Regression-based convolutional 3D pose estimation from single image

, Article Electronics Letters ; Volume 54, Issue 5 , March , 2018 , Pages 292-293 ; 00135194 (ISSN) Ershadi Nasab, S ; Kasaei, S ; Sanaei, E ; Sharif University of Technology

Institution of Engineering and Technology 2018

Abstract

Estimation of 3D human pose from a single image is a challenging task because of ambiguities in projection from 3D space to the 2D image plane. A new two-stage deep convolutional neural network-based method is proposed for regressing the distance and angular difference matrices among body joints. Using the angular difference between body joints in addition to the distance between them in articulated objects such as human body can better model the structure of the shapes and increases the modelling capability of the learning method. Experimental results on HumanEva I and Human3.6M datasets show that the proposed method has substantial improvement in the mean per joint position error measure...

Uncalibrated multi-view multiple humans association and 3D pose estimation by adversarial learning

, Article Multimedia Tools and Applications ; 2020 Ershadi Nasab, S ; Kasaei, S ; Sanaei, E ; Sharif University of Technology

Springer 2020

Abstract

Multiple human 3D pose estimation is a useful but challenging task in computer vison applications. The ambiguities in estimation of 2D and 3D poses of multiple persons can be verified by using multi-view frames, in which the occluded or self-occluded body parts of some persons might be visible in other camera views. But, when cameras are moving and uncalibrated, estimating the association of multiple human body parts among different camera views is a challenging task. This paper presents novel methods for multiple human 3D pose estimation and pose association in multi-view camera frames in an uncalibrated camera setup using an adversarial learning framework. The generator is a 3D pose...

Uncalibrated multi-view multiple humans association and 3D pose estimation by adversarial learning

, Article Multimedia Tools and Applications ; Volume 80, Issue 2 , 2021 , Pages 2461-2488 ; 13807501 (ISSN) Ershadi Nasab, S ; Kasaei, S ; Sanaei, E ; Sharif University of Technology

Springer 2021

Abstract

Multiple human 3D pose estimation is a useful but challenging task in computer vison applications. The ambiguities in estimation of 2D and 3D poses of multiple persons can be verified by using multi-view frames, in which the occluded or self-occluded body parts of some persons might be visible in other camera views. But, when cameras are moving and uncalibrated, estimating the association of multiple human body parts among different camera views is a challenging task. This paper presents novel methods for multiple human 3D pose estimation and pose association in multi-view camera frames in an uncalibrated camera setup using an adversarial learning framework. The generator is a 3D pose...

Multiple human 3D pose estimation from multiview images

, Article Multimedia Tools and Applications ; Volume 77, Issue 12 , June , 2018 , Pages 15573-15601 ; 13807501 (ISSN) Ershadi Nasab, S ; Noury, E ; Kasaei, S ; Sanaei, E ; Sharif University of Technology

Springer New York LLC 2018

Abstract

Multiple human 3D pose estimation is a challenging task. It is mainly because of large variations in the scale and pose of humans, fast motions, multiple persons in the scene, and arbitrary number of visible body parts due to occlusion or truncation. Some of these ambiguities can be resolved by using multiview images. This is due to the fact that more evidences of body parts would be available in multiple views. In this work, a novel method for multiple human 3D pose estimation using evidences in multiview images is proposed. The proposed method utilizes a fully connected pairwise conditional random field that contains two types of pairwise terms. The first pairwise term encodes the spatial...

Multiple human 3D pose estimation from multiview images

, Article Multimedia Tools and Applications ; 2017 , Pages 1-29 ; 13807501 (ISSN) Ershadi Nasab, S ; Noury, E ; Kasaei, S ; Sanaei, E ; Sharif University of Technology

2017

Abstract

Multiple human 3D pose estimation is a challenging task. It is mainly because of large variations in the scale and pose of humans, fast motions, multiple persons in the scene, and arbitrary number of visible body parts due to occlusion or truncation. Some of these ambiguities can be resolved by using multiview images. This is due to the fact that more evidences of body parts would be available in multiple views. In this work, a novel method for multiple human 3D pose estimation using evidences in multiview images is proposed. The proposed method utilizes a fully connected pairwise conditional random field that contains two types of pairwise terms. The first pairwise term encodes the spatial...

