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Development Model for Knowledge Management System (KMS) to Improve University's Performance (Case Studies in Indonesia University of Education)

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International Journal of Computer Science Issues 2012年第1 1-1期9卷 1-6页

作者： Munir Rohendi, Dedi Study Program of Computer Science Faculty of Mathematics and Sciences Education Indonesia University of Education Bandung Indonesia Mechanical Engineering Education Department Faculty of Technology and Vocational Education Indonesia University of Education Bandung Indonesia

Knowledge Management System (KMS) is one way to organize and documented the knowledge of institution. The purpose of this study is to develop a prototype KMS in organizing and documenting the knowledge in the university and to do a document aggregation based on the total number, subjects and writers (lecturers). The development method of KMS prototype is using sharepoints which are able to collect, store and publish all digital data available at the university which can be accessed online. Aggregation is using the percentage between the number of documents, subjects, and writers (lecturers). The aggregation's result between the number of digital files compared to the number of courses and the number of lecturers are each below 10%. In the future, the university still needs to encourage all lecturers or academic community to increase the collection of digital files that can indirectly improve the quality and educational services. © 2012 International Journal of Computer Science Issues.

关键词： Knowledge based systems

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Multilayer thin film growth on crystalline and quasicrystalline surfaces: A phase-field crystal study

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Physical Review B 2012年第24期85卷 245428-245428页

作者： Srevatsan Muralidharan Raika Khodadad Ethan Sullivan Mikko Haataja Department of Mechanical and Aerospace Engineering Princeton Institute for the Science and Technology of Materials (PRISM) Program in Applied and Computational Mathematics (PACM) Princeton University Princeton New Jersey 08544 USA and School of Mathematics Institute for Advanced Study Princeton New Jersey 08540 USA

In this paper, we explore the effects of misfit strain fields on both heterogeneous nucleation behavior and anisotropic growth of islands at submonolayer coverages and compositional patterning at complete monolayer coverage via simulations of a phase-field crystal model. In particular, deposition on top of a herringbone structure and quasicrystalline (QC) substrate are considered, the former representing a system with spatially periodic misfit strain fields arising from the presence of surface dislocations, and the latter representing a system which inherently possesses a wide range of local, aperiodic misfit patterns. In the case of single-component systems, we demonstrate that misfit strain fields lead to heterogeneous nucleation behavior and anisotropic island growth. In the case of QC substrate, a wide range of morphologies, such as coexistence of locally hexagonally ordered atomic clusters within a larger scale arrangement with overall QC symmetry and so-called “starfish” aggregates, is observed in a pure system at submonolayer coverages when the adlayer-substrate interaction strength and lattice mismatch are tuned. In the case of bulk-immiscible binary systems at complete monolayer coverage, strain-stabilized compositional domains emerge at low line tension values for both substrates. Interestingly, the compositional domains on the QC substrate inherit their symmetries at sufficiently low line tension values, while at larger line tension values, the domain structure begins to resemble the classical spinodal microstructure. Such domain structures should be readily observable in colloidal systems in which attractive interparticle and particle-substrate interactions can be tuned.

关键词： THIN films CRYSTALS NUCLEATION DISLOCATIONS in crystals MICROSTRUCTURE

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Nonlinear Geometric Effects in mechanical Bistable Morphing Structures

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Physical Review Letters 2012年第11期109卷 114302-114302页

作者： Zi Chen Qiaohang Guo Carmel Majidi Wenzhe Chen David J. Srolovitz Mikko P. Haataja Department of Mechanical and Aerospace Engineering Princeton University Princeton New Jersey 08544 USA Princeton Institute for the Science and Technology of Materials (PRISM) Princeton University Princeton New Jersey 08544 USA Department of Biomedical Engineering Washington University St. Louis Missouri 63130 USA College of Materials Science and Engineering Fuzhou University Fuzhou Fujian 350108 China Department of Mathematics and Physics Fujian University of Technology Fuzhou Fujian 350108 China Department of Mechanical Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Department of Materials Science and Engineering Fujian University of Technology Fuzhou Fujian 350108 China Institute for High Performance Computing 1 Fusionopolis Way Singapore 138632 Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA School of Mathematics Institute for Advanced Study Princeton New Jersey 08540 USA

Bistable structures associated with nonlinear deformation behavior, exemplified by the Venus flytrap and slap bracelet, can switch between different functional shapes upon actuation. Despite numerous efforts in modeling such large deformation behavior of shells, the roles of mechanical and nonlinear geometric effects on bistability remain elusive. We demonstrate, through both theoretical analysis and tabletop experiments, that two dimensionless parameters control bistability. Our work classifies the conditions for bistability, and extends the large deformation theory of plates and shells.

