Chance-constrained Scheduling of Variable Generation and Energy Storage in a Multi-Timescale Framework

Wen-Shan Tan,Md Pauzi Abdullah,Mohamed Shaaban 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.5

This paper presents a hybrid stochastic deterministic multi-timescale scheduling (SDMS) approach for generation scheduling of a power grid. SDMS considers flexible resource options including conventional generation flexibility in a chance-constrained day-ahead scheduling optimization (DASO). The prime objective of the DASO is the minimization of the daily production cost in power systems with high penetration scenarios of variable generation. Furthermore, energy storage is scheduled in an hourly-ahead deterministic real-time scheduling optimization (RTSO). DASO simulation results are used as the base starting-point values in the hour-ahead online rolling RTSO with a 15-minute time interval. RTSO considers energy storage as another source of grid flexibility, to balance out the deviation between predicted and actual net load demand values. Numerical simulations, on the IEEE RTS test system with high wind penetration levels, indicate the effectiveness of the proposed SDMS framework for managing the grid flexibility to meet the net load demand, in both day-ahead and real-time timescales. Results also highlight the adequacy of the framework to adjust the scheduling, in real-time, to cope with large prediction errors of wind forecasting.

Framework of Health Recommender System for COVID-19 Self-assessment and Treatments: A Case Study in Malaysia

Othman, Mahfudzah,Zain, Nurzaid Muhd,Paidi, Zulfikri,Pauzi, Faizul Amir International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.1

This paper proposes a framework for the development of the health recommender system, designed to cater COVID-19 symptoms' self-assessment and monitoring as well as to provide recommendations for self-care and medical treatments. The aim is to provide an online platform for Patient Under Investigation (PUI) and close contacts with positive COVID-19 cases in Malaysia who are under home quarantine to perform daily self-assessment in order to monitor their own symptoms' development. To achieve this, three main phases of research methods have been conducted where interviews have been done to thirty former COVID-19 patients in order to investigate the symptoms and practices conducted by the Malaysia Ministry of Health (MOH) in assessing and monitoring COVID-19 patients who were under home quarantine. From the interviews, an algorithm using user-based collaborative filtering technique with Pearson correlation coefficient similarity measure is designed to cater the self-assessment and symptoms monitoring as well as providing recommendations for self-care treatments as well as medical interventions if the symptoms worsen during the 14-days quarantine. The proposed framework will involve the development of the health recommender system for COVID-19 self-assessment and treatments using the progressive web application method with cloud database and PHP codes.

Evaluation of the antinociceptive activities of natural propolis extract derived from stingless bee Trigona thoracica in mice

Nurul Alina Muhamad Suhaini,Mohd Faeiz Pauzi,Siti Norazlina Juhari,Noor Azlina Abu Bakar,Jee Youn Moon 대한통증학회 2024 The Korean Journal of Pain Vol.37 No.2

Background: Stingless bee propolis is a popular traditional folk medicine and has been employed since ancient times. This study aimed to evaluate the antinociceptive activities of the chemical constituents of aqueous propolis extract (APE) collected by Trigona thoracica in a nociceptive model in mice. Methods: The identification of chemical constituents of APE was performed using high-performance liquid chromatography (HPLC). Ninety-six male Swiss mice were administered APE (400 mg/kg, 1,000 mg/kg, and 2,000 mg/kg) before developing nociceptive pain models. Then, the antinociceptive properties of each APE dose were evaluated in acetic acid-induced abdominal constriction, hot plate test, and formalin-induced paw licking test. Administration of normal saline, acetylsalicylic acid (ASA, 100 mg/kg, orally), and morphine (5 mg/kg, intraperitoneally) were used for the experiments. Results: HPLC revealed that the APE from Trigona thoracica contained p-coumaric acid (R2 = 0.999) and caffeic acid (R2 = 0.998). Although all APE dosages showed inhibition of acetic acid-induced abdominal constriction, only 2,000 mg/kg was comparable to the result of ASA (68.7% vs. 73.3%, respectively). In the hot plate test, only 2,000 mg/ kg of APE increased the latency time significantly compared to the control. In the formalin test, the durations of paw licking were significantly reduced at early and late phases in all APE groups with a decrease from 45.1% to 53.3%. Conclusions: APE from Trigona thoracica, containing p-coumaric acid and caffeic acid, exhibited antinociceptive effects, which supports its potential use in targeting the prevention or reversal of central and peripheral sensitization that may produce clinical pain conditions.

