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Rekayasa
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  This is an Open Access Journal Open Access journal
ISSN (Print) 0216-9495 - ISSN (Online) 2502-5325
Published by Trunojoyo University Homepage  [5 journals]
  • Pengaruh Tinggi Puncak Struktur Hexagonal Artificial Reef Terhadap
           Kemampuan Redamanan Gelombang

    • Authors: Muhammad Baharudin Fahmi, Haryo Dwito Armono, Muhammad Zikra, Harish Wirayuhanto
      Pages: 114 - 120
      Abstract: Generally, the purpose of artificial reefs is to rebuild naturally occurring coral reefs that have been destroyed. Without sacrificing the attractiveness of the protected beach, these manmade reefs functioned as new habitats for marine life and protected coasts by reducing wave energy. on the other side man-made artificial reefs can perform as submerged breakwaters, their ability to dampen incoming waves must be investigated. In this paper, the researchers present a new shape in the form of a hexagonal artificial reef. The wave attenuation performance index is calculated using the wave attenuation performance rating. The research focuses on the effect of structural height (h/d) on transmission wave value using a physical testing method on a scale of 1:10 at the wave flume of the Department of Marine Engineering, Sepuluh Nopember Institute of Technology, Surabaya. The test results indicate that the smallest transmission coefficient (KT) was produced on artificial reefs Configuration A-3 with the greatest submerged depth (h/d=0.75). The parameter results indicate that the greater the wave steepness (H/gT2) and the significantly larger the immersion depth (h/d), the better the wave reduction.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.14848
      Issue No: Vol. 15, No. 2 (2022)
       
  • Pemodelan Sistem Dinamik Eco-Drainage di Wilayah Tanah Basah (Studi Kasus
           Kawasan Kelapa Gading DKI Jakarta)

    • Authors: Fitria Rahmawati, Henita Rahmayanti, Bagus Sumargo
      Pages: 121 - 128
      Abstract: An Ecological drainage becomes an application in this development project in the Kelapa Gading area. The drainage concept that is applied is a drainage system in which rainwater that falls on road surface runoff will flow directly into the water infiltration system and directly fill the ground surface water. Geologically, it can be seen that North Jakarta is an area with a fairly high ground water level (MAT), and has an average MAT elevation of 2 - 2.5 m. This study intends to determine the ability of this ecodrainage to reduce runoff/floods that often occur in areas with a fairly high MAL. What direct benefits can be felt in the use of ecodrainage in these flood-prone areas, thus making the basic reason for applying this ecodrainage. This study uses a dynamic systems approach. In the preparation of the dynamic system model, Powersim Studio Version 10 software will be assisted. The simulation results show that an increase in rainfall every year will provide an increasing flood potential. By using eco-drainage, it is felt that it is not optimal enough to reduce runoff in areas that have high MAT levels. However, this ecodrainage still provides broad sustainability benefits. The quantity of groundwater will slowly be filled up to the aquier layer through this ecodrainage. This step is considered to be able to help prevent the aquifer layer from being exposed and have an impact on the rate of land subsidence so that the potential for flooding will decrease.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.15057
      Issue No: Vol. 15, No. 2 (2022)
       
  • Sizing Optimization Using Genetic Algorithm to Achieve Minimal Offshore
           Structure

    • Authors: Ferdita Syalsabila, Rudi Walujo Prastianto, Daniel Mohammad Rosyid
      Pages: 129 - 136
      Abstract: Accelerating marginal field development must consider the economic factor. While the structural strength must remain capable and robust when subjected to environmental loads. To meet the desired objective in design phase, optimization is used. With the rapid growth of computing technology, the optimization method is developed as more advanced and reduced iteration time. However, the structural evaluation of jacket structure is a complex problem. The usual process of structure evaluation is through finite element analysis, and it is still time-consuming. Thus, surrogate models can evaluate the structure, lowering computational time. This study optimizes the jacket structure to get an affordable and robust minimal jacket structure. Sizing optimization will be performed on the jacket's leg and bracing thickness. For single-objective optimization, weight structure is considered the objective function, and multi-objective optimization adds production cost as the second objective function. The surrogate model uses the radial basis function to predict the relation between design variables and ultimate limit strength. The functions generated from the surrogate model will act as behaviour constraints in the optimization process. For consideration, X-type and V-type bracing configurations are compared. Different results were obtained from the single objective and multi-objective optimization process.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.15102
      Issue No: Vol. 15, No. 2 (2022)
       
