Search for: quantitative-assessments
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    Quantitative Assessment of Fatigue in Stroke Patients During Repetitive Exercises, Using Nonlinear Dynamics Methods

    , M.Sc. Thesis Sharif University of Technology Razmand, Reza (Author) ; Zohoor, Hassan (Supervisor) ; Behzadipour, Saeed (Co-Supervisor)
    Stroke is one of the most common neurological disorders, and inability to move is the most important complication. Rehabilitation exercises are currently the most effective treatment for these patients. Fatigue during rehabilitation exercises greatly reduces the effectiveness of the exercises. Therefore, it is very important to recognize the level of fatigue.Nowadays, most of the conventional methods for measuring fatigue is either based on signal analysis (EMG) which is experimental, or report by patients and doctors might be employed as a criterion. Fatigue leads to changes in the coordination of kinematics. Hence, the main purpose of this study is to quantify fatigue corresponding to... 

    Development of a qualified nodalization for small-break LOCA transient analysis in PSB-VVER integral test facility by RELAP5 system code

    , Article Nuclear Engineering and Design ; Volume 240, Issue 10 , October , 2010 , Pages 3309-3320 ; 00295493 (ISSN) Shahedi, S ; Jafari, J ; Boroushaki, M ; D'Auria, F ; Sharif University of Technology
    This paper deals with development and qualification of a nodalization for modeling of the PSB-VVER integral test facility (ITF) by RELAP5/MOD3.2 code and prediction of its primary and secondary systems behaviors at steady state and transient conditions. The PSB-VVER is a full-height, 1/300 volume and power scale representation of a VVER-1000 NPP. A RELAP5 nodalization has been developed for PSB-VVER modeling and a nodalization qualification process has been applied for the developed nodalization at steady state and transient levels and a qualified nodalization has been proposed for modeling of the PSB ITF. The 11% small-break loss-of-coolant-accident (SBLOCA), i.e. rupture of one of the... 

    Longitudinal quantitative assessment of covid-19 infection progression from chest CTs

    , Article 24th International Conference on Medical Image Computing and Computer Assisted Intervention, MICCAI 2021, 27 September 2021 through 1 October 2021 ; Volume 12907 LNCS , 2021 , Pages 273-282 ; 03029743 (ISSN); 9783030872335 (ISBN) Kim, S. T ; Goli, L ; Paschali, M ; Khakzar, A ; Keicher, M ; Czempiel, T ; Burian, E ; Braren, R ; Navab, N ; Wendler, T ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2021
    Chest computed tomography (CT) has played an essential diagnostic role in assessing patients with COVID-19 by showing disease-specific image features such as ground-glass opacity and consolidation. Image segmentation methods have proven to help quantify the disease and even help predict the outcome. The availability of longitudinal CT series may also result in an efficient and effective method to reliably assess the progression of COVID-19, monitor the healing process and the response to different therapeutic strategies. In this paper, we propose a new framework to identify infection at a voxel level (identification of healthy lung, consolidation, and ground-glass opacity) and visualize the... 

    Development of a Method to Quantitative Assessment of Fatigue in Upper Limb Rehabilitation in Stroke Patients

    , M.Sc. Thesis Sharif University of Technology Zare Mohammadjani, Alireza (Author) ; Behzadipour, Saeed (Supervisor)
    Stroke is a common neurological disorder that can lead to a large number of complications such as mobility impairments. Rehabilitation has been known as the most effective method of treatment. In recent years, many studies have been conducted on investigating the effective factors in increasing the efficiency of the rehabilitation process. One of these parameters is muscle fatigue. The aim of this study is to devise a method for detection and quantification of fatigue level in stroke patients while performing an upper limb rehabilitation exercise in a virtual reality environment. This may be used by the therapist or the VR rehab application to optimally adjust the type and intensity of the... 

    Wavelet-based active sensing for quantitative assessment of through-thickness crack size and angle in composite plates

    , Article 28th Congress of the International Council of the Aeronautical Sciences 2012, ICAS 2012 ; Volume 3 , 2012 , Pages 2417-2424 ; 9781622767540 (ISBN) Soltani, Z ; Ekhtiari, M ; Abedian, A ; Sharif University of Technology
    Cost-effective and reliable damage detection is critical for utilization of composite materials. This paper utilizes PZT piezoelectric disks to excite the first symmetric Lamb wave (S0 mode). The interaction of Lamb wave mode with a through-thickness crack of different lengths and angles in [0/45/-45/90]s CF/EP laminate plates is analyzed in terms of finite element method. This study contributes to the damage detection by developing an improved wavelet-based signal processing technique that enhances the visibility and interpretation of the Lamb wave signals related to defects. Based on the amount of energy dissipated by the damage, a damage index is defined as the function of an electric... 

