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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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Pengaruh Parameter Number Of Excitation (NEX) Terhadap SNR Dwi Rochmayanti; Thomas Sri Widodo; Indah Soesanti
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

This research aims to observe the influence of Number of Excitation (NEX) to bothparameters the Signal to Noise Ratio (SNR) and the scanning time when performing the MRneck . Some MR scan parameters (TR, TE, FOV, slice thickness, matrix, flip angle andbandwidth) are strictly under controlled. All SNR data, due to the 6 NEX variations (NEX 1 toNEX 6), are required by comparing the ROI’s intensity between the noise background and theareas of corpus and spinal cord on the images. The scan times are also recorded for each of theNEX variations being observed. In conclusion, increasing NEX values will simultaneously risethe SNR and the scanning time.Keywords : NEX, SNR, Image MRI, Scan time
Rancang Bangun Sistem Pengukur Curah Hujan Jarak-Jauh Real Time Sebagai Peringatan Banjir Lahar Dingin Sunarno Sunarno
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

The aim of this research is to set up a sufficient system, which is used for real-time raingauge telemonitoring as the early warning system for cold lava avalanche of Mount Merapi.The system contains a remote station (transducer, Counter Timer, CPM Frequency Converter,FSK Modulator, and Tx/Rx) and a controller station (Tx/Rx, FSK demodulator, and personalcomputer).Data managements which are developed in this research are expected to be used in a realtime a rain gauge telemonitoring of Mount Merapi. The characteristics of data communicationin this system are unguided type with air as the media, asynchronous serial mode, simplex modetransmission, with audio modulation and frequency shift keying modulation. A pair of handy-transceiver was use in data transmitting with VHF/UHF wave at Amateur Radio DataFrequency (144,100 MHz and 431,125 MHz). Rainfall data changes 60 ml in 10 seconds wassent with the variation of sound frequency, started at 645 Hz with delay time 0.0168 seconds upto 2.993 Hz with delay time 0,0015 seconds.This research is expected to give valuable information for the telemonitoring systemengineering development, especially for engineers who work in the field of telemonitoringsystem and for the people who live in the Mount Merapi surroundingKeywords: telemonitoring, rain gauge, FSK, modulation
Analisis Pengaruh Proses Brazing Kuningan Terhadap Perubahan Sifat Mekanis dari Pipa Baja Karbon Rendah Mardiana Mardiana; Djoko W. Karmiadji
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Low carbon steel has suitable physical properties such as: easily to be casted, welded andmachined. Generally, this steel is used for construction, hospital and house hold equipment, andso on. Some equipment structures employ low carbon steel pipe for basic construction, in whicha lot of brazing joins are applied for connecting each pipe to form a house hold or hospitalequipment. This research analyzes the brazing methode, since it is commonly used to obtainsmoother joint surface compared with the other method and having lower melting temperaturethan the pipe. The analysis emphasizes the transformation of mechanical characteristics suchas: tensile strength, hardness, micro and macro structures. The result of this research showsthat the maximum tensile strength is 509 N/mm2 when the welded groove is 0,5 mm, or 2,35%greater than welded metal strength, and 12,5% less than base metal strength. The hardnessvalues are decreasing compared with the base metal, i.e., 18,5% of average, 18,57% at HAZ(Heat Afffected Zone), and 19,81% of pipe metal under the value of base metal.Kata kunci: Brazing, pipa baja karbon rendah, sifat mekanis
Karakteristik Menara Pendingin dengan Bahan Isian Ijuk Susanto Johanes
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

In this study the characteristic of a water cooling tower by using the palm fibre as thepacking material have been investigated experimentally. The experiments were carried out in arectangle glass tower of 81 cm2 cross sectional area and 100 cm height. The packing used wasconstructed of 8 palm-fibre ropes (of about 0,6 cm diameter), zigzag vertically placed above thestainless steel support on the tower bottom. Its type has 28,3.10-4 kg weighs of rope every m3volume of the packing.The experimental results show that the increasing of the water inlet temperature and thepacking height cause the increasing of the tower characteristic. Mean while, the increasing ofthe water/air mass flow rate ratio causes the decreasing of the tower characteristic. The towercharacteristic is as a function of the investigated variables which expressed as:NTU = 3,35.10-3 (m w /m a )-0,995 (Z)0,5050 (T wi )1,1643with the relative error of 5,5%.This equation is valid for the range of variables, as m w /m a which is ranged from 4,46 to9,48, Z which is ranged from 30 to 90 cm, T wi which is ranged from 50 to 60 oC. The meaneffectiveness of the heat transfer were calculated to be 25,9%.Keywords: Cooling tower, characteristic, effectiveness, palm-fibre ropes.
Ektraksi Ciri Citra Termogram Payudara Berbasis Dimensi Fraktal Oky Dwi Nurhayati; Thomas Sri Widodo; Adhi Susanto; Maesadji Tjokronagoro
Forum Teknik Vol 33, No 2 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

AbstractThe primary purpose of infrared thermography is the locating of thermal differences and anomalies.  Infrared thermography can  detect  numerous  conditions  in  which  an  anomaly is characterized by an increase or decrease in surface temperature. In this research, we specifically applied calculation of fractal dimension method to a total of20 thermograms of normal breasts as well as of those in advanced breast cancer. In addition standard  image  pre-processing  were  also  used  to  enhance  the  detection capabilitity.  Severalmethods in image processing which are pre-processing with canny edge detection, thresholding, calculation of fractal dimension use box-counting and Hausdorff dimension.The results of this research are shown that Hausdorff dimension in the normal thermogramshave range value 0,4 – 0,95 smaller than the advanced thermograms which have value more than  1,26.Finally  this  results  show  that  the  difference  of  fractal dimension  can  be  used  todistinguish between normal and advanced thermograms.Keywords: canny edge detection, thresholding, fractal dimension, box-counting, Hausdorff
Pengaruh Pewarnaan Beton Cetak Pada Dinding Serap Sebagai Selubung Bangunan Tinggi Slamet Anambyah; Endang Setyowati
Forum Teknik Vol 33, No 2 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

