151 results on '"Herman, Sukreen Hana"'
Search Results
2. Fabrication of integrated all-solid titanium dioxide and silver/silver chloride electrodes for facile pH electrochemical detection via extended-gate field effect transistor transducing method
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Hashim, Shaiful Bakhtiar, Kamarozaman, Nur Syahirah, Mahzan, Norhidayatul Hikmee, Zainal, Nurbaya, Rosli, Aimi Bazilah, Herman, Sukreen Hana, and Zulkifli, Zurita
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- 2023
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3. Post-deposition heat treatment effect on pH sensing behavior of chemical bath deposited nanostructured zinc oxide
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Binti Rosli, Aimi Bazilah, Binti Hamid, Nur Hazirah, Bin Zulkefle, Muhammad Alhadi, Binti Shariffudin, Shafinaz Sobihana, Binti Abdullah, Wan Fazlida Hanim, and Herman, Sukreen Hana
- Published
- 2023
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4. Quasi-distributed sol-gel coated fiber optic oxygen sensing probe
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Zolkapli, Maizatul, Saharudin, Suhairi, Herman, Sukreen Hana, and Abdullah, Wan Fazlida Hanim
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- 2018
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5. Fabrication and characterisation of fluidic based memristor sensor for liquid with hydroxyl group
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Mohamad Hadis, Nor Shahanim, Abd Manaf, Asrulnizam, Ngalim, Siti Hawa, and Herman, Sukreen Hana
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- 2017
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6. The Sensitivity Behavior of TiO2 Thin Films-based Extended-Gate Field Effect Transistor pH Sensor.
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Zainal, Nurbaya, Herman, Sukreen Hana, Illias, Nawwaarah Izzati, Zulkefle, Muhammad Alhadi, Kamarozaman, Nur Syahirah, and Zulkifli, Zurita
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FIELD-effect transistors , *SPIN coating , *PH effect , *DETECTORS , *METAL fabrication , *METALLIC oxides , *SPIN labels - Abstract
To present highly sensitive and precise pH sensor, fabrication of metal oxide based EGFET sensor is needed. The used of TiO2 thin films as sensing electrode for pH sensor is widely known for its best sensitive in pH measurement. The films were prepared by depositing the films onto ITO glass substrate using sol-gel spin coating method. The sensitivity and linearity of TiO2 EGFET sensing electrode for various spin speeds (1000 to 5000 rpm) were obtained from transfer characteristic (IDS -VREF) and output characteristics (IDS -VDS) analysis. The effect of different immersion time (25, 50, and 75 s) and repeatability measurement for each sample were also investigated in this study. Among of all samples, the sensing electrode prepared at 5000 rpm spin speed with 75 s immersion time achieved the highest sensitivity of 52.20 mV/pH and good linearity of 99.64 %. Meanwhile, the sensing electrode prepared at spin speed 3000 rpm produced good repeatability and small standard deviation. The performance EGFET sensor has also been tested at different pH values (pH4, pH7, and pH10) and found TiO2 sensing electrode showed more precise results in an alkaline (pH10). [ABSTRACT FROM AUTHOR]
- Published
- 2022
7. Annealing Effect on the EGFET Based pH Sensing Performance of Solgel Spin-coated CuO Thin Film.
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Kamarozaman, Nur Syahirah, Zulkefle, Muhammad Alhadi, Rahman, Rohanieza Abdul, Rosli, Aimi Bazilah, Zainal, Nurbaya, Him, Nik Raikhan Nik, Herman, Sukreen Hana, and Zulkifli, Zurita
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THIN films ,FIELD-effect transistors ,COPPER oxide ,FIELD emission electron microscopy ,INDIUM tin oxide - Abstract
In this study, the effect of annealing temperature on the extended gate field effect transistor (EGFET) for pH sensors of CuO thin film was investigated. The CuO thin films were deposited on an indium tin oxide (ITO) substrate using the sol-gel spin-coating method. The thin films were then annealed in air ambient at 200 to 500 °C for 30 minutes. The sensitivity and linearity of the sensing electrodes were determined in a pH range from pH 2, 4, 7, 10 and 12. The sensing electrode annealed at 400 °C showed the highest pH sensitivity of 47.3 mV/pH. It showed that the post-annealing process improved the sensing performance of the device. The morphology characteristic was characterized by field emission scanning electron microscopy (FESEM) and showed a porous structure as the annealing temperature increased, indicating that the porous film could be the sensing electrode of an EGFET pH sensor. The hysteresis of the sensing electrode was measured in buffer solutions prepared at pH 7, pH 4, pH 7, pH 10, and pH 7 to find its pH response delay. These findings indicated that sol-gel spin-coated CuO thin film can be considered a promising candidate for applications as an EGFET-pH sensor. [ABSTRACT FROM AUTHOR]
- Published
- 2022
8. Highly Sensitive and Selective Sol-Gel Spin-Coated Composite TiO 2 –PANI Thin Films for EGFET-pH Sensor.
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Kamarozaman, Nur Syahirah, Zainal, Nurbaya, Rosli, Aimi Bazilah, Zulkefle, Muhammad Alhadi, Nik Him, Nik Raikhan, Abdullah, Wan Fazlida Hanim, Herman, Sukreen Hana, and Zulkifli, Zurita
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TITANIUM dioxide films ,SOL-gel processes ,POLYANILINES ,SPIN coating ,ELECTRODES - Abstract
A highly selective and sensitive EGFET-pH sensor based on composite TiO
2 –PANI had been developed in this work. A sol-gel titanium dioxide (TiO2 ) and the composite of TiO2 with semiconducting polyaniline (PANI) were deposited using a simple spin-coating method on an indium tin oxide (ITO) substrate. The films have been explored as a sensing electrode (SE) of extended gate field-effect transistor (EGFET) for pH applications in the range of pH 2 to 12. The pH sensitivities between TiO2 , TiO2 –PANI bilayer composite, and TiO2 –PANI composite thin films were discussed. Among these, the TiO2 –PANI composite thin film showed a super-Nernstian behavior with high sensitivity of 66.1 mV/pH and linearity of 0.9931; good repeatability with a standard deviation of 0.49%; a low hysteresis value of 3 mV; and drift rates of 4.96, 5.54, and 3.32 mV/h in pH 4, 7, and 10, respectively, for 6 h. Upon applying the TiO2 –PANI composite as the SE for nitrate measurement, low sensitivity of 12.9 mV/dec was obtained, indicating that this film is a highly selective sensing electrode as a pH sensor. The surface morphology and crystallinity of the thin films were also discussed. [ABSTRACT FROM AUTHOR]- Published
- 2022
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9. Trends of deposition and patterning techniques of TiO2 for memristor based bio-sensing applications
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Mohamad Hadis, Nor Shahanim, Manaf, Asrulnizam Abd, and Herman, Sukreen Hana
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- 2013
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10. Low-temperature Fabrication of a Crystallized Si Film Deposited on a Glass Substrate using an Yttria-stabilized Zirconia Seed Layer
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Herman, Sukreen Hana and Horita, Susumu
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- 2008
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11. The investigation of electromagnetic radiation (EMR) for normal exercise and intense exercise difference in gender.
