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A Framework for Agile Supply Chain based on Industry 4.0 Enabling Technologies
, M.Sc. Thesis Sharif University of Technology ; Habibi, Moslem (Supervisor)
Abstract
Supply chain management aims to increase customer satisfaction and satisfy demand with the lowest cost by establishing coordination and cooperation among the chain members. However, considerable concerns along supply chain management are reported from both academicians and practitioners. Security, visibility, transparency and traceability are the main challenges confronting supply chain management. The emerging technology named Blockchain is able to address the mentioned challenges by integrating with supply chain management. A prominent point to consider is that whether it is absolutely necessary to adopt blockchain technology in a system or not. If yes, how blockchain should be implemented...
Experimental study on the shear strength of sandy clay infilled regular rough rock joints
, Article Rock Mechanics and Rock Engineering ; Volume 48, Issue 3 , May , 2015 , Pages 907-922 ; 07232632 (ISSN) ; Sadaghiani, M. H ; Sharif University of Technology
Springer Verlag Wien
2015
Abstract
Infill materials in rock joints usually cause a reduction in the joint shear strength. The shear behavior of rock discontinuities depends upon whether they are clean and unfilled or filled, so this concern invites accurate understanding of the shear behavior and strength of infilled joints. A series of constant normal load direct shear tests was performed to investigate the shear strength of artificial samples with infilled rough joint surfaces having different asperity and infill characteristics. The current study focuses on the effects of factors that influence the shear strength of infilled rock joints samples, with emphasis on forward and reverse shearing. In the forward cycle, the front...
Study on Effect of Regular Roughness and Filling of Discontinuity in Shear Strength of Rock Mass with Laboratory Tests
, Ph.D. Dissertation Sharif University of Technology ; Sedghiani, Mohammad Hossein (Supervisor)
Abstract
Effect of discontinuities on shear behavior and shear strength of rock masses are very important. Infill materials found in natural rock discontinuities may cause a reduction in joint shear strength, influencing rock mass stability. Many researches have been done in the field of behavior of infilled and unfilled discontinuities. The models and relationships developed through such studies will be of immense help to mining and civil engineering projects in rock masses. Rough surfaces in rock masses are found in rock joints. In general this research includes studies on the effect of joint surface mechanical and geometrical characteristics, asperity orientation and infill materials mechanical...
Analysis of the TESLA Authentication Protocol in VANET and its Impact on Safety
, M.Sc. Thesis Sharif University of Technology ; Jahangir, Amir Hossein (Supervisor)
Abstract
Security is an important issue in Vehicular Ad Hoc Networks (VANETs),which are mainly aimed at enhancing safety. Analysis of security mechanisms can help design and implement secure communication establishment methods in such networks. Formal verification is an analysis approach, with the purpose of proving the correctness of a system based on defined precise assumptions. Formal verification is applicable to a vast range of systems, such as time-critical reactive systems. Timed formal verification of cryptographic protocols is a subject that has gained a lot of attention in the recent two decades. The TESLA broadcast authentication protocol is on one hand an efficient, standardized method...
Analysis of TESLA protocol in vehicular ad hoc networks using timed colored Petri nets
, Article 2015 6th International Conference on Information and Communication Systems, ICICS 2015, 7 April 2015 through 9 April 2015 ; April , 2015 , Pages 222-227 ; 9781479973491 (ISBN) ; Amin, F ; Jahangir, A. H ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
Authentication is an essential security requirement in safety-related vehicle-to-vehicle applications in VANETs. TESLA is one of the most popular broadcast source authentication protocols proposed and standardized for this purpose. Having strict time constraints and being prone to GPS synchronization errors make the analysis of this protocol challenging. In this paper, we utilize a timed model checking approach based on timed colored Petri nets to model and verify TESLA considering its time-sensitive behaviors. In this way, we show how neglecting timing aspects in protocol design and in protocol modelling can lead to successfully launched attacks and erroneous analyses respectively, and how...
A 1.5V 150MS/s current-mode sample-and-hold circuit
, Article 2005 European Conference on Circuit Theory and Design, Cork, 28 August 2005 through 2 September 2005 ; Volume 2 , 2005 , Pages 91-94 ; 0780390660 (ISBN); 9780780390669 (ISBN) ; Rajaee, O ; Jahanian, A ; Bakhtiar, M. S ; Sharif University of Technology
2005
Abstract
A high-speed current-mode sample-and-hold circuit is presented. This circuit allows for high sampling speed together with high linearity and precision. The sample-and-hold circuit has been designed and simulated in standard 0.18μm CMOS technology with 1.5V supply voltage. It is capable of operation with sampling frequency of 150MHz (300MHz using double sampling technique) for 12-bit accuracy using 3.7mW power
New Engine Bay Design For IRAN-140 Aircraft's Auxiliary Power Unit by Damage Tolerance Theory
, M.Sc. Thesis Sharif University of Technology ; Adib Nazari, Saeed (Supervisor)
Abstract
Different reasons, all structures have inside crack or surface crack when crack growth is more at the frequancy load and it is one of the main factor in the diagnosis of structural life that this sensitivity is much greater aerial parts industry. The aim of this project, designing a new structure for the auxiliary engine compartment of the aircraft with the damage tolerance theory for cargo aircraft within the country are making. In the first stage after reviewing activitation past, the evaluation design rules between each company design its obligations, standards in design and then conceptual plan to make. Then reload force plan to make. At this stage with regard to maneuver the airplane...