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bernadeta subandini astuti
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JURNAL TEKNOLOGI TECHNOSCIENTIA
Published by Institut Teknologi Nasional Yogyakarta
ISSN : 19798415     EISSN : 27148025     DOI : https://doi.org/10.34151/technoscientia.v8i2.161
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
JURNAL TEKNOLOGI TECHNOSCIENTIA dengan ISSN: 1979-8415 dan E-ISSN: 2714-8025 merupakan jurnal ilmiah yang diterbitkan LPPM Institut Sains & Teknologi AKPRIND Yogyakarta sebagai wahana publikasi karya ilmiah/penelitian di bidang teknologi atau rekayasa meliputi bidang teknik kimia, teknik industri, teknik mesin, teknik elektro, teknik informatika, teknik geologi, dan teknik lingkungan, terbit dua kali setahun pada setiap bulan Februari dan Agustus. Setiap naskah yang dikirim akan dilakukan review secara tertutup. Hasil review naskah meliputi: DITOLAK atau DITERIMA DENGAN PERBAIKAN atau DITERIMA. Setiap naskah yang dinyatakan DIITERIMA dan DITERBITKAN dikenakan biaya proses dan cetak sebesar Rp. 250.000,- (di luar biaya pengiriman) dikirimkan via transfer ke: Bank Mandiri Cabang Yogyakarta No.: 137-00-1255210-1 an.: Prof. Dr. Ir. Sudarsono, M.T.
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 17 Documents
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Search results for , issue "Technoscientia Vol 2 No 1 Agustus 2009" : 17 Documents clear
ANT-WUM: ALGORITMA BERBASIS ANT COLONY OPTIMIZATION UNTUK WEB USAGE MINING Abdurrahman -; Bambang Riyanto Trilaksono; Rila Mandala; Rajesri Govindaraju
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.67

Abstract

This paper is continuity research from our previous work in Ant-Miner implementation for web user classification. In our previous work, we implemented Ant-Miner algorithm for web user classification same with Ant-Miner for classification task in data mining domain. In this paper, we propose modification of heuristic function of Ant-Miner based on web usage mining (WUM) problem, that we name Ant-WUM. The heuristic function ACO is based on local problem domain. Information theory is common heuristic function used in classification task, such as implemented in C4.5 algorithm and ant-miner algorithm. Ant-WUM uses heuristic function based on closeness principle that implemented in clustering problem in WUM. We propose to use data from web access log, profile user, and transaction data to provide some attributes as term candidate of classification rule by Ant-WUM algorithm. We compared Ant-WUM algorithm with Ant-Miner algorithm. The result indicates that Ant-WUM has competitive result in term of accuracy rate, amount of rules, and computation time.
PERAMALAN KAPASITAS BATERAI PADA KENDARAAN LISTRIK DENGAN METODA COULOMETRI Kaloko, Bambang Sri
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.408

Abstract

This article proposes a new coulometric approach to calculate the state of charge of a lead acid battery in electric vehicles. The main existing state of charge algorithms have two major defects: a state of charge definition not adapted to electric vehicle ap-plications and the nonoptimal use of static performance of the accumulator to estimate its state under dynamic stresses. In order to improve these two weaknesses, we propose a new coulometric algorithm linked to the performance of the electric vehicle and where the ampere hours virtually discharged are obtained by applying statistical equivalence coefficients to the real current profile. The evaluation of this new algorithm on real dis-charges reveals a significant improvement with less than 5% errors in all cases studied.
PENINGKATAN EFEKTIVITAS PENYAJIAN SEARCH RESULT DARI SISTEM TEMU KEMBALI INFORMASI MENGGUNAKAN CLUSTERING DOKUMEN Hamzah, Amir
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.409

