Loading...
Search for:
hamidi-moghaddam--s
0.212 seconds
Total 11466 records
An Agent-based Architecture for Reverse Logistics in Cloud Manufacturing
, M.Sc. Thesis Sharif University of Technology ; Houshmand, Mahmoud (Supervisor)
Abstract
Cloud Manufacturing (CMfg) which is one of the newest and important business models, can have a great effect in enterprises' success by sharing information and production resources among them. Due to the semi-made products which should be transferred between distributed production centers, Logistics and Transportation concept in CMfg are very important. Reverse Logistics (RL) that is the flow of used products from customer to manufacturer, by its role in recycling and proper disposal of components, has a great impact on industry effect on environment and helps enteprises to make better profit. Despite this importance, working on RL in CMfg has not been paid attention to in former researches....
Integrated forward and reverse logistics in cloud manufacturing: an agent-based multi-layer architecture and optimization via genetic algorithm
, Article Production Engineering ; Volume 15, Issue 6 , 2021 , Pages 801-819 ; 09446524 (ISSN) ; Akbaripour, H ; Houshmand, M ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2021
Abstract
Cloud manufacturing (CMfg) is a new service-oriented manufacturing paradigm that enables distributed collaboration between manufacturers. As logistics between geographically dispersed manufacturers is indispensable in CMfg environment, and the responsibility for the whole lifecycle of products becomes more important for manufacturers, we have taken into account both forward and reverse logistics services in CMfg. Unlike most of the research in the field, this paper not only addresses the special needs of CMfg system from reverse logistics perspective but also considers the transportation of returned products. For this purpose, an agent-based architecture for tackling reverse flows in CMfg is...
Design and implementation of a new body weight support (BWS) system
, Article 5th RSI International Conference on Robotics and Mechatronics, IcRoM 2017, 25 October 2017 through 27 October 2017 ; 2018 , Pages 69-75 ; 9781538657034 (ISBN) ; Behzadipour, S ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
Gait training is a critical rehabilitation procedure for patients suffering from walking problems. It, however, puts the therapist in high orthopedic risk since he should prevent the patient from possible falling. Body weight support system is a new technology helping such patients and the involved therapist by unloading a percent of the patient's weight. A new over-ground body weight support is introduced in this article. The system is composed of two main modules namely unloading and traction. The unloading module is capable of suspending an individual's weight up to 1000N dynamically. The whole system is attached to an overhead rail, moving over the head of the patient by the traction...
Critical state concepts for a cemented gravely sand
, Article Electronic Journal of Geotechnical Engineering ; Volume 10 E , 2005 ; 10893032 (ISSN) ; Haeri, S. M ; Sharif University of Technology
2005
Abstract
The shear behavior of a cemented gravely sand that can be considered as the representative of Tehran alluvium has been studied using triaxial equipment. Artificially cemented samples were prepared using gypsum plaster as the cementing agent. The plaster was mixed with the base soil at the weight percentages between 1.5 and 6. The critical state concepts were used to illustrate the mechanical behavior of tested soil. © 2005 ejge
Block adaptive compressive sensing for distributed MIMO radars in clutter environment
, Article Proceedings International Radar Symposium, 10 May 2016 through 12 May 2016 ; Volume 2016-June , 2016 ; 21555753 (ISSN) ; 9781509025183 (ISBN) ; Mohajer Hamidi, S ; Marvasti, F ; Sharif University of Technology
IEEE Computer Society
2016
Abstract
For the target parameter estimation in MIMO radars in the presence of strong clutter, non-adaptive compressive sensing methods have a poor performance. On the other hand, the adaptive ones usually need higher data acquisition time. In this paper, we propose an adaptive compressive sensing method called L-BGT that has tolerable data acquisition time. furthermore, we have presented the essential changes in a distributed MIMO radar to exploit an adaptive group testing compressive sensing method
Uncertainty analysis of wind-wave predictions in Lake Michigan
, Article China Ocean Engineering ; Volume 30, Issue 5 , 2016 , Pages 811-820 ; 08905487 (ISSN) ; Ataie Ashtiani, B ; Hamidi, S. A ; Sharif University of Technology
Springer Verlag
2016
Abstract
With all the improvement in wave and hydrodynamics numerical models, the question rises in our mind that how the accuracy of the forcing functions and their input can affect the results. In this paper, a commonly used numerical third-generation wave model, SWAN is applied to predict waves in Lake Michigan. Wind data are analyzed to determine wind variation frequency over Lake Michigan. Wave predictions uncertainty due to wind local effects are compared during a period where wind has a fairly constant speed and direction over the northern and southern basins. The study shows that despite model calibration in Lake Michigan area, the model deficiency arises from ignoring wind effects in small...
