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Design and analysis of an actuated endoscopic grasper for manipulation of large body organs
, Article 2010 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10, 31 August 2010 through 4 September 2010, Buenos Aires ; 2010 , Pages 1230-1233 ; 9781424441235 (ISBN) ; Farahmand, F ; Sharif University of Technology
2010
Abstract
During laparoscopic surgery, grasping of large body organs such as spleen, kidney, and liver, is a difficult task using conventional instruments. This paper describes the design and analysis of a novel actuated endoscopic grasper for manipulation of large internal organs. The designed instrument resembles a miniaturized three fingered hand with each finger consisting of two links. It could pass through a 10 mm trocar and then be opened inside the abdomen to grasp body organs up to 80 mm diameter. A detailed force analysis of the mechanism revealed that high actuating forces are required to grasp large organs. In order to facilitate the actuation of the grasper, its dimensions were optimized...
Numerical investigation of thermal performance augmentation of nanofluid flow in microchannel heat sinks by using of novel nozzle structure: sinusoidal cavities and rectangular ribs
, Article Journal of the Brazilian Society of Mechanical Sciences and Engineering ; Volume 41, Issue 10 , 2019 ; 16785878 (ISSN) ; Akbari, O. A ; Toghraie, D ; Pour, M. S ; Jönsson, P. G ; Ersson, M ; Sharif University of Technology
Springer Verlag
2019
Abstract
In this paper, we present a numerical simulation of a laminar, steady and Newtonian flow of f-graphene nanoplatelet/water nanofluid in a new microchannel design with factors for increasing heat transfer such as presence of ribs, curves to enable satisfactory fluid mixing and changing fluid course at the inlet and exit sections. The results of this study show that Nusselt number is dependent on nanoparticles concentration, inlet geometry and Reynolds number. As the nanofluid concentration increases from 0 to 0.1% and Reynolds number from 50 to 1000, the Nusselt number enhances nearly up to 3% for increase in fluid concentration and averagely from 15.45 to 54.1 and from 14.5 to 55.9 for...
Cooling/heating load management in educational buildings through course scheduling
, Article Journal of Building Engineering ; Volume 41 , 2021 ; 23527102 (ISSN) ; Salehi, M ; Mohammadi, M ; Rahimof, Y ; Hajialigol, P ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
This paper presents a comprehensive educational model considering share resources among several departments bounded to educational limitations for optimizing energy consumption. The thermal model calculates the load based on the ambient temperature to minimize the user's knowledge of the building's thermal model. It determines the percentage reduction of the building's heating load in case of a change in room temperature, a term's start date, and sharing classes compared to standard curricula. It employs linear Boolean optimization. Class planning is carried out concerning minimizing energy use, students' preferences, charts, educational constraints, professors' schedules, classes' numbers,...
LAYMOD: A layered and modular platform for CAx product data integration based on the modular architecture of the standard for exchange of product data
, Article International Journal of Computer Integrated Manufacturing ; Volume 25, Issue 6 , 2012 , Pages 473-487 ; 0951192X (ISSN) ; Valilai, O. F ; Sharif University of Technology
2012
Abstract
Nowadays, companies strive to survive in a competitive global environment. Reduction of product development cycle plays a major role in market penetration and cost reduction. To speed up product development/modifications, it is suggested to adopt a collaborative product development approach. Collaborative design and manufacture requires an integrated platform to support related CAx product data models. To integrate CAx product data, a number of solutions are proposed. The most successful solution is adopting the STandard for Exchange of Product Data (STEP). In the course of the STEP standard structure and procedure development, two approaches can be recognised: classical and modular. The...
Applying the system engineering approach to devise a master's degree program in space technology in developing countries
, Article 60th International Astronautical Congress 2009, IAC 2009, Daejeon, 12 October 2009 through 16 October 2009 ; Volume 10 , 2009 , Pages 8365-8376 ; 9781615679089 (ISBN) ; Tabeshian, M ; Taheran Vernoosfaderani, M ; Sharif University of Technology
2009
Abstract
Although more than half a century is passed since space technology was first developed, developing countries are just beginning to enter the arena, focusing mainly on educating professionals. Space technology by itself is an interdisciplinary science, is costly, and developing at a fast pace. Moreover, a fruitful education system needs to remain dynamic if the quality of education is the main concern, making it a complicated system. This paper makes use of the System Engineering Approach and the experiences of developed countries in this area while incorporating the needs of the developing countries to devise a comprehensive program in space engineering at the Master's level. The needs of...
