Showing papers by "Norbahiah Misran published in 2020"

An Internet of Things Based Smart Waste Management System Using LoRa and Tensorflow Deep Learning Model

Abstract: Traditional waste management system operates based on daily schedule which is highly inefficient and costly. The existing recycle bin has also proved its ineffectiveness in the public as people do not recycle their waste properly. With the development of Internet of Things (IoT) and Artificial Intelligence (AI), the traditional waste management system can be replaced with smart sensors embedded into the system to perform real time monitoring and allow for better waste management. The aim of this research is to develop a smart waste management system using LoRa communication protocol and TensorFlow based deep learning model. LoRa sends the sensor data and Tensorflow performs real time object detection and classification. The bin consists of several compartments to segregate the waste including metal, plastic, paper, and general waste compartment which are controlled by the servo motors. Object detection and waste classification is done in TensorFlow framework with pre-trained object detection model. This object detection model is trained with images of waste to generate a frozen inference graph used for object detection which is done through a camera connected to the Raspberry Pi 3 Model B+ as the main processing unit. Ultrasonic sensor is embedded into each waste compartment to monitor the filling level of the waste. GPS module is integrated to monitor the location and real time of the bin. LoRa communication protocol is used to transmit data about the location, real time and filling level of the bin. RFID module is embedded for the purpose of waste management personnel identification.

A Gap Coupled Hexagonal Split Ring Resonator Based Metamaterial for S-Band and X-Band Microwave Applications

Abstract: A gap coupled hexagonal split ring resonator (GCHSRR) based metamaterial is presented in this paper for S-band and X-band microwave applications with absorptance. This gap coupled hexagonal split ring resonator is the amendment of the typical split-ring resonator (SRR). Three interconnected hexagonal split ring resonators are applied with a stripline to increase the electrical length and coupling effect of the GCHSRR. SRR has an impact on the extraction of effective parameters such as permittivity, permeability and refractive index. The dimension of the proposed GCHSRR unit cell is $10\times 10$ mm 2, which is printed on low-cost FR4 material. The transmission frequency of the proposed GCHSRR unit cell ranges from 3.42 GHz to 3.73 GHz and 11.27 GHz to 11.91 GHz, which makes the metamaterial applicable for S-band and X-band microwave applications. The GCHSRR unit cell has a double negative regime of 7.92 GHz to 9.78 GHz with an effective negative refractive index regime of 6.30 GHz to 10.22 GHz and 11.97 GHz to 12.61 GHz. The effective medium ratio is 8.4, which implies the novelty of the proposed design. Moreover, the GCHSRR has high absorption peaks of 99%, 98%, and 81% at 4.27 GHz, 5.42 GHz, and 12.40 GHz, respectively. An $18\times 20$ GCHSRR array structure is also designed and studied. The effective parameters and the effective medium ratio with a high absorptance make the proposed GCHSRR based metamaterial suitable for practical microwave applications.

A tri-band left-handed meta-atom enabled designed with high effective medium ratio for microwave based applications

Abstract: This paper represents a tri-band left-handed meta-atom with high effective medium ratio, which is applicable for tri-band microwave based communication applications. The proposed meta-atom consists of modified complementary split ring resonator (CSRR) with two pi shaped metal strip loaded in the inner side. It shows the behavior of negative permeability and permittivity at 2.85 GHz, 4.83 GHz, 8.39 GHz, and 11.42 GHz resonance frequencies and extracted the double negative (DNG) metamaterial properties. The designed meta-atom dimension is 0.076 λ × 0.076 λ at lower resonance frequency. To develop and analyze the offered meta-atom, the electromagnetic (EM) simulator CST Microwave Studio and MATLAB software were used. The equivalent circuit with RLC components of the proposed metamaterial unit cell is also investigated through ADS simulator and comparing S parameter (transmission coefficients) results with CST results. Analysis and comparison have been carried out with different configurations, such as various design structures, distinct substrate, changing the gap of the splits, and various array measures. All the array configurations proved that the frequency of operation is in the S-, C-, and X-bands. The designed meta-atom has double negative regions of 2.89–2.96 GHz, 4.84–4.99 GHz, 8.42–8.49 GHz, and 11.43–12.32 GHz, with the regions of effective negative refractive index 2.85–3.09 GHz, 4.83–5.36 GHz, 8.40–8.57 GHz, and 11.40–12.55 GHz, respectively. The effective medium ratio is 13.16; this implies that the proposed miniaturized meta-atom design is efficient and compact. The scattering parameter dimension of the meta-atom promising for the microwave based applications at S-, C-, and X-bands.

