Sharif Digital Repository

Soft computing consists of a set of powerful methods that have been successfully applied to many different application domains, including business, engineering, and bioinformatics. In this research we propose an innovative approach that uses genetic algorithms to mine a set of behavior data output by a biological system in order to determine the kinetic parameters of the system. In our approach, the machine learning method is integrated with the framework of existent biological information in a wiring diagram so that its findings are expressed in a form of system dynamic behavior. An application of the method to the cell division cycle model has shown that the method can discover optimum... 

As accelerators develop, literature about their distinctive characteristics and functions grow. Primary studies about business accelerators focused on defining the model and finding the distinctive characteristics of business accelerators. Later studies started to ask different kind of questions about outcome, functions and especially different models of accelerators. . Accelerators in developing countries are new phenomenon. Considering the fact that economic and entrepreneurial ecosystem are different in developing countries, accelerators in these countries have some distinctive characteristics which are not studied deeply in small accelerators literature.Employing Pauwels’ design elements... 

Information Technology Strategic Planning (ITSP) is performing strategic planning in Information Technology in alignment with overall goals' of organizations. An ITSP framework is consisted of stages, instructions, and models that should be used during an ITSP project. In this research an appropriate framework for public universities which are under supervision of Ministry of Science, Research and Technology of Iran, is proposed –and not selected nor presented. Process, models, methodology and altogether framework of ITSP projects (in case of out-sourcing or doing in-house), have a vital role in the success of project. Therfore, Iranian public universities and also other educational and... 

With deployment of distributed generation such as photovoltaic (PV) and active prosumers along with demand response (DR) ability, new fields are being created for energy markets and they are moving towards a consumer-centric way. Peer-to-Peer (P2P) network is one of the top research focuses which many studies have been conducted recently. The P2P network is based on multi bilateral agreements between Prosumers that help each other to manage and balance the supply and demand of energy between each other. In this thesis, two important structures of P2P network, which are called community-based and fully-decentrilized, respectively based on MILP (mixed integer linear programing) and ADMM... 

Ocean waves are a huge, renewable energy resource, and the potential for extracting energy from waves is high. So a lot of different systems have been designed but most of them are hydraulically and have a lot of problems and they are very complex. In this thesis, the mechanism designed is purely mechanical and very simple and innovative. It has some gears in special combination with together. The mechanism can convert any form of oscillation to rotation movement; this event has been shown in results and prototype. According to the results and discussion, Designed mechanism needs very low maintenance and has low lost. So, efficiency is between 80-95%  

Walking is one of the most important physical activities in daily life and it plays an important role on body health. Despite the importance of this issue, today many people suffering from walking abnormalities. This thesis aims at designing an exoskeleton for the rehabilitation in order to help patient’s lower limb movement. The hip joint is crucial for walking and is problematic for a large number of aged people or the patients who suffered from paralysis. A number of hip and knee model checked, one model for knee and one for hip selected to combine in order to achieve a unique model for walking exoskeleton. A mechanism consisting of six link and seven joints with four degrees of freedom... 

Ultra-high temperature ceramics (UHTCs) are a class of materials that have melting points above 3000°C and include borides, carbides and nitrides of some transition metals such as ZrB2, ZrC, HfB2, HfC, HfN, TaC. These compounds are of particular interest because of the unique property combination such as high electrical and thermal conductivity, chemical inertness against molten metals or non basic slags, and good thermal shock resistance. Sintering of these compounds is very difficult due to their high melting point and utilization of sintering aids or new consolidation routes is necessary to achieve high density sintered bodies. In this research, phase evolution and kinetics of diffusion... 

Modeling and Control of Ethylene Oxide Reactor In this thesis, steady and dynamic modeling of an ethylene oxide fixed bed reactor has been studied and one dimensional pseudo homogeneous model was used for simulating the reactor. Kinetic parameters were obtained by minimizing an object function and using the genetic algorithm. A good agreement is observed between simulation and experimental results. In steady state condition, the influence of some parameters such as shell temperature, feed rate were investigated on the performance of the reactor. The heat of reaction is used to produce steam. A dynamic model for steam drum was also considered and used for control purpose. A PI controller was... 

This thesis presents the development of a Finite Element Model (FEM) for a new type of Beam-Column Semi-Rigid steel connection. This connection consists of a steel semi cylinder connected to a plate and inserted on the top and bottom of the beam connecting it to the column by welding. It seems that changing the geometry of the semi cylinders and their weld lengths can have a great influence on the rigidity or flexibility of the connection. Therefore, meaningful categories of the connection with different semi cylinder geometries and weld lengths have been modeled and investigated by means of a Finite Element Modeling software ABAQUS, and their moment-rotation curves were driven. Also the... 

In this thesis a mutliScale model based on the Cauchy-Born hypothesis and via usage of XFEM is proposed for crack modeling. By solving an example, the important of surface effects in the surface stresses region is shown. Considering not being able to model the surface effects with the Cauchy-Born method, the boundary Cauchy-Born method for modeling crack effects is used. Moreover, three Molecular Dynamics method for modeling crack will be proposed. According to the obtained results from these methods, it was deduced that for calculating the correct surface stresses in Molecular Dynamics the mutual interaction of upper and lower atoms of crack should be omitted. Finally, the validation of...