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All Journal J@TI (TEKNIK INDUSTRI) Ekonomi Bisnis JISI UMJ (Jurnal Integrasi Sistem Industri UMJ) Jurnal Sistem dan Manajemen Industri JRSI (Jurnal Rekayasa Sistem dan Industri) At-Tadbir : jurnal ilmiah manajemen Jurnal INTECH Teknik Industri Universitas Serang Raya IJIES (International Journal of Innovation in Enterprise System) Jurnal Pendidikan dan Konseling JURNAL Al-AZHAR INDONESIA SERI SAINS DAN TEKNOLOGI Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Teknik Industri Terintegrasi (JUTIN) International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Charity : Jurnal Pengabdian Masyarakat Prosiding Seminar Nasional Program Pengabdian Masyarakat i-Latinnotary Journal: Internasional Journal of Latin Notary eProceedings of Engineering
Wawan Tripiawan
Universitas Telkom, Bandung
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering 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 Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Transportation Other

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Forecasting Methods Proposal and Implementation of Distribution Requirement Planning Method to Overcome Unfulfilled Stock Availability at PT. XYZ Natalia, Christine; Gunawan, Sebastian; Liang, Yun Chia; Sugioko, Andre; Tripiawan, Wawan; Fredikson, Marcelinus
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi Volume 7 Number 1 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i1.7314

Abstract

PT. XYZ is a manufacturing company engaged in the automotive sector by producing various automotive components. Based on the results of observations and interviews at PT. XYZ, it is known that there is a shortage of stock, so that customer or consumer requests are not fulfilled at each existing distribution center (DC). Based on the problems that occur, the research result suggestions for the best forecasting method based on the time series plot of each DC request processing using the Distribution Requirement Planning (DRP) method. In addition, with the DRP method, there is additional stock. The company still has remaining stock so it can still meet customer demand for each DC, and the product distribution process runs more regularly if any defective product should be replaced. Based on research results, the DRP method is able to minimize the risk of unfulfilled demand due to product defects.
Inventory Planning and Control in Perishable Items Products Using the Single Order Quantities Method (Case Study: PT XYZ) Tanuwijaya, Amelia Tasya; Nurhasanah, Nunung; Tripiawan, Wawan
JURNAL Al-AZHAR INDONESIA SERI SAINS DAN TEKNOLOGI Vol 10, No 2 (2025): Mei 2025
Publisher : Universitas Al Azhar Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36722/sst.v10i2.4102

Abstract

Effective inventory management is crucial for companies distributing perishable products. PT XYZ requires a precise control method to optimize inventory and minimize losses. This study aims to determine the top 5 priority products, identify the best forecasting method with the smallest error and analyze the implementation of Single Order Quantities (SOQ) in inventory management. Using primary and secondary data collected from 1 January 2021 to 4 April 2022, the study employed ABC Analysis to categorize products, followed by demand forecasting using Single Moving Average, Single Exponential Smoothing, and Fuzzy Time Series to select the most accurate method. Inventory planning was then carried out using SOQ to enhance efficiency. Among 196 vegetable types, 5 were identified as the highest priority: Birdseye Chili Pepper (1 kg), Red Cayenne Pepper (1 kg), Birdseye Chili Pepper (Min. 5 kg), Local Cucumber (1 kg), and Bulk Green Paprika. The SOQ method enabled optimized inventory strategies, ensuring product availability while minimizing excess stock. This research provides practical insights for effective inventory planning, particularly for businesses handling perishable goods.Keywords - Demand Planning, Fuzzy Time Series, Inventory Planning, Perishable Product, Single Order Quantity.
Design of Economic Order Quantity on Polyester Yarn Raw Material Based on Artificial Neural Network Forecasting Fathurrohman, Muhammad Salman; Nurhasanah, Nunung; Tripiawan, Wawan
JURNAL Al-AZHAR INDONESIA SERI SAINS DAN TEKNOLOGI Vol 10, No 2 (2025): Mei 2025
Publisher : Universitas Al Azhar Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36722/sst.v10i2.4105

