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Jurnal Teknik Industri
ISSN : 14112485     EISSN : 20877439     DOI : -
Core Subject : Engineering,
Jurnal Teknik Industri aims to: Promote a comprehensive approach to the application of industrial engineering in industries as well as incorporating viewpoints of different disciplines in industrial engineering. Strengthen academic exchange with other institutions. Encourage scientist, practicing engineers, and others to conduct research and other similar activities.
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Articles 8 Documents
Search results for , issue "Vol. 10 No. 1 (2008): JUNE 2008" : 8 Documents clear
APLIKASI KOMBINASI ALGORITMA GENETIK DAN DATA ENVELOPMENT ANALYSIS PADA PENJADWALAN FLOWSHOP MULTIKRITERIA Herry Christian Palit; Haris Lienardo; I Gede Agus Widyadana
Jurnal Teknik Industri Vol. 10 No. 1 (2008): JUNE 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (120.63 KB) | DOI: 10.9744/jti.10.1.pp. 86-96

Abstract

This article discusses the combination of genetic algorithm (GA) and Data Envelopment Analysis (DEA) to solve the flowshop scheduling problems with multicriteria. The criteria are makespan, total weighted tardiness, and mean flow time. DEA is used to calculate the overall value of criteria from each sequence. Relative efficiency value is employed as the fitted value in genetic algorithm, in order to have overall value that independent to a particular weight. The proposed algorithm that combines GA and DEA attain optimal solutions with relative efficiency as good as analytical solution, i.e., Mixed Integer Programming (MIP). From 30 problems generated, only one problem (3,33%) has relative efficienly less than 1. Abstract in Bahasa Indonesia: Artikel ini membahas kombinasi algoritma genetik dengan Data Envelopment Analysis (DEA) untuk pemecahan masalah penjadwalan flowshop multikriteria. Kriteria-kriteria yang digunakan, yaitu makespan, total weighted tardiness, dan mean flow time. DEA digunakan untuk menghitung nilai keseluruhan kriteria dari setiap sequence dengan menggunakan nilai efisiensi relatif sebagai fitted value dalam algoritma genetik. Hal ini ditujukan agar nilai keseluruhan dari kriteria-kriteria yang ada tidak terikat pada satu jenis bobot saja. Kombinasi dua metode ini menghasilkan suatu algoritma yang mampu menghasilkan kumpulan solusi optimal dengan nilai efisiensi relatif yang tidak kalah jika dibandingkan dengan hasil dari model Mixed Integer Programming (MIP), dimana dari 30 masalah yang dibangkitkan, hanya ada 1 masalah (3,33%) yang memiliki efisiensi relatif di bawah 1. Kata kunci: penjadwalan flowshop, algoritma genetik, Data Envelopment Analysis.
MODEL PENJADWALAN BATCH PADA SATU MESIN YANG MENGALAMI DETERIORASI UNTUK MINIMASI TOTAL BIAYA SIMPAN DAN BIAYA KUALITAS Ahmad S. Indrapriyatna; Suprayogi Suprayogi; Bermawi P. Iskandar; A. Hakim Halim
Jurnal Teknik Industri Vol. 10 No. 1 (2008): JUNE 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (209.043 KB) | DOI: 10.9744/jti.10.1.pp. 26-37