  • Waktu Henti Antibotik Chloramphenicol Terhadap Perubahan Kadar Residu Pada
           Ikan Bandeng (Chanos Chanos)

    • Authors: Didik Budiyanto, Sri Oetami Madyowati, Achmad Kusyairi
      Pages: 137 - 142
      Abstract: Milkfish is one of the fishery commodities that are in great demand by the Indonesian people, where the obstacle to production decline is disease. Therefore, to prevent disease and treat diseases that attack fish, farmers use the antibiotic Chloramphenicol. However, the use of high doses of antibiotics will cause resistance to pathogenic bacteria and the residue left in the fish's body will have a negative impact on human health who consume them such as allergies, toxicity and even cause death in anemia sufferers which can progress to leukemia. This study aims to determine the length of downtime of the antibiotic Chloramphenicol on changes in residual levels in milkfish (Chanos chanos) aged 30 days decreased to a safe limit for consumption. Residual content test using ELISA at 450 nm wave. Based on the results of the study, milkfish fed with a mixture of chloramphenicol antibiotics at a dose of 1 ppm resulted in the highest residual value of 4.6375 ppb in the first week and a decrease in residue to 0.2363 ppb for 5 weeks. The stopping time of chloramphenicol antibiotics on changes in residual levels in milkfish (Chanos chanos) aged 30 days in treatment F (Milkfish fed with a mixture of chloramphenicol at a dose of 1g/kg of feed for a week, then fed without a mixture of chloramphenicol for 5 weeks) resulted in a safe limit for consumption.

      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.14135
      Issue No: Vol. 15, No. 2 (2022)
       
  • Review Aktivitas Fotosintesis pada Tanaman Sorgum (Sorghum bicolor) dalam
           Kondisi Cekaman Kekeringan

    • Authors: Mukhamad Su'udi, Arsetyo Rahardianto, Miatin Alvin Septianasari, Veren Yuliana Saputri, Dwi Setyawati, Fuad Bahrul Ulum
      Pages: 143 - 150
      Abstract: Sorghum (Sorghum bicolor L. Moench) is a cereal crop that has the potential to be developed in Indonesia as a food, feed and industrial crop. Sorghum is a C4 plant that has the advantage of efficiency in hot and dry environments. Drought stress is one of the most limiting environmental factors for crop productivity worldwide, and can be caused by water deficits in the soil and in the atmosphere. On the decreasing leaf water status, the rate of CO2 assimilation and the conductance of stomata decreased rapidly. The CO2 concentration mechanism is able to saturate C4 photosynthesis under the relatively low intercellular CO2 concentration. In addition, CO2 photorespiration is likely to be repaired before it exits the bundle sheat cells. The effects of non-stomatal factors include reduced activity of photosynthetic enzymes, inhibition of nitrate assimilation, induction of premature aging, and changes in leaf anatomy. Photosynthesis in C4 plants, including sorghum, involves, others, the PEPC and Rubisco enzymes. Drought can also trigger oxidative stress, which is an environmental condition that has increased Reactive Oxygen Species (ROS) due to an over reduction of the photosynthesis process.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.9799
      Issue No: Vol. 15, No. 2 (2022)
       
  • Uji Toksisitas Ekstrak Daun Sirih (Piper betle) Terhadap Benih Ikan Kakap
           Putih (Lates calcarifer)

    • Authors: Leni Mardiana, Nunik Cokrowati, Alis Mukhlis
      Pages: 151 - 157
      Abstract: White snapper (Lates calcarifer) is a type of seawater fish that is in great demand by the public. This study aims to determine the 48-hour LC50 value and the effect of using betel leaf extract on the health status of white snapper. This research was conducted in July 2020 which took place at the Sekotong Coastal Aquaculture Development Center (BPBPP), West Lombok Regency, West Nusa Tenggara. This research was conducted using experimental methods. This study used 5 treatments and three replications, to obtain 15 experimental units with doses of 0 ppm, 80 ppm, 90 ppm, 100 ppm and 200 ppm. Data analysis was performed using a linear regression test, namely probit analysis by testing the mortality of tested animals and calculated through statistical data using Microsoft Excel. The higher the betel leaf extract concentration, the higher the number of white snapper seed deaths. This happens because the betel leaf extract contains active antimicrobial compounds, but at high concentrations, it can poison the white snapper seeds. For further research, it is recommended to test the toxicity of betel leaf extract on the mortality of white snapper with variations in water quality. 

