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Alfian Qomaruddin
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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 504 Documents
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Klasifikasi Diabetes Mellitus Menggunakan Support Vector Machine (Studi Kasus: Puskesmas Modopuro, Mojokerto) Andharini Dwi Cahyani; Ari Basuki
Rekayasa Vol 12, No 2: Oktober 2019
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v12i2.19763

Abstract

Diabetes Melitus (DM) merupakan salah satu penyakit dimana tubuh seorang pasien tidak dapat mengontrol tingkat konsentrasi gula (glukosa). Ada beberapa indikator kondisi tubuh pasien yang menunjukkan adanya penyakit diabetes. Pada penelitian ini dilakukan pengelompokan pasien DM dengan menggunakan metode Machine Learning. Algoritma yang digunakan adalah Support Vector Machine (SVM) yang merupakan metode klasifikasi supervised learning. SVM bekerja dengan membagi dataset menjadi 2 bagian dengan menggunakan garis linear (hyperplane) yang optimal. Target dari klasifikasi digunakan untuk memprediksi apakah pasien dengan indikator kondisi tubuh tertentu merupakan pasien DM yang terdeteksi atau tidak. Dari data yang diperoleh dari Puskesmas Modopuro, terdapat beberapa missing value. Pada penelitian ini, missing value diatasi dengan cara melakukan imputasi. Ada 3 kernel yang digunakan pada metode SVM, yaitu linear, polynomial, dan sigmoid. Pengukuran kinerja 3 jenis kernel tersebut akan menggunakan 5 subset cross validation. Nilai akurasi cross validation terbaik yang didapatkan menggunakan kernel linear, polynomial, dan sigmoid masing-masing yaitu 62%, 64%, dan 54%. Berdasarkan hasil pengamatan kernel polynomial mendapatkan hasil akurasi yang lebih baik dari kernel lainnya
Rancang Bangun Sistem Monitoring Arus, Tegangan, Kecepatan Putar Turbin dan Suhu Berbasis IoT Pada Pembangkit Listrik Tenaga Uap Mini Skala Laboratorium Muhammad Ibrahim Alfitroh; Humaidillah Kurniadi Wardana
Rekayasa Vol 16, No 1: April 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i1.16580

Abstract

The PLTU monitoring system developed in this study will be in the form of a monitoring system for temperature, current, voltage, turbine speed on a laboratory scale mini PLTU created using the blynk application and displayed on a smartphone. The research method used is in the form of testing a monitoring system comparing the prototype with standard gauges to determine the percentage of the measurement error, readings of type K and MAX6675 thermocouples, Lm393 sensors, DC voltage sensors, ACS712 sensors. The results of the measurement of the steam temperature sensor have an average percentage error of 0.03%, the turbine rotation sensor has an average percentage error rate of 0.01%, DC voltage sensor has an average error percentage rate of 0.07%, DC current sensors have an average percentage error rate of 0.10%.
Spatial-Temporal Variation of Land Use Changes In Ambon City Mohammad Amin Lasaiba
Rekayasa Vol 16, No 1: April 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i1.18799

Abstract

Changes in land use have caused various spatial consequences that occur substantially in an area. This study examines the pattern of land use changes from different room variations. The research was at a location in Ambon City. The materials in this study are Landsat 8 OLI/TIRS in 2010 and 2020, DEM SRTM, administrative maps, and development center maps. Research data were analyzed descriptively analytical, spatial, and temporal from the overlay results. The study results in show changes over ten years (2010-2020), indicating an increase in settlements covering an area of 23,810 ha per year. Differences in spatial variations based on administrative site, additional blocks in Sirimau District covering an area of 76,880 ha, and withdrawal of the most significant land in mixed gardens surrounding an area of 58,859 ha. In addition, there was additional weaponry on steep slopes (15 -30%) covering an area of 38,503 ha and a protected area of 16,505 ha by converting the use of forest land covering an area of 17,366 ha, and most of it took place in the city center. The addition of settlements also occurred in an accessibility (less than 3 km) area of 116,370 ha, most scattered in the secondary center of 86,520 ha.
Pengaruh Penambahan Chemical Agent Terhadap Angka Gula Reduksi Nira Perahan Pertama (NPP) Siska Nuri Fadilah; Reswara Musyafa; Lutfi Nanda Putri; Dirgantara Syahril; Achri Isnan Khamil; Maktum Muharja
Rekayasa Vol 16, No 1: April 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i1.17200