关键词： NONLINEAR theories DEFORMATIONS (Mechanics) PARAMETER estimation OPTICAL bistability STRUCTURAL shells PLATES (engineering) CRYSTAL structure

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Application of STATCOM to improve the high-voltage-ride-through capability of wind turbine generator

Application of STATCOM to improve the high-voltage-ride-thro...

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IEEE Power and Energy Society'sInnovative Smart Grid Technologies Asia 2011 Conference,ISGT Asia 2011

作者： Alharbi, Y.M. Shiddiq Yunus, A.M. Abu-Siada, A. King Abdullah Scholarship Program Australia Departement of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujungpandang Perintis Kemerdekaan KM. 10 Makassar 90215 Indonesia Department of Electrical and Computer Engineering Curtin University Perth WA 6845 Australia

ISBN: (纸本)9781457708756

Variable speed wind turbine with full scale converter or so-called type-D wind turbine generator worldwide installation has been significantly increased in the last few years. Voltage Swell in the grid side may cause the wind turbine to be disconnected from the grid. In this paper, STATCOM is applied to improve the high voltage ride through capability of type-D wind turbine during voltage swell in the grid side. Simulation is carried out using MATLAB/Simulink software. Results show that STATCOM can significantly improve the high voltage ride through (HVRT) capability of type-D wind turbine and prevents it from being disconnected from the grid during certain level of voltage swell in the grid side. © 2011 IEEE.

关键词： Static synchronous compensators

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Application of SMES unit to improve the high-voltage-ride-through capability of DFIG-grid connected during voltage swell

Application of SMES unit to improve the high-voltage-ride-th...

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IEEE Power and Energy Society'sInnovative Smart Grid Technologies Asia 2011 Conference,ISGT Asia 2011

作者： Shiddiq Yunus, A.M. Abu-Siada, A. Masoum, M.A.S. Department of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujung Pandang Perintis Kemerdekaan KM. 10 Makassar 90245 Indonesia Department of Electrical and Computer Engineering Curtin University Perth WA Australia

ISBN: (纸本)9781457708756

The amount of wind turbine connected to the power grid has significantly increased during the last decade. This has resulted in essential need to establish grid codes. Previously, wind turbine generators (WTGs) were allowed to be disconnected from the network during any disturbance at the grid side to avoid WTGs from being damaged. However, lately, the transmission system operators (TSOs) require WTGs to be stayed connected to provide support to the grid during fault. This new requirement has been regulated in the new grid codes. In this paper, the super conducting magnetic energy storage (SMES) unit is used to enhance the high voltage ride through (HVRT) capability of DFIG based WTG during voltage swell events at the grid side. Two new grid codes are used to verify the ability of the SMES unit to avoid the WTG from being disconnected from the grid. © 2011 IEEE.

关键词： Wind Turbine Generators

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Improvement of LVRT capability of variable speed wind turbine generators using SMES unit

Improvement of LVRT capability of variable speed wind turbin...

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IEEE Power and Energy Society'sInnovative Smart Grid Technologies Asia 2011 Conference,ISGT Asia 2011

作者： Shiddiq Yunus, A.M. Abu-Siada, A. Masoum, Mohammad A. S. Department of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujung Pandang Perintis Kemerdekaan KM. 10 Makassar 90245 Indonesia Department of Electrical and Computer Engineering Curtin University Perth WA Australia

ISBN: (纸本)9781457708756

The ability of variable speed wind turbines technology to optimally tracking the power from wind energy has become the main reason of their popularity compared with the fixed speed wind turbines. In the earlier stage of connecting wind turbines (WTs) to the existing electricity grids, WTs were allowed to be disconnected from the grid in case of grid faults which might lead to the damage of the turbines. However, recently, the transmission system operators (TSOs) require to maintaining the connection of WTs with the grid to support the grid during fault and to assure the continuity of power supply. This requirement has been compiled in new grid codes in several countries. In this paper, super conducting magnetic energy storage (SMES) unit is used with two different types of variable speed wind turbine generators to comply with Spain grid codes. Results show that the low-voltage-ride-through (LVRT) of Type-3 and Type-4 wind turbine generators are significantly improved when SMES unit is connected to the system. © 2011 IEEE.