3D Reconstruction of Human Pose in Multi-View Dynamic Scenes

, Ph.D. Dissertation Sharif University of Technology Ershadi Nasab, Sara (Author) ; Sanaei, Esmaeil (Supervisor) ; Kasaei, Shohreh (Co-Advisor)

Abstract

In this thesis, 3D pose reconstruction of one or multiple humans in multi-view dynamic scene is considered. Inputs are multi-view frames of multi-view camera systems. Outputs are the 3D reconstructed human poses in 3D space. The pose is the location of 14 human body joints in the 3D space. In this research, it is not allowed to use Kinect sensor data or other Markers or GPS sensors. It is supposed that only multi-view images are used. 3D reconstruction of human body pose can be performed with different assumptions. For example, the scene is indoor only or the camera calibration information is provided at first.Cameras are moving or fixed. In this research, each of this assumption is regarded...

Investigation of integrated smooth transistor's switching transition power amplifier-2.4-GHz realization of class-EM

, Article IEEE Transactions on Microwave Theory and Techniques ; Volume 65, Issue 8 , 2017 , Pages 3046-3055 ; 00189480 (ISSN) Ershadi, A ; Medi, A ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2017

Abstract

This paper proposes a design technique for the implementation of a class-EM power amplifier (PA). Class- EM mode of operation has been proposed as an improved version of class-E in terms of efficiency and power gain, provided that the current fall time of switch is an appreciable portion of a period; the frequency of operation is high enough that the switching time of transistor can no longer be considered instantaneous. A novel approach for harmonic injection required for class-EM operation is proposed, followed by the system of equations and the design methodology governing the proposed circuit. As a proof of concept and verification of the proposed design method, a class-EM PA is designed...

Desgin and Implementation of Integrated Class EM Power Amplifier at 2.4 GHz

, M.Sc. Thesis Sharif University of Technology Ershadi, Ali (Author) ; Medi, Ali (Supervisor)

Abstract

This project proposes a novel design technique for implementation of class-EM power amplifier (PA). Class-EM mode of operation has been proposed as the improved version of class-E; outclasses in terms of efficiency as well as power gain. Specifically, provided that the current fall time of switch is an appreciable portion of a period; frequency of operation is high enough that the switching time of transistor can no longer be considered instantaneous in other words. A novel technique for harmonic injection required for class-EM operation is proposed. Followed by the system of equations and the design methodology governing the proposed circuit. As a proof of concept and verification of the...

AM3D: An accurate crosstalk probability modeling to predict channel delay in 3D ICs

, Article Microelectronics Reliability ; Volume 102 , 2019 ; 00262714 (ISSN) Shirmohammadi, Z ; Nikoofard, A ; Ershadi, G ; Sharif University of Technology

Elsevier Ltd 2019

Abstract

Migration from Two Dimensional Integrated Circuits (2D ICs) to Three Dimensional Integrated Circuits (3D ICs) reduces the delay due to the shorter wire length between sender and receiver. However, Through-Silicon-Vias (TSVs) that connect layers in the structure of 3D ICs can seriously increase the delay due to capacitance coupling between TSVs and lead to crosstalk fault. The severity of crosstalk faults depends on transitions appearing on TSVs that is called transition patterns. To propose an efficient crosstalk tackling mechanisms in 3D ICs, an accurate probability analytical model is required to predict the delay caused by TSVs (3D ICs) in the attendance of these transition patterns. In...

LESS-MICS: A low energy standby-sparing scheme for mixed-criticality systems

, Article IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems ; Volume 39, Issue 12 , 2020 , Pages 4601-4610 Safari, S ; Hessabi, S ; Ershadi, G ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2020

Abstract

Multicore platforms are becoming the dominant trend in mixed-criticality systems (MCSs). Multicores provide great opportunities to realize task-level redundancy for reliability enhancement. However, they may experience limited utility in battery-powered mixed-criticality embedded systems. Hence, joint energy and reliability management is a crucial issue in designing MCSs. In this article, we propose the low energy standby-sparing mechanism in mixed-criticality system (LESS-MICS) scheme, which uses the inherent redundancy of multicores to apply the standby-sparing technique for fault-tolerance. Also, by using the inherent redundancy, the LESS-MICS scheme proposes the Parallelism and Reduction...

