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All Journal Journal Industrial Servicess JITTER (Jurnal Ilmiah Teknologi Informasi Terapan) Jurnal Sistem Cerdas IJIES (International Journal of Innovation in Enterprise System) Charity : Jurnal Pengabdian Masyarakat Jurnal Ilmiah Wahana Pendidikan eProceedings of Engineering
Ayudita Oktafiani
Universitas Telkom
Religion Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences Transportation Other

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Scheduling Splitable Jobs on Identical Parallel Machines to Minimize Makespan using Mixed Integer Linear Ayudita Oktafiani
International Journal of Innovation in Enterprise System Vol. 7 No. 1 (2023): 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.v7i01.190

Abstract

The scheduling of parallel machines with and without a job-splitting property, deterministic demand,and sequence-independent setup time with the goal of minimizing makespan is examined in this work.For simultaneous processing by multiple machines, single-stage splitable jobs are broken into random(job) sections. When a job starts to be processed on a machine, an operator has to setup the machinefor an hour. By creating two Mixed Integer Linear Programming models, this work proposes amathematical programming strategy (MILP). A MILP model takes the job-splitting property intoaccount. Another model, however, does not include the job-splitting property. This study investigatesthe performance of the proposed models using Gurobi solver. These programs' numerical calculationsare based on actual problems in the Indonesian city of Bandung's plastics industry. On four identicalparallel injection molding machines, 318 jobs must be finished in 22 periods. The real schedulingmethod is contrasted with these two MILP models. The maximum workload imbalance, the maximumrelative percentage of imbalance, and the makespan of these three scheduling systems are used toevaluate their effectiveness. Without the job-splitting property, MILP can handle the real issue ofscheduling identical parallel machines on injection molding machines to reduce makespan, resultingin a 36% average decrease. The MILP model's job-splitting property can reduce makespan by anadditional 2.40%. The order of relative ranking is MILP with job-splitting property, MILP withoutjob-splitting property, and actual scheduling based on the makespan minimization, workloadimbalance, and relative percentage of imbalance.
Usulan Tempat Penyimpanan Tools untuk Mengurangi Aktivitas Motion di PT. XYZ Pahlevi, Sinta; Suryadhini, Pratya Poeri; Oktafiani, Ayudita
Jurnal Ilmiah Wahana Pendidikan Vol 10 No 3 (2024): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.10646086

Abstract

PT. XYZ is a manufacturing company engaged in the health industry, one of which is dental aerosol products. Based on the results of research directly in the production area, there are several problems that occur, namely finding the tools needed to carry out the production process, because the placement of tools is arbitrary, resulting in excessive movement of operators which causes non-value-added activities during the production process, and must be identified so that reduce non-value added activities. In the identification results using VSM and PAM, there are 67% non-value-added activities caused by searching activities in the production process. To reduce search activity in the production area, a tool storage area is proposed so that operators can pick up and carry tools in a special place. The simulation results using the FlexSim application after the suggestion that the search activity time can be reduced by 1467.14 seconds so as to reduce non-value added operator activities such as searching activities by 73%.
Usulan Perancangan Alat Pengering Inframerah Untuk Meminimalisir Waste Waiting Pada Proses Produksi Dental Aerosol Dengan Menggunakan Pendekatan Pengembangan Produk Naila, Helena Dinda Putri; Suryandhini, Pratya Poeri; Oktafiani, Ayudita
Jurnal Ilmiah Wahana Pendidikan Vol 10 No 3 (2024): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.10638062

Abstract

According to the Ministry of Health, after the COVID-19 situation there are still health sector challenges, namely the Triple Burden of Diases, so it is necessary to support the availability of quality medical devices to prevent these challenges from occurring. One of the companies that produce medical devices is PT. XYZ which produces dental aerosol as one of its products. Dental aerosol can play a role in facing the triple burden of diseases in preventing infectious diseases and preventing the emergence of new diseases, so that in the production process it is necessary to make efforts to prevent waste. Based on PAM data, the largest percentage is owned by NVA activities or activities that do not add value at 64%. So it is necessary to reduce waste waiting in the dental aerosol production process using the just in time approach. The results of this study can fulfill the goal of minimizing waste waiting during the assembly process that occurs in the drying process. The proposal to reduce waste waiting is to design a dryer using infrared light with the concept selection method. Based on the proposed design, there is a reduction in waste waiting time in the dental aerosol production process by 85%.
Optimasi Nilai Surface Roughness dan Material Removal Rate Pemesinan Milling Hauw Gan ZX 7550Z Menggunakan Metode Taguchi dan Grey Relational Analysis Miftah, Nadila Attin; Atmaja, Denny Sukma Eka; Oktafiani, Ayudita
eProceedings of Engineering Vol. 10 No. 3 (2023): Juni 2023
Publisher : eProceedings of Engineering

