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All Journal Jurnal Teknik Industri Jurnal Teknik Industri J@TI (TEKNIK INDUSTRI) Jurnal Ilmiah Teknik Industri PERFORMA : Media Ilmiah Teknik Industri Makara Journal of Technology

Wakhid Ahmad Jauhari

Jurusan Teknik Industri, Fakultas Teknik, Universitas Sebelas Maret

Author-ID : 291693

Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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MODEL PERSEDIAAN TERINTEGRASI PADA SISTEM SUPPLY CHAIN YANG MELIBATKAN PEMASOK, PEMANUFAKTUR DAN PEMBELI Jauhari, Wakhid Ahmad
Jurnal Ilmiah Teknik Industri Vol. 5, No. 2, Desember 2006
Publisher : Universitas Muhammadiyah Surakarta

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

In this paper we consider a single buyer-single manufacturer- single supplier supply chain problem where there are multiple deliveries for one buyerâs order and the manufacturer produces in a multiple integer of deliveries quantity. We also consider a lot size of raw material procurement which can be split from production batch. From numerical example we found that a value of material conversion factor and delivery frequency influences the total inventory cost . A high value of material conversion factor would make the buyerâs total inventory cost increase and the manufacturerâs total inventory costdecrease. High frequency of delivery would make the buyerâs total inventory cost decrease and the manufactureâs total inventory cost increase.

Perbaikan Min-Max Distribusi Dengan Multiple Criteria ABC Analysis NG-Model Untuk Pengoptimalan List Part Number Hanif, Zulhendra; Hisjam, Muhammad; Jauhari, Wakhid Ahmad
Jurnal Ilmiah Teknik Industri Vol. 18, No. 1, Juni 2019
Publisher : Muhammadiyah University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/jiti.v18i1.7727

PT GMF Aeroasia Tbk. is the largest MRO company in Indonesia. This company has 67 plants worldwide. With the many plants that must be serviced, the complex process of repairing aircraft with spare parts that exceeds 15,000 types. Part distribution is a very big challenge and must be faced by companies where part distribution is done with multi-stage warehouses. At present the main warehouse has problems with the inefficiency of the min-max distribution system at each plant where the system aims to bond the parts that have the greatest frequency of demand to the sub-warehouse at the plant. This study discusses the improvement of Min-Max distribution with ABC Analysis NG-Model Multiple Criteria which aims to improve the efficiency of the list part number with the frequency of order transfer requests and the most optimal performance at 9 internal plants with the largest part demand activity. The proposed method is known to be able to increase min-max accommodation including, Transfer Order frequency from 23% to 40.80% and weekly delivery performance from 22% to 62.69%. In addition, this method can also reduce the amount of part number on Min-max with the results of Transfer Order accommodation and increased performance from the methods currently used.

Analisis Pengendalian Persediaan Spare Part Mesin Produksi di PT. Prima Sejati Sejahtera dengan Metode Continuous Review Budiningsih, Endah; Jauhari, Wakhid Ahmad
Performa: Media Ilmiah Teknik Industri Vol 16, No 2 (2017): PERFORMA Vol. 16, No 2 September 2017
Publisher : Industrial Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret

PT. Prima Sejati Sejahtera as one of the subsidiaries of PT. Pan Brothers Tbk. which is engaged in garment production. The company's mechanical department in managing spare part inventory is still using intuitive method, where the number of spare part order for certain periods based on spare part demands data onto the previous period. The company’s mechanical department often stock out of spare parts. Spare part’s inventory management becomes a complex issue because of the need for fast response to handle the downtime of machines, and the risk of obsolescence of spare parts. So in this research will discuss about spare part inventory control which is started with spare parts grouping by using ABC analysis method to determine the appropriate inventory control method for each group. There are 23 spare parts which included in group A. The forecast of spare part’s demands to use Croston, Syntetos-Boylan Approximation (SBA) and Single Exponential Smoothing (SES). Comparison of each forecasting method will be determined by the value of forecasting errors (MAD). It is known that there are 12 spare parts with Croston method in the best forecasting method, 6 spare parts in Syntetos-Boylan Approximation (SBA) method and 5 spare parts with Single Exponential Smoothing (SES) method. Based on the best forecasting result, it will be calculated the value of safety stock (SS), reorder point (ROP) and the optimal number of ordering (Q) using Continuous Review method for each spare part.