    Controllability and maintenance of human trunk response surface for isometric extension strength

    , Article ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, 12 July 2010 through 14 July 2010 ; Volume 1 , July , 2010 , Pages 733-738 ; 9780791849156 (ISBN) Azghani, M. R ; Farahmand, F ; Meghdari, A ; Hakkak, F ; Parnianpour, M ; ASME Turkey Section; Loughborough University ; Sharif University of Technology
    From an ergonomic point of view, quantitative assessment of the feasibility of the task performance is an intricate process, which combines the multidimensional task demand profile with the individual's multidimensional performance capacity profile. Trunk muscle strength is affected by the trunk posture but it is not clear how the variability of trunk muscle is affected by the trunk posture or exertion level. A validated triaxial dynamometer, Sharif-LIST, was used for to model the surface response of trunk muscle extension strength variability as a function of trunk posture in the sagittal, coronal and transverse planes in standing position. Fifteen healthy males with no history of low back... 

    Monte carlo modeling of magnification mode for quantitative assessment of image quality in mammography systems

    , Article 2019 IEEE International Symposium on Medical Measurements and Applications, MeMeA 2019, 26 June 2019 through 28 June 2019 ; 2019 ; 9781538684276 (ISBN) Safarzadeh Amiri, A ; Khodajou Chokami, H ; Vosoughi, N ; Noorvand, M ; IEEE; IEEE Instrumentation and Measurement Society; Kadir Has University (KHU); UME ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    Scattered radiations are one of the most important factors in the degradation of the image quality of mammography systems. Some techniques have been proposed for the reduction of such rays. Magnification mode can be done by increasing the air gap which determined by the distance of the breast and image intensifier. It is one of the useful techniques to elevate the produced image quality due to the rejection of scattered photons. Monte Carlo N-Particle eXtended transport code (MCNPX) version 2.7.0 is a software package for the simulation of physical processes. In this work, this computer code is used for analyzing the effects of magnification mode on mammographic image quality. To this... 

    A practical sensor-based methodology for the quantitative assessment and classification of chronic non specific low back patients (NSLBP) in clinical settings

    , Article Sensors (Switzerland) ; Volume 20, Issue 10 , 2020 Davoudi, M ; Shokouhyan, S. M ; Abedi, M ; Meftahi, N ; Rahimi, A ; Rashedi, E ; Hoviattalab, M ; Narimani, R ; Parnianpour, M ; Khalaf, K ; Sharif University of Technology
    MDPI AG  2020
    The successful clinical application of patient-specific personalized medicine for the management of low back patients remains elusive. This study aimed to classify chronic nonspecific low back pain (NSLBP) patients using our previously developed and validated wearable inertial sensor (SHARIF-HMIS) for the assessment of trunk kinematic parameters. One hundred NSLBP patients consented to perform repetitive flexural movements in five different planes of motion (PLM): 0◦ in the sagittal plane, as well as 15◦ and 30◦ lateral rotation to the right and left, respectively. They were divided into three subgroups based on the STarT Back Screening Tool. The sensor was placed on the trunk of each... 

    A novel approach to spinal 3-D kinematic assessment using inertial sensors: towards effective quantitative evaluation of low back pain in clinical settings

    , Article Computers in Biology and Medicine ; Volume 89 , 2017 , Pages 144-149 ; 00104825 (ISSN) Ashouri, S ; Abedi, M ; Abdollahi, M ; Dehghan Manshadi, F ; Parnianpour, M ; Khalaf, K ; Sharif University of Technology
    This paper presents a novel approach for evaluating LBP in various settings. The proposed system uses cost-effective inertial sensors, in conjunction with pattern recognition techniques, for identifying sensitive classifiers towards discriminate identification of LB patients. 24 healthy individuals and 28 low back pain patients performed trunk motion tasks in five different directions for validation. Four combinations of these motions were selected based on literature, and the corresponding kinematic data was collected. Upon filtering (4th order, low pass Butterworth filter) and normalizing the data, Principal Component Analysis was used for feature extraction, while Support Vector Machine... 

    Assessment of nitrate contamination in unsaturated zone of urban areas: the case study of Tehran, Iran

    , Article Environmental Geology ; Volume 57, Issue 8 , 2009 , Pages 1785-1798 ; 09430105 (ISSN) Joekar Niasar, V ; Ataie Ashtiani, B ; Sharif University of Technology
    Modeling fate of nitrogen in unsaturated and saturated zone is a complex process, which requires detailed geochemical data. Complexities of the process as well as data insufficiencies are two major issues, which make quantitative assessment of the problem more complicated. In this work, a lumped-parameter model (LPM) is proposed that has been evaluated for a data-limited case to study temporal and steady-state behavior of Nitrate and Ammonium in unsaturated zone. The concentration of components in the model are assumed as the depth-averaged concentrations, and dispersive fluxes have been neglected. The case study area is Tehran City aquifer, which is highly contaminated by domestic...