Impact of skill mismatch on employee job satisfaction. A study on HRM downstream corporate office Petronas / Nur Sabrina Suhaimi

The purpose of this study is to identify to what extend the type of skill mismatch impact on employee job satisfaction. The dependent variable is Job Satisfaction and independent variable are Over Skilled and Under Skilled which is among the type of skill mismatch. This research is being conducted in HRM Downstream Corporate Office, PETRONAS. In completing this research, about 48 questionnaires have been distributed to the respondents. The respondents is pick randomly among the staff in HRM Downstream Corporate Office, PETRONAS. In order to get the result, the researcher has used SPSS program to analyze data from the information gathered. From the findings, the researcher indicates that there is a relationship between the type of skill mismatch and employee job satisfaction

Estimation of satellite link’s fade margin using non-meteorological technique and worst month analysis

Satellite technology is shifting to higher frequencies such as Q or V-band to cater to greater bandwidth and higher data rates applications such as videoconferencing, internet of things (IoT) and telemedicine. The main challenge in deploying high-frequency bands in heavy precipitation areas is severe rain attenuation. In this paper, a frequency scaling technique was developed to estimate the fade margin at a higher frequency. The worst month analysis was also conducted since the analysis is also important in determining dependable fade margin. The result was evaluated and analyzed using root mean square error (RMSE) and percentage error. The proposed model offers the smallest RMSE and lowest percentage error when compared to all existing prediction models. A dependable fade margin acquired from high-accuracy rain attenuation estimation is very important. This is to apply the best mitigation technique in overcoming rain attenuation in the satellite-Earth link so that, the best system performance can be delivered

Assessment of monthly rain fade in the equatorial region at C & KU-band using measat-3 satellite links

C & Ku-band satellite communication links are the most commonly used for equatorial satellite communication links. Severe rainfall rate in equatorial regions can cause a large rain attenuation in real compared to the prediction. ITU-R P. 618 standards are commonly used to predict satellite rain fade in designing satellite communication network. However, the prediction of ITU-R is still found to be inaccurate hence hinder a reliable operational satellite communication link in equatorial region. This paper aims to provide an accurate insight by assessment of the monthly C & Ku-band rain fade performance by collecting data from commercial earth stations using C band and Ku-band antenna with 11 m and 13 m diameter respectively. The antennas measure the C & Ku-band beacon signal from MEASAT-3 under equatorial rain conditions. The data is collected for one year in 2015. The monthly cumulative distribution function is developed based on the 1-year data. RMSE analysis is made by comparing the monthly measured data of C-band and Ku-band to the ITU-R predictions developed based on ITU-R’s P.618, P.837, P.838 and P.839 standards. The findings show that Ku-band produces an average of 25 RMSE value while the C-band rain attenuation produces an average of 2 RMSE value. Therefore, the ITU-R model still under predicts the rain attenuation in the equatorial region and this call for revisit of the fundamental quantity in determining the rain fade for rain attenuation to be re-evaluated

Development of portable charger for mobile phone using arduino microcontroller during disaster recovery

In the recent years, hundreds to thousands of people have been killed in many disasters across Asian region, such as tsunami, floods, earthquakes and so on. During disaster, most of the electricity supply will be disrupted, then the telecommunication networks will fail. During emergency response, the necessity to have portable charger for mobile phone arises as the victim could communicate with the relevant authorities or volunteers. The objective of this research is to design and develop portable charger for mobile phone using Arduino microcontroller, which can be used effectively during disaster event. Three main circuits have been implemented, including energy harvesting and DC/DC boost converter, intermediate battery charging, and Li-Ion charging. The energy harvester circuit will be the combination of mechanical and solar panel. Performance evaluation have been conducted to evaluate the best DC motor and solar panel, as well as the final charging time for Li-Ion battery

Estimating losses at 40-GHz downlink using non-meteorological techniques in heavy rain areas

The advancement of satellite communication has arisen tremendously where higher capacity communications systems are needed. Most satellite engineers are shifting to Ka, Q, and V-band upcoming since the low frequencies such as below 10 GHz are already congested. Actual measurement data at millimetre-wave frequencies in tropical regions are minimal. The prediction of rain attenuation at frequencies above 10 GHz is required to determine a reliable fade margin. In this paper, a statistical frequency scaling technique has been developed as an alternative way of estimating rain attenuation. The technique was derived based on the correlation between the attenuation ratio of a higher and lower frequency against the attenuation at a lower frequency. The attenuations from the proposed model were compared to the proposed frequency scaling by International Telecommunication Union-R (ITU-R) as well as the conventional ITU-R rain prediction model. To deliver a reliable model, validation methods have been done using a set of data with different years and locations in tropical regions. A dependent prediction technique with the lowest root mean square error (RMSE) value and error was produced. This technique is beneficial in applying suitable mitigation techniques to moderate rain fade in tropical regions

Performance and limitation of mineral oil-based carbon nanotubes nanofluid in transformer application

Transformer oil-based carbon nanotube (CNT) nanofluids which have unique dielectric behaviour, is effective as the posterity insulation fluids that can boost the performance of the transformer as they proposed inspiring, distinctive behaviour compared to existing transformer oil which is widely used in practice namely mineral oils. With this motivation, the effect of AC breakdown voltages for two sonication duration (30 min and 120 min) techniques were applied in producing nanofluids, two different diameter sizes of CNTs (20 nm) and five different weight concentrations (0.01 g/L to 0.2 g/L) are investigated. The results indicate CNT with a longer sonication process, a smaller diameter and low concentrations of CNT provides the highest breakdown values that gave a huge potential impact on the conventional transformer oil. The Weibull and Normal distributions functions are used in this paper to obtain a successful forecast of the lowest, average, and highest possibility of breakdown rates (1%, 50% and 90%). It figures out that, CNT nanofluid can reach the greatest breakdown efficiency as good insulating oil at 0.01 g/L concentration. To understand the characterization of CNT nanofluids samples in detail, Raman spectroscopy analysis, storage modulus, viscosity and heat flow of mineral oil have been evaluated accordingly as a function of increasing temperatur