Abstract

Polyester yarn is a key raw material in textile manufacturing due to its durability and affordability. PT ABC relies on external suppliers for polyester yarn, making inventory management crucial for production efficiency. However, the company's current ordering approach has led to occasional stock shortages, impacting operations. This study develops an inventory control model using the Economic Order Quantity (EOQ) method, incorporating safety stock and reorder point calculations to minimize stockouts and reduce inventory costs. Additionally, Artificial Neural Networks (ANN) are used to forecast demand for 2022, improving estimation accuracy. Based on historical demand data from 2019 to 2021, the EOQ method lowers inventory costs compared to the company’s approach, achieving efficiency gains of 19%, 12%, and 29%, saving IDR45,745,000, IDR23,735,000, and IDR98,020,000, for each respective year. The ANN model utilizing the TrainLM training function achieves the lowest Mean Squared Error (MSE) of 0.063528 and forecasts a total raw material requirement of 2,510,628 kg for 2022. The EOQ value for 2022 is set at 44,817 kg, with safety stock and reorder point levels of 8,438 kg and 29,360 kg, respectively.Keywords – Artificial Neural Network, Economic Order Quantity, Inventory, Reorder Point, Safety Stock.
Mapping A Knowledge Map For Researching The Legal Framework Related To Maritime Transportation Supply Chain E-Contract Tripiawan, Wawan; Rachmawati, Irma
International Journal of Latin Notary Vol. 5 No. 2 (2025): Internasional Journal of Latin Notary, March 2025
Publisher : Magister Kenotariatan Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61968/journal.v5i2.122

Abstract

This study analyzed a reflection on a bibliometric approach to evaluate the importance and impact of the manuscripts that have been published with the title “Law of Maritime Transportation” during the period 1998-2024. It also reveals that the area of Law of maritime documents has received increased attention and interest from academicians, researchers, and research funding institutions. The paper aims to provide a wide range of maritime fields and to offer a representation of various areas and interdisciplinarity research. Furthermore, to find out how they are connected. Bibliometric analyses were used in this study to examine dominant subfields of maritime Law, mapping and clustering the keyword. The tool provided the authors' data, year of publication, country of origin, Journal of publication, and affiliated institutions. The findings show that the manuscripts regarding the legal framework of maritime transportation documents are divided into 6 clusters. The most prominent focus is the Law of the Sea, International Law, and Law of Legislation. The legal framework was an umbrella that covered shipping, maritime transportation, documentary framework, maritime policy, and sustainable development.
Design Business and Website on the Establishment of Tour Guide and Tour & Travel Platform Yenny, Yenny; Chumaidiyah, Endang; Tripiawan, Wawan
International Journal of Mechanical Engineering Technologies and Applications Vol. 2 No. 1 (2021)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2021.002.01.2

Abstract

Indonesia is a country with 16,056 islands, well known for its natural wonders and cultural heritages. Indonesia’s Travel and Tourism Competitive Index is 4.3. There is a good opportunity in establishing a business involving tour guide and tour package providers. In this paper, feasibility analysis is done based on market, technical, and financial aspect. The market aspect result shows total demand projection, which is 9,881 and 269 for tour guide booking transaction and tour package provider membership respectively during the first year of establishment. The technical aspect result shows the business process design, website design, and the operational need of the business. The total time needed for overall business process is 689.83 hours in the first year. And to operate the business the numbers of employees needed are one each for managing director, marketing, website admin, tour package provider manager, and tour guide manager. Two employees are also needed for each financial department and call centre position. The financial aspect result shows that the NPV of this business is IDR 162,798,046. The payback period is 4.339 years, and the IRR is 24.47%. The salary increase, demand decrease, and price decrease sensitivity are 6.96%, 2.86%, and 0.94% respectively.
Validating Scope Design in Project STTF Case Study PT.XYZ Agustian Mauludin; Wawan Tripiawan; Achmad Fuad Bay
International Journal of Innovation in Enterprise System Vol. 4 No. 2 (2020): International Journal of Innovation in Enterprise System
Publisher : School of Industrial and System Engineering, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25124/ijies.v4i02.88

Abstract

PT.XYZ is a company in the Telecommunication Industry. Due to increase theproduct sales, PT.XYZ performed an annual project to build network infrastructureto the uncovered network areas, called the STTF project. As a project owner,conducting a high performance of scope validation is very crucial to make sure thequality of the result meets requirements. However, the previous project result hasshown to the unsatisfactory result, i.e. titled pole resulting in high cable attenuationand over budget. To see the extent of the performance and effectiveness of thevalidation process, an evaluation of the current validate scope process is necessary.One of the methods is by comparing the operational implementation in the currentSTTF project against the project management standard to ensure the processperformed effectively. Data collected using a questionnaire based on PMBOK 6thed. standard processes using a self-assessment survey, and two project locations arechosen as a comparative sample. The verified questionnaires then distributedpurposively to validate the scope team. In the end, the result of the research showsthe implementation of validate scope activity is not comply with the standard processin PT.XYZ and there are gaps against standard practices in PMBOK.
Schedule Acceleration Planning in Construction Project (Case Study: Japek II Selatan Tollroad) Aziz Irsyad; Ika Arum Puspita; Wawan Tripiawan
International Journal of Innovation in Enterprise System Vol. 6 No. 1 (2022): International Journal of Innovation in Enterprise System
Publisher : School of Industrial and System Engineering, Telkom University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25124/ijies.v6i01.145

