Browsing by Author "Dey, Samrat Kumar"

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    Enhancing the security of cloud computing: Genetic algorithm and QR code approach
    (IEEE, 2018-01-15) Dey, Samrat Kumar; Uddin, Md. Raihan; Kabir, Kh. Mohaimenul; Rahman, Md. Mahbubur
    Paradigms of Cloud computing are gaining prevalent acceptance due to the numerous benefits they provide. These comprise cost-effectiveness, time savings and effective deployment of computing resources. However, privacy and security issues are among the major hindrances holding back the widespread adoption of this novel technology. In this context, enhancing the security of cloud computing demands the highest priority based on the popular encryption method RSA, Genetic Algorithm (GA), and 3D Quick Response (QR) code using MAC address. This paper will show an approach of amplifying the security of cloud computing. Therefore, we are proposing advanced two-step security mechanism of cloud computing. Firstly, RSA is used to provide initial protection of the first stratum. RSA approaches message as input to the hash function and generated hash values is encrypted by using generated sender key. And the receiver will generate a hash code and decrypts the message using the sender's public key. Finally, The Genetic algorithms (GA) are generalized search algorithms based on the mechanics of natural genetics. GA maintains a population of individuals that represent the candidate solutions. After successful completion of Genesis, mutation and crossover GA will provide a framework to match the desired pattern. Moreover, a media access control address (MAC address) of a device is a distinctive identifier assigned to network interfaces for communications at the data link layer of a network segment. In this context, the MAC address is used to generate the 3D Quick response code for user verification. Through experiments, we affirm that the combination of GA and 3D QR Code approach with RSA for two-step security mechanism shows strong potential to heighten the security of Cloud Computing.
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    Performance of coated carbide tools for high speed machining of hardened steel under high pressure coolant condition
    (Department of Industrial and Production Engineering, BUET, 2009-10) Dey, Samrat Kumar; Dhar, Dr. Nikhil Ranjan
    A dillieull-to-eut material like hardened ~tccl i~ used predominantly in the automotive and !>caring industries due t,) its exceptional ~-orrosi"n ami thcrmal re~istanee and high shear strength. Ahnls;ve maLhining processes such as grinding have lypically heen required to machine hardened steels, hut advances in machine tools and cutting materials have allowed hard turning '.m modern lathes to become a realistic replacement for many grinding applications. De:;pite so many advantages, implementation of hard turning remains relatively low, primarily due tn concerns about the quality of hard turned surfaces and a lack of understanding about the wear behavior of cutling took In general, the most important point in machining proccsses is the productivity, achieved by cutting the highest amount of material in the shortest possible time using t()l)ls with the longest lifetime. Combining all the parameters involved in the machining process to maximize productivity is, nevertheless, a very complex ta~k and becomes much more difficult when working at high speed machining in hardened steels. To address thi~ concern, this research investigated the ellcet:; of cbanging pmcess conditions on wear behavior when turning harden~-dmedium carbon steel (56 HRC') with coaLedcarbide cutting tools. The aim of this resean:h is to investigate the influence of fccd rate and cutting speed on the wear behavior of both ShlMG and SNMM coated carbide inserts under high pressure coolant condition. Invc>;tigation on the effC(;t of high pressure coolant on the machined chip, culling tcmpcmturc, cutting force~ alld product quality is the prime intention of this rcsC'