Johor Bahru, Malaysia
Johor Bahru, Malaysia

Universiti Tun Hussein Onn Malaysia is a public university in Batu Pahat, Johor, Malaysia. It was formerly known as Institut Teknologi Tun Hussein Onn and Kolej Universiti Teknologi Tun Hussein Onn . Along with other public university colleges, KUiTTHO was promoted to full university status. The name UTHM was officially launched by the then education minister, Dato' Seri Hishammuddin Bin Tun Hussein. UTHM also a member of Malaysian Technical University Network . Wikipedia.


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Chung Y.Y.,University of Sydney | Wahid N.,University Tun Hussein Onn Malaysia
Applied Soft Computing Journal | Year: 2012

The network intrusion detection techniques are important to prevent our systems and networks from malicious behaviors. However, traditional network intrusion prevention such as firewalls, user authentication and data encryption have failed to completely protect networks and systems from the increasing and sophisticated attacks and malwares. In this paper, we propose a new hybrid intrusion detection system by using intelligent dynamic swarm based rough set (IDS-RS) for feature selection and simplified swarm optimization for intrusion data classification. IDS-RS is proposed to select the most relevant features that can represent the pattern of the network traffic. In order to improve the performance of SSO classifier, a new weighted local search (WLS) strategy incorporated in SSO is proposed. The purpose of this new local search strategy is to discover the better solution from the neighborhood of the current solution produced by SSO. The performance of the proposed hybrid system on KDDCup 99 dataset has been evaluated by comparing it with the standard particle swarm optimization (PSO) and two other most popular benchmark classifiers. The testing results showed that the proposed hybrid system can achieve higher classification accuracy than others with 93.3% and it can be one of the competitive classifier for the intrusion detection system. © 2012 Elsevier B.V. All rights reserved.


Herawan T.,Universiti Malaysia Pahang | Deris M.M.,University Tun Hussein Onn Malaysia
Knowledge-Based Systems | Year: 2011

In this paper, we present an alternative approach for mining regular association rules and maximal association rules from transactional datasets using soft set theory. This approach is started by a transformation of a transactional dataset into a Boolean-valued information system. Since the "standard" soft set deals with such information system, thus a transactional dataset can be represented as a soft set. Using the concept of parameters co-occurrence in a transaction, we define the notion of regular and maximal association rules between two sets of parameters, also their support, confidence and maximal support, maximal confidences, respectively properly using soft set theory. The results show that the soft regular and soft maximal association rules provide identical rules as compared to the regular and maximal association rules. © 2010 Elsevier B.V. All rights reserved.


Stovin V.,University of Sheffield | Vesuviano G.,University of Sheffield | Kasmin H.,University Tun Hussein Onn Malaysia
Journal of Hydrology | Year: 2012

This paper presents new rainfall and runoff data from a UK green roof test bed which has been collected almost-continuously over a 29-month period from 01/01/2007 to 31/05/2009. Overall, the monitoring period was fairly typical of the location's long-term climatic averages, although the data set includes some extreme events in June 2007, which were associated with serious flooding locally. To focus on the system's performance under rainfall events likely to be of interest from an urban drainage/stormwater management perspective, return period analysis has been applied to identify those storm events with a rainfall depth in excess of 5. mm and a return period greater than one year. According to these criteria, 22 significant events have been identified, of which 21 have reliable runoff records. Overall the roof provided 50.2% cumulative annual rainfall retention, with a total volumetric retention equivalent to 30% during the significant events. The annual performance figures are towards the lower end of a range of international data, probably reflecting the fact that rainfall depths may be higher and evapotranspiration rates lower than in some more continental climatic settings. The roof's finite retention depth means that the maximum possible retention percentage declines as storm depth increases, and retention varied from between 0 and 20. mm, or 0% to 100%. Although some attenuation and delay of peak runoff is generally observed (mean peak flow reduction of 60% for the 21 significant events), the irregularity of natural rainfall patterns, combined with the variable influence of detention storage in specific events, makes the identification of peak-to-peak lag times difficult and arguably meaningless. Regression analyses have been undertaken to explore the potential to predict the roof's hydrological performance as a function of storm characteristics. However, these are shown to have poor predictive capability, even for the system from which they were derived. Through a detailed examination of data from three contrasting events, it is argued that the inter-event processes are too complex to be captured by this type of modelling approach. Instead, an understanding of the hydrological processes affecting the flux of moisture into and out of the substrate is required to explain the observed runoff response. Locally-derived evapotranspiration rates and the roof's observed maximum retention capacity are utilised to provide pragmatic guidance on the retention performance to be expected in response to selected design events. © 2011 Elsevier B.V.


