UNISTEK

Perancangan Tata Letak Fasilitas dengan Menggunakan Metode Line Balancing untuk Meningkatkan Efisiensi Produksi Home Industry Pembuatan Gitar

Adi Pras — 2025-06-25

The home guitar manufacturing industry has emerged as one of the leading sectors in the Baki District, Sukoharjo Regency. This home industry specializes in producing acoustic guitars through a buy-to-order system. One of the challenges faced by the guitar manufacturing home industry is the inefficient layout of the utilized facilities, as the production process for each guitar component takes place in different locations â€“ specifically, four distinct sites for four workstations. Therefore, there is a need for integrative decision-making related to production processes, workflow, employee positions, and the layout of production machinery. Line Balancing is a method employed to optimize the efficiency of the production facility layout. namely Workstation 1 (body molding process), Workstation 2 (body assembly and sanding process), and Workstation 3 (painting and finishing process). The reorganization of these work elements aims to achieve better efficiency and workflow balance. Furthermore, the research results demonstrate that utilizing a work cycle of 28.57 minutes yields an efficiency rate of 99.17% and an effectiveness rate of 100%. Hence, the implementation of a 28.57-minute work cycle is considered a more efficient option, with a positive impact on workflow balance.

Analisis Perbandingan Biaya Bahan Bakar Pada Boiler di PTm Ogawa Indonesia

Novita Yuliani — 2025-06-25

Industry is all forms of economic activity whose process is to change basic materials to produce products or finished goods that have added value or are beneficial to society. The purpose of this study is to identify the comparison of diesel fuel and natural gas costs in boilers at PT. Ogawa, to determine the efficiency value of natural gas fuel in boilers, and to determine the risks of using diesel fuel and natural gas. This study is a qualitative research, namely by interviewing employees in the Industry and Commercial sales division who are tasked with seeking information on prospective customers who will subscribe to gas from PGN. The results of the analysis obtained using literature studies are the average consumption of diesel fuel in boilers per month is 40,000 liters / month and estimated fuel costs of around Rp380,000,000, - / month, greater than the use of natural gas fuel of 42,350 m^3 / month and estimated fuel costs of around Rp229,108,000, - / month. So the use of natural gas fuel is superior compared to the use of diesel fuel

Perbaikan Postur Kerja pada Proses Mixing di PT. Xc Cleanindo

Ahmad Farhan Farhan — 2025-06-25

This PT XC CLEANINDO is a manufacturing startup that provides cleaning and sanitation needs. The mixing and packing process in this company has less ergonomic work postures and facilities. Based on the Nordic Body Map (NBM) questionnaire, operators often feel pain in several parts of the body due to non-ideal working postures, especially repeated bending positions during the mixing process which can trigger back injuries. Postural analysis using the REBA and QEC methods showed a high risk score (REBA: 8, QEC: 61.36%). To reduce this risk, it is recommended to modify the manual lift table according to Indonesian anthropometric data. After improvement, the REBA score dropped to 3, indicating significant improvement in working posture, especially in the operator's neck and back. This implementation is expected to increase productivity and worker health.

Perancangan Ulang Tata Letak Proses Produksi Di PT XYZ Menggunakan Metode Blocplan

Dede Roni — 2025-10-28

PT XYZ Merupakan sebuah perusahaan manufaktur komponen otomotif asal Jepang yang ada di Jababeka yang telah berdiri sejak Mei 2011. Penelitian ini bertujuan untuk perbaikan perancangan layout, serta perbandingan jarak dan biaya pengeluaran untuk material handling antara tata letak yang ada dengan tata letak yang diusulkan. Penelitian ini menggunakan metode software BLOCPLAN dan ARC untuk menyelesaikan permasalahan yang berkaitan dengan penataan fasilitas, termasuk kedekatan hubungan antar area, kebutuhan luas ruang, serta jarak perpindahan material, biaya material handling, dan hasil tata letak akhir. Dari hasil analisis yang dilakukan, diketahui bahwa biaya material handling pada tata letak yang lama mencapai Rp 89.571.268, dengan jarak perpindahan material mencapai 1.023.696 meter per bulan. Sementara itu, setelah penerapan metode BLOCPLAN pada tata letak yang diusulkan, ditemukan pengurangan biaya material handling menjadi Rp 61.068.518, dengan jarak perpindahan material sebesar 694.389,2 meter per bulan. Hal ini menunjukan bahwa penghematan biaya ongkos material handling sebesar 31,80%.