      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.10137
      Issue No: Vol. 15, No. 2 (2022)
       
  • Strategi Pemilihan Pesawat Angkut Militer Produksi PT. Dirgantara
           Indonesia Untuk Mendukung Industri Pertahanan Dalam Negeri

    • Authors: Joan Ferdiyanto, I Made Wira Hadi Arsanta, Sadimin Sadimin
      Pages: 158 - 163
      Abstract: Indonesian Navy flights as an integral part of the SSAT have several functions, one of which is to provide rapid logistical support. Based on considerations of function and mobilization capabilities, medium-sized military transport aircraft are the main choice in providing rapid logistical support. The advantages of this function and mobility also make military transport aircraft capable of carrying out additional tasks assigned to their guiding squadron, namely the 600 Air Wing Squadron. The additional tasks are Search and Rescue (SAR), Air Medical Evacuation (EMU) and VIP Flights. Currently, there are 11 elements of the NC212-200 aircraft owned by Puspenerbal, with a description of 7 active elements, 4 disposal processes. In 2017, Puspenerbal received the Beechcraft King Air 350i light transport aircraft, but several operational requirements were not met to carry out the main function as an element of fast logistics support provider, so this element was prioritized to carry out additional functions such as VIP flights. The results of the analysis using the Analytic Hierarchy Process (AHP) method with the help of the Expert Choice 11 Application show the weight of the criteria for selecting medium military transport aircraft, namely Navigation and Communication Equipment 46.4%, Short Take-off and Landing (STOL) Ability 31.7 %, Transportability 15.3%, and Flying Ability 6.7% with an Inconsistency value of 0.07. This shows that the calculation of the correspondent is still within the inconsistency threshold, which cannot be more than 0.1. While the order of priority for the alternative types of medium military transport aircraft from high to low is the CN 295 type 80.5% and the Alenia C27J Spartan type 19.5%. Based on this value, it can be seen that the CN 295 Medium Military Transport Aircraft is the right alternative to be chosen.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.14152
      Issue No: Vol. 15, No. 2 (2022)
       
  • Kombinasi Sistem Solar Tracker Dua Sumbu dan Automatic Transfer Switch
           (ATS) untuk Menstabilkan Tegangan Keluaran Pembangkit Photovoltaic (PV)
           Menggunakan Sensor Photodioda dan Arduino Nano

    • Authors: Agung Hadi Tamari, Amirullah Amirullah
      Pages: 164 - 174
      Abstract: The performance of a photovoltaic (PV) generator is strongly influenced by the intensity of sunlight hitting the solar module. Thus it takes the position of the solar module which is always perpendicular to the direction of the sun's rays. To overcome this, it is necessary to design and implement a two-axis solar tracker system using a servo motor that is able to dynamically drive a PV generator following the direction of movement of sunlight supplied by an AC power source (PLN). The problem is that if the AC source is disturbed, the motor drive stops working so that the absorption of sunlight is not optimal. The research proposes the design and implementation of a two-axis solar tracker system based on Arduino Nano using a photodiode sensor and automatic transfer switch (ATS). ATS functions if there is a disturbance in the AC source, the system automatically transfers the load power supply to a DC source in the form of a battery or vice versa, so that the tool is still able to work. The photodiode sensor in the Arduino Nano circuit is used because it has better sensitivity to sunlight than the light-dependent resistor (LDR) sensor. The PV generator in this study uses the PV1 and PV2 modules. The results shows that the PV module using a two-axis tracker system with dynamic movement following the movement of the sun's position is able to produce a more significant and more stable average output voltage-than the system without using a tracker both on the static PV module position facing east and west respectively by 12.34% and 10.94%. The sensitivity of the photodiode sensor to sunlight also helps improve the performance of the proposed system so that the PV output voltage in the 09.00-15.00 WIB period, becomes larger and more stable than the system without a solar tracker.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.14444
      Issue No: Vol. 15, No. 2 (2022)
       
