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Published by Institut Sains dan Teknologi AKPRIND

ISSN : 19798415 EISSN : - DOI : -

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

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Search results for , issue "Technoscentia Vol 1 No 2 Februari 2009" : 18 Documents clear

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.

HUBUNGAN SEBARAN GERAKAN TANAH DENGAN KELURUSAN STRUKTUR GEOLOGI BERDASARKAN INTERPRETASI CITRA LANDSAT DI DAERAH KEBUMEN JAWA TENGAH Nur, Arief Mustofa; Ansor, Chusni; Purnami, Dwi Novi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Land movements or landslides represent one of the geologic hazards. It is often occur in Indonesia including Kebumen area. Landslide is much related with geologic lineament. The aim these study to know the relation between landslides with geologic lineament. Landslide distribution is obtained by field survey; geologic lineament is obtained by interpretation of digital TM land sat. Dominantly, the geologic lineaments of this area are northwest â€“ southeast ward and southwest â€“ northeast ward. Those are related with tectonic. Most of landslide occurrences at research area reside at geologic linement zona. Landslide also influenced by slope, lithology, landuse and rainfall. Landslide type in research area is creeping, slump, debris slide, debris fall, rock slide, rock fall, earth slip, and subsidence. Research area has high potentiality of landslide; it is done mitigation.

S Wave Velocity Structure in Non-tectonic Indo-China by Analyzing the Earthquakes in Sumatra-Java in TATO Station, Taiwan Santosa, Bagus Jaya
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The velocity structure of S wave under South-East Asia and South China Ocean due to earthquakes in Sumatra-Java subduction zone which data is recorded in TATO, Taiwan seismological station, has been investigated through seismogram analysis in time domain and three components simultaneously. The synthetic seismogram was calculated using GEMINI method, with the inputs are the earth model and the CMT solution of the earthquakes. A low-pas filter with corner frequency of 20 mHz was applied on the seismograms. Applying the deconvolution of unit response on the synthetic seismogram the seismogram comparison was executed in the same unit. The seismogram comparison indicated that the calculation from PREMAN synthetic seismogram deviates significantly from the measured ones. The deviation occurred on the arrival time of surface wave of Rayleigh and Love as well as S body waves. The interpretation results of seismogram analysis using waveform indicate that non-tectonic South-East Asia area in front of subduction zone has strong negative correction of ï¢v in the upper mantle and with smaller factor also at earth layers below. This result shows stronger vertical anisotropy than one in PREMAN earth model.

OPTIMALISASI TEMPERATUR PEMANASAN CETAKAN PERMANEN (300OC, 350OC, 400OC) TERHADAP SIFAT MEKANIK PADUAN ALUMINIUM-MAGNESIUM (SERI 5XXX) Widodo, Basuki
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Aluminium is a light metal which has a very good physical and mechanical properties and it easy to be formed. Casting of aluminium posses some advantages high conductivity and low melting point, enables applied permanent mold too. Material that is used to make mold is from special steel, and when casting process, after aluminium-mag-nesium alloy melting will be poured in mold hence after the permanent mold heated in va-rious temperature which has been determined that is, 300 oC, 350 oC and 400 oC. Heat-ing of mold at this research meant to know how far the influence is happened to mechani-cal properties from Aluminium-Magnesium alloy (series 5xxx) especially tensile strength, hardness and transformation of microstructure. From result of research which to be got best tensile strength value to draw alloy Aluminium-Magnesium (Al-Mg) at 350 oC tem-perature equal to 11,11 kg/mm2 and highest hardness at 350 oC temperature equal to 101,64 HB (Hardness Brinnel) while microstructure that is very homogen also there is at temperature 350 oC.