Perancangan Peta Evakuasi Menggunakan Algoritma Floyd- Warshall untuk Penentuan Lintasan Terpendek: Studi Kasus Iftadi, Irwan; Jauhari, Wakhid Ahmad; Nugroho, Beny
Performa: Media Ilmiah Teknik Industri Vol 10, No 2 (2011): PERFORMA Vol. 10 No 2, September 2011
Publisher : Industrial Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret

Peta evakuasi sangat penting bagi suatu rumah sakit. Hal ini dikarenakan untuk mengurangi resiko saat terjadi bencana (gempa bumi) dan sebagai syarat akreditasi untuk memperoleh akreditasi suatu rumah sakit. Penelitian ini bertujuan untuk menyusun peta evakuasi dan penandaannya. Dengan perancangan peta evakuasi, diharapkan dapat terpenuhi salah satu syarat akreditasi rumah sakit dan memudahkan penghuni bangunan rumah sakit dalam mencari jalan tercepat saat keadaan darurat atau keadaan bahaya. Terdapat dua tahap dalam perancangan peta evakuasi. Tahap yang pertama ialah perancangan alur evakuasi dengan menggunakan Algoritma Floyd-Warshall untuk menentukan lintasan terpendek. Tahap kedua ialah penandaan peta evakuasi. Tahap pertama terdiri dari enam tahap, yaitu pembuatan block plan Rumah Sakit Umum Daerah Kabupaten Kebumen, penentuan letak titik berkumpul (assembly point), penentuan node, pemilahan titik berkumpul (assembly point) untuk masing-masing ruang, penentuan jarak masing-masing ruang ke titik berkumpul (assembly point), dan penentuan alternatif evakuasi. Tahap kedua merupakan perancangan penandaan peta evakuasi. Dalam hal ini, warna dan bahan penandaan peta evakuasi sesuai dengan Rumah Sakit Islam Surakarta. Penandaan peta evakuasi dibuat dari bahan acrlylic dan dipasang sepanjang jalur evakuasi. Hasil penelitian menunjukkan bahwa terdapat 40 ruang yang dapat langsung ditentukan lintasan evakuasinya dan 35 ruang ditentukan lintasan terpendeknya dengan menggunakan Algoritma Floyd-Warshall. Dari ketiga puluh lima ruang itu, 16 ruang menuju titik berkumpul sebelah utara, 5 ruang menuju titik berkumpul sebelah barat, dan 14 ruang menuju titik berkumpul sebelah selatan. Sehingga titik berkumpul sebelah utara menampung 39 ruang, titik berkumpul sebelah barat menampung 19 ruang, dan titik berkumpul sebelah selatan 17 ruang serta peta evakuasi telah disusun dan akan dipasang di tempat-tempat strategis sepanjang jalur evakuasi.

Model Pengukuran Kinerja dengan Menggunakan Metode Integrated Performance Measurement Systems dan Analytical Hierarchy Process Aisyati, Azizah; Jauhari, Wakhid Ahmad; Mulyaningtyas, Dwiningsih
Performa: Media Ilmiah Teknik Industri Vol 11, No 1 (2012): PERFORMA Vol. 11, No 1 Maret 2012
Publisher : Industrial Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret

