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Search Results: 1 - 10 of 262900 matches for " E.O. Oyetunji "
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Some Common Performance Measures in Scheduling Problems: Review Article
E.O. Oyetunji
Research Journal of Applied Sciences, Engineering and Technology , 2009,
Abstract: In this Study, we discussed 29 different scheduling criteria. We developed mathematical expressionsfor all the criteria considered. Each of the criteria was expressed as a function of either the completion time ofjob or the given parameters. This will assist researchers to easily compute the value of any of the schedulingcriteria considered in this study.
Hierarchical Minimization of Total Completion Time and Number of Tardy Jobs Criteria
E.O. Oyetunji,A.E. Oluleye
Asian Journal of Information Technology , 2012,
Abstract: In this study, the single machine bicriteria scheduling problem of hierarchically minimizing the total completion time of jobs (Ctot) and number of tardy jobs (NT) with release time was explored. Two types of hierarchical minimization models (the case of the total completion time criterion being more important than the number of tardy jobs criterion and the case of the number of tardy jobs criterion being more important than the total completion time criterion) were discussed. Three heuristics (HR4, HR5 and HR6) selected from the literature were used to test the models.
Utility of Meta-Heuristics for Solving Scheduling Problems
E.O. Oyetunji,A.E. Oluleye
Journal of Engineering and Applied Sciences , 2012,
Abstract: Meta-heuristics, are increasingly being applied by many researchers to solve scheduling problems. In this study, we discuss 5 unique characteristics of meta-heuristics that have endeared them to researchers. These are: ability to escape local optima, obtain better solution quality, solve larger instances of problems, suitable for multi-objective scheduling problems and have wide applicability.
Heuristics for Minimizing Total Completion Time and Number of Tardy Jobs Simultaneously on Single Machine with Release Time
E.O. Oyetunji,A.E. Oluleye
Research Journal of Applied Sciences , 2012,
Abstract: In this study, the problem of simultaneously minimizing the total completion time and number of tardy jobs with release dates on a single machine is investigated. Three heuristics (called HR4, HR5 and HR6) were proposed for the bicriteria problem and were compared with the branch and bound (BB) procedure in order to evaluate effectiveness. Computational experiments, focusing on both the effectiveness (a measure of the closeness of the value of the performance measure) and efficiency (a measure of the execution time or speed) of the solution methods, were presented.
The Total Completion Time: An Important Performance Measure in Scheduling
E.O. Oyetunji,A.E. Oluleye
International Journal of Soft Computing , 2012,
Abstract: Given the problem of scheduling n jobs with release dates on a single machine, we prove that any solution method that minimizes the total completion time (Ctot) also minimizes total flow time (Ftot), total lateness (Ltot), average completion time (Cavg), average flow time (Favg) and average lateness (Lavg). Two approaches (Analytical and Experimental approaches) were adopted to prove this conjecture.
Enhancing and Optimizing Operating Systems: A Case Study of Windows XP
E.Y. Baagyere,E.O. Oyetunji
Asian Journal of Information Technology , 2012,
Abstract: The windows registry provides an extensive range of tweaks, tricks and hacks for optimizing, enhancing and securing windows. When, it comes to optimizing and enhancing windows, no other tool comes close to the Registry Editor (RE). In this study, we outline several comprehensive procedures for enhancing and optimizing the performance of windows with emphasis on windows XP. We believe these outlines will help computer users especially system administrators, to make a maximal use of the computer resources.