Abstract

One of the critical problems in the sugar industry is the high number of reducing sugars due to the inversion of sucrose in sugarcane due to the presence of Leuconostoc sp. This study aims to determine the effect and the optimum conditions for adding chemical agents to the number of reducing sugars in the first milking juice (NPP). The chemical agents used were benzalkonium chloride, sodium metabisulfite, and calcium hypochlorite with variations of 1, 2, 3, and 4 g/L. Analysis of reducing sugar (%GR) using the Lane-Eynon test method. The results showed that the addition of chemical agents had an effect on decreasing %GR of NPP, but at low doses there was an increase in %GR. The optimum point was reached when the addition of 3g/L benzalkonium chloride + sodium metabisulfite (BKC+SMB) was able to reduce %GR up to 2.16%. This condition has the potential to provide a net profit of sugar production of ±Rp. 14,056,000.00 per day. The use of BKC+SMB is a solution to reduce the number of reducing sugars and increase the yield value of the sugar industry.
Rekomendasi Pemilihan Supplier pada UMKM Produsen Tas menggunakan metode AHP – PROMETHEE Ari Basuki; Andharini Dwi Cahyani
Rekayasa Vol 12, No 2: Oktober 2019
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v12i2.19764

Abstract

UD Sumber Rejeki merupakan UMKM yang memproduksi tas handbag sebagai produk utama. Dalam proses produksi, salah satu kendala utama yaitu keterlambatan bahan baku. Keterlambatan bahan baku diakibatkan oleh kesalahan dalam pemilihan supplier. Pemilihan supplier merupakan salah satu faktor penting berjalannya sebuah perusahaan. Ketika bahan baku sudah terpenuhi dengan baik, maka proses produksi bisa berjalan. Pemilihan supplier memerlukan kriteria dalam mendukung keputusan di dalamnya. Maka dari itu digunakan metode AHP dalam menentukan kriteria dan bobot di dalamnya. Dan digunakan metode PROMETHEE untuk mendapatkan perangkingan hasil kinerja supplier. Didapatkan dari lima supplier langganan, Supplier yang menjadi rekomendasi kepada UD Sumber Rejeki adalah supplier dengan kinerja terbaik yang sudah dinilai dengan AHP dan PROMETHEE. Supplier tersebut adalah supplier 3 (Aini) dengan nilai net flow sebesar 0,5438, S2 (Prima) sebesar 0,4099, S4 (Akbar) sebesar 0,0438. Ketiga supplier ini merupakan supplier prioritas yang diusulkan kepada UD Sumber Rejeki dan Supplier 3 memiliki kinerja terbaik yang akan dijadikan prioritas utama.
Studi Pemanfaataan Teknologi Hydrogen Fuel Cells (HFCs) pada Kapal Peti Kemas Muhammad Dihan Ramadhan Pradana; Setyo Nugroho; Eka Ardhi
Rekayasa Vol 16, No 1: April 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i1.16269

Abstract

International Maritime Organization has previously issued an ambitious strategy to decrease maritime carbon emission by by 70% in 2050. There are lots of alternatives in reducing carbon emission, with hydrogen fuel cells being one considered. Hydrogen fuel cells (HFCs) is projected to decrease maritime carbon emission up to 80% and has larger engine efficiency, roughly 10-20% higher than of diesel engine. In this research, feasibility analysis of HFCs was conducted through life cycle analysis and simple additive weighting by considering 4 types of fuel (green/blue/gray hydrogen and LNG) and 3 types of HFCs (PEMFC, MCFC and SOFC). Life cycle analysis showed that combination of Solid Oxide Fuel Cells and blue hydrogen came out as the best solution to reduce carbon emission up to 82% for hybrid-powered vessels. From financial perspective however, hybrid-engine option may reduce overall gross income by 27% since it requires higher engine space. Furthermore, utilization of fuel cell resulted in a lower net present value as a result of higher investment cost compared to diesel-powered vessels.
Bakteri Bacillus Sebagai Agen Kontrol Hayati dan Biostimulan Tanaman Arkan Setiaji; Raden Roro Rifka Annisa; Deris Trian Rahmandhias
Rekayasa Vol 16, No 1: April 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i1.17207

Abstract

One of the long-term constraints in agricultural productivity is the dependence of farmers on synthetic pesticides. The application of pesticides has a negative impact on ecosystems and human health. Utilization of microorganisms such as bacteria Bacillus as a biological control agent is an alternative to reduce the use of synthetic pesticides. A simpler discussion of the interaction between Bacillus and plants is important to carry out. This article aims to review the mechanism of the role of Bacillus as a biological control agent and growth stimulant in plants. Bacillus is a genus of bacteria that can be used as biological control agents because it is adaptive, capable of forming endospores and tolerant of various environmental conditions. These properties are advantageous in competition with phytopathogens through an antibiosis mechanism in the form of toxin production. Bacillus infection of plants is able to stimulate the emergence of systemic resistance as an initial defense mechanism in plants. Bacillus associated with plants can provide a growth stimulation effect because the metabolites produced are able to trigger the sensitivity of the root system for nutrient absorption and stimulate the regulation of growth regulators such as the synthesis of auxin, gibberellins, and cytokinins. Based on these reviews, the use of based biological agents and biostimulants Bacillus is expected to be able to support global efforts to achieve sustainable development targets, especially in the agricultural sector
Pengendalian Kualitas Produk Downlight dengan Implementasi Simulasi Die Casting Trio Yonathan Teja Kusuma; Gunawan Budi Susilo; M Zulhan Iswanda
Rekayasa Vol 16, No 1: April 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i1.18839