Partikel Karbon Aktif Tempurung Kelapa Sawit dan Zeolit Alam Bayah Teraktivasi Terhadap Penurunan Turbidity dan Bakteri Coliform pada Sungai Cibanten

Suhirman Suhirman — 2025-06-25

Zeolit alam Bayah Activated (ZeOavd) and Carnel shell activated carbon using pretretment with hidrogen peroxide (KATKS/H₂O₂) are porous materials for application multimedia filters in river water treatment. The purpose of this study to reduce turbidity and total coliform in the Cibanten River using ZeOavd and KATKS/H₂O₂. Sampel of Cibanten River flowing at 100 ml per minute into the KATKS/H₂O₂ filter tank and then flows into the ZeOavd material. Sampling was carried out 5 minutes after overflow for turbidity and total coliform analysis. The best results were checked until 5 to 120 minutes in range of 15 minute . The best results showed of Cibanten River water contacted with 2 kg of KATKS/H₂O₂and 2 kg of ZeOavd was able to reduce total coliform from 240 MPN/100 mL to 0 240 MPN/100 mL. In addition, it was able to reduce turbidity from 57.1 NTU to 1.60 NTU.

Keywords : Cibanten River; Zeolite; KATKS; Tubidity and Total Coliform .

Karakterisasi Hidrogel sebagai Absorben Metanil Yellow dari Kulit Pisang Kepok

Ismi Nurlatifah — 2025-08-11

Environmental pollution due to textile industry waste, especially synthetic dye waste, has become increasingly widespread and has become a serious concern in recent decades. Dyes such as Metanil Yellow are often found polluting waters, causing adverse impacts on ecosystems and human health due to their toxic and difficult-to-decompose nature. This study aims to identify the characteristics of hydrogels made from kepok banana peels in absorbing and degrading Metanil Yellow dye. The research methods used include organoleptic tests to determine the physical characteristics of the hydrogel, water absorption tests to measure the capacity of the hydrogel to absorb liquids, and dye degradation tests using a UV-Vis Spectrophotometer to determine the effectiveness of the hydrogel in absorbing Metanil Yellow dye. The results showed that the hydrogel had a smooth texture, had the highest water absorption capacity of 81.30% hydrogel with the addition of 0.6 grams of Sodium Tripolyphosphate, and the highest degradation of Metanil Yellow dye, which was 46.95% at a concentration of 10 ppm. %. Hydrogels made from kepok banana peels have the potential to be used as absorbers of Metanil Yellow dye.

Perbandingan Hasil Pemilihan Smartphone Menggunakan Metode SMART, VIKOR, dan MAUT dalam Sistem Pendukung Keputusan

Syahriani Syam — 2025-08-15

Selecting the right smartphone is a challenge for consumers due to the wide variety of product alternatives and the complexity of evaluation criteria such as price, technical specifications, and additional features. To address this issue, a systematic approach is needed through a Decision Support System (DSS) based on Multi-Attribute Decision Making (MADM) methods. This study aims to compare the results of smartphone selection using three MADM methods: SMART (Simple Multi Attribute Rating Technique), VIKOR (VIšekriterijumsko KOmpromisno Rangiranje), and MAUT (Multi Attribute Utility Theory). Smartphone alternatives were evaluated using six main criteria: price, battery capacity, camera quality, performance (RAM and processor), additional features, and 5G support. Each method was applied independently to generate a final ranking of the best smartphone. This research resulted in 1). A3 (Vivo V40 5G) with a value of 0.850 according to the SMART method, 2). A1 (Samsung Galaxy S24 Ultra) with a value of 0 according to the VIKOR method, and 3). A1 (Samsung Galaxy S24 Ultra) with a value of 0.925 according to the MAUT method. The results show variations in ranking across the three methods, indicating differences in their calculation approaches and sensitivity to weight distribution. This study provides a comprehensive analysis of the strengths and limitations of each method and highlights their relevance in supporting rational and need-based smartphone purchasing decisions. The findings can serve as a valuable reference for developers of recommendation systems and for consumers in making more informed choices.

Evaluasi Pengalaman Pengguna Aplikasi Kebutuhan Pelanggan Internet Menggunakan Metode User Experience Questionnaire (UEQ)

Andika Hairuman — 2025-08-15

The User Service Needs Application (USNA) was developed by ISP-X to support the efficiency and effectiveness of internet customer service (subscriber). The main function of this application is to support company employees in managing customer history, ticketing, installation and provisioning as well as pre-/post-sales activities quickly and accurately. However, several crucial issues were found such as frequent errors, disconnections, high latency, and a confusing interface display, which triggered customer complaints and internal work constraints. Therefore, this study aims to evaluate the user experience of the USNA application to support design and functionality improvements. The methodology used is the User Experience Questionnaire (UEQ) with six assessment aspects: Attractiveness, Clarity (Perspicuity), Efficiency (Efficiency), Dependability (Dependability), Stimulation (Stimulation), and Novelty (Novelty), accompanied by open-ended questions. A total of 135 respondents provided feedback through a Likert-based questionnaire and open-ended questions, resulting in a total of >700 qualitative statements. The results showed the highest score for the Attractiveness aspect (mean: 0.23) and the lowest for Simulation and Efficiency (0.10), indicating the need for better response time and work improvement. This research aligns with the Sustainable Development Goals (SDGs) regarding infrastructure and innovation, as well as decent work and economic growth.