Multi-label classification for physical activity recognition from various accelerometer sensor positions

In recent years, the use of accelerometers embedded in smartphones for Human Activity Recognition (HAR) has been well considered. Nevertheless, the role of the sensor placement is yet to be explored and needs to be further investigated.In this study, we investigated the role of sensor placements for recognizing various types of physical activities using the accelerometer sensor embedded in the smartphone. In fact, most of the reported work in HAR utilized traditional multi-class classification approaches to determine the types of activities.Hence, this study was to recognize the activity based on the best sensor placements that are appropriate to the activity performed. The traditional multi-class classification approach required more manual work and was time consuming to run the experiment separately.Thus, this study proposed the multi- label classification technique with the Label Combination (LC) approach in order to tackle this issue.The result was compared with several state-of-the-art traditional multi-class classification approaches. The multi-label classification result significantly outperformed the traditional multi-class classification methods as well as minimized the model build time

Optical properties of zinc borotellurite glass system doped with erbium and erbium nanoparticles for photonic applications

t Comparative analysis on optical properties between two glass series (a—ordinary glass, b—glass with nanoparticles) have been estimated. The two glass series (a—ordinary glass, b—glass with nanoparticles) with compositions {[(TeO2)0.70 (B2O3)0.30]0.70 (ZnO)0.30}1-y (Er2O3/Er2O3 nanoparticles)y; y = 0.005, 0.01, 0.02, 0.03, 0.04, 0.05 mol% were successfully prepared by using meltquenching method. The TEM, EDX and XRD have been used to confirm the existence of nanoparticles and all elements in the glass system. The density of b—glass with nanoparticles are found greater than a—ordinary glass. The optical properties of the glass series were characterized by using Ellipsometer and UV–Vis spectrophotometer. There is a linear increasing trend in refractive index of the glass series along with concentration of erbium and erbium nanoparticles oxide. The refractive index of b—glass with nanoparticles is greater than a—ordinary glass. Moreover, the absorption peaks of a—ordinary glass are more intense than b—glass with nanoparticles. The glass with nanoparticles will offer a potential materials for nanophotonic devices

Effectiveness of Porous Durian Shell-based Activated Carbon for Methylene Blue Adsorption

In this study, durian shell-based activated carbon (DAC) was produced via chemical activation method by utilising durian shell and sulphuric acid (H2SO4) as the starting material and activating agent, respectively. The incorporation of H2SO4 in the DAC production process resulted an improvement in the surface properties and adsorption capacity of the produced DAC adsorbent. Field emission scanning electron microscopy analysis further showed that the produced DAC possessed a porous structure which was beneficial for dye adsorption application. Under operating conditions of 500°C and 3 hours carbonisation temperature and time, the Brunauer–Emmett–Teller (BET) surface area, total pore volume and BET average pore diameter were measured to be 242.03 m2/g, 0.028 cm3/g and 2.28 nm, respectively. The adsorption performance of the produced DAC was then investigated using methylene blue (MB) as the model adsorbate. The optimum MB dye removal and adsorption capacity were found to be 92.05% and 0.767 mg/g, respectively, with 0.6 g of DAC dosage, 10 ppm of initial MB dye concentration and 15 min of contact time.

Tinjauan Faktor Kritikal Kejayaan Penglibatan Syarikat Perniagaan dalam Industri Sukan di Malaysia

Industri sukan merupakan satu industri komersial yang mempunyai nilai pasaran yang tinggi dan mula berkembang di Malaysia. Penglibatan syarikat-syarikat perniagaan dalam industri sukan akan menjadi pemangkin transformasi ekonomi negara berpendapatan tinggi di masa hadapan. Justeru kajian ini bertujuan mengenal pasti faktor kritikal kejayaan penglibatan syarikat perniagaan dalam industri sukan di Malaysia. Kajian ini menggunakan kaedah tinjauan yang melibatkan 32 buah syarikat perniagaan yang dipilih secara persampelan rawak. Instrumen faktor kritikal kejayaan (critical success factor) digunakan dalam kajian ini dan data dianalisis menggunakan statistik deskriptif. Hasil dapatan menunjukkan faktor kritikal kejayaan dari aspek Organisasi adalah di tahap tinggi dan positif dengan skor M=4.03. Diikuti faktor Perundangan M=3.94, faktor Sikap M=3.88, faktor Komunikasi M=3.75 dan faktor Politik M=3.69. Manakala faktor kritikal kejayaan dari aspek Situasi dan Ekonomi di tahap sederhana dan juga positif dengan skor M=3.66 dan M=3.31. Hasil kajian ini dijangka mampu membantu pihak kerajaan dalam mengatur perancangan dan strategi bagi memastikan industri sukan menjadi antara penyumbang utama ekonomi negara