45 research outputs found
Modelling and control of flexible structure for satellite attitude maneuvers using pole placement and PID controller
No full textAccess is limited to UniMAP community.This thesis describes the studies on vibration of flexible structure of satellite
(solar panel) by using cantilever beam for performance analysis. Nearly ideal
cantilever beam model is studied to provide basic understanding in vibration
solar panel of satellite operation, follow by a mathematical model of cantilever
beam, containing relationships for vibration reaction, angular momentum, power
consumption and disturbances. From the cantilever model with consist of
parameters to studies about response on vibration. To solve this problem,
MATLAB/SIMULINK is used to obtain the transfer function of the cantilever
beam modeling. From simulation results shows a transfer function modeling
providing the slow time response. For this case, fast response controller design
was implemented in this modeling. Pole Placement controller and PID controller
are designed and compared the performance on the modeling system by using
MATLAB/SIMULINK. Simulation results show PID adding Pole Placement
controller gives better performance in term of rise time, settling time, percentage
overshoot, steady state error and performance indices than Pole Placement
controller
Embedded prayer time system using GPS module
No full textThis final year project is about to calculate of prayer time system in microcontroller using the spatial data retrieve from satellite via Global Positioning System (GPS) receiver module. This system is able to determine the position of latitude and longitude of the earth. For this project, a complete set of DS89C450 microcontroller board is developed. The microcontroller work to calculate the five prayer time Fajr, Zuhr, Asr, Maghrib and Isha. The calculation is performed using C language programming. Then it is need to embed into the DS89C450 microcontroller. The microcontroller board will be connected to the GPS Receiver Module to get the latitude and longitude as the input data. Then the microcontroller calculates the prayer time and the result will be displayed through Liquid Crystal Display (LCD). The aim of this project is to make sure the prayer time will be displayed via Liquid Crystal Display and it will occur automatically without any manually load position into the microcontroller
User's hand effect on efficiency of 2-port 5 GHZ mobile terminal antennas
No full textIn this paper, the influence of user’s hand on mobile terminal antenna when it placed approximately on top of Multiple Input Multiple Output radiating element antennas (PIFAs) is studied extensively. The antenna is designed to operate at 5 GHz with 1.5 GHz of -6 dB bandwidth. The effect of user’s hand with different finger positions are studied at seven positions on slit at the ground plane, seven differences height above the antenna and nine different locations around the radiating element at 2 mm height from antenna. The losses due to presence of hand are studied in terms of scattering parameters, radiation efficiency and matching efficiency. The maximum loss in term of isolation in the presence of user’s hand is found at 6 mm on the slit and it decreased as the hand move away from the slitted area on the ground plane. The maximum efficiency loss is observed when the finger is placed right on top of the radiating element with -5.85 dB compare to antenna without the presence of user’s hand. On the other hand, the result for matching efficiency indicates approximately 0.2 dB losses occurred when the fingers are varied at different height and position
Psychosocial constraints experienced by caregivers of children with special needs in Kelantan, Malaysia/ Siti Nor Ismalina Isa ... [et al.]
No full textFamilies of children with special needs (CWSN) experience many difficulties and are socioeconomically disadvantaged when compared to families of typical children. The burden of care, social, financial and other stressful situations are considered to be crucial in determining the quality of life (QoL) of the families of CWSN. The purpose of this study was to explore the psychosocial constraints faced by caregivers of CWSN in Kelantan, Malaysia which affected their QoL. A qualitative study was conducted utilizing the phenomenology approach. A total of 22 participants were recruited for face-to-face, in-depth interviews. The sample was comprised of caregivers (n = 14), community-based rehabilitation trainers (n = 4), special education teachers (n = 3), and welfare officer (n = 1). Each interview was recorded on audio-tape. The recordings were transcribed and thematic content analysis was used to create codes and identify emerging themes. It was found that psychosocial constraints experienced by the caregivers were associated with common themes such as psychological factors, accessibility to services, socio cultural issues, social supports, and system and policy. Thus, intervention strategies to improve the QoL of caregivers of CWSN should target the family unit and consider the psychosocial factors of the caregivers
Design of Four-Port Antenna for Human Activity Recognition in Ambient Backscatter Communications Systems at 433 MHz
No full textAbstract