Role of Affective Commitment in the Relationship between Ostracism and Turnover Intention

, M.Sc. Thesis Sharif University of Technology Zeytonli, Asiyeh (Author) ; Banki, Sara (Supervisor)

Abstract

A lot of researchers have suggested that ostracism as a disruptive behavior, has been widespread among organizations and a lot of researches has been studied its consequences in recent years.This research studies ostracism’s consequences and proposes a theoretical model of organizational ostracism with affective commitment, intention to turnover and organizational dependability as one of affective commitment’s antecedents. This study has been done on 231 employees of three medium knowledge-based organizations to identify the effects of ostracism on employee’s turnover behavior. Results show that ostracism, due to its impact on the affective commitment of ostracized peoples, reduces this type...

On the scheduling of energy-aware fault-tolerant mixed-criticality multicore systems with service guarantee exploration

, Article IEEE Transactions on Parallel and Distributed Systems ; Volume 30, Issue 10 , 2019 , Pages 2338-2354 ; 10459219 (ISSN) Safari, S ; Ansari, M ; Ershadi, G ; Hessabi, S ; Sharif University of Technology

IEEE Computer Society 2019

Abstract

Advancement of Cyber-Physical Systems has attracted attention to Mixed-Criticality Systems (MCSs), both in research and in industrial designs. As multicore platforms are becoming the dominant trend in MCSs, joint energy and reliability management is a crucial issue. In addition, providing guaranteed service level for low-criticality tasks in critical mode is of great importance. To address these problems, we propose LETR-MC scheme that simultaneously supports certification, energy management, fault-tolerance, and guaranteed service level in mixed-criticality multicore systems. In this paper, we exploit task-replication to not only satisfy reliability requirements, but also to improve the QoS...

Measuring data quality of theses and dissertations in the data preparation stage of registration systems

, Article International Journal of Information Science and Management ; Volume 21, Issue 4 , 2023 , Pages 189-213 ; 20088302 (ISSN) Ershadi, M. J ; Mohseni, A ; Akhavan Niaki, T ; Sharif University of Technology

Regional Inform. Center for Sci. and Technol 2023

Abstract

Today, academic research plays a very influential role in the economic development of countries. These researches are often recorded and disseminated in the form and structure of theses and dissertations in scientific institutes. The better the quality of this data in the systems that collect and distribute it, the more it can be used and exploited by organizations and businesses. Therefore, providing this data requires proper monitoring to put the output of the recording and dissemination process in good condition. This paper offers a framework for evaluating theses and dissertation data quality. In the framework, the data inconsistency coding structure is introduced and presented in Word...

Economic-Statistical Design and Evaluation of Multivariate Control Charts; An Improvement of Cost Model and Constraints Approach

, M.Sc. Thesis Sharif University of Technology Ershadi, Mohammad Javad (Author) ; Akhavan Niaki, Taghi (Supervisor)

Abstract

Control charts are the best tools for determining the deviations in the main parameters of a process. Exponentially weighted moving average, EWMA, control charts are the best type for determining small deviations. Determining the control charts parameters by means of minimizing a cost model is economic design. Economic-statistical design is achieved by adding statistical constraints to the economic model. Average run length when the process is in control, ARL0, and average run length when the process is out of control, ARL1, are limited in the economic-statistical model. In this thesis the economic-statistical design of a multivariate EWMA control chart is considered and this model is solved...

Lot sizing and job shop scheduling with compressible process times: A cut and branch approach

, Article Computers and Industrial Engineering ; Volume 85 , 2015 , Pages 196-205 ; 03608352 (ISSN) Karimi Nasab, M ; Modarres, M ; Sharif University of Technology

Elsevier Ltd 2015

Abstract

This paper studies simultaneous lot sizing and scheduling problem in a job shop environment over a finite number of periods. The machines are flexible such that the production manager is able to change their working speeds. Also, the production schedule of the items over machines should be in consistence with technological precedence relationships. The problem is formulated as an integer linear program. Then, a number of valid inequalities are developed based on the problem structures. The proposed valid inequalities are added to the problem formulation in a "cut and branch" manner to accelerate the search process by common solvers. Finally, performance of the valid inequalities is...