Large deformation finite element modeling of rubble mound breakwater built on soft seabed using coupled eulerian–lagrangian method
, Article Indian Geotechnical Journal ; Volume 51, Issue 2 , 2021 , Pages 315-328 ; 09719555 (ISSN) ; Shahir, H ; Pak, A ; Sharif University of Technology
Springer
2021
Abstract
For the design of rubble mound breakwaters on soft soil, it is essential to predict the behavior of soft soil and large deformations phenomena occurring in the course of construction of the rubble mound breakwater. Large deformations in various problems can be well simulated using the coupled Eulerian–Lagrangian (CEL) method. In this study, the CEL method has been used to simulate the rubble mounds construction on soft soil and predict the resulting settlements. To validate the numerical model, the results of three experiments conducted in the physical modeling laboratory at Kharazmi University were used. Also, two case studies of real rubble mound breakwaters constructed on soft seabeds...
Business intelligence in e-learning: Case study on the Iran University of Science and Technology DataSet
, Article 2nd International Conference on Software Engineering and Data Mining, SEDM 2010, 23 June 2010 through 25 June 2010 ; June , 2010 , Pages 473-477 ; 9788988678213 (ISBN) ; Moaven, S ; Abolhassani, H ; Habibi, J ; Sharif University of Technology
2010
Abstract
Nowadays, e-learning platforms are widely used by universities and other research-based and educational institutions. Despite lots of advantages these educational environments provide for organizations, yet there are many unresolved problems which cause instructors and training managers with some difficulties to get proper information about the students' learning behavior. On one hand, lack of tools to measure, assess, and evaluate the performance of learners in educational activities has led the educators to fail to guarantee the success of learning process. On the other hand, strict structure of learning materials prevents students to acquire knowledge based on their learning style....
A validation study of a virtual-based haptic system for endoscopic sinus surgery training
, Article International Journal of Medical Robotics and Computer Assisted Surgery ; Volume 15, Issue 6 , 2019 ; 14785951 (ISSN) ; Khadivar, F ; Abdollahi, E ; Moradi, H ; Farahmand, F ; Sadr Hosseini, S. M ; Vossoughi, G ; Sharif University of Technology
John Wiley and Sons Ltd
2019
Abstract
Background: The development of endoscopic sinus surgery (ESS) training simulators for clinical environment applications has reduced the existing shortcomings in conventional teaching methods, creating a standard environment for trainers and trainees in a more accurate and repeatable fashion. Materials and methods: In this research, the validation study of an ESS training simulator has been addressed. It is important to consider components that guide trainees to improve their hand movements control in the orbital floor removal in an ESS operation. Therefore, we defined three tasks to perform: pre-experiment learning, training, and evaluation. In these tasks, the critical regions introduced in...
Postural control learning dynamics in Parkinson's disease: Early improvement with plateau in stability, and continuous progression in flexibility and mobility
, Article BioMedical Engineering Online ; Volume 19, Issue 1 , 2020 ; Behzadipour, S ; Schouten, A. C ; Taghizadeh, G ; Firoozbakhsh, K ; Sharif University of Technology
BioMed Central Ltd
2020
Abstract
Background: Balance training improves postural control in Parkinson's disease (PD). However, a systematic approach for the development of individualized, optimal training programs is still lacking, as the learning dynamics of the postural control in PD, over a training program, are poorly understood. Objectives: We investigated the learning dynamics of the postural control in PD, during a balance-training program, in terms of the clinical, posturographic, and novel model-based measures. Methods: Twenty patients with PD participated in a balance-training program, 3 days a week, for 6 weeks. Clinical tests assessed functional balance and mobility pre-training, mid-training, and post-training....