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ISSN : 19798415 EISSN : - DOI : -

Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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EFEK PENAMBAHAN FRASA DALAM FEATURE KATA UNTUK CLUSTERING DOKUMEN TEKS Amir Hamzah
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Text document clustering has been intensively studied because of its important role in text-mining and information retrieval. High dimensionality problem caused by high number of words is always happened in word-based clustering technique using vector space model. Although extracting words in the preprocessing phase is simple, the collection itself can not only be viewed as a set of words but also a set of partly more than one word phrase. Separating a phrase into its parts can eliminate the actual meaning of phrase. Therefore in order to maintain the context of words a phrase must be maintained as a phrase. It is assumed that by adding phrases to words as features in clustering will improve the performance. This paper will study the comparison of word-based and phrase-based clustering. Two clustering models were chosen i.e. hierarchical and partition. Four similarity techniques i.e.: Group Average, Complete Link, Single Link, and Cluster Center were tried for hierarchical, K-Means and Bisecting K-Mean and Buckshot for partition. A document collection from 200-800 news text that has been categorized ma-nually was used to test these algorithms by using F-measure as criteria of 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 show that by adding phrases or simply word pair, although it’s still not statistically significant, it slightly improves the performance of clustering.

KAJIAN PENURUNAN ION (Cl-, SO42-, HCO3-) DALAM AIR LAUT DENGAN RESIN DOWEX Caecilia Pujiastuti
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Salt is one importance requirement in the daily life, which is the basic commodity is seawater (brine). According to the quality aspect, domestic product especially for consumption requirement has not fulfilled the regulation for healthy yet, especially the one produced by salt farmer. Sea water (brine) is held in the influent reservoir then pumped to the stabilizer tank, accommodated in the reservoir, finally flowed to the resin column. In this column used 1000 grams type-1 Dowex strong acid cation resin. The OH- ion in this resin can be used to tie Cl-, SO4-2 and HCO3- ions on the sea water (brine). Seawater (brine) is out from resin column is accommodated in the influent reservoir, taken every hour during five hour, and then the result obtained analyzed. Variable is operated in this research is contact time of sea water (brine) with resin and current velocity. The best result decreasing content of Cl- occur on the 25 litres/hour current velocity, after five hour it was obtained 1,450% with selectivity coefficient -2,940. Decreasing content of SO4-2 occur on the 10 litters/hour current velocity, in the end, it was obtained 7,267261% with selectivity coefficient -4,745. While decreasing contend of HCO3- occur on the 15 litres/ hour current velocity, later than five hour it was obtained 39,92056% with selectivity coefficient -2,373.

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

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.

SISTEM DATA LOGGER TINGGI MUKA AIR PADA DAERAH ALIRAN SUNGAI (DAS) BERBASIS MIKROKONTROLER Muhammad Andang Novinato
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 2 Februari 2010
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

This paper discusses about a distance of water level measurement system which takes a case in a drainage basin. The collected data in data logger will be used as a reference for decision makes concerning the water rate of flow accumulation so we will be able to predict flood or landslide disaster early. The research purpose was designed a digital water level telemetry system to acquire a database system digitally. The results show that the system works well as expected.