Performance measurement is important to business organization both manufacturing or service industry, and education. Performance measurement considers all activities and satisfies stakeholder’s requirements. The aim of his research is to design performance measurement in a Department in X University using Integrated Performance Measurement Systems (IPMS) method. IPMS is a performance measurement method that considers stakeholder’s requirements and measure performance integrally. IPMS method generates Key Performance Indicators (KPI) from stakeholder’s requirements by four steps, that are; identification of stakeholder’s requirements, development of external monitor, objectives establishment, and identification of KPs. Each of KPI has difference significance to performancemeasurement system. The significance of each KPI is counted by Analytical Hierarchy Process (AHP). This research results 7 performance measurement perspectives that consist of 15 objectives. The objectives can be measured by 57 KPI (consist of 43 main KPI and 24 sub KPI)

Perancangan Sistem Pengukuran Kinerja Organisasi Non Profit (Studi Kasus pada UTDC PMI Surakarta) Jauhari, Wakhid Ahmad; Liquiddanu, Eko; Nugraheni, Eka Agustina
Performa: Media Ilmiah Teknik Industri Vol 9, No 1 (2010): PERFORMA Vol. 9, No. 1 Maret 2010
Publisher : Industrial Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret

In this paper we developed performance measurement system in UTDC PMI Surakarta. We used Integrated Performance Measurement System (IPMS) methodology which based on stackeholder’s requirement, to design the measurement system. From the design process, it can be identified 8 stakeholders, and based on stakeholder’s requirements, it can be obtained 27 requirements and 7 objectives. Furthermore, we developed 19 key performance indicators (KPIs) which can be classified into 6 aspects, including donor, human resources, blood preparation, output, administration, and control and evaluation.Finally, we conducted Analythic Hierarchy Process (AHP) method to weight the all aspects and KPIs. It was found that human resources(0.435) was most importance aspect and employee’s performance achievement (0.24) became most importance indicator among them.

Perancangan Ulang Tata Letak Fasilitas di PT. Dwi Komala dengan Metode Systematic Layout Planning Naganingrum, R. Pitaloka; Jauhari, Wakhid Ahmad; Herdiman, Lobes
Performa: Media Ilmiah Teknik Industri Vol 12, No 1 (2013): PERFORMA Vol. 12, No 1 Maret 2013
Publisher : Industrial Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret

PT. Dwi Komala is one of middle-scale industries that producing in footwear product. In production system, waste such as movement waste and excessive transportation, are commonly found and affect to unmet production target. This waste occurs because the work station placement does not consider the production process flow and spatial interconnectedness. One of solutions that can be done to repair the facility layout is redesigning the layout by considering production process flow and the relationship between any space in the layout. The layout of facilities in this company is not made based on the good planning but only adjusting with the existing space, so that irregular layout results. Meanwhile, the facility layout not taking into account the production process flow, production machineries placement and production activity requirement results in larger material handling cost and it will impact on the high production cost and production process time. For that reason, this research aims to produce the proposal of layout design that can minimize the material handling cost (MHC). In this research, the facility is redesigned using Systematic Layout Planning (SLP). The SLP procedure consists of three stages: analysis, adjustment and evaluation. The analysis stage includes material flow analysis, activity relationship chart (ARC), activity relationship diagram (ARD), area requirement analysis and available area analysis. The adjustment stage includes planning the spatial relationship diagram and alternative layout design. In evaluation stage, the evaluation was done on the alternative layout design. Three proposed layout which minimizes material handling cost could be resulted by Systematic Layout Planning (SLP) method. The first proposed layout gives a significant saving of 11.35% compare to existing layout. The second layout results in 31.17% saving while the last layout gives a saving of 32.44%. Thus, the third layout proposal was recommended as the selected layout proposal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/jiti.v5i2.1569

In this paper we consider a single buyer-single manufacturer- single supplier supply chain problem where there are multiple deliveries for one buyer?s order and the manufacturer produces in a multiple integer of deliveries quantity. We also consider a lot size of raw material procurement which can be split from production batch. From numerical example we found that a value of material conversion factor and delivery frequency influences the total inventory cost . A high value of material conversion factor would make the buyer?s total inventory cost increase and the manufacturer?s total inventory costdecrease. High frequency of delivery would make the buyer?s total inventory cost decrease and the manufacture?s total inventory cost increase.