Thermal stresses and kinetics of phase transformation on the run-out table after hot strip rolling of low-carbon steels

, Article International Journal of Advanced Manufacturing Technology ; Volume 83, Issue 9-12 , 2016 , Pages 1725-1736 ; 02683768 (ISSN) Hasan Nasab, M ; Serajzadeh, S ; Sharif University of Technology

2016

Abstract

A thermo-elastic analysis coupled with a phase change model is employed to evaluate thermal stresses as well as progress of austenite decomposition after hot strip rolling operations. The thermo-mechanical finite element analysis is utilized to assess the distributions of temperature and thermal stresses during cooling while at the same time, a model based on the additivity rule is used to determine the rate of austenite to ferrite decomposition. The proposed model is applicable to multi-pass rolling schedules while the effects of different process parameters including the rolling speed and cooling configuration of the run-out table can be taken into account. In order to verify the...

A Multi-Output high voltage dc power supply with fast regenerative rectifier

, Article 26th Iranian Conference on Electrical Engineering, ICEE 2018, 8 May 2018 through 10 May 2018 ; 2018 , Pages 1264-1268 ; 9781538649169 (ISBN) Naghibi Nasab, J ; Kaboli, S ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2018

Abstract

A major problem in a multiple output converter structure is the different power flow via its various outputs. This problem leads to unwanted input DC-link voltage. This paper studies full bridge based DC-DC converters with multiple outputs. The effect of power flow variation is studied and a regenerative converter topology which controls the DC-link voltage by space voltage vector modulation technique is proposed. The proposed converter has a fast response to control the DC-link voltage in an acceptable band. Simulation and experimental results are presented to verify the analytical studies. © 2018 IEEE

Estimation of origin–destination matrices using link counts and partial path data

, Article Transportation ; Volume 47, Issue 6 , 2020 , Pages 2923-2950 Rostami Nasab, M ; Shafahi, Y ; Sharif University of Technology

Springer 2020

Abstract

After several decades of work by several talented researchers, estimation of the origin–destination matrix using traffic data has remained very challenging. This paper presents a set of innovative methods for estimation of the origin–destination matrix of large-scale networks, using vehicle counts on links, partial path data obtained from an automated vehicle identification system, and combinations of both data. These innovative methods are used to solve three origin–destination matrix estimation models. The first model is an extension of Spiess’s model which uses vehicle count data while the second model is an extension of Jamali’s model and it uses partial path data. The third model is a...

New half-pixel accuracy motion estimation algorithms for low bitrate video communications

, Article Scientia Iranica ; Volume 15, Issue 6 , 2008 , Pages 507-516 ; 10263098 (ISSN) Mahdavi Nasab, H ; Kasaei, S ; Sharif University of Technology

Sharif University of Technology 2008

Abstract

Fractional-pixel accuracy Motion Estimation (ME) has been shown to result in higher quality reconstructed image sequences in hybrid video coding systems. However, the higher quality is achieved by notably increased Motion Field (MF) bitrate and more complex computations. In this paper, new half-pixel block matching ME algorithms are proposed to improve the rate-distortion characteristics of low bitrate video communications. The proposed methods tend to decrease the required video bandwidth, while improving the motion compensation quality. The key idea is to put a deeper focus on the search origin of the ME process, based on center-bias characteristics of low bitrate video MFs. To employ the...

Half-pixel accuracy block matching motion estimation algorithms for low bitrate video communications

, Article First IEEE and IFIP International Conference in Central Asia on Internet, 2005, Bishkek, 26 September 2005 through 28 September 2005 ; Volume 2005 , 2005 ; 0780391799 (ISBN); 9780780391796 (ISBN) Mahdavi Nasab, H ; Kasaei, S ; Sharif University of Technology

2005

Abstract

Motion estimation at fractional-pixel accuracy results in higher quality video sequences. However, the higher quality is achieved by more computations and increased required motion field bitrates. In this paper, new half-pixel accuracy block matching-based motion estimation algorithms are proposed to improve the rate-distortion characteristics of low-bitrate video communications. The proposed methods especially tend to decrease the required video bandwidth, with no degradation in quality of reconstructed image sequences. The key idea is to put a deeper focus on the origin (zero motion) based on the center-bias characteristics of low bitrate video motion fields. The experimental results show...