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JURNAL TEKNOLOGI TECHNOSCIENTIA
Published by Institut Teknologi Nasional Yogyakarta
ISSN : 27148025     EISSN : 27148025     DOI : https://doi.org/10.34151/technoscientia
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
Focus and Scope JURNAL TEKNOLOGI TECHNOSCIENTIA sebagai wahana publikasi karya ilmiah/penelitian di bidang teknologi atau rekayasa, meliputi: 1. Teknik Kimia 2. Teknik Industri 3. Teknik Mesin 4. Teknik Elektro 5. Teknik Informatika 6. Teknik Geologi 7. Teknik Lingkungan
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 16 Documents
 1   2 
Search results for , issue "academia ista vol 12 no 01 agustus 2007" : 16 Documents clear
ANALISIS ALIRAN DAYA TIGA FASA DENGAN METODE KOMPENSASI ADAPTIF UNTUK SISTEM DISTRIBUSI DENGAN UNIT PEMBANGKIT YANG TIDAK TERPUSAT Muljono, Agung Budi; Nrartha, I Made Ari
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1970

Abstract

Generally study of power-flow used the system presentation with the well-balan-ced load. Presentation like this enabled to solve power-flow used single phase presen-tation. Well-balanced load distribution system is very rare. Condition of unbalance load on distribution system needed the special power flow program which can solve three phase power system.This research made and tested three phase power-flow program with adaptive compensation-based method using the application program MATLAB 6.5.1. This method emphasized to solve power-flow of radial system with balance or unbalance load and dis-persed generation. Result of research showed for the validation of program using standard data 15 bus that is getting of converged to the specified tolerance value (1x10-8) for the various lo-ading condition. Unbalance load caused the power mismatch at same iteration tend to in-crease in linear. Addition load factor at one of phase (phase A) caused power mismatch at same iteration tend to increase by exponential. Dispersed generation gives decrease voltage drop in most of all buses and decrease power loss until 73,64 %. Unbalance load on Airlangga feeder caused increase system loss until 38,09%. The biggest contributions of loss cause by longest branch feeder on bus 4 to 6 equal to 39,68 %. Biggest voltages drop at the end of feeder with average degradation until 0Ð0,0130 pu for balance and un-balance load.
STUDI KOMPARASI ALGORITMA HIERARCHICAL DAN PARTITIONAL UNTUK CLUSTERING DOKUMEN TEKS BERBAHASA INDONESIA Hamzah, Amir; Susanto, Adhi; Soesianto, F; Istiyanto, Jazi Eko
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1972

Abstract

Text document clustering is a technique which has been intensively studied be-cause of its important role in the text-mining and information retrieval. In the vector spa-ce model it is typically known two main clustering approaches,i.e. hierachical algorithm and partitional algorithm. The hierarchical algorithm produces deterministic result known as a dendogram, but its weakness is high complexity in time and memory. On the other hand, partitiaonal algorithm has linear time and memory complexity although its clustering result is not independent from its initial cluster. The aim of this research was to study experimentally to compare the perfor-mances of several techniques of hierarchical algorithms and partitional algorithms applied to text documents written in Bahasa Indonesia. The five similarity techniques i.e. UPGM-A, CSI, IST,SL and CL were chosen from hierarchical, whereas K-Means, Bisecting K-Mean and Buckshot are chosen for partitonal ones. The documents were collected from 200 to 800 Indonesian news text that have been categorized manually and used to test these algorithms using F-measure for clustering performance. This value was derived from Recall and Precision and can be used to measure the performance of the algorithms to correctly classify the collections. Results showed that Bisecting K-Mean as a variant of partitional algorithm performed comparably with the two best hierarchical techniques,i.e. UPGMA and CL but with much lower time complexity.
GERAKAN TANAH DI KARANGSAMBUNG, PENYEBAB DAN ANTISIPASI PENCEGAHANNYA Mustofa Nur, Arief
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1975

Abstract

Land movement or better known as landslide represents one of the geologic ha-zard often occur in Indonesia including Karangsambung. Landslide basically occurs as a result of slope instability. The aim of this researh was to study factors affecting land mo-vement. The objective of this study was to determine anticipatory steps that can be per-formed by the community itself. The method used was by observation and morphological analysis of the land movement, geological aspect, hidrological aspect, and aspect of landuse. Based on the observed data and literature study, there are two types of landslide movement in Karangsambung area, i.e. creep type at small slope (3°-5°) and slump type at high slope (60°). The mechanism causing land movement in the research location is estimated to be clays that is thick enough to join each others at bedrock in the form of claystone Karangsambung Formation having the character of waterproof. Existence of o-ther factors such as inclination of slope and hidrology progressively trigger the land mo-vement. This condition caused trigger force bigger than supported force, so that the land easier to move. Anticipatory steps that can be done are by closing cracking land, preventing sur-face water enter into land movement area, making stone bagwark and bamboo, and also the people are advised to set aside to safer places if heavy rain comes.
APLIKASI SISTEM CERDAS SEBAGAI PENENTU KEBIJAKAN MANAJEMEN RESIKO SISTEM KETENAGALISTRIKAN Kaloko, Bambang Sri
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1976

