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Exploring student perception on the implementation of collaborative learning in electronic circuit and system course
No full textThe 21st century learning environment has been moving towards student-centered learning, and one approach is collaborative learning. Collaborative learning can positively impact on students' engagement and provides an opportunity for students to work in a team. This study presents an attempt to explore students' perceptions of collaborative learning involving the content of knowledge, motivation, and team working skills. The collaborative activity was implemented in Electronic Circuit and System (ECS) course on voltage regulator topic. Results show that the collaborative activity able to improve students' content of knowledge, learning motivation intrinsically as well as team working skills. The collaborative learning strategy provides a mechanism for students to build a positive relationship with each other and provide an experience that can maximized student learning
The influence of emotional intelligence on employee’s job performance in the southern state of Malaysia
No full textThis study aims to investigate whether emotional intelligence was related to job performance among the operators in one manufacturing company in Johor. Emotional intelligence was measured by the Emotional Intelligence Scale, while job performance was assessed by Individual Work Performance Questionnaire (IWPQ). Data for this study were collected from 118 operators of one manufacturing company in the southern state of Malaysia. The findings show that the level of emotional intelligence was found moderate while the level of job performance was found high. The result from Smart PLS shows that there is a significant moderate correlation between emotional intelligence and job performance among the operators. The findings indicate that emotional intelligence has a relationship with job performance. A few recommendations were suggested that are organization can improve the low level of emotional intelligence by training intervention and the organization also needs to create awareness by initiating a program about emotional intelligence for the employees. Suggestions were also provided for future research including collecting data from the perspective of employees and employers about the studied variables
Analyzing the effects of corona ring material and dimensions on the electric field distribution of 132 kV glass insulator string using 2-D FEM
No full textInsulators are highly important in high voltage transmission lines for their ability to regulate the amount of current flowing through the entire line. However, these insulators are vulnerable to electrical discharges such as current leakage, and corona under high voltage conditions. These phenomena cause the insulators to deteriorate overtime which makes them susceptible to breaking down. The paper analyses the effects of corona ring material and dimensions on the electric field distribution of the 132 kV glass insulators. The electric field distribution was calculated using a numerical method known as Finite Element Method where the analysis was done with its corresponding software, and the simulation utilizes a two-dimensional insulator string model. The results show that the installation of corona rings significantly improves the electric field distribution of the insulator string leading to a decrease in electric field of the highly stressed regions by 75%. Meanwhile, a lower installation height for the corona ring would improve the overall electric field distribution of the insulators. A higher installation height would cause the electric field to be less evenly distributed along the string. On the other hand, a higher ring diameter would worsen the field distribution where there was an increase in electric field of up to 54.1% at the bottom and the top of the string
Fuzzy logic control for quadrotor micro-aerial vehicle altitude and attitude stabilization
No full textThis paper presents a fuzzy logic controller (FLC) for altitude and attitude stabilization of a quadrotor micro-aerial vehicle (MAV). The MAV is a small vehicle that weighs less than 0.1 kg; therefore, a slight perturbation will affect its performance. Hence, for the actuated dynamics, roll (ϕ), pitch (θ), yaw (ψ), and altitude (z) stabilization, a FLC scheme is proposed. A 3 × 3 heuristics rules is used with error and derivative error as the inputs. In addition, five memberships function is created for the output comprise of triangles type and sigmoidal type. In this Mamdani-model, centroid is chosen as the defuzzification process. All individual gains for the FLC are tuned manually until achieving the desired responses. The Newton–Euler model of quadrotor is simulated using Simulink with a slight force perturbation which is applied on the altitude (z) to investigate the system performances. The simulation result shows that the flight control scheme provides good performance in the presence of perturbation
