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All Journal J@TI (TEKNIK INDUSTRI) Industrial Engineering Online Journal Sinergi Jurnal Pengabdian Sosial
Hapsari, Chaterine Alvina Prima
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EVALUASI PENGADAAN MATERIAL DAN PENGOPTIMALAN BIAYA PERSEDIAAN PADA SEGEL KWH METER DENGAN METODE EOQ DAN PERIODIC REVIEW (STUDI KASUS PT PLN (PERSERO) UP3 SEMARANG) Ramadhani, Rizki Indrasari; Hapsari, Chaterine Alvina Prima
Industrial Engineering Online Journal Vol 13, No 4 (2024): WISUDA PERIODE OKTOBER TAHUN 2024
Publisher : Program Studi Teknik Industri, Fakultas Teknik, Universitas Diponegoro

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Abstract

AbstrakListrik menjadi faktor penting dalam keberlangsungan sektor industri karena memegang kendali atas sumberenergi mesin yang digunakan pabrik. Persediaan material kelistrikan menjadi hal yang krusial untukkelancaran pengaliran listrik, sehingga ketersediaan dalam gudang juga harus diperhatikan. Penelitian inibertujuan untuk mengevaluasi kebijakan pengadaan material segel kWh meter serta menganalisis dampakbiaya inventory yang dihasilkan. Segel kWh meter merupakan alat yang berfungsi sebagai pendampingutama material dasar utama (MDU) dan menjadi pengaman kWh meter agar terhindar dari pemakaian tidakterukur oleh pelanggan. Penelitian ini menggunakan metode Economic Order Quantity (EOQ) dan PeriodicReview dalam mengidentifikasi kuantitas pemesanan material berdasarkan peramalan data historis PT PLN(Persero) UP3 Semarang. Biaya inventory yang diperhitungkan terdiri atas biaya simpan dan biaya pesanakan dibandingkan antara kondisi biaya existing perusahaan. Hasil perhitungan biaya akan menentukanmetode perbaikan yang diusulkan. Hasil dari pengolahan menggunakan metode EOQ menghasilkanpenghematan biaya sebesar 11,2% apabila dibandingkan dengan existing. Metode Periodic Reviewmenghasilkan penghematan sebesar 35,38% dibanding kondisi existing. Kedua metode perbaikanmengusulkan jumlah safety stock segel kWh meter dalam gudang sebesar 660 buah berdasarkan lead time,service level, dan demand perusahaan. Diperoleh kesimpulan bahwa metode Periodic Review menjadimetode yang direkomendasikan untuk mengelola material dengan mempertimbangkan biaya-biaya terkait.Kata kunci: Pengadaan Material, Economic Order Quantity, Periodic Review, Optimasi Biaya AbstractElectricity is an important factor in the sustainability of the industrial sector because it controls the energysource of the machines used by the factory. The supply of electrical materials is crucial for the smooth flowof electricity, so the availability in the warehouse must also be considered. This research aims to evaluatethe kWh meter seal material procurement policy and analyze the impact of the resulting inventory costs. The kWh meter seal is a tool that functions as the main companion to the main base material (MDU) and becomes a kWh meter safety to avoid unmeasured usage by customers. This research uses the EconomicOrder Quantity (EOQ) and Periodic Review methods to identify the quantity of material ordered based onhistorical data forecasting of PT PLN (Persero) UP3 Semarang. Inventory cost consists of storage andorder cost will be compared between the company's existing cost condition. The cost calculation result willdetermine the proposed improvement method. The EOQ method resulted in cost savings of 11.2% comparedto existing. The Periodic Review method produces savings of 35.38% compared to existing conditions. Bothimprovement methods propose a safety stock amount of kWh meter seals in a warehouse of 660 pieces basedon lead time, service level, and company demand. It is concluded that the Periodic Review method is therecommended method for managing materials by considering the associated costs.Keywords: Procurement, Economic Order Quantity, Periodic Review, Cost Optimization
ANALISIS KEPUTUSAN PENGAJUAN SUBCONTRAK PADA PROSES BORDIR DENGAN ANALISIS WHAT-IF (Studi Kasus: PT. Sandang Asia Maju Abadi) Saragih, Otniel Joe Anggi; Hapsari, Chaterine Alvina Prima
Industrial Engineering Online Journal Vol 13, No 4 (2024): WISUDA PERIODE OKTOBER TAHUN 2024
Publisher : Program Studi Teknik Industri, Fakultas Teknik, Universitas Diponegoro

