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Alfian Qomaruddin
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rekayasa@trunojoyo.ac.id
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Universitas Trunojoyo Madura Jl. Raya Telang - Kamal, Bangkalan Kode Pos 69162
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INDONESIA
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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Normalization based Multi-Criteria Collaborative Filtering Approach for Recommendation System Noor Ifada; Nur Fitriani Dwi Putri; Mochammad Kautsar Sophan
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.v13i3.8545

Abstract

A multi-criteria collaborative filtering recommendation system allows its users to rate items based on several criteria. Users instinctively have different tendencies in rating items that some of them are quite generous while others tend to be pretty stingy.  Given the diverse rating patterns, implementing a normalization technique in the system is beneficial to reveal the latent relationship within the multi-criteria rating data. This paper analyses and compares the performances of two methods that implement the normalization based multi-criteria collaborative filtering approach. The framework of the method development consists of three main processes, i.e.: multi-criteria rating representation, multi-criteria rating normalization, and rating prediction using a multi-criteria collaborative filtering approach. The developed methods are labelled based on the implemented normalization technique and multi-criteria collaborative filtering approaches, i.e., Decoupling normalization and Multi-Criteria User-based approach (DMCUser) and Decoupling normalization and Multi-Criteria User-based approach (DMCItem). Experiment results using the real-world Yelp Dataset show that DMCItem outperforms DMCUser at most  in terms of Precision and Normalized Discounted Cumulative Gain (NDCG). Though DMCUser can perform better than DMCItem at large , it is still more practical to implement DMCItem rather than DMCUser in a multi-criteria recommendation system since users tend to show more interest to items at the top list.
Analisis Indeks Kesesuaian Lokasi Garam (IKG) di Kawasan Sentra Produksi Garam Jawa Timur Andi Kurniawan; Riski Agung Lestariadi; Rika Kurniaty; Tri Budi Prayodo; Citra Satrya Utama Dewi; Abd Aziz Amin; Adi Tiya Yanuar; Lutfi Ni'matus Salamah
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.v13i3.9130

Abstract

Salt is an essential commodity that is widely used for consumption and industrial purposes. One of the main factors determining the success of this salt production is the suitability of the salt production location. However, there has been no analysis of the suitability of salt production locations in salt production centers in East Java. This study aims to analyze the suitability level of the location of salt production centers for the salt production process using the Salt Location Suitability Index (IKG). The areas analyzed in this study are salt production centers in Sampang Regency, Probolinggo Regency, Gresik Regency, and Tuban Regency. The IKG analysis is prepared based on nine suitability parameters: rainfall, soil permeability, soil type, duration of exposure, humidity, wind speed, air temperature, evaporation rate and saturation level of raw material water. The IKG analysis results can also be used as a basis for recommending alternative technologies that need to be applied to increase salt production. The results of this study indicate that the locations of salt production in Sampang District, Probolinggo Regency and Tuban Regency, which are the focus of this study, are in the Very Appropriate category (more than 85%), while the locations in Gresik Regency are in the Sufficiently Suitable category (80-84 %). Based on the results of this study, all the locations that are the focus of this study are suitable for further development of salt production.
Identifikasi Acute Lymphoblastic Leukemia pada Citra Mikroskopis Menggunakan Algoritma Naïve Bayes Syidada, Shofiya; Hariyanto, Bagus
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.9110

Abstract

Leukemia is a type of blood cancer that occurs when the body overproduces abnormal white blood cells. Acute Lymphoblastic Leukemia (ALL) is a type of acute leukemia. ALL occurs when the spinal cord is excessively producing young lymphocytes, known as lymphoblasts. Leukemia is difficult to detect because it has the same symptoms as other diseases. One way to detect leukemia is to use a complete blood count test. Blood count test is done by calculating the population of red blood cells, white blood cells and platelets. The health condition of the body is indicated by the number of each blood cell. The small number of erythrocyte and abnormal cell shape is indicative of leukemia. How to identify leukemia still using a microscope. In this study the researchers made a way of identifying acute lymphoblastic leukemia cells by image processing, include cropping, segmentation, feature extraction and identification. The method used in image identification is Naïve Bayes Classifier (NBC). NBC is a classification method which applies simple probability calculations using Bayes theorem. The white blood cell image tested using this application will be evaluated with accurations. The greatest accuracy results from several test scenarios obtained 80% accuracy.
Analisis Performa Mata Uang Virtual (Cryptocurrency) Menggunakan Preference Ranking Organization Method For Enrichment Evaluation (Promethee) Farida, Yuniar; Khasanah, Zhara Shafira Uswatun
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.8793

