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Alfian Qomaruddin
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Universitas Trunojoyo Madura Jl. Raya Telang - Kamal, Bangkalan Kode Pos 69162
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REKAYASA
Published by Universitas Trunojoyo Madura
ISSN : 02169495     EISSN : 25025325     DOI : https://doi.org/10.21107/rekayasa
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering Physics
This journal encompasses original research articles, review articles, and short communications, including: Science and Technology, In the the next year publication, Rekayasa will publish in two times issues: April and Oktober.
Arjuna Subject : -
Articles 17 Documents
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Search results for , issue "Vol 15, No 3: Desember 2022" : 17 Documents clear
Reduksi Kadar Oksalat dalam Umbi Porang Menggunakan Variasi Konsentrasi, Suhu dan Lama Perendaman dalam Larutan NaCl dan Akuades Febrianti, Evril Pramestari; Wardani, Ratih Kusuma
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16804

Abstract

Porang tubers contain compounds that have been widely used in health and industry, namely glucomannan. In addition, porang tubers also contain oxalate compounds that cause itching and burning when consumed directly. Porang tubers that have been cut with a size of 2x2 cm and a thickness of 0.5 cm are soaked using a solution of NaCl and distilled water. Immersion is used to reduce oxalate levels with variations in concentration, temperature and immersion time. Soaking porang tubers in either NaCl or distilled water can reduce oxalate levels. NaCl solution with a concentration of 7% has the highest % decrease in oxalate levels, which is 69.83%. NaCl solution has a better ability to reduce oxalate levels compared to distilled water. The immersion time of porang tubers with NaCl solution for 45 minutes had lower levels of oxalate than using distilled water for 60 minutes, namely 1.0809% (w/w). Porang tubers soaked in NaCl solution at a temperature of 60°C obtained a higher % decrease in oxalate levels compared to distilled water at the same temperature, which was 55.58%.
Analisis Environmental-DNA (E-DNA) Untuk Estimasi Jumlah Total Bakteri Pada Air Kolam dengan Sistem Recirculation Aquaculture System (RAS Kurniawan, Andi; Amin, Abd. Aziz; Guntur, Guntur; Susanti, Yogita Ayu Dwi; Wiryawan, Adam; Pramudia, Zulkisam; Okuda, Hideki; Yanuar, Adi Tiya
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.16844

Abstract

Catfish is an aquaculture commodity that has great potential to be developed in various regions in Indonesia. The success of catfish cultivation is primarily determined by creating a suitable environment for catfish. One way to create a suitable environment for catfish cultivation is the Recirculation Aquaculture System (RAS). In applying RAS, the presence of organic matter in the pond is controlled so the pond water can be reused. The presence of organic matter in pond water is determined mainly by the activity of bacteria in the water. These bacteria are actively involved in the pond's residual organic matter degradation process. Therefore, the total number of bacteria in the water can be one of the essential parameters in the RAS. The method widely used to calculate the abundance of bacteria is counting the number of bacteria based on bacterial culture method. However, the bacteria that can be cultured are only a small part of the bacteria in the water, so the abundance value obtained does not reflect the actual bacterial population. Therefore, it is necessary to analyze the abundance of bacteria using a method closer to the actual abundance value, such as the environmental DNA (eDNA) analysis. This study aims to analyze the abundance of bacteria in water in catfish aquaculture with RAS using the eDNA method. In addition, this study also analyzes water quality data (temperature, pH, Dissolved Oxygen). This study's results indicate that the water temperature value in catfish ponds ranges from 28.0 to 29.0 °C, the average pH value is 7.7, and the dissolved oxygen is between 5.7 - 6.2 mg/L. The water quality analysis results indicate that RAS can maintain optimum conditions in the catfish cultivation process. This study also showed that the total microbial abundance value at the beginning of cultivation was 1.68 × 107 cells/ml, and on day 30, it was 3.6 × 106 cells/ml. The dynamic of bacterial densities in this study may indicate that this system can maintain the stability of the microbial community. 
Implementation of a Digital-Based Early Safety Warning System Program on a Branch Logistics Company in Jakarta Hamidya, Syifa Ula; Ardyanto, Yustinus Denny; Paskarni, Indriati
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.18381

