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A 3-D whole-body human thermoregulatory model to simulate cold-induced vasodilation in the hands and feet

Computers in Biology and Medicine 2024年 180卷 108935页

作者： Singh, Manpreet Reifman, Jaques Rubio, Jose E. Department of Defense Biotechnology High Performance Computing Software Applications Institute Telemedicine and Advanced Technology Research Center United States Army Medical Research and Development Command Fort Detrick MD United States The Henry M. Jackson Foundation for the Advancement of Military Medicine Inc. Bethesda MD United States

The cold-induced vasodilation (CIVD) response of the human body to Arctic-like environments helps delay or prevent cold injuries to peripheral regions, such as the hands and feet. To more comprehensively predict the thermal responses of these body regions to cold stress, here we extended our previously developed and validated anatomically accurate three-dimensional whole-body thermoregulatory human model by incorporating a new phenomenological formulation of the CIVD mechanism. In this formulation, we modulated the cyclic vasodilation and vasoconstriction flow of warm blood from the body core to the peripheral regions solely by determining the heat-transfer exchange between the skin and the surrounding environment, and deactivated it when the core body temperature decreased to 36.5 °C. In total, we calibrated and validated the model using eight distinct studies involving 153 unique male subjects exposed to 10 diverse experimental conditions, including cold-air exposure of the whole body as well as air exposure and cold-water immersion of the hand or the foot. With CIVD incorporated, the model predictions generally yielded root mean square errors (RMSEs) of © 2024

关键词： Heat transfer

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Accurate predictions of chaotic motion of a free fall disk

arXiv

引用

arXiv 2021年

作者： Xu, Tianzhuang Li, Jing Li, Zhihui Liao, Shijun Center of Advanced Computing School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai200240 China School of Physics and Astronomy Shanghai Jiaotong University Shanghai200240 China National Laboratory for Computational Fluid Dynamics Beijing100191 China China Aerodynamics Research and Development Center Mianyang621000 China

It is important to know the accurate trajectory of a free fall object in fluid (such as a spacecraft), whose motion might be chaotic in many cases. However, it is impossible to accurately predict its chaotic trajectory in a long enough duration by traditional numerical algorithms in double precision. In this paper, we give the accurate predictions of the same problem by a new strategy, namely the Clean Numerical Simulation (CNS). Without loss of generality, a free fall disk in water is considered, whose motion is governed by the Andersen-Pesavento-Wang model. We illustrate that convergent and reliable trajectories of a chaotic free fall disk in a long enough interval of time can be obtained by means of the CNS, but different traditional algorithms in double precision give disparate trajectories. Besides, unlike the traditional algorithms in double precision, the CNS can predict the accurate posture of the free fall disk near the vicinity of the bifurcation point of some physical parameters in a long duration. Therefore, the CNS can provide reliable prediction of chaotic systems in a long enough interval of time. © 2021, CC0.

关键词： Trajectories

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Slow Release Material from Epoxidized Natural Rubber and Rice Husk Composites for Agriculture Applications 1

Slow Release Material from Epoxidized Natural Rubber and Ric...

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1st International Conference on Green and Sustainable computing (ICoGeS)

作者： Al-Samarrai, Marwa N. Hamzah, R. Sam, S. T. Noriman, N. Z. Dahham, Omar S. Idrus, S. Z. Syed Adam, T. Center of Excellence Geopolymer and Green Technology (CEGeoGTech) Faculty of Engineering Technology (FETech) Universiti Malaysia Perlis (UniMAP) UniCITI Alam Campus Sungai Chucuh Padang Besar Perlis 02100 Malaysia School of Bioprocess Engineering Universiti Malaysia Perlis (UniMAP) Kompleks Pengajian Jejawi 3 Perlis Arau 02600 Malaysia School of Human Development and Techno-communication (IKOM) Green Advanced Computing and Technology (GREAT) Research Group-CEGeoGTech Universiti Malaysia Perlis (UniMAP) Malaysia Institute of Nano Electronic Engineering (INEE) Universiti Malaysia Perlis (UniMAP) Kangar Perlis 01000 Malaysia

This synthesis and characterization of slow release material from epoxidized natural rubber (ENR) and rice husks (RH) composites was conducted. The alkali modification of rice husks was carried using different NaOH concentration. ENR-50 and RH composites were analyzed by FTIR. Furthermore, the release behavior of the composites was invistigated using UV-visible spectroscopy. From the purified ENR-50, it can be characterized the peak epoxide group identified at 875 cm(-1) and for the isoprene at 835 cm(-1). For RH/urea beads, the CH2 peak of cellulose was obtained at 1457 cm(-1). However, the CH2 is overlapped with cellulose at 1741 cm(-1) and 1726 cm(-1) that resulted for the partial opening of epoxide ring from carbonyl peak for hemi-cellulose and lignin, there are C=C stretching from aromatic group can be obtained at 1512 cm(-1) and 1595 cm(-1). The release of the composite at 7% NaOH concentration was higher than the composite at 1% NaOH concentration.