AbstrakThe use of exterior building materials will indirectly affect the room temperature. Planners are  expected  to  choose  the type  of  building  materials  in  accordance  with  the  climate andbuilding conditions to produce good quality buildings. One alternative is to use absorbing wall as a building envelope. Absorbing wall is a kind of wall made of concrete plate with a certain thickness (in the study used a thick wall as 10 cm) that could reduce heat to not cause thermal effects on the environment and on the exterior of the building (Frick, 1998). To support the appearance and aesthetics of the building the walls absorb has coloured. Coloring the wall will affect the absorben surface of the wall to ward heat and indirectly affect the room temperature.Besides, the wall thickness and duration of heating also influence.The research method used was an experiment in the laboratory. Observations were madeby measuring temperature in the room which is divided into four stages of observation, of eachwithin 1.5 hours, six hours and one hour.The results showed that the walls absorb the color produced in the room temperature is higher than the outer space with a difference in temperature between 2-60 Celsius. This is due partly because the space is measured is a sealed space, no change of air in the morning and night, so  hot  that occurred  during  the  day  generated  by  the exterior  wall confined  in  the building. According to the standard of comfort at room temperature, the use of absorbtive wallcolor in these experiments included in the category uncomfortable.Keywords: absorbing wall color, building temperature, heat confined
Pengaruh Functionality Terhadap Kesuksesan Produk Fitri Trapsilawati; Subagyo .
Forum Teknik Vol 33, No 2 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

AbstractThis study was done for analyzing relation between product functionality and success of a product. Product functionality data of 58 different products were used in this study. The data of products were taken from different types of industry, i.e.: automotive, telecommunication, electronic and service. The result showed that the relation between product functionality andsuccess of a product tends to form “must-be” type of Kano diagram. Therefore, in designing a product, producers should not add more “value” in functionality.Keywords: functionality, Kano diagram, success of a product.
Perancangan Aplikasi Sistem Seminar Online Berbasis Internet M Mingsep; Lukito E Nugroho; Jazi E Istiyanto; Risanuri Hidayat
Forum Teknik Vol 33, No 2 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

AbstractOnline seminar system is a real time communication application service used to organizes scientific conference in Internet. The online seminar system application can support text communication, face-to-face communication, dialogue-based communication, and sharing seminar material presentation. The design of the online seminar system application program consists of three parts, which are a server application program, a moderator application program and a client application program.The importance of the real time communication in organizing online seminar system is its capality to create virtual environment (Internet) as a replication of real world communication, because it supports text communication, file presentation, face-to-face communication anddirect dialogue between participants. The face-to-face communication and direct dialogue can create a dynamic interaction environment, because participants can interact face-to-face, directly talk to each other, obtain feedback, present physical reaction of other participants, and chatting using text communication. It become a solution to the problem of distance and time for meeting activities of two or more individuals using internet.The result of the research is a class diagram design that contains group functions and rules/processes necessary in communication. The classes formed in the class diagram design are directly used as object classes at implementation level in the form of online seminar application program code.Keywords: Online seminar system, Real time communication, video conference application design.
Analisis Komputasi pada Segmentasi Citra Medis Adaptif Berbasis Logika Fuzzy Teroptimasi Indah Soesanti; Adhi Susanto; Thomas Sri Widodo; Maesadji Tjokronegoro
Forum Teknik Vol 33, No 2 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Abstract The objective of this research is to analyze the computation of medical image adaptive segmentation based on optimized fuzzy logic. The success of the image analysis system depends on the quality of the segmentation. The image segmentation is separating the image into regions that are meaningful for a given purpose. In this research, the Fuzzy C-Means (FCM) algorithm with spatial information is presented to segment Magnetic Resonance Imaging (MRI) medical images. The FCM clustering utilizes the distance between pixels and cluster centers in the spectral domain to compute the membership function. The pixels of an object in image are highly correlated, and this spatial information is an important characteristic that can be used to aid their labeling. This scheme greatly reduces the effect of noise. The FCM method successfully classifies the brain MRI images into five clusters. This technique is therefore a powerful method in computation for noisy image segmentation. Keywords: computation analysis, MRI Medical image, adaptive image segmentation, fuzzy c-means
Pengaruh Kompaksi dan Kandungan Grafit Terhadap Karakteristik Mekanis Bantalan Luncur Connecting Rod Ali Medi; Djoko W Karmiadji
Forum Teknik Vol 33, No 2 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

AbstractBearing is an important component in the automotive industry that is needed to be made of material having good properties. Aluminum graphite matrix composite becomes a selected tribology application in self-lubricating bearing. This composite has good wear resistance andlow density compared with bronze bearing material so that gives more economical values. This research is done by the method of powder metallurgy with aluminum matrix composite material using an additive of 5% graphite weight fraction. Variable compactions (P) are 400 MPa, 500MPa, 600 MPa and sintering temperature is 5500C, with variable holding times (HT) 1 hour, 2 hours and 3 hours. The study aims to analyze the effect of graphite content affecting the mechanical properties of aluminum graphite composite material. The test results show that the optimum condition of 5% graphite content is the density = 5.11 gr/cm3, the hardness = 54.449 HB, the compressive strength = 790 MPa, when P = 600 MPa and HT = 3 hours.Keywords: aluminium, komposit, serbuk, kompaksi, holding time.

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