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IPTEK The Journal for Technology and Science
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.
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 18, No 1 (2007)" : 5 Documents clear
Integrated Fuzzy AHP and Weighted-Fuzzy Goal Programming Approach to Solve Supplier Selection Problem with Subjective Factors Annas S. Setiyoko; Udisubakti Ciptomulyono; I. K. Gunarta
IPTEK The Journal for Technology and Science Vol 18, No 1 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i1.181

Abstract

Fuzzy goal programming (FGP) method used in supplier selection process shows that decision maker preferences on each fuzzy goal are not yet considered. In order to accommodate those preferences, that are stated as weight on each fuzzy goal, and called weighted fuzzy goal programming (WFGP) method. Then, the developed method is utilized to solve international supplier selection problem. There would be 4 objective functions developed i.e. to minimize net cost, to minimize late delivery, to minimize net rejected material, as well as to maximize business relationship. Maximization of business relationship objective function is intended to obtain right suppliers related to it score. Those objective functions are optimized subject to total demand, maximum supplier capacity, total purchasing cost based on owner estimate, and minimum order requested by suppliers. Linguistic variables are used to measure criterions in business relationship factor. To do so, fuzzy analytic hierarchy process (FAHP) transforms that qualitative manner in linguistic variables to numerical number as a constant in business relationship objective function. Those proposed method provides enhanced solution that represent decision maker preferences than FGP. That is exhibited with equal relationship between weighted goals value and the output of those weighted goals.
An Investigation into the Application of Maintenance Management Concept Based on Reliability Centered Maintenance of Tni-Al Fleet (Case Study of Corvette / Parchim Class) D.K., Yanif; T.D., Iman
IPTEK The Journal for Technology and Science Vol 18, No 1 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i1.180

Abstract

The majority of TNI-AL war-ships, particularly of parchim class, are old and have been used for more than twenty years. It can be said, intuitively, that rate of degradation of diesel engine system lies in the wear-out period of a bathtub curve. The present paper is aimed to obtain and prove degradation pattern rate and level of risk from diesel engine system installed in KRI fleet of parchim class. Function of degradation rate of each diesel engine system is obtained from the most suitable distribution represent failure mode. Whilst, level of risk is determine with risk matrix. Weibull++ 4, a reliability software, was used to obtain parameters fit to each distribution.
The Physical Treatment Soil Characteristics for Grounding Systems on Madiun and Surabaya Region Bambang Anggoro; Ngapuli I. Sinisuka; Parouli M. Pakpahan; Dicky I. B.
IPTEK The Journal for Technology and Science Vol 18, No 1 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i1.176

Abstract

The research on soil characteristic by measuring soil resistancy and resistivity is an important factor to make a good grounding impedance. The optimal evaluation and planning of the grounding system can be achieved by understanding the soil structure and characteristic. The soil resistivity varies upon soil composition, temperature, water content and its chemical content. In this research we analyse soil characteristics of the samples from Madiun and Surabaya areas by conducting some physical treatments such as water, salt, and carbon treatments. These samples then are tested using 0Hz – 15MHz frequency from sinusoidal power supply. Generally, soil impedance has a negative correlation upon addition of water and salt content, but has no correlation upon additional carbon content.
Simulation of Virtual Tripwire Using Real Time Video Surveillance for the Security of Restricted Area D. Wibawa, Adhi; H. Purnomo, Mauridhie
IPTEK The Journal for Technology and Science Vol 18, No 1 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i1.179

Abstract

Recent development in the security world, video surveillance system has been used widely to protect the most valuable properties or restricted areas in the world. However, the old monitoring system usually only watch the Region of Interest (ROI) without any embedded systems that can trigger automatically the alarm when there are some suspected things happen. By using Virtual Tripwire, video surveillance system can protect safely and effectively the restricted area such as seaport, banking, jail, warehouse, automatic teller machine etc. Virtual tripwire is an algorithm to control the value of some certain pixels in fix position. Virtual tripwire is made of several points which make a rectangle in a captured frame. For the first time, system will take automatically one frame as reference by calculating each point in that rectangle and save them in some arrays. The second step is that in every second system will evaluate all points in the same position to measure weather there are some differences or not. These differences will trigger the alarm automatically. Virtual Tripwire is like a virtual border in the form of rectangle that can avoid everything to pass in a frame grabbed by producing sign.
Feature Selection with Support Vector Machines Applied on Tornado Detection Budi Santosa
IPTEK The Journal for Technology and Science Vol 18, No 1 (2007)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v18i1.178

Abstract

In this paper, a linear programming support vector machine which is based on L1-norm is applied to do feature selection in the tornado data set. The data is the ouputs of Weather Surveillance Radar 1998 Doppler (WSR-88D). The approach is evaluated based on the indices of probability of detection, false alarm rate, bias and Heidke skill. Tornado circulation attributes/variables derived largely from the National Severe Storms Laboratory Mesocyclone Detection Algorithm (MDA) have been investigated for their efficacy in distinguishing between mesocyclones that become tornadic from those which do not.

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