  • Pemanfaatan Analytical Hirarchy Process untuk Penentuan Karakteristik
           Combat Aircraft dalam Rangka Mendukung Industri Pertahanan Nasional

    • Authors: Ahmad Afandi, Dwi Soedianto, Edy Iwan Bangun
      Pages: 175 - 181
      Abstract: The Indonesian Air Force is the main combat tool in the use of force to defend the sovereignty and territorial integrity of the Unitary State of the Republic of Indonesia as a unit in order to achieve guarantees for the safety of the nation and state. Indonesia only relies on 33 F-16 AM, BM, C and D aircraft, which are more than 30 years old. Then 16 Sukhoi 27 and 30 aircraft with almost 20 years of age as the main fighter aircraft. The limited number of aircraft spare parts as well as the limited types and number of guided missiles also caused the combat readiness of the F16 and Sukhoi 27 and 30 aircraft to be not optimal. The F5 Tiger fighter has fallen out of service in recent years and there has been no replacement to date. Likewise, the Hawk 100/200 aircraft which are more than 25 years old. the obligation of the Ministry of Defense to plan the purchase of fighter aircraft that will operate until 2030 and 2040. This research will use the Analytical Hierarchy Process (AHP) method to determine the choice of Combat Aircraft with predetermined criteria with the alternative choice of Dassault Rafale fighter aircraft from France, the Su 35 Russian-made and US-made F-15 EX aircraft. The highest data processing results are Dassault Rafale 63.7%, Su 35 20.3% and F-15 EX 16%. The result of the Multirole Combat Aircraft selection is that the Dassaut Rafale is selected. with an Inconsistency value of 0.04. This shows that the alternative calculation is still within the inconsistency threshold, which is <0.1. With the election of Dassault Rafale, it is hoped that the Transfer of Technology with PT. Indonesian Aerospace in order to increase the capability of the Domestic Defense Industry, especially the Air Force. later PT DI will be directly involved in the Maintenance, Repair, and Overhaul (MRO) process, including the preparation of the supporting infrastructure
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.14154
      Issue No: Vol. 15, No. 2 (2022)
       
  • Implementasi Inverter Berbasis Square Wave dan Sinusoidal PWM Menggunakan
           Arduino Uno

    • Authors: R Dwiki Rachwanto, Saidah Saidah, Amirullah Amirullah
      Pages: 182 - 191
      Abstract: Inverters with square waves and sinusoidal output signal waves have different efficiency values. The difference is very visible, especially when the inverter is used to drive an electric device that uses a motor. In a sinusoidal wave type inverter, electricity consumption will be more efficient than the use of a square wave type inverter. This study aims to determine the efficiency value of the square wave and sinusoidal inverter wave output in supplying the load. Square wave and sinusoidal inverters require a controller, the controller uses an Arduino Uno which acts as an SPWM signal generator and a square wave signal is used to drive the MOSFET with push-pulls topology. Based on the results of the inverter test to determine the efficiency, it shows that the inverter with sinusoidal output is 96.40% better, while the inverter with square wave output is only 83.34%, this test is carried out using a 50W LED lamp load.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.13454
      Issue No: Vol. 15, No. 2 (2022)
       
  • Analisis Stabilitas Artificial Reefs Tipe Hexagonal

    • Authors: Muhammad Rifqi Hanif, Haryo Dwito Armono
      Pages: 192 - 198
      Abstract: In solving the problem of abrasion and also protecting marine ecosystems, it is necessary to come up with an idea, namely a wave energy retaining structure that is also capable of being a habitat for marine biota. Therefore, in this study, artificial coral reefs were tested which are considered capable to solve these problems, plus those which at the same time rehabilitate damaged coral reef ecosystems. The artificial reefs model in this test is a hexagonal type with one layer arrangement. To get the success value (KD) of artificial reefs, it is seen from the percentage of damage caused by the influence of height and wave period. Then the KD value was calculated using the Hudson formula so that it was found that the hexagonal type artificial reefs had a KD value = 1.2.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.15246
      Issue No: Vol. 15, No. 2 (2022)
       