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Abstract

Abstrak PT. Sandang Asia Maju Abadi merupakan perusahaan yang bergerak dalam industri garmen denganproses produksi Make To Order (MTO). Dalam proses pembuatan celana denim terdapat beberapaproses salah satunya adalah proses bordir. Pada proses bordir perusahaan sering mengalami kendaladi mana lini produksinya tidak sanggup untuk memenuhi permintaan. Untuk mengatasi masalahtersebut perusahaan biasanya melakukan kegiatan subkontrak. Hal tersebut mengakibatkanperusahaan harus mengeluarkan biaya tambahan untuk melaksanakan subkontrak yang mengakibatkanpeningkatan biaya produksi. Berdasarkan hal tersebut dilakukan analisis dengan what-if analysisterkait keputusan pengajuan subkontrak pada proses bordir sehingga dapat mengetahui apakahkeputusan tersebut sudah merupakan keputusan terbaik. Analisis dilakukan dengan membandingkanbiaya yang dikeluarkan antara pemberian overtime dengan melakukan subkontrak. Perusahan dapatmemberi keputusan terbaik terkait permasalahan dalam proses bordir. Setelah dilakukan analisis whatif,berdasarkan perhitungan simulasi percobaan menunjukkan bahwa perusahaan mampu untukmemenuhi sebagian besar permintaan dengan melakukan overtime tanpa adanya subkontrak. Prosesproduksi dapat berjalan dengan optimal bila perusahaan dapat memaksimalkan penggunaan mesinyang ada. Perusahaan juga dapat menambahkan jumlah mesin produksi sehingga dapat memenuhipermintaan yang tinggi.Kata Kunci: Analisi What-if; Industri Garmen; Proses Bordir Abstract [Analysis of Decisions for Subcontract Submission in the Embroidery Process Using What-IfAnalysis (Case Study: PT Sandang Asia Maju Abadi)]. PT. Sandang Asia Maju Abadi is a companyengaged in the garment industry with a Make To Order (MTO) production process. In the process ofmaking denim pants, there are several processes, one of which is the embroidery process. In theembroidery process, companies often experience problems where their production lines are unable tomeet demand. To overcome this problem, companies usually carry out subcontracting activities. This results in the company having to incur additional costs for subcontracting, which leads to an increase in production costs. Based on this, an analysis with what-if analysis is carried out regarding the decisionto subcontract in the embroidery process, in order to determine whether it is the best decision. Theanalysis is conducted by comparing the costs incurred between granting overtime and subcontracting.The company can make the best decisions regarding problems in the embroidery process. Afterconducting the what-if analysis, based on experimental simulations, it shows that the company is ableto fulfill most of the demand by using overtime without subcontracting. The production process can runoptimally if the company can maximize the use of existing machines. The company can also addproduction machines to meet high demand.Keywords: Embroidery Process; Garment Industry; What-if analysis
PENERAPAN METODE FORECASTING PENGADAAN MATERIAL KWH METER DAN MCB PADA ULP SEMARANG Pratiwi, Novena Yora; Hapsari, Chaterine Alvina Prima
Industrial Engineering Online Journal Vol 13, No 4 (2024): WISUDA PERIODE OKTOBER TAHUN 2024
Publisher : Program Studi Teknik Industri, Fakultas Teknik, Universitas Diponegoro

