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    Wyświetlanie 1-8 z 8
    Tytuł:
    An access control system for e-learning management systems
    Autorzy:
    Irfan, A. C.M.
    Takuya, K.
    Nomura, S.
    Yoshimi, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/951666.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    biometria
    nauczanie na odległość
    biometrics
    e-learning
    face identification
    Opis:
    Knowledge is a key factor to the personal success. The certifications are the instant tools that are commonly available to assess the personal success. In an e-Learning environment, where the learning projects are delivered with the aim to provide a professional or an academic certification, it is integral that the Learning Management Systems provide security features that will ensure the credibility of the online real-time assessments and the certification. In a conventional examination environment, there will be invigilators to overlook the examinees, on the contrary, in an on-line examination environment; it is vital that an invigilation mechanism is implemented to ensure the integrity of the examination. In this article we present a face based access control system for online e-Learning systems.
    Źródło:
    Journal of Medical Informatics & Technologies; 2009, 13; 41-46
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analysis of a multidimensional dataset of an epidemic study using soft computing tools - a pilot study
    Autorzy:
    Handri, S.
    Nomura, S.
    Irfan, A. C.M.
    Fukuda, S.
    Yamano, E.
    Watanabe, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/333077.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    epidemiologia
    analiza regresji logistycznej
    epidemiology
    logistic regression analysis
    feature set selection
    K-NN analysis
    Opis:
    Two contrasting approaches toward an epidemic study were illustrated as a pilot study; the regression analysis which is rather conventional methodology used in the past/present epidemic studies, and the other is the classifier analysis which is in the soft computing toolbox. The dataset we used for this study is obtained from a part of a cohort study which principally focused on a fatigue syndrome of the elementary and junior high school educates. In the classifier analysis we employed a major supervised machine-learning algorithm, K-Nearest Neighbour (K-NN), coupled with Principal Component Analysis (PCA). As a result, the performance that was found by cross validation method in the classifier analysis provides better results than that of the regression analysis. Finally we discussed the availability of both analyses with referring the technical and conceptual limitation of both approaches.
    Źródło:
    Journal of Medical Informatics & Technologies; 2009, 13; 107-110
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tuning the Charge Transfer and Optoelectronic Properties of 4,6-Di(Thiophene-2-YL)Pyrimidine via Oligocenothiophene Substitution
    Autorzy:
    Irfan, A.
    Chaudhry, A. R.
    Al-Sehemi, A. G.
    Muhammad, S.
    Jin, R.
    Tang, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/356638.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    organic semiconductors
    oligocene
    density functional theory
    optoelectronic properties
    charge transfer properties
    Opis:
    Five new derivatives of 4,6-di(thiophen-2-yl)pyrimidine (DTP) were designed by structural modification with the aim to tune the electro-optical and charge transfer properties. The effect of oligocene and oligocenothiophene incorporation/substitution was investigated on various properties of interests. The smaller hole reorganization energy revealed that compounds 1-5 might be good hole transfer contenders. The smaller hole reorganization energy of newly designed five DTP derivatives than the pentacene showed that prior compounds might be good/comparable hole transfer materials than/to that of pentacene. The computed electron reorganization energy of DTP derivatives 1-5 are 124, 185, 93, 95 and 189 meV smaller than the meridional-tris (8-hydroxyquinoline) aluminum (mer-Alq3) illuminating that electron mobility of these derivatives might be better/comparable than/to referenced compound.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1629-1636
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FORMULATION AND EVALUATION OF INDOMETHACIN LOADED NANOSPONGES FOR ORAL DELIVERY
    Autorzy:
    Abbas, Nasir
    Sarwar, Komal
    Irfan, Muhammad
    Hussain, Amjad
    Mehmood, Rabia
    Arshad, Muhammad S.
    Shah, Pervaiz A.
