bluuebunny/crossref_metadata_2025 huggingface dataset:
The Development of a Web-Based Student Support System Using Java Server Pages and MySQL
Authors: M. Razif J., M. , Aisar M. M. I. , Fauzi S. S. M. , M. Nabil F. J. , Gining R. A.JM. , Suali A. J. , Sobri W.A.W.M.
Published: June 2020

This paper details the development of web-based student support system which is known as Postgraduates Information System (PGIS). The system was developed to contend with some of the constraints of manual input. The current system utilizes Microsoft Excel which carries several disadvantages such as lack of control, susceptible to human error, and prone to data inconsistency. A Modified Waterfall Model was the methodology used for this project as the scale of this system was not too large and rather straightforward. This system was developed using Adobe Photoshop, NetBeans IDE, MySQL Server and Apache Tomcat. The system was tested using functional testing and usability test. From the tests conducted, the feedbacks were positive except for some minor adjustments to be made in managing faculties and programs.
Analytical prediction of initiation of ferroresonance modes
Authors: Sa’ad Haji Bini M , Ang S P , Yeo K S K , Khalil A , Jaafar S
Published: June 2020

This research focuses on the impact of basic circuit parameters to the initiation of characteristic ferroresonance modes, which is a non-linear phenomenon, in single-phase power transformers. This non-linear phenomenon is investigated using an equivalent circuit of the transformer together with a circuit simulation. The basic circuit parameters investigated were iron core loss, circuit capacitance, and the source voltage. A mathematical method is used to calculate the critical boundary values of each parameter to avoid the occurrence of ferroresonance in the system. In this paper, an analytical method was used to predict the occurrence of ferroresonance while Matlab/Simulink simulation was used to determine the different ferroresonance modes in the power transformers. By varying the circuit parameters, different ferroresonance modes are observed and discussed.
Mechanical and Morphology Studies of Bioplastic-Based Banana Peels
Authors: Azieyanti N A , Amirul A , Othman S Z , Misran H
Published: June 2020

The limitation of oil has been an intermittent worry in plastic production nowadays. One of the sources of plastic production is fuel. However, the synthetic plastic cause harm to the people and the environment. It has contributed as one of the major cause pollution to the surface of earth. Therefore, new alternative for the production of plastic have been studied. This study is conducted mainly to develop a bioplastic from food waste, banana peels. The additives used together with banana peels are natural-based materials such as corn starch, potato starch and sage while the chemical-based materials used consist of hydrochloric acid and sodium hydroxide. The addition of glycerol is used to increase the plasticity characteristic. From tensile properties results, it indicates that the banana peels bioplastic with chemical-based show high tensile strength and elongation at break compared to natural-based. However, the modulus of elasticity of bioplastic with natural-based retrieved the highest results. The scanning electron microscope (SEM) of tensile fracture surface shows that the additive is well dispersed with banana peels as matrix with good bonding and better adhesion.
Environmental Modelling through Chaotic Approach for Malaysian West Coast Sea Level.
Authors: Ali Nazliah Mohd , Hamid Nor Zila Abd
Published: June 2020

Sea level forecasting is an essential task for coastal engineering, geodetic application, navigation, and recreational activities. Predicting the behavior of future sea level is important for monitoring and forecasting of changes in fishery and marine ecosystems as well as for protection of coastal. This research is focused on the analysis and prediction of hourly sea level time series data at the benchmark station located in Penang by using chaotic approach. The purpose of this research was to identify the presence of chaotic behavior by the phase space reconstruction and Cao methods, and also a local linear approximation method is applied for prediction purposes. The results notified that the value of correlation coefficient between the observed and predicted time series is 0.8838 which is near to one. This reveals that the local linear approximation method can be used to predict the sea level time series in Malaysia. Certainly, the result of this research is expected to help stakeholder such as Department of Survey and Mapping Malaysia (JUPEM) in having a better sea level management.
Case study on Designing a Comprehensive Fire Protection System for KY Power Station
Authors: Yusoff Y F , Mohd-Lair N A , Tsen M , Harman M
Published: June 2020

The KY Power Station relies on two gas turbines to generate electrical energy. In addition, fuel storage is also required to ensure uninterrupted power supplies. As a power generation plant and the existence of fuel storage, an efficient fire protection system is essential. This paper presented a comprehensive review of the existing research on fire protection systems. Utilising the reviewed as basis, this paper also described the five types of KY Power Station fire protection systems as the case study. Specifically, the five fire protection systems are; Water Spray Fixed System, Foam Protection System, Automatic Carbon Dioxide Extinguishing System, Pressurized Fire Hydrant and lastly Automatic Fire Detection and Alarm System. Even though a station may require more than one fire protection systems as illustrated by the case study, this paper observed that the existing researches focused mainly on designing the individual system of different fire protection system according to standard. This paper found that there is lacked of research on optimising these individual fire protection systems. The optimisation usually requires development of mathematical model. Therefore, there is a need for development of mathematical model for the individual fire protection system. These different types of fire protection systems are independent but they are equally important. Thus, there is also a need to look into global optimisation in designing the fire protection system.
Performance of Bamboo and Steel Reinforced Concrete under Flexural Strength
Authors: Rahman P E H Ab. , Malek N J A , Bahari Mohd Hanizan Bin , Hassan R
Published: June 2020