Coupled ring split ring resonator (CR-SRR) based epsilon negative metamaterial for multiband wireless communications with high effective medium ratio

Abstract: In this paper, coupled ring split-ring resonator (CR-SRR) based epsilon negative (ENG) metamaterial with high effective medium ratio (EMR) is designed and investigated for microwave applications. The metamaterial unit cell is a modification of the conventional split-ring resonator, which consists of three major outer split rings with two face to face horizontal E segments placed at the center. All the rings are intercoupled with each other to increase the electrical length. The coupling effect is clearly observable as it provides multi-frequency resonances and a higher value of the effective medium ratio. The electrical length of the proposed unit cell is 0.064λ × 0.064λ, where λ is the wavelength calculated at the lowest resonance frequency (2.24 GHz). The designed unit cell is fabricated on a FR-4 substrate, having a thickness of 1.5 mm. Negative permittivity is observed at frequencies ranging from 2.15 to 2.3 GHz, 4.4–4.95 GHz, 5.7–6.1 GHz, 8.46–9.2 GHz, and 10.6–10.98 GHz. It also exhibits near-zero refractive indexes in the vicinity of these frequency ranges. The equivalent circuit is also designed for the proposed unit cell. The values of the lumped components are optimized by using Advanced Design Software (ADS). This circuit also demonstrates similar multi-band resonances. A high effective medium ratio (EMR) of 16.74 at 2.24 GHz indicates the compactness of the proposed unit cell. Array performance is also investigated by using 1 × 2, 2 × 2, and 16 × 16 array of unit cells. Multiband resonances of the transmission coefficient, |S21| are also noticed from these arrays. For high EMR and small size, the proposed metamaterial is suitable for S, C, and X-bands applications in wireless communications.

Wideband 8×8 patch antenna array for 5G wireless communications

Abstract: This paper presents a broadband cross-shaped patch antenna with an elliptical slotted ground plan as single unit for coming 5G wireless communication networks. The proposed single antenna has resonating wideband frequencies from 22 to 45 GHz, which cover 28 GHz and 38 GHz operating frequency. The radiation efficiency of the single unit antenna is 92% at 28 GHz and 90% at 38 GHz. The measured return loss of at 28 GHz is -17.66 dB with maximum gain of 3.81dBi while return loss of 38 GHz is -13.24 dB with maximum gain of 4.86dB. The antenna is designed on low loss Rogers’s 5880 substrates with dielectric constant 2.2 and dielectric loss of 0.009. The antenna has compact dimension of 0.392λ0 × …

Risiko Gangguan Seksual di dalam Rumah kepada Remaja: The Risk of Sexual Harassment in House to Teenagers

