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All Journal Juminten : Jurnal Manajemen Industri dan Teknologi IIJSE Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Journal Serambi Engineering (JSE) Venus: Jurnal Publikasi Rumpun Ilmu Teknik Academia Open
Moch. Tutuk Safirin
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health

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Evaluasi Pelaksanaan Proyek Kapal X Di Perusahaan Galangan Kapal Menggunakan Software Microsoft Project dan S-Curve Pangestika Oirala Kawuri; Moch. Tutuk Safirin
Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Vol. 2 No. 2 (2024): Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/globe.v2i2.329

Abstract

Working on a project requires careful planning, so that it can be carried out with optimal time and cost. However, in practice, the implementation of project work usually encounters obstacles that cause schedule delays which result in cost overruns. Therefore, to determine the accuracy of the implementation of a project, routine evaluation and analysis is carried out with the aim of knowing how the progress of a project is progressing. In this research, the Earned Value Analysis method is used to examine trends in schedule variance and cost variance in a period (time) during the project. Based on the calculations and analysis carried out, it can be concluded that there were no delays in the implementation of the Kapal X construction project at X company, the work was carried out according to the predetermined schedule, even faster than the previously planned schedule. Based on the results of the analysis of project completion projections in terms of time, the results for the projected remaining work time (ETS) were 268 days and for the projected total project completion time to completion (EAS) it was 594 days or 306 days faster than the initial plan of 900 days.
Analisis Sistem Antrian Pengujian Material Pada Laboratorium Pengujian Konstruksi Dengan Metode Queuing Theory Menggunakan Software POM QM Roesmita S. Alam; Moch. Tutuk Safirin
Venus: Jurnal Publikasi Rumpun Ilmu Teknik  Vol. 2 No. 1 (2024): Februari : Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/venus.v2i1.109

Abstract

A construction testing laboratory is a special facility used to carry out various types of testing and analysis of construction materials, structures and construction components. It is always busy with customers, so sometimes there are huge queues of customers. Thus, research was conducted to determine the effectiveness of the construction testing laboratory queuing system. The method used in this research is Queuing Theory. Queuing Theory is a theory related to mathematical studies and queues or waiting lines. Queuing theory is always related to all aspects of the customer's situation in obtaining a service. Analysis of material testing queues in construction laboratories using the M/M/S model shows increased efficiency after adding servers. Previously, the server usability rate was 50%, with a queue time of 0.5%. After adding servers, the usability rate increases to 75%, queue time decreases, and the probability of customers being served increases to 2.11%. These results are the basis for recommendations for improvements to increase efficiency and customer satisfaction .
Penerapan Lean Six Sigma untuk Meningkatkan Efisiensi Proses Inbound dan Outbound di Gudang PT XYZ Amelia, Avril Firda; Moch. Tutuk Safirin
Jurnal Serambi Engineering Vol. 10 No. 1 (2025): Januari 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

The operational efficiency of the warehouse is a crucial factor in supporting the smooth running of the supply chain, especially in the inbound and outbound processes. The objective of this research is to analyse the root cause of the problem and reduce waste in the form of waiting time, which has a significant impact on the performance of PT XYZ's warehouse. This research applies the Lean Six Sigma approach, with tools in the form of Value Stream Mapping (VSM) to map the process flow, as well as the implementation of 5S as a proposed improvement to improve process order and work efficiency. The results showed that the high waiting time was caused by a lack of staff training, limited transport equipment, a continued reliance on manual processes and an inefficient warehouse layout. Suggested solutions included sorting goods by frequency of use, organising the warehouse layout, cleaning the warehouse regularly and developing clear SOPs. Implementation of the improvement recommendations resulted in a 51.38% increase in process cycle efficiency. This research shows that the Lean Six Sigma approach is effective in improving the efficiency of the warehouse process in a sustainable way.
Analisis Korelasi Manajemen Waktu dengan Tingkat Beban Kerja Mental pada Mahasiswa Teknik Industri UPN “Veteran” Jawa Timur Siti Wahyu Nida; Moch. Tutuk Safirin; Tranggono
JUMINTEN Vol. 2 No. 6 (2021): Juminten: Jurnal Manajemen Industri dan Teknologi
Publisher : Teknik Industri - UPN "Veteran" Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/juminten.v2i6.349