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Abstract

Abstrak-Pada proses milling, produk yang dihasilkan harus memiliki kualitas tinggi dalam waktu yang singkat. Kualitas berhubungan dengan surface roughness sedangkan produktivitas berhubungan dengan material removal rate. Keduanya saling ketergantungan dan korelasi yang kompleks sehingga sulit untuk dipahami karena banyak faktor yang mempengaruhi seperti parameter pemesinan. Sebagian besar parameter pemotongan dipilih berdasarkan pengalaman atau mengacu pada handbook sehingga tidak menjamin bahwa yang dipilih adalah parameter yang optimum. Apabila yang dipilih salah atau tidak optimal maka menyebabkan kerugian ekonomi. Penelitian ini bertujuan untuk optimasi multi-respon pada proses pemesinan milling material alumunium alloy 6061 T6 menggunakan metode Taguchi dan grey relational analysis. Eksperimen dilakukan dengan menggunakan tiga parameter input yaitu spindle speed, feed rate, dan depth of cut berdasarkan L9 orthogonal array yang dirancang menggunakan metode Taguchi. Nilai surface roughness (Ra = 0,395 µm) dan material removal rate (MRR = 105 mm3/min) optimum dicapai pada kombinasi parameter  spindle speed 1400 rpm, feed rate 15 mm/min, dan depth of cut 0,7 mm.Kata kunci- surface roughness, material removal rate, Taguchi, grey relational analysis
Scheduling N Jobs on Identical Parallel Machines in PT XYZ to Reduce Total Tardiness Using Earliest Due Date Rules and Job Splitting Property Giovanny, Tengku Khalida Zia; Damayanti, Dida Diah; Oktafiani, Ayudita
eProceedings of Engineering Vol. 10 No. 3 (2023): Juni 2023
Publisher : eProceedings of Engineering

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

Abstract

Abstract-This research focus on reducing total tardiness on single-stage identical parallel machine in PT XYZ. The method used are EDD rules where the job is sorted based on earliest due date and job splitting property where the job is split between the machine with maximum tardiness and the machine with minimum tardiness. The proposed method managed to yield successful result by decreasing the total tardiness up to 33%. Keywords- identical parallel machine scheduling, EDD, job splitting property
Perancangan Usulan Tata Letak Fasilitas Produksi PT Gerlink Mandiri untuk Mengurangi Jarak Perpindahan Material pada Produk Endoscopy dengan Menggunakan Algoritma BLOCPLAN Alip, Muhammad Yusuf; Suryadhini, Pratya Poeri; Oktafiani , Ayudita
eProceedings of Engineering Vol. 11 No. 3 (2024): Juni 2024
Publisher : eProceedings of Engineering

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

Abstract

PT. Gerlink Utama Mandiri merupakanperusahaan yang fokus utama yaitu pada pembuatan produkalat kesehatan. Dalam beberapa bulan terakhir PT GerlinkUtama Mandiri mulai memproduksi produk baru yangmengakibatkan perusahaan harus menambah gedung produksibaru karena area produksi sebelumnya tidak dapatmenampung fasilitas tambahan serta memunculkanpermasalahan utama yaitu total jarak perpindahan materialproduk endoscopy yang semakin bertambah karena mesinmesin belum sesuai dengan kedekatan fasilitas. Tugas akhir iniberfokus pada tahapan proses mekanik dalam pembuatanendoscopy. Tujuan analisis ini adalah menghasilkan rancangantata letak fasilitas usulan baru yang efektif dan efisien agardapat meminimalkan total perpindahan material sehinggamendapatkan tata letak fasilitas yang optimal. Dalam penelitianini, metode yang digunakan untuk perancangan tata letakfasilitas adalah Algoritma BLOCPLAN.Dalam Proses perancangan usulan yang dibuat dilakukanyaanalisis lebih lanjut terhadap rancangan yang diusulkan olehAlgoritma BLOCPLAN perlu adanya penyesuaian terhadapkondisi aktual lapangan. Menambahkan beberapa penyesuaiandari hasil rancangan Algoritma BLOCPLAN sehingga mampumeminimalkan total jarak perpindahan material dengan jaraktempuh yang lebih kecil pada produk Endoscopy. Darirancangan tersebut usulan Algoritma dapat mengurangi jarakperpindahan produk Endoscopy dan dapat memperoleh tingkatefektivitas dan efisensi sebesar 595 meter dan 40%. karenamayoritas mesin sudah didekatkan sesuai dengan tingkatkedekatan fasilitas dan menjauhkan mesin yang tidak terpakaiyang dapat menghambat pergerakan operator saat berkerja. Kata Kunci: Tata Letak Fasilitas, Perpindahan Material,Produk Baru, BLOCPLAN
Usulan Perancangan Tata Letak Fasilitas Di Bengkel Produksi PT. Gerlink Utama Mandiri Guna Meminimalisir Jarak Perpindahan Material Pada Produk Dental Aerosol Menggunakan Algoritma CORELAP Fahriandoni, Syafiq Kemal; Suryadhini, Pratya Poeri; Oktafiani, Ayudita
eProceedings of Engineering Vol. 11 No. 3 (2024): Juni 2024
Publisher : eProceedings of Engineering

