Articles
<![CDATA[Potensi Kebijaksanaan Kontrak Pemeliharaan Mesin dalam Menunjang Keberhasilan Mekanisme Industri Pertanian ]]>
<![CDATA[Husniah, Hennie]]>;
<![CDATA[S. Pasaribu, Udjiana]]>;
<![CDATA[Halim, A.H.]]>;
<![CDATA[Iskandar, B.P.]]>
<![CDATA[ Jurnal Teknik Industri Vol 18, No 1 (2016): JUNE 2016 ]]>
Publisher : <![CDATA[Institute of Research and Community Outreach - Petra Christian University ]]>
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DOI: 10.9744/jti.18.1.21-30
<![CDATA[In this paper we discuss a mathematical model of maintenance policy for certain type of agricultural equipments. It is assumed that the equipments are repairable and sold with two-dimensional warranty, i.e. a warranty with two scales of limit, such as the age of the equipment and the usage of the equipment. As an example in the case of automobile, the warranty is cease whenever the age of the automobile reaches 5 years or its mileage reaches 50.000 km, whichever occurs first. The model is intended to provide the best contract-based preventive maintenance (PM) strategy chosen from available options. A method to determine the optimal cost of service contract, both from user and producer view points, is presented. Numerical simulations reveal that the resulting optimal strategy depends on the level of the consumer usage pattern. In this paper we show that the selection of optimal policy is potential in supporting the performance of mechanization in agricultural industry in terms of choosing the best strategy to maintain agricultural equipments effectively (is able to reduce the failure rate of the equipment) with a minimal cost.]]>
<![CDATA[Analisis Dinamik pada Model Pengendalian Persediaan Dua Produk Berbeda dengan Kapasitas Produksi Terbatas Serta Inisiatif Tim Sales Bersama ]]>
<![CDATA[Anggriani, Nursanti]]>;
<![CDATA[Lesmana, Eman]]>;
<![CDATA[Supriatna, Asep]]>;
<![CDATA[Husniah, Hennie]]>;
<![CDATA[Yudha, Mochamad]]>
<![CDATA[ Jurnal Teknik Industri Vol 17, No 1 (2015): JUNE 2015 ]]>
Publisher : <![CDATA[Institute of Research and Community Outreach - Petra Christian University ]]>
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DOI: 10.9744/jti.17.1.17-26
<![CDATA[In this paper we discuss a mathematical model of inventory control policy based on local stability analysis using a system dynamics approach. It is assumed that the production capacity and the maximum production capacity has an upper limit but with sufficient availability of raw materials so that the production occurs continuously without stock out. The model is intended to meet the market equilibrium by determining the optimal number of agents in a team of salesman, the level of inventory, and the level of production capacity, so that thenet income is maximized. We use the Pontryagin Maximum Principle to find the optimal control of the system. Finally some numerical simulations are performed to give a sensitivity analysis of the inventory control policy to the parameters involved in the system.]]>
<![CDATA[A DYNAMICAL SYSTEM APPROACH IN MODELING TECHNOLOGY TRANSFER ]]>
<![CDATA[Husniah, Hennie]]>;
<![CDATA[Sebrina, Sebrina]]>;
<![CDATA[Supriatna, A. K.]]>
<![CDATA[ Journal of the Indonesian Mathematical Society Volume 22 Number 1 (April 2016) ]]>
Publisher : <![CDATA[IndoMS ]]>
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DOI: 10.22342/jims.22.1.212.37-59
<![CDATA[In this paper we discuss a mathematical model of two parties technology transfer from a leader to a follower. The model is reconstructed via dynamical system approach from a known standard Raz and Assa model and we found some important conclusion which have not been discussed in the original model. The model assumes that in the absence of technology transfer from a leader to a follower, both the leader and the follower have a capability to grow independently with a known upper limit of the development. We obtain a rich mathematical structure of the steady state solution of the model. We discuss a special situation in which the upper limit of the technological development of the follower is higher than that of the leader, but the leader has started earlier than the follower in implementing the technology. In this case we show a paradox stating that the follower is unable to reach its original upper limit of the technological development could appear whenever the transfer rate is sufficiently high. Â We propose a new model to increase realism so that any technological transfer rate could only has a positive effect in accelerating the rate of growth of the follower in reaching its original upper limit of the development.DOI :Â http://dx.doi.org/10.22342/jims.22.1.212.37-59]]>