Abstract

This study focuses on the remaining work at stations (STA) 53+950 to 54+550 in Jakarta – CikampekII Selatan Toll Road Package III project to find the critical path, completion durations, and projectcosts before and after acceleration. The CPM Technique was used to compile network planningdiagrams, determine the critical path and project duration. Crashing Project was applied to crashschedule through the total project duration and cost whose changes due to the implementation of thecrashing method. The critical path was found in mobilization, tree felling, clearing, dig and haul,borrow material, subgrade preparation, base course (A grade), subbase course (B grade), drainagelayer, lean concrete (t=10 cm), concrete pavement, concrete barrier type B, and signage. In the CPM,the duration of project completion is 214 days. The total project budget under normal circumstancesis Rp22.073.412.654. After accelerating with the Crashing Project by proposed overtime was obtainedthe reduced total cost of Rp32.004.882 from the total normal cost of Rp22.073.412.654 toRp22.041.407.771 with an optimum duration of 183 days
Perancangan Risk Register dan Risk Response pada Proyek Feeder Resiliency Menggunakan Metode Kualitatif di PT. XYZ Fadhilah, Syailsa; Tripiawan, Wawan; Yasa, Putu
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 6 No. 4 (2023): Oktober
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v6i4.21019

Abstract

The feeder resilience project is a network development project in the form of feeders that can be restored effectively and efficiently by PT XYZ. The project has risks that can have an impact on several factors, namely productivity, performance, quality and changes in costs on the project. With this, there is a need for further risk analysis and design (risk register) to find out what risks will occur and know how to respond to risks (risk response) using a probability & impact matrix to determine the priority of risks that will occur. The method used is a qualitative method because it can create subjective design results based on real phenomena according to events in the field on projects by performing qualitative risk analysis. The risk identification that has been obtained will be assessed based on the probability of the risk occurring and the resulting impact including time, cost, quality, safety & security, and scope by relevant stakeholders and continued with determining the risk response that will be carried out. It was found that there were 175 risks that had been identified in the risk register with two types of risks, namely positive risks/opportunities and negative risks/threats and risk responses were determined to handle the risks.
Perancangan Jadwal Ulang Proyek Additional Bag Filter Bin#3 Menggunakan Metode Critical Path Method (CPM) Pada PT XYZ Widyaningrum, Firda Amalia; Tripiawan, Wawan; Yasa, Putu
eProceedings of Engineering Vol. 10 No. 2 (2023): April 2023
Publisher : eProceedings of Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstrak—Bag Filter adalah tempat penyaringan residu udara yang terdapat pada bin fine coal yang akan dilepaskan ke lingkungan. Proyek additional bag filter bin#3 diadakan untuk memperbaiki kapasitas hisapan bag filter. Proyek yang telah berjalan mengalami keterlambatan pada tahap fabrikasi yang dapat menyebabkan kerugian perusahaan sehingga perlu dilakukan perancangan jadwal ulang. Dalam perancangan jadwal ulang proyek dilakukan dengan menggunakan metode Earn Value Analysis (EVA) dan Critical Path Method (CPM). Analisis EVA yang telah dilakukan menghasilkan bahwa proyek mengalami keterlambatan mulai dari hari ke-20 berdasarkan analisis varian dan hari ke-39 berdasarkan analisis SPI dan CPI. Perhitungan estimasi waktu keterlambatan proyek, proyek akan selesai dalam waktu 143 hari dengan durasi normal 134 hari, sehingga terjadi keterlambatan selama 9 hari dengan biaya yang dikeluarkan dengan asumsi CPI adalah Rp 209.570.593,26. Analisa lintasan kritis yang dilakukan dengan metode CPM menghasilkan lima aktivitas kritis pada tahap fabrikasi yang dapat dilakukan perubahan jadwal. Perubahan jadwal disesuaikan dengan status material siap pakai dan sumbe rdaya manusia yang akan bekerja. Pada jadwal eksisting, tahap fabrikasi akan selesai pada tanggal 18 Februari 2021 dan terjadi keterlabatan selama 9 hari. Setelah dilakukan prancangan jadwal ulang, tahap fabrikasi akan selesai pada tanggal 04 Februari 2022.Kata kunci— bag filter, critical path method, earn value analysis.
