Naimah Mat Isa

Performance analysis of transparent and non-transparent relays in MMR WiMAX networks

The main function of relay station is to enhance the network capacity and extend the coverage area. This paper analyses the performance of relay stations in IEEE 802.16j Mobile Multi-hop Relay (MMR) WiMAX for the transparent and non-transparent modes. The performance of these relays is evaluated based on the throughput for the downlink and uplink transmission using National Chiao Tung University - network simulator (NCTU-ns) module. This study shows that the sustained rate for uplink transmission is 0.471 Mbps while for the downlink in the relay mode is about ten times higher either for transparent or non-transparent relay types.

Orchid disease detection using image processing and fuzzy logic

This paper presents an orchid disease detection system using image processing and fuzzy logic. The main objective of this paper is to design a system that is able to detect an orchid disease by processing its leaf image. The system consists of two parts, image processing and fuzzy logic. The leaf image processing uses methods like grayscaling, threshold segmentation and noise removing. The data collected from the image processing are the centroid, area and number of diseased spot. These data or numbers is then fed through the fuzzy logic system to be processed through fuzzification, fuzzy inference and defuzzification in order to get the output. The result shows that the orchid disease can be detected by using image processing and fuzzy logic.

Efficient network coverage for wireless sensor networks

Wireless sensor networks have a wide range of applications including environmental monitoring, habitat monitoring and disaster recovery. Since sensor nodes are deployed in a large land region, the objective is to achieve complete coverage of the region. It is crucial to develop a sufficient transmission signal between the node in the region or cell to the leader node or in base station. In previous research, network coverage is the main issue in WSN. This study presents an approach for the design of wireless sensor network under the deployment of hexagonal shaped cell with sectorized antenna. The proposed approach should be regarded as part of any feasibility study during the planning stages for the deployment of a wireless sensor network, when decisions about its efficient network coverage and cost are considered. The main objective of this project is to improve the communication coverage in the network. By improving the coverage problem, it will also reduce the number of sensor nodes deployed, hence reducing the cost.

Modeling the Concentric Fiber Optic Bundle Displacement Sensor Using a Quasi-Gaussian Beam Approach

In the design and analysis of a fiber optic displacement sensor, modeling of the modulation function is important as it leads to accurate descriptions of several important parameters that are to be taken into consideration of the sensor design. Furthermore, it is also important for the experimental verification. Here, the design of a reflective-based intensity modulation mechanism for displacement measurements, employing a concentric fiber optic bundle acting as the fiber optic probe, with a planar reflector is presented. The aim is to develop a new theoretical model for analyzing the modulation function of the sensor using a quasi-Gaussian approach. In the case of fiber optic bundles, the choice of the emitted beam shape becomes more critical as there will occur partial illumination of the receiving cores for smaller values of displacements. In an attempt to produce a more accurate model for the modulation function, a slightly different angular dependence as presented in the quasi-Gaussian approach is more suitable. Perturbation parameters are used to indicate the variation amount of the actual beam profile from the Gaussian profile. The derivation of the mathematical model developed for describing the characteristics of such sensing mechanisms is demonstrated. The model is subsequently verified using the simulation of the quasi-Gaussian beam approach and validated using the experimental data. A comparison with the simulation of the widely used Gaussian beam approach is made. The quasi-Gaussian approach is proven to be a much better approximation than the Gaussian approach.

Pharmaceutical product information based on Android platform

Counterfeit medicine is a serious issue since it involves with the health of human. Objective of this work is to design a mobile application system for checking status of medicine approval by Malaysia Ministry of Health. This application is developed using Android based system. Before the products either traditional medicine or modern medicine are being distributed in the market, they should be registered with Malaysia Ministry of Health in order to ensure the customers safety. The registration is needed to approve that the medicine is safe to be used. Methods that had commonly been used to identify the medicine are through website, barcode scanner, quick response (QR) code scanner and hologram scanner. However, in this project, the proposed method is text-search on Android platform. This system is expected to identify the status of pharmaceutical products, whether the medicine is counterfeit or not by using search query. Besides showing the status of the medicine, it also includes some other information such as products name, holder, manufacturer and the dangerous substances contain in the medicine. All the information is stored in the mobile database.

Teaching the Intel 8051 Microcontroller with hands-on hardware experiments

The Centre in Computer Engineering Studies at Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM) has developed and built the Intel 8051 Trainer and Application Board that is used by the students at the faculty as a learning tool. This microcontroller is taught in the Microprocessor System course and is available in the Software Application Laboratory. This paper presents the major components of the laboratory exercises and describes each component used as hands-on experiments for teaching 8051 Intel Microcontroller System. Sample of students output of hands-on experiment is also illustrated.