<![CDATA[Cost analysis of warranty based on lemon law with multiple failures and total downtime ]]>
<![CDATA[Husniah, Hennie]]>;
<![CDATA[K. Hermawan, K. Hermawan]]>;
<![CDATA[B.P. Iskandar, B.P. Iskandar]]>
<![CDATA[ INOVASI Vol 17, No 1 (2021) ]]>
Publisher : <![CDATA[Faculty of Economics and Business Mulawarman University ]]>
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DOI: 10.29264/jinv.v17i1.9214
<![CDATA[Analysis of warranty costs is a topic that is widely studied in various finished product industries. One type of warranty that applies is a product warranty under Lemon Law. This guarantee under Lemon Law applies a lot to automotive products such as cars. Lemon Law is a law that protects consumers from poor quality new goods that are not in accordance with related product standards but can reach consumers. With this Lemon Law, consumers can return products that are proven to have a lemon condition in the hands of producers to then get a refund (replacement ) or replacement with a new similar product ( replacement ). The product can be claimed in a lemon condition if: (1) the car has been returned to the dealer four times because it needs to be repaired on the same problem / faulty part, but the dealer is unable to fix it satisfactorily; or (2) the car has been out of service for more than 30 days due to one or more damage. Analysis of warranty costs in this study includes replacement cases with compliance with conditions (1) only, replacement cases with fulfillment of conditions (2) only, and replacement cases with fulfillment of conditions (1) and conditions (2). A simulation method is designed to illustrate variations in the condition of the damage to the car during the warranty period as well as variations in repair time when damage occurs based on a particular distribution. The algorithm of the simulation is then modified and developed to determine the expected cost that fulfill the conditions (1) and (2).]]>
<![CDATA[ANALISIS PEREMAJAAN ANGKUTAN KOTA Studi Kasus : Angkot Trayek Margahayu Raya – Ledeng ]]>
<![CDATA[Hennie Husniah]]>;
<![CDATA[Asep K. Supriatna]]>
<![CDATA[ Sosiohumaniora Vol 5, No 2 (2003): SOSIOHUMANIORA, JULI 2003 ]]>
Publisher : <![CDATA[Universitas Padjadjaran ]]>
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DOI: 10.24198/sosiohumaniora.v5i2.5296
<![CDATA[Dalam paper ini dibahas suatu model matematika untuk peremajaan angkutan kota. Model yang dibentuk berupa model yang kontinu. Model kemudian diaplikasikan untuk menentukan umur ekonomis angkutan kota trayek Margahayu Raya – Ledeng di Bandung, dalam kaitannya dengan peremajaan angkutan kota yang bersangkutan. Lebih jauh lagi umur ekonomis yang diperoleh ini kemudian dibandingkan dengan berbagai skenario, seperti tingkat suku bunga yang berbeda, tingkat utilitas yang berbeda dan harga bahan bakar minyak yang berbeda. Kata kunci : Umur Ekonomis, Peremajaan Angkutan Kota]]>
<![CDATA[Model Dinamis Persediaan Tiga Produk dengan Penjualan Bersama ]]>
<![CDATA[Hennie Husniah]]>;
<![CDATA[Asep K. Supriatna]]>
<![CDATA[ Journal Industrial Servicess Vol 1, No 1 (2015): Oktober 2015 ]]>
Publisher : <![CDATA[Fakultas Teknik Jurusan Teknik Industri Universitas Sultan Ageng Tirtayasa ]]>
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DOI: 10.36055/jiss.v1i1.286
<![CDATA[Dalam makalah ini dibahas mengenai model sistem dinamik dari tingkat persediaan tiga jenis produk yang dijual secara bersamaan oleh sebuah tim pemasaran. Laju penjualan diasumsikan merupakan fungsi yang dipengaruhi oleh jumlah anggota tim pemasaran ini. Ketiga produk diasumsikan diproduksi dengan tingkat pertumbuhan produksi logistik (Verhulst) yang dimodifikasi, sehingga dapat mengakomodir berbagai bentuk pertumbuhan, seperti pertumbuhan hampir linier sampai dengan pertumbuhan sigmoid. Tingkat persediaan jangka panjang (steady state/long-term inventory level) untuk masing-masing produk dicari dan kestabilannya diperlihatkan untuk syarat tertentu. Kemudian juga beberapa contoh numerik diberikan sebagai ilustrasi dari sifat solusi sistem dinamis yang terbentuk.]]>
<![CDATA[PARAMETER DETERMINATION INMANUFACTURING PROGRESS CURVE WITH THREE POINTS OF DATA ]]>
<![CDATA[Hennie Husniah]]>;
<![CDATA[Asep K. Supriatna]]>
<![CDATA[ STATISTIKA: Forum Teori dan Aplikasi Statistika Vol 4, No 2 (2004) ]]>
Publisher : <![CDATA[Program Studi Statistika Unisba ]]>
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DOI: 10.29313/jstat.v4i2.883