Chance-constrained Scheduling of Variable Generation and Energy Storage in a Multi-Timescale Framework

Tan, Wen-Shan,Abdullah, Md Pauzi,Shaaban, Mohamed The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.5

This paper presents a hybrid stochastic deterministic multi-timescale scheduling (SDMS) approach for generation scheduling of a power grid. SDMS considers flexible resource options including conventional generation flexibility in a chance-constrained day-ahead scheduling optimization (DASO). The prime objective of the DASO is the minimization of the daily production cost in power systems with high penetration scenarios of variable generation. Furthermore, energy storage is scheduled in an hourly-ahead deterministic real-time scheduling optimization (RTSO). DASO simulation results are used as the base starting-point values in the hour-ahead online rolling RTSO with a 15-minute time interval. RTSO considers energy storage as another source of grid flexibility, to balance out the deviation between predicted and actual net load demand values. Numerical simulations, on the IEEE RTS test system with high wind penetration levels, indicate the effectiveness of the proposed SDMS framework for managing the grid flexibility to meet the net load demand, in both day-ahead and real-time timescales. Results also highlight the adequacy of the framework to adjust the scheduling, in real-time, to cope with large prediction errors of wind forecasting.

Synthesis and performance evaluation of zeolitic imidazolate framework-8 membranes deposited onto alumina hollow fiber for desalination

Nizar Mu’ammar Mahpoz,Norfazliana Abdullah,Mohamad Zahir Mohd Pauzi,Mukhlis A. Rahman,Khairul Hamimah Abas,Azian Abd Aziz,Mohd Hafiz Dzarfan Othman,Juhana Jaafar,Ahmad Fauzi Ismail 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.3

This work describes the development of zeolitic imidazolate framework-8 (ZIF-8) membranes on modified alumina hollow fiber for desalination by forward osmosis. Effects of different seeds (ZnO, NiO and PDA) and sodium formate on in-situ deposition of ZIF-8 were studied in relation to the membrane’s morphology and performance. XRD result shows that ZIF-8 was successfully synthesized in the presence of sodium formate. FESEM images showed PDA modified support was unsuccessful in producing well defined and dense ZIF-8 membrane layer even after another ZIF-8 re-deposition due to its minimal amount. The NiO modified support was also found unsuccessful, as ZIF-8 crystals were formed in clusters. On the contrary, dense ZIF-8 membrane was successfully prepared on ZnO modified support with SF-1 synthesis solution producing bigger ZIF-8 crystal and thinner ZIF-8 membrane than as of SF-2. Water flux performance in forward osmosis showed that NiO/ZIF-8, PDA/ZIF-8 and PDA/ZIF-8 (re-deposition) membranes gave negative water fluxes of 50 kg/m2·h, 5.2 kg/m2·h and 1.7 kg/m2·h with reverse solutes of 42.66 mol/m2·h, 27.42mol/m2·h and 3.22 mol/m2·h, respectively, indicating the solute from draw solution diffused into the feed solution. However, ZIF-8 membrane prepared using SF with molar ratio of 1, on the ZnO modified support had a water flux of 13.3 kg/m2·h, reverse solute of 0.95 kg/m2·h and salt rejection of 52.1%. When the SF ratio was increased to 2, the ZIF-8 membranes showed a water flux of 12.5 kg/m2·h, reverse solute of 1.64 kg/m2·h and salt rejection of 54.9%. The moderate salt rejection could be associated with defects in the ZIF-8 membranes due to poor grain boundaries.

Harmonic Distortion Contribution for the Transmission Loss Allocation in Deregulated Energy Market: A New Scheme for Industry Consumer

Nojeng, Syarifuddin,Hassan, Mohammad Yusri,Said, Dalila Mat,Abdullah, Md.Pauzi,Hussin, Faridah The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.1

The industry has rapidly growth and energy supply technology advanced are become main factor which to contribute of the harmonic losses. This problem is one aspect that may affect the capability of the transmission line and also to the efficiency of electricity. This paper proposes a new scheme to allocate the cost pertaining to transmission loss due to harmonics. The proposed method, called as Generalized Harmonic Distribution Factor, uses the principle of proportional sharing method to allocate the losses among the transmission users especially for industry consumers. The IEEE 14- and 30 bus test system is used to compare the proposed method with existing method. The results showed that the proposed method provided a scheme better in allocating the cost of transmission loss, which could encourage the users to minimize the losses.

Immobilization of Alcohol Dehydrogenase in Membrane: Fouling Mechanism at Different Transmembrane Pressure

Fauziah Marpani,Muhammad Kiflain Zulkifli,Farazatul Harnani Ismail,Syazana Mohamad Pauzi 대한화학회 2019 대한화학회지 Vol.63 No.4

