Browsing by Author "Mujuni, E."
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Item En Examination Scheduling Algorithm Using Graph Coloring – the case of Sokoine University of Agriculture(International Journal of Computer Engineering & Applications, 2013) Mushi, Allen R.; Mohamed, A. S.; Mujuni, E.This paper presents a graph coloring based algorithm for Examinations Timetabling Problem at Sokoine University of Agriculture (SUA) in Tanzania. A Recursive Largest First algorithm for graph coloring is applied to find timeslots. We present a summary of results which indicates good performance.Item Optimization model for Solid Waste Management at Ilala Municipal(Tanzania, Journal of Informatics and Virtual Education, 2011) Lyeme, H. A.; Mujuni, E.; Mushi, Allen R.Item Optimization of Municipal Solid Waste Management Problem with Composting Plants – The case of Ilala Municipality(International Journal of Advances in Computer Science and Technology, 2013) Mushi, Allen R.; Kahebo, M.; Mujuni, E.Solid Waste Management is one of the critical environmental challenges for quick urban developing countries. It involves a number of problems that requires optimization techniques for better decision making. These include the selection of collection points, disposal sites, and vehicle routing mechanisms. This paper addresses the problem of optimization of solid waste systems which involves the use of composting plants as a strategy in environmental management. A mathematical programming model is developed and tested on real data from Ilala Municipal in Dar es Salaam Tanzania. The formulated model resulted into lower transportation cost from sources to collection points, composting plant and landfill compared to previous results. Furthermore, it has been observed that construction of composting plants can provide extra income through sales of recyclable materials and compost manure and thereby reduce the overall system’s running cost.Item Optimizing Schedules for School Bus Routing Problem: the Case of Dar Es Salaam Schools(International Journal of Advanced Research in Computer Science, 2014) Mushi, Allen R.; Ngonyani, B.; Mujuni, E.The School Bus Routing Problem (SBRP) deals with transportation of students to and from their schools. Given a set of fleet of buses of a school, a set of bus stops, the time matrix and the number of students at each stop, the task is to determine the schedule of buses that minimizes amount of time students spend in the buses on the way to and from school. The school bus routing problem is a special case of the Vehicle Routing Problem (VRP) and is known to be NP-hard. This NP-hardness implies that it is very unlikely that the problem can be solved in polynomial time. The common methods used to solve NP-hard problems are heuristic algorithms which gives quick and good solutions without guarantee that the solution obtained is optimal. In this paper a Tabu search based heuristic for SBRP is developed. The algorithm has been implemented using Borland C++ 4.5 programming language and tested using data from Tusiime Nursery and Primary School in Dar es salaam, Tanzania. The proposed implementation results in reduction of students’ travelling time by 19.24%.