Krishna Raghuwaiya

University of the South Pacific | USP · School of Computing, Information and Mathematical Sciences

Synchronous and Asynchronous Engagement on Moodle in an English Course Offered through Blended Mode Abstract Learner engagement is a crucial component of the teaching learning process. More emphasis is placed on learner engagement with the introduction of technology-based learning. Learner engagement with the content, instructor, other learners, le...

The motion planner of several fixed-wing unmanned aerial vehicles (UAVs) using a leader-follower strategy is presented in this paper, using the architecture of the Lyapunov-based control scheme (LbCS). Here, we use the leader-follower formation type, where the flock must move in accordance with its leader through a congested workplace to fulfill it...

In this paper, we examine which interaction(s) students engage in the most on Moodle in a Pre-degree (English Foundation) course in a tertiary institute in Fiji. A mixed-method research approach was used to collect data. Quantitative data was collected and analyzed for students’ interaction on Moodle with the content, teacher, other learners, learn...

In this research, we present a motion planner for numerous fixed-wing unmanned aerial vehicles (UAVs) using the Lyapunov-based control scheme (LbCS) architecture. To go to their predetermined target, various formations of multi-robot systems must navigate a workspace in the presence of obstacles with respect to their leaders. Every formation has a...

In this paper, we looked at the factors that affect students’ interaction on Moodle. These factors were assimilated into technology acceptance model (TAM) to explore if the mentioned factors actually affected the actual usage of Moodle. A qualitative method research approach was used to collect data. Students filled in a questionnaire with open-end...

This paper addresses the development of a set of novel autonomous control laws for the navigation of multiple mini or micro quadrotors in a workspace populated with cylindrical obstacles. To the authors' knowledge, this is the first time that such a set of control inputs for the autonomous control of multiple quadrotors and avoidance of cylindrical...

In this paper, we adopt the Lyapunov- based Control Scheme (LbCS) architecture to propose a motion planner for several fixed-wing Unmanned Aerial Vehicles (UAVs). We implement the leader-follower formation type here, where the flock has to navigate in a workspace cluttered with obstacles with respect to its leader to reach its pre-defined targets....

This paper addresses the motion planning and control problem of a system of 1-trailer robots navigating a dynamic environment cluttered with obstacles including a swarm of boids. A set of nonlinear continuous control laws is proposed via the Lyapunov-based Control Scheme for collision, obstacle, and swarm avoidances. Additionally, a leader–follower...

We develop a set of novel autonomous controllers for multiple point-mass robots or agents in the presence of wall-like rectangular planes in three-dimensional space. To the authors’ knowledge, this is the first time that such a set of controllers for the avoidance of rectangular planes has been derived from a single attractive and repulsive potenti...

This Research Full paper presents finding of factors influencing the use of mobile-based assessments in higher education. With the growing popularity of mobile learning in higher education, there exists a potential of using mobile devices to deliver various types of assessments. The study aimed to find out factors influencing the adoption of mobile...

In this paper, we present a theoretical exposition into the application of an artificial potential field method, that is, the Lyapunov-based control scheme. A motion planner of mobile robots navigating in a dynamic environment is proposed. The dynamic environment includes multiple mobile robots, fixed spherical and cylindrical-shaped obstacles. The...

In this article, we address the motion planning and control problem of a mobile robot, herein considered as a navigating in a workspace with obstacle. We use Lyapunov’s second method to control the motion of the mobile robot. The minimum distance technique, incorporated for the avoidance of the cylindrical obstacle in a 3D space, used for the first...

This paper essays collision-free avoidance maneuvers of a quadrotor aircraft. We use the artificial potential field method via a scheme, known as the Lyapunov-based control scheme to extract the inputs of the control laws that will be utilized to govern the autonomous navigation of the quadrotor. The hollow cylinder, which becomes an obstacle for t...

This chapter concerns one of the first studies to introduce technology-enhanced learning activities for teaching numeracy skills in Fiji. Year 1 students from a primary school were introduced to tablet-based interactive learning activities which were developed based on the Fiji Year 1 mathematics curriculum. In this study, the impact of using techn...

In this paper, we look into the dynamic motion planning and control of an unmanned aerial vehicle, namely, the quadrotor, governed by its dynamical equations. It is shown for the first time that the Direct or the Second Method of Lyapunov is an effective tool to derive a set of continuous nonlinear control laws that not only provide smooth trajecto...

In this paper, we adopt the architecture of the Lyapunov-based Control Scheme (LbCS) and integrate a leader-follower approach to propose a collision-free path following strategy of a group of mobile car-like robots. A robot is assigned the responsibility of a leader, while the follower robots position themselves relative to the leader so that the p...

This paper addresses motion control of a cooperative intelligent transport system (C-ITS) of nonholonomic mobile robots navigating a dynamic environment while maintaining a locally rigid formation. We consider the design of acceleration-based control inputs that govern the motion of cooperative intelligent transport system (C-ITS) using the artific...

In this paper, we propose a new solution to motion planning and control problem for a flock of 1-trailer systems. A set of artificial potential field functions is proposed for the flock of 1-trailer robots via the Lyapunov-based control scheme for the avoidance of swarm of boids and attraction to their designated targets. The dynamic environment fo...

The utilization of team of robots working in a cooperative manner has huge benefits in moving large payloads. To perform such tasks, a multi robot structure or formation is necessary to coordinate the motions of the robots in a well planned manner. In this paper, the formation control problem of multi car-like mobile robots have been studied. The p...

This paper presents an approach to swarm split and rejoin maneuvers of a system of multi-robots formations. A post split formation is split into low-degree sub-swarms when the swarm encounters an obstacle. The sub-swarms reestablish links with other sub-swarms and converge into its pre-split formation after avoiding collisions with the obstacles. T...

This paper demonstrates the design process, implementation and experimental verification of an SMS based Flood Monitoring and Early Warning system. With tools such as credit top-up and storing contact numbers will be done via SMS. Updates on the height of the water level would be texted upon users' request. The system provides timely information an...

This paper presents a set of artificial potential field functions that improves upon, in general, the motion planning and posture control, with theoretically guaranteed point and posture stabilities, convergence and collision avoidance properties of the general3-trailer system in a priori known environment. We basically design and inject two new co...

This paper presents a set of artificial potential field functions that improves upon, in general, the motion planning and posture control, with theoretically guaranteed point and posture stabilities, convergence and collision avoidance properties of 3-trailer systems in a priori known environment. We basically design and inject two new concepts; gh...

In this paper, we control the motion of a flock of 1-trailer systems. A set of artificial potential field functions is proposed for split/rejoin of the flock of 1-trailer robots via the Lyapunov-based control scheme for the avoidance of obstacles and attraction to their designated targets. A leader follower strategy is used to accomplish the desire...

In this paper, we control the motion of a flock of 1-trailer systems. A set of artificial potential field functions is proposed for split/rejoin of the flock of 1-trailer robots via the Lyapunov-based control scheme for the avoidance of obstacles and attraction to their designated targets. A leader follower strategy is used to accomplish the desire...

This paper presents a set of new artificial potential field functions that improves upon, in general, the motion planning and posture control, with theoretically guaranteed point and posture stabilities, convergence and collision avoidance properties of 1-trailer systems in a priori known environment. We basically design and inject two new concepts...