Asian Journal of Current Engineering and Maths

Coal is conventional and cheapest source of energy and is being used as major energy resource in power plants, steel industries, cement industries and other industries in India as well as in other coal rich countries of the world. To meet energy requirement of the industries, production of coal is increasing day by day. For this reason the number of mine related accidents is also increasing. To increase production of coal with reduced risk, now-a-days mobile robots are being deployed to assist mining operations. Such robots are used for various purposes, such as, exploration of geo-mining atmosphere, mine mapping, deployment of explosives, drilling and transportation of coal. While developing a mobile robot for mine application, special attention has to be given to the terrainability aspects as mine condition poses a serious challenge to the design of such robot. Mobile robots cannot perform their works if they are not specially design to negotiate adverse condition of the mine floor. In this paper terrainability of mobile robots and their performance have been studied. This paper also describes one such mine robot developed by CSIR-CMERI for use in hostile condition of Indian coal mine environment.

Cell interference and coverage shortage of base stations result in low Signal to Interference plus Noise Ratio (SINR) and poor spectral efficiency. To overcome these problems in 4G LTE-Advanced networks – A new method of capacity enhancement and performance evaluation using Sectored Relaying is proposed in this paper. The main focus is laid on the selection of the location for the relay node (RN) in the cellular network so that Access Link attains much improved performance in terms of throughput capacity and Signal to Interference plus Noise Ratio (SINR) besides improving the quality of wireless relay backhaul link. A mathematical model of the proposed system in terms of throughput capacity, path loss attenuation and Access Link SINR has been developed. The Mathematical Modeling of the proposed system has been verified by the simulations carried on Matlab 14. A significant improvement has been observed from the results, which justify the need for sectored relaying in relay enhanced networks. The parameters for simulation have been used in accordance with 4G LTE standard. Moreover, it has been observed that the proposed technique has lesser complexity with minimal deployment expenditure and performs better than the existing techniques.

In this Paper, an M/M/C/N interdependent queueing model with controllable arrival rates and reverse balking is considered. This model is much useful in analysing the particular situations arising at the places like a data voice transmission, computer communication system etc. The steady state solution and the system characteristics are derived for this model. The analytical results are numerically illustrated and the effect of the nodal parameters on the system characteristics is studied.