  • Pengaruh Bridge Simulator Karya PT. LEN Sebagai Industri Pertahanan Dalam
           Negeri untuk Meningkatkan Kompetensi Taruna AAL Korps Pelaut

    • Authors: Rahmat Alkadri, Basri Mustari, Agung Setiawan
      Pages: 199 - 203
      Abstract: The Indonesian Navy is a military force owned by the State of Indonesia. One of the main components of the Indonesian Navy is a warship (KRI). The role of the KRI in the implementation of the peak training of the jaya fleet is to carry out various ship formations which will later be used during operations. This study was conducted to describe the increase in the learning outcomes of Marine Corps AAL cadets on the use of the Bridge Simulator. The type of research used is Pre-experimental with One Group Pretest and Posttest Design. The research subjects were AAL cadets Level III and Level IV Marine Corps. The results of this study indicate the learning outcomes of cadets. Paired t-test data analysis using SPSS 25 for windows showed sig (2 tailed) 0.00 less than 0.05, which means H0 is rejected so that there is a significant increase in learning outcomes. The use of the Bridge Simulator can improve the learning outcomes of Marine Corps AAL cadets.

      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.14155
      Issue No: Vol. 15, No. 2 (2022)
       
  • Identification of Acne Vulgaris Type in Facial Acne Images Using GLCM
           Feature Extraction and Extreme Learning Machine Algorithm

    • Authors: Riyan Latifahul Hasanah, Yan Rianto, Dwiza Riana
      Pages: 204 - 214
      Abstract: Acne vulgaris or acne is a common inflammatory pilosebaceous condition that affects up to 90% of teenagers, begins during adolescent years, and often persists into adulthood. Acne vulgaris, especially on the face, has a major impact on the emotional, social and psychological health of patients. In treating acne, it is necessary to identify the exact type of acne. The manual method is considered less effective, so it is proposed an automatic method using a computer, which uses image processing techniques. This research was conducted to identify the types of acne on facial acne images. The methods used are K-Means Clustering for segmentation, Gray Level Co-occurrence Matrix (GLCM) for feature extraction, and Extreme Learning Machine (ELM) for classification. The dataset is 100 images and consists of 3 classes, namely Nodules, Papules and Pustules. Testing is done in two stages, namely testing 2 classes (Nodules and Papules), followed by testing 3 classes (Nodules, Papules and Pustules). Testing of 2 classes produces the highest accuracy of 95,24% and testing of 3 classes produces the highest accuracy of 80%.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.14580
      Issue No: Vol. 15, No. 2 (2022)
       
  • Aplikasi Metode Regresi Untuk Analisis Variabel Moderasi pada Personel
           Organisasi Militer

    • Authors: Adi Bandono, Sukmo Hadi Nugroho, Okol Sri Suharyo
      Pages: 215 - 222
      Abstract: The achievement of the vision, mission and also the target of a military institution is strongly influenced by soldiers or personnel who are human resource capital. In terms of human resources or personnel, of course, they have work motivation that must be maintained in order to survive in military organizations. Potential human resources and in accordance with their field of work will support the achievement of the organization if they are utilized optimally. This study aims to find answers about how the influence of organizational culture (X1) and job satisfaction (X2) on the work motivation of military personnel (Y) with work facilities as moderating variables (X3). The scientific method used in this research is survey research using a quantitative approach, the data analysis carried out in this study by analysis using statistical model tests. The results obtained in this study are (a) Organizational culture (X1) has a significant effect on work motivation (Y) in Institutions or Military Organizations, (b) Job satisfaction (X2) has a significant effect on work motivation (Y) in Institutions or Organizations. Military, and (c) Work facilities (X3) have a significant effect on work motivation (Y) in Military Institutions or Organizations. Based on the test results, it is also known that there is an effect of these variables after interacting with the work facilities variable as a moderating variable, the results obtained that have a significant effect on the work motivation of personnel. So it can be concluded that work facilities moderate organizational culture and job satisfaction so that it affects the increase in work motivation in military institutions or organizations.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.15505
      Issue No: Vol. 15, No. 2 (2022)
       
