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Expected Values of Aggregation Operators on Cubic Triangular Fuzzy Number and Its Application to Multi-Criteria Decision Making Problems
Aliya Fahmi,
Saleem Abdullah,
Fazli Amin,
Asad Ali,
Khaista Rahman
Issue:
Volume 2, Issue 1, June 2018
Pages:
1-11
Received:
26 December 2017
Accepted:
16 March 2018
Published:
31 May 2018
Abstract: In this paper, we define triangular cubic fuzzy numbers and their operational laws. Originated on these operational laws, approximately aggregation operators, with triangular cubic fuzzy weighted arithmetic averaging operator and weighted geometric averaging operator are suggested. Expected values, score function and accuracy function of triangular cubic fuzzy numbers are defined. Founded on these, an amicable of triangular cubic fuzzy multi-criteria decision making method is proposed. By these aggregation operators, criteria values are aggregated and integrated triangular cubic fuzzy numbers of alternatives are conquered. By relating score function and accuracy function values of integrated fuzzy numbers, a positioning of the entire option set can be accomplished. An example is given to appear the achievability and convenience of the process.
Abstract: In this paper, we define triangular cubic fuzzy numbers and their operational laws. Originated on these operational laws, approximately aggregation operators, with triangular cubic fuzzy weighted arithmetic averaging operator and weighted geometric averaging operator are suggested. Expected values, score function and accuracy function of triangular...
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Assessment, Determination and Modeling Effects of Infrastructural Decay on Rental Values in Nigeria (Case Study of Ehimiri, Agbama and Isieke Housing Estates)
Casmir Chidiebere Onyeneke,
Chibuzor Eguzouwa
Issue:
Volume 2, Issue 1, June 2018
Pages:
12-20
Received:
31 May 2018
Accepted:
12 June 2018
Published:
9 July 2018
Abstract: Housing accessibility and utilities constitute the intangible services available to a particular building by a community or any activity or groups of activities operated within the community. This research examines the effect of the decays in these infrastructures on rental values. The more accessible a dwelling is relative to other activity areas, the more useful will the dwelling be. Generally, infrastructural utilities include such goods and services as the provision of potable water, electricity, sewage, telephone, gas and roads. The provision of these utilities is not without cost and this cost is usually included in or forms part of the cost of housing. Many developing countries, particularly in Africa, accord relatively low priority to housing in their overall scheme of national development, and the volume of construction generally falls short of housing demands. The approach to housing policy in Nigeria has tended to oscillate between the welfare mixed economy and the free market model. The conventional wisdom is that governments should focus on providing good investment climates, infrastructure and mortgage facilities to low and middle income families. Nigerian cities are largely characterized by the public provision of urban infrastructural services such as electricity, water supply, drainage, sewage, access road and solid waste collection and disposal. The three tiers of government federal, state and local are often involved in one way or the other in the provision of these services in the urban centers. Although the provision of infrastructures such as roads and power supply lies with the government, communal efforts are still put together to fast track the process of making the infrastructures reach the people. Sometimes it is preferable not to wait for the government due to administrative bottlenecks and sometimes corruption by government officials.
Abstract: Housing accessibility and utilities constitute the intangible services available to a particular building by a community or any activity or groups of activities operated within the community. This research examines the effect of the decays in these infrastructures on rental values. The more accessible a dwelling is relative to other activity areas,...
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Fixed Set Point Weighting 2DOF PID Controller for Control Processes
Bahaaeldin Gamal Abdelaty,
Ahmed Hassan Ahmed,
Ahmed Nasr Ouda
Issue:
Volume 2, Issue 1, June 2018
Pages:
21-27
Received:
4 June 2018
Accepted:
21 June 2018
Published:
12 July 2018
Abstract: Nowadays, many of control systems need a flexible controller in order to achieve the operation requirement precisely and rapidly to overcome nonlinearity, uncertainty, digital implementation challenges, and achieving at the same time both of control system objectives of load disturbance rejection and set point following. This paper is aimed to design and analysis one of the most common industrial controllers, set point weighting 2DOF PID controller, to get this target with simplicity and effectiveness. The paper included the main problem description, structure of the proposed controller, effectiveness of controller parameters variations, the methodology of effective tuning method, and an example of the proposed controller on control system platform. The results reveal the accurate and effective operational performance of the proposed controller to obtain the control system objectives.
