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All Journal Journal La Multiapp Serambi Engineering
Ahyaliya, Marsya Laila
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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Analisis Peramalan Kebutuhan dan Safety Stock Material Plat Dalam Pembuatan Kapal Pada PT. XYZ Menggunakan Metode Time Series Ahyaliya, Marsya Laila; Tranggono
Jurnal Serambi Engineering Vol. 10 No. 1 (2025): Januari 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

A shipyard is an industry that designs, builds and repairs ships. The shipbuilding process at a shipyard involves a number of complex stages, from design to launch. If there is too much stock, the company will incur high storage costs. Conversely, if the stock is too low, the production process will be hampered by delays in material delivery, which can ultimately affect the ship's launch schedule. To overcome these problems, PT XYZ needs to implement a better inventory control system. This system aims to ensure the availability of sufficient plate materials to meet production requirements, including forecasting demand, determining safety stock levels and setting reorder points. The method used in this study is a time series consisting of three methods, namely single moving average, weighted moving average and single exponential smoothing using POM-QM software. Based on the results of the study, the feasible method to be applied to PT XYZ forecasting is a moving average with a MAD value of 5,444, MSE of 46,679, MAPE of 6,695% and forecasting results of 85 pcs per month. Based on the calculation results, it is recommended to reorder the sheet material when the stock reaches the reorder point of 271 pcs. This figure takes into account the safety stock of 18 pcs.
Analysis of Waste in Electronic ID Card Services with Lean Service and Root Cause Analysis Methods Ahyaliya, Marsya Laila; Rochmoeljati, Rr.
Journal La Multiapp Vol. 6 No. 6 (2025): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v6i6.2446

Abstract

Optimal service is essential to ensure citizen satisfaction in managing population administration. This study analyzes waste in the Electronic ID Card (KTP Elektronik) service process using the Lean Service and Root Cause Analysis (RCA) methods. The research was conducted at Office X through direct observation, interviews, and the distribution of questionnaires to eight respondents directly involved in the service process. The collected data included service process flows, activity durations, waste identification, and their root causes. Using the Value Stream Mapping (VSM) method and VALSAT tools, it was found that the total lead time was 1,953 seconds, but only 238 seconds (13%) were categorized as value-added activities. The dominant types of waste identified included waiting, duplication, defects, and unnecessary movement. Based on the score calculation results, Process Activity Mapping (PAM) was selected as the main VALSAT tool. RCA analysis using fishbone diagrams and the 5 Whys method revealed root causes such as inaccurate queue time estimates, repeated data entry, lack of supporting facilities, and inefficient workplace layout. The improvement recommendations include optimizing the online queuing system and adding supporting equipment such as tripods and printers. After improvements were implemented, the service time was reduced to 898 seconds, and the proportion of value-added activities increased to 27%, indicating that the application of Lean Service and RCA was effective in improving service efficiency.
Co-Authors Rr. Rochmoeljati Tranggono