  • Analisis Tekno-Ekonomi Produksi Pupuk Cair Ramah Lingkungan dari Limbah
           Air Budidaya Ikan Berbasis Masyarakat

    • Authors: Nizar Amir, Hakam Muzakki, Hoomzah Nur Alisiyah, Raden Apriyanto
      Pages: 223 - 232
      Abstract: There are two important aspects of the implementation of this research, namely the technical aspect, which includes the production and analysis of the quality of liquid fertilizer products from fish farming wastewater, and the economic aspect, which includes an economic analysis on an industrial scale. Liquid fertilizer is made from fish farming wastewater obtained from Bangkalan Regency, East Java Province, Indonesia. The process of producing liquid fertilizer from fish farming wastewater includes various processes, from mixing to fermentation. The physical characteristics of liquid fertilizer from fish farming wastewater are in accordance with existing standards. Without the addition of nutrients, liquid fertilizer from fish farming wastewater has nitrogen (N) 1.33%, phosphorus (P) 0.44%, and potassium (K) 0.38%. Although the nutrient content of liquid fertilizer from fish farming wastewater is still below the standard of SNI 02-4958-2006, in industrial-scale production processes, adding nutrients is very necessary. In the economic analysis, all economic parameters are declared feasible and profitable, with an NPV value of Rp. 5,524,899,840, IRR 31,79%, PP 3.15 years and B/C ratio 3.1. This study shows a positive value on the technical and economic aspects. Finally, this research can be used as a reference by academics, government, and entrepreneurs in the technical and economic aspects of producing liquid fertilizer from fish farming wastewater.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.15494
      Issue No: Vol. 15, No. 2 (2022)
       
  • Pewarisan Karakter Kuantitatif Persilangan Tanaman Melon

    • Authors: Badriyah Badriyah, Achmad Amzeri
      Pages: 233 - 240
      Abstract: One of the efforts to solve the problem of limited quality melon seeds is to assemble melon varieties with distinctive fruit characters in terms of shape, taste, and color of the flesh. In general, farmers choose meon seeds that have a sweet taste, flesh color, large fruit size, and have a long shelf life. Analysis of quantitative character inheritance is very important in plant breeding programs. This analysis is used to obtain genetic information consisting of the number of genes controlling the character, gene action, genetic diversity, heritability and other genetic information. This study aims to study the inheritance pattern of several quantitative characters in melon crosses. The research design was a randomized block design with eight genotypes as treatment. The results showed that there was a maternal effect on the two crosses of melon plants G1 ((PK-669 x D-612) and G3 ((PK-361 x PK-165) on the characters of fruit diameter, fruit length, fruit weight, and leaf area. Heritability values in a broad sense on all parameters ranged from 0.95-1.00.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.15107
      Issue No: Vol. 15, No. 2 (2022)
       
  • Analisis Pemilihan Kapal Selam Dalam Memperkuat Postur TNI AL Menggunakan
           Metode Fuzzy dan Analytical Hierarcy Process

    • Authors: I Made Budi Wirawan, Syarif Mustika Harinurdi, Achmnad Faisol
      Pages: 241 - 246
      Abstract: Submarines of very strategic value in their procurement are directed to realize a deterrence strategy and a balancing strategy with state actors that have the potential to threaten the sovereignty of the Indonesian state. In addition to threats, the procurement of submarines also considers the geographical constellation of Indonesia. The first step in procurement is to make an analysis in terms of selecting alternative submarines, both analysis of information and identification of various important and interrelated requirements regarding data from alternative submarines that will be selected. In this condition, it can be solved by using fuzzy AHP approach. The results obtained from the Fuzzy AHP method are the order of priority for selecting alternative submarines, namely Scorpene Class (0.398), Changbogo Class (0.220), Reis Class (0.191) and Gotland Class (0.191). Where the results of the importance of the main criteria are sequentially starting from the Strategic Requirement (Strareq) criteria of 0.409, Operation Requirement (Opsreq) of 0.318 and Technical Requirement (Techreq) of 0.273.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.14334
      Issue No: Vol. 15, No. 2 (2022)
       
  • Karakter Kuantitatif Kandidat Melon Hibrida (Cucumis melo L.)