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Ahmad, F. H., Kadir, R. S. S. A., Murat, Zunairah Hj., Johari, N. S., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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EXERCISE ,ELECTROMAGNETIC radiation ,FREQUENCY discriminators ,HUMAN body - Abstract
This paper is mainly concern on the Electromagnetic Radiation (EMR) produced by human body, focusing on the effects of the normal and intense exercise for different gender. It involved 30 sample of healthy students different in gender to perform the normal exercise and intense exercise. A frequency detector is used to measure the human body frequency and hence later will be converted into color as given by the frequency color table. Next, the health score of the sample will be calculated and categorized. The finding shows that healthy male samples produced high radiation as compared to healthy female samples. The result also shows that the female is good to do normal exercise and intense exercise compared to male samples. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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12. Intervention of super brain yoga towards brainwave balancing index, brainwave dominance and short term memory.
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Murat, Zunairah Haji, Muhsin, A. F. Mohd, Kadir, R. S. S. A., Ahmad, F. H., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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SHORT-term memory ,MEMORY span ,YOGA ,SOCIAL dominance ,EXERCISE ,BENCH press - Abstract
This study investigates the intervention of Super Brain Yoga (SBY) towards improving Brainwave Balancing Index (BBI), Brainwave Dominance and Short Term Memory (STM). A group of 36 participants from UiTM Shah Alam, Malaysia perform the SBY exercise for 2 weeks with repetitions of 30 times twice a day. Electroencephalogram (EEG) recording is carried out to measure the BBI and Brainwave Dominance. In addition, a test on STM using digit span test is carried out before and after the SBY intervention. The result shows that BBI of the participants increases by 33% after practising SBY. Digit span test shows improvement of 33% for the forward test while increment of 42% for the backward test. The participants can remember more digit item especially on the backward test. [ABSTRACT FROM AUTHOR]
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- 2020
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13. Design of intelligent carbon dioxide and lighting system for environmental monitoring.
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Ahmad, Mohammad Asyraf Ali, Sulaiman, Suhana, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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ENVIRONMENTAL monitoring ,CARBON dioxide ,LIGHT intensity ,HOUSE construction ,READING - Abstract
This project presents carbon dioxide (CO
2 ) monitoring system to alert the user on CO2 reading and lighting controller for light intensity via smartphone. Both hardware and software has been integrated to detect the level of CO2 for healthier lifestyle through wireless technology. The system also inclu des a controller to control the lighting system as it could reduce the electric consumption from the light intensity reading. In addition, an application of IoT has been embedded to the system to provide notification for the user and to control the lighting effect cause by the CO2 reading. Several works on CO2 monitoring system present monitoring system without considering the electric consumption. In addition, the existing CO2 also impractical because it only produced an alarm when high concentration of CO2 was detected and without the concentration value to notify the user. In this work, the system consists of two main components which are MQ135 module as the input for CO2 , BH1750 sensor was used to measured light intensity and Wi-Fi module as the switch to turn ON and OFF the sensor. To illustrate the concept idea, the functionality of the system has been tested using L.E.D, buzzer and LCD as the output when CO2 was detected and to display the reading of CO2 level respectively. Three different areas for the system has been selected for testing purposes– residential area, construction area and main road. The finding revealed that main road captured the highest reading of CO2 compared to residential area and construction area. The reading of light intensity at the main road displayed the highest compared to the residential area and construction area. [ABSTRACT FROM AUTHOR]- Published
- 2020
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14. Design of domestic water meter using Arduino.
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Azmi, Muhammad Afif Shazmin Bin, Sulaiman, Suhana, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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WATER meters ,HALL effect transducers ,WATER use ,WATER consumption ,WATER management - Abstract
This study was conducted to develop a system to monitor water consumption and calculate the expected bill in real time. The system was developed for domestic purposes using the hall's effect sensor, Arduino, and wi-fi module for the regular water meter. Currently, most of consumer were not aware of good water management. In other word, a method to save their water usage and any medium for monitoring their water consumption. Thus, in this work, new electronics graphical through smartphone to assist water consumer is introduced. The data on water consumption will assist the consumer to be more flexible in their saving as well as water usage. This method will display the amount of water and billings by employing YF-S201 and ESP8266 sensor. The result is analyzed through "Thingspeak" application for data measurement. This finding shows the data measured by the sensor are approximately similar as the expected amount of water consumption that contribute to their billing cost. [ABSTRACT FROM AUTHOR]
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- 2020
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15. A study of dopant affects the silicon pore formation using electrochemical etching process.
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Burham, N., Yaakub, T. N. T., Aziz, A. A., Masrie, M., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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SILICON ,AQUEOUS electrolytes ,ETCHING ,DOPING agents (Chemistry) ,NANOSILICON ,HYDROFLUORIC acid - Abstract
This paper studies the parameters that affect the pore shape and the pore size diameter of silicon membrane. Electrochemical etching is performed in order to characterize the parameter involved in this process. In the first part of experiment will study the effect of dopant in order to form pore on silicon substrate. Pores is formed under p-type and n-type silicon is compared with undoped silicon to characterize size and pore shape. From this experiment show that dopant silicon able to produce two pore shape which is slit pore under p-type silicon and circular shape under n-type and undoped silicon. The next experiment studied the effect of different volume ratio of hydrofluoric acid (HF) and ethanol as an electrolyte aqueous for electrochemical etch on undoped silicon. The electrolyte aqueous is mixed with HF and ethanol with 4 different volume ratio which is 3:7, 5:5, 7:3 and 9:1. As a result, the higher volume of HF in this electrolyte gives the smallest pore size diameter compared to the lower volume of HF. At the end of the project shows that by manipulating dopant and HF concentration will affect the pore formation on silicon substrate. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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16. Preliminary study of the polymesoda expansa based hydroxyapatite for medical devices coating application.
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Roslan, M. Riza, Nasir, N. F. Mohd, Gilani, M. A., Mohammad, Nur Farahiyah, Cheng, E. M, Khalid, M. F. Abdul, Zoolfakar, A. S., Amin, N. A. M., Khan, S. F., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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HYDROXYAPATITE ,MEDICAL equipment ,FOURIER transform infrared spectroscopy ,CALCIUM phosphate ,SCANNING electron microscopy ,WASTE products ,MEDICAL equipment safety measures - Abstract
Hydroxyapatite (HA) which is a group of calcium phosphate (CaP) is used as a medical devices coating due to its ability to increase the bioactivity and biocompatibility of the device surface. The attraction of using waste seashells products is interesting due to its sustainability and low cost solution especially in biomedical application. Polymesoda expansa or locally known as Lokan is potentially rich with calcium carbonate (CaCO
3 ). Here, the synthesis of HA was done via precipitation method by utilizing the Polymesoda expansa (Lokan) shells as the resource of calcium precursors. Hydroxyapatite synthesized from Polymesoda expansa was carried out with different pH solution (pH 9 and 13) in alkaline environment. The effects of pH on the morphological and chemical composition properties as well as the Ca/P ratio of HA powders were analyzed through Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and Energy Dispersive X-ray Spectrometry (EDS). The finding demonstrates as the pH increases, the calcium apatite reduced and this had increases the Ca/P ratio. [ABSTRACT FROM AUTHOR]- Published
- 2020
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17. The effect of ball milling speed to the synthesis of graphite particle from local coconut shell charcoal via top down approach.