Ahmad R.,University Tun Hussein Onn Malaysia | Bakar M.A.,University Tun Hussein Onn Malaysia
Materials and Design | Year: 2011

This work studies the effect of a post-weld heat treatment (PWHT) on the mechanical and microstructure properties of an AA6061 sample welded using the gas metal arc welding (GMAW) cold metal transfer (CMT) method. The CMT method was used because the method provides spatter-free welding, outstanding gap bridging properties, low heat input and a high degree of process flexibility. The welded samples were divided into as-welded and PWHT samples. The PWHTs used on the samples were solution heat treatment, water quenching and artificial aging. Both welded samples were cut according to the ASTM E8M-04 standard to obtain the tensile strength and the elongation of the joints. The failure pattern of the tensile tested specimens was analysed using scanning electron microscopy (SEM). A Vickers microhardness testing machine was used to measure the hardness across the joints. From the results, the PWHTs were able to enhance the mechanical properties and microstructure characteristics of the AA6061 joints welded by the GMAW CMT method. © 2011 Elsevier Ltd.


Omar S.S.,University Tun Hussein Onn Malaysia
International Journal of Economics and Financial Issues | Year: 2015

This paper seeks to empirically explore the dynamics roles of strong and weak ties within Muslim female entrepreneurs’ networks during critical problems (“tipping points”), and how this affects the subsequent performance of the small businesses. The literature review shows that many studies have explored the mix of strong and weak ties in small businesses linking them to stages of business development. More recent literature, however, has conceptualized firm growth through the notion of critical problems or “tipping points” that must be successfully tackled in order to continue on a development path. While the importance of network ties has been well documented in relation to growth stages, limited work has investigated the contribution that strong and weak ties make as a firm faces specific “tipping points,” thus showing a call for further investigation. This is a qualitative study involving four cases of small-sized food manufacturing firms in the Southern region of Malaysia. The main data collection method is an in-depth interview with the owner-managers using critical incident interview technique. The triangulation of data has been carried out by interviewing individuals who are seen as strong and weak ties of the network. They suggest that the dynamics roles of strong and weak ties are essential during the “tipping points.” The findings have implications for firms, networks and the government. It also provides a detailed understanding on the nature of entrepreneurial network of entrepreneurs in Malaysia. Recommendations are presented that address the need to support small businesses in dealing with critical problems in relation to their networking practices. © 2015, Econjournals. All rights reserved.


Sulaiman E.,University Tun Hussein Onn Malaysia
2011 5th International Power Engineering and Optimization Conference, PEOCO 2011 - Program and Abstracts | Year: 2011

Permanent magnet flux switching machine (PMFSM) with additional field excitation coil (FEC) has several attractive features compared to conventional permanent magnet (PM) machines because of its variable flux control capability and robust rotor structure suitable to apply for high speed applications. However, the original machine has a limitation of operating in high current condition due to nonessential magnetic saturation that prevents the machine from extracting the maximum performances. To overcome this problem, some design refinements are conducted by using deterministic optimization method to gain a better performance in the maximum torque and power production. The results simulated by finite element analysis (FEA) show that the machine with the improved design increases by 11.6% of the maximum torque and 16.3% of the maximum power compared to the original design. © 2011 IEEE.


