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All Journal Jurnal Teknik Industri Research Report - Engineering Science Prosiding Semnastek Jurnal Ilmiah Teknik Industri Jurnal Sains Matematika dan Statistika PERFORMA : Media Ilmiah Teknik Industri Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri BAREKENG: Jurnal Ilmu Matematika dan Terapan JTAM (Jurnal Teori dan Aplikasi Matematika) Society SUBAKTYA, Unpar Community Service Journal
Dharma Lesmono
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Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Physics Social Sciences Transportation

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MODEL PERSEDIAAN DETERMINISTIK DENGAN MEMPERTIMBANGKAN MASA KADALUARSA DAN PENURUNAN HARGA JUAL Cherish Rikardo; Taufik Limansyah; Dharma Lesmono
Prosiding Semnastek PROSIDING SEMNASTEK 2015
Publisher : Universitas Muhammadiyah Jakarta

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

Abstract

Persediaan merupakan salah satu faktor yang berperan besar dalam berjalannya suatu proses di perusahaan. Persediaan telah menjadi topik yang banyak diteliti dan dikembangkan dengan mempertimbangkan beberapa kondisi tertentu, seperti masa kadaluarsa. Pada penelitian ini akan dibahas mengenai suatu model matematis persediaan yang mempertimbangkan waktu kadaluarsa tertentu dan penurunan harga jual dari barang yang akan mengalami kadaluarsa. Pada penelitian ini, diasumsikan bahwa permintaan bersifat deterministik dan penurunan harga jual yang dilakukan dapat meningkatkan permintaan dari barang yang mendekati waktu kadaluarsa. Dalam penelitian ini akan dikembangkan suatu model matematis untuk menentukan  kuantitas barang yang dibeli, dan pada tingkat persediaan berapa penurunan harga dapat dilakukan yang meminimumkan total biaya persediaan tahunan.
Model Persediaan Multi Item dengan Mempertimbangkan Faktor Kedaluwarsa dan Faktor All Unit Discount Taufik Limansyah; Dharma Lesmono
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 13 No. 2 (2011): DECEMBER 2011
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (439.501 KB) | DOI: 10.9744/jti.13.2.87-94

Abstract

This paper deals with determination of ordering policy for perishable goods, namely joint order policy or individual order policy. Expiration date is an important factor to be considered in the inventory system, especially in chemical or food industry. The problem becomes more complicated when the company has more goods with different expired dates. Another factor that has an influence to the inventory system is the supplier discount factor. A company can get benefit from this factor in order to reduce a total cost of inventory. In this paper, performance’s criteria used for the selected policy is ordering policy that minimize the total cost of inventory by considering the expiration date and all unit discount.
Pengembangan Model Persediaan Continuous Review dengan All-Unit Discount dan Faktor Kadaluwarsa Cherish Rikardo; Dharma Lesmono; Taufik Limansyah
Jurnal Teknik Industri Vol. 19 No. 1 (2017): JUNE 2017
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (593.499 KB) | DOI: 10.9744/jti.19.1.29-38

Abstract

Paper ini membahas suatu model matematika untuk suatu sistem persediaan dengan mempertimbangkan adanya all-unit discount dan faktor kadaluwarsa. Permintaan barang bersifat deterministik yang merupakan fungsi dari waktu dan bergantung pada jumlah persediaan yang ada (inventory dependent demand), laju kadaluwarsa barang juga bergantung pada waktu dan tidak ada lead time. Model yang dibahas merupakan pengembangan dari Nagare dan Dutta [9] dengan menambah faktor all-unit discount dan laju kadaluwarsa yang bergantung pada waktu. Dari model yang dikembangkan akan ditentukan kuantitas pemesanan (economic order quantity) dan waktu antar pemesanan yang optimum yang meminimumkan total biaya persediaan tahunan. Algoritma penentuan solusi optimum dari model yang dikembangkan dan contoh numerik sebagai ilustrasi dari permasalahan persediaan ini diberikan. Analisis sensitivitas model dengan melihat pengaruh laju kadaluwarsa dan laju permintaan terhadap kuantitas dan waktu antar pemesanan yang optimal juga diberikan. Dari hasil analisis sensitivitas diperoleh bahwa semakin besar laju kadaluwarsa, maka waktu antar pemesanan menjadi semakin singkat dan kuantitas pemesanan menjadi semakin sedikit.  Hal yang sama terjadi jika laju permintaan barang semakin besar.   Kata kunci:  Persediaan, kadaluwarsa, all-unit discount.
Analisis Sistem Antrean di Puskesmas Dago dengan Simulasi Krismayanti, Monika; Lesmono, Dharma; Salim, Daniel
Jurnal Sains Matematika dan Statistika Vol 11, No 1 (2025): JSMS Januari 2025
Publisher : Universitas Islam Negeri Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24014/jsms.v11i1.26776