<![CDATA[In this paper we discus a method to find the values of parameters in a manufacturing progress curve based on three pointsof data. In general to find better parameter estimation we need a lot of data. However, in some circumstances, the numbersof data are limited or even scarce, especially in the beginning of a manufacturing process. For this reason, we develop asimple method to determine the values of parameters if only three data are available. The curve we are dealing with is aninverse-like sigmoid that can describe a learning process in the beginning phase and has a lower bound in the long-termphase, hence a reasonably realistic curve.]]>
<![CDATA[A DYNAMICAL SYSTEM APPROACH IN MODELING TECHNOLOGY TRANSFER ]]>
<![CDATA[Hennie Husniah]]>;
<![CDATA[Sebrina Sebrina]]>;
<![CDATA[A. K. Supriatna]]>
<![CDATA[ Journal of the Indonesian Mathematical Society Volume 22 Number 1 (April 2016) ]]>
Publisher : <![CDATA[IndoMS ]]>
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DOI: 10.22342/jims.22.1.212.37-59
<![CDATA[In this paper we discuss a mathematical model of two parties technology transfer from a leader to a follower. The model is reconstructed via dynamical system approach from a known standard Raz and Assa model and we found some important conclusion which have not been discussed in the original model. The model assumes that in the absence of technology transfer from a leader to a follower, both the leader and the follower have a capability to grow independently with a known upper limit of the development. We obtain a rich mathematical structure of the steady state solution of the model. We discuss a special situation in which the upper limit of the technological development of the follower is higher than that of the leader, but the leader has started earlier than the follower in implementing the technology. In this case we show a paradox stating that the follower is unable to reach its original upper limit of the technological development could appear whenever the transfer rate is sufficiently high. We propose a new model to increase realism so that any technological transfer rate could only has a positive effect in accelerating the rate of growth of the follower in reaching its original upper limit of the development.DOI : http://dx.doi.org/10.22342/jims.22.1.212.37-59]]>
<![CDATA[Maintenance Contract With Imperfect Preventive Maintenance ]]>
<![CDATA[Hennie Husniah]]>;
<![CDATA[B P Iskandar]]>
<![CDATA[ Performa: Media Ilmiah Teknik Industri Vol 14, No 1 (2015): PERFORMA Vol. 14 No 1, Maret 2015 ]]>
Publisher : <![CDATA[Industrial Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret ]]>
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DOI: 10.20961/performa.14.1.11014
<![CDATA[In this paper, we study performance based maintenance contracts for heavy equipment operated in a mining industry. A performance based service contract uses an attractive incentives to motivate the agent to increase the maintenance effort such that the resulting equipment’s performance is well above the target. This will in turn give benefits for both the owner of the trucks and the Agent of service contract. In this paper, we study performance based maintenance service contracts for the equipment sold with warranty and the perfomances considered includes availability and safety measures. We find the optimal strategy (i.e. price of each contract and maintenance effort) for the agent and the optimal option for the owner using a non-cooperative game formulation]]>
<![CDATA[Analisis Dinamik pada Model Pengendalian Persediaan Dua Produk Berbeda dengan Kapasitas Produksi Terbatas Serta Inisiatif Tim Sales Bersama ]]>
<![CDATA[Nursanti Anggriani]]>;
<![CDATA[Eman Lesmana]]>;
<![CDATA[Asep Supriatna]]>;
<![CDATA[Hennie Husniah]]>;
<![CDATA[Mochamad Yudha]]>
<![CDATA[ Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 17 No. 1 (2015): JUNE 2015 ]]>
Publisher : <![CDATA[Institute of Research and Community Outreach - Petra Christian University ]]>
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DOI: 10.9744/jti.17.1.17-26
<![CDATA[In this paper we discuss a mathematical model of inventory control policy based on local stability analysis using a system dynamics approach. It is assumed that the production capacity and the maximum production capacity has an upper limit but with sufficient availability of raw materials so that the production occurs continuously without stock out. The model is intended to meet the market equilibrium by determining the optimal number of agents in a team of salesman, the level of inventory, and the level of production capacity, so that thenet income is maximized. We use the Pontryagin Maximum Principle to find the optimal control of the system. Finally some numerical simulations are performed to give a sensitivity analysis of the inventory control policy to the parameters involved in the system.]]>