Abstract

An electricity based on artificial intelligence has been developed for producing a cheap, simple, and reliable electricity method. The comparison of reability value and availability value of old method that applied now in Buduran Substation with a new expert system method has been tested. The evaluation of change of reability value and availability value of a new expert system method showed a value <10%. It is concluded that this method is acceptable. The decreasing of reability value and availability value of new method can be used for the maintening of equipment.
THE INVESTIGATION ORE DEPOSIT OF RADIOISOTOPE ELEMENT WITHIN THE MINING SUBSTANCE IN THE WEST TIMOR ISLAND NUSA TENGGARA TIMUR Pasangka, Bartholomeus; -, Prayoto; Brotopuspito, Kirbani Sri; -, Waluyo
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1977

Abstract

These research inspect the distribution and the accumulation shape of ore depo-sit anomaly of radioisotope element within the mining substance at Sub-district of Amara-si and East – Middle Kupang West Timor Island. The aims of the research: 1) to localize the distribution wide of radioisotope element within the mining substance, 2) to stake out the target reconstruction or shape of accumulation anomaly ore deposit of radioisotope e-lement within the mining substance, 3) to decide counts range of nuclear radiation and thermal counts in the center region of radioisotope source in the West Timor Island. The methods of research consist of: observation, survey, modeling, analysis, and interpretation. Procedures of research including: 1) to observe for determination the po-tential region and grid plot, 2) to calibrate equipment, 3) to measure background count in around of survey location, 4) to measure nuclear radiation and thermal count in the sur-vey location, 5) to correct field count with background count, 6) two and three dimensional characteristic curve of radiation and thermal count plot, contour, contour slice, and distri-bution profile curve of ore deposit anomaly of radioisotope in the mining substance al-so plot, 7) to determine the depth of ore deposit of radioisotope element within the mi-ning substance and radiation power, 8) to calculate radiation intensity for modeling of tar-get reconstruction, 9) to stake out modeling and target reconstruction of ore deposit of ra-dioisotope in the mining substance, 10) interpretation and conclusion. The results of the research: radiation power to determine radiation intensity is 1183911,452 w. Based on characteristic curve, contour, profile curve, and modeling of o-re deposit anomaly (target reconstruction) of radioisotope element within the mining subs-tance, can be proposed that the wide of ore deposit distribution of radioisotope element in rock mineral 1.5 kilometers x 2.0 kilometers, and the wide of ore deposit center region 200 meters x 300 meters. The shape of ore deposit anomaly of radioisotope element wi-thin the mining substance resemble of oval ball vertically with diameters ± 54 meters hori-zontal, and ± 100 meters vertical on the average depth 22 meters, and the shape on abo-ve surface is dented. The range thermal and radiation counts of radioisotope element in the mining substance revolve between 20.3o C to 50.7o C and 9 counts per minute to 117 counts per minute.
PENGARUH VISKOSITAS TERHADAP DISTRIBUSI TEKANAN RADIAL PADA ALIRAN DI ANTARA DUA SILINDER KONSENTRIS VERTIKAL -, Basyirun
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1980

Abstract

This research is conducted to know pressure distribution in the gap between the cylinder as function of R (flow radius) caused by velocity gradient on inside cylinder. Be-side, it is conducted to show the influence of viscosity pressure distribution in the gap cy-linders.This research is carried out in two concentric cylinders of 200 mm high. The in-side cylinder is rotated and the outer is fixed. The clearance of the cylinder is 10 mm. The fluid with varying viscosity (m1=9,86.10-5 kg/m.det.; m2=10,036.10-5 kg/m.det; m3=15,283.10-5 kg/m.det; m4=27.40.10-5 kg/m.det.) is filled into the gap. The inside cylinder is driven by a DC motor connected to a motor speed controller. The pressure is measured at the lower of the gap with three point in difference radius. The result show that the pressure in the gap of cylinder tends to decrease under atmospheric pressure. The highest decreasing tendency of pressure is near to the mea-surement point at inside cylinder. The result of the experiment shows that it has the sa-me phenomenon with theory, although there is a difference quantitatively.
EVALUASI PELAYANAN KUALITAS AGENCY BANK “X” DI SURABAYA Nurmianto, Eko; Trisunarno, Lantip; Sudjono, Hary
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1982