Should we maintain baby hatches in our society? Baby hatch policy in Malaysia
No full textEvery year there is news of newborn babies being abandoned in places like toilets, garbage dumps, sewers, etc. It is believed that the mortality rate of abandoned babies in Malaysia is 70%, which means that for every 10 babies abandoned, only 3 survive. Accordingly, the governance aspect of baby dumping should also be explored, especially in terms of guiding policies to address issues and problems related to baby abandonment in Malaysia. This study, therefore, sought to inform the public about the establishment of a baby hatch, and then obtain input and further information to analyze the requirements for the government to develop a guiding policy for the baby hatch program in Malaysia. The purpose is to explore the policy aspect of using baby hatches as a solution to the problem of baby abandonment. An interview was conducted with the Advocacy and Communications Manager of OrphanCare. From the findings obtained, it appears that in order to address this problem, a support should be given to baby hatches taking into account four elements; Collaboration and cooperation between NGOs and government agencies, awareness programs for target groups, regulatory and legal protection, and, finally, introduce a policy for deinstitutionalization of baby hatches. Thus this is crucial to provide suitable suggestions and policies for planning the next steps to overcome the problem of abandoned babies in the future
A simple energy management system for a micro grid system using rule-based algorithm
No full textIt is an interesting privilege if electricity consumers can use electrical energy more effectively and economically without sacrificing their needs and luxuries. With energy management system (EMS) in a smart home that supplied by grid and supported by alternative energy sources, more efficient, green-friendly, and economic energy can be obtained. To ensure this, it is a need to develop a reliable energy management algorithm for smart home. In this study, a simple energy management using Rule-Based Algorithm is proposed which could respond to user’s preferences, thus benefiting the user optimally. To meet those needs, an EMS using Rule-Based Algorithm for a grid-connected smart home, which supported with solar panel and battery is demonstrated. Also, in the proposed EMS, the state of charge (SOC) of battery will be controlled by the means of to protect the battery’s life cycle. Rule-Based Algorithm considered in this study has considered three main features: SOC of the battery, price-hourly and the load demand. The proposed system is simulated using Arduino IDE and Proteus Design Suite Software, before validated by a simple prototype to prove the rules functionality. From the results, it has shown that the proposed algorithm able to switch the grid, solar and battery sources well, besides offering lower energy bills without forfeiting their desires
A study on the arrival time of ultrasonic waves in concrete material
No full textConcrete is one of the most critical materials being used in construction project. Ultrasonic testing is a conventional non-destructive test method, that is adopted to evaluate the condition and quality of concrete structure. This is important to ensure the strength and resilience of built structures. This paper aims to assess the arrival time of the ultrasonic waves in concrete structure by employing ultrasonic through-transmission method. A simulation study was performed in COMSOL Multiphysics software. Data were collected and structured into three sections, including in homogenous concrete model, as well as concrete model with inclusion of air voids and cracks. This study investigates the influence of size of air voids and position of cracks on the arrival time of the received ultrasonic signal. The waves diffraction at the defects increase the arrival time of the received signal
Model reference adaptive controller design for electrohydraulic actuator system with varying disturbance
No full textThe objective of this study is to design and analyze the performance of the designed controllers on the presence of varying mismatched disturbances. This research provides a clear the selected approaches for the controllers’ design implementation of the electro-hydraulic actuator (EHA) system, an adaptive controller, the Model Reference Adaptive controller (MRAC). Subsequently, this research is considered another controller, the Proportional Integral Derivative (PID) for comparing the best control performance for the electro-hydraulic actuator system with varying mismatched disturbance. PID controller has been tuned by using two different tuning techniques. The Trial-and-error and Ziegler-Nichols tuning method have been proposed for attaining the desired control system response in this research. Simulation results show that the MRAC provides the best response performance among the designed methods for every specific disturbance setting at 0 N, 5000 N and 10,000 N. The MRAC method dominantly achieves the faster response in rise time for every disturbance respectively