Abstract: Nowadays, many of control systems need a flexible controller in order to achieve the operation requirement precisely and rapidly to overcome nonlinearity, uncertainty, digital implementation challenges, and achieving at the same time both of control system objectives of load disturbance rejection and set point following. This paper is aimed to desi...
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Adaptation of Surface Rejuvenation Model to Turbulent Mass Transfer with Coupling Between Thermophoretic and Coulombic Force Interactions
Mingchi Chiou,
Chinghuang Chiu
Issue:
Volume 2, Issue 1, June 2018
Pages:
28-49
Received:
7 June 2018
Accepted:
27 June 2018
Published:
24 July 2018
Abstract: Development and applications of the surface rejuvenation model for particle transport towards the surface through turbulent boundary layer involve (1) the introduction of the constitutive equations to establish relations between the fluxes involved in mass transfer processes and the respective driving potentials, (2) the use of definition of the convective velocity to separate the mass transfer flux into diffusive and convective components based on Eulerian models of turbulent deposition proposed by Guha [1] and Young and Leeming [2], (3) the introduction of exponentially distributed functions given by Danckwerts [3] to transform the instantaneous transport properties into the mean domain prior to the solution of the conservation equations, and finally (4) the use of developed relationships for the mean concentration profile and mass transfer flux to obtained an analytical solution for the mean deposition velocity of neutral and charged particles. The deposition velocity of neutral particles with and without including thermophoretic effect is first calculated and then used to clarify the effects caused by the presence of external imposed electric field. A comparison with the experimental data and other theoretical predictions shows that the surface rejuvenation model is logical in finding the combined effect of thermophoresis and turbophoresis on the deposition of neutral particles and confirming the relative independence of deposition velocity upon these drift mechanisms at high values of particle inertia. When both thermophoretic and Coulombic forces operate together, two important conclusions are obtained from this model: (1) the contribution to particle deposition velocities does not represent the sum of these drift mechanisms considered in isolation; (2) the turbophoresis induces an additional drift velocity toward the wall in the vicinity of the wall, alleviating these external forces and enhancing particle deposition onto the wall through reduced build-up of particle concentration adjacent to the wall.
Abstract: Development and applications of the surface rejuvenation model for particle transport towards the surface through turbulent boundary layer involve (1) the introduction of the constitutive equations to establish relations between the fluxes involved in mass transfer processes and the respective driving potentials, (2) the use of definition of the co...
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Process Variables Optimization in Lapping of EN8 Material Using Taguchi Method
Rajesh Ramadass,
Saravanan Sambasivam
Issue:
Volume 2, Issue 1, June 2018
Pages:
50-55
Received:
30 May 2018
Accepted:
25 July 2018
Published:
12 September 2018
Abstract: The main aim of this work is to minimize the surface roughness in the flat lapping of EN8 material. The process variables considered for the study were lapping time, abrasive size and abrasive carrier oil proportion. The mathematical model related to the lapping such as surface finish model, stress model and its significance was understood. The (L9) orthogonal array in Taguchi method was utilized to conduct the experiments and surface roughness values were measured. The significance of each process variable on the surface roughness was studied using S/N ratio results. From the results, it was inferred that most influence factor among process variables is abrasive carrier oil proposition in slurry. Response table showed a delta value of 0.1967 for the abrasive carrier oil proposition in slurry. The optimum combination of process variables was determined based on S/N ratio and it was understood that minimum aluminum oxide abrasive proportion in slurry provides better surface quality in lapping of EN8 material. The optimum combination for minimum surface roughness were 15 minutes lapping time, 80 µm abrasive size and 1:3 abrasive carrier oil proportion in slurry.
Abstract: The main aim of this work is to minimize the surface roughness in the flat lapping of EN8 material. The process variables considered for the study were lapping time, abrasive size and abrasive carrier oil proportion. The mathematical model related to the lapping such as surface finish model, stress model and its significance was understood. The (L9...
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