    Powiązania:
    https://bibliotekanauki.pl/articles/895238.pdf
    Data publikacji:
    2018-10-31
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    sustained release
    indomethacin
    Nanosponges
    Emulsion solvent diffusion method
    Franz diffusion cell
    Opis:
    Nanosponges (NS) loaded sustained release tablet formulations of a non-steroidal anti-inflammatory drug; Indomethacin were successfully developed and evaluated for their pharmaceutical properties. Twelve nanosponge formulations were fabricated by solvent diffusion method by using different ratios of drug and polymers (ethyl cellulose and polyvinyl alcohol). Particle size of all the formulations was in the nano range of 221 to 625 nm and it was found dependent on the polymer concentration. Drug loading and entrapment efficiency was ranged in 32.2 to 59.4 % and 30.1 to 64.8 %, respectively. Formulations with equal proportion of drug and polymer resulted in higher values of drug loading and entrapment efficiency. Percent yield was also found dependent on the relative drug polymer ratio with highest value of 51 % was achieved for the formulation having same drug to polymer ratio. SEM results confirmed the formation of spherical and porous structures. Structural analysis by Fourier transform infrared spectroscopy (FTIR), powder x-ray diffraction (PXRD) showed the absence of any interaction between drug and polymer. In comparison to pure drug, NS formulations showed a linear intrinsic dissolution rate (IDR) profile depicting a controlled release profile. Diffusion studies of NS formulations performed by Franz diffusion cell and dialysis bag methods showed comparable results in terms of precision and linearity of diffusion profile. Tablets prepared from the drug loaded NS showed acceptable values for hardness, friability and drug content. Release of drug from NS tablets was confirmed as sustained release behaviour.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 5; 1201-1213
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of High Entropy Alloy as Catalyst for Azo Dye Degradation in Fenton Process
    Autorzy:
    Hassan, Nur Hudawiyah Abu
    Nasir, Nisa Syukrina Mat
    Rahman, S. N. A.
    Irfan, Abd Rahim
    Nordin, Norhuda Hidayah
    Powiązania:
    https://bibliotekanauki.pl/articles/2203739.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    azo dye
    catalyst
    fenton process
    high entropy alloys
    HEAs
    Opis:
    Azo dye is widely used in the textile industry since it is cost effective and simple to use. However, it becomes a continuous source of environmental pollution due to its carcinogenicity and toxicity. Various methods had been used to remove the azo dye in solution. One of the famous and frequently used is the Fenton process. The Fenton process is one of the advanced oxidation processes where iron catalysed hydrogen peroxide to generate hydroxyl radical. Treating azo dyes in solution requires a catalyst to enhance the process of degradation. Herein, high entropy alloys (HEAs) have been proposed as a catalytic material to enhance the performance of Fenton process for azo dye degradation. HEAs have been reported as a promising catalyst due to its high surface area. The higher the number of active sites, the higher the rate of azo dye degradation as more active sites are available for adsorption of azo dyes. The results have shown that HEAs can be used as a catalyst to fasten the Fenton reaction since the degradation time is proven to be shorter in the presence of HEAs. The method derived from the result of this study will contribute in treating azo dyes for wastewater management in the Fenton process.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 209--213
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault Diagnosis of Three Phase Induction Motor Using Current Signal, MSAF-Ratio15 and Selected Classifiers
    Autorzy:
    Glowacz, A.
    Glowacz, W.
    Glowacz, Z.
    Kozik, J.
    Gutten, M.
    Korenciak, D.
    Khan, Z. F.
    Irfan, M.
    Carletti, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/356557.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fault
    current
    electrical signals
    induction motor
    diagnostics
    classification
    Opis:
    A degradation of metallurgical equipment is normal process depended on time. Some factors such as: operation process, friction, high temperature can accelerate the degradation process of metallurgical equipment. In this paper the authors analyzed three phase induction motors. These motors are common used in the metallurgy industry, for example in conveyor belt. The diagnostics of such motors is essential. An early detection of faults prevents financial loss and downtimes. The authors proposed a technique of fault diagnosis based on recognition of currents. The authors analyzed 4 states of three phase induction motor: healthy three phase induction motor, three phase induction motor with 1 faulty rotor bar, three phase induction motor with 2 faulty rotor bars, three phase induction motor with faulty ring of squirrel-cage. An analysis was carried out for original method of feature extraction called MSAF-RATIO15 (Method of Selection of Amplitudes of Frequencies – Ratio 15% of maximum of amplitude). A classification of feature vectors was performed by Bayes classifier, Linear Discriminant Analysis (LDA) and Nearest Neighbour classifier. The proposed technique of fault diagnosis can be used for protection of three phase induction motors and other rotating electrical machines. In the near future the authors will analyze other motors and faults. There is also idea to use thermal, acoustic, electrical, vibration signal together.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2413-2419
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A review of the importance of synchrophasor technology, smart grid, and applications
    Autorzy:
    Baba, Maveeya
    Nor, Nursyarizal B.M.