Abstract

Lack of involvement in interventions to carry out observations and analysis that causes the conditions and behavior of employees at one of the logistics companies at the Jakarta branch. The research aims to reduce potential unsafe of conditions unsafe actions in the workplace environment. This process involves employees recognizing potential problems in the workplace within the procedures of observation, feedback, and employee behavior interventions. The methodology used in this study is a descriptive method to describe present or ongoing issues. This method allows for assessing a condition and program implementation to make further improvements in the future. There are still several obstacles in implementing the K3 Program (Safety, Health, and Environment), where the program is still being performed manually. BBS STAR program does not cover unsafe conditions and unsafe actions, so reporting workers to management regarding conditions at work still not optimal yet. Employees also have some difficulty reporting unsafe conditions and unsafe actions in the workplace. SEWS program can be a preventive step in the occurrence of potential danger. The quality of employees could increase with the habit of analyzing dangerous aspects of the workplace environment. Employees' involvement in the SEWS contribution program can also help establish moral consistency.Keywords: K3, Unsafe conditions and unsafe actions, SEWS Program
Model Penilaian Strategi Pertahanan Matra Laut Negara Kepulauan Berbasis System Dynamic Martin, Richard; Laksono, Amin Setyo; Riniwati, Harsuko; Widagdo, Setyo
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.15465

Abstract

The maritime dimension defense strategy model is a part of the Archipelago Marine Defense Strategy, referring to the dynamics or developments in the strategic environment and the capabilities of available national resources. In carrying out an assessment of the defense strategy of the archipelagic nation's sea dimension, it is determined by the influence and interaction of interrelationships between balancing aspects of Naval Forces and Integrated Fleet Weapons Systems (SSAT) with Threat aspects as a complex system, so an analysis is needed to get a value on the assessment defense strategy of the maritime dimension of the archipelagic state, which consists of aspects of developing the strength of the Navy and aspects of Potential Threats. So it needs to be compiled in a dynamic model that can represent a value in the assessment of the marine defense dimension of the archipelagic nation which is projected based on the time dimension up to the next 15 years. In this research, the researchers compiled a system dynamic model approach to obtain an assessment of the value of each variable and sub-variable. The results of the formulation and simulation model on the assessment of the sea dimension defense strategy, obtained values based on the following strategic scenarios: (1) Fleet In Being defense strategy at an index value of 5.72, (2) Blockade defense scenario 5.72, (3) Defense scenario Decesive Battle 5.73, (4) combined scenario between fleet in being and blockade 5.72, (5) combined scenario of fleet in being and decesive battle 5.78, (6) combination scenario of blocakde and decesive battle 5.73 and value sea defense based on current SSAT capabilities in the 15th year of 5.9, included in the alert category/quite safe.
Presensi Wireless Otomatis menggunakan Face Recognition Adiputra, Firmansyah; Umam, Faikul
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.19762

Abstract

Presensi adalah sebuah daftar yang digunakan untuk mencatat kehadiran seseorang serta tingkat kedisplinan dari anggota dalam suatu instansi, institusi atau perusahaan. Sistem yang digunakan dalam presensi juga mengalami banyak perkembangan yakni mulai dari sistem presensi yang memakai kertas, sistem mesin check clock, sistem smart cards (RFID), hingga sistem yang paling terbaru ialah sistem presensi biometrik (fingerprint recognition, retina recognition, dan face recognition). Dalam penelitian ini, sistem yang digunakan pada alat presensi adalah salah satu dari sistem biometrik yaitu sistem face recognition. Hal ini, dikarenakan sistem biometrik face recognition dinilai paling efektif dari pada menggunakan sistem presensi lainnya dan juga untuk meminimalisir kecurangan dalam presensi, seperti titip tanda tangan dan titip kartu. Sebelum proses pengenalan wajah dilakukan, terdapat proses deteksi wajah atau face detection yang akan terlebih dahulu mengindikasikan bahwa dalam gambar tersebut terdapat wajah manusia atau tidak. Untuk melakukan hal tersebut face detection memerlukan sebuah metode, yakni Skin Color Segmentation yang dapat memberikan indikasi secara spesifik pada sebuah gambar atau image, dengan cara mengidentifikasi jumlah pixel yang ada dalam persegi saja dan bukan nilai setiap pixel yang ada pada keseluruhan image. Kemudian hasil dari proses face detection ini, akan diolah untuk proses face recognition, yang mana dalam proses ini juga memerlukan metode yakni Principal Component Analysis (PCA).
PEMETAAN HARGA RUMAH DENGAN MENGGUNAKAN MODEL STATISTIK : GEOGRAPHICALLY WEIGHTED REGRESSION Winarso, Kukuh; Dafid, Achmad
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.21818