    • Authors: Halimatus Sa'diyah, Suhartono Suhartono
      Pages: 247 - 252
      Abstract: Characterization is the first step in breeding to obtain information about a plant's character. This study aims to determine the character of the hybrid melon candidate. The research was carried out in the experimental garden of the Agrotechnology Study Program, Trunojoyo University, Madura, from September to December 2021. The research used a randomized block design with treatment using six hybrid melon candidates (G1, G2, G3, G4, G5, and G6) and two comparison varieties (Envy and Action 434) with three replications. The results showed that Candidate G2 had higher values of fruit diameter, flesh thickness, number of seeds, and fruit weight than the two comparison varieties. The highest sugar content value is found in candidate G4, which is 13.80%. Heritability values in the broad sense of quantitative characters ranged from 0.62-0.98, and there were correlations between characters (positive and negative) between the observed characters.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.15130
      Issue No: Vol. 15, No. 2 (2022)
       
  • Pemilihan Multirole Maritime Patrol Aircraft Anti Kapal Selam dan Anti
           Kapal Permukaan Sebagai Benchmark Industri Pertahanan Udara

    • Authors: Eko Yulianto, Tunggul Puliwarna, Jumino Jumino
      Pages: 253 - 259
      Abstract: The Indonesian Navy (TNI AL) is required to have a persistently broad Maritime Domain Awareness (MDA). In meeting its MDA demands, apart from using the KRI Radar, the Indonesian Navy needs to be supported by other airborne surveillance sensors and sensing satellites in outer space. For airborne sensors, Puspenerbal has been equipped with a fleet of maritime patrol aircraft  (MPA) based on Casa NC 212-200 MPA and CN 235-220 MPA. However, all of these MPAs have a low detection capacity (<100 Km) and are not equipped with weapons to respond to threats on the surface or under the sea. For this reason, it is necessary to carry out research on the Long Range MPA requirement to support the tasks of the Navy with the aim of providing information and input to the Leaders in making decisions related to the plan to procure weapons and the strategic policies of the Navy to enforce defense and maintain security in the marine area of national jurisdiction. Indonesia This research will use the Analytical Hierarchy Process (AHP) method to determine the choice of maritime reconnaissance aircraft with predetermined criteria with alternative options, namely P-8A Poseidon, SAAB 6000 MPA, Kawasaki P-1, and ATR 72 MPA. The selected alternative was based on a combination of 3 criteria, namely P-8A Poseidon 58.3%, SAAB 6000 MPA 20.4%, Kawasaki P-1 14.4%, and ATR 72 MPA 6.8%. the result of the selection of the Tactical Reconnaissance Maritime Patrol Aircraft is that the P-8A Poseidon is the right alternative to choose. with an Inconsistency value of 0.06. This shows that the calculation of the alternative is still within the inconsistency threshold, which cannot be more than 0.1.
      PubDate: 2022-08-06
      DOI: 10.21107/rekayasa.v15i2.14153
      Issue No: Vol. 15, No. 2 (2022)
       
