cover
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota depok,
Jawa barat
INDONESIA
Makara Journal of Technology
Published by Universitas Indonesia
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Arjuna Subject : -
Articles 8 Documents
Search results for , issue " Vol 14, No 1 (2010)" : 8 Documents clear
Fishing Catch and Catch Rate Assesment of Mini Trawl, Trapnet and Setnet Fisheries Firdaus, Muhammad
Makara Journal of Technology Vol 14, No 1 (2010)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v14i1.172

Abstract

This paper purposed to assessment for fishing catch and catch rate of the dragged gear on shrimp, trapnet and setnet fisheries in Tarakan. Catch and effort data (number and species), fishing time of capture unit, were used in analysis qualitative fishing catch and catch rate to describe catch compotition and catch rate from three unit capture fisheries in Tarakan. The result of research showed that in the operation draged gear on shrimp have two main catch are nomei fish and shrimp. on the their two fishing season. Nomei fish as to be a main catch on the trapnet fisheries and pelagic fishes that estuary and coastal of waters as to be a main catch on the setnet fisheries. Dragged gear on shrimp operation with nomei fish as a main catch have catch rate of value are 16.10 kg/hour and trapnet fisheries are 1.67 kg/hour. Catch rate of value from setnet fisheries are 5.39 kg/day and dragged gear on shrimp operation with shrimp as a main catch have a catch rate of value 2.05 kg/hour.
Ontology-Based Automatic Classification for News Articles in Indonesian Language Basnur, Prajna; Sensuse, Dana
Makara Journal of Technology Vol 14, No 1 (2010)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v14i1.173

Abstract

Searching specific information will be difficult if only rely on query. Choosing less specific queries will result many irrelevant information fetched by the system. One of the most successful way to overcome this problem is to perform document classification based on the topic. There are many methods that can be used to conduct such a document classification, such as statistical and machine learning approaches. However, those document classification methods require training data or learning documents. In this study, the authors attempted to classify documents using a method that doesn’t require learning documents. This classification method uses ontology to classify documents. Document classification by using ontology is done by comparing the value of similarity among documents and existing node in the ontology. A document is classified into a category or a node, if it has the highest similarity value in one of the nodes in the ontology. The results showed that the ontology can be used to perform document classification. Recall value is 97.03%, precision is 91.63%, and f-measure is 94.02%.
A Simple Technique for Surface Area Determination Through Supercritical CO2 Adsorption Sudibandriyo, Mahmud
Makara Journal of Technology Vol 14, No 1 (2010)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v14i1.169

Abstract

The measurement of specific surface area of porous materials has long been important in physical sciences and is currently growing in importance in applied and environmental science. Numerous systems have been developed for surface area measurement by gas adsorption. Commercial systems are available which can measure a wide range of absolute surface area with relative ease. However, their cost is often prohibitive. In this study, an inexpensive apparatus for surface area measurement has been set up to be used for measuring supercritical adsorption of CO2. The Ono-Kondo Lattice model was used to represent the adsorption isotherm and to determine the surface area. The results of surface area determination using CO2 adsorption combined with OK model have been compared to the numbers obtained from nitrogen BET method. For surface area determination of zeolites and activated carbons, the new method give reasonable agreement results (within 10% deviation) compared to the results obtained from nitrogen BET method. In addition, the new method also gives more reasonable results for surface area determination of coals. As known, the nitrogen BET method gives almost zero of coals’ surface area. This might due to the characteristic of the coals’ structure that might be change (the pores are closed) during the cooling process in nitrogen BET method. Moreover, the new method can also be used to determine the surface area of porous materials using CO2 adsorption data at various temperatures without sacrificing their accuracy.
Particle Filter with Binary Gaussian Weighting and Support Vector Machine for Human Pose Interpretation Agustien, Indah; Widyanto, Muhammad Rahmat; Endah, Sukmawati; Basaruddin, Tarzan
Makara Journal of Technology Vol 14, No 1 (2010)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v14i1.174

Abstract

Human pose interpretation using Particle filter with Binary Gaussian Weighting and Support Vector Machine is proposed. In the proposed system, Particle filter is used to track human object, then this human object is skeletonized using thinning algorithm and classified using Support Vector Machine. The classification is to identify human pose, whether a normal or abnormal behavior. Here Particle filter is modified through weight calculation using Gaussiandistribution to reduce the computational time. The modified particle filter consists of four main phases. First, particles are generated to predict target’s location. Second, weight of certain particles is calculated and these particles are used to build Gaussian distribution. Third, weight of all particles is calculated based on Gaussian distribution. Fourth, update particles based on each weight. The modified particle filter could reduce computational time of object tracking since this method does not have to calculate particle’s weight one by one. To calculate weight, the proposed method builds Gaussian distribution and calculates particle’s weight using this distribution. Through experiment using video data taken in front of cashier of convenient store, the proposed method reduced computational time in tracking process until 68.34% in average compare to the conventional one, meanwhile the accuracy of tracking with this new method is comparable with particle filter method i.e. 90.3%. Combination particle filter with binary Gaussian weighting and support vector machine is promising for advanced early crime scene investigation.
Maintenance Activity Planning by Reability Centered Maintenance II Method Hidayat, Rachmad; Ansori, Nachnul; Imron, Ali
Makara Journal of Technology Vol 14, No 1 (2010)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v14i1.170