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Abstract

AbstrakPT PLN merupakan BUMN yang menyelenggarakan usaha penyediaan tenaga listrik untuk kepentinganumum serta memupuk keuntungan pemerintah. PT PLN UP3 Semarang memiliki fokus dalam pemenuhankebutuhan pasang baru, penambahan daya, serta distribusi material listrik untuk tujuh Unit LayananPengadaan (ULP) di Semarang. Dua material listrik yaitu KWH meter dan MCB merupakan material yangpaling banyak digunakan dan sering kekurangan stok karena merupakan material yang wajib digunakanketika akan melakukan pemasangan baru maupun penambahan daya listrik. Permasalahan yang terjadiyaitu kebutuhan konsumen setiap bulan yang cenderung sulit untuk diprediksi dan fluktuatif sehinggapengadaan material juga sulit diperkirakan. Hal ini menimbulkan permasalahan yaitu ketika adapermintaan material dari ULP, tetapi persediaan material pada gudang PT PLN UP3 kurang, makakonsumen perlu menunggu lebih lama untuk pemasangan listrik. Hal ini akan berpengaruh kepadapendapatan perusahaan yang besarnya dipengaruhi jumlah listrik yang didistribukan ke pelanggan.Sedangkan, listrik tidak dapat didistribusikan apabila material listrik belum terpasang. Saat ini belum adametode forecasting yang diterapkan untuk memperkiraan pengadaan material. Oleh karena itu, penelitianini bertujuan untuk memberikan usulan metode forecasting yang tepat untuk diterapkan pada masingmasingmaterial agar pengadaan material KWH meter dan MCB pada tujuh ULP dapat diperkirakandengan lebih baik untuk periode 2023. Data yang digunakan yaitu data pengadaan material listrik untuktujuh ULP Semarang tahun 2021 dan 2022. Metode forecasting yang digunakan yaitu metode DoubleExponential Smoothing, Holts Winter Multiplikatif, dan Dekomposisi Multiplikatif. Dilakukan juga metodeperhitungan error menggunakan metode MAD, MAPE, dan MSD serta validasi moving range dan uji Tuntuk menentukan metode forecasting terbaik. Didapatkan hasil yaitu metode forecasting terbaik untukmaterial KWH meter, MCB 4A, MCB 6A, dan MCB 10A berdasarkan nilai error terkecil dan telah lolos ujivalidasi adalah metode Dekomposisi Multiplikatif.Kata kunci: peramalan; material listrik; pengadaan Abstract[IMPLEMENTATION OF FORECASTING METHOD FOR PROCUREMENT OF KWH METERSAND MCB MATERIALS AT ULP SEMARANG] The PT PLN is a state-owned enterprise that provideselectricity for public purposes and generates profits for the government. PT PLN UP3 Semarang focuseson meeting the needs of new installations, power additions, and distributing electrical materials for sevenUnit Layanan Pengadaan (ULP) in Semarang. Two electrical materials, KWH meters and MCBs, are mostcommonly used and often face stock shortages because they are mandatory for new installations and poweradditions. The problem lies in monthly consumer demand, which is difficult to predict and fluctuate, makingit challenging to estimate material procurement. This issue leads to situations where there is a demand formaterials from the ULP, but the stock at the PT PLN UP3 warehouse is insufficient, causing customers towait longer for electrical installations. This, in turn, affects the company's revenue, which is influenced bythe amount of electricity distributed to the customers. However, electricity cannot be distributed if theelectrical materials are not installed. Currently, there is no applied forecasting method for estimatingmaterial procurement. Therefore, this study aims to propose an appropriate forecasting method to beimplemented for each material, enabling better estimation of the KWH meter and MCB materialprocurement for the seven ULPs for the period of 2023. The data used consisted of electrical materialprocurement data for the seven ULPs in Semarang for 2021 and 2022. The forecasting methods employedwere Double Exponential Smoothing, Holt's Winter Multiplicative, and Multiplicative Decomposition. Error calculations were performed using the MAD, MAPE, and MSD methods along with moving rangevalidation and t-tests to determine the best forecasting method. The results show that the best forecastingmethod for the KWH meters, MCB 4A, MCB 6A, and MCB 10A, based on the smallest error values andpassing the validation test, is the Multiplicative Decomposition method.Keywords: forecasting; electrical materials; procurement
ANALISIS PENGENDALIAN KUALITAS BOTOL AIR MINUM 600 ML DENGAN METODE SIX SIGMA (Studi Kasus: PT Tirta Investama Pabrik Klaten) Fortuna, Bella Budhi Dewi; Hapsari, Chaterine Alvina Prima
Industrial Engineering Online Journal Vol 13, No 3 (2024): WISUDA PERIODE JULI TAHUN 2024
Publisher : Program Studi Teknik Industri, Fakultas Teknik, Universitas Diponegoro