Thermal Aging Effects on the Electrical Breakdown Voltage of TiO2 and MWCNT Nanofluids Based on POME

In this work, the aging behavior of liquid insulation in transformers using chemically modified refined, bleached, and deodorized palm oil (RBDPO) olein is investigated. The transesterification process is used to modify RBDPO olein to produce palm oil methyl ester (POME), which is used as a base fluid for nanofluid (NF) preparation. The performance of POME with the dispersion of semiconducting titanium oxide (TiO2) and conducting multi-walled carbon nanotube (MWCNT) nanoparticles (NPs) at different concentrations on the AC breakdown voltage (AC BDV) as insulation in transformers is evaluated for their aging behavior. The accelerated aging was conducted under sealed conditions at a temperature of 130°C for 1000 hours. The results show that incorporating TiO 2 and MWCNT NPs into POME did not have an adverse effect on the BDV, regardless of the doping concentrations. Notably, POME-based TiO2 NFs exhibited the highest AC BDV after thermal aging, specifically at a concentration of 0.05 g/L. Anderson-Darling goodness-of-fit statistics were performed on the experimental data to verify their agreement with the Normal and Weibull distributions

Magnetism And Thermomechanical Properties In Si Substituted MnCoGe Compounds

MnCoGe-based compounds have been increasingly studied due to their possible large magnetocaloric effect correlated to the magnetostructural coupling. In this research, a comprehensive study of structure, magnetic phase transition, magnetocaloric effect and thermomechanical properties for MnCoGe1−xSix is reported. Room temperature X-ray diffraction indicates that the MnCoGe1−xSix (x = 0, 0.05, 0.1, 0.15 and 0.2) alloys have a major phase consisting of an orthorhombic TiNiSi-type structure with increasing lattice parameter b and decreasing others (a and c) with increasing Si concentration. Along with M-T and DSC measurements, it is indicated that the Tc value increased with higher Si concentration and decreased for structural transition temperature Tstr. The temperature dependence of the magnetization curves overlaps completely, indicating that there is no thermal hysteresis, and it is shown that the transition is the second-order type. It is also shown that the decreased magnetization on the replacement of Si for Ge decreases the value of −ΔSM from −ΔSM~8.36 J kg−1 K−1 at x = 0 to −ΔSM~5.49 J kg−1 K−1 at x = 0.2 with 5 T applied field. The performed Landau theory has confirmed the second-order transition in this study, which is consistent with the Banerjee criterion. The magnetic measurement and thermomechanical properties revealed the structural transition that takes place with Si substitution of G

Tahap kefahaman makna simbolik permainan Kercang dalam kalangan remaja Orang Asli suku kaum Jakun

Arus pemodenan telah memberi kesan yang mendalam terhadap permainan tradisional sesebuah masyarakat sama ada Melayu, Cina, India sertamasyarakat Orang Asli. Oleh yang demikian, pengkaji melakukan sebuah kajian yang bertujuan untuk mengenal pasti makna simbolik permainan kercang masyarakat Orang Asli suku kaum Jakun dan menganalisis tahap kefahaman para remaja mereka terhadap makna simbolik permainan tersebut. Kajian ini dilakukan di Kampung Sentosa, Lenga dan pengkaji membataskan responden kepada sepuluh orang sahaja. Kajian ini menggunakan pendekatankualitatif untuk menjalankan kajian ini dan kaedah temu bual, kaedah pemerhatian dan kaedah kepustakaan telah digunakan untuk mendapatkan data berkaitan objektif. Berdasarkan pengaplikasian kaedah-kaedah tersebut, dapatan kajian telah menunjukkan bahawa kercang mempunyai enam jenis iaitu Kercang Pasung, Kercang Kahwin, Kercang Tipah Tertipu, Kercang Wau, Kercang Gunting dan Kercang Dua Lubang. Hasil dapatan juga mendapati bahawa seramai tujuh orang remaja tidak memahami makna simbolik bagi kercang pasung dan empat orang remaja tidak mempunyai kefahaman tentang makna simbolik kercang kahwin. Oleh itu, hasil akhir kajian ini merumuskan bahawa para remaja suku kaum Jakun tidak mempunyai kefahaman yang baik tentang makna simbolik permainan tradisional mereka

Mechanical powered portable charger for disaster recovery: design and implementation using hand cranking DC motor and arduino microcontroller

This book presents the development of mechanical powered portable charger to charge mobile phone during disaster recovery. It emphasizes on efficient mechanical energy harvesting circuit for charging mobile phone battery with the utilization of intermediate battery. In this book, Sealed Lead-Acid (SLA) or dry battery was selected as an intermediate battery to protect the Lithium Ion battery which is very sensitive to overcharging and discharging. Three modules are employed in this book, including a DC/DC boost converter circuit, SLA charging circuit and mobile phone charging circuit utilizing Arduino microcontroller. During disaster, main power supply will be interrupted. If only the victims can communicate through their mobile phone, there will be high chance that they can be rescued by the rescue team. Note that, the portable cell tower can be set up by the relevant authorities during disaster. This book can benefit government, NGO, or volunteers during disaster, as well as many people in disaster prone area