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AN ANALYSIS ON KRI IMPROVEMENT PROJECT IN INDONESIAN NAVAL MAIN BASE NO. V SURABAYA FASHARKAN (NAVY’S BATTLESHIPS MAINTENANCE AND REPAIRING FACILITIES USING FUZZY FMEA METHOD Krisdiono, Eko; Putra A, I Nengah; Astika, I Made Jiwa; Suharjo, Bambang
INTERNATIONAL JOURNAL OF ASRO - STTAL Vol 10 No 1 (2019): International Journal of ASRO
Publisher : Indonesian Naval Technology College - STTAL

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Abstract

The FMEA method is a tool used to identify the consequences or consequences of a system or process failure and reduce or eliminate failure. In determining risk factors and system improvement priorities, traditional FMEA still has weaknesses, where FMEA traditionally places severity factors, occurrence, and detection at the same level of importance, even though in reality different levels of importance and the importance of FMEA assessment teams are ignored.          In this study, the fuzzy method is integrated into FMEA where the severity factor, occurrence, and detection are assessed in linguistic form. In this fuzzy method, the weight of the interests of the FMEA assessment team is taken into account to do ranking and repair priorities. The application of Fuzzy methods to FMEA to determine significant risk factors and prioritizing improvements from various alternatives chosen for the process of repairing KRI in Surabaya Lantamal V, so that it is expected that the application of this method can improve the operational performance of Fasharkan to eliminate or reduce the risks that occur in the repair process ships in the eastern region of the fleet. Keywords: Risk Management, Failure Modes and Effect Analysis (FMEA), Fuzzy Method
POTENTIAL OF SEA FLOW ENERGY AS A RENEWABLE ENERGY SOURCE (RENEWABLE ENERGY) ON THE CAPALULU HOLIDAY, NORTH MALUKU Widjayanto, Joni; Bandono, Adi; Astika, I Made Jiwa; Tresnadi, Agung
INTERNATIONAL JOURNAL OF ASRO - STTAL Vol 11 No 1 (2020): International Journal of ASRO
Publisher : Indonesian Naval Technology College - STTAL

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Abstract

One of the biggest obstacles to development progress in Eastern Indonesia is the unavailability of electricity,especially on small island islands. The potential of ocean currents is one of the most renewable sources ofenergy considering that the majority of Eastern Indonesia is the ocean and has not been utilized optimally. Thepurpose of writing this paper is to reference the calculation of ocean currents for Indonesian coastal islands thathave minimal electricity. This research method uses literature studies on the morphology of the flow velocity andwind that occurs in the Capalulu Strait and the calculation of the potential of electrical energy in the CapaluluStrait so that the results of this calculation are used as one of the renewable energy methods that are able tomeet the electricity needs of island islands. which has not been electrified in Indonesia, especially in the SulaIslands, North Maluku.Keywords: Electric Energy, Ocean Flow Turbine, Renewable Energy, Strait of Capalulu
RISK ASSESSMENT PADA PROSES DISTRIBUSI BAHAN BAKAR MINYAK DI KOBANGDIKAL Astika, I Made Jiwa
ASRO JOURNAL - STTAL Vol 1 (2014): Jurnal Analisis Sistem & Riset Operasi
Publisher : Indonesian Naval INSTITUTE OF TECHNOLOGY - STTAL

