumin (HSA) under physiological conditions. The observed fluorescence quenching can be attributed to the formation of complexes between HSA and OH-PBDEs. The thermodynamic parameters at different temperatures indicate that the binding was caused by hydrophobic forces and hydrogen bonds. Molecular modeling and three-dimensional fluorescence spectrum showed conformational and microenvironmental changes in HSA...
February 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28219770/silencing-of-the-mrna-binding-protein-hur-increases-the-sensitivity-of-colorectal-cancer-cells-to-ionizing-radiation-through-upregulation-of-caspase-2
#19
Amel Badawi, Stephanie Hehlgans, Josef Pfeilschifter, Franz Rödel, Wolfgang Eberhardt
Increased abundance of the mRNA-binding protein human antigen R (HuR) is a characteristic feature of many cancers and frequently associated with a high grade malignancy and therapy resistance. HuR elicits a broad cell survival program mainly by stabilizing or increasing the translation of mRNAs coding for anti-apoptotic effector proteins. Conversally, we previously identified the pro-apoptotic caspase-2 as a novel HuR target which is mainly regulated at the level of translation. In this study, we investigated whether siRNA-mediated HuR knockdown interferes with cell survival and radiation sensitivity by monitoring apoptosis, DNA repair and three-dimensional (3D) clonogenic survival...
February 17, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28218234/durability-enhanced-two-dimensional-hole-gas-of-c-h-diamond-surface-for-complementary-power-inverter-applications
#20
Hiroshi Kawarada, Tetsuya Yamada, Dechen Xu, Hidetoshi Tsuboi, Yuya Kitabayashi, Daisuke Matsumura, Masanobu Shibata, Takuya Kudo, Masafumi Inaba, Atsushi Hiraiwa
Complementary power field effect transistors (FETs) based on wide bandgap materials not only provide high-voltage switching capability with the reduction of on-resistance and switching losses, but also enable a smart inverter system by the dramatic simplification of external circuits. However, p-channel power FETs with equivalent performance to those of n-channel FETs are not obtained in any wide bandgap material other than diamond. Here we show that a breakdown voltage of more than 1600 V has been obtained in a diamond metal-oxide-semiconductor (MOS) FET with a p-channel based on a two-dimensional hole gas (2DHG)...
February 20, 2017: Scientific Reports
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