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Hussanan A.,University of Technology Malaysia | Salleh M.Z.,University of Technology Malaysia | Khan I.,Majmaah University | Tahar R.M.,University Malaysia PahangPahang
Jurnal Teknologi | Year: 2016

This study investigates the unsteady heat transfer flow of a non-Newtonian Casson fluid over an oscillating vertical plate with Newtonian heating on the wall under the effects of thermal radiation. With the help of non- dimensional variables, governing equations are written into dimensionless form and then solved analytically by Laplace transform technique to find the solutions of temperature and velocity. The corresponding solutions of Nusselt number and skin friction are also calculated. The solution in term of viscous fluid is recovered as a limiting case of this work. The effects of the pertinent parameters on temperature and velocity are presented graphically and discussed details in this paper. © 2016 Penerbit UTM Press. All rights reserved.

Ahmed A.A.,University Malaysia PahangPahang | Jantan A.,Universiti Sains Malaysia | Wan T.-C.,Universiti Sains Malaysia
Computer Communications | Year: 2016

This study proposes a capable, scalable, and reliable edge-to-edge model for filtering malicious traffic through real-time monitoring of the impact of user behavior on quality of service (QoS) regulations. The model investigates user traffic, including that injected through distributed gateways and that destined to gateways that are experiencing actual attacks. Misbehaving traffic filtration is triggered only when the network is congested, at which point burst gateways generate an explicit congestion notification (ECN) to misbehaving users. To investigate the behavior of misbehaving user traffic, packet delay variation (PDV) ratios are actively estimated and packet transfer rates are passively measured at a unit time. Users who exceed the PDV bit rates specified in their service level agreements (SLAs) are filtered as suspicious users. In addition, suspicious users who exceed the SLA bandwidth bit rates are filtered as network intruders. Simulation results demonstrate that the proposed model efficiently filters network traffic and precisely detects malicious traffic. © 2015 Elsevier B.V. All rights reserved.

Sorooshian S.,University Malaysia PahangPahang
Industrial, Mechanical and Manufacturing Science - Proceedings of the 2014 International Conference on Industrial, Mechanical and Manufacturing Science, ICIMMS 2014 | Year: 2015

Reliability, being an inseparable part of any industry, also is a major issue in constructing industry. It is responsible for huge losses in capital investments and progress in the industry. This study was chosen to investigate the reliability of the building construction industry. To achieve this goal, questionnaires were distributed to thirty respondents based on literature and expert recommendation after which analysis was carried out on the Risk Priority Number (RPN) of delay sources. Based on the findings, this article introduces and tests a new index to analyse the risk-based reliability of the industries. The Risk-based Reliability Index (RRI) introduced and tested using found RPNs. The calculated RRI has the ability to play a benchmark tool role for industry reliability control. © 2015 Taylor & Francis Group, London.

Ainol D.,University Technical Malaysia Melaka | Raguvaran M.J.,University Technical Malaysia Melaka | Shajahan M.,University Technical Malaysia Melaka | Kadirgama K.,University Malaysia PahangPahang | Lajis M.A.,University Tun Hussein Onn Malaysia
International Journal of Applied Engineering Research | Year: 2015

Automobile Tyres are silent killers! No matter how well they are taken care, how good and expensive they are, they still leak-out 10-15 kPa of pressure every month, and this is equivalent of adding an unnecessary load of 70kg into the car. Properly maintained tyre pressure is known as one of the most essential factor for safe and economical motoring. The air from inside the tyre chamber normally escapes naturally through the tyre wall which is more permeable causing the tyre pressure to drop. Tyres which run below safe operating pressure value often lead to major road accidents due to catastrophic failure of these tyres. Most non-commercial vehicles are often continuously used with improper tyre pressure due to lack of awareness how much it is dangerous. Besidesbeing hassle to frequently checkand inflate the tyres manually, the malfunction of the air supply kiosks has also been the reason not to inflate frequently. Therefore, this paper presents of how the issue has been tackled and towards the end proposes a complete solution design of how a novel approach could sustain the tyre pressure without human intervention. Thus, not only the time and hassle to inflate could be overcome, but it reduces the risk of fatal accidents due to tyre explosion and save lives at large. © Research India Publications.

Gimbun J.,University Malaysia PahangPahang | Muhammad N.I.S.,University of Technology Malaysia | Law W.P.,University Malaysia PahangPahang
Chinese Journal of Chemical Engineering | Year: 2015

A detached eddy simulation (DES) and a k-ε-based Reynolds-averaged Navier-Stokes (RANS) calculation on the co-current spray drying chamber is presented. The DES used here is based on the Spalart-Allmaras (SA) turbulence model, whereas the standard k-ε (SKE) was considered here for comparison purposes. Predictions of the mean axial velocity, temperature and humidity profile have been evaluated and compared with experimental measurements. The effects of the turbulence model on the predictions of the mean axial velocity, temperature and the humidity profile are most noticeable in the (highly anisotropic) spraying region. The findings suggest that DES provide a more accurate prediction (with error less than 5%) of the flow field in a spray drying chamber compared with RANS-based k-ε models. The DES simulation also confirmed the presence of anisotropic turbulent flow in the spray dryer from the analysis of the velocity component fluctuations and turbulent structure as illustrated by the Q-criterion. © 2015 Elsevier B.V.

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