Zahir Zainuddin

E-lerning concept design of rijndael encryption process

In the subject of Computer Security, there is a learning topic about cryptography. Numbers of meeting for the subject do not enable students to learn the cryptography algorithm that make the students do not fully understand about the working way of some cryptography algorithms. There are many cryptography algorithms. However, only rijndael encryption algorithm will be described in this writing. Rijndael algorithm is chosen because it is considered difficult to solve. The reason is because its process is also difficult to perform. Generally, not all students can understand the encryption process by only reading books. Therefore, it is clear that an application which provides rijndael algorithm learning concept by presenting the input is needed, so the students can clearly get the point in every process occurred in that algorithm.

Modelling of child psychology tests based game learning

Issues that will be described in this study is on how to model a paper test of psychological test into a game that is based on game learning in order to ease psychiatrists and parents in understanding the childrens psychological condition. By playing that game, children will unconsciously learn about social affairs while theirs level of social intelligence are also being tested in the same time. Based on the study, it is clearly known about childrens attractiveness and easiness in completing psychological test using the game learning.

Design analysis of ceramic and polymer 150 kV insulators for tropical condition using quickfield software

This research is to analyze design of ceramic and polymer 150 kV insulators for the tropical area. The use of an insulator certainly requires an electric field. The leakage current and breakdown voltage this happens the contaminant on the surface of the insulator. This type of contaminant can be rain, dust, salt air, extreme weather (much in tropical climates), industrial pollutants and cracks on the surface resulting in collisions. The method used in this research is magnetic field and electric field isolator using Quicfield software. To get the test results variation ranges 20 kV, 70 kV and 150 kV. Side effects of magnetic and electric fields around the insulator. The simulation results show the accumulated contaminants on the surface. Planning should be done in insulator insulator on unstable insulator. Thus, the approach using this commercially available software can be applied to. Therefore, the development of further simulations on the different types of composite insulators used on.

Design a smart waste bin for smart waste management

In this paper, we presented the smart waste-bin that can managed the waste in a smart city project. The system consist of sensors to measure the weight of waste and the level of waste inside the bin. The system also adapt with network environment, to manage all information from waste management. As the result we proposed a prototype of smart waste-bin that suitable for many kind of conventional waste-bin.

Water level monitoring using ultrasonic-pipe in open channel

The authors proposed a method for measuring the water level in open channel which is accurate, low cost, and simple. Getting the accurate measurement in open channel is more difficult than in closed channel because there is an influence of external factors such as the formation of the wave, irregular channel structures and floating objects on the water surface. To resolve those problems, a new sensor device is proposed that can measure the water level accurately and simply. The device consists of a combination of JSN-SR04T ultrasonic sensors and iron pipe, it is developed by using ATMEGA328 microcontroller system. The device can measure the water level changes accurately because in a state of stationary and flat. The comparison result between measuring visually and JSN-SR04T ultrasonic sensor is included. This device can record the results of sensor measurements in every second into the SD-card for the purpose of further analysis.

Performance analysis of interconnection sistem of SulselBarTeng using unified power flow controller (UPFC)

The operation PLTU Jeneponto 2×125 MW and PLTU Barru 2×50 MW, as well as the transmission line of middle lane that connects GI Sidrap - GI Maros - GI Sungguminasa, is the right solution to overcome weaknesses Sulselbar system that is the bottle neck. The entry of PLTA Poso 2 with power capacity 3×65MW into the power system of south of West Sulawesi (Sulselbar) through the GI Palopo, then the system of SulselBar is in a state surplus of power and develop into a sulselBarTeng (south western and central Sulawesi) system. This situation makes PLN as a manufacturer of electric energy, optimizing the operation of the plant in the system, where plants with fuel largely deactivated and plants with low operating costs in maximized Plant operation optimization policy, of course, would affect the distribution of power in certain plants with a fairly long distance line, so that power losses in line and voltage drop on certain buses can not be avoided. This research analyzes the performance of interonnection system of SulselBarTeng by placing a unified power flow controller (UPFC) on one of the transmission line, where the analysis method is done through simulation using NEPLAN software. Simulation results are obtained without UPFC showed reactive power losses are very large, the voltage drop occurs on the bus latuppa (28) 275 kV. The results of the simulation by placing UPFC on line 13-26 shows that the performance of the system increases, power losses decreased, the voltage on the bus latuppa (28) increases and generating capacity also increased.

Modelling and numerical simulation of multiple one way gearswave energy converter to generate electricity

An ocean wave energy converter which uses multiple oneway gears combined with mooringbuoys and counter weight mechanism for producing continuous unidirectional rotation to generate electricity was studied by modelling and numerical simulation. The studied concept consists of more then one moored buoys using chain on oneway gears combined with counter weight mass which uses to keep the chain stright. These convert instantaneous power of incoming wave power and drive electric generator coupled with unidirectional rotating shaft. Mathematical model describing the vertical oscillation of the ocean wave energy converter is presented. Mathematical analysis and modelling shows that utilization of oneway gears connected to rotating shaft are able to rotate unidirectionally. Energy conversion resembles the full wave rectifier principles in power electronics that maximize yielded energy from sea wave. The Mathematical model derived from a series of analysis was utilised to carry out computer simulation using matlab software package. Simulation result showed that wave height variation gave significant influence on harvested energy from sea wave.