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All Journal SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Tibuana : Journal of Applied Industrial Engineering Nusantara Science and Technology Proceedings International Journal of Eco-Innovation in Science and Engineering (IJEISE) Juminten : Jurnal Manajemen Industri dan Teknologi Jurnal Manajemen Jurnal Sains Student Research
Yekti Condro Winursito
Department Of Industrial Engineering, Faculty Of Engineering, Universitas Pembangunan Nasional Veteran Jawa Timur, Surabaya 60294, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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Journal : Nusantara Science and Technology Proceedings

 1 
Supplier Selection Analysis of Rubber Raw Material Using TOPSIS Method Dira Ernawati; Yekti Condro Winursito; Lutvia Agustin
Nusantara Science and Technology Proceedings 2nd International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

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Abstract

Customer satisfaction is the main orientation of a company. To fulfill consumer desires, the company should pay attention to procuring raw materials and choosing the right supplier. Manufacturing companies have to think about how their products have added value compared to other companies. Company XYZ needs to determine the right strategy for purchasing rubber raw materials to increase the efficiency and effectiveness of the company. The method for analyzing the selection of suppliers of rubber raw materials is the TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) method with the weighting of the criteria obtained from the AHP calculation value. The TOPSIS method is used to sort alternative suppliers based on the closest distance from the alternative value to the positive ideal solution and the farthest distance from the perfect negative solution. The data processing results are compared to other suppliers with a value of 0.31088 and the distance of the farthest negative ideal solution from the others with a value of 0.22064. Rank 1: company C, Rank 2: company A, Rank 3: company E, Rank 4: company B, Rank 5: company D.
Development Project Evaluation Tebangi Besar–Kayu Agung Lampung Toll Road Yekti Condro Winursito; Handoyo; Iriani; Dwi Sukma Donoriyanto; Irma Dian; Mega Cattleya Prameswari Annissaa Islami; Rizky Setiawan
Nusantara Science and Technology Proceedings 2nd International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

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Abstract

Project management is a process of activities to manage organizational resources owned by the company to achieve certain goals. The Terbangi Besar-Kayu Agung Lampung toll road construction project is a project that must be completed in a short time. This study has a purpose to evaluate the performance of the construction project of the Terbangi Besar-Kayu Agung Lampung toll road using the PERT and CPM methods with a toll road length of 189.2 km (117.6 miles). Based on the results obtained by using these two methods, the project completion time which was originally 238 days can be completed in just 119. There are several alternative proposals. The alternative proposal by adding work shifts that have crashed 32 times has an optimal cost of IDR 39,154,229,627.03 and an optimal time of 119 days. While the alternative of increasing the capacity of the equipment produces an optimal time of 189 days and an optimal cost of IDR 39,205,747,076.44 with the crashing process reaching 12 times of crashing. The Toll Road Development Project Planning is scheduled to have a normal time to work for 238 days at a total cost of IDR 39,349,097,164.38.
Production Machine Effectiveness Analysis Using Overall Equipment Effectiveness (OEE) and Root Cause Analysis Joumil Aidil Saifuddin; Isna Nugraha; Yekti Condro Winursito
Nusantara Science and Technology Proceedings 2nd International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

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Abstract

A manufacturing company in production activities requires machinery and equipment. The machine has reliability, namely the opportunity for the machine to operate according to its function in a certain period. Company XYZ is a company located in Sidoarjo and is engaged in manufacturing with the main product being White Crystal Sugar (GKP). Company XYZ has several machines or equipment that operate 24 hours throughout the milling season with a series and parallel system so that the probability of damage to machine components is quite high. One of the machines that are often damaged is the boiler engine. Based on the problems that exist in this company, it is necessary to evaluate the engine performance at the boiler station during the milling period. The methods used in this research are Overall Equipment Effectiveness (OEE) and Root Cause Analysis. The OEE value obtained by the machine at the boiler station at Company XYZ for machines that have a value above the ideal standard of 85%, namely bagasse carrier IV, bagasse carrier III, bagasse carrier II, belt conveyor, reclaimer I, and reclaimer II. Meanwhile for machines that have a value below the ideal standard of 85%, namely boilers KCC of 77.98%, boilers FCB of 81.73%, and bagasse carrier I of 82.37%. This condition shows that production is considered reasonable, but still shows that there is a large room for the company to make developments.
Profit Maximization Using Simplex Method on ABC Home Industry Yekti Condro Winursito; Munirotul Aina Bin Nur Hidayah; Widya Amelia Krisnanda; Erwan Adi Saputro
Nusantara Science and Technology Proceedings 3rd International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2022.2703