Abstract

This research discusses batch scheduling model accommodating the condition of machine deterioration. The proposed model has changed the formulation of quality cost from that discussed in Indrapriyatna et al. (2007a), especially in the internal and external failure costs. It is assumed that the distribution of time between out-of-control conditions follows the exponential distribution. An algorithm has been proposed. This research concludes that, for continue batch size, the greater the sample size proportion of the batch size, the greater the total cost and number of batches. In addition, the greater the probability of producing nonconforming products, the greater the total cost. For any values of the probability, the number of batches will be the same, but the batch sizes are different. On the other hand, for model with discrete batch sizes, we used Indrapriyatna et al. (2007b) approach to solve the problem. Abstract in Bahasa Indonesia: Penelitian ini membahas model penjadwalan batch yang mengakomodasikan kondisi mesin terdeteriorasi, yang akan menyebabkan produk menjadi nonconforming. Pengembangan ini mengubah formulasi biaya kualitas yang telah dirumuskan pada model Indrapriyatna et al. (2007a), khususnya untuk Biaya Kegagalan Internal dan Biaya Kegagalan Eksternal. Dalam model usulan, waktu antar kondisi out-of-control diasumsikan berdistribusi eksponensial. Sebuah algoritma penyelesaian dirancang untuk model usulan tersebut. Studi ini menunjukkan bahwa, untuk model dengan ukuran batch kontinu, semakin besar proporsi ukuran sampel menyebabkan biaya total dan jumlah batch yang semakin besar. Selain itu, semakin besar peluang produk nonconforming dihasilkan maka akan menyebabkan semakin besar total biaya. Observasi lain menunjukkan bahwa jumlah batch selalu sama untuk sebarang nilai peluang; walaupun ukuran masing-masing batch berbeda. Pada model dengan ukuran batch diskrit digunakan 3 buah metode untuk mengubah ukuran batch menjadi integer yang diusulkan oleh Indrapriyatna et al. (2007b) dan menghasilkan kesimpulan yang sama. Kata kunci: mesin terdeteriorasi, produk nonconforming, ukuran batch kontinu, ukuran batch diskrit.
MODEL PERENCANAAN PRODUKSI PADA RANTAI PASOK CRUDE PALM OIL DENGAN MEMPERTIMBANGKAN PREFERENSI PENGAMBIL KEPUTUSAN Rika Ampuh Hadiguna; Machfud Machfud
Jurnal Teknik Industri Vol. 10 No. 1 (2008): JUNE 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (172.084 KB) | DOI: 10.9744/jti.10.1.pp. 38-49

Abstract

A model of production planning in Crude Palm Oil industry is discussed on this paper. An interactive model is made due to the involvement of decision maker’s preference in production planning. The model is built for Nucleus-Plasma palm estate system. The sources of fresh palm fruit bunches are obtained from nucleus estate, plasma estate and outsourcing. A single objective fuzzy linear programming model is built with the following steps: (1) Decision variables, parameters are identified from the real system of Crude Palm Oil industry as well as determination of constraints and objective function; (2) Fuzzy parameters are determined using modified S curve membership function. Linear programming model is also formulated at this step. Risk quality of raw material is represented by percentage of defect raw material; (3) Model is then validated using data from Nucleus-Plasma palm estate system. The result shows that S curve membership function is able to represent the preference of decision makers. Abstract in Bahasa Indonesia: Tulisan ini membahas sebuah model perencanaan produksi dalam kerangka rantai pasok agroindustri crude palm oil (minyak sawit mentah). Model dibuat interaktif karena melibatkan preferensi pengambil keputusan dalam perencanaan produksi. Model dibangun pada lingkup perkebunan yang menggunakan sistem Perkebunan Inti Rakyat (PIR). Sumber pasokan tandan buah segar berasal dari kebun inti, kebun petani plasma, dan kebun luar. Konsep pemodelan yang diterapkan adalah programa linear fuzzy dengan obyektif tunggal. Model dikembangkan dalam beberapa tahapan. Pertama, mengidentifikasi variabel, parameter, kendala dan fungsi obyektif. Kedua, menetapkan parameter fuzzy dengan fungsi keanggotaan berbentuk kurva S dimodifikasi. Pada tahap ini dilakukan formulasi model dalam bentuk programa linear. Resiko kualitas yang berasal dari bahan baku direpresentasikan dalam bentuk persen jumlah cacat. Ketiga, melakukan pengujian model menggunakan data yang diadopsi dari sebuah perusahaan perkebunan yang mempunyai sistem PIR. Hasil yang diperoleh menunjukkan bahwa model mempunyai kemampuan untuk mengakomodir preferensi pengambil keputusan. Kata kunci: rantai pasok, agroindustri, programa linear, fuzzy, kualitas, preferensi.
KEUNGGULAN KOMPETITIF INDUSTRI KECIL DI KLASTER INDUSTRI KECIL TRADISIONAL DENGAN PENDEKATAN BERBASIS SUMBER DAYA: STUDI KASUS PENGUSAHA INDUSTRI KECIL LOGAM KIARA CONDONG, BANDUNG Widjajani Widjajani; Gatot Yudoko
Jurnal Teknik Industri Vol. 10 No. 1 (2008): JUNE 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (370.857 KB) | DOI: 10.9744/jti.10.1.pp. 50-64