As well known, concrete and steel are widely used in construction industry due to its strength and durability. The usage of these materials is threatening the environment as steel and concrete are non-renewable sources and the productions were consuming largest energy in construction industry. In order to overcome this problem some studies were conducted by different researchers in replacing steel with bamboo in structural components such as beam, column, slab and others. Therefore, in this study, the usage of bamboo as the replacement for steel reinforcement in concrete covering slab is tested. The flexural strength of bamboo reinforced concrete covering slab for 100 mm x 50 mm and 100 mm x 100 mm meshing were tested under four-point load. The result of comparison of flexural strength between steel reinforcement and bamboo meshing shows that the steel reinforcements have more flexural strength than bamboo meshing with percentage difference of 40.95% for 100 mm by 100 mm meshing opening and 62.37% for the 100 mm x 50 mm meshing opening size. From the experiment, it shows that slab cover with steel reinforcement has higher bending strength that the bamboo reinforced. The brittle behaviour of bamboo cannot compete with steel with higher elasticity.
Electrical Technology Students in Vocational Colleges: Are They Healthy Mentally?
Authors: Lee M.F. , Sulaiman K.A. , Lai C.S.
Published: June 2020

Distraction such as depression, anxiety, and stress in mental health problem can influence academic achievement to students, including vocational colleges’ students. Hence, the main purpose of this study was to determine the mental health profiles of Electrical Course students in Vocational Colleges. The difference in mental health level in terms of gender, hometown, and years of study were also be investigated. Besides, the level of mental health elements implementation by teachers in teaching and learning was also determined. This study was employed a survey method as research design that involved of 132 respondents from three vocational colleges in the southern zone. The respondents were selected using strata sampling technique. The instrument of this study was Malay version DASS-21 item inventory. This inventory measures three elements of mental health problem, namely depression, anxiety, and stress through 21 items. Questionnaires for level of mental health elements implementation by teachers in teaching and learning from student perception consists of 21 items. The collected data were analyzed using frequency, percentage, Spearman Rho test, Mann Whitney U test, and Kruskal Wallis test. The findings of this study showed that students’ mental health level and the level of mental health elements implementation by teachers in teaching and learning were at the moderate level. The findings also found that there was a significant relationship between each element of mental health with students’ academic achievement level, as well as the level of mental health elements implementation by teachers in teaching and learning. In addition, the results also shows that there were no significant difference in the mental health level among the students from the aspects of gender, hometown, and years of study. In short, an intervention program needs to be implemented to overwhelm students’ mental health problems, because prevention was better than cure.
68 MHz Fundamental Repetition Rates for Mode-Locked Erbium Doped Fiber Laser based Carbon Nanotube Saturable Absorber
Authors: Rifin S N M , Munajat Y , Razak S N A , Zulkifli M Z , Ahmad H
Published: June 2020

A carbon nanotube thin film as saturable absorber in a cavity design of mode-locked fiber laser is reported in this work. Measured by power dependent absorption setup, 22% modulation depth of the saturable absorber is estimated which is ideal for stabilizing the mode-locked operation. Based on the scanning image from atomic force microscope (AFM), Single wall carbon nanotube components are identified existed in the thin film. The laser cavity employed a ~40 cm long erbium doped fiber as a gain medium which corresponds to the laser wavelength of 1550 nm (telecommunication wavelength region). Total length cavity of the fiber laser is about 3.1 m where shorter cavity design is required for higher repetition rate. This proposed system result in a firm soliton spectrum at centre wavelength of ~1561 nm with ~0.7 mW average output power and pulse duration of 410 fs. The pulses are generated at fundamental repetition rate of 68 MHz without any distortion and excellent spectral quality.
Life Cycle Assessment of Interlocking Compressed Earth Brick and Conventional Fired Clay Brick for Residential House
Authors: Asman N S A , Bolong N , Mirasa A K , Asrah H
Published: June 2020

The conventional fired clay brick (FCB) is a significant building material in the construction industry. However, Besides, the construction field nowadays is designed and constructed without the considerations on the environmental impacts. Thus, the interlocking compressed earth brick (ICEB) was introduced replacing the conventional brick where the brick is not fired, thus contribute to carbon emissions reduction and in line with environmental issues regarding air pollution and global warming. In this paper, a comparative study on Life Cycle Assessment (LCA) is carried out for a residential house using conventional FCB and ICEB as the wall system by focussing on the global warming potential (GWP) impact. The adoption of the ICEB in green building construction can lower energy consumption and reduce the overall environmental impact and has the potential in carbon footprint reduction.
PRIORITIZING SUSTAINABILITY IMPACT OF FAILURE MODE AND EFFECT ANALYSIS IN THE PALM OIL MILL USING ANALYTICAL HIERARCHY PROCESS
Authors: Mahmood W.H.W. , Abdullah I. , Fauadi M.H.F., Md , Rahman M.N.A. , Halim M.F. M. , Said M.A. , Sabri M.S.M.
Published: June 2020