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Omar, H., Malek, N. S. A., Sulimai, N. H., Khusaimi, Z., Abdullah, S., Rusop, M., Asli, N. A., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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CHARCOAL ,BALL mills ,GRAPHITE ,COCONUT ,GRAPHENE synthesis ,PARTICLES - Abstract
Graphite particle from local coconut shell charcoal has recently attract researcher nowadays due to its application as natural graphite source in synthesis graphene and graphene oxide. In this research, coconut shell charcoal were used as the material to synthesis graphite particle using ball mill method. Coconut shell charcoal were mesh for control sample and also ball milled using three different speed which are 200 rpm, 300 rpm and 400 rpm. Particle size analysis shows coconut shell charcoal powder were in micro size which at ball milled speed 200 rpm reveal the smallest size z-average of 1116nm. From Raman spectroscopy, coconut shell charcoal were proved to be source material of graphite based on the existence of D-band at 1339.65 cm
-1 , G-band at 1589 cm−1 and 2D-band at 2681 cm−1 .Structural properties of graphite particle were analysed using x-diffraction and it was confirmed that the structure of graphite were amorphous based on the broad band occur at 2Theta 19° to 30°. [ABSTRACT FROM AUTHOR]- Published
- 2020
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18. Influence of PVP concentration and mixed solvents on the morphology of SnO2 nanofibers via electrospinning.
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Aziz, A. A., Ghazali, M. H. S. M., Zakri, M. R., Kadir, R. A., Burham, N., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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NANOFIBERS ,TIN oxides ,SOLVENTS ,ELECTROSPINNING ,MORPHOLOGY ,QUARTZ - Abstract
This research investigates the various of a Polyvinylpyrrolidone (PVP)/Stannous Chloride nanofiber in morphology by electrospinning. Polyvinylpyrrolidone (PVP)/Stannous Chloride nanofiber were electrospun using a series of PVP concentration (8, 10 and 12 wt%) dissolved in different solvent EtOH/DMF mixture ratio (100:0, 60:40, 50:50, 40:60, 0:100). The quartz substrate with Polyvinylpyrrolidone (PVP)/Stannous Chloride nanofibers are annealed at 800°C for 2 hours to produce SnO
2 nanofibers of a crystalline phase of rutile cassiterite. As observed, the distribution of SnO2 are continuos and random and can reach micrometer long in range. The different PVP concentration and mixed EtOH/DMF solvent produces different SnO2 nanofibers morphologies in size were observed. The best result of nanofiber morphology was from 10% PVP with solvent mixtures EtOH/DMF at 50:50 which produced SnO2 nanofiber with diameter 82nm. [ABSTRACT FROM AUTHOR]- Published
- 2020
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19. Classification of ambulance siren sound with MFCC-SVM.
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Suhaimy, Muhammad Afiq, Halim, Ili Shairah Abdul, Hassan, Siti Lailatul Mohd, Saparon, Azilah, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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AMBULANCES ,PATTERN recognition systems ,ARTIFICIAL intelligence ,SIGNAL processing ,MACHINE learning - Abstract
In both pattern recognition and artificial intelligence, audio identification has very broad theoretical and practical values. The noise from the surrounding area such as transportation, weather, and people's action affected the interruption in signal processing. Current traffic light system is lack of information when a vehicle is in emergencies such as ambulance, firefighter, and police. This paper is designed to develop an embedded machine learning application, including data acquisition, extraction of features, exploration of different algorithms, tuning for a good performance model and deploying the model in a simulation application. Specifically, a classifier of ambulance siren sound into 'Ambulance Arrive' and 'No Ambulance Arrive' has been developed, which could be used in the traffic light system to monitor the arrival of an ambulance which in an emergency. This paper suggests an approach based on Mel-frequency cepstral coefficients-Support Vector Machine (MFCC-SVM) on MATLAB R2017b tools that take advantage of the effect of feature representation and learner optimization tasks to effectively distinguish audio events from audio signals. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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20. Detecting drowsy driver using photoplethysmography sensor.
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Lotfy, Nur Eleena Binti Mohamed, Saparon, Azilah, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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PHOTOPLETHYSMOGRAPHY ,HEART beat ,DROWSINESS ,DETECTORS ,TRAFFIC accidents - Abstract
Drowsiness while driving is one major factor of traffic accident. A reliable detection system for drowsiness could alert the driver before accident happens. In this paper, a non-invasive and inexpensive drowsiness detection system that uses photoplethysmography (PPG) sensor which detects driver's Heart Rate Variability (HRV) pulse wave is described. The process involves taking measurement using the sensor on human fingers, finding the threshold value for drowsy people and implementing the system for real application which is providing signal at Arduino to alert the driver. It can be concluded that a device to detect drowsiness level of a driver by taking non-intrusive physiological measures can be integrated in a system. This system can be used to warn driver beforehand to avoid accident due to drowsiness. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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21. Video based human activities recognition using deep learning.
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Roubleh, A. A., Khalifa, O. O., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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HUMAN activity recognition ,DEEP learning ,COMPUTER vision ,MOTION capture (Human mechanics) ,HUMAN behavior ,INFORMATION resources - Abstract
Human activities recognition from motion capture data is a challenging problem in the computer vision due to the fact that, in various human activities, different body components have distinctive characteristics in terms of the moving pattern. In this paper, a learning method of detecting an activity from different angles based on various sources of information is proposed. with high accuracy. The bottom up approach is used in OpenPose which is the tool used in this paper's experiments. The proposed method achieves promising results on Berkeley Multimodal Human Action Database (MHAD) datasets at 98% accuracy. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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22. The effect of annealing time on tungsten-doped vanadium dioxide by using sol-gel spin coating method.
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Hashim, H., Mohamed, A. S., Ibrahim, M. Y., Shariffudin, S. S., Sarah, M. S. P., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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VANADIUM dioxide ,SPIN coating ,FIELD emission electron microscopy ,THERMOCHROMISM ,ELECTROCHROMIC windows ,OPTICAL measurements ,ANNEALING of metals - Abstract
Vanadium dioxide is a good and attractive material for application of smart window coating and sensor. The main objective of this research is to fabricate and characterize the tungsten doped vanadium dioxide thin films. Sol-gel spin coating method was used because this technique was a good process for preparing the pure vanadium dioxide (VO
2 ) thin films. Five samples of tungsten doped VO2 thin films with different annealing times parameter were fabricated on quartz substrates. Isopropanol was used as the precursor that added to the tungsten doped vanadium dioxide. All samples have been characterized for the surface morphology and thickness using field emission scanning electron microscopy (FESEM). While the electrical properties were measured by current-voltage (I-V) measurement system and the optical properties were characterized via ultraviolet-visible (UV-Vis) spectrophotometer. A linear graph shows the effect of absorbance of the tungsten-doped vanadium dioxide. Longer annealing treatment at 5 hours and 550 °C results in a lower resistivity and a higher conductivity which are 0.65 Ωm and 1.54 (Ωm)−1 respectively. In a conclusion, the effect of different annealing times successfully characterizes electrical properties, optical properties and surface morphology of tungsten-doped vanadium dioxide thin films. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
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23. Deep learning for environmentally robust speech recognition.