Minimizing Maximum Stretch on A Single Machine with Release Dates
G.J.Oyewole, A.E. Oluleye, E.O. Oyetunji
Advances in Management and Engineering , 2014, DOI: 10.7508/AIEM-V3-N1-1-12
Abstract: This paper considers the scheduling problem of minimizing the maximum stretch on a single machine with release dates. The need to give importance to short jobs in interactive environments where jobs with long and short processing times are involved creates a Scheduling problem. Also this problem, is by nature NP-Hard (difficult to achieve optimal solutions in good time).Hence, the John Gbeminiyi Oyewole 1(JGO1) heuristic was developed to solve this problem. JGO1 heuristic and two other solution methods selected from the literature (First in First out (FIFO) and Branch and Bound (BB)) were tested on 1400 randomly generated problems. Twenty Eight different problem sizes ranging from 3 to 500 jobs and 50 problem instances under each problem size were generated. Performance evaluation was based on effectiveness and efficiency of the solution methods. Experimental results based on effectiveness show that JGO1 performed competitively with the BB method (BB not significantly different from JGO1 at 5% level), but far better than FIFO for 3 to 500 problem sizes. However, the JGO1 achieved a lesser mean best-result than the BB method. Based on efficiency, JGO1 and FIFO were faster than the BB method but not significantly different from each other at 5% level.
Salt (Electrolytes) Sorption By Membranes And/Or Ion-Exchange Resins: Donnan Or Partition Equilibrium?
Anales de la Asociaci?3n Qu?-mica Argentina , 2005,
Abstract: the sorption equilibrium of salts (electrolytes) between aqueous solutions and ionexchanging phases (membranes, resins, and/or gels) is analysed. classically this equilibrium had been treated as donnan equilibrium with unitary constants (teorell (1953), schloegl (1964)). however, as phases of different structure and different thermodynamic standard states are involved a partition equilibrium with non-unitary constants is the correct thermodynamic description, as it is used, p.ex. in the solubility-diffusion theory of membrane processes. surprisingly a complete thermodynamic description of such equilibrium has not been given. stating the thermodynamic phase equilibrium conditions directly for the salts (not for ions) and taking into account the molarity (x) of fixed ions in the ion exchanging phase (accountable of the characteristic ion exclusion effect) a limiting sorption law for a binary salt of type m ν1yν2 is obtained (indices: 1 = counter-ion, 2 = co-ion within the sorbing phase): , (qs = ν2 |z2| cs/x; cs = salt molarity in the membrane; external molal salt activity) law which depends on the salt formula (relation ν1/ ν2) and the membrane characteristics. experimental sorption data of different salt/membrane systems (nabr/nar; csbr/csr; srbr2 /srr; mgcl2 /rcl; mgcl2 /mgr; lacl3 /lar; na2so4 /nar) follow this law. in log-log graphs of qs vs. the experimental exponent ns coincides with its theoretical values (1+ ν1/ ν2). the partition constants are also obtained as well as the activity coefficient of the salt within the sorbing phase. it is found that this coefficient (>1) is logarithmically linear in √(is), the ionic strength of the salt in this phase. finally the complete sorption equations for qs are solved, i.e. eqs. of 2nd. degree (symmetric electrolytes) and of 3rd. degree (1:2 electrolytes), the latter being treated in detail. the expressions of the partition factors of the counter-ion and of the co-ion are also obtained as well as their limiting expressio
Kinetics of ethane hydrogenolysis on Os3 (CO)12/Al2O3 catalyst
E.O. Odebunmi
Bulletin of the Chemical Society of Ethiopia , 1996,
Abstract: Bull. Chem. Soc. Ethiop. 1996, 10(2), 143-151.
Quantitative leaching of galena
E.O. Olanipekun
Bulletin of the Chemical Society of Ethiopia , 2000,
Abstract: (Received September 25, 1999; revised January 19, 2000) Experiments on the quantitative leaching of lead from galena in hydrochloric acid solutions are reported. The effects of contact time, acid concentration, number of leaching stages, solid to liquid ratio, particle size, temperature, and stirring speed, on the leaching reaction are reported. About 96% of lead was dissolved within 120 min by 8.42 M hydrochloric acid solution at 95 oC. Multi-stage leaching was not so advantageous, but the extent of leaching increased greatly with temperature. The optimum solid to liquid phase ratio and particle size were found to be 1/30 kg/L and -88+53 m, respectively. Dissolution was enhanced by stirring speed over the range 0 to 400 min-1 and reached a steady rate thereafter. Bull. Chem. Soc. Ethiop. 2000, 14(1), 25-32 Bulletin of the Chemical Society of Ethiopia. ISSN: 1011-3924
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