Perancangan Quality Metrics Untuk Pengendalian Kualitas Proyek Dengan Metode Internal Control Pada Proyek Refurbished NTE Di Pt XYZ Firdaus, Muhammad Ilham; Tripiawan, Wawan; Bay, Achmad Fuad
eProceedings of Engineering Vol. 10 No. 2 (2023): April 2023
Publisher : eProceedings of Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstrak — PT XYZ merupakan salah satu perusahaan yang menjadi pemimpin dala industri telekomunikasi sebagai perusahaan yang memproduksi berbagai alat penunjang telekomunikasi dengan perakitan telepon dan peralatan transmisi sebagai kegiatan utamanya. Pada tahun 2019, PT XYZ mengalami kesulitan dalam perkembangan industri dan memutuskan untuk bekerja sama denga PT ABC untuk menjalankan proyek refurbished. Proyek ini memiliki garis besar yaitu perbaikan NTE (Network Terminal Equipment). Manajer proyek yang bertanggung jawab merupakan karyawan yang bekerja di PT XYZ dan terjun langsung dalam proyek ini. Kualitas yang diinginkan dari hasil perbaikan yang diinginkan yaitu NTE dengan kualitas sangat baik. Namun saat hasil proyek di deliver kepada PT ABC, ternyata terdapat komplain dari konsumen mengenai NTE yang memiliki casing perangkat mudah pecah, aksesoris mudah rusak, dan jangkauan sinyal yang pendek. Setelah dilakukan observasi dan studi literatur, didapatkan bahwa perusahaan belum memiliki quality metric sebagai dokumen pendukung untuk kegiatan control quality sehingga akan dilakukan perancangan quality metrics menggunakan metode internal control dalam mengidentifikasi kemungkinan kendala yang terjadi dan bagaimana cara mencegahnya. Serta terdapat critical success criteria sebagai parameter kesuksesan dari setiap kegiatan dengan mengadaptasi metode SMART. Hasil dari penilitian ini berupa quality metrics sebagai dokumen pendukung kegiatan control quality agar dapat menunjang proses validate scope.Kata kunci — quality metrics, internal control, smart, skala guttman, skala likert, project quality Management.
Co-Authors Achmad Fanani Adam Achmad Fuad Bay Adhi Tio Rachman Agung Pramasatya Agus Achmad Suhendra Agustian Mauludin Agustian Mauludin Ahmad, Aditias Fauzi Alan ramadhan Alan Tri Wijaya Aldhi Juliyatna Aldo Theofilus Suherman Alfathsyah, Arrasyid Alvaro Rayhan Risyad Andi Zehan Saskia Salsabila Anindhita Putri Aulia Ariani, Fathiya Safira Arrazzaq Bardo Batavio Avon Budiono Ayu Amanda Hapsari Aziz Irsyad Aziz Irsyad Bay, Achmad Fuad Bobby Hera Sagita Boby Hera Sagita Budi Praptono Budi Santosa Budiarto, Sulistyo Christine Natalia Citra Triana Budiastuti Denzakky Sumardi Devi Pratami Dian Kusuma Damayanti Endang Chumaidiyah Fadhilah, Syailsa Fathurrohman, Muhammad Salman Fauziyyah Eka Sya'bani Firdaus, Muhammad Ilham Fran Andres Fredikson, Marcelinus G. N. Sandhy Widyasthana Gamma Habie Azzaky Ghifari Naufal Rahman Grandhia Agil Patria Gunawan, Sebastian Hafiz Azis Hagie Pradivio Handoko, Kevin Revialdy Haris Mahfud Harry Nurmi Suari Husni Amani I Gusti Komang Gede Raditya Paramarta Ika Arum Puspita Imam Haryono Iman Nur Hidayat Iphov Kumala Sriwana Isnaeni Yuli Arini Kandida Kenya Utami Larasati Martaningtyas Utami Liang, Yun Chia Linati Khairina Syarofah M Teguh Kurniawan Maruf, Irma Rachmawati Miftah Dwi Rachma Miranda, Suci Mochamad Azhar Hidayat Mochammad Gerry Pamungkas Muchammad Nurul Fu’ad Muhammad Almaududi Pulungan Muhammad Fahmi Siregar Muhammad Noor Fazri Muhammad Rayes Muhammad Zamzam Nida F Maulanisa Novia Miftaqul Jannah Nunung Nurhasanah Pamungkas, Okta Bayu Panji Agda Puspita Marsya Tamara Putu Yasa Qisthi Mahran Harahap R. Yunendah Nur Fu’adah Radhita Ananda Putri Rahmiati Aulia Rajesri Govindaraju Rd. Rohmat Saedudin Reanatami Irawan Ricky Darmawan Rio Aurachman Rizki Wicaksono Parasto Rosad Ma'ali El Hadi Rosad Ma’ali E Rosad Ma’ali El Hadi Ryan Eko Purnomo Sari Wulandari Shafira, Dhea Nur Sinta Aryani Siti Hajar Komariah Sri Martini Sugioko, Andre Tanuwijaya, Amelia Tasya Trigo Septia Widyaningrum, Firda Amalia Widyasthana, G.N Sandhy Yati Rohayati YENNY YENNY Yoga Pratama Darmawan Yoga Yuniadi Zakaria, Siti Wardah