Abstract

This research discuss maintenance activity by using RCM II method to determine failure function risk at compresor screw. Calculation is given to magnitude optimum time maintenance interval by considering the cost maintenance and the cost reparation. From the research results with RPN points out that critical component that needs to get main priority in give maintenance on compresor screw are bust logistic on timeworn piston, and on filters sponge airs to come out damage that gets RPN 45. Optimum maintenance interval point one that acquired to prevent failure on compresor screw smaller than appreciative MTTF which indicate optimum maintenance interval in avoiding its bust happening logistic component before happening damage.
Petroleum Degradation in Soil by Thermophilic Bacteria with Biopile Reactor Nugroho, Astri; Effendi, Edison; Karonta, Yulius
Makara Journal of Technology Vol 14, No 1 (2010)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v14i1.175

Abstract

Crude oil degradation has been carried out using biopile reactor in TPH concentration of 5%, 10% and 15%. The thermophilic microorganism used from isolation result and identification are Aeromonas salmonicida, Bacillus pantothenticus, and Stenotrophomonas maltophilia. Biodegrade of biopile reactor done by various concentration Total Petroleum Hydrocarbon (TPH), Total Plate Count (TPC), and Volatile Suspended Solid (VSS) per day during 30 day. Biodegrade kinetic parameter calculated are m, mm, Y, Yt, Yobs, Kd, Ks from TPH concentration decision, TPC and VSS in every microorganism with t (observation time) that is 0 hour to 168 hour. Crude oil separation efficiency in a biople reactor shows that the largest separation occurs on a starting TPH concentrate of 15% which was 61.8% later on followed on a starting TPH concentrate of 10% and 5% which was as much as 61% and 48.4%.
Software Design of Mobile Antenna for Auto Satellite Tracking Using Modem Correction and Elevation Azimuth Method Sirat, Djamhari; Asvial, Muhamad; Diponegoro, Arman; Sidharta, Himawan
Makara Journal of Technology Vol 14, No 1 (2010)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v14i1.171

Abstract

Pointing accuracy is an important thing in satellite communication. Because the satellite’s distance to the surface of the earths satellite is so huge, thus 1 degree of pointing error will make the antenna can not send data to satellites. To overcome this, the auto-tracking satellite controller is made. This system uses a microcontroller as the controller, with the GPS as the indicator location of the antenna, digital compass as the beginning of antenna pointing direction, rotary encoder as sensor azimuth and elevation, and modem to see Eb/No signal. The microcontroller use serial communication to read the input. Thus the programming should be focused on in the UART and serial communication software UART. This controller use 2 phase in the process of tracking satellites. Early stages is the method Elevation-Azimuth, where at this stage with input from GPS, Digital Compass, and the position of satellites (both coordinates, and height) that are stored in microcontroller. Controller will calculate the elevation and azimuth angle, then move the antenna according to the antenna azimuth and elevation angle. Next stages is correction modem, where in this stage controller only use modem as the input, and antenna movement is set up to obtain the largest value of Eb/No signal. From the results of the controller operation, there is a change in the value of the original input level from -81.7 dB to -30.2 dB with end of Eb/No value, reaching 5.7 dB.
Ergonomic Analysis of UI’s BicyclesUsing Posture Evaluation Index (PEI) Method in Virtual Environment Muslim, Erlinda; Nurtjahyo, Boy; Zulkarnain, Zulkarnain; Afrinotha, Liza
Makara Journal of Technology Vol 14, No 1 (2010)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v14i1.176

Abstract

This research was conducted to study ergonomic aspect from University of Indonesia bicycle in virtual environment. Software Jack 6.0 was used to analyze it. PEI was used as approach that integrated the results of three methods: Lower Back Analysis, Ovako Working Posture Analysis, and Rapid Upper Limb Assessment. The research objective is to evaluate existing design of University of Indonesia bicycle and to determine the most ergonomic redesign which concern with handlebar height and saddle height modification. The result showed that the most ergonomic design of University of Indonesia bicycle is the one with the highest handlebar height (22 cm) and the lowest saddle height (11 cm).

Page 1 of 1 | Total Record : 8