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Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri

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Published by Universitas Kristen Petra Surabaya

ISSN : 14112485 EISSN : 20877439 DOI : -

Core Subject : Engineering,

Industrial & Manufacturing 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.

Arjuna Subject : -

Articles 412 Documents

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Bayesian Belief Network untuk Menghasilkan Fuzzy Association Rules Rolly Intan; Oviliani Yenty Yuliana; Dwi Kristanto
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 12 No. 1 (2010): JUNE 2010
Publisher : Institute of Research and Community Outreach - Petra Christian University

Bayesian Belief Network (BBN), one of the data mining classification methods, is used in this research for mining and analyzing medical track record from a relational data table. In this paper, a mutual information concept is extended using fuzzy labels for determining the relation between two fuzzy nodes. The highest fuzzy information gain is used for mining fuzzy association rules in order to extend a BBN. Meaningful fuzzy labels can be defined for each domain data. For example, fuzzy labels of secondary disease and complication disease are defined for a disease classification. The implemented of the extended BBN in a application program gives a contribution for analyzing medical track record based on BBN graph and conditional probability tables.

Analisis Dinamik pada Model Pengendalian Persediaan Dua Produk Berbeda dengan Kapasitas Produksi Terbatas Serta Inisiatif Tim Sales Bersama Nursanti Anggriani; Eman Lesmana; Asep Supriatna; Hennie Husniah; Mochamad Yudha
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 17 No. 1 (2015): JUNE 2015
Publisher : Institute of Research and Community Outreach - Petra Christian University

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.

Kajian Termal Akibat Paparan Panas dan Perbaikan Lingkungan Kerja Listiani Nurul Huda; Kristoffel Colbert Pandiangan
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 14 No. 2 (2012): DECEMBER 2012
Publisher : Institute of Research and Community Outreach - Petra Christian University

This study aims to analyze thermal condition and improve working environment by designed ventilation systems due to improve air circulation and reduce heat exposure occurred so that workers feel more comfortable working. This study describes the thermal conditions of work and its relation to psychological aspects operator traced through thermal questionnaires. By knowing the conditions of the proposed design is further improved ventilation system. The measurement results show that the thermal average air temperature in the formulations room was 31.7 °C and wind speed of 0.27 m/s. Heat Stress Index (HSI) in the workplace about 94.41%, which indicates the great potential of the dangers of heat stress. Wet Bulb Globe Temperature (WBGT) index gained 27.64 °C so that the percentage of working time and rest time workers was 6.55 and 1.55 hours, where the percentage is not according to the standard. Productive work time workers only achieved ranged from (76.58 ± 5.91)%, where the figure is still below the standards of the company. Simulation with Computer Fluid Dynamic (CFD) software shows actual workplace conditions are very hot and poorly ventilated. By conducting some simulations improvement, then found a comfortable room conditions and air circulation smoothly. Thermal comfort is finally concluded comfortable room after Cv’s room obtained exceeds 0.34 m/s in accordance with the Macfarlane theory’s.

APLIKASI METODE NEURO-DYNAMIC PADA PROSES PENGENDALIAN PERSEDIAAN DI SEBUAH PERUSAHAAN RETAIL Ngarap Im Manik
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 10 No. 1 (2008): JUNE 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

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.

PROCUREMENT IN MANUFACTURING ORGANISATION: PORTFOLIO AND THE USE OF THE INTERNET I Nyoman Pujawan
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 5 No. 1 (2003): JUNE 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Procurement function in manufacturing organisations has played significantly more critical roles nowadays than in the past. The contribution of procurement function is much determined by how well the procurement management system is designed. A critical aspect of managing procurement function in order to optimise its contribution to the organisation is procurement portfolio, i.e., categorisation of items and then differentiation of procurement focus for different categories. This paper will discuss procurement portfolio as a basis for procurement manager to optimise the contribution of his/her function in supporting the organisation's objectives. The role of electronic procurement in each category of the portfolio will also be discussed.