APLIKASI ERGONOMI PADA PEMBUATAN STANDAR HARD COMPETENCY Nurmianto, Eko; Ningdyah, Widha Kusuma
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

This paper describes the ergonomic application and the determination of stan-dardized working systems hard competency at PT Atak Otomotif Indometal by using Be-havioural Event Interview (BEI) methods and on the spot direct observation. The standard is made as the reference in determining employee minimum performance. By using standardized hard competency already made and weighted using Expert Choice 9.0 Software, furthermore it has to be evaluated towards employee competency to recognize the gap between the standardized and the real competency. Final results show that the average employee comptency is still below at value 2.8 out of 5 based on Panggabean and Walter scale which means their competency tends to fulfill the employer expectation but it needs to be improved. Besides it has approved theory of Nurmianto and Terbit (20-02) who have found that competence is influenced by four factors i.e training, education, working experience, skills which finally conclude that skills is the most influencing factor among other factors towards competency.

PERANCANGAN ALAT PEMECAH KEDELAI YANG ERGONOMIS DENGAN PENDEKATAN INTEGRASI MODEL KANO & QUALITY FUNCTION DEPLOYMENT Asih, Endang Widuri
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Operator work facility is one of the factors which influence work performance in a system. Good work facility must be comfortable for the operator. Operator work facility in a soya curd industry is a soya breaking tool. This tool doesnâ€™t fulfill the standardized concept of ergonomy and user satisfaction. In this paper we are going to discuss operator work facility improvement; that is designing of an ergonomic soya breaking tool which is ideal and needed by the users. In the designing of the soya breaking tool, Kano and QFD models are intergratedly used. The result of the need analysis, we found twelve atributes. From the twelve attributes, after we processed by using Kano model about operator sa-tisfaction, applied in the House of Quality (HOQ), we found that there were five attributes in performance 1 and Basic factor. Those attributes were; the tool was easily maintained, the production process is fast, the tool is not tiring, the tool is save, and design is justified with the work position. To improve the quality of soya breaking tool by using Kano and QFD models, there are two primary factors. First, the tool size used Anthropometry, se-cond, the tool is operated by using feet.

EFEK PENAMBAHAN ASAM SITRAT DAN LAMA PEMANASAN TERHADAP MUTU MINYAK KACANG TANAH SELAMA PENYIMPANAN Susiloningsih, Enny Karti Basuki
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The research aims to analyze the effect of citric acid addition on the quality of peanut oil during storage. Before extracting the oil by steaming and dry heating to know the content and the peroxide value of oil 0 ppm or 200 ppm of citric acid is added to the oil produced from all treatments. The oil samples were stored for 12 weeks at 30Â°C. It is found that steaming at 90oC for 30 minutes, the oil content is 24,84% peroxide value 1.10 meq/kg oil, free fatty acid 0.017% and iodine value 89.955. Meanwhile, dry heating at 45oC without citric acid, the peroxide value 73.75 meq/kg oil, free fatty acid 0.017% and iodine value 89.995 and with citric acid 200 ppm, peroxide value 69.75 meq/kg oil, free fatty acid 0.664% and iodine value 83.685 and not rancid.

ANALISIS PENGENDALIAN KUALITAS MELALUI EVALUASI DAN PERBAIKAN PROSES PRODUKSI DENGAN PENDEKATAN METODE CONTROL CHART DAN METODE TAGUCHI Susetyo, Joko; Yusuf, Muhammad; Saputro, Ardi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Quality is the most important thing in business to get more consumers. Quality will be better if those kinds of processes produced with good constancy. Research was held in Coca Cola Bottling Company Indonesia, problems which were emerging are the sweet disposal (ÂºBrix) from the product is unstable. Control Chart Method is used to get the condition of production process which is moving, than improvement will be done through Taguchi Method approach. Improvement start from election of factors which influence for those qualityâ€™s characteristic as well as level value, and than will be basic for the Orthogonal Array election. Result of analysis is processed through noise signal to ratio (SNR) and Analysis of Variance. Based on research, it was got result that is the best setting level for control factor which is influenced to stability sweet disposal value (ÂºBrix) are first setting of sweetness disposal simple syrup is 59 ÂºBrix, addition of concentrate is 1.25 units, and water disposal is 80 %. Quality is the most important thing in business to get more consumers. Quality will be better if those kinds of processes produced with good constancy. Research was held in Coca Cola Bottling Company Indonesia, problems which were emerging are the sweet disposal (ÂºBrix) from the product is unstable. Control Chart Method is used to get the condition of production process which is moving, than improvement will be done through Taguchi Method approach. Improvement start from election of factors which influence for those qualityâ€™s characteristic as well as level value, and than will be basic for the Orthogonal Array election. Result of analysis is processed through noise signal to ratio (SNR) and Analysis of Variance. Based on research, it was got result that is the best setting level for control factor which is influenced to stability sweet disposal value (ÂºBrix) are first setting of sweetness disposal simple syrup is 59 ÂºBrix, addition of concentrate is 1.25 units, and water disposal is 80 %.

