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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 12 Documents
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Search results for , issue "Vol 31, No 3 (2020)" : 12 Documents clear
Risk Analysis Using Job Safety Analysis-Fuzzy Integration for Ship Maintenance Operation Catur Wahyu Nugroho; Trika Pitana; Bagus Dinariyana
IPTEK The Journal for Technology and Science Vol 31, No 3 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v31i3.5655

Abstract

Shipyard is an industry engaged in the maintenance and repair of ships and constructing a new ship. In ship repair operations, there are many activities in this operation. Propeller inspection, blasting, replating, welding, general work, electric work is an activity in ship repair operation. This research proposed a methodology to risk analysis ship maintenance operation, integrating Job Safety Analysis (JSA) with Bayesian Network (BN) and Fuzzy Inferences System (FIS). JSA method is used to find the hazards and the consequences of the maintenance operation. BN is developed for probability calculating of likelihood factors. Meanwhile, the FIS is used as a method to calculate the risk level. The FIS using the Mamdani algorithm based on the expert’s knowledge and experience. The integration of three methods is used to complete the risk assessment for replating activities. The proposed method is used to find out the risk level of replating activity on ship maintenance. Based on the result, the proposed model is more accurate, precise, and flexible depending on the basic factor that influences the operation. It would help to reduce the potential accident on the operation. This proposed method could be the other option as a tool to calculate risk assessment in other operations.
Effect of Courtyard Aspect Ratio on Annual Cooling Energy of Highrise Apartment in Surabaya Dewi, Putri Melati; Antaryama, I Gusti Ngurah; Defiana, Ima
IPTEK The Journal for Technology and Science Vol 31, No 3 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v31i3.5580

Abstract

Rapid development of high-rise apartments, which rely on mechanical cooling,would increase energy consumption. Courtyard existed in various geometries of ahigh-rise apartment in Surabaya as a result of useful layout configuration. The court-yard is one of the passive cooling strategies in vernacular building and is reportedto reduce a building’s energy consumption. The size of the courtyard affects the per-formance of the courtyard. In high-rise courtyard apartments in Surabaya, there isa wide variation of building width and length, affecting the courtyard aspect ratio.This paper investigates the result of annual cooling energy of different courtyardaspect ratio on five apartment geometries with courtyard: H Geometry, U Geom-etry, Double U Geometry, Double L Geometry, and Quadruple L Geometry. Themethod of this research is experimental research with simulation as a tactic. Design-Builder by EnergyPlus is used as simulation tools in this research. The result revealsthat a courtyard with an aspect ratio of 1:2 tends to perform better than a squarecourtyard. Elongating the courtyard of H and U Geometry would reduce the annualcooling energy in all orientations. Elongating the courtyard of Double U, Double L,and Quadruple L Geometries would reduce the annual cooling energy in northwest-southeast orientation and increase annual cooling energy if the building is elongatedalongside the northeast axis..

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