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The Use of Multimedia Learning Resource Sharing (MLRS) in Developing Sharing Knowledge at Schools
Munir 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.9
This study aimed to develop school community to share knowledge by using Multimedia Learning Resource Sharing (MLRS). MLRS was developed as a means for educators and learners across schools to share online based internet. To measure MLRS’s acceptance as a medium of sharing knowledge, Technology Acceptance Model (TAM) was used as a model of approach. This study tried to explore factors that were dominant, interrelated and influential to the level of MLRS’s acceptance in sharing knowledge. Structural Equation Modeling (SEM) was used to analyze the data. The present study revealed that user Content Management (CM) affected Perceived Ease of Use (PEoU), while Content management (CM) and PEoU affected the benefits of Perceived Usefulness (PU). PEoU and PU affected Intention to Use (ITU); and ITU affected Actual System Usage (ASU). In general, the presence of MLRS received a positive acceptance from users in developing sharing knowledge between Senior High schools in West Java.
Design and Dynamic Performance Analysis of a Stand-alone Microgrid
Munir Husein,Vu Ba Hau,Il-Yop Chung,Woo-Kyu Chae,Hak-Ju Lee 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.5
This paper presents the design and dynamic analysis of a stand-alone microgrid with high penetration of renewable energy. The optimal sizing of various components in the microgrid is obtained considering two objectives: minimization of levelized cost of energy (LCOE) and maximization of renewable energy penetration. Integrating high renewable energy in stand-alone microgrid requires special considerations to assure stable dynamic performance, we therefore develop voltage and frequency control method by coordinating Battery Energy Storage System (BESS) and diesel generators. This approach was applied to the design and development of Gasa Island microgrid in South Korea. The microgrid consists of photovoltaic panels, wind turbines, lithium-ion batteries and diesel generators. The dynamic performance of the microgrid during different load and weather variations is verified by simulation studies. Results from the real microgrid were then presented and discussed. Our approach to the design and control of microgrid will offer some lessons in future microgrid design.
Lateral Crushing Properties of Non-Woven Kenaf (Mat)- Reinforced Epoxy Composite Hexagonal Tubes
Munir Faraj Almbrouk Alkbir,Mohd Sapuan b. Salit,Nuraini bt. Abdul Aziz,Mohamad Ridzwan Ishak 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.7
The current study investigated the energy absorption capability and load carrying capacity of non-woven natural kenaf fiber (mat)/ epoxy–hexagonal composite tubes subjected to a lateral quasi-static crushing test. The hexagonal composite tubes were manufactured by the hand lay-up technique. Natural non-woven kenaf (mat) was chosen as reinforcement due to low cost, low specific weight, easy processing, no need for tooling when dealing with the raw material, and no skin irritation and epoxy resin was used as the matrix to manufacture three configurations of β=40o, β=50o and β=60o of natural non-woven kenaf (mat)/epoxy laminate. The effects of hexagonal angles, supporting plate inside the tubes, and failure modes were studied by a lateral compression test. The crashworthiness of the tubes was evaluated by analysis of the specific energy absorption in quasi-static lateral compression. Specific energy absorption (SEA) was obtained from the load–displacement curve during testing. The failure mode of the tubes was analyzed from high-resolution photographs. Overall, the tube with β=40o had the best crashworthiness among the tubes. Furthermore, the results showed that the tubes with supporting plates have better specific energy absorption for all tested specimens and exhibited approximately 69% better crashworthiness than the non-supporting ones. The results also demonstrated that all specimens failed by the longitudinal failure mode.
Polyelectrolytes functionalized nematic liquid crystal-based biosensors: An overview
Munir, S.,Kang, I.K.,Park, S.Y. Elsevier Scientific Pub. Co 2016 Trends in analytical chemistry Vol.83 No.2
<P>The liquid crystalline state of matter arises from orientation-dependent and non-covalent interactions between molecules within condensed phases. Because the balance of intermolecular forces that underlies the formation of liquid crystals (LCs) is delicate, this state of matter can be easily perturbed by external stimuli in general, and therefore it has been applied to biosensors since the last two decades. LCs has been functionalized with polyelectrolytes (PEs) to obtain stability and specificity, and to facilitate the immobilization of enzymes, anti bodies, and ligands at the LC/aqueous interface. This review focuses on the LC/aqueous interface functionalized with various kinds of PEs that yield a fundamentally interesting and technologically promising class of interfaces, and their uses for chemical and biological sensing. (C) 2016 Elsevier B.V. All rights reserved.</P>
Munir, Hafiz Mudassir,Zou, Jianxiao,Xie, Chuan,Li, Kay,Younas, Talha,Guerrero, Josep M. The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
The application of shunt active power filters (S-APFs) is considered to be the most popular approach for harmonic compensation due to its high simplicity, ease of installation and efficient control. Its functionality mainly depends upon the rapidness and precision of its internally built control algorithms. A S-APF is generally operated in the current controlled mode (CCM) with the detection of harmonic load current. Its operation may not be appropriate for the distributed power generation system (DPGS) due to the wide dispersion of nonlinear loads. Despite the fact that the voltage detection based resistive-APF (R-APF) appears to be more appropriate for use in the DPGS, the R-APF experiences poor performance in terms of mitigating harmonics and parameter tuning. Therefore, this paper introduces a direct harmonic voltage detection based control approach for the S-APF that does not need a remote harmonic load current since it only requires a local point of common coupling (PCC) voltage for the detection of harmonics. The complete design procedure of the proposed control approach is presented. In addition, experimental results are given in detail to validate the performance and superiority of the proposed method over the conventional R-APF control. Thus, the outcomes of this study approve the predominance of the discussed strategy.