PENGUJIAN KINERJA MESIN DAN EMISI GAS BUANG MESIN DIESEL BERBAHAN BAKAR EMULSI PADA BERBAGAI TEKANAN INJEKSI Mangalla, Lukas Kano; Suardjaja, I Made
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 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.v1i2.398

The aim of this research is to examine the effect of increasing injection pressure on engine performance and exhaust emission of emulsified fueled diesel engine. The diesel exhaust emission such as Nitrogen Oxide (NOx), Carbon Monoxide (CO), Unburned Hydrocarbon (HC) and Soot can be controlled through complete combustion and lower peak combustion temperature. This phenomenon occurred by utilizing fuel-water emulsion at high injection pressure to obtain a good atomization and perfect mixing of fuel-air in combustion chamber. The engine employed in this research was four stroke single cylinder diesel engine, with bore of 75 mm and stroke 80 mm. Engine was operated at vary throttle position from 20%, 40%, 60%, 80% and 100%. At each throttle position rpm, load, fuel consumption, inlet pressure, exhaust temperature, carbon monoxide, unburned hydrocarbon and opacity were measured. CO-HC emissions are measured by Mexa 321E and opacity by LDR tester. The injection pressure of fuel was varied at 145, 170 and 195 kg/cm2. The concentration of water in emulsion fuel was varied of 0%, 10%, 20% and 30%W/O. ABS (Alkyl benzene Sulfonate) was used as emulsifier of water and diesel fuel with 0,22% volume. The result of the research show that torque and power of diesel engine were relatively constant with increasing injection pressure but emission of CO, HC and opacity reduced significantly. Increasing of injection pressure from 145 to 195 kg/cm2 resulted in reducing emission of CO, HC and opacity by 73 %, 60 % and 26.4 % respect-tively at wide-open-throttle.

ANALISIS PENENTUAN KONFIGURASI JARINGAN DISTRIBUSI TERBAIK ANTARA WAREHOUSE DAN DEMAND REGION DENGAN MENGGUNAKAN MODEL BI-CRITERIA Yusuf, Muhammad; Sodikin, Imam
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Determining the best level of aggregation in a centralized supply chain is one of the most difficult problems because of the conflicting objectives and demand uncertainty. PT. Nampar Nos is one of leading drinking water company with various range market in some regions in Flores, even in some islands in East of Nusa Tenggara. Itâ€™s width service area and demand uncertainty. Causes the company has a good decision to decide where the warehouse should be located, and how much the optimal number of warehouses to satisfy the demand. This research uses bi-criteria model to determine the best distribution network between Warehouse and Demand Region. There are two steps in data process-ing that will be done. The first step is to determine the cost that relation with the old distri-bution network in Flores use Gaur and Ravindran model and the second step is to de-velop the new alternative use trial and error method and then calculate the total cost and also responsiveness. After the solver output, we get the best one configuration from 2 alternative configuration distribution network that is developed. Alternative 1 is the best configuration network amount warehouse and demand region which is yield in decreasing total cost per month about Rp 49.996.000 or 11% from level Rp 417.280.400 to Rp 367.284.400. And also decreasing product miles about 7.500 or 5% from 153.500 become 146.000.

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