Abstract

Research objective is to determine difference between customer’s expectation towards service quality and management perception on customer expectation. Research advantages (1) to obtain clear information on customers’ expectation and perception as well as to improve its service quality, and (2) to know the problem inside the agency. Methodology Customer Questionnaires consist of 4 parts, Part I: 8 qualitatif question (customer demography), Part II : 17 Customer Perception Questions, Part III : 17 Customer Expectation Questions, Part IV: Open Question for Weighted Importance of 5 SERVQUAL dimension. Management Questionnaires consist of 3 parts, Part I : 4 questions (management demography and working duration), Part II : 17 customer perception questions, management on customer expectation towards service execution, Part III : Open Question for Weighted Importance of 5 SERVQUAL dimension. Data Analysis Methodology: Descriptive, Cluster, Discriminant, and Dependency Analysis, SERVQUAL Analisis on Gap 5 and Gap 1. Results : Gap 1 cluster 1 require improvement on variable 5 (service always free from errors), for cluster 2 on variable 10 (if error occur then agency would fix). Gap 5 cluster 1 needs improvement variable 5 (service always free from errors), variable 8 (service always suit to the promises), variable 9 (customer complaint would be honestly responsed), and variable 11 (hospitality of agency Bank staff), for cluster 2 on variable 17 (sympathy agency staff). Based on Importance-Performance Graph, variable which is need to be fixed on cluster 1 is variable 8 (service always suit to the promises). Cluster 2 variable which is need is variable 8 (service always suit to the promises) and variable 10 ((if error occur then agency would fix).
PENGGUNAAN MULTISTAGE FILTER ADAPTIVE WIENER UNTUK MENINGKATKAN KUALITAS CITRA DIGITAL Utaminingrum, Fitri; Prijono, Wahyu Adi
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1983

Abstract

One way to enhance the quality of digital image from gaussian noise disturbance is trough a combined Adaptive Filter and Wiener one. This then called the Adaptive Wi-ener Filter is capable of estimating the noise, first by finding the adaptation parameters mean and variance calculated from the noisy image data.The Adaptive Wiener Filter performs better in a multistage scheme, so that higher resulting signal to noise ratio can be achieved. The associated analysis and evaluation is based on the corresponding MSE (Mean Square Error) and PSNR (Peak to Signal Noise Ratio) for comparing with those obtained the comman Median Filter and Average Filter.With two representative digital images used, which are black and white and color, respec-tively, the results show significant of MSE of 0.0029562 and 0.0010456 for low noise of variance 0.001, 0.0093262 and 0.0022968 for higher noise of variance 0,035 and in-crement of PSNR of 73.4235 and 77.9335 for the same low noise and of 68.4338 and 74.5195 the same higher noise, due to the multistaging scheme.
MATHEMATICAL MODELING FOR THE EXTRACTION OF URANIUM AND MOLYBDENUM WITH EMULSION LIQUID MEMBRANE, INCLUDING INDUSTRIAL APPLICATION AND COST EVALUATION OF THE URANIUM RECOVERY Basuki, Kris Tri
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1985

Abstract

Emulsion liquid membrane systems are double emulsion drops. Two immiscible phases are separated by a third phase which is immiscible with the other two phases. The liquid membrane systems were classified into two types: (1) carrier mediated mass transfer, (2) mass transfer without any reaction involved. Uranium extraction, molyb-denum extraction and solvent extraction were used as purposed elements for each type of the membrane systems in the derivation of their mathematical models. Mass transfer in emulsion liquid membrane (ELM) systems has been modeled by several differential and algebraic equations. The models take into account the following : mass transfer of the solute from the bulk external phase to the external phase-membrane interface; an equilibrium reaction between the solute and the carrier to form the solute-carrier complex at the interface; mass transfer by diffusion of the solute-carrier complex in the membrane phase to the membrane-internal phase interface; another equilibrium reac-tion of the solute-carrier complex to release the solute at the membrane-internal phase in-terface into the internal phase.Models with or without the consideration of film resistances were developed and compared. The models developed in this study can predict the extraction rate through e-mulsion liquid membranes theoretically. All parameters required in the models can be de-termined before an experimental extraction run. Experimental data from literature (urani-um extraction) and (molybdenum extraction and solvent extraction) were used to test the models. The agreements between the theoretical predictions and the experimental data were very good. The advantages of emulsion liquid membrane systems over traditional methods were discussed. The models developed in this research can be used directly for the design of emulsion liquid membrane systems. The results of this study represent a very significant step toward the practical applications of the emulsion liquid membrane technology.
PENGARUH RATIO ASAM OLEAT – SORBITOL PADA PRODUK SORBITAN MONOOLEAT MELALUI PROSES ESTERIFIKASI Anah, Lik
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v0i0.1986

Abstract

The synthesis of sorbitan monooleat was conducted at laboratorium scale by es-terification of sorbitol and oleic acid using p-toluene sulfonic acid as catalyst. The esterifi-cation process was carried out at operation condition : atmospheric pressure; stirred; 7 hours of reaction; 180oC and concentration of catalyst 2.5 % based on sorbitol. The ratio of oleic acid – sorbitol concentration used in this experiment was varried at 0.75; 1.0; 1.25 and 1.50. A sample was drawn off every 10 minutes during the first hour reaction and e-very 30 minutes during the next six hours. The analysed of sample was conducting by de-termining acid value to calculate the sorbitan monooleat product. The result of the experi-ment showed that the optimum ratio of oleic acid - sorbitol was reached at 1.0 with sorbi-tan monooleat production of 72.939 % in 60 minutes with acid value 46.132 and 82.93-5 % in 420 minutes with acid value 30.909.

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