Abstract

The home industry ABC daily produces cassava, yams, and tempeh chips. From preliminary observations, information is obtained that enables determining the composition of the number of units for each type of chip produced and determining the selling price of the product per unit, which is carried out based on experience while running the business. Therefore, there is no ideal way to define it. This condition requires a review of the company's profit to determine whether it is optimal or not. This research aims to determine the number of production units of each type of chip to obtain maximum profit and the efficiency of using cost and time resources. Data collection was carried out by observation and interviews. The mathematical model of the research problem is a linear program problem with three variables that can be solved by the simplex method. From the results of the data analysis, it was concluded that to obtain maximum profit. The company had to produce 74 units of cassava chips and 161 units of cassava chips without producing tempeh chips. The maximum profit is IDR 285.387 (previously IDR 247. 000), the production capital is IDR 889.613 (previously IDR 928.000) and all available time has been consumed.
Total Productive Maintenance Analysis Using OEE and FMEA Method at PT. XYZ Phosphoric Acid Factory Joumil Aidil Saifuddin; Isna Nugraha; Yekti Condro Winursito
Nusantara Science and Technology Proceedings 3rd International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2022.2711

Abstract

The smooth production process in the company is influenced by several factors, one of which is the machine. Machine maintenance is something that needs to be done by the company because it has an important role in the smooth production process. PT XYZ is a company engaged in the manufacture of fertilizers and chemicals. Phosphoric Acid Plant, production department III A, PT XYZ, in its production process, has 193 machines that are used to process phosphate rock. Based on a survey related to problems that often occur at the Phosphoric Acid Plant, it can be seen that three machines have the highest breakdown time, namely 1st Filter (Fil-2321), 1st Vacuum Pump (C-2323), and Digester (R-2302 B). From these problems, machine maintenance analysis was carried out using Total Productive Maintenance with Overall Equipment Effectiveness and Failure Mode Effect and Analysis methods.
Analysis of the Level of Saturation and Fatigue in Offline Learning Academic Year 2022-2023 at ABC Elementary School in Surabaya Yekti Condro Winursito; Rusindiyanto; Jeremiah Batista Hutagaol; Moch. Annas Hidayatulloh
Nusantara Science and Technology Proceedings 4th International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2023.3626

Abstract

The effectiveness of the system of public education in a country is one of the most important aspects of its development. The COVID-19 initiative affected the educational system previously. The education system in Indonesia, however, is utilizing the offline or non-network learning approach now that the COVID-19 pandemic conditions, particularly in Indonesia, have abated. The teaching and learning process that takes place in schools exposes pupils to issues that develop in the educational setting and are frequently experienced by students. The frequent occurrence of saturation and exhaustion during school activities is one example. The objective of this final project is to determine the level of saturation and fatigue in offline learning among students at ABC Elementary School and to propose improvements to minimize the levels of saturation and fatigue. The methods used for research are MBI-SS (Maslach Burnout Inventory-Student Survey) for the level of saturation and SOFI (Swedish Occupational Fatigue Inventory) for the level of fatigue. The research results from 75 students show that for the level of saturation, there are 49 students (65%) in the low category, 25 students (34%) in the moderate category, and 1 student (1%) in the high category. For the level of fatigue, there are 56 students (75%) in the moderate category, 19 students (25%) in the moderate category, and 0% in the high category. To saturation and fatigue, the school can engage in ice-breaking activities, inject humor during learning sessions, and provide additional nutrition such as pudding or similar items in the morning.
Machine Maintenance in the Sabroe Line Using Reliability Centered Maintenance (RCM) and Maintenance Value Stream Mapping (MVSM) Methods Isna Nugraha; Joumil Aidil Saifuddin; Yekti Condro Winursito
Nusantara Science and Technology Proceedings 4th International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2023.3630

Abstract

XYZ is a company that operates in the frozen food industry in particular. The company is a producer of high-quality frozen food products for export, so, naturally, other stakeholders in each division of the company need to work together well. Machine maintenance is a key aspect in maintaining the performance and reliability of industrial equipment. To increase machine maintenance efficiency in this factory, a comprehensive and structured approach is needed. Therefore, this research will discuss the machine maintenance strategy implemented in the Sabroe production line. The two methods that will be the main focus of this research are Reliability Centered Maintenance (RCM) and Maintenance Value Stream Mapping (MVSM). The conclusion obtained by examining the highest Risk Priority Number (RPN) for each component in the blanching machine, it can be concluded that the gearbox component has the highest RPN, namely 216, which is the result of multiplying the Severity, Occurrence, and Detection values. During the period of breakdowns and repairs of the blanching machine, the Mean Time to Failure (MTTF) is found to be 242.2538 hours. Meanwhile, the Mean Time to Repair (MTTR) reaches 172.6 minutes or equivalent to 2.8 hours. The gearbox component requires a repair time of 2.8 hours. The inspection interval for the gearbox component is calculated for 302.01 hours, or every 12 days in a month. Efficiency analysis of maintenance using the Maintenance Value Stream Mapping approach indicates that the percentage of maintenance efficiency reaches 73.2%. Activities that add value require a longer time, around 172.6 minutes, while activities that do not add value require about 63.2 minutes.
Mathematics Model Interest and Actual Use of The ABC Digital Wallet Minto Waluo; Mega Cattleya PA Islami; Yekti Condro Winursito; M. Rachman Wayulo; Annisa Marwadelia
Nusantara Science and Technology Proceedings 4th International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2023.3631