Abstract

Pemerintah memberikan kemudahan bagi masyarakat untuk mendapatkan pelayanan kesehatan melalui program BPJS (Badan Penyelenggara Jaminan Sosial) Kesehatan. Salah satu fasilitas kesehatan yang dapat menerima pengguna BPJS Kesehatan adalah Pusat Kesehatan Masyarakat (Puskesmas). Tingginya minat masyarakat untuk mendapatkan layanan kesehatan di Puskesmas dapat mengakibatkan antrean yang panjang di Puskesmas tersebut dan dapat menimbulkan kerugian untuk Puskesmas ataupun masyarakat. Untuk mempelajari sistem antrean di Puskesmas, akan digunakan suatu model antrean yaitu  model antrean tandem. Dengan model ini diharapkan pelayanan dapat menjadi optimal dengan beberapa tindakan misalnya menambah unit layanan agar tidak terjadi penumpukan antrean. Dari model yang dikembangkan, akan digunakan simulasi untuk mengetahui kondisi dari sistem antrean. Hasil simulasi yang diperoleh, akan dibandingkan dengan solusi analitik dari model, terkait besaran-besaran fundamental pada sistem antrean. Penerapan dari hasil analitik dan simulasi akan dilakukan di Puskesmas Dago. Dari data yang dikumpulkan akan diperoleh model antrean yang cocok pada unit-unit layanan di Puskesmas Dago
Pemberdayaan Masyarakat Perdesaan melalui Penguatan Badan Usaha Milik Desa (BUMDes) untuk Pembangunan Sosial Ekonomi Berkelanjutan: Studi Kasus Desa Mekarsari, Kabupaten Garut Pawitan, Gandhi; Lesmono, Dharma; Aritonang, Kinley; Diyanah, Mumsikah Choyri
Society Vol 13 No 1 (2025): Society
Publisher : Laboratorium Rekayasa Sosial, Jurusan Sosiologi, FISIP Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/society.v13i1.797

Abstract

Strengthening Village-Owned Enterprises (BUMDes) is crucial for reducing economic disparities in rural areas and promoting sustainable community development. While previous studies have primarily focused on financial structures and regulatory frameworks, this research adopts a participatory approach that actively engages local stakeholders in capacity-building efforts. Using BUMDes Mekarsari in Garut Regency as a case study, the study examines how participatory strengthening programs enhance the socio-economic resilience of rural communities. Employing qualitative methods—including in-depth interviews and field observations—it identifies key factors influencing BUMDes effectiveness, such as continuous training, institutional collaboration, and improved access to finance. The findings reveal that a participatory model not only fosters community engagement but also improves business sustainability and expands economic opportunities. In particular, the involvement of women and local artisans demonstrates the program’s inclusivity and potential for social transformation. Moreover, the integration of digital marketing strategies has opened new market access, further supporting rural entrepreneurship. To maximize practical impact, the study offers concrete policy recommendations, including strengthening institutional support for BUMDes, fostering multi-sector partnerships, and enhancing financial accessibility through local and national policies. These insights contribute to a more inclusive framework for rural economic empowerment, providing policymakers with a strategic foundation for designing community-driven BUMDes programs that ensure their long-term success as catalysts for local development.
Literasi Aktuaria di SMA Kristen Trimulia Bandung Jaya Permana, Ferry; Lesmono, Dharma; Sugiarto, Iwan; Kristiani, Farah; Limansyah, Taufik
SUBAKTYA: UNPAR COMMUNITY SERVICE JOURNAL Vol. 1 No. 2 (2024): (DESEMBER 2024) SUBAKTYA: UNPAR Community Service Journal
Publisher : Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26593/sucsj.v1i2.7960.16-24