GASIFICATION OF WASTE OF OIL SEED COLLECTIONS IN A 20 KWe DOWNDRAFT GASIFIER Anak Agung Putu Susastriawan
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 3 No 1 Agustus 2010
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Waste of oil seed collections, shells and deoiled cakes from current practice of bio-diesel production from Pongamia pinnata seeds, is utilized as a biomass feedstock in a 20 kWe downdraft gasifier. This gasifier is originally conventional wood gasifier. Direct use of this conventional wood gasifier for Pongamia shells leads the blocking of remaining gasified shells in grate region of gasifier reactor. This blocking is noticed as the main problem during the gasification of Pongamia shells. Gap available between the conical grate (16 cm in diameter) and inner wall of gasifier reactor at grate section is found to be too small for free flow of gasified shells. This conventional wood gasifier is modified by replacing the original conical grate with a new fabricated conical grate (15 cm in diameter). Feasibility of waste of oil seed collections for biomass feedstock of a 20 kWe downdraft gasifier is studied in present work. Performances of gasifier are compared for waste of oil seed collections and wood chips in term of calorific value of producer gas and coefficient of thermal conversion. Calorific value of producer gas from wood, Pongamia shells, and Pongamia deoiled cakes is 4.48 MJ/kg, 4.28 MJ/kg, and 2.82 MJ/kg respec-tively. Coefficient of thermal conversion is 0.84, 0.68, and 0.60 for gasification of wood, Pongamia shells, and Pongamia deoiled cakes respectively. An integrated system involving gasifier, spark ignition engine, oil expeller, and decorticator is tested success-fully within 3 hours continuous operation of gasifier on waste of oil seeds collections.

STUDI PROSES DEASETILASI PADA PEMBUATAN KITOSAN DARI LIMBAH UDANG Ani Purwanti; Sumarni -; Tetty Br. Sitohang; Novita Setyawati
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 3 No 2 Februari 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Chitosan is derived from dry shrimp shell that has been demineralized, deprotei-nized, and deacetylized to remove the mineral, protein, and the acetyl group. Chitosan can be used as a food preservative. The aim of this study is to optain the effect of processing time, temperature, solvent volume, and concentration of NaOH in the deacetylation process.In this experiment, the shrimp shell powder had water content and ash content of 5.73% and 29%, respectively. Deproteinization process used a solution of NaOH 5%, processing temperature of 100ºC, and processing time about 2 hours. The process of demineralization used 1N HCl solution, temperature process of 80ºC, and processing time 1 hour. In the deacetylation with fixed variable at at 300 mL of solution of NaOH 40% as a solvent and temperature of 1100C, the relatively good condition of the process is obtained at the processing time of 3 hours. In the experiment with the volume of solvent as a variable, chitosan with optimum of ash content and solution viscosity is reached at the volume of solvent about 300mL. In the experiment with the process temperature are 100ºC and 140ºC, and with the dependent variable, i.e volume of solvent, processing temperature, and concentration of NaOH solution are 300mL, 3 hours, and 40%, respectively, the chitosan with good ash content and viscosity under 200 millipoise is obtained at a temperature of 110°C. In these experiments, chitosan with optimum ash content and viscosity of 1.06% and 175.36 millipoise, respectively, is obtained at processing time, solvent volume, processing temperature, and NaOH concentration at the value of 3 hours, 300 mL, 1100C, and 40%, respectively. The chitosan with optimum characteristics is applied as a coating of tomatoes and grapes. The results shows that the fruits which are dipped into the chitosan solution have a longer lifetime than fruits without preservatives or coated with 1% acetic acid solution.

OPTIMASI PENYERAPAN LIMBAH FOSFAT dan BOD INDUSTRI LAUNDRY DENGAN VARIASI MEDIA TANAM PADA SSF-WETLAND Ernastin Maria; Amallia Puspitasari
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 10 No 1 Agustus 2017
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Loundry industries have abad effect because most of them dump wastes into gutter or river without prior treatment. This study aims to test the potential of Canna Indica L. water plantsin reducing the pollutant content of loundry water (phosphate and BOD). The main research was done by the differene biomass of planting media which was used that is difference of gravel and sand media on SSF-wetland with title fraction and san media on SF-wetland for 10 days.Waste water used is effluent from Mira Loundry in Kanutan vilage, Sumbermulyo Bantul regency, witht the initial concentration of BOD as big as 231,359 mg/l and PO43-as 1,899 mg/l. The research has show that pollutants concentration in the water waste on the SSF-wetland is increase in the hydraulic retention time. For 10 days research the concentrate of BOD and PO43- decrease in SSF-wetland with canna Indica L. plants using of title fraction media, each become 96,680 mg/l (decrease 7,5%) and 1,715 mg/l (decrease 10%). Will using gravel media each become 67,80 mg/l (decrease 71%) and 1,75 mg/l (decrease 7%). From the data both planting media, gravel and title fraction, are considered to have good capability in phosphate waste removal in this system. For the most optimum BOD waste removal is using gravel media with decrease of BOD concentration become 67,880 mg/l.