Enhancing social interaction of research incubator in Malaysia through integrated spaces
No full textTypical research facilities particularly research incubators in Malaysia are lacking in certain areas in which it limits social interactions between users. This can lead to segregation between communities where the researcher's community is isolated from their surrounding communities. This is seen through a building appraisal of the current research incubators within Malaysia. These research incubators seem to be lacking in terms of utilizing the surrounding context to promote the research & development for its end-users, particularly in terms of the social aspect. This is due to the problem of urban sprawl as the facilities and the people are far from each other which can be seen through using urban studies where the land uses is the cause of the incubators being separated from the community. The lack of interaction with the surrounding community itself can be the cause of a community of researchers becoming isolated when looking at the social aspect. In the architectural aspect, the research incubator buildings do not contribute to creating interaction between these communities as the activities at the street level are none existence with no proper public spaces that can be used to help with the sociability and also lacking in terms of its legibility as the building is easily forgettable. The study aims to find integrated spaces to enhance social interaction for research incubators in Malaysia by making comparisons between existing incubators. This is to understand the reasons for the lack of social interaction within existing research incubator programs by proposing an integrated program that can enhance the current building program. The methodology of the dissertation is a qualitative method of literature review and case studies. The case studies and literature review will help in summarising the spaces within an existing research incubator that can help improve the social interaction and highlight the spaces to have for an integrated building program. This led to a conclusion that having a more permeable ground level with accessible spaces due to good infrastructure, more common areas within the building itself, wider circulation spaces, and seating areas at the landscaping can help in the design of a research incubator with an integrated space to enhance social interaction. Finally, this research may benefit the future design of a new configuration of research incubators in Malaysia
Energy harvesting by exploiting vortex-induced vibration from a modified cruciform structure
No full textFrom off-grid charging of electronic devices to energising independent wireless sensor networks, the demand for stand-alone, low-power generators from renewable energy sources is becoming more prevalent. A cruciform energy harvester has been shown to output consistent power in the order of 1 mW when the reduced velocity U*, exceeds 15. However, this output is insufficient and its onset too late for realworld applications. Thus, this study seeks to remedy these two shortcomings by investigating cruciforms oscillators at various cruciform angles. To fulfill these goals, the Reynolds-Averaged Navier-Stokes simulation were performed, and the results for the 90° cruciform were compared against experimental data for validation. The experiment uses a similar 90° cruciform in an open flow channel. Assessments were made on the vibration amplitude, frequency, lift amplitude and lift frequency at cruciform angles 90°, 67.5°, 45°, 22.5° and 0°. The Reynolds number range was 1.1x103 Re ≤ 14.6x103 and Scruton number 9.94, which was consistent with similar studies. Hilbert-Huang analysis of the 90° cruciform indicated that a lot of energy from the free stream was wasted in the production of non-performing Karman vortices. A larger lift was possible if streamwise vortices were produced instead. When 45 ≤ a(°) ≤ 67.5, asymmetries in the vortical structures prevented high-amplitude vibrations from taking place. However, when 0 ≤ (°) ≤ 22.5, a high-degree of symmetry among the vortical structures led to an early onset of high-amplitude vibration. Power generated by the cruciform was in the order of 1 mW for a 90° cruciform, below 1m Wwhen 45 ≤ a(°) ≤ 67.5, and in the order of 10 mW when 0 ≤ a(°) ≤ 22.5. Unification of the power generation and energy harvesting efficiency results produced a map that describes the power and efficiency of the harvester in the a(°)-U* parameter space. This uncovers three distinct regions of power generation: pure cruciform region as cruciform angle tends to 90°, steep-angle region between 45 ≤ a(°) ≤ 67.5, and shallow-angle region between 0 ≤ a(°) ≤ 22.5. Maximum efficiency occurs close to 0.8 m/s when cruciform angle is 90°, close to 0.2 m/s at 67.5°, and close to 0.4 m/s at 0°. This power and efficiency map makes it possible for future engineers to tailor the design of their cruciform energy harvester to their specific power and efficiency needs