This paper presents an Analytical Hierarchy Process (AHP) model for prioritizing multicriteria sustainability impact of Failure Mode and Effect Analysis (FMEA). It focuses on the Malaysian palm oil mills that have been widely criticized on various sustainability issues. The data collection for pair-wise comparison of decision judgement are taken from three experts of palm oil milling process and an additional expert from the academic background. The multi-criteria of each sustainability impacts (technical, economic, environmental, and social) are assessed for the weights of the occurrence, severity, and detection of the FMEA. The result of the study suggested that the degree of failure severity for social impact is considered as the highest priority for palm oil mills. This paper provides insights for management to improve organizations’ sustainability performance at the operational level by considering sustainability impact in analyzing failure mode and effect of equipment.
Classroom research on Mandarin Foreign Language Learning Via Smartphone Applications
Authors: Chua Nurul Ain , Tajuddin Azza Jauhar Binti Ahmad , Soon Goh Ying , Rashid Roswati Abd. , Zakaria Rosdi , Zaid Che Mohd , Ahmad Mazlina
Published: June 2020

Mandarin is the most sought-after language due to its rapid economic development. Simultaneously, Mandarin is also becoming arguably the most difficult language in the world especially for those who are not used to the tonal language. Today, the speedy development of the internet and advanced technology has transformed Mandarin educators to accommodate innovation in pedagogy occasioned by the worldwide demand for the acquisition of Mandarin as a foreign language by non-native speakers. Thus, this action research is to investigate to what extent smartphone applications, the latest mobile technology could impact teacher’s pedagogical practice and students’ oral performances. One class of Mandarin non-native learners participated in the study. The triangulation method was used in collecting data. The data from students’ diaries, teacher’s self-reflective journals, focus group interviews and oral assessment were analysed through content and thematic analysis to gauge the impact of the technology integration. The results revealed that, over a four-week intervention period, the students viewed their Mandarin pronunciation and confidence level of oral had improved. But they contradicted the result of oral assessment. In short, Mobile-Assisted Language Learning is a potential approach to address the difficulty of Mandarin. However, to make it a success, the existence factors which facilitated and hindered students’ performance during the technology integration instruction were the most crucial.
Contextualising Maqāṣid al-Sharī’ah and STEM (Science, Technology, Engineering, and Mathematics) education in the era of the Industrial Revolution 4.0
Authors: Ahmad Abdul Sham bin , Rahim Baidruel Hairiel Abd , Chik Wan Yusof Wan , Mohmmad Mohd Hagia Sofia , Diah Nurazzura Mohammad , Karim Abdul Halim Abdul
Published: June 2020

The Maqāṣid al-Sharī’ah is one of the disciplines that has been given a unique space in various fields of study nowadays. Though a plethora of studies touched on Maqāṣid al-Sharī’ah, it rarely linked to the area of STEM education. This phenomenon is crucial in ensuring that the education world is in the mould of the Maqāṣid al-Sharī’ah while at the same time realising the pure will of the Islamic Legal System. STEM Education in the image of the perfect Maqāṣid al-Sharī’ah is believed to be able to shape and produce good people in the future, especially in driving a very challenging industrial revolution. Through a qualitative approach using document analysis, this study attempts to draw out the basics of education by the Maqāṣid al-Sharī’ah that can form the perfect and proper thinking. Subsequently, the investigation continued by discussing the elements of the Maqāṣid al-Sharī’ah identified in these fundamentals. The paper revealed that four main components identified in this issue, namely, the belief in good faith, noble morals, Sharī’ah-based thinking, and professionalising the world. All of these elements acquired by humans through the process of education. The implication is that the study found that placing the STEM education world in the purview of the Maqāṣid al-Sharī’ah should be an influential agenda of national education to drive and meet the challenges of industrial revolution 4.0. Therefore, this effort should be the attention of the national education policymakers who must involve scholars in the field.
Emerging Truths in Mandarin Mobile-Assisted Language Learning
Authors: Chua Nurul Ain , Tajuddin Azza Jauhar Binti Ahmad , Soon Goh Ying , Shen Dyg Min , Zakaria Rosdi , Almanar Muhammad Abduh , Fatmariana Sri
Published: June 2020

Mobile devices and technology integration in teaching and learning are becoming common tools in education. However, not all technology-enhanced instruction is structured in the same manner. At the same time, mobile learning is a comparatively new occurrence and the theoretical fundamental is presently under development. Thus, this paper presents a comprehensive pedagogical view among the current Mandarin mobile learning practice to the existing MALL framework and principles. The researcher cum instructor conducted an individual Mandarin mobile instruction via smartphone applications. The results from the implementation were qualitatively studied and analysed to evaluate as to what extent the Mandarin practice has kept up with the existing MALL pedagogical framework and principles. The emerging truths found in the results that might be impactful for Mandarin mobile learning were pedagogical skill, situation task content, continuous reflection, readiness, and native speaker.
Preserving the Nation’s Legacy Through Emerging Technology
Authors: Lah Hazlina Awang , Ghani Rosmah Abd , Mahmood Anis Salwani , Rahman Mohd Nazri Abdul , Sulaiman Ismail , Omar Azman , Mustafa Wan Azani
Published: June 2020