Abstract

Kurikulum Merdeka yang dicanangkan oleh Pemerintah melalui Mendikbudristek pada tahun 2022 memberikan kebebasan pada sekolah dalam mengatur alokasi waktu dan materi pelajaran. Sementara itu siswa juga diberikan kebebasan memilih pelajaran yang sesuai dengan bakat dan minat, serta rencana karir yang akan dipilih. Kebebasan yang diberikan ini juga memberikan permasalahan bagi sekolah, guru dan siswa. Permasalahan tersebut antara lain terkait dengan kurangnya wawasan para siswa tentang berbagai profesi yang dapat ditekuni, lingkup pekerjaan, prospek karir, serta kaitannya dengan mata pelajaran yang harus dipilih untuk menunjang profesi tersebut. SMA Kristen Trimulia sebagai salah satu sekolah yang akan melaksanakan kurikulum Merdeka, menghadapi permasalahan yang sama. Salah satu upaya sekolah untuk mengatasi hal tersebut adalah mengundang berbagai mitra perguruan tinggi untuk memberi wawasan pada siswa tentang bidang studi yang ditawarkan. Kegiatan literasi aktuaria ini merupakan kegiatan pengabdian kepada masyarakat beberapa dosen Program Studi Sarjana Matematika UNPAR. Kegiatan ini bertujuan memperkenalkan matematika dan statistika yang terkait dengan aktuaria, sesuai dengan tingkat pengetahuan mereka sebagai siswa SMA. Melalui kegiatan ini siswa diharapkan memperoleh wawasan terkait aktuaria dan profesi aktuaris, yang dapat membantu siswa untuk memutuskan apakah profesi aktuaris merupakan pilihan karir yang cocok untuk mereka.
CALCULATION OF CREDITED INTEREST RATE WITH INVESTMENT YEAR METHOD AND PORTFOLIO METHOD Aryento, Jevilia; Kusnadi, Felivia; Lesmono, Dharma
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 16 No 3 (2022): BAREKENG: Journal of Mathematics and Its Applications
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (560.648 KB) | DOI: 10.30598/barekengvol16iss3pp787-796

Abstract

The rate of return on investment for unit-linked insurance products in Indonesia is still volatile and depends on the investment instruments performance. However, the net return on investment that is given to policyholders is projected at the beginning of the year and is used as a benchmark for choosing the right investment instrument, referred to as the credited interest rate. Interest rates movements affect the yield of the credited interest rate. Therefore, the credited interest rate calculation requires appropriate methods to reduce the risk of loss, which are the Investment Year Method and the Portfolio Method. Research shows that the Investment Year Method is more appropriate in unstable interest rate condition, whereas the Portfolio Method is better utilized in a stabilized environment. In addition, this research also shows the strategy to manage investment instruments with asset rollover to suit the fluctuating credited interest rate.
A MULTI-ITEM INVENTORY MODEL WITH VARIOUS DEMAND FUNCTIONS CONSIDERING DETERIORATION AND PARTIAL BACKLOGGING Joviani, Tania; Lesmono, Dharma; Limansyah, Taufik
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 17 No 2 (2023): BAREKENG: Journal of Mathematics and Its Applications
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol17iss2pp1069-1080