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Alhamada, A. I., Khalifa, O. O., Abdalla, A. H., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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DEEP learning ,SPEECH perception ,CONVOLUTIONAL neural networks ,AUTOMATIC speech recognition ,ARTIFICIAL intelligence - Abstract
Deep learning is an emerging technology that is one of the most promising areas of artificial intelligence. Great strides have been made in recent years which resulted in increased efficiency with regards to many applications, including speech. Despite this, an environmentally Robust Speech Recognition system is still far from being achieved. In this article, an investigation of previous work has been conducted. The use of deep learning in speech recognition was analyzed and a proper deep learning architecture was identified. A method using convolutional neural network (CNN) is used with the aim of enhancing the performance of speech recognition systems (SRS). This study found that this CNN-based approach achieves a 94.32% validated accuracy [ABSTRACT FROM AUTHOR]
- Published
- 2020
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24. Different direction of bias voltage on the memristive behaviour of sputtered titania thin film.
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Kamarozaman, Nur Syahirah, Bakar, Raudah Abu, Herman, Sukreen Hana, Shariffudin, Shafinaz Sobihana, and Hashim, Hashimah
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THIN films ,BEHAVIOR - Abstract
This paper presents the effect of different direction of bias voltage on the memristive behaviour of sputtered titania thin films by varying the I-V measurement with positive direction of bias voltage ranging from 0V to 5V, 5V to - 5V and -5V to 0V (0 V→+5 V→-5 V→0 V : positive loop) and negative direction of bias voltage ranging from 0V to - 5V, -5V to 5V, and 5V to 0V(0 V→-5 V→+5 V→0 V : negative loop). Titania thin film was deposited by sputtering method sandwiched between Platinum (Pt) and ITO-coated glass substrate to form metal-insulator-metal (MIM) structure which is the fundamental structure of memristive device. Structural and electrical properties of the samples were studied. The result shows that the film thickness decreases as the oxygen flow rate increases during deposition process. Based on the I-V characteristics, starting the positive sweep voltage result in the better switching behaviour compared to starting the negative sweep voltage. The switching behaviour is depended the movement of positively charged oxygen vacancies. Thus, the illustration of the schematic diagram on the movement of oxygen vacancies in the active layer is proposed in this paper. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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25. Polyvinylpyrrolidone matrix concentration effects on the physical properties of TiO2 nanofibers prepared using electrospinning method.
- Author
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Zulkefle, M. A., Abid, S. A. U. S. M., Rahman, R. A., Zulkifli, Z., Herman, S. H., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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MATRIX effect ,TITANIUM dioxide ,POVIDONE ,NANOFIBERS ,ELECTROSPINNING ,POLYMER colloids - Abstract
Polymer plays vital role in assisting fibers (micro or nano) formation via electrospinning method. In this study polyvinylpyrrolidone (PVP) was used and the concentration of the polymer was manipulated by varying its weight percent in the sol-gel solution. From the images obtained, it was observed that solution with low polymer concentration produced few but very small fibers. Increasing the polymer concentration in the sol-gel solution resulted in larger number of fibers being formed but it also increases the fibers diameter size. In term of roughness, sample with 12.5 wt% PVP has coarser surface of 327 nm while sample with 2.5 wt% has smoother surface of 22.559 nm. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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26. Wireless power transfer for electric vehicle charging.
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Ahmed, A. M., Khalifa, O. O., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
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WIRELESS power transmission ,ELECTRIC power ,ELECTRIC vehicles - Abstract
Wireless power transfer is becoming a main concern to everyone staring from technical producer to the user. It becomes essential to create elective techniques to produce vitality. Wireless Power Transfer can be utilized to charge electronic versatile gadgets and Electrical Vehicle also In this paper, the methods of Wireless Power Transfer is talked about and how its identified with the Wireless Power Transfer for electric vehicle is introduced. A unique Inductive force move technique is proposed. A dynamic Inductive power transfer method is proposed. A simulation and experimental implementation were conducted. The testing with different situations in terms of distance and alignment also performed where the wireless charging was achieved an efficiency of 90%. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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27. Design and sizing water pumping system powered by photovoltaic.
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Arifin, A. I. Mod, Redzuan, F. N. Mohd, Kadir, E. Abd, Ismail, N., Zain, M. F. Mohd, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
PHOTOVOLTAIC power systems ,WATER pumps ,SOLAR pumps ,ON-chip charge pumps ,SOLAR energy ,ENERGY consumption ,ELECTRIC power - Abstract
The deficit in electricity and high diesel costs affects the pumping requirements of community water supplies and irrigation; so using solar energy for water pumping is a promising alternative to conventional electricity and diesel based pumping systems. Water pumping system has a long history, so many methods have been developed to pump water. Manual pumping is the common method for many years, but it is impractical for many applications, such as unmanned or remote wells. Many pumping systems require an independent power source like an engine or electric power. Engines can provide the higher amount of the water, but they are requiring the fuel and regular maintenance. Due to minimize the cost the alternative source is used such as solar energy. This paper presents the study of a water pumping system powered by photovoltaics (PV) solar. The purpose of this article is to design, optimum sizing the batteries and the PV modules for the water pumping system and also to study about the characteristic of charging and discharging the batteries. Optimum sizing from SANDIA National Laboratories were used in sizing this system. The system based on the standalone system configuration which contains PV module, charge controller, batteries, and load. Based on this research, the design and sizing are able to running the system within the desired autonomy. The pattern of charging and discharging also been captured during this research. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
28. Deep learning for emotional speech recognition.
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Alhamada, M. I., Khalifa, O. O., Abdalla, A. H., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
SPEECH perception ,DEEP learning ,EMOTION recognition ,AUTOMATIC speech recognition ,EMOTIONS ,MACHINE learning - Abstract
Emotion speech recognition is a developing field in machine learning. The main purpose of this field is to produce a convenient system that is able to effortlessly communicate and interact with humans. The reliability of the current speech emotion recognition systems is far from being achieved. However, this is a challenging task due to the gap between acoustic features and human emotions, which rely strongly on the discriminative acoustic features extracted for a given recognition task. The speech signals were process with information which is divided into two main categories, linguistic and paralinguistic; emotions belong to the latter tree. The aim of this work is to develop a system that can understand paralinguistic information for paramount better human-machine interactions. A different extracted features like MFCC as well as feature classifications methods like HMM, GMM, LTSTM and ANN were used. In this paper, an improved architecture of CNN for speech emotion recognition were implemented. The main finding that the proposed CNN model achieved 93.96% accuracy rate in detecting emotions. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