Abstract

The fast expansion of text information volume has caused the difficulty of infor-mation retrieval process, mainly on the model of word-based matching. The synonymy factor of word has caused non relevant document to be retrieved, whereas the polisemy factor has caused relevant document not to be retrieved. The application of document clustering to the search results before presented to the user can increase the effect-tiveness of retrieval. This study elaborates the application of document clustering to im-prove the effectiveness of retrieval by clustering to the search result before presented to the user. Three clustering algorithms from partitional approach i.e. K-Means, Bisecting K-Mean and Buckshot, and hierarchical agglomerative approach with two cluster similarity function i.e. UPGMA and Complete Link were chosen. The performance parameter was measured using F-measure, a metric derived from Precision and Recall of retrieval. The document collections to be tested are 1000 news document and 350 academic abstract documents. The results show that the presentation of search results by using clustering has improved the number of relevant document in the up-level ranks. The improvement was statistically significant compare to the page-rank method. The improvement of F-measure as a performance metric is about 14,34% for news documents and 28,18% for abstract documents.
ANALISIS PERLAKUAN PANAS NORMALISING PADA PENGELASAN ARGON TERHADAP SIFAT MEKANIK HASIL LASAN BAJA KARBON RENDAH Widodo, Basuki
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.410

Abstract

Welding is a fabric Welder i.e a fabrication process that applied to joint metal material by using temperature dissociation energy of diatomic. Up to this day, welding has been used widely on joining steel and engine constructions. The influence of thermal cycle on welding causes metallurgical changes i.e residual stress and changes of mechanical characteristics (hardness, strength tensile, reconnaissance of macro and micro structures) on the result of low carbon steel weldment. This research was done to obtain the proper treatment for normalizing weldment result on different current to mechanical character. The value of hardness and strength tensile is best obtained after normalizing process at temperature of 8600C is at the current of 140A with hardness mean value of 78,67 HRB ( weld), 73,89 HRB ( HAZ) and 70,11 HRB ( mains), while strength tensile is 45,835 Kgf/mm2.
PENYELESAIAN ARUS PERALIHAN RANGKAIAN SERI R-L DENGAN TEGANGAN ARUS SEARAH BERBASIS MATLAB Setyowati, Dwi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.411

Abstract

A Case study was taken as a research to investigate the physical process occurred in a simple electric circuit which consists of resistance component R and inductance L with direct voltage source. The general form of series circuit is represented a differential equation of the first order to count the current transfer equation can be found by many methods, they are the first ordered solution, Euler method, the third order Runge-Kutta method, and the fort order Runge-Kutta by using Matlab program. The examinationon by using step measurement with h = 0,05 caused error value to the first order solution method = 2.79%, Euler method = 3.8%, the third order Runge Kutta method = 2.1%, the forth order Runge Kutta method = 2.26%, using step measurement h = 0.1 caused error value to the first order solution = 2.27%, Euler method = 5.23%, the third order Runge Kutta method = 2.27%, the fourth order Runge Kutta method = 1.85% and using step measurement h = 0,15 caused error value to the first order solution = 5.81%, Euler method = 22,35%, the third order Runge Kutta method = 7.19%, the forth order Runge Kutta method = 4.7%.
DEKOMPOSISI TUGAS-TUGAS SOFTWARE-DEFINED RADIO (SDR) Marpanaji, Eko
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.412

Abstract

This paper addresses decomposition of the tasks of Software-Defined Radio (SDR) computation by taking Gaussian Minimum Shift Keying (GMSK) as a case study. The aim of this research was to produce a task graph of the SDR that was needed in scheduling of distributed computing with task parallelism using genetics algorithm. Based on the tasks decomposition and the evaluation of execution time of each task, we obtained a task graph of SDR computation. We conclude that there are eleven tasks for the modulator and fifteen for the demodulator.
PERILAKU KOROSI PADA SAMBUNGAN PLAT PEMBENTUK BODI MOBIL Arbintarso, Ellyawan Setyo
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.413

Abstract

Effect of plate joint on automobile body which susceptible to corrosion has been investigated also corrosion rate on automobile plate when the coating has impacted. Rain and sea water was used as corossion medium as normally affected on automobile plate. Low carbon steel has been choosed as standart plate. The forming of plate as a joint which folding and welding used a standart manufacture of automobile industry. The re-sults have shown the losses weight of plate faster on the sea water environment. After immersed in the sea water for 627 hours the corrosion rate of folding plate joint has 0.000806 mpy, although it was at a standstill outstanding level. Coating paint can decrea-sed 20% corrosion rate, but still need attention to care if the automobile body was impac-ted.
ANALISIS PENGENDALIAN KUALITAS DAN EFEKTIVITAS DENGAN INTEGRASI KONSEP FAILURE MODE & EFFECT ANALYSIS DAN FAULT TREE ANALYSIS SERTA OVERALL EQUIPMENT EFFECTIVENESS Susetyo, Joko
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.414