Abstract

Cryptocurrencies are among the inventions that have caused a stir in the economy of late. Because in its use there are still pros and cons of various countries. Some countries reject the use of cryptocurrencies and others support the use of cryptocurrencies because it is considered a modernization of payment tools. Besides being used for payment instruments, cryptocurrencies can also be one of the options to invest. The number of cryptocurrencies that exist causes investors to be observant in making the right choices. In this study, the Promethee method was used I and II to determine the rank of 7 virtual currencies. Promethee I is a partial assessment method while Promethee II is a complete assessment method. The data used for ranking is obtained from the questionnaire "sentiment on the performance of cryptocurrencies". The results of the cryptocurrency performance analysis showed that the investment commodity of the most recommended in a row is Bitcoin with a net flow value of 0.33267, Cardano 0.14267, Ethereum 0.04800, Ripple 0.04733, Stellar -0.04733, Litecoin -0.04767 and Dogecoin -0.47567.
Klasifikasi Gerakan Tangan Menjadi Suara Menggunakan Neural Network Muhammad Arifan Lizamanihi; Ii Munadhif; Mohammad Abu Jami'in
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.v13i3.6614

Abstract

Rancang Bangun dan Uji Kinerja Mesin Bead Roller untuk Perbaikan Bodi Kendaraan Wisnujati, Andika; Yusuf, Mirza
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.10092

Abstract

In developing the 4.0 industrial revolution era, vehicle body repair manufacturing companies are required to carry out technological innovations to support effective and efficient performance. One way is in the metal forming process, namely by changing the metal's shape into a variety of products by the company to increase the selling value of the material. The method of forming metal or these materials uses a bead roller machine with a compressive force to carry out the forming process on sheet metal plates according to the size of the tools' geometry and shape. The design of this bead roller machine is operated by using an electric motor with a power of 0.5 HP, using an Alternating Current (AC) voltage, the thickness of the iron frame dimensions of 1.2 cm, and using a reducer with a ratio of 1: 100. Selection of engine parts such as shafts, bearings, tools, and sprockets using materials that are economical and easy to obtain. The design uses Autocad 2014 Software, starting with designing a bead roller machine design paying attention to the strength of the materials used, then assembling the components and the machine's electrical system. The result of this design will be displayed by performing the bead roller machine performance. This bead roller can increase work productivity efficiently and effectively concerning sheet metal media for vehicle body repair compared to manual roll bending tools.
The Effect of Sunglint Correction for Estimating Water Depth Using Rationing, Thresholding, and Mean Value Algorithms Prayogo, Luhur Moekti; Basith, Abdul
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.8698

Abstract

Satellite-Derived Bathymetry (SDB) is an alternative for obtaining shallow water depth data. The existence of images with various resolutions, the availability of a complete image band can develop the extraction results. This method is based on the principle of the satellite's visible band to estimate water depth. The mapping of shallow water depth is dependent on water conditions, both its brightness and surface. When the sensor senses a water object, the reflected reflection comes from the surface, and some sensors cannot penetrate the water object. The sun's position and the sensor's point of view when sensing it results in interference from the water surface (Sunglint). The sunglint effect on the image can be reduced by performing RGB band correction with NIR Infrared. This study aims to demonstrate the effect of Sunglint's correction on three SDB approaches, namely Thresholding, Rationing, and Mean Value on Worldview 3 imagery in Karimunjawa Islands, Central Java. This study's results indicate that the Sunglint correction on Worldview 3 imagery affects the depth extraction results. The best results are shown by Sunglint's correction using the Thresholding approach (B2-B7), which produces the best correlation with R2 of 0.7364 and (B7-B2) with R2 = 0.7351. Contrastingly, the lowest correlation was generated using the Mean Value ((B2 + B7) / 2) approach without Sunglint's correction with R2 = 0.4015. So this research proves that the Worldview 3 image with Sunglint correction can provide bathymetry data, especially in shallow waters.
Pemetaan Kesesuaian Perairan untuk Budidaya Laut di Perairan Pesisir Kabupaten Situbondo dan Banyuwangi Jawa Timur Zainul Hidayah; Apri Arisandi; Maulinna Kusumo Wardhani
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.v13i3.9858