    Sheikh, Aman
    Nowakowski, Grzegorz
    Masood, Faisal
    Rehman, Masood
    Irfan, Muhammad
    Arefin, Ahmed Amirul
    Kumar, Rahul
    Baba, A. Momin
    Powiązania:
    https://bibliotekanauki.pl/articles/2173713.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phasor measurement unit
    PMU
    micro-PMU
    Global Positioning System
    GPS
    optimal PMU placement
    smart grid
    SG
    jednostka pomiaru fazorów
    mikro-PMU
    globalny system pozycjonowania
    optymalne rozmieszczenie PMU
    sieć inteligentna
    Opis:
    The electrical network is a man-made complex network that makes it difficult to monitor and control the power system with traditional monitoring devices. Traditional devices have some limitations in real-time synchronization monitoring which leads to unwanted behavior and causes new challenges in the operation and control of the power systems. A Phasor measurement unit (PMU) is an advanced metering device that provides an accurate real-time and synchronized measurement of the voltage and current waveforms of the buses in which the PMU devices are directly connected in the grid station. The device is connected to the busbars of the power grid in the electrical distribution and transmission systems and provides time-synchronized measurement with the help of the Global Positioning System (GPS). However, the implementation and maintenance cost of the device is not bearable for the electrical utilities. Therefore, in recent work, many optimization approaches have been developed to overcome optimal placement of PMU problems to reduce the overall cost by providing complete electrical network observability with a minimal number of PMUs. This research paper reviews the importance of PMU for the modern electrical power system, the architecture of PMU, the differences between PMU, micro-PMU, SCADA, and smart grid (SG) relation with PMU, the sinusoidal waveform, and its phasor representation, and finally a list of PMU applications. The applications of PMU are widely involved in the operation of power systems ranging from power system control and monitor, distribution grid control, load shedding control and analyses, and state estimation which shows the importance of PMU for the modern world.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143826
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction of Tannic Acid from Kenaf Bast Fibre using Ultrasonic Assisted Extraction
    Autorzy:
    Mohamad, Mardawani
    Ibrahim, H. A.
    Nasir, M. F. M.
    Mohidem, Nur Atikah
    Shoparwe, N. F.
    Teo, Pao Ter
    Masri, Mohamad Najmi
    Irfan, Abd Rahim
    Powiązania:
    https://bibliotekanauki.pl/articles/2134102.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrasonic assisted extraction
    UAE
    sonication time
    duty cycle
    extraction process
    kenaf bast fibre
    Opis:
    Tannic acid or tannin, type of phenolic compound contains in kenaf bast fibre. Conventional extraction has certain limitations in terms of time, energy, and solvent consumption. Ultrasound assisted extraction (UAE) can extract bioactive components in shorter time, low temperature, with lesser energy and solvent requirement. UAE as alternative extraction technique is better equipped to retain the functionality of the bioactive compounds. In this study, the conditions for ultrasound assisted extraction (UAE) of tannic acid from kenaf bast fibre by assessing the effect of sonication time and different duty cycles were optimized. The use of ultrasound to extract tannic acid from kenaf bast fiber was evaluated. Ultrasound-assisted extraction (UAE) was carried out using ethanol as solvent to intensify the extraction efficacy. Phytochemical screening was conducted to identify the presence of tannic acid in extracts. The extracts then were analyzed using High-Performance Liquid Chromatography (HPLC) and Scanning Electron Microscopy (SEM). It was found that 0.2429 mg/mL of tannic acid was obtained under the extraction conditions of extraction temperature of 40℃, sonication time of 20 minutes and duty cycle of 50%. From SEM analysis, it was found that the raw sample demonstrated rough surface and no porous but kenaf bast fibre display smoother surface with less impurities and few pores appeared after the extraction process using UAE. These results indicate that ultrasound-assisted extraction is an efficient method for extracting tannic acid from kenaf bast fibre with the advantages of lower extraction time and higher extraction yield.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1061--1066
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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