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IPTEK The Journal for Technology and Science

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Published by Institut Teknologi Sepuluh Nopember Surabaya

ISSN : 08534098 EISSN : 20882033 DOI : -

Core Subject : Science,

Computer Science & IT

IPTEK The Journal for Technology and Science (eISSN: 2088-2033; Print ISSN:0853-4098), is an academic journal on the issued related to natural science and technology. The journal initially published four issues every year, i.e. February, May, August, and November. From 2014, IPTEK the Journal for Technology and Science publish three times a year, they are in April, August and December in online version.

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Articles 345 Documents

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Weighted k Nearest Neighbor Using Grey Relational Analysis To Solve Missing Value Desepta Isna Ulumi; Daniel Siahaan
IPTEK The Journal for Technology and Science Vol 29, No 3 (2018)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Software defect prediction model is an important role in detecting the most vulnerable component error software. Some research have been worked to improve the accuracy of the prediction defects of the software in order to manage human, costs and time. But previous research used specific dataset for software defect prediction model. However, there is no a generic dataset handling for software defect prediction model yet. This research proposed improvements to the results of the software defect prediction on the merged dataset, which is called generic dataset, with a number of different features. In order to balance the number of features, each dataset should be filled with a missing value. To fill the missing values, Weighted k Nearest Neighbor (WkNN) method was used. Then, after missing values were filled, Naïve Bayes was used to classify the selected features. This research needed to obtain a set of features which was relevant, then performed a feature selection method. The results showed that by using seven NASA public MDP datasets, Naïve Bayes with Information Gain (IG) or Symmetric Uncertainty (SU) feature selection presented the best balance value.Software defect, NASA public MDP, weighted KNN,Naive Bayes

Mamminasata BRT User Trip Characteristics for the Design of Demand Modelling Method for a New BRT Line Suprayitno, Hitapriya; Ananda Upa, Verdy
IPTEK The Journal for Technology and Science Vol 27, No 3 (2016)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Indonesia started to developed largely the MRT line, especially the BRT. A new BRT Corridor implementation need a Passenger Demand Prediction. Thus, a Special BRT Passenger Demand Modelling Method for a New BRT Line need to be developed. This attempt needs a sufficient knowledges on the Existing BRT User Trip Characteristics. Mamminasata BRT User Trip Characteristics Survey were executed on Corridor 2 and Corridor 3, during morning peak hour. The result indicates that the BRTs are used mainly for schooling and working trips, the BRT passengers are the previous public transport and motorcycle users. The trip origin zone is extended 3 km to the left and to the right of the BRT corridor, while the trip destination zone is extended 1.5 km to the left and to the right of the BRT corridor. The embarking connecting trip modes are dominated by motorcycle, public transport and becak, while the alighting connecting trip modes are dominated by walking tri

Enhancing Quality of Drying Mixed Shrimp Paste from Karawang with Red Pigment by Angkak Dessy Agustina Sari; Muhamad Djaeni; Azafilmi Hakiim; Sukanta Sukanta; Nurul Asiah; Didik Supriyadi
IPTEK The Journal for Technology and Science Vol 29, No 3 (2018)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v29i2.3575

existence of shrimp paste farmer is supported by activities of auction fish place one of which located Ciparage beach, Karawang – West Java. Perpetrators produced 2 products such as shrimp paste and mixed shrimp paste. Utilization of Rebon shrimp by totality does not need other additives because drying process brings out the color that had itself so final product becomes redness. Involvement of Petek fish almost partially could reduce the color quality so the society used Rhodamine-B dye. This is widely spreading in the area because this matter is distributed by seller directly – door to door and the price is affordable – cheaper. Novelty this research is application of tray dryer with operating temperature variables – 40, 50, 60oC for 7 hours and the presence of Angkak as natural the red pigment that it is safe for human health. The results showed that the optimum condition of drying mixed shrimp paste was achieved by temperature 40oC. This is not about how much and quickly the moisture that evaporating into the air. Paradigm to chemical composition – organoleptic and antioxidant activity – DPPH method also was be consideration for that matter. Physically, this dried product had normal smell, salty taste, brown color, soft texture, solid shape, and normal appearance.

