Jurnal Online Universitas Pahlawan Tuanku Tambusai
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Analisis Efisiensi Biaya Persediaan Material Listrik dengan Metode EOQ, Safety Stock, dan Reorder Point
Full text linkThis study aims to analyze the cost efficiency of electrical component material procurement at PT Kimindo Jaya Indonesia through the implementation of the Economic Order Quantity (EOQ), Safety Stock, and Reorder Point (ROP) methods. A quantitative approach was applied using data from ten key components used in the assembly process of power distribution panels. Calculations were conducted to determine the optimal order quantity, safety stock level, and reorder point. The findings indicate that implementing the EOQ, Safety Stock, and ROP methods reduced the company’s annual inventory cost from IDR 5,740,000 to IDR 3,900,000, achieving a 32% cost efficiency. These results highlight the importance of measurable inventory policies in maintaining supply continuity and cost efficiency in project-based companies. Future research is recommended to integrate digital forecasting systems to enhance material procurement accuracy
Penerapan Metode Holt-Winters untuk Forecasting Kebutuhan Gas Alam pada Perusahaan Listrik
Full text linkAccurate natural gas demand planning is a critical factor in maintaining the operational reliability of electricity companies. Discrepancies between planned and actual gas consumption, caused by fluctuations in generation load and dispatch decisions by P2B (Load Dispatch Center), highlight the need for an appropriate forecasting method. This study aims to forecast natural gas demand using the Holt–Winters Additive method based on historical gas consumption data from November 2023 to October 2025. The research adopts a quantitative approach with time series analysis and is processed using Minitab software. Model accuracy is evaluated using the Mean Absolute Percentage Error (MAPE) indicator. The results show that the optimal parameters α = 0.2, β = 0.6, and γ = 0 produce a MAPE value of 5%, which is classified as very good. The forecasting results can serve as a basis for more efficient gas supply planning and support the reliability of power plant operations
Usulan Perbaikan Efisiensi Operasional Melalui Pendekatan Seven Waste dan Metode 5S pada Bisnis Ritel (Studi Kasus: Koperasi UB)
Full text linkThis study aims to identify operational waste based on the Seven Waste approach and to propose improvement strategies through the implementation of the 5S method in a retail business. The study employs a case study approach conducted at Koperasi UB, which operates with limited space where storage and product display areas are combined. The research methods include waste identification using the Seven Waste framework, root cause analysis through the 5 Whys method, and the formulation of improvement proposals using the 5S methodology. The results indicate that the dominant wastes are inventory waste, motion waste, and defect waste, caused by overstock conditions, ineffective layout, and the absence of standardized operational guidelines and demand forecasting. The proposed improvements focus on workspace arrangement, storage standardization, and the development of work discipline to enhance operational efficiency and minimize waste
Analisis Potensi Risiko Menggunakan Metode Hazard Identification, Risk Assessment, and Determining Control (HIRADC) pada Lapangan Penumpukan Petikemas Area LA 3 di PT. XYZ
Full text linkOperational activities in container stacking yards involve significant occupational safety risks due to interactions between workers, heavy equipment, and operational vehicles. This study aims to identify hazards, assess risk levels, and determine risk control measures using the Hazard Identification, Risk Assessment, and Determining Control (HIRADC) method in the container stacking yard of Area LA 3 PT. XYZ. The study was conducted through field observations and interviews with the HSSE department. The results identified 15 hazards with varying risk levels, consisting of moderate, high, and very high risks, with the highest risk arising from manual twistlock operations. Risk controls focus on engineering and administrative measures supported by personal protective equipment. The HIRADC method is effective in reducing risks to acceptable levels.