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Abstract

Pelayanan kepada konsumen merupakan akhir dari proses bisnis sebuah industri. Keakuratan danketepatan produk, baik dalam hal volume maupun kualitasnya sangat mempengaruhi pelayanan sebuah perusahaanatau organisasi. Bahan bakar minyak (BBM) merupakan produk yang sangat penting bagi seluruh anggota TNI ALdi wilayah Kobangdikal, yang dipergunakan untuk keperluan militer, keperluan dinas dan keseharian kegiatanseluruh anggota TNI AL di wilayah Kobangdikal. Sejak diberlakukannya AFTA (ASEAN FREE TRADE AREA) padatahun 2004, Pertamina melakukan peningkatan kualitas pelayanan dengan meluncurkan program PASTI PAS!, yangmerupakan program sertifikasi standar kualitas pelayanan, dalam hal ini SPBT Kobangdikal juga mengikutiperkembangannya yaitu dengan ikut melaksanakan peningkatan kualitas pelayanan sesuai dengan standar PTPertamina.Dalam penyusunan tugas akhir ini, peneliti menganalisa risk event yang terjadi dengan meneliti secara deskriptifyang menggunakan analisa secara kuantitatif dan dengan metode sampling sederhana yang berupa wawancara,pengamatan, dan kuisioner dari 7 orang anggota satuan perbekalan Kobangdikal.Berdasarkan hasil analisis data dan identifikasi risiko maka diperoleh 15 kejadian risiko (risk event) yang mungkinmuncul dalam proses distribusi selama proses penimbunan hingga penyaluran dari Terminal BBM Surabaya Grouphingga ke SPBT Kobangdikal. Dari penilaian Severity, Occurance, dan Detection, dilanjutkan dengan Pareto chartkemudian diketahui risiko dari yang tertinggi hingga terendah.
Nitration Time and Ultrasonic Waves Utilization Effects Against Mol Percentage of Nitrogen in Nitrocellulose Synthetic Based on Cotton Fiber Rahman, Mohammad Farid; Astika, I Made Jiwa; Kurniawan, Yudhi Dwi; Suratmo, Suratmo
Natural B Vol 1, No 2 (2011)
Publisher : Natural B

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (10.378 KB) | DOI: 10.21776/ub.natural-b.2011.001.02.10

Abstract

Nitrocellulose is an ester of nitric acid from cellulose which has important role in propellant manufacture, especially having minimal degree of substitution (DS) of 2.5. The aims of this research were to understand the influence of time of reaction in nitration of cotton fiber both synthesized with and without using ultrasonic wave irradiation to mole percentages of nitrogen in nitrocellulose products. The nitrations were conducted by using mixture of sulphuric acid and nitric acid with mass composition ratio of 3:1 (30 mLs of H2SO4 95-97% (w/w) solution; 20 mLs of HNO3 65% (w/w) solution) for 35, 40, 45, 50 and 55 minutes at temperature of 28-29oC, whereas in irradiation treatment by ultrasonic wave the initial temperature adjusted at the same. The mol percentages of nitrogen in nitrocellulose products were determined by using absorbance ratio method from IR spectra without external calibration prerequisite. The results showed that the mol percentages of nitrogen in nitrocelluloses both synthesized with and without using ultrasonic wave irradiation tended to increase up to about 45 minutes and tended to decrease after it. The highest mole percentage of nitrogen in nitrocellulose product synthesized without using ultrasonic wave irradiation was 33.05% with DS of 0.99; whereas that of using ultrasonic wave irradiation increased to 52.78% with DS of 1.58. The analysis of IR spectra and burning characteristic from nitrocellulose products showed the existence of the NO2 group in nitrocellulose products.
DAMPAK TINGKAT PENDIDIKAN TERHADAP KETAHANAN NASIONAL MASYARAKAT DI KABUPATEN BANGKALAN : SEBUAH PENDEKATAN MODEL SISTEM DINAMIK Bandono, Adi; Astika, I Made Jiwa; Efendi, Beben
INTERNATIONAL JOURNAL OF ASRO - STTAL Vol 8 (2017): Jurnal Analisis Sistem & Riset Operasi
Publisher : Indonesian Naval Technology College - STTAL

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Abstract

Tujuan dari penelitian ini adalah untuk menganalisa dampak tingkat pendidikan terhadap ketahanan nasional masyarakat di Kabupaten Bangkalan, serta mendapatkan skenario kebijakan yang tepat dalam pengembangan tingkat pendidikan sehingga dapat meningkatkan dampaknya terhadap ketahanan nasional masyarakat di Kabupaten Bangkalan. Metode yang digunakan dalam penelitian ini adalah Decision Making Trial Evaluation and Laboratory (DEMATEL) untuk mendapatkan variabel kunci dari suatu sistem serta mendapatkan hubungan keterkaitannya, dan pendekatan sistem dinamik untuk menganalisa dampak tingkat pendidikan terhadap ketahanan nasional di wilayah Kabupaten Bangkalan. Terdapat tiga skenario kebijakan yang diterapkan pada penelitian ini, antara lain; skenario peningkatan prosentase dana lembaga pendidikan (skenario 1), skenario peningkatan dana beasiswa (skenario 2) dan skenario kombinasi (skenario 3). Hasil penelitian menunjukkan bahwa tingkat pendidikan berdampak positif terhadap nilai ketahanan nasional di Kabupaten Bangkalan melalui Indeks Pembangunan Manusia (IPM). Skenario kebijakan yang tepat untuk diterapkan ke dalam sistem adalah skenario 3 dan skenario 2, dengan nilai ketahanan nasional Kabupaten Bangkalan sebesar 0,77 atau tangguh pada periode tahun 2020.
DESIGN AND DEVELOPMENT OF TARGET DESIGN WITH BASIC IMAGE PROCESSING ON OTHTT SYSTEM PROTOTYPE (OVER THE HORIZON TARGET TRACKING) Purwanto, Sigit; Astika, I Made Jiwa; Sahiri, Erpan; K. Novarendra, Ekaris
ASRO JOURNAL-STTAL-INTERNATIONAL JOURNAL Vol 11 No 2 (2020): International Journal of ASRO
Publisher : Indonesian Naval Technology College - Sekolah Tinggi Teknologi Angkatan Laut - STTAL