This paper presents a novel design for a four-port transmitter antenna circuit tailored for an ambient backscatter communication system (ABCS) operating at 433 MHz, aimed at enhancing human activity recognition (HAR) in healthcare monitoring applications. The proposed system captures the ability of the ABCS to utilize ambient radio frequency (RF) signals, such as those from Wi-Fi, to transmit data without the need for active RF sources. This feature is particularly advantageous in low-power, data-intensive environments. The paper introduces the development of the ABCS framework, comprising a four-port antenna circuit and a Nooelec NESDR Mini USB RTL-SDR receiver, to accurately detect eight specific human activities, including new healthcare monitoring activities like “standing while dizzy,” “standing and suddenly collapsing,” and “sitting while shaking.” The experiment was conducted with five participants performing eight activities, and the results demonstrated distinct signal patterns corresponding to each activity. The findings show that the proposed system is a promising solution for the real-time, non-intrusive monitoring of human activities, which is crucial for early detection and intervention in healthcare scenarios.Abstract
This paper presents a novel design for a four-port transmitter antenna circuit tailored for an ambient backscatter communication system (ABCS) operating at 433 MHz, aimed at enhancing human activity recognition (HAR) in healthcare monitoring applications. The proposed system captures the ability of the ABCS to utilize ambient radio frequency (RF) signals, such as those from Wi-Fi, to transmit data without the need for active RF sources. This feature is particularly advantageous in low-power, data-intensive environments. The paper introduces the development of the ABCS framework, comprising a four-port antenna circuit and a Nooelec NESDR Mini USB RTL-SDR receiver, to accurately detect eight specific human activities, including new healthcare monitoring activities like “standing while dizzy,” “standing and suddenly collapsing,” and “sitting while shaking.” The experiment was conducted with five participants performing eight activities, and the results demonstrated distinct signal patterns corresponding to each activity. The findings show that the proposed system is a promising solution for the real-time, non-intrusive monitoring of human activities, which is crucial for early detection and intervention in healthcare scenarios
SNR-based Dynamic Sequence Distance Vector routing protocol metric for mobile ad-hoc networks
No full textSNR-based dynamic sequence distance vector routing protocol metric for mobile ad-hoc networks
No full textLink to publisher's homepage at http://ieeexplore.ieee.org/Mobile ad hoc networks (MANETs) are consists of mobile devices connected wirelessly. Mobile nodes in MANET are applicable of routing functionality, where messages are forwarded in a multi-hop fashion. In such a communication scheme a routing protocol play an important role in the network performances. The wireless connectivity and node mobility in MANET networks contributes in rapid topological changes, which brings the need for a channel aware routing protocol. To overcome this problem, many channel aware routing metrics are proposed in the literature, however these routing metrics are either utilizing the shared bandwidth to measure the link quality, or they implies less awareness to the link quality. This paper proposed a SNR-based routing metric for Dynamic Sequence Distance Vector (DSDV) routing protocol. This paper starts by investigate and compare the performance among common routing protocols in MANET. Secondly a cross layer approach is proposed for the new routing metric. Simulation scenarios are used for the work of the paper. The new metrics is implemented in one of the MANET common routing protocols DSDV module in MONET++. The results show that SNR-based DSVD improves the performance of the MANET in terms of throughput and delay
Weighted signal-to-noise ratio average routing metric for dynamic sequence distance vector routing protocol in mobile ad-hoc networks
No full textLink to publisher's homepage at http://ieeexplore.ieee.org/It is clearly that mobile ad-hoc networks (MANET) gained the interest of research and market place lastly, and that is due to its wide variety of applications. However, nodes mobility implies rapid topology changes, where a channel aware routing protocol is becoming a necessity to cope with this problem. Many channel aware routing metrics are proposed in the literature, however these routing metrics are either utilizing the shared bandwidth to measure the link quality, or they implies less awareness to the link quality. This paper proposed a cross layer collaboration routing metric "Weighted Signal to noise ratio average (WSA)" and its implementation on the Dynamic Sequence Distance Vector (DSDV) routing protocol. The WSA metrics utilizes the SNR information provided by the physical layer to weight the quality of the link, and requires no additional traffic on the shared bandwidth. The new metrics is implemented in one of the MANET common routing protocols DSDV. Simulation Scenarios are implemented to study and to compare the performance of WSA. The results show that WSA improves the performance of the MANET in terms of throughput and delay
Weighted Signal-to-noise ratio average routing metric for Dynamic Sequence Distance Vector routing protocol in mobile ad-hoc networks
No full text