The proverb is the legacy of the Malay people with special privileges in a speech that must be introduced to every generation so that this proverb will not be forgotten and never consumed by the ages. The role of the proverb in speech and writing is seen to less widely used in today’s younger generation. In the school curriculum, the language taught in the syllabus. However, conventional teaching and learning techniques cause students to become bored and less attentive when teaching. A new approach has been developed to enhance students’ interest in language learning. Ceritera Peribahasa Maya is a series of 3D digital proverbs storybook developed through the technology of the century. Ceritera Peribahasa Maya is a digital language learning approach that includes e-learning, teaching aids, learning and facilitating strategies and assessment tools. It applies Augmented Reality (AR) technology, QR Code, Google Cloud, and Gamification applications. Usability Testing of Virtual Speech measured in terms of user satisfaction. A mean of 4.87 for user satisfaction shows that Ceritera Peribahasa Maya is a great way to teach and learn digitally. This language innovation is a new turning point for teachers and students to realize the Malaysian Education Development Plan (PPPM 2013-2015) that emphasizes the aspect of ICT in learning. These applications are in line with modernity while preserving the integrity of the nation’s heritage.
Research trends in ICT and education: A systematic review of continuous professional development courses for online educators
Authors: Ibrahim Ruslina , Norman Helmi , Nordin Norazah , Mazin Khairol Azwar
Published: June 2020

The role of Information Communication Technologies (ICTs) and online courses in Continuous Professional Development (CPD) for educators have remain debatable. A limited number of studies have systematically been reviewed on the growing influence of ICTs and continuous professional development courses for online educators. This paper aims to extract the value and appropriateness of the trends concerning the focus, types, and context of CPD, the goals and tools of research, and the types of data collected. To map the popular trends, methods, and ICT tools used in CPD online courses as a research methodology, researchers performed a systematic literature review of studies written in English and published between January 2015 and January 2019. Inclusion and exclusion principles were employed to identify studies of any ICTs based in CPD design that examine the concept of online professional development courses through the point of view of the design used and to review the impact that ICTs have had on numerous aspects of teaching and learning for educators. Researchers screened and retrieved all possible titles and abstracts and potentially relevant studies to established whether the study met the inclusion criteria. The results of the review revealed that ICTs have certain influences on online CPD for educators and that this influence applies to educators.
Student Self-Recording Videos for TVET Competency in MOOCs
Authors: Mazin Khairol Azwar , Norman Helmi , Nordin Norazah , Ibrahim Ruslina
Published: June 2020

Student-based competency assessment in written or practical form is important to confirm that a student has demonstrated the mastery of practical knowledge and skills as well as the basic knowledge required to perform tasks in accordance with certain standards in Technical and Vocational Education Training (TVET). The instructors involved in the Education and training process carry out assessments to determine the effectiveness of the training and new skills they have learned. Assessment is done in written and practical form and is aimed to assess student knowledge based on cognitive domain, student skills based on the psychomotor domain and student attitudes based on the affective domain. In TVET, instructors face difficulties in assessing student competencies due to time, workshop facilities and human resource factors. The competencies of students are usually assessed by the instructor in students’ workspaces either in the workshop or workspaces during industrial training. Previous studies have indicated that self-recording can be used an assessment approach. Thus, in this study, we investigate the use of self-recorded videos in assessing TVET student competencies. In the assessment self-recorded video is performed by the student by recording the work process from beginning to end and is shared on the MOOC. Self-recorded videos not only show practical work conducted by students but also demonstrates aspects of cleanliness, safety and good values while working. In addition, videos uploaded on MOOCs can be accessed via instructors as well as other users. Via public sharing of student’s work, the instructor can assess and certify that a student is competent while other students can collaborate among themselves and learn the steps that have been taken and new techniques that can be tried.
The Effectiveness of Mobile Application in Learning Malay Foreign Language
Authors: Sung Cho Min , Ahmad Mazlina , Mansor Noor Rohana , Rashid Roswati Abdul , Abdullah Nurul Ain Chua
Published: June 2020

The use of new technologies has impacted effectiveness in learning which contributes to the smoothness of language performance. The language implication involves all subjects, including Malay foreign language. For instance, the use of mobile learning has been shown a considerable and dynamic potential in learning Malay foreign language. Mobile application usage enables a variety of teaching innovations that assist educators and students in pursuing knowledge and language skills. Thus, this concept paper aimed to identify the Learning Theory which related to mobile application. Apart from that, it is also to explore the importance and effectiveness of mobile application usage in Malay foreign language instruction. The literature review is based on publications from 2015 to the present. It is hoped this study can be used to benefit the foreign students while integrating the mobile application in their learning, and to improve the language performance in line with current developments.
A Frontal Plane Waist Motion With A Limit HipOffset Y Length Using Inverse Kinematics In NAO Humanoid Robot To Align The Center of Mass (COM) And Robot’s Foot
Authors: Muhammad Razmi R. , Nur Azliza A. , Nik Nur Zuliyana R. M.
Published: June 2020

