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INDONESIA
Majalah Forum Teknik UGM
Published by Universitas Gadjah Mada
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
Arjuna Subject : -
Articles 8 Documents
 1 
Search results for , issue "Vol 33, No 2 (2010)" : 8 Documents clear
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.
Kinetika Adsorpsi Phenol Dalam Air Dengan Arang Tempurung Kelapa Panut Mulyono; Wisnu Madha Kusuma
Forum Teknik Vol 33, No 2 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Abstract Phenol  is  a hazardous  chemical  which  usually  contained  in  the  wastewater  from  some industries, such as oil refineries, coal processing, and plastics. Phenol is dangerous substance to a microorganism although in low concentration in wastewater. According to the United State Environmental  Protection  Agency,  the  maximum  concentration of  phenol  in wastewater  is  1 ppm.  This  requirement  is  lower  than  the  concentration  of  phenol  in  normal  wastewater discharged from industries that is 100 to 1000 ppm. One of the most efficient practical method to remove phenol in waste water is adsorption. Many adsorbent can be used to adsorp phenol from waste water. In this study, coconut shell charcoal is used as the adsorbent. The adsorption kinetics of phenol in aqueous solution was studied by measuring the concentration of remaining phenol in the solution as a function of time (t) with the parameters of operation temperature (T), particle diameter of coconut shell charcoal (d), and mass ratio of coconut shell charcoal to the solution (r). The adsorption rate was found to be increased as the operation temperature and mass ratio increase, but it was decreased as the particle diameter increase. The empirical rate expression for the adsorption of phenol in aqueous solution with coconut shell charcoal has been determined as: 0,438 0,1313 1/2 0 2497,83 ln 1,4832exp C d r t C RT − ⎡ ⎤ − ⎛ ⎞ =− ⎜ ⎟ ⎢ ⎥ ⎝ ⎠ ⎣ ⎦ with the relative mean error of 30.74%. C in this equation is the phenol concentration at time t, C 0 is the concentration at t = 0, and R is the gas constant (8.314 J/mol/K). This equation is valid for the ranges of T of 303 to 333 K, d of 767 to 1879 μm, and r of 0.0476 to 0.1666, and for  the  adsorption  of  phenol  in  aqueous  solution  with  coconut  shell  charcoal  in  erlenmeyer agitated by using shaker bath.  Keywords: Adsorption Kinetics, Phenol, Aqueous Solution, Coconut Shell Charcoal
Perbandingan Metode Rasional Dengan Kreatif Untuk Mendesain Alat Bantu Pasang Lampu Rudy Firman Prakosa; Alva Edy Tontowi
Forum Teknik Vol 33, No 2 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Abstract This article discusses the result comparison of design process of lamp installation device using rational and creative methods and its usability analysis. The study was conducted through team recruitment, prototype development, prototype selection, and usability testing. The teams recruited involved creative team (K-team) consisting of experienced technical expert and non-exact  students,  and  rational  team  (R-Team)  consisting  of  exact  students  with  knowledge  in product design method. Result of prototype selection using weighted objectives method showedthat  rational prototype  produced  higher  total  weight  compared  to  that  of  creative  prototype. Usability  testing  were  also  conducted  in  terms  of  rational  and  creative  prototype  methods. Usability  testing  involved  learnability,  error,  efficiency  of  use,  and  satisfaction.  Result  of usability testing showed that rational prototype had higher efficiency of use, lower error, and higher  satisfaction  level.  Therefore,  rational  method  becomes  better  design  process  in  lamp installation device.  Keywords: product design, creative method, rational method, usability, device

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