29. Develop passive spectrum monitoring solution for electronic warfare.
- Author
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Jamlos, Mohd Aminudin, Mustafa, Wan Azani, Mutaqqiin, Ahmad, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
MILITARY electronics ,ELECTRONIC surveillance ,REMOTE control ,RASPBERRY Pi ,PERSONAL computers ,COMPUTER operating systems - Abstract
Passive spectrum monitoring solution device is essentially required for the telco industry and military. There are few objectives for this project. This futuristic device can detect any spectrum that lingering around in free space. With this device, it is lightweight and can carry to anywhere at any time. Moreover, it is cheap and affordable to be purchased. Simple circuit is used for the assembly of the hardware to ease for any troubleshoot. 1.8GHz rectangular patch antenna is used for receiving the input signal from the free space. In order to design the antenna, CST software is used to do simulation for the designed antenna. It can detect any spectrum from 24MHz to 1766 MHz as it using Rafael Micro R820T, which is RTL-SDR dongle for the tuner. Thus, the signal can be processed by using a microcontroller called as Raspberry Pi. Python language is used as coding for the software application. Raspbian OS, which is an operating system for the Raspberry Pi has been installed so that the microcontroller can be used as desktop like a computer. It acquired power supply from the powerbank, which can be carried around without getting attached by the power supply socket. A 3.5" LCD touchscreen attached on top of the microcontroller is used as the interface of the Raspbian OS and monitor the output of the project. Last but not least, SSH connection is used as Internet of Things (IoT) to act as remote control from the phone. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
30. Implementation of digital magnitude comparator circuit on memristor crossbar array using memristor-aided logic.
- Author
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Haron, Adib, Ruslan, Hakim, Osman, Nazmie, Mutalib, Syed, Idros, Faizul, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
COMPARATOR circuits ,DIGITAL maps ,DATA encryption ,LOGIC ,ENERGY consumption - Abstract
One of Von Neumann architecture's most important limitations is the minimal memory-processor bandwidth. In the processor itself, the cost of moving data back and forth between memory and processor is significantly higher than the processing. This architecture has a significant impact on the Big Data and data-intensive application, such as data encryption and decryption analysis that spends most of the processing time moving data. The principle of in-memory processing, which is based on the ability to perform the logic operation on the physical memory structure using a crossbar topology and non-volatile resistive-switching memristor technology, has recently been proposed. This paper presents a scheme to map the digital magnitude comparator circuit on the memristive memory crossbar array. Memristor-aided logic is used to map the 2-bit, 4-bit, 8-bit, 16-bit, 32-bit, and 64-bit magnitude comparator circuit on the memristive memory crossbar array. The simulation results show that, for the 64-bit word size, the parallel mapping exhibits 1.8 better performance in total ex×ecution time than sequential mapping but has a trade-off in terms of energy consumption and area utilization. Meanwhile, the total crossbar area can be reduced by 1.4 for sequential mapping and 2.5 for parallel mapping both by using the overlapping technique. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
31. Optimised window selection for harmonic signal detection using Short Time Fourier Transform.
- Author
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Basir, M. S. S. M., Yusof, K. H., Faisal, B., Shahadan, N. H., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
FOURIER transforms ,TIME management ,SIGNAL detection - Abstract
This paper presents a comparative study on various types of windows by using Short Time Fourier Transform (STFT) method. Types of windows which had been analysed were triangular, Hanning, hamming, Blackman and Gaussian. In selecting optimum window type and length, performance in term of accuracy by mean absolute percentage error (MAPE) and memory using statistical approaches had been identified. The system had been tested on5000samples, with sampling frequency set at 12000 Hz. The range of window length was set from 32 to 8192 for every window type. The outcome showed that the proposed Blackman window, with length of512gavethe most accurate value, while maintaining the system memory as low as possible. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
32. Feasibility study of detecting palm oil adulteration with recycled cooking oil using a handheld NIR spectroscopy.
- Author
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Irfan, Umair Bin, Pui, Liew Phing, Solihin, Mahmud Iwan, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
ADULTERATIONS ,FRIED chicken ,NEAR infrared spectroscopy ,PALM oil ,FOOD adulteration ,PETROLEUM waste ,FRENCH fries ,FRAUD investigation - Abstract
Adulterated foods are causing health-related issues since there is no rapid method available for the detection of food fraud. The main objective of this study is to determine the feasibility of using near-infrared (NIR) spectroscopy in differentiating pure palm oil from palm oil adulterated with recycled cooking oil in varying concentrations. The deep-frying process was carried out for chicken nuggets and French fries as fried items using palm oil as a frying medium to produce used frying oil. The refining and bleaching process was applied to used frying oil to generate recycled cooking oil. Adulterated samples were developed with different concentrations of recycled cooking oil in pure palm oil (1%, 2%, 3%, 5%, 10%, 15%, 20%, 30%, 40% and 50%). Principal component analysis was applied to analyze the distribution of pure and adulterated palm oil samples. The classification accuracy of the proposed method using handheld NIR spectroscopy in distinguishing adulterated samples of lower concentrations was found to be low (below 50%). Adulterated palm oil samples of recycled cooking oil (RCO) concentration (15% and above) were found to show classification accuracy of 100% when detected through handheld NIR spectroscopy. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
33. Developing water monitoring system.
- Author
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Jamlos, Mohd Aminudin, Mustafa, Wan Azani, Amin, Muhammad Zahir, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
RASPBERRY Pi ,WATER depth ,WATER ,READING ,TURBIDITY - Abstract
Water monitoring system is a system than monitor the condition of water. This system monitor the water on several condition. The condition monitored by this system is water level and turbidity value. For water level, the depth of the water is taken by ultrasonic method. For turbidity, the higher the reading from the sensor, the higher the turbidity of the water. For pH value, if the value of the reading is more than 7, the water is in alkaline condition. If the value of reading is less than 7, the water is in acidic condition.In this project, this system is using Raspberry Pi 2 as its main controller. Several sensor are used such as ultrasonic sensor and turbidity sensor. The reading from the sensor is then send to Raspberry Pi and the the value is send to the other devices or webpage through wifi module. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
34. Estimation of pull-in phenomena in carbon nanotubes based micro/nanobeam cantilevers.
- Author
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Sourab, Abdelrahim A., Sultan, Suhana M., Ismail, Razali, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
CARBON nanotubes ,MEMS resonators ,MICROCANTILEVERS ,CANTILEVERS ,FINITE element method ,NANOELECTROMECHANICAL systems - Abstract
In this paper, a Finite Element Method based simulation tool is used to estimate the pull-in phenomena of MWCNT based cantilever micro/nanobeams. In particular, different MWCNT micro/nanobeams are studied under electrostatic actuation. The pull-in voltage and height simulation results are verified by analytically driven formula and show the expected agreement. Making use of the quick predicting analytical formula accompanied by the simulation tool reported here is of particular usefulness in the design of micro/nanobeams implemented in different MEMS/NEMS devices such as switches and resonators. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