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

Abstract

PT. Gerlink Utama Mandiri merupakanperusahaan yang berfokus pada produksi alat kesehatan yangbernama dental aerosol. Dalam dua bulan terakhir, PT. GerlinkUtama Mandiri mulai membuat produk baru yangmengakibatkan perusahaan harus menambah gedung produksibaru akibat bengkel produksi yang tidak mampu menampungfasilitas tambahan serta memunculkan permasalahan utamayaitu total jarak perpindahan material yang semakinbertambah karena proses produksi yang harus melewati keduagedung tersebut. Tugas akhir ini hanya berfokus pada tahapanmekanik dalam produksi dental aerosol. Tujuan dari analisis iniyaitu merancang usulan penempatan mesin secara teratur agardapat meminimalisir total jarak perpindahan material danpergerakan operator.Dalam melakukan penelitian ini, metode yang digunakanuntuk membantu mengkonstruksikan rancangan usulan tataletak fasilitas adalah algoritma CORELAP. Kemudianrancangan usulan tidak dicerna secara mentah melainkanmenambahkan beberapa penyesuaian tambahan di lapanganpada hasil rancangan algoritma CORELAP sehingga mampumeminimalisir total jarak perpindahan material dengan jaraktempuh yang lebih kecil pada produk dental aerosol. Darirancangan usulan algoritma CORELAP juga mampumemperoleh tingkat efektivitas dan efisiensi total jarakperpindahan material sebesar 378 m dan 50% karena mayoritasmesin yang digunakan dalam memproduksi dental aerosol telahditempatkan secara berdekatan agar tidak menghambatperpindahan material dan pergerakan operator saat kegiatanproduksi. Kata kunci — Tata Letak Fasilitas, Perpindahan Material,Penambahan Gedung Produksi, CORELAP.
Assessment of project management maturity in EPC company using project management maturity model (PMMM) framework Candrikha Revikesya; Ayudita Oktafiani; Intan Permatasari
Journal Industrial Servicess Vol 12, No 1 (2026): April 2026
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jiss.v12i1.34672

Abstract

Project performance, particularly in terms of schedule efficiency, remains a critical issue in Engineering, Procurement, and Construction (EPC) projects due to its inherent complexity. Previous studies have highlighted that insufficient project management capability is a key factor contributing to project delays and inefficiencies. However, empirical studies examining project management maturity in EPC organizations remain limited. This study aims to assess the project management maturity level of an EPC organization using the Project Management Maturity Model (PMMM). A quantitative approach was employed using a structured self – assessment questionnaire covering ten project management knowledge areas. The data were analyzed using ordinal measurement, where the maturity level was determined based on the lowest maturity score across all knowledge areas. The results indicate that the organization is at Level 2 of maturity, with variations across knowledge areas ranging from Level 2 to Level 4. Critical areas, project resource management, were identified as having lower maturity levels. These findings suggest that although basic project management processes already exist, their implementation remains inconsistent and not yet standardized across the organization. The study also highlights the importance of advancing toward higher maturity levels to improve consistency, coordination, and project performance. The findings contribute to the understanding of project management maturity in EPC environments and provide practical insights for organizations to enhance their project management capability.
Co-Authors Al Rasyid, Fakhri Harun Alip, Muhammad Yusuf Assidiq, 1stMuhammad Rezki Aulia Yogi Fachlivan Candrikha Revikesya Dania Qatrunnada Daryatno, Dinda Azzahra Denny Sukma Eka Atmaja Dida Diah Damayanti Endang Budiasih Fahriandoni, Syafiq Kemal Feiliana Feiliana Giovanny, Tengku Khalida Zia Haris Rachmat Hawari, Lativ Intan Permatasari Jeremy Ray Cristian Lintong Tarnama Lumbantoruan Lukman, Harits Faishal Miftah, Nadila Attin Muhammad Nashir Ardiansyah Murman Dwi Prasetio Murni Dwi Astuti Nadila Attin Miftah Naila, Helena Dinda Putri Nopendri Nopendri Pahlevi, Sinta Pratya Poeri Suryadhini Sandhika, Preity Shinta Adriana Sevhira Ivani Aswir Sri Widaningrum Suryandhini, Pratya Poeri Taryana, Galih Purnama Tatang Mulyana Teguh Prasetyo Wening Ayomi Dhara Setyani Wicaksono, Fahry Wirayudha, Umar Wiyono Wiyono Yulianti, Femi