Abstract

The emergence of the COVID-19 pandemic had an impact on all business sectors, both goods and services, one of which is the electronic money sector which is related to increasing transaction values. The increase in transactions using non-cash money has resulted in high competition between providers of similar products. Seeing this phenomenon, Dompet Digital XYZ as a digital wallet service provider who is in the second position needs tips to be able to shift Gojek to its competitor who is in the first position. The purpose of this research is to find out how the variables of perceived benefits, ease of use, and security affect the actual interest and use and determine the right strategy for the ABC digital wallet service. Data collection was carried out by distributing questionnaires to 135 respondents aged 18 years who had used the XYZ digital wallet service at least 1 time. Data processing was carried out using the Structural Equation Modeling (SEM) AMOS 26 method. Based on the results of the analysis, the results of the study where the perceived benefit variable has a positive and significant effect on interest in the use, the variable perception of ease of use cannot be proven, and the perceived security variable has a positive and significant effect on interest in the use, and the variable interest in use has a positive and significant effect on actual use. Based on the analysis results obtained, the mathematical model is obtained as follows: Y2 = 0.264 X1 + 0.388 X3.
Supply Chain System Analysis in Single Vendor and Multi Retailer to Reduce Bullwhip Effect Using Vendor Managed Inventory (VMI) Method at Company X Dira Ernawati; Yekti Condro Winursito
Nusantara Science and Technology Proceedings 4th International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2023.3638

Abstract

Company X, one of the largest dolomite fertilizer manufacturers in Indonesia, has recently encountered issues regarding discrepancies in information regarding demand and orders between the company and its eight sales offices. This problem mainly pertains to the Magnesium Fertilizer Magfertil 20+ product in 50 kg packaging. This situation has disrupted the company's supply chain and led to uncertainty in demand, commonly known as the bullwhip effect in the supply chain. The objective of this research is to achieve optimal inventory management to reduce the bullwhip effect among stakeholders in Company X's supply chain. The approach used is the Vendor Managed Inventory (VMI) method. The calculation results demonstrate that the implementation of the Vendor Managed Inventory (VMI) method has been highly successful in reducing the bullwhip effect at various levels within the supply chain. For instance, at the manufacturing level, the initial bullwhip effect value was 1.4503, but after implementing the VMI method, it significantly decreased to 0.4943. Meanwhile, the bullwhip effect I value at each sales office in Office Sales 1, Office Sales 2, Office Sales 3, Office Sales 4, Office Sales 5, Office Sales 6, Office Sales 7, Office Sales 8 is 1.4198, 1.4455, 1.6277, 1.4902, 1.3204, 1, 2093, 1.2994 and 1.4744. However, when applying the proposed VMI method the results of the bullwhip effect decreased drastically until the figures were 0.5007, 0.4773, 0.4909, 0.5097, 0.4975, 0.5015, 0.5014 and 0.4902.
Co-Authors Alfian Fakhri Annisa Marwadelia Dira Ernawati Dira Ernawati Dwi Sukma Donoriyanto Erwan Adi Saputro Friska Aryanti Gilang Ramadhan Hafid Syaifullah Handoyo Handoyo Iriani Iriani Irma Dian Isna Nugraha Jeremiah Batista Hutagaol Joumil Aidil Saifuddin Joumil Aidil Saifuddin Lutvia Agustin M. Rachman Wayulo Mega Cattleya PA Islami Mega Cattleya PA Islami Mega Cattleya Prameswari Anissa Islami Mega Cattleya Prameswari Annissaa Islami Minto Waluo Moch. Annas Hidayatulloh Munirotul Aina Bin Nur Hidayah Mutiara Mei Susanti Nur Rahmawati Rayhan Fatur Maulana Rizky Setiawan Rizqi Novita Sari Rizqi Novita Sari Rizqi Novita Sari Rizqi Novita Sari Rusindiyanto Sinta Dewi Sinta Dewi Widya Amelia Krisnanda Wira Yudha Nuswantoro