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Abstract

Based on Law No. 34 of 2004, the Indonesian Navy has the main task of maintaining state sovereignty in territorial waters. Various attempts have been made to strengthen the Navy so that it can carry out these basic tasks, one of which is to add defense equipment, namely ships that have the ability to shoot missiles. This missile possession is important because in addition to being a deterence effect, modern naval battles are dominated by long-distance warfare or Over The Horizon. In missile fire, accurate intelligence is needed to determine the position of the target. So far what has been done is sending submarines or reconnaissance aircraft. This is very inefficient because in addition to requiring large resources, the risk of losing personnel and material is also very large. Based on this, the researcher makes a prototype of a vehicle that can identify and determine the position of a target. The vehicle in the form of a UAV is equipped with GPS, altimeter, compass and camera. This equipment will provide data in the form of UAV latitude and longitude position, UAV height, UAV heading and UAV camera angle. From the four data above, the ground station on themissile carrier gets the target's latitude and longitude data based on image processing. While the method used is color thresholding which can distinguish a target based on its color. After several trials, the UAV has been able to carry out the target positioning up to a height of 15.4 meters. At these heights the target latitude can be determined with a system accuracy of 3.3 meters. To be used as a reference for missile firing, it is necessary to increase the capability of the equipment specifications to reach the desired distance. Keywords: Target, Latitude, Longitude, Image Processing.
SELECTION OF KRI HARDEPO PRIORITIES USING THE FUZZY MCDM METHODS Suharjo, Bambang; Astika, I Made Jiwa; Setiadji, Agus; Purnomo, Joko
ASRO JOURNAL-STTAL-INTERNATIONAL JOURNAL Vol 11 No 2 (2020): International Journal of ASRO
Publisher : Indonesian Naval Technology College - Sekolah Tinggi Teknologi Angkatan Laut - STTAL

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Abstract

The Unitary State of the Republic of Indonesia (NKRI) is the largest archipelagic country in the world, two thirds of which are is seas, requiring the presence of the KRI in maintaining its sovereignty. Continuity of attendance in carrying out its main duties, the Navy depends on the readiness of the KRI (Indonesian Republic Warship). The Navy's strength development program is bound to the MEF (Minimum Essencial Force), the basic development policy of TNI AL towards minimum principal strength. The main target of MEF is a limited amount but can operate optimally. So we need a program to overcome these problems by maximizing the defense system maintenance program called SPT (Planned Maintenance System). To maximize the planned maintenance system that supports the MEF program requires prioritization in selecting the KRI that will carry out Depo level improvement (Hardepo). The selection of KRI determination that will implement Hardepo has several factors that need to be considered so that it is categorized in a multi-criteria decision environment, then the proposed model becomes an appropriate methodology to accommodate the criteria with the Fuzzy MCDM (Multi Criteria Decision Maker) approach. In this study there are six alternative KRI namely KRI Keris-624, KRI Rimau Island-726, KRI Kerapu-812, KRI Badau-841, KRI Jakarta Bay-541 and KRI Arun-903 where the first priorities obtained are KRI Rimau Island- 726 with a weight value of 0.1778. After the priority is obtained then schedule the duration and availability of Docking at PT PAL Indonesia where all KRI can carry out docking every TW (Tri Wulan) except KRI Arun-903 which cannot carry out docking on TW I 2019. Keyword : MEF, SPT, Hardepo, Fuzzy MCDM, Docking Scheduling.