关键词： Cellulose

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Attend and Select: A Segment Selective Transformer for Microblog Hashtag Generation

arXiv

引用

arXiv 2021年

作者： Mao, Qianren Li, Xi Liu, Bang Guo, Shu Hao, Peng Li, Jianxin Wang, Lihong Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing100191 China The State Key Laboratory of Software Development Environment Beihang University Beijing100191 China RALI Mila University of Montreal United Kingdom CENCERT/CC Beijing210016 China

Hashtag generation aims to generate short and informal topical tags from a microblog post, in which tokens or phrases form the hashtags. These tokens or phrases may originate from primary fragmental textual pieces (e.g., segments) in the original text and are separated into different segments. However, conventional sequence-to-sequence generation methods are hard to filter out secondary information from different textual granularity and are not good at selecting crucial tokens. Thus, they are suboptimal in generating more condensed hashtags. In this work, we propose a modified Transformer-based generation model with adding a segments-selection procedure for the original encoding and decoding phases. The segments-selection phase is based on a novel Segments Selection Mechanism (SSM) to model different textual granularity on global text, local segments, and tokens, contributing to generate condensed hashtags. Specifically, it first attends to primary semantic segments and then transforms discontinuous segments from the source text into a sequence of hashtags by selecting crucial tokens. Extensive evaluations on the two datasets reveal our approach's superiority with significant improvements to the extraction and generation baselines. The code and datasets are available at https://***/OpenSUM/HashtagGen. Copyright © 2021, The Authors. All rights reserved.

关键词： Semantics

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Wind Tunnel Mach Number Prediction Based on the Pruned Feature Subsets Ensemble Method

引用

Journal of Aerospace Engineering 2017年第4期30卷 1-8页

作者： Wang, Xiaojun Yuan, Ping Mao, Zhizhong Rui, Wei University Lctr. Key Laboratory of Advanced Design and Intelligent Computing Ministry of Education Dalian Univ. Dalian116622 China Institute of Automatization College of Information Science and Engineering Northeastern Univ. Shenyang110004 China Institute of High Speed Aerodynamics China Aerodynamics Research and Development Center Mianyang Sichuan621000 China

In a wind tunnel, the Mach number in the test section is an important parameter that should be predicted quickly and accurately. In building a Mach number prediction model, large-scale and high-dimensional data is the main issue. To solve the issue, the feature subsets ensemble (FSE) method has been proposed. However, a major drawback of the FSE method is that a large number of submodels are necessarily combined. In this paper, the maximum entropy pruning (MEP) method is proposed to overcome this drawback in the FSE Mach number prediction model. The MEP method refers to finding a subset of submodels that best approximates the entire submodels, while maximizing the quadratic Rényi entropy criterion. Experiments demonstrate that, with much fewer submodels than the FSE and other Mach number models, the MEP-FSE Mach number model can improve the prediction performance (i.e., the generalization), and meet the requirements of the forecasting speed and the root mean square error (less than 0.002). © 2017 American Society of Civil Engineers.

关键词： Wind tunnels

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Spectroscopic observation of the crossover from a classical Duffing oscillator to a Kerr parametric oscillator

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Physical Review A 2022年第2期105卷 023519-023519页

作者： T. Yamaji S. Kagami A. Yamaguchi T. Satoh K. Koshino H. Goto Z. R. Lin Y. Nakamura T. Yamamoto System Platform Research Laboratories NEC Corporation Kawasaki Kanagawa 211-0011 Japan NEC-AIST Quantum Technology Cooperative Research Laboratory National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8568 Japan RIKEN Center for Quantum Computing (RQC) Wako Saitama 351-0198 Japan College of Liberal Arts and Sciences Tokyo Medical and Dental University Ichikawa Chiba 272-0827 Japan Corporate Research and Development Center Toshiba Corporation Kawasaki Kanagawa 212-8582 Japan Research Center for Advanced Science and Technology (RCAST) The University of Tokyo Meguro Tokyo 153-8904 Japan

We study microwave response of a Josephson parametric oscillator consisting of a superconducting transmission-line resonator with an embedded DC-superconducting quantum interference device (-SQUID). The DC-SQUID allows to control the magnitude of a Kerr nonlinearity over the ranges where it is smaller or larger than the photon loss rate. Spectroscopy measurements reveal the change in the microwave response from a classical Duffing oscillator to a Kerr parametric oscillator in a single device. In the single-photon Kerr regime, we observe parametric oscillations with a well-defined phase of either 0 or π, whose probability can be controlled by an externally injected signal.