Abstract

Penentuan harga rumah di sebagian kota-kota besar di Indonesia dipengaruhi oleh banyak faktor, salah satunya adalah lokasi rumah. Lokasi rumah menunjukkan hubungan yang positip dengan harga rumah. Lokasi rumah dekat dengan pusat bisnis adalah salah satu hal yang menyebabkan harga rumah menjadi mahal. Disamping itu pusat pemukiman berdasar kepadatan penduduk di satu sisi menyebabkan harga rumah menjadi naik pada posisi yang lain menyebabkan harga rumah menjadi turun. Penelitian ini berbasis pada pemetaan harga rumah yang dipengaruhi oleh pusat bisnis dan pusat pemukiman penduduk dikota Surabaya. Pemetaan Harga rumah ini menggunakan metode Geographically Weighted Regression (GWR). adalah suatu teknik yang membawa kerangka dari model regresi sederhana menjadi model regresi terboboti.
Daya Gabung dan Heterosis Melon Hibrida pada Ketahanan terhadap Powdery Mildew dan Produksi Tinggi Amzeri, Achmad; Hidayah, Nur
Rekayasa Vol 15, No 3: Desember 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i3.26123

Abstract

Evaluasi nilai daya gabung umum (DGU), daya gabung khusus (DGK), heterosis dan heterobeltiosis dibutuhkan untuk menentukan arah program pemuliaan tanaman. Penelitian ini bertujuan untuk mengevaluasi daya gabung dan heterosis komponen hasil tanaman melon hibrida pada persilangan diallel lengkap untuk memilih melon hibrida yang mempunyai sifat tahan terhadap penyakit powdery mildew dan produksi tinggi. Penelitian dilakukan di Kabupaten Pamekasan-Madura, Indonesia. Penelitian meng gunakan Rancangan Acak Kelompok dengan 25 genotip sebagai perlakuan dan diulang sebanyak 3 ulangan, sehingga terdapat 75 unit percoban.  Genotip yang digunakan adalah 25 genotip hasil persilangan dialel lengkap, yaitu : 5 penyerbukan sendiri tetua, 10 tanaman F1 dan 10 tanaman F1 resiprok. Parameter pengamatan adalah infeksi tingkat daun, tingkat infeksi tanaman, tingkat infeksi populasi, dan bobot buah. Pendugaan daya gabung umum (DGU), daya gabung khusus (DGK) dan heterosis diperoleh dari analisis dialel menggunakan pendekatan Griffing metode I.  Hasil penelitian menunjukkan bahwa Karakter tingkat infeksi daun dan bobot buah dikendalikan oleh oleh aksi gen aditif sedangkan untuk karakter tingkat infeksi tanaman dan tingkat infeksi populasi dikenndalikan oleh aksi gen dominan.  Pengaruh ekstrakromosomal terjadi pada karakter tingkat infeksi populasi dan bobot buah.  Galur 1 (PK165), galur 3 (PK464) dan 5 (PK667) mempunyai DGU tinggi pada karakter bobot buah sehingga bisa digunakan untuk merakit varietas hibrida berdaya hasil tinggi atau digunakan sebagai varietas unggul bersari bebas. Persilangan 1(PK165) x3(PK464), 2 (PK176)x5(PK667), 3(PK464)x1(PK165), dan 3(PK464) x5(PK667) adalah hibrida yang mempunyai nilai DGU, DGK, heterosis dan hetrobeltiosis tinggi pada karakter bobot buah, tingkat infeksi daun, tanaman dan populasi.

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