Abstract

Effective measurement with Overall Equipment Effectiveness (OEE) method and concept of Failure Mode and Effect Analysis (FMEA) and Fault Tree Analysis (FTA) is hoped able to in crease production volume and quality. OEE method is based on three factors, they are: availability, performance and quality. OEE value is got by multiplying the three factors. FMEA concept is carried out to decide the critical rating, evidence, and defection rating. RPN calculation is the result of those three rating multiplication shows the risk level of a failure. FTA concept is carried out by using OR gate to know the probability of failure evidence. The analysis that is got show OEE value of Paper Machine in two year: first year 60%, in crease to 83% in the second year. Cutter Asahi’s OEE value, in the first year, is 67%, in the second year become 73%. The first cause of low OEE is PLN drop power energy. The FMEA result identification is got highest RPN value that is 245 at Paper Machine process, with failure mode dirty, the main cause is dirt that dissolved in its production process and the screen that does not work maximally. To handle that cause needs a routine checking and cleaning in the process and screen by Paper Machine operator. Identification result of FTA indicates that highest failure probability on Paper Machine part is 0.01145.
PENGARUH HASIL-HASL UJIAN DI SEKOLAH TERHADAP HASIL UJIAN NASIONAL DI SMU NEGERI 1 LIMBOTO KABUPATEN GORONTALO -, Noeryanti
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.415

Abstract

The aim of the research is to know whether the result of school examination in-fluences the result of national examination significantly. Observation data was taken from the third year science students of SMUN1 Limboto Gorontalo Regency Gorontalo Pro-vince. The best method to get regression model with unbias estimator is used the least square was done by using classical assumption examination, those are normal, multi-colinier an correlation ones. The result showed that national examination data, mean of Raport, Tryout, School examination marks and Practice examination, fulfill this assum-ption. Base on analysis data, it that in partially, UAN grades are influenced by: Raport grades with MSE=0,004 and R2=45.9%, Tryout grade with MSE= 0.09931 and R2= 59.3%, School grade with MSE=0.235691 and R2=5.8% and Practical grade with MSE=0.09931 dan R2 = 59.3%. Simultantly, UAN grades are influence by: Raport grade= –0.384, Tryout grade=0.848, School grades = –0.303 and Practical grade=0.082. Based on beta coefficient, it can be concluded that mean variable of tryout mark has the most dominant influences to national examination mark. The surtable mathematics model can be stated as Ŷ=4,985+ 0,182(x1)+0,370(x2)–0,261(x3)–0,280(x4)+0,376(lag_Y).
ANALISIS RESISTANSI PENTANAHAN SEBAGAI UPAYA UNTUK ANTISIPASI SAMBARAN PETIR DI DAERAH PERBUKITAN WILAYAH BANTUL Suyanto, Muhammad; Mulyaningsih, Sri
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v2i1.416

Abstract

The aim of this study was to find an information about varying soil resistant along residence area in Bantul Regency. The aim of the study is to compiling fixed grounding system. Factors controlling the grounding are ground resistivity, electrode resistivity, environmental condition, size and shape of the system. Ground resistivity needs a good grounding system, that accomplish to savety standard for people and its equipments. The ground system should be able to prevent dangerous caused by flash, whenever nuisance come out. It parposes to overcoming the current of ground system nuisance of electricity power, in order the power could be flowing to the ground, directly; not to the equipments. The resistivity data resulted from the field work measurements, shows some different va-lues in each place, that probably caused by different kinds of soils. For examples are re-gusol soil has a resistivity value of 22.05Ω, latosol 17.04Ω, and red mediteran 15.12Ω. Grumusol soil has resistivity of 7.8Ω, but after it’s analyzed by grounding with 4 electrode, the value is decrease into 4.22Ω. Those are caused by grumusol soil is clayy, while the other soils are sandy. Based of IEEE recomendation of ground resistivity values, home electricity should be <10Ω, while for flash protection should be < 5Ω. Up to now, the solu-tion for quenching the overload power, in order it’s unable to damage the equipments, it’s flowed to the ground directly.

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