  • Karakter Kuantitatif Melon Generasi S0-S4

    • Authors: Siti Rohmatin, Kaswan Badami, Gita Pawana
      Pages: 260 - 266
      Abstract: One of the obstacles to melon cultivation is the availability of seeds and the high price of melon seeds. This condition causes the need to assemble superior melon varieties with the expected characters. This study aims to form a pure line of melon with certain superior characteristics and can be proposed as a new high-yielding variety in the open-pollinated category. The research was conducted at the Experimental Garden of the Agrotechnology Study Program, Faculty of Agriculture, Trunojoyo University, Madura, from September-December 2022. This study used a randomized block design method. The treatments used were nine pure lines of melon (PK-669, D-162, PK-361, PK-165, PK-114, D-029, D-5089, PK-211, and comparison). Each treatment was repeated three times, and each experimental unit consisted of 12 plants. Research data were analyzed using analysis of variance (ANOVA) and HSD test α = 0.05. The selection advancement was analyzed by comparing character data for each generation. The research showed that the results of the characterization of ten melon lines S0-S4 generation on the characters of fruit length, fruit diameter, flesh thickness, and melon fruit weight showed a decreasing trend in each generation. The S4 generation (9.17 °brix) in the character of the average sugar content there was an increase that was not significantly different from the S3 generation (9.03 °brix), while the number of seeds in each generation had an average value that was not significantly different but occurred an increase in the number of seeds in the S3 (372) and S4 (381) generations. An increase in one generation of the population in the linear regression equation is estimated to reduce the character of fruit length by 0.50 cm, fruit diameter by 0.465 cm, flesh thickness by 0.140 cm, fruit weight by 0.199 Kg, sugar content by 0.752 °brix, and a number of seeds by 5.4.
      PubDate: 2022-08-07
      DOI: 10.21107/rekayasa.v15i2.15109
      Issue No: Vol. 15, No. 2 (2022)
       
  • Pendekatan Uji Statistik Peminatan Prajurit Marinir dalam Mengikuti
           Pendidikan Brevet Intai Amfibi (Taifib)

    • Authors: Pamuharsi Pamuharsi, Untung Purnomo, Istin Marlena Dewi
      Pages: 267 - 274
      Abstract: According to the results of the brevet monitoring that has been carried out by the Department of Applied Psychology, the Subdiscipline of Applied Psychology on students of career NCO education and Private Private Career education, it is indicated that at this time the alumni of career NCO education and career Private Enlisted Officers lacked interest in attending education. This brevet can be seen from the number of soldiers who follow the brevet monitoring with the number of registrants when the opportunity is opened to take brevet education. This decline in interest occurred in all brevet education, and one of them was Taifib brevet education. Psychological aspects have a strong influence on interest, therefore researchers feel it is important to conduct research on the psychological aspects of the Marines Self Concept (X1) on interest in attending taifib brevet education and psychological aspects of emotion regulation (X2) on marine soldiers' interest in attending education taifib brevet (Y). The research method used in this study is a quantitative research method using the Classical Assumption Test. The results showed that Self Concept (X1) and emotion regulation (X2) simultaneously had no significant effect on the interest of marines in attending taifib brevet education (Y). attending taifib brevet education that self-concept and emotional regulation only affect 17% of marines' interest in attending taifib brevet education. Meanwhile, 83% of marines' interest in attending taifib brevet education is more influenced by other variables outside the study.

      PubDate: 2022-08-09
      DOI: 10.21107/rekayasa.v15i2.16212
      Issue No: Vol. 15, No. 2 (2022)
       
  • Pendekatan Structural Equation Modelling (SEM) dalam Operasi Logistik :
           Studi Kasus Operasi Amfibi TNI Angkatan Laut

    • Authors: Yahya Prasetyo, Marthin Luther, Etwin Ramadhan, Jumino Jumino
      Pages: 275 - 282
      Abstract: Along with the development of naval technology, the roles, tasks and functions of the support of the Motorized Transport Battalion (Yon Angmor) have the complexity and dynamics of movement in supporting the implementation of Amphibious Operations, which are very important and have high traffic. In this study, conducted to identify and analyze organizational readiness, readiness in the field of Operations as an element of Satbanmin, and the readiness in the field of Logistics as an element of Satbanmin in the implementation of Amphibious Operations. The results of the measurement using SEM AMOS 23 software from the measurement model of the three variables of operational readiness, organizational readiness and logistical support readiness that affect administrative assistance support, that the operational readiness variable produces the highest value of 0.566. This means that the implementation of the operational readiness of the Yon Angmor in supporting administrative assistance in Amphibious operations can be carried out optimally and according to SOPs, despite having obstacles and problems in organizational readiness. So, to answer the existing problems, the Yon Angmor needs to plan the formation of an organization through organizational validation, as well as calculating risk management in supporting administrative assistance in the implementation of comprehensive amphibious.
      PubDate: 2022-08-18
      DOI: 10.21107/rekayasa.v15i2.16420
      Issue No: Vol. 15, No. 2 (2022)
       
 
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