Archives-J 

In this paper, existence and uniqueness of solutions to three-point boundary value problems associated with a system of first order rectangular matrix differential equation involving kronecker products by using variation of parameters formula are derived. These generalize the results obtained for three-point boundary value problems involving kronecker products.

Table of contents for the month of June 2017

A small size low profile microstrip patch antenna with different shape configuration like L, U and E- shape is presented here. Slot insertion causes size reduction which increases the bandwidth and return loss. So here we will see the performance of bandwidth enhancement and return loss by graphical analysis of different value. This paper reviews the performance analysis of compact and small planar monopole antenna with symmetrical L and U- shaped slots for wireless local area network (WLAN) and worldwide Interoperability for microwave access (WiMAX) (2014). Circularly polarized arrowhead shaped slotted microstrip antenna (2014), small UWB Planar Monopole Antenna with Added GPS/GSM/WLAN Bands (2012). Application of characteristic mode to commonly used circular polarized U-slot and E-shaped patch antenna (2012). Bandwidth enhancement of a polarization reconfigurable antenna with stair slots on the ground (2014). This paper also discusses the technology incorporated in order to bring about the required change in terms of improved performance. The performances of the antenna are compared along with measured and simulated result.

This paper describes the process involved in data retrieval from heterogeneity distributed database environment which employ multiple agent system. When a user request in any environment the request is converted to a query using Natural language Processing and passed for search through specific domains which helps to reduce the computation time and further complexity. But the transfer of record to and fro between system and base station increases the network traffic, communication cost, and response time. In order to minimize the overall complexity mobile agents are used to fetch the data required from various domains. This will help to improve the performance by exploiting the sites in parallel process.

In this paper, the motivation has been to give new explicit expressions for the stationary distribution of the buffer content for a fluid queue driven by an M/M/1 queue. The expressions of the buffer content distribution is derived in terms of modified Bessel functions. Finally, numerical assessment is presented to visualize the buffer content distribution.

A reliable multicast routing enables a process to multicast a message to a group of clients in a way that ensures all the host destination group members receive the same message. Multicast routing on Wireless Mesh Networks brings great challenges in security due to its high dynamics, link vulnerability, and complete decentralization. Hence, due to its insufficient security requirements and vulnerability to attacks, a novel secure multicast routing protocol S-ODMRP, takes full advantage of trusted computing technology. The novel methods proposed overcomes the above degradation and decreases the communication cost by broadcasting the local traffic and by providing self healing mechanism to each nodes in the network so that it cures the link failure caused by the failed routers and reconstructs the multicast key path, in which the path selection is based on the link basis. And the trusted key is distributed for the secure multicast routing in the Wireless Mesh Networks. In which the trust value for each node is based on some set of rules such as the jointly behaviors, energy behaviors, and the activity model. Hence the NS-2 simulation includes various parameters such as Packet Delivery Ratio (PDR), Bandwidth overhead, cost per received packet, number of attackers and achieves the higher security and throughput.

Mobile communication is currently one of the major services that are developing at a rapid pace.4G (also known as beyond 3G) is a term used to describe the next complete evolution in wireless communications. A 4G system will be able to provide a comprehensive Internet Protocol solution where voice, data and streamed multimedia services can be provided to users on an "anytime, anywhere" basis, and at higher data rates than previous generations. This implies that roaming between different networks must be automatic and transparent to the user. The international telecommunications regulatory and standardization bodies are working for commercial deployment of 4G networks roughly in the 2012–2015 time scale.

The present paper discusses the development of a Markov model for performance evaluation of water circulation system of a thermal power plant using probabilistic approach. A water circulation system ensures a proper supply of water for smooth working of a thermal power plant. For regular and economical generation of steam, it is necessary to maintain each sub- system of this system to ensure an optimum level of availability. In present paper, the water circulation system consists of five subsystems with three possible states i.e. working, reduced and failed state. Failure and repair rates of subsystems are taken to be constant. After drawing transition diagram, differential equations have been generated. After that, steady state probabilities are determined. The system of equations is solved for steady state availability of the system using Laplace transformation technique. Besides, some decision matrices are also developed, which provide various performance levels for different combinations of failure and repair rates of all subsystems. Based upon various performance values obtained in decision matrices and plots of failure rates/ repair rates of various subsystems, performance of each subsystem is analysed and then maintenance decisions are made for all subsystems. The developed model helps in comparative evaluation of alternative maintenance strategies.

Barley is believed to have originated in Abyssinia (Ethiopia) and Southeast Asia .Sixty four barley genotypes were tested in 8x8 simple lattice design at Atsbi, Ofla and Quiha environments in Tigray region, in 2009/10. The overall objective was to determine the nature and degree of variability in morpho- agronomic traits of barley germplasm. Three types of seed/kernel colors, as quality criteria observed were white, tan/red and black in the percentage of 96.87%, except the genotypes Eritrea07 1, and ISEBON 14 with a seed color of tan red and black respectively added to the variability of 1.56% each. From this study, 60.69 % found as two-row type, 31.26% six-row types and 7.81% irregular type across locations. It was observed that from these barley genotypes had a spike density of which 6.25% were lax, 64.06% intermediate and 29.69% dense. All the testing entries were awnletted and the caryopsis or kernel covering with a percentage of the genotypes were, 21.88%, 10.94% and 65.64% stands for naked, semi-covered and covered types respectively across locations. The phenotypic diversity index values for qualitative traits ranged from 0.0 (monomorphic) for lemma/ hood to 0.86 high polymorphic for row number, for awn color (H’= 0.71), kernel covering (H’=0.84) and spike density (H’=0.82) revealed the highest diversity. Glume color (H’=0.34) and gain color (H’=0.16), relatively showed the lowest diversity

Pleomorphic adenoma is a benign mixed tumor, which is composed of myoepithelial and epithelial cells. A fibrous capsule separates these cells from the surrounding tissues. Pleomorphic adenoma has unusual histopathologic features. It is the most common benign tumor affecting both major and minor salivary glands. Parotid salivary gland is affected mostly in the major group, and palate is the most common site affected in minor salivary glands. In this case report, a female patient aged 27 years who reported with a complaint of painless swelling in the right palate is presented.