2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG)最新文献_第3页

Fluorescence lifetime microscope for corneal metabolic imaging 角膜代谢成像的荧光寿命显微镜

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088878

S. Silva, A. Batista, J. Domingues, M. Quadrado, M. Morgado

引用次数: 0

Correlation study between blood pressure and pulse transit time 血压与脉搏传递时间的相关性研究

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088864

T. Pereira, R. Sanches, P. Reis, J. Pêgo, Ricardo Simões

引用次数: 4

Computer-aided bone fracture identification based on ultrasound images 基于超声图像的计算机辅助骨折识别

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088892

Luís Nascimento, M. Graca Ruano

引用次数: 11

Wireless multi-physiological signal monitor for clinical discharge and readmissions criteria setting and ambulatory usage 用于临床出院和再入院标准制定和门诊使用的无线多生理信号监测仪

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088846

Tiago Marçal, Bruno Antunes, R. Ferreira, C. Correia, Diana Pires, A. Matos, Joao Nuno Simoes

引用次数: 0

Long neuroprobes based on silicon dicing and iridium oxide for electrical stimulation/recording 基于硅切割和氧化铱的长神经探针用于电刺激/记录

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088855

M. J. Oliveira, S. B. Goncalves, A. C. Peixoto, A. F. Silva, J. Correia

引用次数: 0

Biomechanical simulation of the human ear 人耳的生物力学模拟

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088813

B. Areias, M. Parente, F. Gentil, R. N. Natal Jorge, A. Fernandes

{"title":"Biomechanical simulation of the human ear","authors":"B. Areias, M. Parente, F. Gentil, R. N. Natal Jorge, A. Fernandes","doi":"10.1109/ENBENG.2015.7088813","DOIUrl":"https://doi.org/10.1109/ENBENG.2015.7088813","url":null,"abstract":"Summary form only given. In this study, the biomechanical behaviour of the human hearing was studied. An accurate finite element model can be used to evaluate the influence of certain hearing diseases and aid in their treatment, as well as help to comprehend the phenomenon of sound transmission. This research was based on the project \"The Visible Ear\" developed by a group of Danish students in order to obtain a set of high quality images of the temporal bone, using a \"cryosectioning\" procedure [1]. This project allowed the development of the computational models used. CAD software was used to treat each of the parts that compose the human ear. The first tested model (simple model) was composed of the tympanic membrane, ossicles, cochlea, two muscles, six ligaments, two joints, and the temporal bone. The full model was based on the simple model adding air to the external auditory canal and middle ear, the skin, the jaw and the ear cartilage. Comparing the results obtained by both models, it was possible to understand the importance of the ear canal in the transmission of the sound to the eardrum. The models were simulated numerically with the Abaqus software. The natural frequencies, displacements of the umbo and stapes footplate were obtained for both models, for different sound pressure levels. The frequency band used in this study was between 100 Hz and 10 kHz.","PeriodicalId":285567,"journal":{"name":"2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122367871","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

Wavelet analysis of heart rate variability during microgravity simulation 微重力模拟中心率变异性的小波分析

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088860

Mafalda Carvalho, Rui Garces, C. Tavares, I. Rocha, T. Russomano

引用次数: 2

Application of a modified Hilbert-Huang Transform to autonomic evaluation in metabolic syndrome 改进Hilbert-Huang变换在代谢综合征自主神经评价中的应用

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088858

Nataniel Gonçalves-Rosa, C. Tavares, V. Geraldes, C. Nunes-Da-Silva, I. Rocha

{"title":"Application of a modified Hilbert-Huang Transform to autonomic evaluation in metabolic syndrome","authors":"Nataniel Gonçalves-Rosa, C. Tavares, V. Geraldes, C. Nunes-Da-Silva, I. Rocha","doi":"10.1109/ENBENG.2015.7088858","DOIUrl":"https://doi.org/10.1109/ENBENG.2015.7088858","url":null,"abstract":"The physiological signals are a challenge in terms of identification and processing due to its lack of stationarity and linearity. The autonomic output to the cardiovascular system is classically quantified by analysis of heart rate variability. The Fast Fourier Transform (FFT) and Discrete Wavelet Transform applied to the cardiac signals showed limitations in terms of time and frequency resolutions. With this work we propose the application of a Modified Hilbert-Huang Transform for tachogram and systogram evaluation with the introduction of a new method to smooth fluctuations endpoint. This work presents a comparative study using FFT and Hilbert-Huang methodologies. It is known that patients and animal models with diseases involving sympathoexcitation, eg.: Metabolic Syndrome (MetS), show increases in low frequencies band. Therefore, these mathematical tools are evaluated by analyzing experimental data from two animal species: MetS-rabbits (n=6) and MetS-rats (n=6) and their respective lean age and sex-matched controls (n=6 for each group). Modified Hilbert-Huang Transform analysis showed a sympathoexcitatory condition in MetS comparing to controls both in a rabbit and in a rat model of MetS. These significant differences on sympathetic tone were also confirmed by FFT but, the parasympathetic activity, was similar between normal and MetS animals. Results and its physiological interpretation clearly show the suitability of the modified Hilbert-Huang Transform as an alternative methodology for the dynamic assessment of the autonomic nervous system in MetS.","PeriodicalId":285567,"journal":{"name":"2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG)","volume":"238 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123281368","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

Urinary incontinence in musicians: A preliminary study 音乐家尿失禁的初步研究

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088838

M. Masteling, T. Mascarenhas, R. Natal

引用次数: 0

Optimization of investment casting of Ti6Al4V HIP prostheses by numerical and experimental methods Ti6Al4V髋关节修复体熔模铸造的数值与实验优化

2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG) Pub Date : 2015-04-20 DOI: 10.1109/ENBENG.2015.7088830

N. Song, Shenghua Wu, R. Neto, M. Machado

{"title":"Optimization of investment casting of Ti6Al4V HIP prostheses by numerical and experimental methods","authors":"N. Song, Shenghua Wu, R. Neto, M. Machado","doi":"10.1109/ENBENG.2015.7088830","DOIUrl":"https://doi.org/10.1109/ENBENG.2015.7088830","url":null,"abstract":"Hip prosthesis presents a cylindrical shape with high length to diameter ratio. This medical device has to withstand many years of cyclical loading equal to at least 3 to 5 times the body weight. This intensive use requires that the product must have very good performance [1]. Ti6Al4V is a biocompatible alloy that is widely applied for manufacturing hard-tissue replacement systems such as total hip prostheses. Investment casting as a near net shape forming method is a costless and good way to produce this type of orthopaedic implants. Nonetheless, this casting process is not a straight forward task and it will easily cause centre line shrinkage. Also, Ti6Al4V is a highly reactive alloy in molten state, which will react with the ceramic shells used in investment casting. Casting defects like shrinkage and residual stress may lead to the premature fatigue failure of the prosthesis as this device is subjected to approximately one million of cyclic loads per year. Thus, during the investment casting of Ti6Al4V it is crucial to develop methodologies for eliminate or minimize the surface oxidization and central line shrinkage [2]. The face coat material has a significant effect on the surface property of this kind alloy. Moreover, the wrap technique influences the solidification sequence of the alloy. In this study, an optimization method for the investment casting of hip prostheses was explored. Different face coat materials of shell were also investigated throughout this work. Furthermore, the solidification sequence of this long cylinder shaped part was studied. Herein, experimental and numerical methods were applied. The experimental results matched well with the outcomes of the simulation runs, which validates and corroborates the proposed optimization methodology.","PeriodicalId":285567,"journal":{"name":"2015 IEEE 4th Portuguese Meeting on Bioengineering (ENBENG)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121502357","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