关键词： Quantum measurements Quantum-to-classical transition

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Adaptive CPG based coordinated control of healthy and robotic lower limb movements

Adaptive CPG based coordinated control of healthy and roboti...

引用

IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Jae-Kwan Ryu Nak Young Chong Bum Jae You Henrik Christensen Mechanical Engineering Research and Development Laboratory Gyeonggi South Korea School of Information Science Japan Advanced Institute of Science and Technology Ishikawa Japan Center of Cognitive Robotics Research Korea Institute of Science and Technology Seoul South Korea College of Computing Georgia Institute of Technology Atlanta GA USA

This paper proposes an adaptive CPG based controller for a lower limb prosthesis consisting of online trajectory generation and interlimb coordination. The adaptive CPG can produce multidimensional rhythmic patterns and modulate their frequency by tuning relevant parameters in an autonomously way adapting to a changing periodicity of external signals. Also, to increase the stability of the prosthesis, a spring-damper component is attached between the hip and ankle joints, allowing the absorption of impulsive ground reaction forces at landing. We verify the validity of the proposed controller with a simulated humanoid robot through the investigation of the self-coordination between the healthy and robotic legs.

关键词： Programmable control Adaptive control Robot kinematics Prosthetics Humanoid robots Multidimensional systems Frequency modulation Tuning Stability Hip

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The Effects of SMR L Content on the Properties of ENR-25/RSC Compounds 1

The Effects of SMR L Content on the Properties of ENR-25/RSC...

引用

1st International Conference on Green and Sustainable computing (ICoGeS)

作者： Dahham, Omar S. Hamzah, R. Noriman, N. Z. Alakrach, A. M. Idrus, S. Z. Syed Shayfull, Z. Adam, T. Mohammed, M. Center of Excellence Geopolymer and Green Technology (CEGeoGTech) Faculty of Engineering Technology (FETech) Universiti Malaysia Perlis (UniMAP) UniCITI Alam Campus Sungai Chucuh Padang Besar Perlis 02100 Malaysia School of Human Development and Techno-communication (IKOM) Green Advanced Computing and Technology (GREAT) Research Group-CEGeoGTech Universiti Malaysia Perlis (UniMAPO) Malaysia School of Manufacturing Engineering Universiti Malaysia Perlis Arau 02600 Malaysia Green Design and Manufacture Research Group Center of Excellence Geopolymer and Green Technology (CEGeoGTech) Universiti Malaysia Perlis Kangar 0100 Malaysia Institute of Nano Electronic Engineering (INEE) Universiti Malaysia Perlis (UniMAP) Kangar Perlis 01000 Malaysia Center of Excellence Geopolymer and Green Technology (CEGeoGTech) School of Materials Engineering Universiti Malaysia Perlis (UniMAP) Kompleks Pengajian Jejawi 2 Arau 02600 Malaysia

Normally, direct introduction of recycled materials into polymer matrix could cause unwanted aggregations, which could effect on the properties of the final product. However, adding third material as a compatibilizer could enhance the properties of the product. This work studied the effects of different SMR L content (2,4,6,8 and 10 Phr) as a compatibilizer on the physical, tensile properties, and cure characteristics of ENR-25/rSC compounds. The results of cure characteristics showed decreasing on scorch time (t(2)) and cure time (t(90)) while increasing on minimum torque (M-L) and maximum torque (M-H) as SMR L increased in ENR25/rSC/SMR L compounds. The values of modulus (M100), tensile strength (Ts), hardness and crosslinking density increased gradually with increasing SMR L while elongation at break (Eb) decreased.

关键词： Tensile strength

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The Influences NaOH Treatment on Polypropylene/Cyperus Odoratus (PP/CY) Composites: Tensile and Morphology 1

The Influences NaOH Treatment on Polypropylene/<i>Cyperus Od...

