Sharif Digital Repository

In recent years, rehabilitation has become of particular importance due to direct connection with the quality of life of human beings. Balance training and assessment devices have been designed to provide means for rehabilitation of patients with balance problems. Sharif balance robot is an example which has been developed at Sharif University of Technology. The subject stays on a plate with active rotation in both Medial-Lateral and Anterior-Posterior directions. The active rotation of this plate is provided by two electrical motors embedded inside the machine. Position commands for this plate are sent to the electrical motor by the control hardware which consists of a PC104 running... 

The topic of knowledge creation and knowledge management is one of the most leading issues in management studies in today’s world’s organizations.Knowledge creation is known as the first and the most basic step in knowledge management and it can provide the prefaces of developing a management work frame in an organization.In this thesis after reviewing the goals and purpose of the project under consideration, the literature of knowledge management is reviewed and the most important models of knowledge management are selected and analyzed.Also, the organization selected as a case study is fully studied and the necessary information is gathered on the basis of proposed indexes at two public... 

The thesis addresses the buckling and post-buckling analysis of an elastic conical shell under non-uniform axial loading using finite element method. Non-uniform axial load is applied to one end of the truncated cone in the form of two equal-length loaded zones, diametrically opposite to each other. Material used in this thesis is isotropic with linear elasticity. The results are presented for different boundary condition. The results show that the buckling strength obtained by nonlinear analysis may be upto 40% less than the buckling strength obtained by linear analysis. The effects of boundary conditions and geometry on the results has been investigated  

The design of an indicator for "quality rate measurement" has been done in many countries around the world, and the quality rate, like other economic indicators, is subject to public judgment. Prerequisite for the formation of this index is the existence of a "comprehensive system" for quality management in the country, in which the duties and powers of various institutions in the issue of quality are specified and responsible for each process. With this excellent system, quality management is done in an integrated manner and quality can be managed efficiently by providing indicators.Quality assessment, in addition to hearing the customer's voice, requires other aspects, including examining... 

Predicting the trend of stock prices is always one of the concerns that stock market analysts and investors face with, which plays a critical role in maximizing the profit from investing in stocks. Past stock price charts, raw material prices, the value of the company's assets, the impact of global markets, the company's products, the organization's development plans, and the same other factors influencing the stock price. News reports are an important source of information for people. Recently, a lot of research has been done to examine the impact of news on stock price trends. This research has two research phases. In the first phase, a text mining method is presented which is using... 

In addition to being a popular sport in the world, football is a big industry and clubs are considered as economic enterprises of this industry. One of the most important decisions that the managers of these clubs must make is the buying and selling of players during the transfer windows, so that one decision can bring a profit or a loss of several million euros for that club.So obtaining a correct estimation of the market value and price of football players is considered a crucial requirement for club managers. With the advancement of science and the evolution of machine learning algorithms, researchers tried to create models to predict the market value of players by using the... 

In recent years, investment in financial markets has seen exponential growth in the number of investors and the capital they have invested. Investors enter these markets with the goal of maximizing their transaction profits. Therefore, they are looking for a way to predict the future of the market. On the other hand, numerous factors influence stock prices and market trends, making the prediction of these markets a highly complex task. In recent years, with the remarkable advancement of artificial intelligence, analysts’ ability to predict stock trends has greatly improved. In this research, we attempt to predict stock trends using financial market concepts and machine learning models. To... 

In the present work, the dynamic charactristics of an oil lubricated journal bearing are identified by experimental modal test. First other similar articles were studied. Then according to requrements and specifications of the bearing, a test bed is designed and constracted by existing technologies to perform tests and to collect required data. The test bed consists of several parts, including rotary shaft, stator, oil supply pack, dynamic force shaker and various sensors, which are constructed and assembled with very precise tolerances. In order to identify the dynamic coefficients of the bearing, the test process was performed using dynamic and static forces and collecting required data.... 

A significant portion of the substances used in the chemical industry are toxic and hazardous, posing major safety hazards. In this regard, studies on the flammability limits of flammable materials are important and necessary. Flammability limits are the range of fuel-oxidant mixtures that can lead to flame propagation. This project examines the flammability limits of different fuels. In this study, a set of fuels have been selected as the fuel world, and to select these compounds, their molecular structure as well as thermodynamic properties such as standard enthalpy of formation and standard enthalpy of combustion have been considered. It has been shown that by redefining the fuel world,... 

Policies affect supply chain management in oil, gas and petrochemical industries. In this study, structural equation modeling was used to evaluate the relationship between variables in AMOS software. The findings also indicated that international policies affect different aspects of supply chain management in the following order: product realization management (coordination), customer delivery management (partnership), planning management (planning) and resource management (implementation). Finally, suggestions were made on how to find financing such as bank loans, prioritizing payments in the light of their criticality, as well as on the creation. This study aimed to investigate the impact... 

The steel industry, as a key sector in the global economy, has consistently faced environmental and economic challenges. Given the necessity of reducing carbon emissions and moving towards sustainable production, the use of hydrogen as an alternative to fossil fuels in the steelmaking process has garnered attention. This research investigates the feasibility of hydrogen production through various methods and its application in the steel industry to identify the most suitable option from economic and environmental perspectives. This thesis examines the feasibility of producing and utilizing hydrogen in the steelmaking process, focusing on three hydrogen production methods (green, blue, and... 

In this thesis, a multi-stage project portfolio selection and scheduling problem in an uncertain environment is modeled, analyzed and solved. Moreover, we investigate the situations in which a project manager is confronted to a large number of projects to be selected and scheduled while the required resources of the projects are limited and renewable. The aim is to maximize objective function which is the net present value of the profit of the projects. To solve the mentioned problem, we introduce a multi-stage stochastic programming. For the reason that, in real problems, optimization problems that included all restraints are large scale and have computational complexity, these problems are... 

Profile Monitoring is a new research topics in the field of statistical process control. In many applications of statistical quality control, sometimes quality of a process or product described by a relationship between a response variable and one or more independent variables.The researchers call this relationship profile. The study seeks to demonstrate that monitoring profiles In addition, the industry can be effective in medical field and improves control of the patient's condition by a doctor. Profiles are usually modeled with a linear regression equation, non-linear or polynomial. finally, the results of this study, using actual data, models and methods to predict and control...