Sharif Digital Repository

In this thesis a two-tier supply chain containing an upstream supplier and a downstream producer have been modeled. This model presents a replicator interaction in supply chain. In this model supplier has to choose between two different production strategies which provide two types of output-quality. It is obvious the method with better output-quality has more production cost and the one with lower output-quality has lower production cost. The strategy of producer is to choose whether test the production before process it in production line or not. By the tool of evolutionary game theory trends of changing in players' strategies have been modeled and Nash equilibrium points and the types of... 

Communication Buoys are devices that facilitate radio communication between underwater ships and surface stations. In this research such device is thoroughly designed for a submersible application. The system comprises of buoy, connection cable, buoy cavity, cable passage, winch and other supporting and safety subsystems. Buoy and cable system was analyzed in a general form and their stable states were determined for different ship maneuvers, sea streams, and wave conditions. Based on this, optimum buoy geometry and cable length were found for the defined application and other subsystems were detail designed. To evaluate the design, some of the system components were manufactured and... 

Cars with high center of gravity, such as SUV-Sport Utility Vehicles- have high tendency to roll over in high speeds and rapid maneuvers. An idea formerly proposed is to use a high speed rotating disc like a gyroscope on the onset of the rollover to exert a high stabilizing moment on the vehicle, and consequently prevent rollovers. Also using two counter rotating discs with opposite nutation will prevent interference with the car other degrees of freedom. To reduce the interference of the spinning discs with the vehicle dynamics, the discs are to be brought to speed by the action of a high accelerating mechanism during the rollover process(similar to the action of an airbag). This project... 

Correlation-intractability is a random-oracle-like property of hash functions, so one can expect that constructions that are secure in random-oracle-model, remain secure when implemented using a correlation-intractable hash function. This is true about Fiat-Shamir transform which is a method for eliminating interaction from public-coin interactive proofs. One can see that when this method is applied to a public-coin three-round honest-verifier zero-knowledge proof, using a correlation-intractable hash function that also satisfies some mild assumption, the result is a NIZK argument. This is the basis for the correlation-intractability framework for NIZK which recently has been used to... 

Identification of dust storm hotspots using high resolution 1 km MODIS Aerosol Optical Depth (AOD) data obtained by MAIAC algorithm for a region including Iran and its neighbors, is one of the objectives of the present study. By implementing three important statistics on AOD and averaging over the last decade time period (2009-2019), dust sources of Iran, Iraq, Syria, Saudi Arabia, Oman, Afghanistan, and Pakistan were specified. These statistics include frequency of occurrence AOD>0.3, mean and coefficient of variation of aerosol optical depth. The membership rank of source zones in the set of hotspot areas has been obtained by applying the fuzzy logic approach on the three mentioned layers....