Chan C.-M.,University Tun Hussein Onn Malaysia
Environmental Earth Sciences | Year: 2014

Ground improvement with soil solidification has been widely applied and has proven to be an effective pre-treatment of soft soil deposits. The solidification procedure usually involves addition and thorough mixing of hydraulic binders with in situ soils, consequently transforming the soft materials into a stronger and stiffer stratum for load bearing. Much has been done on the binder's effectiveness and resulting enhanced properties of the soils, but not as much has been reported of the factors governing in situ mixing efficiency in producing uniform mixtures. While advancement in machinery and computerization of operations have significantly improved soil mixing, individual factors contributing to the process can be further examined to refine the effectiveness. This paper describes a series of laboratory tests, mainly unconfined compressive strength tests complemented with X-ray computer tomography, conducted on cement-stabilized dredged Kawasaki clay of different uniformities. A number of factors affecting uniformity were examined, namely the water/cement (WC) ratios, number of cement layers in the initial state as well as the number of mixing cycles adopted. Test specimens were prepared based on a systematic combination of these factors to enable a comprehensive cross-analysis of the results. It was found that the clay's initial consistency was markedly altered by cement addition, which resulted in either enhanced or reduced workability of the mixture. While increased mixing vigor could apparently overcome poor distribution of binder in the mixture, the resulting strength remained very much affected by the WC ratio, suggesting dependency of the mixture's overall uniformity on a combination of the factors. © 2013 Springer-Verlag Berlin Heidelberg.


Fulazzaky M.A.,University Tun Hussein Onn Malaysia
Chemical Engineering Journal | Year: 2011

Adsorption is one of the important techniques in separation including the use of activated carbon to remove organic micropollutants from water in treating of drinking water production. Although the adsorption processes to remove contaminant from water have been used widely, the models to describe in detail the adsorption mechanisms need to be formulated. This paper uses the relation [kLa]f=[kLa]ge-βq to develop the mathematical models to determine the resistance of mass transfer. Parameters in equations are all physically meaningful, experimental data validation shows that the equations remained accurate. The global, external, and internal mass transfer factors are analyzed to contribute to adsorption mechanism investigation. The resistances of mass transfer for adsorption of the different surfactants onto granular activated carbons are verified. © 2010 Elsevier B.V.


Fulazzaky M.A.,University Tun Hussein Onn Malaysia
Environmental Monitoring and Assessment | Year: 2010

Water quality degradation in the Citarum river will increase from the year to year due to increasing pollutant loads when released particularly from Bandung region of the upstream areas into the river without treatment. This will be facing the problems on water quality status to use for multi-purposes in the downstream areas. The water quality evaluation system is used to evaluate the available water condition that distinguishes into two categories, i.e., the water quality index (WQI) and water quality aptitude (WQA). The assessment of water quality for the Citarum river from 10 selected stations was found that the WQI situates in the bad category generally and the WQA ranges from the suitable quality for agriculture and livestock watering uses to the unsuitable for biological potential function, drinking water production, and leisure activities and sports in the upstream areas of Saguling dam generally. © 2009 Springer Science+Business Media B.V.


Sulaiman E.,University Tun Hussein Onn Malaysia
2012 IEEE International Power Engineering and Optimization Conference, PEOCO 2012 - Conference Proceedings | Year: 2012

This paper presents design study of high torque and high power density hybrid excitation flux switching synchronous motor (HEFSSM) as a candidate for traction drives in hybrid electric vehicle (HEV). Firstly, the construction, the basic working principle and the design concept of the proposed HEFSSM are overviewed. Then, under some design restrictions and specifications for the target HEV applications, the initial drive performances of the proposed HEFSSM are evaluated based on 2D-FEA. As the initial motor fails to achieve the target performances, design parameters are set and treated by using deterministic design optimization approach. After several cycles of optimization, the proposed motor makes possible to obtain the target performances of 333Nm torque and 123kW power similar to that used in existing interior permanent magnet synchronous motor (IPMSM) for LEXUS RX400h. © 2012 IEEE.

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