All articles The design of humanoid robot walking motion is achievable only through the use of robot kinematics. In this paper, we study the problem of waist motion (HipOffsetY) in frontal plane for NAO humanoid robot as a starter to make the robot walk. The inverse kinematics allow NAO humanoid robot to record the robot configuration ways to go from the three-dimensional space of the robot to the joint space. The inverse kinematics defined the relation between points in the three-dimensional space (position and orientation) and joint values in the joint space of the robot’s kinematics chain. The simulation using Robotic Simulator Simulation V-REP (Virtual Experimentation Platform) by Coppelia Robotics. Inverse Kinematics can provide the mechanism to transform such a trajectory into another trajectory in the joint space of the robot. The inverse kinematics is demonstrated in waist motion to the left and right at 0.05m
An Optimal Penalty Constant For Discrete Optimal Control Regulator Problems
Authors: Apanapudor J. S. , Aderibigbe F. M. , Okwonu F. Z.
Published: June 2020

Indiscriminate and imprecise use of penalty constants can lead to substantial computational problems and consequently erroneous conclusions and deductions. This paper view this, with utmost seriousness and thus establish an optimal penalty constant φ that optimizes the minimization of the cost functional

〈

z
,

H
˜

z

〉

while solving discrete optimal control problems using extended conjugate gradient method (ECGM). I employed some measures that examine optimal control of dynamic processes that can be described by Differential Algebraic Equations (DAEs) that entails integer restriction on some or all of the control functions. I established the construction of an optimal penalty constant which can be employed in the extended conjugate gradient method algorithm for discrete optimal control regulator problems. Comparative results emanating from the use of different penalty constants/algorithms on some problems are given. The obtained numerical results reveal that the proposed optimal penalty constant expression is efficient.
Modified Sine Cosine Algorithm for Identification of Liquid Slosh based on Continuous-time Hammerstein Model
Authors: Jui Julakha Jahan , Suid Mohd Helmi , Ghazali Mohd Riduwan , Ahmad Mohd Ashraf , Tumari Mohd Zaidi Mohd
Published: June 2020

This paper presents the identification of liquid slosh plant using the Hammerstein model based on modified Sine Cosine Algorithm (mSCA). A remote car that carries a container of liquid is considered as a liquid slosh experimental rig. In contrast to other research works, this paper considers a piece-wise affine function in a nonlinear function of the Hammerstein model, which is more generalized function. Moreover, a continuous-time transfer function is utilized in the Hammerstein model, which is more suitable to represent a real system. The mSCA method is used to tune both coefficients in the nonlinear function and the transfer function of the Hammerstein model such that the error between the identified output and the real experimental output is minimized. The effectiveness of the proposed framework is assessed in terms of the convergence curve response, output response, and the stability of the identified model through the pole-zero map. The results show that the mSCA based method is able to produce a Hammerstein model that yields identified output response closes to the real experimental slosh output with 82.12 % improvement of sum of quadratic error.
Morphology, Mechanical and Neutron attenuating properties of carbon black filled EPDM / HDPE composites
Authors: Abdulrahman Sajith Thottathil , Ahmad Zakiah , Thomas Sabu , Rahman Azerai Ali
Published: June 2020

Flexible polymer composites have been the focus of demanding interest in classical studies of neutron radiation shielding applications. The influence of varied loading of carbon black on the morphology, mechanical and neutron shielding properties of Ethylene Diene Monomer Rubber/High-Density Polyethylene (100/30) blends are observed through this experimental work. EPDM and HDPE were blended in a Brabender type internal mixer and other functional additives were dispersed using two roll mill and later cured using a compression molding, on determining the cure time on rubber rheometer. The carbon black addition enhanced HDPE dispersion in the EPDM matrix, as evidenced through morphological and mechanical analysis. The improvement in the tensile parameters indicates the reinforcing efficiency of the carbon black in EPDM/HDPE blends. Lower tear resistance suggests a weak interface within the EPDM / HDPE blend at low black carbon concentration. Carbon black filled EPDM/HDPE composites displayed a total neutron macroscopic cross-section of 0.28 cm−1 for 2 MeV energy neutrons.
Application of shape memory alloys (SMA) as a retrofit and strengthening component on reinforced concrete columns: Review Paper
Authors: Zulkifli S N I , Mohd Hisbany M H , Ismail R , Zakwan F A A , Hazrina A , Ismail Badrul N. , Rashid R S M
Published: June 2020

