This paper presents forward and inverse position kinematics equations and analytical solutions for the 2-dof RRSSR Parallel Robot. Two ground-mounted perpendicular offset revolute (R) joints are actuated via servomotors, and the single-loop parallel robot consists of passive R-S-S (revolute-spherical-spherical) joints in between the active joints. A study of the multiple solutions in each case is presented, including means to select the appropriate solutions. This rigid-link parallel robot forms the hip joints of the Ohio University RoboCat walking quadruped. The methods of this paper are suitable to assist in design, simulation, control, and gait selection for the quadruped. RoboCat hardware has been built and used to help validate the examples and results of this paper.

Electronic voting has become a major interest to many countries worldwide. The most sensitive part of electronic voting is its security issues that have become a national issue in the world in developed and developing countries. The worst case plan is catastrophic when election results are without integrity. Electronic voting systems will provide accurate counting, results, results of transmission time and electoral processes are secured when it is implemented properly. This paper describes how to protect an electronic voting system against vulnerabilities like Structured Query Language (SQL) Injection, Session Hijacking, and Cross-Site Scripting. An electronic voting system was developed to test and implement how an electronic voting system can be more secured.

Cloud computing has become increasingly popular model for delivering applications hosted in large data centers as subscription oriented services. Hadoop is a popular system supporting the Map Reduce function, which plays a crucial role in cloud computing. The resources required for executing jobs in a large data center vary according to the job type. In Hadoop, jobs are scheduled by default on a first-come-first-served basis, which may unbalance resource utilization. This paper proposes a job scheduler called the job allocation scheduler (JAS), designed to balance resource utilization. For various job workloads, the JAS categorizes jobs and then assigns tasks to a CPU-bound queue or an I/O-bound queue. However, the JAS exhibited a locality problem, which was addressed by developing a modified JAS called the job allocation scheduler with locality (JASL). The JASL improved the use of nodes and the performance of Hadoop in heterogeneous computing environments. Finally, two parameters were added to the JASL to detect inaccurate slot settings and create a dynamic job allocation scheduler with locality (DJASL). The DJASL exhibited superior performance than did the JAS, and data locality similar to that of the JASL.

As a point of mathematical logic, this paper proves that the contra positive is not logically equivalent to the conditional, which disproves the “proof by contradiction” that has been used in mathematics for over a hundred years. The paper then provides suggestions for why the “proof by contradiction” may have been derived in error.

Conventional coolants have poor thermal conductivity which makes them inadequate for high cooling applications. Due to the high thermal conductivity of metals, it is suspended in the base fluid in order to improve the thermal conductivity. Nanofluids is defined as the dispersion of the nanoparticles in the conventional heat transfer such as water, ethylene glycol etc. which enhances the heat transfer performance compared to conventional fluids. This article focuses on the synthesis and analysis of Al2O3-TiO2 nanofluids using two step method and an experimental study on heat transfer analysis using tubular heat exchanger. The results show that the heat transfer characteristics and effectiveness of the nano fluid is higher than that of the conventional heat transfer fluids. The thermal conductivity of then a nofluid also increases with increase in volume concentration of nanofluid.