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Abstract

Abstrak Kebutuhan masyarakat terhadap air minum yang kian meningkat menyebabkan perusahaan Air MinumDalam Kemasan (AMDK) terus berlomba untuk meningkatkan dan menjaga kualitas demi menjagakepuasan konsumen. PT Tirta Investama Pabrik Klaten yang memproduksi air minum dengan merkdagang AQUA berupaya untuk meminimasi reject proses pada produksinya, termasuk pada botol airminum 600 mL. Dalam prosesnya, masih sering dijumpai reject yang melebihi target perusahaan, yaitusebesar 0,5%, sehingga dibutuhkan sebuah metode pengendalian kualitas. Analisis pengendalian kualitasdalam penelitian ini adalah metode six sigma menggunakan pendekatan siklus DMAIC (Define, Measure,Analyze, Improve, dan Control). Hasil penelitian menunjukkan bahwa jenis cacat yang paling seringmuncul, yakni botol tanpa cap dan volume air kurang. Dalam memproduksi satu juta produk, masihterdapat 1.138 unit cacat yang menandakan bahwa proses memiliki nilai 4,552????. Setelah dilakukananalisis menggunakan cause and effect diagram, diberikan rekomendasi perbaikan terkait faktor man,machine, method, material, dan environment yang dapat membantu perusahaan meminimasi reject prosessekaligus meningkatkan nilai sigma perusahaan. Kata Kunci: Six Sigma; DMAIC; Pengendalian Kualitas; Kualitas Abstract[Quality Control Analysis of 600 mL Bottled Drinking Water with Six Sigma Method (Study Case: PTTirta Investama Pabrik Klaten]. The increasing public need for drinking water causes bottled drinkingwater (AMDK) companies compete to improve and maintain their quality in order to maintain consumersatisfaction. PT Tirta Investama Pabrik Klaten, which produces drinking water under the AQUAtrademark seeks to minimize the reject process in its production, including on 600 mL drinking waterbottles. In the process, rejects exceeding the company's target of 0.5% are still frequently encountered,thus requiring a quality control method. The quality control analysis in this research is conducted usingthe six sigma method with the DMAIC cycle approach (Define, Measure, Analyze, Improve, and Control).The research findings indicate that the most common types of defects are bottles without caps andinsufficient water volume. In the production of one million products, there are still 1.138 defective units,indicating that the process has a value of 4,552σ. After conducting an analysis using a cause and effectdiagram, recommendations for improvement are provided regarding the factors of man, machine, method,material, and environment, which can assist the company in minimizing process rejects whilesimultaneously improving the company's sigma value. Keywords: Six Sigma; DMAIC; Quality Control; Quality
DESIGNING A COLLABORATIVE MODEL FOR THE RAW MATERIAL PROCUREMENT PROCESS TO ELEVATE THE FURNITURE INDUSTRY COMPETITIVENESS Hapsari, Chaterine Alvina Prima; Wicaksono, Purnawan Adi; Budiawan, Wiwik; Sari, Diana Puspita; Rahma, Atheea Annisa; Paramestha, Dominico Laksma
J@ti Undip: Jurnal Teknik Industri Vol 18, No 1 (2023): Januari 2023
Publisher : Departemen Teknik Industri, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jati.18.1.12-20

Abstract

The furniture industry is a non-oil and gas sector that can be developed aggressively due to the abundant natural resources provided by Indonesia's forests. However, there are several issues in the wooden furniture industry, starting on the upstream supply chain, especially in the raw material procurement process. The increasing product cost because of high procurement costs could make this industry hard to compete or grow. Thus, this study proposes an improvement of raw material procurement by developing a collaborative model to minimize the total circular procurement cost in the wooden furniture industry supply chain. Adopting the collaborative model is expected to reduce the raw material procurement costs of all parties involved in the supply chain by shortening the supply chain. In addition, this study built a dynamic system model with an implementation circular supply chain concept, which focuses on regenerating the wood raw material toward zero waste. The finding is that a collaborative model could reduce the total circular procurement cost by 25% to 35% compared to the base model. A recommendation for building the terminal comes from the collaborative model. The result of this study provides a solution to elevate the furniture industry's competitiveness through cost reduction.
Penerapan Lean Manufacturing untuk Meminimasi Pemborosan di IKM Logam Tegal Menggunakan 5S Sya'ban, Najwa Fathiya; Kinanti, Rifendha Lulu Qolbie; Rosyada, Zainal Fanani; Bakhtiar, Arfan; Hapsari, Chaterine Alvina Prima
Jurnal Pengabdian Sosial Vol. 2 No. 4 (2025): Februari
Publisher : PT. Amirul Bangun Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59837/09dc5w70

