Conference Paper

Performance Evaluation of Route Selection Schemes Over a Clustered Cognitive Radio Network

150 150 MIMOS Berhad

Authors:

Mariam Musavi, Kok LIm Alvin, Hafizal Mohamad & Nordin Ramli

 

Abstract:

Cognitive radio (CR) is a promising next-generationwireless communication system that provides efficient utilizationof radio spectrum by enabling unlicensed users (or secondaryusers, SUs) to sense for and use underutilized radio spectrum(or white spaces) owned by licensed users (or primary users,PUs). In this paper, we investigate the effects of a larger networksize (or higher number of routes) on non-clustered, clusteredand clustered-reinforcement learning (RL)-based route selectionschemes in a USRP/ GNU radio platform focusing on thenetwork layer. Experimental results show that the enhancedvariant of reinforcement learning (RL)-based route selectionscheme (C-ERL) selects stable route(s) over a clustered CRN in aUSRP/ GNU radio platform. C-ERL improves cluster stability byreducing the number of route breakages caused by route switches,and network scalability by reducing the number of clusters inthe network without significant deterioration of QoS, includingthroughput, packet delivery rate, and end-to-end delay

 

Source:

16th IEEE Asia Pacific Wireless Communication Symposium (APWCS 2019), Singapore

Modeling of Dirac Voltage for Highly P-Doped Graphene Field Effect-Transistor Measured at Atmospheric Pressure

150 150 MIMOS Berhad

Authors:

Muhamad Amri Ismail; Khairil Mazwan Mohd Zaini; and Dr. Mohd Ismahadi Syono

 

Abstract:

In this paper, the modeling approach of Dirac voltage extraction from highly p-doped graphene field-effect transistor (GFET) measured at atmospheric pressure is presented. The difference of measurement results between atmospheric and vacuum pressures was analyzed. This work was started with actual wafer-scale fabrication of GFET with the purposes of getting functional device and good contact of metal/graphene interface. The output and transfer characteristic curves were measured accordingly to support on GFET functionality and suitability of presented wafer fabrication flow. The Dirac voltage was derived based on the measured output characteristic curve using ambipolar virtual source model parameter extraction methodology. The circuit-level simulation using frequency doubler circuit shows the important of accurate Dirac voltage value to the device practicality towards design integration.

 

Source:

4th International Conference on Electrical, Electronic, Communication and Control Engineering (ICEECC), UTM, Skudai, Johor

Atomization of Reduced Graphene Oxide Ultra-thin Film for Transparent Electrode Coating

150 150 MIMOS Berhad

Authors:

Mohd Rofei Mat Hussin; Siti Aishah Mohamad Badaruddin; Mohd Hilmy Azuan Hamzah; Nik Mohd Razali Mohd Nor; Yuan Piou Choong; Hin Yong Wong; Asm Mukter-Uz-Zaman

 

Abstract:

In this research, an atomization process was introduced to deposit carbon-based nanomaterials i.e. graphene oxide (GO) on 200 mm silicon wafer for high volume production of a transparent conductive electrode (TCE). An ultrasonic spray coating process was used to deposit a stable dispersion of graphene oxide in ethanol on silicon and glass substrates. The thickness of the thin films can be controlled within a nanometer-scale with the high uniformity coating process. Functionalization of GO based on thermal reduction in Rapid Thermal Process (RTP) and Plasma Enhanced Chemical Vapour Deposition (PECVD) chambers was performed to make the GO electrically conductive and optically transparent. AFM measurements revealed that the thin film thickness has a strong correlation with the number of spray passes that can be translated into spray volume. It was discovered that the thin films demonstrate a good electrical conductivity with high optical transparency in the visible light. The sheet resistance of the films can be significantly reduced by rapid thermal annealing at a high temperature of up to 1100 °C and reach 5.3 kΩ/sq with a light transmittance of 77.1% at 550 nm wavelength. This is a low-cost solution for high volume production of TCE, which have a high potential for scaling-up.

 

Source:

Conference on Sustainable Utilization and Development in Engineering and Technologies (CSUDET), Penang

Validation of Early Testing Method for E- Government Projects by Requirement Engineering

150 150 MIMOS Berhad

Authors:

Ashok Sivaji, Azlan Deneil, Anjana Devi N Kuppusamy, Aslinda Md Hashim, Fazil Zainal Abidin, Norzamzarini Mohd Bajuri, Nurshakirin Sazali, Afiqah Musa, Mohd Solehudin Abdullah, Ngip Khean Chuan and Nadia Ellyani Azis

 

Abstract:

e-Government System and Software projects are costly. The success of projects has high impact to the level of effectiveness of service delivered by government to citizens. However, poorly managed system and software requirements by project team could lead to project failures. Therefore, validation of requirements at early stages is important. The objective of this paper is to validate the Early Requirement Testing Method for e-Governmentprojects.A ‘Wilcoxon Matched Pairs Signed-Rank Test’ was used, whereby test engineers were subjected to performing Early Requirement Testing Method across six(6)e-Governmentprojects before and after an intervention has been introduced to the e-Governmentemployees and the project team (Business Analyst/Requirement Engineer). Results revealedthat the null hypothesis of “no statistically significant differences between employing the method in e-Governmentprojects”can be rejected and therefore conclude that method reported was useful in reducing the requirement related defects, as the difference is negative (reduction of defects) Z= -2.892, p=0.004.

 

Source:

IEEE Conference on Open Systems (ICOS 2019) Pulau Pinang

Unified Theory of Acceptance and Use of Technology of E-Government Services in Malaysia – Validation of Survey Instrument

150 150 MIMOS Berhad

Authors:

Ashok Sivaji, Siti Hamimah Rasidi, Saiful Hizam Hashim, Anjana Devi N Kuppusamy, Fazil Zainal Abidin, Ngip Khean Chuan, Afiqah Musa, Nursahirin Sazali, Azlan Deneil, and Shi Tzuaan Soo

 

Abstract:

Although Malaysia has achieved high Online Service Index ranking in the 2018 United Nations EGovernment survey, there are still areas for improvements in providing citizen centric services. The objective of this study is develop and validate a survey instrument to understand further the level of technology acceptance of the MYGOVSVC System among Malaysian government employees, which could steer improvements in eGovernment services for the citizens. A mixed method approach of literature analysis of unified theory of acceptance and use of technology and survey as data collection method is used. Results confirmed the acceptance and readiness of government employees in providing these services. Furthermore, the validated bilingual survey instruments (21 items) which is a main contribution of this study could be used in the future for other eGovernment services and thus helping the government to deploy electronic system that are beneficial, easy to use, satisfying and reliable to the nation.

 

Source:

IEEE Conference on Open Systems (ICOS 2019) Pulau Pinang

Special article: Issue #3