Abstract

Perguruan tinggi senantiasa melakukan pembenahan berkelanjutan untuk memperbaiki kualitas mahasiswa. Pembenahan secara berkelanjutan ini mengharuskan mahasiswa beradaptasi dengan tuntutan akademik yang berubah seiring dengan perkembangan zaman. Perubahan model pembelajaran ini mempengaruhi kondisi mental mahasiswa. Ditandai dengan munculnya indikasi beban mental seperti rasa lelah, cemas bahkan stres. Dalam beberapa penelitian, terjadinya beban kerja mental diduga dipengaruhi oleh faktor kemampuan mahasiswa ketika melaksanakan manajemen waktu. Tujuan penelitian ini yakni guna mengetahui korelasi antara manajemen waktu dengan tingkat beban kerja mental pada model perkuliahan luring dan model perkuliahan daring. Penelitian ini menggunakan sampel sebanyak 76 orang mahasiswa program studi teknik industri UPN Veteran Jawa Timur angkatan 2018 serta 2019. Teknik analisis yang dipakai yakni uji korelasi. Sesuai hasil analisis korelasi Spearsman’s didapatkan koefisien korelasi sebanyak -0,365 yang menunjukan adanya korelasi lemah antara manajemen waktu pada perkuliahan luring (XL) dan tingkat beban kerja mental (Y). Sedangkan koefisien korelasi sebanyak -0,752 memperlihatkan terdapatnya korelasi yang kuat antara manajemen waktu pada perkuliahan daring (XD) dengan tingkat beban kerja mental (Y). Nilai koefisien korelasi negatif memiliki arti bahwasanya terdapat hubungan tidak searah yang signifikan antara variabel bebas dengan variabel terikat, dimana makin menurunnya kinerja manajemen waktu (X) maka tingkat beban kerja mental (Y) akan makin meningkat begitu pula sebaliknya.
Forecasting Analysis of Heavy Equipment Repair Services Using the Time Series Method at PT Putra Jawamas Azka Nurissyaban Achmad; Moch. Tutuk Safirin
Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE) Vol 8 No 2 (2025): Sharia Economics
Publisher : Universitas KH. Abdul Chalim Mojokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31538/iijse.v8i2.6300

Abstract

Forecasting is the art and science of predicting future events. Forecasting is an important thing to do research in companies, especially at PT Putra Jawamas, to provide ease in estimating resources and service needs. In companies engaged in the field of repair and fabrication, there are resource needs and service needs that must be prepared to maintain the stability and quality of services. Forecasting is a theory for estimating future events by involving the historical past retrieval. This company uses forecasting to estimate the demand for heavy equipment repair services in the future using the time series method, which is part of several methods, including single exponential smoothing, weighted moving average, and moving average. The research methods used are interviews, observations, historical data collection and literature studies related to this discussion. The results of this study indicate that the best research method of the weighted moving average and exponential smoothing methods for the demand for heavy equipment repair services at PT Putra Jawamas is exponential smoothing with α = 0.2 and the forecast for October 2023 is 4 units.
Marketing Mix 7P and Repeat Purchase Behavior in Café Business: Bauran Pemasaran 7P dan Perilaku Pembelian Berulang dalam Bisnis Kafe Audiansyah Agni Nirvana; Moch. Tutuk Safirin
Academia Open Vol. 10 No. 1 (2025): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/acopen.10.2025.11083

Abstract

General Background: The food and beverage industry faces intense competition, prompting businesses to apply strategic marketing to reach and retain consumers. Specific Background: A café business in Surabaya is used as a case to assess how marketing strategies affect customer behavior in a highly competitive market. Knowledge Gap: There is limited empirical analysis on how the individual components of the Marketing Mix 7P influence both purchasing and repurchasing decisions within local food service settings. Aims: This study aims to examine the role of the Marketing Mix 7P (Product, Price, Place, Promotion, People, Process, and Physical Evidence) in shaping purchasing and repurchasing decisions using the Structural Equation Modeling (SEM) approach with AMOS software. Results: Data collected from 120 respondents through an online questionnaire show that Product and Place significantly influence purchasing decisions. People, Process, and Physical Evidence do not show significant effects, while Price and Promotion were removed due to multicollinearity. Furthermore, purchasing decisions are found to significantly affect repurchase behavior, while none of the marketing mix variables directly influence repeat purchases. Novelty: This study presents empirical findings from a local café context using SEM to uncover which marketing factors matter most in influencing consumer behavior. Implications: Results suggest focusing marketing strategies on product quality and location to encourage initial purchase, which in turn supports repeat purchase behavior. Highlights: Product and Place significantly affect purchasing decisions. Purchasing decisions drive repeat purchase behavior. Price and Promotion excluded due to multicollinearity issues. Keywords: Marketing Mix, SEM, Consumer Decision, Repurchase, Food Service
Co-Authors Amelia, Avril Firda Audiansyah Agni Nirvana Azka Nurissyaban Achmad Pangestika Oirala Kawuri Roesmita S. Alam Siti Wahyu Nida Tranggono