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INDONESIA
Majalah Forum Teknik UGM
Published by Universitas Gadjah Mada
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
Arjuna Subject : -
Articles 74 Documents
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Ontologi Sistem Penilaian E-Learning Berbasis Kompetensi Desi Windisari; Sri Suning Kusumawardani; P. Insap Santosa
Forum Teknik Vol 34, No 1 (2011)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Automation grading on e-Learning assessment helps educators in assessing the results of the exam. In a previous research, automation grading vaue jus in the form of numbers, not performed a review the achievement of competency standards. In this research we developed assessment system ontology design fo e-learning base competence. This propose ontology design models the relation between matter and competence then made the rule for the calculation of achievement students against each competency and make recommendations to the student passing the exam. From the test results with the protege show that ontology design can grade the assessment and give recommendations to the student passing the exam, in accordance with the rules made.Keywords : Ontology, assessment e-Learning, Automation grading.
Ekstraksi Ciri dan Identifikasi Citra Otak MRI Berbasis Eigenbrain Image Indah Soesanti; Adhi Susanto; Thomas Sri Widodo; Maesadji Tjokronagoro
Forum Teknik Vol 34, No 1 (2011)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

In this research, we exctract and identify MRI brain images based on eigbrain image.  MRI barain images are used to be input for feature exctraction and identitication. Feature exctraction is done by using the eigbrain image. For all reference image, we find image mean and eigbrain image, and the results are stored. If there is test image, we will find the nearest distance of eigenbrain between test image and reference images. The feature extraction is used to identify the image is whether the normal brain image or the brain image with tumor.The results show that the method successfully classifies MRI images into tree clusters: normal,  glioma, and metastase. The input test images can be identified accurately 100% for image  sizes from 256 x 256 pixels to 64 x 64 pixels.Keywords : feature extraction, image identification, MRI medical image, eigenbrain image.
Performa Mesin Sepeda Motor Empat Langkah Berbahan Bakar Premium dan Pertamax FX. Sukidjo
Forum Teknik Vol 34, No 1 (2011)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

     The Republic of Indonesian government proposes the owners of  private vehicle in order to use pertamax as fuel. Premium will be consumpted specially for the  public transportation. Therefore it is required research how the effect of fuel used to the engine performance.      This research has used a matic motor cycle engine as testing material. This vehicle is used because matic vehicle are large applicated as private transportation. Data which are required as performance of the engine, involve power and torsion, rate of fuel consumption, temperature of cylinder head cover and emission of the axhausted gas.     Based on the anaysis of the data, can be concluded that type of the fuel affects to the engine which consumpted pertamax are higher than engine which consumpted premium. Rate of premium consumption is larger than rate of pertamax consumptionKeywords : engine performance, oil fuel, emision.
Komparasi Karakteristik Menara Pendingin Menggunakan Beberapa Tipe Susunan Pipa-pipa sebagai Pendistribusi Cairan Susanto Johanes
Forum Teknik Vol 34, No 1 (2011)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

     The aims of the experiments are to characterize of the cooling tower by using the bank of the pipes as the fluid distributor. The cooling tower is constructed by rectangle of glasses which it has 9 cm x 9 cm in cross section and 100 cm in height. The fluid distributors are constructed by pipes in 5/8 inch of nominal diameter. There were five types of the packing namely the fluid distributor without baffle, fluid distributor with one baffle, the fuid distributor with two baffles, the fluid distributor with there baffles and the fluid distributor with four baffles.     The experiment have been done by flowing the hot water from the top of cooling tower through the fuid distributor, on the other hand, the air cooler is flown above through the fluid distributor opposite to the water flow direction. This process makes the exchanging of the heat between air and water on the fluid distributor. The variables varied in this experiments are the inlet water temperature, Twi (45, 50, 55 and 60 °C), the height of fluid distributor, Z (30.5, 61 and 91.5 mm), the ratio of water/air mass flow, mw/ma (3.624, 5.888 and 7.700) and the number of baffle (without baffle,  one baffle, two baffles, three baffles and four baffles).     The experimental results show that in the ratio of water/air mass flow rate which is lower, the increasing of the numbers baffle cause the decreasing of characteristic. Mean while, in the ratio of water/air mass flow rate which is higer, the increasing of the numbers of baffle cause the increasing of the characteristic. The cooling tower without the fluid distributor has the average characteristic is 13.4% and the average effectiveness is 16.2%. For the cooling tower with the fluid distributor has the average characteristic is 31.5% and the average effectiveness is 25.0%. Keywords : Cooing tower,  characteristic, fluid distributor.

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