Abstract

Kegiatan pengabdian ini bertujuan untuk mengoptimalkan pemberdayaan Industri Kecil dan Menengah (IKM) logam di Kabupaten Tegal melalui pendekatan Lean Manufacturing dengan penerapan metode 5S (Seiri, Seiton, Seiso, Seiketsu, Shitsuke). Program ini dilaksanakan dalam bentuk Kuliah Kerja Nyata (KKN), yang berfokus pada dua perusahaan, yaitu PT Putra Pandawa Yudhistira dan CV Afiema Karya Putra. Pendekatan ini melibatkan pelatihan dan penerapan langsung 5S di lantai produksi untuk menciptakan lingkungan kerja yang lebih terstruktur, bersih, dan efisien. Partisipasi aktif karyawan dan manajemen menjadi bagian penting dalam keberhasilan program ini. Hasil kegiatan menunjukkan bahwa penerapan Lean Manufacturing dengan metode 5S berhasil menciptakan lingkungan kerja yang lebih rapi, bersih, dan efisien. Tahapan seperti penggunaan red tag dalam Seiri, penataan alat dalam Seiton, dan penyusunan SOP kebersihan pada Seiketsu terbukti efektif mengurangi pemborosan jenis motion dan transportation. Tantangan yang dihadapi berupa rendahnya pemahaman prinsip Lean di kalangan pelaku IKM, yang diatasi melalui pelatihan intensif dan pendampingan berkelanjutan. Dengan adanya program ini, IKM logam di Kabupaten Tegal Tegal dapat meningkatkan daya saing dan bisa lebih siap menghadapi tantangan di era industri yang terus berkembang. 
Evaluating the impact of autonomous material handling on the performance of production system: a simulation approach Purwaningsih, Ratna; Shintyastuti, Annisa Rahma; Arvianto, Ary; Hapsari, Chaterine Alvina Prima; Putri, Ade Aisyah Arifna; Dzulfikar, Rifki Daris
SINERGI Vol 29, No 2 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2025.2.004

Abstract

In developing countries, low employment rates lead to manual material handling due to low labor costs. This article analyzes the impact of transitioning from semi-manual to fully automatic material handling systems by replacing the hand pallet system with AGV for transporting materials on the production floor. A simulation model was created to evaluate the impact of the transition on cost and quality. The model focuses on production lines with predetermined pathways and fixed working hours for workstations. The discrete event simulation was developed using ExtendSim. Queuing theory model is employed to assess the utilization of resources within the system. Three scenarios are developed: a human system, systems with 2 AGVs, and 3 AGVs.The findings suggest that systems with AGVs surpass human-operated systems in terms of system reliability, cost-effectiveness, and product excellence. The findings provide essential insights for management decision-making, specifically for deterministic production lines. The research findings emphasize the possibility of significant enhancements in production system performance by implementing autonomous material handling.
Co-Authors Arfan Bakhtiar Ary Arvianto Diana Puspita Sari Dzulfikar, Rifki Daris Fortuna, Bella Budhi Dewi Kinanti, Rifendha Lulu Qolbie Paramestha, Dominico Laksma Pratiwi, Novena Yora Purnawan Adi Wicaksono Putri, Ade Aisyah Arifna Rahma, Atheea Annisa Ramadhani, Rizki Indrasari Ratna Purwaningsih Saragih, Otniel Joe Anggi Shintyastuti, Annisa Rahma Sya'ban, Najwa Fathiya Wiwik Budiawan Zainal Fanani Rosyada