On new nonlinearity in third-order elastic modulus for vibrational analysis of FG porous beam based on nonlocal strain gradient and surface energy by modified homotopy perturbation method
, Article European Physical Journal Plus ; Volume 137, Issue 4 , 2022 ; 21905444 (ISSN) ; Alizadeh Hamidi, B ; Maboudi, G ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
In the current study, by considering both material and geometry nonlinearity, the nonlinear free vibration of functionally graded porous nanobeams based on the nonlocal strain gradient theory is investigated. Generally, the third-order elastic modulus, von Karman strain–displacement relationship, is assumed to incorporate the nonlinearity into the differential equation of the problem. In this paper, for the first time, the nonlinear vibrational response of the nanobeam does not merely depend on the geometric nonlinearity. Also, material nonlinearity of the bulk and surface layers is taken into consideration. Governing equations and the related boundary conditions are obtained by utilizing...
Non-fragile control and synchronization of a new fractional order chaotic system
, Article Applied Mathematics and Computation ; Volume 222 , 2013 , Pages 712-721 ; 00963003 (ISSN) ; Delshad, S. S ; Hamidi Beheshti, M. T ; Tavazoei, M. S ; Sharif University of Technology
2013
Abstract
In this paper, we address global non-fragile control and synchronization of a new fractional order chaotic system. First we inspect the chaotic behavior of the fractional order system under study and also find the lowest order (2.49) for the introduced dynamics to remain chaotic. Then, a necessary and sufficient condition which can be easily extended to other fractional-order systems is proposed in terms of Linear Matrix Inequality (LMI) to check whether the candidate state feedback controller with parameter uncertainty can guarantee zero convergence of error or not. In addition, the proposed method provides a global zero attraction of error that guarantees stability around all existing...
An on-line BIST technique for delay fault detection in CMOS circuits
, Article 16th Asian Test Symposium, ATS 2007, Beijing, 8 October 2007 through 11 October 2007 ; November , 2007 , Pages 73-76 ; 10817735 (ISSN); 0769528902 (ISBN); 9780769528908 (ISBN) ; Hessabi, S ; Sharif University of Technology
2007
Abstract
This paper presents a simulation-based study of the delay fault testing in CMOS logic circuits. A novel built-in self-test (BIST) technique is presented for detecting delay faults in this logic family. This scheme does not need test-pattern generation, and thus can be used for robust on-line testing. Simulation results for area, delay, and power overheads are presented. © 2007 IEEE
Generation of motional entangled coherent state in an optomechanical system in the single photon strong coupling regime
, Article Journal of Modern Optics ; Volume 62, Issue 19 , Jul , 2015 , Pages 1685-1691 ; 09500340 (ISSN) ; Shakeri, S ; Hamidi, O ; Zandi, M. H ; Bahrampour, A ; Sharif University of Technology
Taylor and Francis Ltd
2015
Abstract
The single-photon strong coupling in the deep-resolved sideband of the optomechanical system induces photon blockade (PB) effect. For the PB cavity, an initial mechanical coherent state evolves into superposition of phonon cat states entangled with the cavity Fock states. Measurement of the cavity photon number states produces phonon even and odd cat states. The information leakage effect of two photon states on the fidelity of cat states is calculated, it is shown that for low average phonon number this effect is negligible and decreases by increasing the two photon cavity state. The Lindblad equation is solved numerically to obtain the environmental effects on the fidelity of cat states
On optimal dynamic pegging in rescheduling for new order arrival
, Article Computers and Industrial Engineering ; Volume 136 , 2019 , Pages 46-56 ; 03608352 (ISSN) ; Saitou, K ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