Model Persediaan Pemasok-Pembeli Dengan Produk Cacat Dan Kecepatan Produksi Terkontrol. Sejati, Nelita Putri; Jauhari, Wakhid Ahmad; Rosyidi, Cucuk Nur
Jurnal Teknik Industri Vol 15, No 2 (2014): Agustus
Publisher : Department Industrial Engineering, University of Muhammadiyah Malang

In this paper, we consider a joint economic lot size (JELS) model consisting of single vendor single buyerwith single product. We intend to study the impact of defective items and controllable production rate onthe model. The demand in buyer side is assumed to be stochastic. The delivery of lot from vendor to buyer is conducted under equal size shipment and the lead time is assumed to be constant. The defective items founded by the inspector in buyer side are carried in buyerâ€™s storage until the next shipment and will be returned to the vendor. The goal of the proposed model is to determine optimal delivery frequency, review period and production rate by minimizing the joint total cost. A sensitivity analysis is performed to show the impact of the changes of the decision variables on modelâ€™s behavior. The result from the sensitivity analysis shows that the joint total cost is sensitive to the changes of defect rate, demand uncertainty and demand rate.Â

MODEL JOINT ECONOMIC LOT SIZE PADA KASUS PEMASOK-PEMBELI DENGAN PERMINTAAN PROBABILISTIK Jauhari, Wakhid Ahmad; Pujawan, I Nyoman; Wiratno, Stefanus Eko
Jurnal Teknik Industri Vol 11, No 1 (2009): JUNE 2009
Publisher : Institute of Research and Community Outreach - Petra Christian University

In this paper we consider single vendor single buyer integrated inventory model with probabilistic demand and equal delivery lot size. The model contributes to the current literature by relaxing the deterministic demand assumption which has been used for almost all integrated inventory models. The objective is to minimize expected total costs incurred by the vendor and the buyer. We develop effective iterative procedures for finding the optimal solution. Numerical examples are used to illustrate the benefit of integration. A sensitivity analysis is performed to explore the effect of key parameters on delivery lot size, safety factor, production lot size factor and the expected total cost. The results of the numerical examples indicate that our models can achieve a significant amount of savings. Finally, we compare the results of our proposed model with a simulation model. Abstract in Bahasa Indonesia: Pada penelitian ini akan dikembangkan model gabungan pemasok-pembeli dengan permintaan probabilistik dan ukuran pengiriman sama. Pada model setiap lot pemesanan akan dikirim dalam beberapa lot pengiriman dan pemasok akan memproduksi barang dalam ukuran batch produksi yang merupakan kelipatan integer dari lot pengiriman. Dikembangkan pula suatu algoritma untuk menyelesaikan model matematis yang telah dibuat. Selain itu, pengaruh perubahan parameter terhadap perilaku model diteliti dengan analisis sensitivitas terhadap beberapa parameter kunci, seperti ukuran lot, stok pengaman dan total biaya persediaan. Pada penelitian ini juga dibuat model simulasi untuk melihat performansi model matematis pada kondisi nyata. Kata kunci: model gabungan, permintaan probabilistik, lot pengiriman, supply chain

Co-Authors Akbar, Reza Rizkichani Ani Fatmawati Azizah Aisyati Bambang Suhardi Budiningsih, Endah Cucuk Nur Rosyidi Cucuk Nur Rosyidi Eko Liquiddanu Fatmawati, Ani Hanif, Zulhendra Hisjam, Muhammad I Gusti Ngurah Antaryama I Nyoman Pujawan Lobes Herdiman Mulyaningtyas, Dwiningsih Naganingrum, R. Pitaloka Nugraheni, Eka Agustina Nugroho, Beny Pramesti, Nidya Yutie Rahmaniyah Dwi Astuti Reza Rizkichani Akbar Sejati, Nelita Putri Stefanus Eko Wiratno Wardani, Serlita Vidinia

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