Abstract

Small-scale industries play an important role in the betterment of society. Industrial cluster approach has been used by government as an alternative government policy to increase competitiveness of small-scale industries in Indonesia. An industry cluster consists of core enterprise(s) and related enterprises in which the core acts as a pulling agent for the other counterparts. Therefore, developing the core enterprises is expected to increase competitiveness of the whole cluster. This research is a strategy process research, aiming at identifying and modeling strategic behavior of a successful entrepreneur in a metal-making cluster industry at Kiara Condong Bandung, West Java. Based on the literature review, qualitative research methodology is used in this research by combining soft systems methodology (SSM) and grounded theory. The major findings of this research indicate four kinds of strategic behavior models, namely behavior model of strategy setting, behavior model of production operations, behavior model of research and development and innovation and behavior model of marketing operations. Abstract in Bahasa Indonesia: Industri kecil mempunyai peranan penting dalam meningkatkan kesejahteraan masyarakat. Pendekatan klaster industri dicanangkan oleh pemerintah sebagai alternatif kebijakan pemerintah untuk membangun keunggulan kompetitif di industri kecil. Di suatu klaster industri kecil yang terdiri dari unit usaha inti dan unit usaha penunjang, unit usaha inti merupakan gerbong penghela klaster. Oleh karena itu mengembangkan usaha inti sehingga mempunyai keunggulan kompetitif diharapkan dapat mengembangkan klaster secara keseluruhan. Penelitian ini merupakan penelitian proses strategi (strategy process research) yang meneliti perilaku strategis manajer pemilik industri kecil dalam mengelola usahanya untuk membangun keunggulan kompetitif dengan pendekatan berbasis sumber daya (Resource-Based View atau RBV) dan mengambil studi kasus pengusaha industri kecil yang berhasil di klaster Industri Kecil Tradisional Logam Kiara Condong. Paradigma penelitian yang digunakan adalah interpretatif-induktif-kualitatif dengan penggabungan antara soft systems methodology (SSM) dan grounded theory. Hasil dari penelitian ini berupa model konseptual yang menggambarkan proses Industri Kecil Logam di Industri Kecil Tradisional Logam Kiara Condong dalam membangun keunggulan kompetitifnya. Perilaku strategis yang ditemukan pada penelitian ini terdiri dari empat model, yaitu model perilaku penentuan strategi, model perilaku pelaksanaan produksi, model perilaku pelaksanaan litbang dan inovasi, serta model perilaku pelaksanaan pemasaran. Kata kunci:industri kecil, keunggulan kompetitif, perilaku strategis, resource based view (RBV), soft systems methodology (SSM), grounded theory.
EFFECT OF COST INCREMENT DISTRIBUTION PATTERNS ON THE PERFORMANCE OF JIT SUPPLY CHAIN Ayu Bidiawati J.R; Noor Ajian Mohd Lair
Jurnal Teknik Industri Vol. 10 No. 1 (2008): JUNE 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (84.833 KB) | DOI: 10.9744/jti.10.1.pp. 65-73

Abstract

Cost is an important consideration in supply chain (SC) optimisation. This is due to emphasis placed on cost reduction in order to optimise profit. Some researchers use cost as one of their performance measures and others propose ways of accurately calculating cost. As product moves across SC, the product cost also increases. This paper studied the effect of cost increment distribution patterns on the performance of a JIT Supply Chain. In particular, it is necessary to know if inventory allocation across SC needs to be modified to accommodate different cost increment distribution patterns. It was found that funnel is still the best card distribution pattern for JIT-SC regardless the cost increment distribution patterns used.
A SMOOTH DIFFUSION RATE MODEL OF WOOD DRYING:A SIMULATION TOWARD MORE EFFICIENT PROCESS IN INDUSTRY Edi Cahyono; Yudi Soeharyadi; Mukhsar Mukhsar
Jurnal Teknik Industri Vol. 10 No. 1 (2008): JUNE 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (887.443 KB) | DOI: 10.9744/jti.10.1.pp. 1-10

