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All Journal JOURNAL OF SCIENCE AND SOCIAL RESEARCH Jurnal Sistem Teknik Industri Nawadeepa: Jurnal Pengabdian Masyarakat
Tarigan, Indah Rizkya
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Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Public Health Social Sciences Transportation Other

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Collaborative Planning, Forecasting, and Replenishment (CPFR) to Reduce Bullwhip Effect: Case Study Tarigan, Indah Rizkya; Tambunan, Mangara Mangapul; Rimbawan, Ericko Wasita
Jurnal Sistem Teknik Industri Vol. 25 No. 2 (2023): JSTI Volume 25 Number 2 July 2023
Publisher : TALENTA Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsti.v25i2.10601

Abstract

Supply chain is basically an integrated system in the process of preparing and delivering products to consumers. This chain is also a network of numerous businesses that are interrelated and have a common objective. This company, which is engaged in the processing of soy sauce using soybeans as its raw material, produces sweet soy sauce and salty soy sauce. Production policy used in this industry was based on the number of requests at the store's sales area and the demand to anticipate fluctuating demand were added 10%. Inaccuracies in the number of requests result in a varied difference between the number of requests and the number of sales, causing overstocking when demand decreases or stockouts when supplies cannot meet demand or commonly known as the bullwhip effect. Based on these problems, this study aims to obtain the right production policy to minimize the bullwhip effect using the CPFR framework. The results of this study show that the bullwhip effect values ​​for sweet and salty soy sauce are 0.812 and 0.814, respectively.
PERBAIKAN PROSES PRODUKSI TIANG LAMPU MENGGUNAKAN METODE VALUE STREAM ANALYSIS TOOLS (VALSAT) Sari, Rahmi M.; Yuman, Syafiq Alhadi; Ishak, Aulia; Tarigan, Indah Rizkya
JOURNAL OF SCIENCE AND SOCIAL RESEARCH Vol 8, No 3 (2025): August 2025
Publisher : Smart Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54314/jssr.v8i3.4276

Abstract

Abstract:In the current modern era, the competitive situation of the manufacturing industry has increased and is very tight. The importance of production efficiency in a company is to increase revenue, which is the goal of every company by minimizing waste. One approach used to minimize waste is lean manufacturing. The study was conducted on a company that produces and markets products in the form of lamp posts on public roads and toll roads. The problem that often occurs in the manufacturing process of product items is that many production processes are not achieved according to the standard time set by the Company. In this study, a Lean Manufacturing analysis was carried out to improve the lamp post production process using the Value Stream Analysis Tools (Valsat) method. Based on this study, the type of waste waiting is the most dominant type of waste with a percentage of 19.55%. In second place is the type of waste overproduction with a cumulative percentage of 18.54% while waste motion is 17.32%. Based on the current state value stream mapping, the process cycle efficiency of the Hexagonal Lamp Post manufacturing process is 98%.  Keyword:Lean Manufacturing, Waste, Value Stream Analysis Tools, Process Cycle  Efficiency  Abstrak:Pada era modern saatinisituasipersainganindustri manufakturmengalamikenaikan dan sangat ketat.Pentingnyaefisiensiproduksidalamsebuahperusahaanadalahuntukmeningkatkanpendapatandimanahalinimerupakantujuansetiap perusahaandenganmemperkecilterjadinyawaste. Salah satupendekatan yang digunakanuntukmeminimalisirwasteadalahlean manufactring.Penilitiandilakukan pada perusahaan yang memproduksisertamemasarkanprodukberupatiang-tianglampu yang ada di jalanruasjalanumum dan jalantol. Permasalahan yang seringterjadi pada proses manufaktur item produkmasihbanyak proses produksi yang tidaktercapaidengansesuaiwaktustandar yang sudahditetapkan oleh Perusahaan. Dalam penelitianini, dilakukananalisisLeanManufacturinguntukperbaikan proses produksitianglampumenggunakanmetodeValueStreamAnalysisTools (Valsat). Berdasarkanpenelitiantersebutdiperolehjeniswaste waitingmerupakanjeniswaste yang paling mendominasidenganpersentasesebesar 19,55%. Pada urutankeduaterdapatjeniswaste overproductiondenganpersentasekumulatifsebesar 18,54% sedangkanwaste motionsebesar 17,32 %. Berdasarkancurrent state value stream mapping, process cycle eficiency proses pembuatanTiangLampu Hexagonal diperolehnilai 98 %.  Kata kunci:Lean Manufacturing, Waste, Value Stream Analysis Tools, Process Cycle  Efficiency 
Increasing Production Productivity by Improving Facility Layout Using the BLOCPLAN Method, Systematic Layout Planning, and Differential Evolution Algorithm Tarigan, Ukurta; Sembiring, Meilita Tryana; Tarigan, Indah Rizkya; Syahpturi, Khalida
Jurnal Sistem Teknik Industri Vol. 27 No. 3 (2025): JSTI Volume 27 Number 3 July 2025
Publisher : TALENTA Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsti.v27i3.19705

Abstract

A furniture company that produces dining chairs, coffee tables, and sofa has a common problem, namely the company's inability to complete production targets within the specified time period. These general problems are the result of less efficient production paths because there is backtracking, by-passing, cross movement, and material transfer between stations that are far apart. This problem can be resolved by using improvements to the production floor layout using BLOCPLAN, Systematic Layout Planning, and Algorithms Differential Evolution. This research aims to design a production floor layout that can minimize distance, total movement moment, and material handling costs, with a line efficiency rate above 75%. The results of this research show that the proposed layout was selected using the Differential Evolution Algorithm with a displacement distance of 231.24 meters, a total displacement moment of 15,820.93 meters/month, material handling costs of IDR 1,865,920/month, and a line efficiency rate of 81.94 %.
Alat Potong Mekanis Mengatasi Keluhan Sakit Perajin Kerupuk Jangek Anizar, Anizar; Yahya, Idhar; Siregar, Khawarita; Syahputri, Khalida; Tarigan, Indah Rizkya; Erwin, Erwin
Nawadeepa: Jurnal Pengabdian Masyarakat Volume 2, No 4 (2023): December
Publisher : Pencerah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58835/nawadeepa.v2i4.245

Abstract

This community service activity brought about a change in the process of cutting “kerupuk jangek” by providing a mechanical cutting tool powered by a dynamo, along with an adjustable cutting size capacity of 200 kg/hour. Previously, the production process of “kerupuk jangek” was done manually, but the cutting process was time-consuming. Craftsmen used to cut the skin while sitting on a 45 cm high wooden bench. Their right hand continuously operated the knife with the right shoulder raised, while the left hand held the sheet of skin and the neck was bent. Every day, the craftsmen manually cut 240 sheets of shin with a knife for 3 hours of work. The manual process often resulted in tired fingers and accidents where their fingers came into contact with the knife blade due to fatigue and the absence of a barrier between their finger and the knife blade. The delayed cutting process also affected the drying process, preventing the “kerupuk” from expanding properly during frying and causing a defect rate of more than 5%. The method used in this activity is providing information, training and assistance in using ergonomic work facilities. The use of the mechanical cutting tool resulted in a shorter buffalo skin-cutting process, and craftsmen were fed from bodily discomfort and potential injuries caused by contact with the knife blade.
Co-Authors Anizar Anizar Aulia Ishak Erwin Erwin Idhar Yahya Khalida Syahputri Khawarita Siregar Meilita Tryana Sembiring, Meilita Tryana Rahmi M Sari Rimbawan, Ericko Wasita Syahpturi, Khalida Tambunan, Mangara Mangapul Ukurta Tarigan Yuman, Syafiq Alhadi