引用

1st International Conference on Green and Sustainable computing (ICoGeS)

作者： Dahham, Omar S. Noriman, N. Z. Hamzah, R. Al-Samarrai, Marwa N. Idrus, S. Z. Syed Shayfull, Z. Adam, T. Mohammed, M. Center of Excellence Geopolymer and Green Technology (CEGeoGTech) Faculty of Engineering Technology (FETech) Universiti Malaysia Perlis (UniMAP) UniCITI Alam Campus Sungai Chucuh Padang Besar Perlis 02100 Malaysia School of Human Development and Techno-communication (IKOM) Green Advanced Computing and Technology (GREAT) Research Group-CEGeoGTech Universiti Malaysia Perlis (UniMAP) Malaysia School of Manufacturing Engineering Universiti Malaysia Perlis Arau 02600 Malaysia Green Design and Manufacture Research Group Center of Excellence Geopolymer and Green Technology (CEGeoGTech) Universiti Malaysia Perlis Kangar 0100 Malaysia Institute of Nano Electronic Engineering (INEE) Universiti Malaysia Perlis (UniMAP) Kangar Perlis 01000 Malaysia Center of Excellence Geopolymer and Green Technology (CEGeoGTech) School of Materials Engineering Universiti Malaysia Perlis (UniMAP) Kompleks Pengajian Jejawi 2 Arau 02600 Malaysia

The bio-plastic composite has attracted the attention of people who work in academic and industrial fields due to the several advantages of this composite as compared with conventional plastic composites. However, the modification of the natural filler used in the bio-composites usually needs a modification before use. In the current work, the chemical modification on Cyperus Odoratus (CY) using different sodium hydroxide (NaOH) concentration at 1, 3, 6 and 9 wt.% were used to investigate the effect of this modification on the tensile properties of Polypropylene/Cyperus Odoratus (PP/CY) composites. The extrusion and injection molding processes were used respectively to prepare the composites. Results suggest that the presence of NaOH, particularly 3 wt.% has improved the tensile strength and the elongation at break of the composite. By contrast, the high NaOH concentration, particularly 9 wt.% has effected negatively on this properties. The tensile modulus increased linearly as NaOH concentration increased in the composites. The SEM micrograph of treated specimens at 3 wt.% NaOH shows improvement on CY surface while 9 wt.% NaOH shows deterioration on the DS surface.

关键词： Sodium hydroxide

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Grid portal interface for interactive use and monitoring of high-throughput proteome annotation

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First International Workshop on Life Science Grid, LSGRID 2004 - Grid computing in Life Science

作者： Shahab, Atif Chuon, Danny Suzumua, Toyotaro Li, Wilfred W. Byrnes, Robert W. Tanaka, Kouji Ang, Larry Matsuoka, Satoshi Bourne, Philip E. Miller, Mark A. Arzberger, Peter W. Bioinformatics Institute 30 Biopolis Street #07-01 Matrix Singapore 138671 Singapore Dept. of Mathematical and Computing Sciences 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 Japan Global Scientific Information and Computing Center 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 Japan Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 Japan Research and Development for Applied Advanced Computational Science and Technology Japan Science and Technology Agency 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan Department of Pharmacology San Diego Supercomputer Center University of California San Diego 9500 Gilman Drive San Diego CA 92093 United States Life Sciences Initiatives San Diego Supercomputer Center University of California San Diego 9500 Gilman Drive San Diego CA 92093 United States

ISBN: (纸本)3540252088

High-throughput proteome annotation refers to the activity of extracting information from all proteins in a particular organism using bioinformatics software on a high performance computing platform such as the grid. The Encyclopedia of Life (EOL) project [1] aims to catalog all proteins in all species for public benefits using an Integrative Genome Annotation Pipeline [2] (iGAP). The intrinsic complexity of the pipeline makes iGAP an ideal life sciences application to drive grid software development. It is a flagship application for the TeraGrid project [3]. The deployment of iGAP on the grid using grid middleware and mediator software has been described previously [4]. The heterogeneous and distributed computing environment on the grid requires an interactive user interface where jobs may be submitted and monitored. Here we describe our international collaborative effort in creating a grid portal solution for grid computing in life sciences under the auspices of PRAGMA [5]. Specifically, the development of GridMonitor for interactive monitor of iGAP workflow, and the use of a GridSpeed [6] generated iGAP application portal are described. The portal solution was part of the EOL demonstration at Supercomputing 2003 (SC'03) [7], where resources from 6 institutions on 5 continents are utilized to annotate more than 36,000 proteins from various species. It is a testimony to the necessity and expediency for international collaboration in an increasingly global grid computational environment to advance life sciences research. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Interfaces (computer)

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