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Penentuan Waktu antar Pemesanan Optimal untuk Model Persediaan Probabilistik Multi-Item dengan All-Units Discount dan Kendala Kapasitas Gudang Koswara, Handi; Lesmono, Dharma
Performa: Media Ilmiah Teknik Industri Vol 17, No 1 (2018): PERFORMA Vol. 17, No 1 Maret 2018
Publisher : Program Studi Teknik Industri, Universitas Sebelas Maret

A good inventory management becomes crucial for a company since it is related to some inventory costs. In managing inventory, in general we need to determine the optimal order quantity and the optimal time to order. In some cases, when supplier offers discount, a company tends to accept this offer although it needs to consider its storage capacity. In this paper, we develop a multi-item probabilistic inventory model with all-units discount and storage space restriction. We employed the Kuhn-Tucker Conditions to find the optimal order policy. From the numerical experiments, we found that when the storage capacity increases then the optimal time to order and the optimal quantity increase but the total cost decreases.

MODEL PERSEDIAAN DENGAN PERMINTAAN BERGANTUNG PADA HARGA JUAL DAN TINGKAT PERSEDIAAN DENGAN FAKTOR DETERIORASI Adiani, Widyoretno; Lesmono, Dharma; Limansyah, Taufik
Jurnal Ilmiah Teknik Industri Vol. 18, No. 2, Desember 2019
Publisher : Muhammadiyah University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/jiti.v18i2.8749

Inventory management and control are needed, especially for retailers, to make their business run smoothly. Inventory management is related to the purchase, storage, and sale of goods. Therefore, the determination of the right amount of inventory in hands is crucial in this situation. Low inventory levels will cause a higher probability of shortage, but on the other hand, having a lot of inventory in hands will incur higher holding costs, extra storage space, and deterioration of goods in hands. In this paper, we propose an inventory model with the inventory and price-dependent demand. We also consider a deterioration factor in our model. There are two models developed in this paper, namely the linear deterioration rate model with constant holding cost and the model of the deterioration rate with Weibull distribution with linear time-dependent holding cost. The purpose of the model is to find the optimal price and ending inventory level that maximizes the average profit. Sensitivity analysis is also performed to find the effect of parameter changes in our model to the optimum solution. We found that model with Weibull deterioration rate and linear holding costs will give a higher average profit.

A Model to Choose Hub and Route Determination Kevin, Kevin; Aritonang, Y. M. Kinley; Lesmono, Julius Dharma
Jurnal Teknik Industri Vol 20, No 2 (2019): August
Publisher : Department Industrial Engineering, University of Muhammadiyah Malang

Determining a transport hub is a strategic decision to build a good distribution flow. In this paper, We suggested a model for choosing hub locations as sources for companies. In previous studies, The determination of hub locations with a vehicle routing problem is not integrated. Therefore, This study built a model to assess the position of the hubs by considering the budget. The business should have a decision on vehicle routing with hubs to reduce total transport costs. In addition, the method of distribution of goods for hubs and non-hubs with third-party logistics was determined by the use of a vehicle routing problem. The optimal weight obtained through the analysis of sensitivity. In the sensitivity analysis, This study found that the best choice in this study was to use a weight of 0.9â€“1.0. This provides the lowest total cost of transport.

MODEL PERSEDIAAN PROBABILISTIK SATU JENIS BARANG DENGAN MELIBATKAN FAKTOR ALL UNIT DISCOUNT J. Dharma Lesmono; Taufik Limansyah
Research Report - Engineering Science Vol. 2 (2012)
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.279 KB)

Persediaan merupakan salah satu faktor yang penting dalam suatu perusahaan untukmenjamin kelancaran suatu proses produksi/usaha bisnis bagi perusahaan yangbersangkutan. Dalam dunia industri, sering dijumpai bahwa supplier akan memberikanpotongan harga (diskon) kepada perusahaan bila perusahaan membeli barang dalam jumlahtertentu. Faktor diskon yang diberikan oleh supplier dapat dimanfaatkan oleh perusahaanuntuk menurunkan biaya total persediaan. Namun perlu dipertimbangkan juga bahwadengan pembelian bahan baku/barang dalam jumlah banyak akan meningkatkan biayasimpan dan biaya perawatan yang secara langsung akan meningkatkan biaya totalpersediaan. Oleh sebab itu, dalam penelitian ini akan dibahas mengenai model persediaanbarang dengan melibatkan faktor all unit discount dengan permintaan yang probabilistik.Dari model ini akan diperoleh kuantitas pemesanan yang optimal yang akanmeminimumkan biaya total persediaan.

