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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.
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Articles 17 Documents
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Search results for , issue "Vol 17, No 2: Agustus, 2024" : 17 Documents clear
Sensitivity Analysis of Digital Elevation Model In The Use of Hydrological Applications Sahid, Sahid; Ihsan, Haikal Muhammad; Saefulloh, Muhammad Abia; Ulhaq, Wiedad Diya
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22449

Abstract

Assessing DEMs is a critical step in hydrological applications to reduce uncertainties. This study assesses the uncertainty level of using several DEM products by comparing the derivation of watershed morphometric information in the form of hydrological boundaries, river flow networks, and meeting points between river networks. This research assessed three DEM products, namely SRTM, ASTER GDEM, and NASADEM, with the topographic map as reference data for product assessment. The evaluation is based on two criteria: DEM product assessment and morphometric extraction. The second criterion assessment compared river morphometry products from several parameters, including watershed area, river network density, and river network meetings. The analysis results showed that in the first criterion, the NASADEM product was the product with the closest RMSE and PBIAS values to the reference data. Further assessment of river morphometry products shows that the ASTER GDEM watershed area parameter has the closest area value. In the horizontal accuracy parameter of river network products, NASADEM has the smallest average error value. Furthermore, in the accuracy assessment in determining the meeting between tributaries and the main river and the density of river flow, SRTM is the closest compared to other DEM products. The vertical and horizontal accuracy of DEM must be considered before using in hydrologic applications.
Rancang Bangun dan Pengujian Prototype Hybrid Solar Dryer Jamaldi, Agus; Budi Raharjo, Emanuel; Surwono, Edi; Yordan Santoso, Lewi; Catur Prasojo, Ryan
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22673

Abstract

This study aims to test the prototype solar dryer using a hybrid drying mechanism. The study utilized direct and indirect drying models. The indirect drying used solar collectors. Solar collector serves to absorb heat captured by the black body inside. The solar collector media used are flat plates and corrugated plates. The hot air from the solar collector is blown and forced by the blower into the drying chamber. Blowers operate using electrical energy generated by solar panels. The experiment lasted for two days from 09.00 a.m. to 03.00 p.m. The observations focused on the temperature of the solar collector and the drying chamber as well as the output of electricity generated by the solar panels. The test results showed the highest temperature reached by the solar collector with a corrugated plate was 50.500C, while the flat plate was 49.600C. Furthermore, the highest electrical power produced by solar panel was 11.33 Watts.
Pengaruh Massa Perekat Tapioka Terhadap Durabilitas Biobriket dari Arang Kulit Singkong Fitriyano, Gema; Sari, Fatma; Susanty, Susanty; Ar Rahim, Dicka; Nabilah, Rifa; Wulandari, Qodirani Apri
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22549

Abstract

Commercially competitive in the global market, bio-briquettes derived from coconut shell charcoal have been extensively manufactured and meet all standard prerequisites. Bio-briquettes sourced from different biomass materials, with calorific values that meet the criteria, have not entered commercial production. Currently, they remain in the research and development phase. One of the reasons is the suboptimal durability value of the bio-briquettes, causing the products to easily break during distribution and usage. This research aims to determine the optimal amount of binder in the production of bio-briquettes from cassava peels. This is because cassava peels have calorific values that meet the requirements and have a huge potential for commercial-scale production. This study utilizes cassava peel charcoal as the raw material mixed with tapioca binder in variations of 9%, 10%, 11%, 12%, and 13% of the cassava peel charcoal mass. The optimal percentage of tapioca binder mass was found at 9% with a durability value of 99.54%, density 1 g/cm3 and water content 5.39%.
Analisis Faktor Penyebab Time Overrun Proyek Pembangkit Listrik Dengan Pendekatan Partial Least Square Structural Equation Modeling Ariyanto, Agus Dwi; Armono, Haryo Dwito
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.26597