Abstract

Pemilihan lokasi merupakan langkah awal untuk penentuan kegiatan perikanan budidaya laut yang berkelanjutan.  Dokumen Rencana Zonasi Wilayah Pesisir dan Pulau-Pulau Kecil (RZWP3K) Provinsi Jawa Timur menyebutkan bahwa kawasan pesisir dan laut yang berada di perairan Selat Madura dan Selat Bali, terutama pesisir Kabupaten Situbondo dan Banyuwangi dialokasikan sebagai wilayah pengembangan budidaya laut. Penelitian ini bertujuan untuk menganalisa karakteristik kondisi perairan Kabupaten Situbondo dan Banyuwangi, khususnya mengenai kelayakan sebagai lokasi budidaya laut. Penelitian ini dilaksanakan pada bulan Juni sampai dengan Juli tahun 2020. Pengambilan data sample air laut dilakukan di  titik pengamatan yang tersebar di 15 kecamatan pesisir di Kabupaten Situbondo (Selat Madura) dan Banyuwangi (Selat Bali dan Samudera Hindia). Metode yang digunakan adalah dengan menganalisis parameter kualitas perairan dan menghitung nilai indeks kesesuaian. Selain itu dilakukan pula pendugaan besarnya beban limbah dan analisis komponen utama. Hasil penelitian dapat disimpulkan bahwa lokasi yang sesuai untuk pengembangan budidaya laut di Kabupaten Situbondo terletak di Kecamatan Suboh, Kendit, Arjasa dan Jangkar dengan nilai indeks kesesuaian berkisar antara 63,5-67,5. Sementara untuk Kabupaten Banyuwangi, kawasan yang sesuai untuk pengembangan budidaya laut terletak di Kecamatan Wongsorejo dan Muncar dengan nilai indeks antara 64 – 68.5. Estimasi beban limbah menunjukkan bahwa potensi limbah yang terjadi akibat budidaya laut dengan KJA adalah sekitar 0,24 ton N/10 unit karamba. Hasil perhitungan analisis komponen utama menunjukkan stasiun pengamatan memiliki karakteristik nilai parameter kualitas air yang beragam.
Densitas dan Morfologi Stomata Daun Pterocarpus indicus di Jalan Arif Rahman Hakim dan Kampus ITS, Surabaya Dhimas Wildan Humami; Puput Anggie Widhiarti Sujono; Iska Desmawati
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.v13i3.7869

Abstract

The relationship between physiological and environmental factors can affect the anatomical structure and morphology of stomata as organs that important to exchange carbon gas, oxygen, and water vapor as well as organs that are directly exposed to polluted environments that can inhibit the photosynthesis process of plant leaves. The purpose of this study was to determine differences in stomata density and morphology of  Pterocarpus indicus leaves at locations suspected of having high pollution exposure and low pollution exposure. This study uses the leaf of Pterocarpus indicus as a type of plant that is often exposed to pollution. The leaf sampling method was carried out with 3 replications in the area of Arif Rahman Hakim Street and Taman Benzena, ITS Surabaya as a comparison of areas estimated to have high and low pollution exposure. Sampling using the abaxial side of the leaf by using the imprint method. Calculation of density is done by unit mm2 of leaf area under normal, closed, and abnormal stomata morphological conditions. The results obtained from the observation of stomata density in Taman ITS Benzena Surabaya are 32,502 stomata/mm2 were opened, 65,004 stomata/mm2 closed, and 13,630 stomata/mm2 abnormal, while in the area of Arif Rahman Hakim Street, Sukolilo, Surabaya as a sample location assuming the pollution is 46,132 stomata/mm2 were opened, 78,634 stomata/mm2 closed and 13,630 stomata/mm2 abnormal.
Pembuatan Pupuk Organik Cair dari Urine Kambing Jawa Randu dan Sampah Organik Rumah Tangga Fahlevi, Agam Yogi; Purnomo, Zusuf Tri; Mulia Shitophyta, Lukhi
Rekayasa Vol 14, No 1: April 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i1.7560

Abstract

Waste from processed household activities that do not experience good management can cause environmental pollution. The rubbish in the form of vegetable and fruit waste still contains waste that can be further processed to be more useful. Liquid organic fertilizer is fertilizer whose basic ingredients come from animals, plants, or both that have undergone a process of fermentation and its final form is liquid. The making of liquid organic fertilizer from javanese goat urine and household organic waste with the addition of EM4 bioactivators (effective microorganisms) aims to determine the effect of fermentation time length, the effect of adding EM4 bioactivators, and the effect of adding the javanese goat urine with household organic waste compared to household organic waste without the addition of javanese goat urine to the pH, N, P, and K contents in liquid organic fertilizer. The results showed that for the analysis of pH obtained in samples of 4.5 to 8.5, while for the analysis of nitrogen, phosphorus, and potassium the best nitrogen (N) content was 2.3672% in 10 mL EM4 samples with a fermentation time of 21 days. The best phosphorus (P) content was 0.6857% in the 15 mL EM4 samples with a fermentation time of 14 days. And the best potassium (K) content was obtained at 1.0559% in the EM4 samples of 10 mL with a fermentation time of 7 days.

Page 27 of 51 | Total Record : 504

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