OPTIMASI PENURUNAN KADAR ASAM DAN ANGKA PEROKSIDA MINYAK JELANTAH INDUSTRI KRECEK RAMBAK DENGAN KULIT SINGKONG Desi Erlita
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 10 No 1 Agustus 2017
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Cooking oil is one of basic food consumed by the whole society. One industry that many use a lot of cooking oil is krecek rambak industries at the Segoroyoso, Pleret, Bantul, Yogyakarta. One waste has not managed well in the rambak krecek industries is jelantah oil. The purpose of this research is to get cooking oil regenerate. The cooking oil regeneration done obtained from purification of jelantah oil using adsorbent (carbon active).One of the materials can be used as a carbon active is cassava skin. The skin cassava obtained from the waste of the merchant food. Making carbon active waste skin cassava done with chemicals process because the process simpler than with physics process. In this research, the longer time of submersion jelantah oil with adsorbent then the lesser levels of free fatty acids and peroxides in jelantah oil. The levels of free fatty acids and peroxide value optimally on the day to 6 submersion of 6,3835% and 15,6179Ml.eq/kg.

HUBUNGAN POWER FAKTOR ISOLASI TERHADAP KEMAMPUAN ISOLASI TRANSFORMATOR DAYA 150/20 KV Mujiman -; Aru Purba Ardian Niagara
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 10 No 1 Agustus 2017
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Isolation transformer is a critical part of the power transformer, insulation deterioration or failure can cause failure of the operation or even damage the transformer. One method to determine the condition of the insulation is by testing with test equipment tangent delta 4000. In a study conducted, will be testing three-winding transformer isolation using test equipment delta 4000, function test equipment delta 4000 to measure the deterioration of the insulation used as insulating oil, paper and ceramics by measuring the power factor. After testing the insulation transformer three windings using test equipment delta 4000, the test result data was analyzed by comparing the value of the power factor of the standard manufacturer with test results using test equipment delta 4000, when comparing the results are the increase in the value of the power factor in data from tests conducted but the increase in the value of the power factor being tested is still on alert limits because some relationships insulation in the test value exceeds> 0.5 of the standard manufacturer is 0.2. However, these data need to be considered further because the value of the power factor should not be more than one.

STUDI FASIES DAN LINGKUNGAN PENGENDAPAN BATUAN KARBONAT, FORMASI WONOSARI, PADA SITUS GOA JEPANG, DAERAH PESISIR PARANGTRITIS, DESA SELOHARJO, KECAMATAN PUNDONG, KABUPATEN BANTUL, DAERAH ISTIMEWA YOGYAKARTA Dina Tania
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 10 No 1 Agustus 2017
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

This research concerning about Facies and Sediment Environment of Carbonate Rock in Wonosari Formation. Research located at Goa Jepang site, in Parangtritis coastal areas, Seloharjo Village, Pundong Sub District, Gunungkidul District, Yogyakarta Special Region. Geographic position S 7o59’54’’-8o00’14’’ and E 110o19’43”-110o19’58”. Method of research is including rock outcrop profile and petrography thin section for three observer location in Goa 1, Goa 2, and Goa 3, from 18 location of Goa. There are 18 sites of Goa Jepang and it has three facies of stone unit, wackestone, packstone and framestone. Carbonate stone evolution for faciesof wackestone and packstone be in stabilization zone and it is placing Goa Jepang on the back reef-reef flat of depositional environment zone. However, for Goa Jepand 2nd location with framestone facies has different carbonate evolution to the diversification phase to come reef crest-reef front of depositional environment zone.

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