Abstract

Power plant projects are crucial to providing andining a reliable power system. Power plant projects, like other construction projects, often experience a problem of delayed completion of work known as time overrun, which can result in financial losses and project failure to be completed on time. Time overrun is overtime that exceeds the completion date specified in the contract or the project submission date agreed by both parties. Engineering, procurement, construction, and commissioning are all parts of the power plant construction project. In completing the project, it is essential to understand why the power plant construction project is delayed and how to properly mitigate the risk. This research is quantitative research, which means using a questionnaire. The aim of this study is to find out what caused the time overrun of the power plant project at the Timorese PLTU. Partial Least Square Structural Equation Modeling (PLS-SEM) is used to process data from questionnaire results. The results of the research showed that there were seven research hypotheses, with two accepted and five rejected. The external factors, and the owner-related factors are the time overrun factors based on the accepted hypothesis. Based on the cause of the time overrun, some mitigation measures can be recommended to management including a memorandum of understanding (MoU) scheme with stakeholders related to existing permits, a scheme related to contractual and technical procedures when unforeseen conditions occur and ensuring the quality of the results of the soil investigation.
Waste Analysis Of Pasted Woven Production Process Using Lean Six Sigma Method Agustina, Mega; Rochmoeljati, Rr.
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.25646

Abstract

This research was conducted in a company engaged in the production of cement bags which include pasted woven, pasted kraft, and sewn woven. Waste is still generated on the production floor throughout the pasted weaved manufacturing process. The essential waste that happens, including faults, waiting, Environmental, Health, and Safety, as well as other problems that cause the lead time to be too lengthy, namely 1430 minutes. The goal of this study is to assess the degree of waste that happens by calculating Defects Per Million Opportunities and the sigma level, as well as to make recommendations for improvement. The research results show that the reduction in lead time for waste of non-value-added defects in the pasted woven production process, which was originally worth 1430 minutes, can be reduced to 1365 minutes by reducing activities in the form of a 65-minute delay, thereby reducing cycle time in the pasted woven production process. The average DPMO value was 36898 at a sigma level of 3.284. Proposed modifications to decrease waste are analyzed using Failure Mode and Effect Analysis and Risk Priority Number values to identify the sources of waste. Recommendations for companies provide training to operators to avoid human error, inspect raw materials before entering the production process and periodically control the condition of machines.
Performance Evaluation of Dolomite Fertilizer Production: AHP and Scoring System Approach Based on Performance Prism Sholeha, Fitriatus; Pulansari, Farida
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.25701

Abstract

Fertilizer production often faces various performance issues that can affect efficiency and productivity. One of the main problems is the instability in the quality of raw materials, which can result in variations in the quality of the final product. Workforce performance is also a critical factor, where inadequate training and low motivation can reduce productivity. The lack of an appropriate performance measurement system, such as relevant and accurate Key Performance Indicators (KPIs), can make it difficult for companies to monitor and improve their overall performance. To address these challenges, a performance measurement system is needed that can integrate various aspects of the company (stakeholders). This performance measurement system must be able to accommodate the interests of various parties involved in the company's operations to produce more accurate and relevant information. The performance measurement approach referred to is known as the Performance Prism. It is then supported by using the Objective Matrix (OMAX) method to determine the ranking and class calculation of each KPI and the Traffic Light System (TLS). Based on performance measurements using the Performance Prism, Analytic Hierarchy Process (AHP), and Scoring System at PT. XYZ, there are 53 KPIs divided among various stakeholders. From this analysis, it can be concluded that the design of the company's performance measurement encompasses various aspects involving both internal and external stakeholders. The total performance index of 13.43 indicates overall good performance. In this case, the total KPIs used are 53 KPIs, which include 10 KPIs for employee stakeholders, 5 KPIs for owner stakeholders, 10 KPIs for customer stakeholders, 5 KPIs for government stakeholders, 4 KPIs for investor stakeholders, 10 KPIs for supplier stakeholders, 4 KPIs for partner stakeholders, and 5 KPIs for surrounding community stakeholders. According to the results of the Objective Matrix (OMAX) and Traffic Light System (TLS), it can be seen that 47 KPIs fall into the green category, indicating good achievement, while 3 KPIs fall into the yellow category, and 3 other KPIs fall into the red category, indicating areas requiring further attention for improvement.
Analisis Sebaran BOD dan TSS pada Sungai Kapuas di Sekitar PTPN XIII Rimba Belian Kabupaten Sanggau Larasati, Allisha; Winardi, Winardi; Purnaini, Rizki
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.24586

