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Syamsuddin I.,State Polytechnic of Ujung Pandang | Hwang J.,International University of Korea
Journal of Software | Year: 2010

In this paper, we introduce a framework to guide decision makers evaluating information security policy performance. It is motivated by lack of adequate decision making mechanism with broader scopes and easy to use for the decision makers. The framework, which adopts Analytic hierarchy Process (AHP) methodology, is developed into a four level hierarchy (goal, criteria, sub-criteria, and alternatives) representing different aspects of information security policy. A survey based on AHP methodology was conducted to obtain decision maker preferences. Instead of relying on dedicated AHP software, we prefer to clearly demonstrate the process of AHP calculations by using Open Office Calc in data analysis. The aims are to show the applicability of open source software in handling AHP decision making problem and to help decision makers in understanding AHP data analysis procedures without relying on proprietary software. Results show that decision makers prefer availability of information security as highest priority, followed by confidentiality and integrity. The findings reflect future strategy in order to improve the effectiveness of information security policy in the organization. © 2010 Academy Publisher. Source


Arsyad M.,State Polytechnic of Ujung Pandang | Wardana I.N.G.,Brawijaya University | Irawan Y.S.,Brawijaya University
Revista Materia | Year: 2015

The objective of this study was to determine the effect of chemical treatment on the coconut fiber surface morphology. This study is divided into three stages, preparation of materials, treatment and testing of coconut fiber. The first treatment is coconut fiber soaked in a solution of NaOH for 3 hours with concentration, respectively 5%, 10%, 15%, and 20%. The second treatment is coconut fiber soaked in KMnO4solution with a concentration of 0.25%, 0.5%, 0.75%, and 1% for 3 hours. The third treatment is coconut fiber is soaked in H2O2solution with a concentration of 5%, 10%, 15%, and 20% for 3 hours. At each treatment the fiber is dried in an oven at a temperature of 90oC for 5 hours. Coconut fibers that had been the first, second, and third treated, sorted out for chemical composition, single fiber tensile and SEM testing. Tensile strength of single coconut fiber was tested following ASTM 3379-02 by using a tensile testing LR10K Plus 10 kN Universal Materials Testing Machine. The fiber surface morphology was examined using electron microscopy Vega3 Tescan Scanning Electron Microscope (SEM) at 5kV voltage, and X-ray diffraction, 30 kV, 15 mA, at scan speed 2.000 deg./min. The result shows that the highest tensile strength of the fiber obtained in the first treatment namely N4. In general the mechanical strength of the fiber decrease slightly however, the fiber surface morphology becomes rough. NaOH treatments cause crystallization on the surface of the fiber. Crystallinity index was decreased with increasing concentration of NaOH. The second treatment caused the trench grooves on the surface of the fiber that can improve bonding between fiber and matrix. © 2015, Universidade Federal do Rio de Janeiro. All rights reserved. Source


Sirmayanti S.,State Polytechnic of Ujung Pandang | Faulkner M.,Victoria University of Melbourne
Proceeding - 2014 Makassar International Conference on Electrical Engineering and Informatics, MICEEI 2014 | Year: 2014

This paper studies Sigma-Delta (ΣΔ) technique to embed a complex modulation scheme such as orthogonal frequency division multiplexing (OFDM) into a single 'on'-'off' bit stream operating at the carrier frequency. The amplitude of the signal is related to the pulse widths and the phase to the pulse position. This paper concentrates on all digital up-converter structures of ΣΔ modulator architecture. The binary nature of their output removes the need for analog components in the up-conversion chain. Their outputs can be used directly to drive the switch mode power amplifier (SMPA) for high efficiency operation. © 2014 IEEE. Source


Arsyad M.,State Polytechnic of Ujung Pandang | Wardana I.,Brawijaya University | Pratikto P.,Brawijaya University | Irawan Y.S.,Brawijaya University
International Journal of Applied Engineering Research | Year: 2015

The purpose of this study was to determine the behavior of the bonding ability of coconut fiber against polyester matrix with chemical treatment. First treatments, coconut fiber was soaked into NaOH solution, the second into KMnO4 solution and the third into H2O2 solution, each at various concentration for 3 hours. Between each treatment, the fibre was dried at temperature of 90C for 5 hours. The ability of fiber and matrix adhesion was tested with embed of a single fiber as deep as 2 mm. The results show that the chemical treatment causes the fiber surface becomes rough, forming pores or grooves. The highest average interfacial shear stress is obtained in the H2 treatment, because of the rough fiber surface and small grooveds so that when the fibers were implanted into the matrix, the matrix has a strong grip resulting in a good bonding between the fibers with the matrix. While the fiber highest average tensile stress was obtained in N4 treatment, because fiber was draped by small crystals which are unified so that it increase the ability of the fiber receives a tensile load and slow fiber rupture. © Research India Publications. Source


Shiddiq Yunus A.M.,State Polytechnic of Ujung Pandang | Wahyudi S.,State Polytechnic of Ujung Pandang | Abadi S.,State Polytechnic of Ujung Pandang
International Journal of Applied Engineering Research | Year: 2015

The penetration of wind turbine into the existing grid is increased during the past decades. The direct-drive variable speed, Full Converter Wind Energy Conversion System (FCWECS) was taking about 3500 Units of the whole installed wind turbines in 2014. In this paper, Superconducting Magnetic Energy Storage (SMES) Unit based on Hysteresis Current Control and Fuzzy Logic Control is applied to improve the performance of the system with FCWECS and compared to the system with generic model of D-STATCOM. The simulation was carried out using MATLAB/SIMULINK to verify the model under study. From the simulation results, it is obviously described that the performance of the system with FCWECS is much more improved with SMES Unit compared with the system with D-STATCOM. © Research India Publications. Source

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