A rescheduling method for new order arrival is presented based on the concept of dynamic pegging in multi-level production. Upon the arrival of new, unplanned orders, dynamic pegging enables the re-assignment of the Work-In-Progress (WIP) to the existing or newly arrived orders in such a way that the cost of rescheduling is minimized. A simple yet inspiring Mixed Integer Programming (MIP) model is proposed that combines dynamic pegging with rescheduling. The resulting schedules are compared with the ones obtained from two other basic rescheduling approaches. Analysis of the comparisons confirm the superiority of the proposed method in terms of total rescheduling costs. © 2019
Predictive-reactive rescheduling for new order arrivals with optimal dynamic pegging
, Article 16th IEEE International Conference on Automation Science and Engineering, CASE 2020, 20 August 2020 through 21 August 2020 ; Volume 2020-August , 8 October , 2020 , Pages 710-715 ; Saitou, K ; Sharif University of Technology
IEEE Computer Society
2020
Abstract
This paper presents a new predictive-reactive rescheduling method for adjusting production schedules in response to the unplanned arrival of new orders in multi-level production. It is based on the concept of dynamic pegging, which enables the reassignment of the Work-In-Progress (WIP) to the existing or newly arrived orders at the time of rescheduling. Extending our previous work on reactive rescheduling with dynamic pegging, the new approach incorporates a probabilistic predictive model of new order arrival in the initial scheduling at the begging of the scheduling horizon. A Mixed Integer Programming (MIP) model is developed for two-phase, predictive-reactive scheduling before and after...
An on-line BIST technique for stuck-open fault detection in CMOS circuits
, Article 10th Euromicro Conference on Digital System Design Architectures, Methods and Tools, DSD 2007, Lubeck, 29 August 2007 through 31 August 2007 ; 2007 , Pages 619-625 ; 076952978X (ISBN); 9780769529783 (ISBN) ; Hessabi, S ; Drager ; Sharif University of Technology
2007
Abstract
This paper presents a simulation-based study of the stuck-open fault testing in CMOS logic circuits. A novel built-in self-test (BIST) technique is presented for detecting stuck-open faults in these logic families. This scheme does not need test-pattern generation, and thus can be used for robust on-line testing. Simulation results for area, delay, and power overheads are presented. © 2007 IEEE
A novel predictive-reactive rescheduling method for products assembly lines with optimal dynamic pegging
, Article Computers and Industrial Engineering ; Volume 171 , Volume 171 , 2022 ; 03608352 (ISSN) ; Saitou, K ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
In this paper a new predictive-reactive rescheduling method is presented based on the dynamic pegging concept. Scheduling adjustments in a multi-level, mixed-model production system are invoked in response to the unplanned events, such as new order arrival, changes in due dates, and order cancellation. By using the dynamic pegging approach at the time of rescheduling, Work-In-Progress (WIP) can be reassigned to the existing or new orders. Based on our previous work on reactive-only rescheduling with dynamic pegging, a Mixed Integer Programming (MIP) model is developed for predictive-reactive scheduling of new orders of different product types that arrive following exponential distribution. A...
Performance evaluation and improvement of PC-SAFT equation of state for the asphaltene precipitation modeling during mixing with various fluid types
, Article Fluid Phase Equilibria ; Volume 554 , 2022 ; 03783812 (ISSN) ; Jamshidi, S ; Sharif University of Technology
Elsevier B.V
2022
Abstract
One of the significant problems of the upstream flow assurance community is precipitation or deposition of asphaltene that leads to affect the economics of oil production seriously. Knowledge of asphaltene onset pressure (AOP) and amount of asphaltene precipitation in the change of temperature, pressure, and composition is the essential information for preventing this problem. Recent studies have shown that thermodynamic models based on the solubility nature of asphaltenes using an equation of state (EOS) are the most effective approach to asphaltene behavior modeling. In this research, the common version of the SAFT equation, known as the Perturbed Chain form of Statistical Association...