Abstract

The research area, namely the Kapuas River, serves as a disposal site for waste from household activities, including bathing, washing, and sanitation (MCK), as well as waste from the industrial and plantation sectors. PTPN XIII Rimba Belian, located in Rimba Belian Hamlet, Semerangkai Village, Kapuas Subdistrict, Sanggau Regency, operates in palm oil (CPO) production, resulting in the formation of waste containing organic compounds such as BOD and TSS. Waste from the PTPN factory's wastewater treatment plant (IPAL) that enters the river can render the river unsuitable for use, leading to diseases, and may cause a decrease in the river's assimilative capacity. Therefore, modeling is needed to analyze the spread of BOD and TSS and calculate the assimilative capacity for pollution using the WASP 7.5 model. The objective of this modeling is to predict the river's assimilative capacity for pollution and the impact of changes in water quality caused by oil palm plantations around the Kapuas River in the research location. The modeling is conducted by segmenting the river into 6 segments. The results of this study indicate that the PTPN XIII factory plays a significant role in contributing to BOD and TSS parameters. The assimilative capacity for BOD in the research location shows positive values in all segments except for segment 4, which has a negative value. Meanwhile, the assimilative capacity for TSS pollution load shows positive values in all segments.
Analisis Structural Equation Modeling (SEM) Pengaruh Transformational Leadership Terhadap Employee Performance Sari, Citra Arum; Nugroho, Sukmo Hadi
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.27158

Abstract

Performance results in a company can increase due to the influence of the transformational leadership style supported by how job satisfaction and behavior of its employees. Job satisfaction and OCB function to have a positive impact on employee performance, if employees are satisfied with what is given by their leaders, it will affect the progress of the company and feel encouraged to work better as well as the impact of OCB and transformational leadership on them, in terms of involving employees in voluntary work which ultimately improves performance. Contributions to this research so that in the future it can expand information and new references. This research also expands the literature by examining the mediating influence of OCB and provides new directions for researchers to study transformational leadership and OCB. The sampling method is purposive. The data collection technique begins with the distribution of an initial questionnaire (pre test) to 30 respondents, then continues with a sample of 150 respondents. The research was conducted quantitatively with the SEM (Structural Equation Model) Lisrel method. The results showed that transformational leadership has a positive effect on job satisfaction, organizational citizenship behavior and employee performance directly and job satisfaction and OCB have a positive effect indirectly.
Lean Manufacturing Analysis Using Waste Assessment Model (WAM) and Root Cause Analysis (RCA) Methods Hidayatullah, Muhammad Asyrof; Pudji Widjajati, Endang
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.25657

Abstract

The rapid development of science and technology in the industrial world, causing competition between industries to be tighter. This makes the industry to increase productivity both in terms of process and results. Waste is a big problem in the industrial world. One of them occurred in a tissue industry in East Java. Where the production of towel wipes is one of the largest produced production items. The observations made identified 32 types of waste categorized into seven waste. Waste Assessment Model (WAM) is a suitable method to identify critical waste that occurs, Value Stream Mapping for mapping, Root Cause Analysis to find the root cause of problems, and 5W1H to reinforce problems and provide suggestions for improvement. The calculation and analysis results of the Waste Assessment Model (WAM) method obtained the largest amount of critical waste, namely defects by 20.31%, by 18.59%, and Motion by 15.30%. The root cause of the problem that occurs is the condition of the engine in a state that is not optimal age and lack of maintenance, the absence of SOPs that regulate how to maintain the appropriate order, human errors in the rewinder engine setup, and the need for engine upgrades. So that some recommendations for improvements that can be made are starting from the development of SOPs, training and monitoring, upgrading various facilities, and machine automation. The results of Value Stream Mapping (VSM) showed that the Value Cycle Efficiency (PCE) after improvement increased from 45.26 to 64.38%. This shows the success of improvement recommendations in resolving various wastes and increasing the efficiency of existing processes.
Dampak Penambahan Fly Ash Batu Bara Terhadap Kinerja Balok Beton Bertulang Tunggal Sukmawati, Yulinda; Muhtar, Muhtar; Ahmad, Hilfi Harisan
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.25784

Abstract

The Paiton Steam Power (PLTU) is an industry that uses coal as fuel. One of the wastes is fly ash. Fly ash can be used as a partial replace cement because it has pozzolanic properties. The aim of this research is to determine the effect of adding coal fly ash on the flexural capacity, stiffness, ductility, crack patterns and failure of single reinforced concrete beams. The test objects consisted of five cylinders and five beams in the proportions of 0% fly ash, 5% fly ash, 10% fly ash, 15% fly ash and 20% fly ash. The fly ash used is type C category. The beam testing uses a four-point loading method. Test results showed that beams containing 15% fly ash have higher performance than other proportions. The flexural capacity of beams containing 15% fly ash increases to 18.96%, ductility increases to 2.74% and stiffness decreases to 24.44% of normal concrete or 0% fly ash. The crack and failure patterns of beams in the proportion fly ash have the same pattern as normal concrete.

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