Abstract

In this paper we consider modeling of wood drying process in an industry. The process is conducted in a kiln oven. Mathematically, the drying inside the wood is considered as an initial and boundary value problem. The model is a diffusion equation where the diffusion rate depends on the moisture content of the wood. We investigate a smooth diffusion rate and we compare the model with real data from an industry. The model shows a good agreement with the real data. Moreover, the model shows a smoother process of drying, which is more desirable by the timber and lumber industries to improve their current methods of drying.
MODEL SIMULTAN DAN DECOUPLED UNTUK PENYELESAIAN PROBLEM INTEGRASI PRODUKSI-PERSEDIAAN-DISTRIBUSI-PERSEDIAAN Annisa Kesy Garside
Jurnal Teknik Industri Vol. 10 No. 1 (2008): JUNE 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (421.359 KB) | DOI: 10.9744/jti.10.1.pp. 11-25

Abstract

The necessity to cut costs and inventory along supply chain makes a more integrated decision between production and distribution functions becomes very important. The purpose of this research is to develop a simultaneous and decoupled optimization model to solve integrated production-inventory-distribution-inventory problem. The model is formulated as Mixed Integer Programming (MIP) with objective function minimizing total cost which covers fixed and variable production cost, plant and Distribution Center (DC) inventory cost, regular and overtime delivery cost. As the conclusion of the two models used to solve integrated production-inventory-distribution-inventory problem, the total cost of simultan model is smaller than the decoupled one. Abstract in Bahasa Indonesia: Tuntutan untuk mengurangi biaya-biaya dan persediaan sepanjang supply chain, menyebabkan pengambilan keputusan yang lebih terintegrasi diantara fungsi produksi dan distribusi menjadi sangat penting. Penelitian ini bertujuan untuk mengembangkan model simultan dan decoupled untuk menyelesaikan problem integrasi produksi-persediaan-distribusi-persediaan. Model simultan dan decoupled diformulasikan sebagai Mixed Integer Programming (MIP) dengan fungsi tujuan meminimalkan total biaya yang meliputi biaya produksi tetap dan variabel, biaya persediaan di pabrik dan Distribution Center (DC) serta biaya pengiriman secara reguler dan overtime. Dengan menggunakan kedua model untuk menyelesaikan problem integrasi produksi-persediaan-distribusi-persediaan, diperoleh total biaya model simultan lebih kecil dibanding model decoupled. Kata kunci: koordinasi supply chain, integrasi produksi-persediaan-distribusi-persediaan, mixed integer programming, pengiriman langsung, pendekatan decoupled.
APLIKASI METODE NEURO-DYNAMIC PADA PROSES PENGENDALIAN PERSEDIAAN DI SEBUAH PERUSAHAAN RETAIL Ngarap Im Manik
Jurnal Teknik Industri Vol. 10 No. 1 (2008): JUNE 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (196.286 KB) | DOI: 10.9744/jti.10.1.pp. 74-85

Abstract

Improper inventory system in terms of cost and customer satisfaction is always the most common problem in every part of industries, and of course, also for retailers. The inappropriateness in setting of orders makes the warehouse overloaded for some kind of goods and lack for the others. To overcome this problem, we proposed to apply the Neuro-Dynamic method for optimizing the composition of goods. This method can be easily implemented using computer program and the result indicates that the overdemand and oversupply problems in that company are solved. Abstract in Bahasa Indonesia: Masalah yang sering dihadapi perusahaan retail saat ini antara lain adalah sistem pengendalian persediaan yang kurang tepat, terutama ditinjau dari segi biaya dan kepuasan pelanggan. Hal ini disebabkan karena kuantitas pemesanan yang ditetapkan perusahaan terlalu besar maupun terlalu kecil, sehingga mengakibatkan barang yang disimpan tidak optimal. Untuk menyelesaikan masalah di atas diusulkan dengan menggunakan metode Neuro-Dynamic, yang dapat mengoptimalkan stok barang yang tersedia pada toko, agar biaya yang dikeluarkan minimal dengan menghasilkan keuntungan yang sebesar-besarnya. Untuk memudahkan proses perhitungannya dilakukan dengan program komputer. Hasil pembahasan menunjukkan bahwa perusahaan retail tersebut telah terbantu dalam menjalankan aktivitas perdagangannya, karena tersedianya informasi yang dibutuhkan secara cepat dan cukup akurat dan dapat mengoptimalkan jumlah stok barang yang ada, sehingga mengoptimalkan overdemand dan oversupply. Kata kunci: pengendalian persediaan, Neuro-Dynamic, optimasi.

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