35. Feasibility of fraud detection in milk powder using a handheld near-infrared spectroscopy.
- Author
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Ting, Ding Fang, Pui, Liew Phing, Solihin, Mahmud Iwan, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
NEAR infrared spectroscopy ,FRAUD investigation ,DRIED milk ,ADULTERATIONS ,FOOD adulteration ,PRINCIPAL components analysis ,MILK quality - Abstract
Food fraud had become a global food safety concern. Food adulteration is the top of the concern list when talking about food fraud. For example, the melamine incident obtained significant attention from worldwide due to its misuse as a food adulterant. It is a nitrogen-rich substance always added purposely to food such as milk powder to increase the apparent protein content and the profit without using expensive materials. It may lead to serious illness or death if the melamine content exceeds the permitted amount. Thus, the demanding safety and quality of the milk powder increased. This research will study effective and rapid fraud detection in milk powder by using near-infrared spectroscopy (NIR). Melamine was added to milk powder with different concentrations and detected it by near-infrared spectroscopy. The total of 130 spectral data from 10 adulterated samples and 30 unadulterated samples with 3 different lighting condition. The results data will be interpreted by using Principal Component Analysis (PCA) and Logistics Regression (LR) to discriminate between adulterated and unadulterated samples. From the results, detection accuracy of 100 % can be achieved on training and independent test set after spectra pre-processing. The results show the feasibility of NIR with the combination of PCA and LR as it can use as a fast screening tool for fraud detection in milk powder. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
36. Anodization voltage effect on physical properties of anodic TiO2 nanotube arrays film.
- Author
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Azhar, N. E. A., Munirah, S., Rani, R. Abdul, Shuhaimi, A., Malek, M. F., Mamat, M. H., Shariffudin, S. S., Rusop, M., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
ANODIC oxidation of metals ,BAND gaps ,TITANIUM dioxide ,N-type semiconductors ,OHMIC contacts ,SURFACE morphology - Abstract
Titanium dioxide (TiO
2 ) material have received attention due to their performance in optoelectronics especially in light emission diode (LED) devices. The TiO2 nanotubes array (NTAs) film was synthesized by electrochemical anodization method at different anodizing voltages at room temperature. The surface morphology revealed that sample anodized voltage at 35V showed uniformity with a regular porous on top layer of TiO2 . The optical band gap of TiO2 NTAs film shows the decrement of band gap with the increment of anodizing voltage. The current-voltage (I-V) characteristic of TiO2 NTAs film shows the ohmic contact behavior. Non-stoichiometric TiO2 resulted from the oxygen deficiency can be applied to explain the n-type semiconductor behavior. Anodizing voltage at 35V is the highest conductivity and lowest band gap for TiO2 NTAs and suitable used for LED devices. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
37. Fabrication and characterization of multi-walled carbon nanotube for conductive polymer composite.
- Author
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Zambri, Izzaty M., Sultan, Suhana M., Yusof, Yusmeeraz, Addi, Mitra M., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
CONDUCTING polymer composites ,POLYDIMETHYLSILOXANE ,RAMAN spectroscopy ,ISOPROPYL alcohol ,MECHANICAL properties of condensed matter - Abstract
Dry surface electrocardiogram electrode that gives the flexibility and conductivity have been studied before by other researchers using conductive polymer composite. This paper presents the development of Multiwalled Carbon Nanotube (MWCNT) as filler and Polydimethylsiloxane (PDMS) as polymer matrix. Solution mixing has been used to synthesize the MWCNT in Isopropyl Alcohol (IPA) for better dispersion before combining with PDMS which then the mixture were poured into mold. To investigate the material and electrical properties of polymer composite fabricated electrode, Raman Spectroscopy Analysis was used. It was found that, the Raman band for fabricated electrodes have peaks at D-band (1351 cm-1), G-band (1593 cm-1) but there was no peak at 2D-band. This Raman Spectroscopy also being measured for MWCNT powder and pure PDMS in order to distinguish the shape of Raman Graph. From the results obtained, the MWCNT/PDMS composite electrode shows similar shape to pure PDMS Raman spectrum. This indicates the fabricated electrode is not conductive and more inclined towards insulating properties. The electrical test conforms well to the Raman results which shows non-conductive behavior. Further studies need to be executed to determine the optimized weight ratio between MWCNT and PDMS. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
38. Study on ZnO nanostructures characteristics: Growth time dependence.
- Author
-
Rahman, Rohanieza Abdul, Zulkefle, Muhammad AlHadi, Herman, Sukreen Hana, Alip, Rosalena Irma, Shariffudin, Shafinaz Sobihana, and Hashim, Hashimah
- Subjects
FIELD emission electron microscopes ,CHEMICAL solution deposition ,INDIUM tin oxide ,ZINC oxide ,ZINC oxide synthesis ,NANOSTRUCTURES - Abstract
Zinc oxide (ZnO) nanorods were successfully prepared using two-step (spin-coating and chemical bath deposition) process. Indium tin oxide (ITO) substrate was used, and before the growth process, the seed layer of ZnO was prepared on the substrate. In this study, growth time or growth durations were varied, to study its effect towards ZnO nanorod properties. Growth time was varied from 1 hour, 2 hours and 3 hours. Physical, optical and structural characterizations were conducted, to explore the properties of grown ZnO nanorods. Field emission scanning electron microscope determined that morphology structure of ZnO nanorods changes, with distinct growth duration. Ultra-violet visible spectrometer indicates that growth time or growth duration change the optical characteritics of ZnO nanorods thin film, of which transmittance and absorbance affected by the changes of growth duration. In addition, x-ray diffraction shows the crystallinity of ZnO nanorods improved when growth time increased. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
39. A circular equivalent planar array configuration for 5.8 GHz radar application.
- Author
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Asadullah, G. M., Islam, Md Rafiqul, Islam, Md. Shazzadul, Mahfuz, M. M. Hasan, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
PLANAR antenna arrays ,ANTENNA arrays ,DIRECTIONAL antennas ,RADAR ,MIMO radar - Abstract
As the spectrum demand increasing with time, so, the directivity and efficiency of antenna array now become a vital issue. Mostly, researchers have used a planar antenna array to get a high directive antenna with better performances. However, the planar array's gain is limited. It contributes high sidelobe levels and strong mutual coupling effects those need to overcome. In this paper, a new configuration of 4 elements circular equivalent planar array has been proposed to achieve high gain and directivity with lower sidelobe level. After being designed and simulated, the proposed antenna array has achieved high directivity of 15.3 dBi with 85 % radiation efficiency. Besides, the array has a maximum realized gain of 14.51 dB and low sidelobe level of – 15.1 dB. In turn, the high directivity of the proposed antenna array resonating at 5.8 GHz with very minimum return loss makes it suitable for Radar application. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
40. Monitoring system to classify cervical cancer stages based on pap smear nucleus analysis.
- Author
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Halim, Afiqah, Mustafa, Wan Azani, Jamlos, Mohd Aminudin, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
TUMOR classification ,PAP test ,CERVICAL cancer ,CELL nuclei ,CLASSIFICATION - Abstract
Nowadays, in the hospital, cervical cancer is in the higher rank (number two) of the most popular cancer among ladies in the world. This type of cancer develops in the woman's cervix, which the womb is the entrance. The nucleus of the normal cell is in a smaller size compared to the abnormal nucleus. The abnormal nucleus has a bigger size, which sometimes, the size cannot be identified accurately by seeing with bare eyes to classify the stages of cervical cancer. As the solution, to detect and classifying the cells using methods through Pap smear images technique for handling the paper objectives with the better performance required. This method may improve the accuracy of the detection and the classification which to show better performance with the balance data and samples. Based on all of the results classified, the five methods were compared such as Wolf method, Nick method, Niblack method, Bradley method, and Bernsen method has been determined. Then, the Bradley method showed the best result of the cervical cancer threshold which has been chosen in this project. Furthermore, method modification has been made as to the new method of detection for the nucleus successfully proposed as stated in the project objective. After that, the analysis of the specificity, accuracy, PSNR, sensitivity, and F-Measure determined. All of the results of data analysis showed that the proposed method has a high percentage of the accuracy in total average, in which the project system performance of nucleus detection is good. Nevertheless, the analysis of the nucleus feature in terms of size by obtaining the area and the perimeter of the foreground (nucleus) made as the classification of cells were classed into three classes has been successfully made as to the second project objective. The three classes of cells finally success to identify, those are the 'Abnormal Cell', 'Intermediate Cell', and 'Normal Cell'. This study could perhaps encourage researchers throughout the field in seeing the researched risk associated with some of the methods and to provide a solid base for design and implementing new algorithms or implementing new ones. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