Komunitas Ibu Belajar Matematika (IBM) 2015 Ferry Jaya Permana; Agus Sukmana; Benny Yong; Dharma Lesmono; Erwinna Chendra; Farah Kristiani; Iwan Sugiarto; Liem Chin; Livia Owen; Maria Anestasia; Taufik Limansyah
Research Report - Engineering Science Vol. 2 (2015)
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1683.729 KB)

Program pengabdian bagi pembangunan masyarakat “Ibu Belajar Matematika (IBM)” diselenggarakan oleh para dosen dan mahasiswa Program Studi Matematika UNPAR sejak tahun 2012. Program ini bertujuan memberdayakan para ibu siswa Sekolah Dasar agar dapat membantu putra-putrinya belajar matematika di rumah. Umumnya para ibu tersebut melaksanakan kegiatan yang kurang produktif, seperti mengobrol, ketika menunggu putra-putrinya bersekolah. Dengan membentuk komunitas IBM, kegiatan yang kurang produktif tersebut dialihkan ke dalam kelas melalui kegiatan tutorial yang interaktif sehingga dapat menjadi bekal bagi para ibu tersebut ketika harus mendampingi putra-putrinya belajar matematika di rumah. Kegiatan tersebut berdampak positif, seperti meningkatkan kepercayaan para ibu dalam pendampingan putra-putrinya belajar matematika di rumah dan meningkatkan rasa hormat dari para siswa terhadap ibu mereka karena ibu mereka kini memiliki kemampuan membantu mereka belajar matematika di rumah. Diharapkan kegiatan tersebut kelak dapat meningkatkan prestasi belajar siswa-siswa sekolah dalam mata pelajaran matematika. Program tahun ini melibatkan lima sekolah mitra yang berlokasi disekitar Kampus UNPAR di Ciumbuleuit yaitu: SDN Bandung Baru 1, SDN Bandung Baru 2, SDN Ciumbuleuit 1, 3 dan 4. Komunitas IBM dibentuk di tiap-tiap sekolah melalui kegiatan di kelas dengan frekuensi 2 kali per minggu, masing-masing pertemuan berlangsung selama 45 – 60 menit.

A Model to Choose Hub and Route Determination Kevin Kevin; Y. M. Kinley Aritonang; Julius Dharma Lesmono
Jurnal Teknik Industri Vol. 20 No. 2 (2019): August
Publisher : Department Industrial Engineering, University of Muhammadiyah Malang

Determining a transport hub is a strategic decision to build a good distribution flow. In this paper, We suggested a model for choosing hub locations as sources for companies. In previous studies, The determination of hub locations with a vehicle routing problem is not integrated. Therefore, this study built a model to assess the position of the hubs by considering the budget. The business should have a decision on vehicle routing with hubs to reduce total transport costs. In addition, the method of distribution of goods for hubs and non-hubs with third-party logistics was determined by the use of a vehicle routing problem. The optimal weight was obtained through the analysis of sensitivity. In the sensitivity analysis, this study found that the best choice in this study was to use a weight of 0.9–1.0. It provides the lowest total cost of transport.

A Routing Model for Hybrid Hub-and-Spoke with Time Windows Felix Arya Gunadi; Dharma Lesmono; Kinley Aritonang
Jurnal Teknik Industri Vol. 21 No. 1 (2020): February
Publisher : Department Industrial Engineering, University of Muhammadiyah Malang

Currently, the company competition is getting tighter. Distribution companies need to provide excellent service to their customers to maintain their competitiveness. Distribution service performance could be measured with lead time. However, Reducing lead times may increase costs. This problem could be solved using freight consolidation and reducing backhaul. Freight consolidation can be done by using a hub-and-spoke network with a combination of inbound and outbound distribution. This study developed a route model for hybrid hub-and-spoke with time windows. This model determined the routes for shipping goods to consumers and taking products to suppliers using the same vehicle to reduce the backhaul. This model also conducted freight consolidation at the hub. The decision variables in this model included the routes of delivery to consumers, the collection of goods at the suppliers, the number of products distributed through the hub and direct shipping, and the excellent distribution route. This model was implemented into the problems. Besides, a sensitivity analysis of the model was carried out.