Hubungan Tingkat Stres Ujian Dengan Status Tekanan Darah Pada Mahasiswa Keperawatan Universitas Muhammadiyah Surakarta
Full text linkMahasiswa termasuk kedalam kelompok yang rentan mengalami stres akademik terutama saat menghadapi ujian. Stres merupakan suatu respons fisiologis maupun psikologis yang berpotensi mempengaruhi fungsi tubuh, termasuk peningkatan tekanan darah. Hal ini dapat memicu gejala seperti pusing, jantung berdebar, dan kelelahan, namun seringkali diabaikan. Studi ini bertujuan untuk menganalisis hubungan antara tingkat stres saat ujian dan kondisi tekanan darah pada mahasiswa keperawatan. Desain penelitian yang diterapkan adalah analisis korelasional dengan pendekatan cross-sectional. Jumlah peserta dalam studi ini adalah 207 mahasiswa keperawatan yang dipilih dengan metode purposive sampling. Tingkat stres dinilai melalui kuesioner standar yang disebut Perceived Stress Scale-10 (PSS-10), sedangkan tekanan darah diukur menggunakan sphygmomanometer yang diukur sebanyak dua kali yaitu pada masa pembelajaran biasa dan pada masa ujian. Analisis data dilakukan menggunakan uji non-parametrik Spearman Rank Correlation. Temuan studi mengindikasikan adanya korelasi yang penting antara tingkat stres saat ujian dan kondisi tekanan darah pada mahasiswa keperawatan (ρ = 0,000 ; r = 0,449) untuk tekanan darah sistolik dan (ρ = 0,000 ; r = 0,423) untuk tekanan darah diastolik
Penerapan Metode Seventools untuk Meningkatkan Kualitas Produksi di CV. Budidaya Jamur Sejati
Full text linkThis internship was conducted at CV. Budidaya Jamur Sejati, a company engaged in oyster mushroom cultivation. The objective of this study is to analyze and improve production quality by implementing the Seven Tools method as a quality control tool. The method includes: check sheet, Pareto chart, fishbone diagram, histogram, control chart, scatter diagram, and flowchart. Data was collected over a 12-week period through direct observation, interviews, and analysis of weekly inspection sheets. The results show that out of 88,932 total production units, there were 1,375 defective units (approximately 1.5%), with the most frequent defects being: unspread mycelium (35%), underfilled baglog (34%), and leaky plastic bags (31%). The fishbone diagram identified root causes from human factors, unstandardized work methods, substandard raw materials, and uncontrolled environmental conditions. The control chart indicates that the production process remains within control limits, although there is a trend approaching the upper limit
Penerapan Lean Manufacturing untuk Meminimasi Waste pada Produksi Udang Beku
Full text linkThe Factory faces the significant challenge of managing waste to improve productivity and reduce operational costs. This study specifically addresses waste generated during the production of frozen shrimp, a high-value Indonesian fishery commodity. This paper is aim to analyze and minimize the waste using the Lean Manufacturing. The Lean Manufacturing was executed through three key steps: Current State Value Stream Mapping (VSM), Classification of production activities, and Identification and analysis of specific wastes.The results indicate that implementing the prescribed Lean manufacturing methods can significantly address the company's waste issues, leading to both increased productivity and a substantial reduction in costly waste expenses. The implementation at PT XYZ was based on aligning theoretical Lean concepts with empirical field data, which is intended to serve as a valuable alternative learning resource for future development
Analisis Peramalan Permintaan pada Divisi Welding di PT Terang Dunia Internusa dengan Menggunakan Metode Single Moving Average
Full text linkThe bicycle manufacturing industry is a sector that continues to experience growth as public awareness of the importance of a healthy, environmentally friendly lifestyle increases, and interest in cycling grows. In the production process, the Welding Division plays a crucial role as it is responsible for assembling the main components of bicycles, namely the frame. This study focuses on demand forecasting in this division so that the company can determine production targets more accurately. The single moving average method was chosen as the forecasting technique because it is suitable for limited data conditions, both for production and sales needs. The researchers divided this method into three variations: forecasting with a 2-month, 3-month, and 4-month period. The analysis results showed that the 2-month single moving average method provided the most accurate results with a mean absolute percentage error of 28%, which is lower than the other methods. Overall, the average production in the Welding Division reached 54,050 units.
Analisis Beban Kerja dan Pengaruhnya Terhadap Kelelahan Kerja Serta Gangguan Muskuloskeletal pada CV XYZ
Full text linkThis study aims to analyze the physical and mental workload and their influence on work fatigue and musculoskeletal disorders among employees at CV XYZ, a metal fabrication company characterized by high operational intensity. Data were collected through direct observation, interviews, and questionnaires, including physical workload measurement using the Cardiovascular Load (CVL) method, mental workload assessment using the NASA-TLX method, work fatigue evaluation using a 30-item fatigue questionnaire, and musculoskeletal disorder assessment using the Nordic Body Map (NBM). The results showed that the average physical workload was categorized as moderate, with a CVL value of 53.31%. Meanwhile, the mental workload was found to be very high, with an average score of 82. The level of work fatigue after performing tasks reached an average score of 81, classified as high, indicating significant fatigue accumulation among workers. Additionally, musculoskeletal complaints yielded an average score of 34.45, categorized as moderate, with two workers experiencing high-risk symptoms. These findings indicate that employees exposed to substantial physical and mental demands that contribute to increased fatigue and musculoskeletal complaints. Therefore, ergonomic interventions, workload adjustment, and improvements in work conditions are essential to reduce fatigue levels and enhance worker well-being and productivity
Peningkatan Pengendalian Kualitas Sebagai Upaya Meminimalkan Produk Cacat pada Kayu Ekspor
Full text linkThe wood export industry requires strict quality standards, as even minor defects can reduce product value. PT XYZ still records defect levels above 10% tolerance, indicating that its quality control system needs improvement. This study aims to identify the root causes of defects and propose corrective actions to reduce their occurrence. Statistical Process Control (SPC) is used to determine dominant defect types, while Failure Mode and Effect Analysis (FMEA) prioritizes risks based on RPN values. The Plan Do Check Act (PDCA) cycle supported by 5W+1H serves as framework for systematic improvements. Results show that cracks, voids, improper thickness, and warping are mainly caused by unstable kiln conditions, worn moulder blades, inconsistent press pressure,and uneven wood moisture content. Implementation of PDCA actions effectively reduced finger laminating defects from 15,20-15,29% to 10,05-10,09% and decking defects from 14,62-16,66% to 10,03-10,06%. integration of SPC, FMEA, and PDCA provenly strengthens quality performanc