Waiter, which is an applicant for telephone service is registered as a waiter when service cannot be provided owing to shortage of facilities. Waiters tracking are one of the vital elements in processes of Telekom Malaysia. The existing system, namely CASS (Customer Automated Service System) provides some tools for clearing waiters in the form of waiter reports and congested cable route report. However, these reports are managed manually, are not effective to fulfill the Telekom Malaysia mission and vision.
This project aims to deliver an efficient and effective system to replace the manual way of clearing waiters. This web-enabled system namely Waiters Tracking System should
definitely assist the state zone to clear waiters. The software development methodology used to develop this prototype is the Rational Unified Process (RUP) approach. This prototype was evaluated using User Interface Satisfaction Questionnaire to discover its functionality and usefulness. The results of the project development and project evaluation, and contribution of knowledge are described at the end of paper.
Summary This paper presents the results of beacon measurements on a moderate elevation satellite link at 12.255 GHz during the present of scintillation were analyzed. The spectra of the beacon signal were extracted from the raw beacon data using high pass filter with suitable cutoff frequency where the scintillation here are characterized by standard deviation of the amplitude fluctuations and by the distribution of amplitude deviations from their mean. The mean of the power spectra that’s been displayed by two asymptotic with the values was found to be close to the slope of the Kolmogorov spectra.
This paper presents a novel design of a harmonic suppression single-fed dual-circularly polarized microstrip patch antenna for a rectenna system in the future wireless power transmission application. The proposed antenna is capable of receiving both types of circular polarization signal; RHCP and LHCP simultaneously and at the same time it also able to filter the unwanted harmonic signals itself. These characteristics are achieved after introducing a circular slot defected ground structure to an array of nearly-square microstrip patch antenna with an offset inset microstrip feeding line and two open stubs on the feeding line. The proposed antenna is very simple on the single substrate only and this led to a reduction of errors that occurs during the fabrication process. However, the most importantly is the possibility of the polarization mismatch during transmission of signal can be minimized and the use of additional harmonic filter circuit can be eliminated. Thus the rectenna system becomes smaller, cheaper, less complexity and more efficient. The overall structure of the proposed antenna is designed on the top surface of the PCB only, thus it can be interfaced with other circuit such as rectifier or other circuit easily. The Computer Simulation Technology (CST) has been used in the simulation and optimization of the design. Finally, for the verification of the design, the prototype of the proposed antenna is fabricated and measured. From the simulation and measurement results, the proposed antenna can be a good choice in the rectenna system for future wireless power transmission application. Keyword Harmonic suppression, microstrip patch antenna, circularly polarized, dual-circularly, wireless power transmission, rectenna system
This paper is to present the harmonic phenomenon. The Fourier series is the tool for harmonic analysis in order to interpret waveforms behavior due to nonlinear loads is carried out. Some harmonics measurements for nonlinear loads are also observed. The harmonics theory, definition of harmonic quantities, related harmonics problems in power distribution systems are explained. Also, filter applications such as passive filter in overcoming harmonic problems are discussed. This paper also investigate the recent developments for active power filter uses power electronic switching to generate harmonic currents that cancel the harmonic currents from a nonlinear load is then described.
Although the gains of V-antennas are good, the antennas are too large. In order to reduce the size of the antenna, the effects of introducing magnetic material in the antenna's arm are studied. This entails the derivation of a radiation pattern expression and field strength measurements for V-antennas with and without magnetic material. Both the calculated and measured results are analyzed and found to be in good agreement. It is concluded, therefore, that the magnetic material can affect the radiation pattern and hence can be used as a design parameter in reducing and controlling the antenna size.< >
In this paper, the study of shell and body tissue simulating liquid (BTSL) thickness and its effects on capsule antenna performance at 2.45 GHz were presented. Two simulation setups which consists two different sets of shell and BTSL position near the capsule antenna were used in the simulation process. The reflection coefficient, directivity, gain and efficiency performance in those simulation setups were determined and compared. The influence of human tissue thickness on the antenna behavior must be considered.
††† Summary This paper presents the result of measurement studies of amplitude scintillation on moderate-elevation satellite path at Ku-band. The prediction models for tropospheric scintillation on earth satellite paths from ITU and Gaussian are compared with measurement results from USM, Parit Buntar at frequency of 12.255 GHz and elevation angle of 40.1 0 . The scintillation is here characterized by standard deviation of amplitude fluctuation and by the distribution of amplitude deviation from their mean. The ITU prediction model relates the average scintillation intensity to the wet term of refractivity at ground level.
This paper presents the results for the performance of passive and active power filter to reduce harmonics in the distribution system. The harmonics analysis is performed in order to observe the percentage reduction of amplitude current harmonics and total harmonic distortion for passive and active power filter at various loads. In addition to that the bidirectional switching is used as a strategy control in active power filter. Representative result of circuit simulations is carried out. The results show that the active power filter can simultaneously attenuate various frequencies and are compared with passive filter which is only filtering an individual harmonics. Also, the significant percentage of reduction for the amplitude current harmonics and total harmonic distortion by active power filter are compared to passive filter. Furthermore, the sinusoidal current waveform quality at distribution lines which filtered by active power filter is better compared with passive filter. Therefore, the active power filter is good to reduce harmonics in the electrical distribution systems.
The full-wave-dipole antenna is very seldom used in communication systems, and yet this type of antenna offers a very high gain. This is due to the high input impedance for the center-tap feeding-point antenna. The analysis of short-length and half-wavelength dipole antennas has been reported, in great detail previously, in texts. However, an analysis of the full-wave dipole antenna has not been detailed nor reported, either in texts or journals. Such an analysis is very significant, in order to understand more about this antenna's properties and potential applications for exploiting its high-gain benefits. The paper presents an analysis of the radiation resistance and gain of the full-wave-dipole antenna. This involves special integrations in the mathematics.< >
'/%3e%3cuse xlink:href='%23a' transform='translate(0 -400)'/%3e%3cuse xlink:href='%23a' transform='translate(0 -600)'/%3e%3cuse xlink:href='%23a' transform='translate(0 -800)'/%3e%3cuse xlink:href='%23a' transform='translate(0 -1000)'/%3e%3cuse xlink:href='%23a' transform='translate(0 -1200)'/%3e%3cpath d='M0 0h1400v800H0z' style='fill:%23010066'/%3e%3cpath d='M576 100c-166.146 0-301 134.406-301 300s134.854 300 301 300c60.027 0 115.955-17.564 162.927-47.783-27.353 9.44-56.71 14.602-87.271 14.602-147.327 0-266.897-119.172-266.897-266.01 0-146.837 119.57-266.01 266.897-266.01 32.558 0 63.746 5.815 92.602 16.468C696.217 118.91 638.305 100 576 100z' style='fill:%23fc0'/%3e%3cpath d='m914.286 471.429-99.538-53.25 29.43 108.982-66.575-91.165-20.77 110.96-20.428-111.024-66.857 90.96L699.314 418l-99.701 52.943 74.065-85.192-112.8 4.441 103.694-44.62-103.555-44.94L673.8 305.42 600 220l99.538 53.25-29.43-108.982 66.575 91.165 20.77-110.96 20.428 111.023 66.857-90.959L814.97 273.43l99.702-52.944-74.065 85.193 112.8-4.441-103.694 44.62 103.555 44.94-112.785-4.79z' style='fill:%23fc0' transform='matrix(1.2738 0 0 1.2423 -89.443 -29.478)'/%3e%3c/svg%3e)
