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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.
Munir, Rahim,Jung, Gwang Sun,Ko, Young Min,Ahn, Byung Tae Materials Research Society of Korea 2013 한국재료학회지 Vol.23 No.3
$Cu_2ZnSn(S,Se)_4$ material is receiving an increased amount of attention for solar cell applications as an absorber layer because it consists of inexpensive and abundant materials (Zn and Sn) instead of the expensive and rare materials (In and Ga) in $Cu(In,Ga)Se_2$ solar cells. We were able to achieve a cell conversion efficiency to 4.7% by the selenization of a stacked metal precursor with the Cu/(Zn + Sn)/Mo/glass structure. However, the selenization of the metal precursor results in large voids at the absorber/Mo interface because metals diffuse out through the top CZTSe layer. To avoid the voids at the absorber/Mo interface, binary selenide compounds of ZnSe and $SnSe_2$ were employed as a precursor instead of Zn and Sn metals. It was found that the precursor with Cu/$SnSe_2$/ZnSe stack provided a uniform film with larger grains compared to that with $Cu_2Se/SnSe_2$/ZnSe stack. Also, voids were not observed at the $Cu_2ZnSnSe_4$/Mo interface. A severe loss of Sn was observed after a high-temperature annealing process, suggesting that selenization in this case should be performed in a closed system with a uniform temperature in a $SnSe_2$ environment. However, in the experiments, Cu top-layer stack had more of an effect on reducing Sn loss compared to $Cu_2Se$ top-layer stack.
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>
In situ analysis of capturing dynamics of magnetic nanoparticles in a microfluidic system
Munir, Ahsan,Zhu, Zanzan,Wang, Jianlong,Zhou, H. Susan Techno-Press 2013 Smart Structures and Systems, An International Jou Vol.12 No.1
Magnetic nanoparticle based bioseparation in microfluidics is a multiphysics phenomenon that involves interplay of various parameters. The ability to understand the dynamics of these parameters is a prerequisite for designing and developing more efficient magnetic cell/bio-particle separation systems. Therefore, in this work proof-of-concept experiments are combined with advanced numerical simulation to design and optimize the capturing process of magnetic nanoparticles responsible for efficient microfluidic bioseparation. A low cost generic microfluidic platform was developed using a novel micromolding method that can be done without a clean room techniques and at much lower cost and time. Parametric analysis using both experiments and theoretical predictions were performed. It was found that flow rate and magnetic field strength greatly influence the transport of magnetic nanoparticles in the microchannel and control the capturing efficiency. The results from mathematical model agree very well with experiments. The model further demonstrated that a 12% increase in capturing efficiency can be achieved by introducing of iron-grooved bar in the microfluidic setup that resulted in increase in magnetic field gradient. The numerical simulations were helpful in testing and optimizing key design parameters. Overall, this work demonstrated that a simple low cost experimental proof-of-concept setup can be synchronized with advanced numerical simulation not only to enhance the functional performance of magneto-fluidic capturing systems but also to efficiently design and develop microfluidic bioseparation systems for biomedical applications.