41. Design of dual band notched ultra wideband microstrip patch antenna for 5G lower bands application.
- Author
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Mahfuz, M. M. Hasan, Islam, Md Rafiqul, Malek, Norun Abdul, Islam, Md. Shazzadul, Asadullah, G. M., Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
5G networks ,MICROSTRIP antenna arrays ,MICROSTRIP antennas ,ANTENNAS (Electronics) - Abstract
Fifth-generation (5G) forums in ASEAN countries have proposed lower frequency bands for 5G applications at 4.5 – 5.5 GHz and also the fixed-satellite service (FSS) has realised 3.3 – 3.8 GHz in C-band for 5G cellular communication recently, which leads the necessity of proposing antennas for the particular bands. In this paper, a compact ultra-wideband (UWB) patch antenna with dual band-notched characteristics has been proposed for lower 5G bands. The UWB has been achieved with a partial ground plane and further two notched 5G bands have been obtained with a rectangular slot on the patch and by connecting an arc shape open loop (ASOL) on top of the patch. The antenna has achieved a wide – 10 dB bandwidth of around 12.4 GHz (2.91 – 15.3 GHz) and VSWR < 2 except for two notched lower 5G bands of 3.3 – 4.2 GHz and 4.5 – 5.5 GHz. Besides, the proposed antenna has achieved a peak radiation efficiency of more than 80 % for UWB, while at the notched bands as low as 40%. Moreover, the proposed antenna is compact with a dimension of 29×23 mm
2 that makes it suitable for lower 5G bands application. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
42. Determination of Agarwood oil's significant chemical compounds using principal component analysis.
- Author
-
Haron, Mohamad Hushnie, Taib, Mohd Nasir, Ismail, Nurlaila, Ali, Nor Azah Mohd, Tajuddin, Saiful Nizam, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
PRINCIPAL components analysis ,PETROLEUM ,ANALYTICAL chemistry ,MARKET value - Abstract
Agarwood oil is considered a high market value oil and expensive commodity. It consists of a complex mixture of sesquiterpene hydrocarbons, oxygenated sesquiterpenes and chromone derivatives. These chemical compounds contribute to the determination of Agarwood oil quality. In this study, a statistical analysis concentrates on chemical compounds of Agarwood oil is conducted. The chemical compounds were analysed using Principal Components Analysis (PCA). Using GC-MS analysis, the chemical compounds were first identified. Then, PCA with correlation matrix was used to further analyse the data. Scree Plot was used to select valid principal components. To determine the significant chemical compounds, the data under these principal components were rotated using Varimax. 11 chemical compounds were found significant and they can be used in identifying Agarwood oil quality. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
43. Slitting K-means clusters to X-means clusters for prolonging wireless sensor networks lifetime.
- Author
-
Radwan, Abdelrahman, Kamarudin, Nazhatul Hafizah, Solihin, Mahmud Iwan, Leong, Hungyang, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
WIRELESS sensor networks ,K-means clustering ,ENERGY consumption ,CENTROID ,CHILDBIRTH - Abstract
The network lifetime is a vital research area of wireless sensor networks (WSNs), K-means are potential solutions that prolongs the network lifetime. However, there are limitations hampering these algorithms, such as the number of clusters is a fixed value and the initial positions of the cluster centroids are predetermined locations. A bad choice of initial centroids leads to a bad clustering and a high energy consumption, thus this paper proposes two phases optimization of initial centroids called X-means; first K-means cluster formed then they are slit into multiple clusters. In general, clusters constructed using tentative CHs selected by K-means algorithm as an initial phase, After that, each cluster gives birth to children, then these children compete to form clusters and the surviving children are the final clusters. The simulation results showed that X-means outperforms the traditional K-means algorithm and it has reduced energy consumption by optimizing clusters initial positions. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
44. Detection of screw implant on x-ray images using morphology technique.
- Author
-
Salleh, Nurshahira Mohd, Mustafa, Wan Azani, Jamlos, Mohd Aminudin, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
X-ray imaging ,INTERNAL fixation in fractures ,MEDICAL terminology ,INTRAMEDULLARY rods ,BONES ,PHOTOGRAPHIC film - Abstract
Bones make up the skeleton of the body by attachment points for muscles, which allows human to run, jump, and do actions. It also protects organs from potential damages. Fracture is a medical term for a broken bone when bone has an outside force exerted upon it, there is possibility that the bone cannot withstand the amount of force and break it. These fractures can treat by implanting internal fixations at the fractures such as screw and plates. To diagnose the fractures and follow up the treatment, x-ray taken at the fractured area. X-ray image is one of the oldest photographic films that is mostly used in medical diagnosis and treatment. X-ray image is a very useful modality for the physicians and doctors to determine and analyse the bone fracture, which is an important symptom used for diagnosis, therefore x-ray produce only medium quality image, which will normally affect the information of the image. This paper aims to use a new method to detect the screw implants on human bone by using image binarization technique. Image binarization is the process of separating pixel values into a couple of groups, black as foreground and white as background. Image binarization is an important step in image thresholding. The main objective is to find a new method of image thresholding to of object detection. The method is by developing a new algorithm of image thresholding by making the already exist algorithm as references. The resulting method was analysis based on accuracy, sensitivity, and specificity. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
45. Novel dual mode universal filter with grounded passive components employing VD-DDCC.
- Author
-
Albrni, Musa Ali, Sampe, Jahariah, Ali, Sawal Hamid Md, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
PASSIVE components ,CURRENT conveyors ,FILTERS & filtration - Abstract
This paper presents a novel dual mode multifunction filter using Voltage Differencing Differential Difference Current Conveyor (VD-DDCC) as active element. The filter provides low pass (LP), high pass (HP), band pass (BP), notch pass (NP) and all pass (AP) responses in voltage mode (VM) and transadmittance mode (TAM). The filter employs two VD-DDCC, two capacitors and three resistors. All passive components are grounded which is advantageous. The filters have the ability to operate in dual mode and don't require any capacitive matching. Q factor of the filters can be tuned independently of pole frequency. Input impedance for (VM & TAM) is high and output impedance explicit current output for (TAM) is high as well. Double/negative voltage input signals for response realization is not required. The VD-DDCC and the filter circuit is designed and validated in Cadence Virtuoso Analog Design Environment using 0.18µm pdk from Silterra Malaysia at supply voltage of ± 1V. The achieved results are very close to the theoretical finings. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
46. Study the effect of channel doping concentration on electrical properties of SOI MOSFET using Silvaco TCAD simulator.
