Asian Journal of Engineering, Sciences & Technology

Abbreviated key title: AJEST
ISSN: 2077-1142
Published by: Iqra University
Periodicity: Bi-Annualy
Months: March & September
Start year: 2011

Title: Virtual Implementation of Simplified Advanced Encryption Standard (SAES) Author(s): Abdul Atisam Farooq, Waqas Ahmed, Zeeshan Ahmed

Abstract: Secure information transmission has always been of immense importance in all sorts of communication systems. In this area, cryptographic algorithms have been evolved and employed over decades. After the release of Advanced Encryption Standard (AES) most of the people have made its animations in 128-bit, which is very difficult to understand by the beginners. This paper is about complete structure of Simplified Advanced Encryption Standard (SAES) and its step by step implementation in graphics form using Flash. Aim of this paper is to represent SAES in such an easy way that it helps beginners to understand each step of key generation, encryption and decryption easily using 16-bit plain text as well as keys. Adding to the complete description of SAES, the authors also discuss few important points, which are needed in addition to understand for the implementation of Advanced Encryption Standard (AES) from SAES. In this paper authors also have proposed a general formula to calculate the length of the key for more than one round’s in AES and SAES.


Title: Machinability Analysis on Laser Sintered Materials with Finite Element Method Author(s): Ahmad Shahir Jamaludin, Abdullah Yassin

Abstract: The term machinability of workpiece materials relates to the easiness of a metal to be machined to an adequate surface finish. This paper clarified the analysis of laser sintered material machinability with mean of predicted cutting force and temperature distribution. 2D orthogonal cutting was employed on edge design tools with updated Lagrangian coupled thermo mechanical plane strain model. Adaptive meshing, tool edge radius and various types of friction models were assigned to obtain precise cutting results. Cutting force and cutting-edge temperature estimated by FE analysis are validated against corresponding experimental values by previous researchers. From the study, cutting force increases when radial depth increases and lowest error acquired when the shear friction factor of 0.8 was applied. Machining simulation for laser sintered materials estimated lower cutting force compared to mild steel AISI1055 due to lower Young modulus. Higher cutting temperature estimated for machining simulation laser sintered material compared to machining simulation mild steel AISI1055 due to its low thermal conductivity.


Title: A NEURAL NETWORK BASED LEVEL PREDICTOR FOR HYDROLOGICAL RESERVOIRS Author(s): L´eandre Nneme Nneme, Maarouf Saad, Jean Mbihi, Salom´e Ndjakomo Essiane

Abstract: This paper bears on the application of artificial neural networks as a mean for long term prediction in a stochastic environment. Neural networks benefit from an exceptional learning capability by adjusting their weights as a function of the in- put data. They are thus particularily well suited for prediction. Hydrological reservoirs present an interesting case for really testing the predic- tive property of artificial neural networks. This practical example yields results show- ing that the neural networks can outperform the extended Kalman filter in cases of partial or lacking informations.


Title: Generating Domination Dot Stable Graphs using Graph Operations Author(s): M. Yamuna and K. Karthika

Abstract: A graph G is said to be domination dot stable ( DDS ) if ? ( G uv ) = ? ( G ), for all u, v ? V ( G ), u adjacent to v. In this paper we show that every graph is an induced subgraph of a DDS graph and we discuss few methods of generating new DDS graphs from existing DDS graphs using various graph operations.


Title: Green Design Product Lifecycle Management for New Product Development Author(s): M.Muni Prabaharan

Abstract: The success of an organization during New Product Development activities in the long run depends on the ability to base its strategies and processes on the products it makes. This scientific paper presents green design product lifecycle management for incorporating green engineering concepts into new product design. The proposed Product Lifecycle Management tool begins at DEFINE / PLANNING phase and ends at MANAGEMENT REVIEW phase. Developing a process in green engineering is very important. Poor process would results in ineffectiveness for contributing green design into the society. The result of this paper is any organization can implement this proposed green design PLM without affecting their regular process.


Title: Examination of Noise Pollution from Generators on the Residents of Obantoko, Ogun State, Nigeria Author(s): Azodo Adinife Patrick, Adejuyigbe Samuel Babatope

Abstract: The health effects of noise among residents of Obantoko, Ogun State, Nigeria was assessed using 43- item questionnaire. A sample size of 262 persons was randomly selected which cut across different age groups and sex. Results showed that Obantoko residents are in constant exposure of generator noise which results in adverse health effect of the habitants which includeshearing impairment, interference with spoken communication, sleep disturbances, cardiovascular disturbances, impaired task performance and negative social behavior and annoyance reactions. The negative health effects of noise noted among residents of Obantoko deserves urgent attention.


Title: Use of Stone and Several Biomaterials as Course Aggregate in Concrete Author(s): H.M.A.Mahzuz1, Mushtaq Ahmed2 , Moon Moon Dhar3 and Sumaiya4

Abstract: This research is conducted to examine the performance of concrete where bio-materials like rattan, wood and bamboo are used as coarse aggregate (CA). Related comparison is made with the concrete where conventional stone is used. Three mixing ratios -1:2:2, 1:2:2 and 1:2:4, having the same water to cement ratio were considered in this research. Full study was conducted by Ordinary Portland Cement (OPC) and sand of a constant FM. The maximum size of any coarse aggregate was kept below 19 mm. Curing of all samples was done for 28 days and crushing was performed after 56 days. Within this time both the absorption and evaporation of water were measured. Finally they were crushed to identify their strength. The Stress-strain curves were also gathered from these tests. Finally it is observed that the compressive strength of the concrete samples of bamboo, wood and rattan offer much less strength that of the concrete of stone. Yet they offer the strength that may be suitable for less load bearing structures. Also as the weight of concrete was much reduced and specific heat was increased a lot by the use of these bio-aggregates.


Title: Numerical Simulation of Shock Induced Turbulence in a Nozzle flow Author(s): Mohammad Ali Jinnah

Abstract: In the present paper, a study has been conducted to investigate the shock induced turbulent flow fields and shock/turbulent-boundary layer interaction at the nozzle divergent. Experimental photographs and numerical images are used to investigate on laminar flow structures, transition phenomena, flow separation line as well as viscous boundary layer separation, turbulence structure development and shock/turbulent-boundary layer interaction. It is observed that transition from laminar to turbulent flow separation is shown earlier at the nozzle divergent for the weaker shock wave propagation and the fully developed turbulence is appeared with unsteady flow fluctuations at the end of the nozzle divergent. It is found that the pressure downstream of the separation point showed an unsteady behavior with strong oscillations, and finally jumped to values quite above the ambient pressure. By solving the 2D Navier-Stoke’s equations with k-? turbulence model, all turbulent parameters are determined at the end of the nozzle divergent and it is observed that turbulence intensities are almost uniform at the end of the nozzle divergent where slight decay phenomena are appeared along the downstream direction. The skewness of the velocity fluctuations indicates that the present flow appears to be isotropic at the end of the nozzle divergent.


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