Pusat Pengajian Pendidikan Jarak Jauh

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    Comparison Of Parameter Estimators Of Lognormal Distribution For Predicting Pm10 And Pm2.5 Concentrations
    (2024-11)
    Omar, Muhammad Uthman
    Pm₁₀ and pm₂.₅ are among the dominant air pollutants in malaysia and have caused severe adverse effects on human health, especially on children, pregnant mothers, and senior citizens. To better understand the distribution of pm₁₀ and pm₂.₅, statistical modelling using the lognormal distribution was used because of its positively-skewed nature and is regarded as the most appropriate distribution for particulate matter in malaysia. The lognormal distribution has two parameters namely location and scale parameters. Parameter estimation is a crucial step in getting the best prediction since the value of location and scale parameters can affect the error and accuracy of the prediction. In this study, four different estimators namely the method of moments (mom), maximum likelihood estimator (mle), probability weighted moments (pwm), and uniformly minimum variance unbiased estimator (umvue) were used to estimate the location and scale parameters. Hourly data of pm₁₀ and pm₂.₅ concentrations from 2017 to 2020 on four different classifications of monitoring stations namely jerantut as background, sungai petani as suburban, alor setar as urban, and perai as industrial were used.
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    VLSI Implementation Of A Systolic Array Viterbi Decoder
    (1995-03)
    Mohd. Noh, Norlaili
    This project is on developing a Vi terbi decoder which uses the trace-back method structured in a systolic array fashion. It is believed that this architecture can reduce the size of the decoder as it minimizes the connections between component modules and requires a smaller storage space. The trace-back method can reduce the amount of hardware which is normally a problem with register exchange decoder. It is also suitable for achieving a higher speed of operation as tracking, updating and storage of the information sequence can be accomplished simultaneously during a single clock cycle.
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    Titanium-Based Metal-Organic Framework And Its Modifications By Thermal Decomposition For Visible Light Photocatalytic Activity
    (2024-03)
    Abdul Mubarak, Nur Shazwani
    This study is divided into three sections. Firstly, MIL-125-NH2 was prepared using a solvothermal method with a constant inert gas flow to create an inert condition. Then, MIL-125-NH2 was calcined at various temperatures under an inert atmosphere (argon gas) to produce nitrogen-doped carbon porous titanium dioxide (N-C/TiO2). Following the same procedure, two different modifications of Ni-doped and ZnO composites were prepared by varying the weight percentage (wt%). Ni-doped (NC/NiT), and ZnO composites (NC/ZnOT) were produced by subjecting the optimal wt% of both modifications through different calcination temperatures under argon gas.
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    Gerakan Environmentalisme Dan Hubungannya Dengan Proses Pendemokrasian Di Malaysia: Kajian Kes Di Perak (2008-2018)
    (2024-02)
    Abd Matalib, Mohamad Faizal
    Tesis ini mengkaji gerakan environmentalisme di negeri Perak dan impaknya ke atas proses pendemokrasian di negara ini. Bagi menjawab persoalan dan objektif kajian ini, kerangka teoritikal dan konseptual iaitu masyarakat sivil, gerakan environmentalisme dan pendemokrasian telah digunakan.
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    Research On Photovoltaic Mppt Control Method Based On Improved Bas Algorithm And Variable Step-Size Inc Method
    (2024-03)
    Li, Wenli
    Solar energy has received widespread attention and has been developed due to its distinct advantages, such as abundant reserves and not restricted by geography. However, the PV module is easily affected by external environments in practical applications, leading to a decrease in PV power. MPPT technology for the PV power system is an effective method to improve the efficacy of PV electricity conversion. Commonly used control methods include CVT method, perturbation and observation method, and incremental conductance method. These methods differ greatly in terms of required parameters, algorithm complexity, tracking speed, tracking accuracy, hardware requirements, etc. In this study, a MPPT control method based on IBAS and VSINC was proposed to obtain a better performance in MPPT.