- Author
-
Bustam, Mohd Shahrul Ashraf, Sauki, Nur Sa'adah Muhamad, Ismail, Lyly Nyl, Sihab, Norsabrina, Razak, Faridah Abdul, Muhamad, Nur Amalina, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
METAL oxide semiconductor field-effect transistors ,DOPING agents (Chemistry) ,MOORE'S law - Abstract
Moore's Law state that, the number of transistors in silicon chip will be doubled every 2 years. The size of Metal Oxide Semiconductor Field Effect Transistor (MOSFET) will be scaled down. MOSFET is a semiconductor device that used for switching and amplifying. As the MOSFET shrunk down, there will be Short Channel Effect (SCE) occur which can affect the performance of chi p. Therefore, Silicon on Insulator (SOI) technology have been introduced as a solution to the problem. The aim of this research is to investigate the effect of channel doping concentration of SOI MOSFET using SILVACO TCAD Simulator. By adding a layer of buried oxide (BOX) on the top of silicon substrate, the electrical characteristic of MOSFET can be improved and the performance will increase. Simulation results were observed using TCAD tools, SILVACO (ATHENA, ATLAS and Tony-Plot). Based on the observation, increasing dose of doping concentration leads to increasing on threshold voltage (V
t ) and decrease the leakage current (Ioff ). [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
47. Light intensity and human machine interface environmental control of a greenhouse system.
- Author
-
Madzhi, Nina Korlina, Izulman, Iman Binti, Shariffudin, Shafinaz Sobihana, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
GREENHOUSES ,LIGHT intensity ,HUMAN-machine systems ,LIGHT emitting diodes ,PLANT growth ,SMARTPHONES - Abstract
This paper presents the regulation of light intensity control of a greenhouse system by using human machine interface. This objective of this paper is to support in the growth of plant even in sunless environment by using light emitting diode (LED). To design the prototype of a greenhouse system, it was built and instrumented with appropriate sensor such as light dependent resistor (Ldr) to measure the light intensity. There is also another factor that will help in the growth of plant such as temperature, humidity and carbon monoxide but this paper will focus more on the light intensity. The method that will be use is by supplying suitable amount of light source for the growth of basil by using combination of red and blue LED's considering their wavelength. Android and MIT application inventor 2 is used to control the light intensity which act as a human machine interface. Arduino (Uno) as a microcontroller and Bluetooth module as interface between Arduino and android. If light dependent resistor (ldr) sense insufficient light, alarm will trigger to alert surrounding. Then press push button, and led will on. By considering suitable light intensity it can be controlled through smart phone. The reading of the light intensity will be measure manually by using lux meter. With this system, it is expected that it can support in the growth of plant such as basil plant even in the sunless environment. To develop the system is easy and cost efficient. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
48. Transfer of graphene onto Pt/Glass substrate for transparent and large area graphene film using low temperature water bath.
- Author
-
Aziz, Tengku Norazman Tengku Abd, Rosli, Aimi Bazilah, Yusoff, Marmeezee Mohd, Herman, Sukreen Hana, Zulkifli, Zurita, Mahmood, Mohamad Rusop, Soga, Tetsuo, Nagaoka, Shiro, Mamat, Mohamad Hafiz, and Jafar, Salifairus Mohammad
- Subjects
GRAPHENE oxide ,PLATINUM ,WATER temperature ,ZINC oxide thin films ,LINEAR systems - Abstract
This paper demonstrates the transfer of graphene at low temperature using water bath. Graphene in water solution (highly opaque) was transferred onto Platinum/Glass (Pt/Glass) substrate and the technique involves no additional chemicals. We obtained high transparency and large area of graphene film that is free of contaminants. The transferred graphene is characterized using FESEM, Raman spectroscopy and I-V measurements. This transfer method enables us to transfer graphene onto ZnO thin film for memristive devices. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
49. Optical pH Sensor Based on Polyaniline Sol-Gel Film Immobilized with Bromothymol Blue and Phenol Red.
- Author
-
Othman, Norliza, Hanim, Wan Fazlida, Noor, Uzer Mohd, and Herman, Sukreen Hana
- Subjects
OPTICAL detectors ,HYDROGEN-ion concentration ,POLYANILINES ,SOL-gel materials ,PHENOL red ,ABSORPTION spectra ,ATOMIC force microscopy - Abstract
Optical absorption spectra of dye doped in polyaniline (PANI) sol-gel films for sensing of pH solutions have been investigated. Accordingly, the glass substrate was coated by dip coating by sol-gel method. The surface morphological and optical characterizations of the deposited films were carried out using Atomic Force Microscopy (AFM) and UV-Vis spectroscopy respectively. The PANI thin film's surface shows high grain with RMS around 26.33nm. The surface of thin film doped with bromothymol blue and phenol red is more regular with large cavities with RMS value around 70.32nm and 39.44nm respectively. Two absorption bands with absorption peak located at 428nm and 619nm are found for bromothymol blue films while 430nm and 554nm for phenol red films. Both dyedoped deposited films are found bromothymol blue is more sensitive to pH environment and show good reversibility. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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50. The Electrical, Optical and Physical Characterizations of Vanadium Dioxide Thin Films by Sol-Gel Spin Coating Method.
- Author
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Yazid, Ibrahim Mohd, Illya, Shariffudin, Shafinaz Sobihana, Mohamad Saad, Puteri Sarah, Herman, Sukreen Hana, and Hashim, Hashimah
- Subjects
VANADIUM dioxide ,THIN films ,SOL-gel processes - Abstract
Vanadium dioxide (VO
2 ) is an inorganic compound with dull blue strong color in original state. A simple sol-gel spin coating method is developed to fabricate the vanadium dioxide thin films. By manipulating VO2 molarity, the fabricated thin films produced a different characterization pattern of electrical, optical, and physical properties. The results were discussed properly in line with smart window application. Quartz substrate were selected as a suitable substrate due to their application of high annealing temperature. To fabricate VO2 thin films, ten pieces of quartz substrates with size of 2cm x 2cm were prepared. Then, vanadium oxytriisopropoxide was mixed with isopropanol in a dry and clean beaker to form a stable precursor before continuing with spin coater, thermal evaporation, and annealing process with a standard operation set-up. The samples were then characterized by I-V measurement system and ultraviolet-visible (UV-Vis) spectrophotometry for absorbance and transmittance measurements before continuing with Field Emission Scanning Electron Spectroscopy (FESEM) for thickness measurement via cross section process and surface morphology of the grains. The optimum I-V measurements showed that 1.0M produced a better conductivity with lowest resistance value which was 0.35 Ohm. The results for UV-Vis spectrometry also proved that the higher molarity of precursor produced better thin films characterization in terms of absorbance and transmittance. The range of measured thickness and size of grain were 183nm to 750nm and 300nm to 330nm respectively. The results showed that, the quality of the fabricated VO2 in terms of thickness and surface morphology were directly proportional with the molarity of the precursor. As a conclusion, the higher molarities tends to produce thin films with good properties. [ABSTRACT FROM AUTHOR]- Published
- 2018
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