Alcohol dehydrogenase (ADH) (EC 1.1.1.1) was selected as the enzyme which will be immobilized on ultrafiltration membrane by fouling with different transmembrane pressure of 1, 2 and 3 bars. ADH will catalyze formaldehyde (CHOH) to methanol (CH3OH) and simultaneously oxidized nicotinamide adenine dinucleotide (NADH) to NAD+. The concentration of enzyme and pH are fixed at 0.1 mg/ml and pH 7.0 respectively. The objective of the study focuses on the effect of different transmembrane pressure (TMP) on enzyme immobilization in term of permeate flux, observed rejection, enzyme loading and fouling mechanism. The results showed that at 1 bar holds the lowest enzyme loading which is 1.085 mg while 2 bar holds the highest enzyme loading which is 1.357 mg out of 3.0 mg as the initial enzyme feed. The permeate flux for each TMP decreased with increasing cumulative permeate volume. The observed rejection is linearly correlated with the TMP where increase in TMP will cause a higher observed rejection. Hermia model predicted that at irreversible fouling with standard blocking dominates at TMP of 3 bar, while cake layer and intermediate blocking dominates at 1 and 2 bar respectively.

Immobilization of Alcohol Dehydrogenase in Membrane: Fouling Mechanism at Different Transmembrane Pressure

Marpani, Fauziah,Zulkifli, Muhammad Kiflain,Ismail, Farazatul Harnani,Pauzi, Syazana Mohamad Korean Chemical Society 2019 대한화학회지 Vol.63 No.4

Alcohol dehydrogenase (ADH) (EC 1.1.1.1) was selected as the enzyme which will be immobilized on ultrafiltration membrane by fouling with different transmembrane pressure of 1, 2 and 3 bars. ADH will catalyze formaldehyde (CHOH) to methanol ($CH_3OH$) and simultaneously oxidized nicotinamide adenine dinucleotide (NADH) to $NAD^+$. The concentration of enzyme and pH are fixed at 0.1 mg/ml and pH 7.0 respectively. The objective of the study focuses on the effect of different transmembrane pressure (TMP) on enzyme immobilization in term of permeate flux, observed rejection, enzyme loading and fouling mechanism. The results showed that at 1 bar holds the lowest enzyme loading which is 1.085 mg while 2 bar holds the highest enzyme loading which is 1.357 mg out of 3.0 mg as the initial enzyme feed. The permeate flux for each TMP decreased with increasing cumulative permeate volume. The observed rejection is linearly correlated with the TMP where increase in TMP will cause a higher observed rejection. Hermia model predicted that at irreversible fouling with standard blocking dominates at TMP of 3 bar, while cake layer and intermediate blocking dominates at 1 and 2 bar respectively.

Managing COVID-19 Pandemic in the Community: A Primary Health Clinic Experience

Nurul Azreen Yusof,Siti Norazlina Juhari,Norwati Daud,Mohd Faeiz Pauzi,Najwa Diyana Ngah 대한가정의학회 2022 Korean Journal of Family Medicine Vol.43 No.4

The coronavirus disease 2019 (COVID-19) pandemic has affected several countries worldwide, including Malaysia, with the first reported case occurring in January 2020. Terengganu, a state on the east coast of Malaysia, is finding it challenging to contain the disease by aggressively instituting all public health measures to reduce the number of COVID-19 cases and community transmission. Our primary health clinic, which is situated in a semi-rural district in Terengganu, is also involved in the implementation of containment measures, community risk measurement, and the initial management of COVID-19 cases. The health clinic changed the clinic system for the delivery of healthcare services to avoid overcrowding of patients and adapted innovative ways of providing medical services, such as telemedicine and “drive-through” pharmacy. It also provided continuous health education and awareness regarding COVID-19 to both patients and clinic attendees. The essential element of combating the infection is the effective control of infection in a small, isolated clinic in which space and adequate facilities are known challenges. This study aimed to highlight the flow of COVID-19 management starting from screening, triaging, and manage-ment based on protocol, implementation of infection control measures, and training of healthcare workers in our health clinic. The mental health of these workers was managed by the Mental Health and Psychosocial Support Unit, as recommended by the Ministry of Health Malaysia. The role of primary care clinics in the ongoing pandem-ic is currently increasing. Hence, higher authority and the government must increase the number of facilities, hu-man resources, and financial budget to ensure that all initiatives can be implemented effectively.

Harmonic Distortion Contribution for the Transmission Loss Allocation in Deregulated Energy Market

Syarifuddin Nojeng,Mohammad Yusri Hassan,Dalila Mat Said,Md.Pauzi Abdullah,Faridah Hussin 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.1

The industry has rapidly growth and energy supply technology advanced are become main factor which to contribute of the harmonic losses. This problem is one aspect that may affect the capability of the transmission line and also to the efficiency of electricity. This paper proposes a new scheme to allocate the cost pertaining to transmission loss due to harmonics. The proposed method, called as Generalized Harmonic Distribution Factor, uses the principle of proportional sharing method to allocate the losses among the transmission users especially for industry consumers. The IEEE 14-and 30 bus test system is used to compare the proposed method with existing method. The results showed that the proposed method provided a scheme better in allocating the cost of transmission loss, which could encourage the users to minimize the losses.