Concrete structure deterioration and design deficiencies are stated as serious problems that frequently occur in the construction industry. It may lead to the loss of strength, stiffness, durability, and ductility of the existing structure. Therefore, an immediate structural strengthening must be highly considered to improve and repair the structure performance due to which the structure may fail to serve its purpose. The aim of this paper is to provide review of the structure strengthening methods for reinforced concrete columns proposed by researchers in the past two decades. However, the scope of this review paper is limited only to reinforced concrete columns retrofit by using the material of shape memory alloy (SMA). At the end of this paper, a suitable SMA form will be proposed for the future direction of research into this strengthening method.
Performance Analysis of IoT Protocol Stack over Dense and Sparse Mote Network Using COOJA Simulator
Authors: Zenalabdin Hussam Shamseldin , Buhari Abudhahir , Nyamasvisva Tadiwa Elisha
Published: June 2020

Internet of Things (IoT) interrelates computing devices, and digital devices with animals or people and they have ability to transfer amounts of data over a network needless of any human to computer interaction. IoT is composed of sensor nodes or motes, servers, and the internet allowing these devices to collect and exchange information. Lossy networks, stressed out connections and high power consumption are the major concerns in IoT. Protocols are used for messages management and among computing nodes and they act as controls for telecommunication medium using radio frequencies. This paper, evaluates the IoT protocols’ stack over on dense network and sparse network topology which include application layer’s protocols such as, MQTT, CoAP and transport layer protocols’ UDP and TCP. Analysis is done on transport layer through RPL protocol and on physical layer using Z1 motes and Sky motes. We utilize Cooja simulator and Contiki operating system for simulations. The performance metrics for the evaluation of protocol stack are power intake, radio responsibility cycle, and average inter-packet arrival time.
A Review of Graph Theoretic and Weightage Techniques in File Carving
Authors: Sari Sari Ali , Mohamad Kamaruddin Malik
Published: June 2020

Digital Forensics is a platform that helps in assisting investigation carried out in computer crimes through the recovery of material that is found in digital devices. Material is recovered through a method known as file carving that helps to recover data from storage media. Moreover, it also retrieves the extract hidden, overwritten or deleted files. File carving enables the file recovery without knowledge about contextual information such as file system metadata. Due to recent expansion in the research of information technology, file carving has become an essential technique for general data recovery and digital forensics investigations. Therefore, considering the important role played by file carving the present study conducted a survey of the previous literature to find out various data carving techniques. Results, from the previous literature helped to provide several algorithms for image construction which are based on graph theoretic techniques. Furthermore, the present study classifies the file carving techniques for JPEG file into two categories namely basic carving technique and advanced carving technique. The paper concludes by providing limitations in the present study which could be helpful for future investigations associated with the fragmentation problem of data files.
Changes in structure of PA6 during electron irradiation
Authors: Sagdoldina Zh.B. , Rakhadilov B.K. , Akatan K. , Kabdrakhmanova S.K. , Kurbanbekov Sh.R.
Published: June 2020

The impact of electron irradiation on the structure of the PA6 polymer is researched in this article. The electron beam irradiation of samples from PA6 was carried out on an industrial pulse accelerator ILU-10 under different modes. Beam energy and radiation dose varied. The structural changes of PA6 were studied by scanning electron microscopy, X-ray phase analysis, IR Fourier spectroscopy, and the thermal characteristics of the polymer were studied by differential scanning calorimetry. It was revealed that after electron beam treatment, the melting temperature of the PA6 polymer decreases from 214 °C to 217 °C. It was found that electron beam treatment leads to a change in the surface morphology, that is, the surface becomes rough, the depth of the roughness and the structure of spherulites increase.
Improving the Gain Performance of Air Substrate Patch Antenna Array Using the Effect of Conductive Material Thickness Study for 5G Applications
Authors: Mohammed A. SB , Kamal S. , Bin Ain M F. , Najmi F. , Ahmad Z A. , Zahar Z. , Hussin R. , Zubir I A. , Ab Rahman MF.
Published: June 2020

Over the decade, extensive applications of portable electronic devices have progressed enormously. This has ultimately influenced the shortage of bandwidth supply. Therefore, in satisfying the demands of consumers, low-cost antennas are required to be designed specifically for the fifth-generation frequency spectrum (5G) devices. The main goal of this paper is to report a high gain enhancement in a low profile and economical antenna operated effectively using air substrate in 5G devices. This paper discusses the study effects of thickness on the substrate and conductive material, also the novel design of a cost-effective, air-substrate based microstrip antenna with enhanced gain at 28 GHz resonance for the 5G mobile phone application. In the proposed design, a 2×2 array configuration of radiating elements was designed to occupy a 35.7×31.5×0.5 mm3 volume. Copper (Cu) material was used in the fabrication of the antenna prototype. The proposed antenna was evaluated and compared to the simulation results to demonstrate the design’s reliability. The proposed system provided a peak gain and performance efficiency of 15.6 dB and 86.9.4%, respectively, when operated at 28 GHz resonance.
Left-handed Circular-Shaped Compact Metamaterial for X- and Ku-Band applications
Authors: Ramachandran Tayaallen , Iqbal Faruque Mohammad Rashed , Islam Mohammad Tariqul
Published: June 2020