Abstract

Die casting is a casting process in which molten metal is poured into a mold by injection using a piston driven by pneumatic/hydraulic energy. In some cases, the resulting product does not match the desired design because defects will occur if the configuration is not correct. There are several defects that commonly occur in the Die casting process such as cold shot, shrinkage, bubble, warping, undercut, etc. With the help of computers, these problems are expected to be reduced. Using inspire cast to visualize the injection process will facilitate the analysis of the Die casting process. With the help of this software, a better configuration can be created and implemented into the machine. However, the results are different, when simulating in the software it is said that the molten metal streams from different gates are above the recrystallization temperature of 665°C so it should harden and fuse better when the two molten metal streams meet. However, after implementing the new configurations into the machine, the process defects were still high at 23% for configuration 1 and 13% for configuration 2 compared to 6% for the existing configuration. However, implementing this software will reduce the cost of trial and error process to find a new configuration for a new material.
Metode Line Balancing Heuristik untuk Penyeleseian Masalah Terjadinya Bottleneck pada Lintasan Produksi Ari Basuki; Andharini Dwi Cahyani
Rekayasa Vol 13, No 3: December 2020
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v13i3.19765

Abstract

Meningkatnya jumlah Work In Process (WIP) pada lantai produksi atau bottleneck merupakan salah satu permasalahan yang bisa menyebabkan terjadinya keterlambatan suplai produk kepada konsumen. Dampak lain dari terjadinya bottleneck yaitu dapat menyebabkan penumpukan bahan baku setengah jadi pada lantai produksi sehingga WIP menjadi tinggi. Kondisi ini merupakan kondisi merugikan yang harus dihindari oleh perusahaan. Tujuan dari penelitian ini adalah memberikan usulan perbaikan pada permasalahan terjadinya bottleneck di lintasan produksi dengan menggunakan beberapa metode line balancing heuristik, yaitu metode Helgesson-Birnie / Ranked Positional Weight (RPW), metode Region Approach, metode Largest Candidate Rule dan metode J-Wagon yang diterapkan di perusahaan manufaktur (PT.’X’) yang memproduksi pallet. Hasil penelitian diketahui bahwa pada penerapannya metode J-Wagon terpilih sebagai metode yang paling optimal diantara metode lainnya tersebut. Rekomendasi untuk PT.’X’ dalam mengatasi permasalahan bottleneck yaitu dengan pembentukan stasiun kerja yang awalnya memiliki jumlah 5 stasiun kerja diubah menjadi 4 stasiun kerja. Ini menghasilkan perbaikan lini lintasan kerja yang awalnya memiliki line efficiency sebesar 69%, balance delay sebesar 31%, smoothness index sebesar 9.22 dan total waktu menganggur sebesar 3.60 menit menjadi line efficiency sebesar 86%, balance delay sebesar 14%, smoothness index sebesar 0.80 dan total waktu menganggur sebesar 1.28 menit.
Pengaruh Konsentrasi Gula Terhadap Karakteristik Fisika, Kimia dan Aktivitas Antioksidan Teh Kombucha Daun Belimbing Wuluh (Avverhoa bilimbi Linn.) Fanny Fajrin Aulia Rosyada; Eva Agustina; Hanik Faizah
Rekayasa Vol 16, No 1: April 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i1.16977

Abstract

One of the fermented traditional drinks that can have a health effect is kombucha. The materials that can be used in making kombucha is wuluh starfruit leaves. The research was conducted to determine the effect of sugar concentration of the physical, chemical characteristic, and antioxidant activities of wuluh starfruit leaf kombucha tea. This research is an experimental study with a complete randomized design method (CRD) consisting of 3 treatments. Kombucha wuluh starfruit leaves are made with a sugar concentration of 10%, 15% and 20%. The physical characteristics tested include organoleptic tests and the chemical characteristics include a test of the pH value, the total levels of titrated acids (tat), phenolics statistically  analyzed  using  the Kruskal Wallis test and the Mann Whitney test. The alcohol data and antioxidant activity (IC50) were analyzed descriptively. The results of the Kruskal Wallis test  have a significant difference in the pH. The best result based on the physical, chemical characteristic and antioxidant activity is were kombucha with a sugar concentration of 10% with a pH value of 3, a tat content of 0.11%, a phenolic content of 87.33 mg/ml GAE, an alcohol content of 0.41% and an IC50 value of 3.65 ppm.

Page 38 of 51 | Total Record : 504

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