The Model for Location Routing Problem with Roaming Delivery Locations Stefanus Ivan Laksono; Y. M. Kinley Aritonang; Julius Dharma Lesmono
Jurnal Teknik Industri Vol. 21 No. 2 (2020): August
Publisher : Department Industrial Engineering, University of Muhammadiyah Malang

The Location Routing Problem with Roaming Delivery Locations (LRPRDL) is a model that represents company activities in delivering products to final customers. Direct delivery to final customers has increased significantly over the growth of e-commerce in the world. E-commerce or business-to-customer companies are urged to increase their last-mile distribution efficiency to survive in the global competition. For that purpose, the LRPRDL model was proposed to increase the efficiency of the company’s last-mile distribution. The model aims to minimize the sum of open depots and transportation costs by determining the number and location of depots and the shipping routes. The LRPRDL was implemented in an instance with four depot candidates, 15 customers, and six vehicles. The instance was solved to the optimality by using a public solver Gurobi. Furthermore, this research conducted a sensitivity analysis on the open depots and fuel costs, customer demand, and radius. The study indicated that customer’s demand and radius have a significant impact on the purchase decision.

Model Persediaan dengan Permintaan Bergantung pada Harga Jual dan Tingkat Persediaan dengan Faktor Deteriorasi Widyoretno Adiani; Dharma Lesmono; Taufik Limansyah
Jurnal Ilmiah Teknik Industri Vol. 18, No. 2, Desember 2019
Publisher : Department of Industrial Engineering Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/jiti.v18i2.8749

Inventory management and control are needed, especially for retailers, to make their business run smoothly. Inventory management is related to the purchase, storage, and sale of goods. Therefore, the determination of the right amount of inventory in hands is crucial in this situation. Low inventory levels will cause a higher probability of shortage, but on the other hand, having a lot of inventory in hands will incur higher holding costs, extra storage space, and deterioration of goods in hands. In this paper, we propose an inventory model with the inventory and price-dependent demand. We also consider a deterioration factor in our model. There are two models developed in this paper, namely the linear deterioration rate model with constant holding cost and the model of the deterioration rate with Weibull distribution with linear time-dependent holding cost. The purpose of the model is to find the optimal price and ending inventory level that maximizes the average profit. Sensitivity analysis is also performed to find the effect of parameter changes in our model to the optimum solution. We found that model with Weibull deterioration rate and linear holding costs will give a higher average profit.

ANALISIS SENSTIVITAS MODEL P(R,T) MULTI ITEM DENGAN ADANYA KENAIKAN HARGA Handi Koswara; Dharma Lesmono
Prosiding Semnastek PROSIDING SEMNASTEK 2015
Publisher : Universitas Muhammadiyah Jakarta

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

Persediaan merupakan faktor penting dalam perusahaan karena di dalam persediaan terdapat beberapa biaya, diantaranya biaya penyimpanan, biaya pemesanan, biaya pembelian, dan biaya kekurangan persediaan. Dalam kenyataan, perusahaan dapat memesan lebih dari satu bahan baku ke supplier. Di dalam dunia industri, supplier seringkali mengumumkan kenaikan harga, tetapi waktu kenaikan harga tidak diketahui oleh perusahaan. Karena waktu kenaikan harga yang tidak menentu, maka perusahaan akan sulit untuk menentukan apakah perlu untuk melakukan special order atau tidak. Pada penelitian ini dikembangkan model persediaan periodic review dimana terdapat enam buah barang dengan dua barang diantaranya mengalami kenaikan harga. Di dalam penelitian ini juga dilakukan analisis sensitivitas terhadap waktu kenaikan barang. Dengan mempertimbangkan semua kemungkinan waktu kenaikan harga, dapat ditentukan apakah special order perlu dilakukan atau tidak.

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