Study of the Recharge Area on Water Basin Soil with Remote Sensing Method Using Satellite Imagery Landsat 7 ETM + and Geographic Information Systems ( GIS ) (Case Study : Pasuruan District ) Isniyatus Sholikhah; Muhammad Taufik; Kukuh Sudjatmiko
IPTEK The Journal for Technology and Science Vol 28, No 3 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Water is natural resources that is very essential for living creatures and the environment. Along with the increase of population , will increase the water demand and reduce the area of free land / open green space for the formation of ground water. By considering soil water conservation aspects, it is necessary to conduct a study of the recharge area on water basin soil in Pasuruan. This study was to determine the condition of the recharge area in the Basin Groundwater Pasuruan in 2003 and 2014. So it will be k[1]nown the changes of the vegetations density and land cover in the recharge area that can affect infiltration process in order to conserve water resources in CAT Pasuruan. From these changes it would be able to make the prediction of future conditions in the recharge area in CAT Pasuruan. This study uses Remote Sensing using Satellite imagery Landsat and Geographic Information System (GIS). Studies to determine the recharge area is influenced by several parameters, that is slope of land, lithology and Rainfall. Processing results obtained vegetation density changes of the recharge area in 2003-2014, high vegetation density decreased by 4330,89 Ha, so that changes in the high vegetation density in 2025 is predicted to be 52305,39 Ha and become 52176,78 Ha in 2030. While land cover changes produce changes in forest land cover increased by 569,88 Ha , so that changes in forest land cover in 2025 is predicted to be 37563,88 Ha and became 38720,494 Ha in 2030. The relationship between vegetation density and land cover of the recharge area in 2003 - 2014 obtained high vegetation density that experienced an increase area, which is on garden land cover amounting to 1144,80 Ha, 943,02 Ha of forest, 947,79 Ha of settlements land cover and 262,53 Ha of vacant land. And that experienced an increase with low vegetation density are the fields amounting to 943,02 Ha and 277,47 Ha of vacant land. Land cover vegetations that dominates throughout the recharge area is a mahogany tree vegetation, and sengon.

The Experimental Study of The Effect of Air Preheating in MSW Pellet Multi-Stage Downdraft Gasifier Depi Rustam Ependi; Arif Rahman Saleh; Bambang Sudarmanta
IPTEK The Journal for Technology and Science Vol 30, No 2 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

High municipal solid waste generation in Indonesia can be used to substitute fossil energy. MSW is converted into pellet form to uniform moisture content. This study aimed to improve the performance of gasified downdraft gasifier processes by heating air inlets in pyrolysis, oxidation, and reduction zones. Variations of air temperature inlet in these zones are 80 oC, 110 oC, 150 oC, and 210oC. The results of this study obtained the highest air temperature at 210 ºC for 969 ºC. The syn-gas compositions (CO and H2) at an increase in temperature of 80-210 ºC increased from 21.4%, 9.99%, and 1.77% to 22.79%, 10.28%, and 1, 79% respectively. Cold gas efficiency increased by 5.13 % and the lowest tar level was 34.39 mg/Nm3. Based on the result of research, preheated air can improve the efficiency of gasification and reduce tar content in the syngas.

A Review of Solar-Powered Boat Development Kurniawan, Adi
IPTEK The Journal for Technology and Science Vol 27, No 1 (2016)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Research in the application of renewable energy has intensified in recent years. The possibility of petroleum extinction in the future is forcing researchers to enhance the utilization of renewable energy resources as substitute for fossil fuel-based technologies in all fields. Ships as one of the most important transportation in the world also require diesel oil as fuel for main propulsion systems and for diesel generators which supply electrical needs. Solar energy has been considered as the most suitable renewable energy resources to substitute the role of fuel in the ships. In this paper, the latest research on the utilization of solar energy in the ship are presented and analyzed to provide information for the researchers who developed the technology of solar-powered boat

3-D Numerical Study of CFB 110 MW: Fluidization in Furnace and Cyclone with Loads And Air Combustion Variation Ari Wirahadi; Heru Mirmanto
IPTEK The Journal for Technology and Science Vol 30, No 2 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Circulating Fluidized Bed (CFB) Boiler has advantages when uses low rank coal compared to Pulverized Boiler. It will be less operational cost but it has greater risk in degradation because of sands material inside the process. Air combustion between primary air and secondary air is one importance parameter that influence fluidization of CFB. Numerical simulation of commercial CFD was used with Eulerian multiphase model implemented to analyzed sand volume of fraction, air and sand velocity including distribution of pressure around furnace. It was used 55%-45% air combustion ratio of primary and secondary air as reference when boiler operated at 63% and 100% based on operation performance of CFB and then it was simulated with additional variation of air combustion ratio with 50%-50%. Simulation of 110% load was added using all of variation of air combustion. The simulation showed that fluidization with air combustion ratio 50%-50% and 55%-45% executed well when operated at 63%. Meanwhile, fluidization 100% and 110% with all those air combustion ratios would cause a great number of sands entered inlet cyclone and higher sands and air velocities.