Abstract: Sexual harassment is a sexually oriented act committed against another person either verbally, non-verbally, physically, or emotionally. Sexual harassment can occur to female teenagers whether they are inside or outside home. This quantitative study used questionnaires that were analysed using SPSS 2.0. The objective of the study is to explore the extent of domestic sexual harassment risk on female teenagers while they are at home. A total of 84 girls from the age of nine to fifteen in Selangor participated in this study where they have received consent from their parents and guardians to participate in this study. This study found that 7.14% of the participants admitted that they like to wear sexy clothes at home and had watched pornographic videos with close family members such as father, brother, uncle, and grandfather. The findings revealed that they had experienced sexual harassment by their family members if they do not maintain the Islamic manners in addition to being excessively exposed to the unlimited information technology facility. The findings also showed that there are unsafe elements towards female teenagers at home if the family well-being mechanism is not properly and well maintained. The implications of this study suggested a development of a mobile application to identify the initial signs of sexual harassment towards female teenagers. ABSTRAK Gangguan seksual merupakan perlakuan berbaur seks yang dilakukan terhadap individu lain sama ada berbentuk lisan, bukan lisan, fizikal atau emosi. Gangguan seksual boleh berlaku kepada remaja perempuan ketika mereka berada di dalam atau di luar rumah. Metodologi kajian menggunakan kaedah tinjauan yang melibatkan kajian kuantitatif dan dianalisis menggunakan perisian statistik SPSS 2.0. Objektif kajian adalah untuk meneroka sejauh mana risiko gangguan seksual berlaku kepada remaja perempuan sewaktu di dalam rumah. Seramai 84 orang remaja perempuan yang berusia sembilan hingga 15 tahun di negeri Selangor telah mendapat kebenaran daripada ibu bapa dan penjaga masing-masing untuk menjadi peserta kajian. Kajian mendapati seramai 7.14% remaja perempuan mengakui suka berpakaian seksi di rumah dan pernah menonton video pornografi bersama ahli keluarga terdekat seperti bapa, abang, bapa saudara serta datuk. Dapatan juga menunjukkan mereka mengalami gangguan seksual dalam kalangan ahli keluarga sekiranya mereka tidak menjaga adab-adab Islam disamping banyak terdedah dengan kemudahan teknologi maklumat yang tiada batasan. Dapatan juga menunjukkan wujudnya elemen yang tidak selamat kepada anak-anak remaja perempuan yang berada dalam rumah sekiranya mekanisme kesejahteraan keluarga tidak dipelihara dengan baik dan betul. Implikasi kajian ini mencadangkan pembangunan sebuah aplikasi mudah alih bagi mengenalpasti tanda-tanda awal gangguan seksual yang berlaku kepada remaja perempuan.

Study and Implementation Frequency Reconfigurable of Dielectric Resonator Antenna Using Ground Feed Switch for S Band Applications

Abstract: A rectangular Dielectric Resonator Antenna (DRA) feeds by two microstrip taper with one is presented, one feed has grounded switch. This switch can control the frequency band. The step by step for the rectangular dielectric resonator antenna design is carried out. The overall antenna size is 30×40×11.635 mm. The proposed antenna achieves the goal of obtaining frequency reconfigurable. The – 10 impedance frequency range when switching off is from 2.705 to 3.02 GHz while switch on is from 3.09 to 3.3 GHz. In additional the proposed antennas have good radiation efficiency above 90%. The proposed antenna is suitable for Indoor Access point S-Band Applications.

Automated QT Interval Measurement Using Modified Pan-Tompkins Algorithm with Independent Isoelectric Line Approach

Abstract: The QT interval on the electrocardiogram (ECG) signal is known to have an important role in monitoring heart’s electrical activity because the presence of QT interval prolongation can be associated with life-threatening cardiac events. This interval can be identified and measured using either manual or automated techniques. Currently, studies on automated QT interval measurement algorithms are becoming a growing field, as they can provide the best solution to overcome misdiagnosis and timely issues resulting from manual identification. However, the physiological variability of the QRS complex and the fluctuation of the isoelectric line are prevalent issues that need to be considered in the automatic method. In this report, an algorithm to identify the QRS onset and T-wave offset for measuring the corrected QT interval (QTc) is proposed. This method uses an improved Pan-Tompkins algorithm from the previous work with independent of the isoelectric line approach for detecting the QRS onset and the T offset. The algorithm was implemented in Matlab and applied to the 60 seconds duration of 27 records in the PPUKM database with a sampling frequency of 500 Hz. The performance of the algorithm achieved a sensitivity of 100% for QRS onset detection and 100% for T offset detection. As for the accuracy, the algorithm’s performance obtained 100% for QRS onset detection and 99.56% for T offset detection. The mean error results with respect to manual annotation were 37±18.5 ms for QRS onset detection and 32±22.3 ms for T offset detection which was within ANSI/AAMI-EC57:1998 standard tolerance. The proposed algorithm exhibits reliable automated QTc measurement. Besides insensitive to morphological variations of ECG waves, the computational method is simple and possibly implemented as the basis for future software development for portable device applications.