关键词： Wind power

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Effect of STATCOM on the low-voltage-ride-through capability of type-D wind turbine generator

Effect of STATCOM on the low-voltage-ride-through capability...

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IEEE Power and Energy Society'sInnovative Smart Grid Technologies Asia 2011 Conference,ISGT Asia 2011

作者： Shiddiq Yunus, A.M. Masoum, Mohammad A. S. Abu-Siada, A. Departement of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujungpandang Perintis Kemerdekaan KM. 10 Makassar 90215 Indonesia Department of Electrical and Computer Engineering Curtin University Perth WA 6845 Australia

ISBN: (纸本)9781457708756

Variable speed wind turbine with full scale converter or so-called Type-D wind turbine generator worldwide installation has been significantly increased in the last few years. Voltage sag in the grid side may cause the wind turbine to be disconnected from the grid. In this paper, effect of STATCOM on the low voltage ride through capability of Type-D wind turbine during voltage sag in the grid side is studied. Simulation is carried out using MATLAB/Simulink software. Results show that STATCOM can significantly improve the voltage profile at the Point of Common Coupling (PCC) and improve the capability of Type-D wind turbine and prevents it from being disconnected from the grid during certain level of voltage sag in the grid side. © 2011 IEEE.

关键词： Static synchronous compensators

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Effects of SMES on Dynamic Behaviors of Type D-Wind Turbine Generator-Grid Connected during Short Circuit

Effects of SMES on Dynamic Behaviors of Type D-Wind Turbine ...

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IEEE Power and Energy Society General Meeting

作者： A. M. Shiddiq Yunus A. Abu-Siada M. A. S. Masoum Department of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujungpandang Department of Electrical and Computer Engineering Curtin University

ISBN: (纸本)9781457710001

Application of Superconducting Magnetic Energy Storage unit with Hysteresis Current Control-Fuzzy Logic to improve the performance of Wind Turbine Generator-Grid connected during short circuit is presented. Five 2 MW Type D-Wind Turbine Generator connected to a grid is simulated using SIMULINK/MATLAB program. The Superconducting Magnetic Energy Storage unit consists of a Voltage Source Converter and DC-DC Chopper that are controlled by Hysteresis Current Control and Fuzzy Logic Controller respectively. Simulation results show that the proposed control algorithm of Superconducting Magnetic Energy Storage unit is effective in saving some MWs of Type D-Wind Turbine Generator production during occurrence of short circuit in the line.

关键词： Fuzzy Logic Hysteresis Current Control Superconducting magnetic energy storage Type D-Wind Turbine Generator SUPERCONDUCTING MAGNETIC ENERGY STORAGE Fuzzy logic Wind Generators Short circuits voltage source converter turbogenerators Computer algorithms fuzzy logic controller

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Effect of STATCOM on the low-voltage-ride-through capability of Type-D wind turbine generator

Effect of STATCOM on the low-voltage-ride-through capability...

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IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： A. M. Shiddiq Yunus Mohammad A. S. Masoum A. Abu-Siada Department of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujungpandang Makassar Indonesia Department of Electrical nd Computer Engineering Curtin University Perth WA Australia

关键词： Automatic voltage control Wind turbines Voltage fluctuations Educational institutions Reactive power Power system stability

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Application of SMES unit to improve the high-voltage-ride-through capability of DFIG-grid connected during voltage swell

Application of SMES unit to improve the high-voltage-ride-th...

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IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： A. M. Shiddiq Yunus A. Abu-Siada M. A. S. Masoum Department of Mechanical Engineering Energy Conversion Study Program State of Polytechnic Ujung Pandang Makassar Indonesia Department of Electrical and Computer Engineering Curtin University of Technology Perth WA Australia

关键词： Coils Wind turbines Fuzzy logic Generators Reactive power Input variables Voltage fluctuations

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