The purpose of this paper is to propose a new circular-shaped metamaterial (CM) design for X- and Ku-band applications. The discovery of exotic characteristics in metamaterial encourages to carry out this research study. The proposed design is numerically simulated by utilising Computer Simulation Technology (CST) software. The CM structure consists of few circular rings that designed on 8 × 8 mm2 and 1.6 mm thick of FR-4 dielectric substrate material. The Finite Integration Technique (FIT) used to perform the simulation in CST. Frequency range of 4 to 18 GHz is adopted and the CM design manifest resonance frequencies at 8.19 GHz, 11.32 GHz (X-band) and 16.39 GHz (Ku-band). These resonance frequencies possess an acceptable magnitude values for instance, -30.70 dB, -22.59 dB, and -20.13 dB respectively. In additional, the proposed CM design exhibits left-handed characteristic at both resonance frequencies. Therefore, CM with unique behaviour can be applied for many current application fields such as satellite communication, wireless computer networks, weather monitoring, and etc.
Tracking System using RFID for Hiking Activity with IoT Technology
Authors: Masohor S M A S , Bakar M Z H A , Yamin W S A W , Wahab Mohd Helmy Abd , Ahmad Muhammad Shukri , Ma’Radzi Ahmad Alabqari , Ibrahim Tg Nadzlin Tg. , Choon Chew Chang
Published: June 2020

Hiking is popular in Malaysia because of the geographical factors that have a lots of mountains. Since this is an extreme activity, it gives a lot of risk for the hikers. There were 134 incidents in the mountains reported during 1996 until 2014 where 52 cases are about missing people. When encounter with missing people cases, it is difficult to pinpoint the last location of victim. Therefore, this project aimed to help the rescuer by providing them information of the victim’s last location by creating a tracking system using RFID in order to store data on each checkpoint along the hiking trails in memory card. This system also equipped with wifi which allowed the system send notification using Telegram Apps. The rescuers can extract the data from the memory card from each checkpoint to trace the last location of the victim before reported missing. By having this information, the rescuers will save a lot of time because they can estimate from which area they should start the search and rescue operation.
Removal of methylene blue from aqueous solution using sodium bis (2-ethylhexyl) sulfosuccinate-hexanol reverse micellar system
Authors: Rafiq Rehan , Moniruzzaman Muhammad , Borhan Azry
Published: June 2020

Textile manufacturing is one of the core industries which discharges a heavy load of chemicals during the dying process. As a result, the release of large contents of dyes through aqueous effluents leads to both environmental and economic concerns. The present study investigates the removal of a model cationic dye, i.e., methylene blue using a reverse micelles system of 1-hexanol as an organic solvent and sodium bis(2-ethylhexyl)sulfosuccinate (AOT) as an anionic surfactant. The influence of different parameters including surfactant concentration, reaction time and dye concentration on extraction performance, was studied. Extraction efficiency was increased with increasing time and surfactant concentration, while it was decreased with the increase in dye concentration. For this system, the optimum extraction condition correspond to surfactant concentration around 0.05M, equilibrium time 20min and dye concentration around 500 ppm, resulting in extraction efficiencies around 99%. The microdomains of water within the reverse micelle system are the driving force for the clarification of methylene blue dye from aqueous solution.
Small-Signal Stability Analysis of The Hydrokinetic Energy Harnessing connected to The Grid
Authors: Ibrahim W I , Mohamed M R , Ismail R M T R
Published: June 2020

This paper presents the modelling of the hydrokinetic system for the small-signal stability analysis under the small disturbances due to variation and fluctuation of water velocity in the river or marine. The complete modelling of the hydrokinetic system consists of vertical axis H-Darrieus turbine, direct-drive permanent magnet synchronous generator (PMSG), back-to-back converter and the grid network. By linearising all the equation around the steady-state value, the dynamic equation of the hydrokinetic system is derived. The stability of the system is tested with and without the PI controller. The eigenvalues analysis-based approaches have been used to investigate the stability of the system under the small disturbances. The findings show, the stability of the hydrokinetic system with PI controller is improved up to 57.82% by reducing the oscillation frequency at the Rotor Side Converter (RSC).
A Design Theory for Student Self-service University Management System
Authors: Ong Muhamad Idaham Umar , Ameedeen Mohamed Ariff
Published: June 2020

The role of Information System Design Theory in software development is enormous. With the help of design theory, developers could estimate what the system will be and what the system will do. The focus of the article is to establish the design theory of a self-service university management system. The objectives of this publication are to identify the most relevant publication that will act as a guideline to generate the design theory artefacts and to establish the artefacts which will consists of three components named kernel theories, meta-requirements and meta-design for the stated system. The system scope will be focused on enabling self-service functions. Validation will be done through a traceability matrix between the meta-requirement and meta-design against the real-world user requirement. The significant of this article is to provide an initial set of design theory artefacts to be utilization software developer in development or evaluation of a University Management System.
Analysis Potential Benefit of Energy Cost the Chiller Plant Operation Engaging with Tariff Scheme
Authors: Shaari SR , Othman M.L. , Hizam H. , Dahlan NY , Chik Mohd Hanafiah , Yahaya Mohamad Suhaimi , Bakar Hamzah Abu , Anuar Suhafizudin Zainal , Amir Zulhelmi
Published: June 2020

