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All Journal International Journal of Electrical and Computer Engineering Bulletin of Electrical Engineering and Informatics Civil Engineering Journal
Saad, Ismail
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering

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A Case Study of S-Curve Analysis: Causes, Effects, Tracing and Monitoring Project Extension of Time Mohamad, Habib Musa; Mohamad, Mohamad Ibrahim; Saad, Ismail; Bolong, Nurmin; Mustazama, J.; Mohd Razali, Siti Nooraiin
Civil Engineering Journal Vol 7, No 4 (2021): April
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/cej-2021-03091679

Abstract

S-Curve analysis in the construction interpreted as managing project with knowledge and traceable in the context of sustainable construction while displays the cumulative costs, labour hours or other quantities plotted against time. In the contract administration, delays in completing a construction project led to the breach of contract but, in contracts itself allow the construction period to be extended where there are delays that are not the contractor's fault. Under those circumstances, a presentation of a case-study regarding the analysis of S-Curve of a life project drew comparative interpretation of project performance towards project delivery schedule has been conducted in private initiative project. This study aims to investigate and examine the factors that cause delays in construction projects from the perspective of S-curve representations. The paper aims to provide in depth light about the existing causes of project delay and describe the key sources of financing problem and identify the consequences of contraventions of contract. Two distinct parts divided which are refers to the methods used to assess the perceptions of clients, consultants, and contractors on the relative importance of causes of delay in a project and referred to the procurement and documentation to analyse the delay. As a result, an Extension of Time (EOT) granted and identically changed the progress towards extension time where better planning demanded for improvement and restoration progress kept on track. This paper presented a practical and comparative S-Curve within extension of time to ensure delivery of project on schedule. In the long run, the identified causes are combined into 16 factors. Finally, the result of this match was brought in order to critically understand and provide a guideline to contractor in preparing EOT application and choose reliable factor based on the specific circumstances of project delay factors thorough review conducted to reveal the nature of EOT application techniques. Doi: 10.28991/cej-2021-03091679 Full Text: PDF
Fault localization on power cables using time delay estimation of partial discharge signals Fern, Chin Kui; Yii, Chai Chang; Bakar, Asfarina Abu; Saad, Ismail; Tze Kin, Kenneth Teo; Ikhsan Megat Hasnan, Megat Muhammad; Mohamad, Nur Aqilah
International Journal of Electrical and Computer Engineering (IJECE) Vol 13, No 6: December 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v13i6.pp6000-6015

Abstract

Precise localization of partial discharge (PD) sources on power cables is vital to prevent power line failures that can lead to significant economic losses for electrical suppliers. This study proposes four methods to estimate the time delay of PD signals under electromagnetic interference, including white Gaussian noise (WGN) and discrete sinusoidal interference (DSI), using denoised PD signals with signal-to-noise ratios ranging from 10.6 to -7.02 dB. The maximum peak detection (MPD) and cross-correlation (CC) approaches, as well as two new techniques, interpolation cross-correlation (ICC) and envelope cross-correlation (ECC), are evaluated for their effectiveness in PD source localization. The researchers employ the time difference of arrival (TDoA) algorithm to compute PD location using the double-end PD location algorithm, where the PD location precision serves as an indicator of the accuracy of the time delay estimation methods. The study concludes that CC and ICC are the most suitable methods for estimating the time delay of PD signals in the PD location algorithm, as they exhibit the lowest error rates. These results suggest that CC and ICC can be used effectively for precise PD source localization under electromagnetic interference on power cables.
Dissipative soliton generation with sidebands using Bismuth Telluride (Bi2Te3) in erbium doped fiber laser Haris, Hazlihan; Awalin, Lilik Jamilatul; Muhammad, Ahmad Razif; Mustaffa, Siti Nasuha; Markom, Arni Munira; Hasnan, Megat Muhammad Ikhsan Megat; Harun, Sulaiman Wadi; Tan, Sin Jin; Saad, Ismail
Bulletin of Electrical Engineering and Informatics Vol 13, No 6: December 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v13i6.8175

Abstract

In this work, the demonstration of dissipative soliton (DS) was observed in erbium doped fiber laser (EDFL) using of Bismuth Telluride (Bi2Te3) nanosheets saturable absorber (SA). The prepared SA was deposited on a fiber ferrule using optical deposition method. Interestingly, the DS generatered was accompanied with sidebands and the number of sidebands grew with laser diode pump power. Sidebands were observed as a result of modulation instability (MI) process, which arises from the interaction between DS and nonlinear gain in the fiber laser cavity. Signal to noise ratio (SNR) of 58 dB was attained, confirming the stability of the generated pulse. This work proved the capability of Bi2Te3 as SA for generating DS with sidebands in an EDFL.
Co-Authors Awalin, Lilik Jamilatul Bakar, Asfarina Abu Bolong, Nurmin Fern, Chin Kui Haris, Hazlihan Harun, Sulaiman Wadi Hasnan, Megat Muhammad Ikhsan Megat Ikhsan Megat Hasnan, Megat Muhammad Markom, Arni Munira Mohamad, Habib Musa Mohamad, Mohamad Ibrahim Mohamad, Nur Aqilah Mohd Razali, Siti Nooraiin Muhammad, Ahmad Razif Mustaffa, Siti Nasuha Mustazama, J. Tan, Sin Jin Tze Kin, Kenneth Teo Yii, Chai Chang