Abstract

Inventory management is an important thing to be considered in order to run the activities of a company smoothly. By considering deterioration factor, partial backlogging policy and different type of demand functions, we develop a mathematical model for multi-item inventory system. In this paper, three inventory models with constant deterioration, partial backlogging, with various demand functions are developed. We consider inventory-dependent demand, time-dependent demand and exponential demand function in each model. In addition, we also consider the replenishment policies for those three items, viz. individual replenishment, joint replenishment and combination both individual and joint replenishments. Sensitivity analysis of the models is also performed, and we found that the ordering cost greatly affects the total inventory cost when comparing the available replenishment policies.
A MATHEMATICAL MODEL WITH INVENTORY- AND SELLING PRICE-DEPENDENT DEMANDS CONSIDERING ALL-UNITS DISCOUNT AND CARBON EMISSION Pramesti, Ni Putu Dittarani; Limansyah, Taufik; Lesmono, Dharma
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 18 No 1 (2024): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol18iss1pp0129-0140

Abstract

Customer satisfaction is a crucial aspect that consistently takes center stage in business operations. In light of this, companies must devise appropriate strategies to fulfill customer demands. Consequently, this study delves into examining various factors that facilitate the supply process, including the application of discounts. Moreover, in line with the advancements in eco-green concepts, businesses have begun considering carbon emission factors concerning storage and distribution, which is further supported by the United Nations Framework Convention on Climate Change (UNFCCC). In this context, the paper presents an enhanced version of the economic order quantity model encompassing all-unit discount and carbon emission factors. The developed model entail inventory management approaches where demand relies on inventory levels, inventory levels coupled with selling prices, time-dependent demand, and exponentially declining demand patterns. The primary objective is to aid companies in optimizing their inventory management by determining the optimal quantity of goods while minimizing overall costs. Sensitivity analysis conducted to observe the influence on the reorder point (T), total inventory cost (TC), and total carbon emission (TE) reveals that lower unit purchase prices, driven by high demand, correspond to larger order quantities. Furthermore, it is worth noting that the higher average carbon emission within warehouses result in increased carbon emissions overall.
MULTI-ITEM PROBABILISTIC INVENTORY MODELS CONSIDERING DISCOUNT, EXPIRATION, WAREHOUSE CAPACITY, AND CAPITAL CONSTRAINTS Gunawan, Claresta Tirta Saputera; Lesmono, Dharma; Salim, Daniel
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 18 No 3 (2024): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol18iss3pp2001-2014

Abstract

In general, companies have inventory stored in warehouses to be used or sold in the future. To optimize inventory, companies require a model to determine the appropriate order quantity and optimal reorder timing to minimize total inventory costs. To stay within the set capacity, several factors need to be considered in inventory management, such as a product's shelf life, warehouse capacity, and capital. On the other hand, suppliers may offer discounts, and companies tend to take advantage of them. However, they must consider the warehouse capacity and capital availability. This paper constructs two probabilistic multi-item inventory models, considering discounts, expiration, warehouse capacity, and capital constraint. The first model considers all-unit discounts, while the second deals with incremental discounts. We consider three items to be managed and examine three replenishment policies, namely individual order, joint order, and a combined policy of individual and joint order, to minimize the total inventory cost. Sensitivity analysis is performed on the joint order policy to determine the influence of parameter values' changes on the reorder time and total inventory cost.
Co-Authors Adiani, Widyoretno Agus Sukmana Aryento, Jevilia Benny Yong Cherish Rikardo, Cherish Daniel Salim Diyanah, Mumsikah Choyri Erwinna Chendra Farah Kristiani Felix Arya Gunadi Ferry Jaya Permana Ferry Jaya Permana Gandhi Pawitan Gunawan, Claresta Tirta Saputera Handi Koswara Handi Koswara, Handi Iwan Sugiarto Iwan Sugiarto Joviani, Tania Kevin Kevin Kevin kevin Kinley Aritonang Krismayanti, Monika Kusnadi, Felivia Liem Chin Livia Owen Maria Anestasia Pramesti, Ni Putu Dittarani Stefanus Ivan Laksono Taufik Limansyah Widyoretno Adiani Wijaya, Andry