Engagement with new tariff scheme, Enhanced Time of Use (EToU) after switching from old tariff scheme, Time of Use (ToU) for chiller plant operation may be not promising a significant benefit for consumer in term of techno-economic value or even getting worse. This uncertainty condition make consumers doubt to switch onto latter. Therefore this study is focusing to analyze and looking potential benefit of energy cost the chiller’s plant operation when engaging with the new tariff scheme EToU rather than ToU. Consumer’s potential benefit appear for this study when switching from ToU to EToU tariff scheme for chiller plant operation through shifting the chiller’s plant operation from peak to mid-peak hour while maintaining discharging operation of thermal energy storage (TES). This could benefit both consumer’s on demand and utility on supply side respectively. Consumer may experience lower energy cost charged by utility. While utility could minimize the investment cost to install and maintain power system infrastructure in order to meet energy demand as well. However, further comprehensive study on this paper is also discussed for looking the more significant benefit to reduce energy cost of chiller’s operation when engaging with EToU tariff scheme.
Modelling of HVDC Link for Power Quality Assessment
Authors: Yusof S H N , Jumaat S A , Kok B C
Published: June 2020

Conversion technique of HVDC has become a dominant technology for long distance bulk power transmission. The AC and DC system are interconnected by HVDC converter thus, it becomes the medium of the harmonic transfer. The presence of harmonic not only increases the losses, but it can also lead the system to collapse. In this study, the passive filter is used to mitigate the harmonics in both the AC and DC sides of the HVDC network by tuning it until satisfied with the harmonic standard. The test system of TNB-EGAT HVDC link is modelled using PSCAD software with AC voltage rating of 275 kV and 230 kV for rectifier and inverter side, respectively. The system is controlled by the control system that has been modelled according to CIGRE Benchmark. Comparison of the simulation results between before and after the implementation of passive filters in the system reveals that the harmonics have been mitigated effectively. The results show that the level of THD current at the AC side reduced to 0.2336% and 0.0154% at rectifier and inverter side, respectively.
Study of soil structure interaction on basement wall with variants in distance and depth of the basement on soil class SE
Authors: Saragi Yetty , Irsyam Masyhur , Roesyanto  , Hendriyawan
Published: June 2020

The function of the basement is to carry the weight of the upper structure into the soil and to resist lateral loads around the basement wall. One aspect of geotechnical engineering that often a problem in basement wall planning is the determination of lateral ground pressure in the basement wall due to earthquake which must be held by the basement wall. In this study, an analysis of the effects of local soil conditions due to dynamic loads is done through analysis of soil-structure interaction. The analysis is done by modeling the local soil with variations in basement depth and the adjacent basement distance to get the lateral pressure distribution due to dynamic load. The analyzed soil conditions are considered homogeneous at land sites SE (soft soil) with the dynamic load input from earthquake loads uses a 10% probability of exceedance in 50 years (500 years). The most influential parameter for soil displacement is the distance of the basement and then the depth of the basement. The most influential parameter on lateral forces is the depth of the basement followed by the distance of the basement.
Traffic Management System in Abuja City Center, using Geographic Information Systems (GIS) and Global Positioning System (GPS). A case study of FCT, Nigeria
Authors: Ashara A H , Saleh S , Hassan U , Kaura M J
Published: June 2020

In any city in the world, moving from one point to another is an endurance task. Regardless of the social status of the traveller, the situations under which persons travel are becoming challenging gradually. The condition of Abuja traffic is no diverse. Efforts were made in this study, to map traffic conditions along selected corridors of Federal Capital Territory (FCT) Abuja using Geographical Information System (GIS) and Global Positioning System (GPS) Techniques. The primary data used includes the geographical coordinates of the chosen traffic corridors using GPS, the extent of vehicle traffic congestion and traffic counts along the corridors. Whereas the secondary data used are Abuja FCT’s topographical and road map from the Abuja Geographical Information System (AGIS). The data obtained were entered and used to develop an information system for traffic conditions (TCIS). Data recovered and attribute spatial analysis were displayed using ArcGIS 10. The results were presented in a map format, making it easy to interpret and quick to make decisions. The results display different levels of congestion and vehicular volume along digital traffic corridors. The results will be beneficial for agencies in charge of traffic conditions planning and management in Abuja FCT. GIS-GPS are powerful tools for both spatial and non-spatial data analyses. From the analysis, it can provide traffic data (Speed, Level of Service, Traffic and Delay Time) to transport planners in road controlling authorities in order to understand congestion better, determine its causes and prioritise investment where it is most needed.