Antimicrobial Assay of Soil Mold Isolates from Wonorejo Surabaya Arisanti, Septia; Kuswytasari, Nengah Dwianita; Shovitri, Maya
IPTEK The Journal for Technology and Science Vol 23, No 4 (2012)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

This study was aimed to an examine antimicrobial activity of 34 soil molds isolates from the Wonorejo Surabaya on the growth of Gram negatif bacteria (Escherichia coli and Coliform Bacteria Group), Gram positif bacteria (Bacillus subtilis) and yeast (Saccharomyces cerevisiae). Antimicrobial ability detected with modification of dual culture antagonism assay in Potato Dextrose Agar (PDA) medium. The result showed that genus Aspergillus, Scopulariopsis, Penicillium, Paecilomyces, Fusarium, and Trichoderma were able to inhibit E. coli; while genus Aspergillus, Scopulariopsis, Penicillium, Paecilomyces, Exophiala, Stachybotrys, and Acremonium inhibit B. subtilis; further on only genus Aspergillus could inhibit group of Coliform bacteria); and genus Scopulariopsis, Penicillium, Trichoderma, and Absidia inhibited the growth of yeast S. cerevisiae.

Time Series Analysis of Sea Surface Temperature With Aqua MODIS from 2011 to 2016. Case Studi: North Coast of Gresik and Madura Hendrata Wibisana; Siti Zainab
IPTEK The Journal for Technology and Science Vol 28, No 1 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Sea surface temperature (SST) is a measurement parameter for the condition of coastal and marine water quality, where the value of SST is a measure of fertility of ecosystems in the waters concerning the lives of flora and fauna. To measure the SST can be done by several methods, simple by using a alcohol thermometer dipped into the sea and water bodies to obtain the existing value of the SPL. To measure a wider area in order to obtain a global picture of course is not effective to measure in situ, we need a technology and methods that can replace the monitoring of the global SST, for the purposes of the use of remote sensing technologies by using algorithms that have been widely used. As the material in this study used satellite imagery Aqua Modis 250 meters during January from 2011 to 2016 that can instantly detect the SST value at some predetermined coordinates and as a case study area have Gresik coast towards the northern part of the island of Madura. The results obtained from this study is that the range value of standard deviation and variation of the average value of SST per year, which the SST is in the range of 27oC to 32oC, and from linear regression obtained an average value of R squared of 0.748 for a period of 6 years the process of aquisition of satellite imagery. The coastal area around the north Pangkah Gresik has the highest temperature is 31oC while the waters to the north of Madura has an average temperature of 28oC.

Improving the Sharpness of Digital Images Using a Modified Laplacian Sharpening Technique Zohair Al-Ameen; Shamil Al-Ameen; Ahmed Al-Othman
IPTEK The Journal for Technology and Science Vol 29, No 2 (2018)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Many imaging systems produce images with deficient sharpness due to different real limitations. Hence, various image sharpening techniques have been used to improve the acutance of digital images. One of such is the well-known Laplacian sharpening technique. When implementing the basic Laplacian technique for image sharpening, two main drawbacks were detected. First, the amount of introduced sharpness cannot be increased or decreased. Second, in many situations, the resulted image suffers from a noticeable increase in brightness around the sharpened edges. In this article, an improved version of the basic Laplacian technique is proposed, wherein it contains two key modifications of weighting the Laplace operator to control the introduced sharpness and tweaking the second order derivatives to provide adequate brightness for recovered edges. To perform reliable experiments, only real-degraded images were used, and their accuracies were measured using a specialized no-reference image quality assessment metric. From the obtained experimental results, it is evident that the proposed technique outperformed the comparable techniques in terms of recorded accuracy and visual appearance.

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