Hydrogen storage in single- and multi-walled carbon nanotubes and nanotube bundles
, Article Australian Journal of Basic and Applied Sciences ; Volume 5, Issue 7 , 2011 , Pages 483-490 ; 19918178 (ISSN) ; Golnabi, H ; Sharif University of Technology
2011
Abstract
This article describes the hydrogen storage capacity in different carbon nanotubes. The hydrogen storage capacities in the armchair, zigzag, and chiral nanotubes are investigated. The hydrogen storing capacities as a function of the carbon nanotube (CNT) diameter are investigated for the single-walled (SWNT), multi-walled (MWNT), and CNT bundles and results are compared. Hydrogen storage capacity in SWNTs is increased by increasing the nanotube diameter. For diameter d=0.3887 nm of (5,0) CNT the hydrogen capacity is 0.99%, while for the (17,17) SWNT with a diameter d=2.289 nm the capacity is increased to 5.06%. In comparison of different MWNTs for a common external diameter d=1.6064 nm the...
The effect of filler type and content on rutting resistance of asphaltic materials
, Article International Journal of Pavement Research and Technology ; Volume 12, Issue 3 , 2019 , Pages 249-258 ; 19966814 (ISSN) ; Motamed, A ; Sharif University of Technology
Springer
2019
Abstract
This research evaluates the effect of filler type and content on rutting resistance of asphaltic materials by using laboratory experiments. To examine the effect of filler type, two traditional fillers (Silica sandstone powder and Portland cement) and a new recycled lime powder (Eggshell) were considered. To investigate the effect of filler content, three different filler contents were used. Marshall Stability test was performed on full mixes in order to determine the optimum binder content of the mixtures. Then, the static creep test was performed on Fine Aggregate Matrix (FAM) samples. The permanent strain after 10 minutes of recovery (PS-660) was considered as the indicator of potential...
An Investigation on the Effect of Filler Type and Content on the Performance of Asphaltic Materials
, M.Sc. Thesis Sharif University of Technology ; Motamed, Arash (Supervisor)
Abstract
The objective of this research is evaluating the effect of filler type and content on the characteristics of asphaltic materials. The properties of the asphalt mixture are greatly influenced by its components. As asphalt mixtures are composed of two prominent components, aggregates and binder, the change in type and contents of these materials may lead to altering the performance of asphalt mixtures. Aggregates in the asphalt mixtures are categorized into three groups based on their particle sizes: coarse aggregate, fine aggregate and mineral filler. The effect of filler on the characteristics of asphalt mixtures can be examined by changing the type and content of filler and holding the...
Design and Construction of an Economic System Based on the Internet of Things (IoT) for Monitoring the Performance of Light Vessels
, M.Sc. Thesis Sharif University of Technology ; Khorasanchi, Mahdi (Supervisor)
Abstract
Having a large source and volume of data from various machinery and electronic devices, as well as the aggregation and diverse uses of this data for higher productivity, greater safety, increased reliability, and ultimately higher profits, is a necessity and demand in every industry. This is especially important in the maritime and shipping transportation sector. The solution to predicting and preventing wear, failure, and ultimately the breakdown of vessels is to have data that is continuously and automatically collected from the ship, with the capability for transmission and analysis. The goal of this project is to develop a cost-effective system for monitoring lightweight vessels, which,...
A three-stage scenario based operational performance test approaches for production capacity enhancement: Case study on the 5th refinery of South Pars Gas Complex in Iran
, Article Journal of Natural Gas Science and Engineering ; Volume 27,Part 3 , November , 2015 , Pages 1758-1770 ; 18755100 (ISSN) ; Farzad, S ; Moghaddam, S. N ; Saremi, H. S ; Sharif University of Technology
Elsevier
2015
Abstract
In this work, the possibility of capacity enhancement in the South Pars Gas Complex of Iran has been studied. Mass balance is studied and data validation and reconciliation have been carried out in 5th refinery of South Pars Gas Complex in order to achieve the reliable data of the plant. Then the possibility of capacity increase has been studied, taking into account the important parameters such as alteration of the plant pressure profile. Calculation of the key parameters for different equipment at higher feed rate, specified the unit of operations which may have trouble during the capacity enhancement. The performance of export gas compressors, dehydration unit and High-Integrity Pressure...