A COMPARATIVE STUDY OF FORECASTING MODELS FOR TREND AND SEASONAL TIME SERIES DOES COMPLEX MODEL ALWAYS YIELD BETTER FORECAST THAN SIMPLE MODELS Suhartono Suhartono
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 7 No. 1 (2005): JUNE 2005
Publisher : Institute of Research and Community Outreach - Petra Christian University

Many business and economic time series are non-stationary time series that contain trend and seasonal variations. Seasonality is a periodic and recurrent pattern caused by factors such as weather, holidays, or repeating promotions. A stochastic trend is often accompanied with the seasonal variations and can have a significant impact on various forecasting methods. In this paper, we will investigate and compare some forecasting methods for modeling time series with both trend and seasonal patterns. These methods are Winter's, Decomposition, Time Series Regression, ARIMA and Neural Networks models. In this empirical research, we study on the effectiveness of the forecasting performance, particularly to answer whether a complex method always give a better forecast than a simpler method. We use a real data, that is airline passenger data. The result shows that the more complex model does not always yield a better result than a simpler one. Additionally, we also find the possibility to do further research especially the use of hybrid model by combining some forecasting method to get better forecast, for example combination between decomposition (as data preprocessing) and neural network model.

Pricing and Warranty Level Decisions for New and Remanufactured Short Life-Cycle Products Gan Shu San; I Nyoman Pujawan
Jurnal Teknik Industri Vol. 19 No. 1 (2017): JUNE 2017
Publisher : Institute of Research and Community Outreach - Petra Christian University

Remanufacturing has become more prominent as a recovery process to mitigate the massive disposal of short life-cycle product at its end-of-use. However, remanufactured product is often perceived to be inferior to new product, and it has lower value in consumer’s willingness to pay. To increase the perceived quality of the remanufactured product, manufacturer offers a warranty, since one of the three roles possessed in warranty is being a signal to product reliability. This paper studies the pricing decisions and warranty level decision for new and remanufactured products in a closed-loop supply chain consists of a manufacturer and a retailer. The optimization modeling is performed under Stackelberg game with manufacturer as the leader. We found that higher expansion effectiveness coefficient would increase the supply chain profit. Also, there is an interval of demand’s speed of change, where the total profit would be at its highest. The optimum warranty level can be achieved regardless the initial warranty level set at the beginning of retailer’s optimization. Furthermore, the remanufactured product’s wholesale and retail prices are influenced by the expansion effectiveness coefficient.

The Development of Manufacturing Process Analysis: Lesson Learned from Process Mining Bernardo Nugroho Yahya
Jurnal Teknik Industri Vol. 16 No. 2 (2014): DECEMBER 2014
Publisher : Institute of Research and Community Outreach - Petra Christian University

Process analysis is recognized as a major stage in business process reengineering that has developed over the last two decades. In the field of manufacturing, manufacturing process analysis (MPA) is defined as performance analysis of the production process. The performance analysis is an outline from data and knowledge into useful forms that can be broadly applied in manufacturing sectors. Process mining, an emerge tool focusing on process perspective and resource perspective, is a way to analyze system based on the event log. The objective of this study is to extend the existing process analysis framework by considering attribute perspective. This study also aims to learn the lessons from some experiences on process mining in manufacture industries. The result of this study will help manufacturing organizations to utilize the process mining approach for analyzing their respective processes.

Sequence Matching Analysis for Curriculum Development Liem Yenny Bendatu; Bernardo Nugroho Yahya
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 17 No. 1 (2015): JUNE 2015
Publisher : Institute of Research and Community Outreach - Petra Christian University

Many organizations apply information technologies to support their business processes. Using the information technologies, the actual events are recorded and utilized to conform with predefined model. Conformance checking is an approach to measure the fitness and appropriateness between process model and actual events. However, when there are multiple events with the same timestamp, the traditional approach unfit to result such measures. This study attempts to develop a sequence matching analysis. Considering conformance checking as the basis of this approach, this proposed approach utilizes the current control flow technique in process mining domain. A case study in the field of educational process has been conducted. This study also proposes a curriculum analysis framework to test the proposed approach. By considering the learning sequence of students, it results some measurements for curriculum development. Finally, the result of the proposed approach has been verified by relevant instructors for further development.

INOVASI PROSES DI SUATU INDUSTRI SANDAL Tandy Ivanno Handoyo; Kriswanto Widiawan
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 2 No. 2 (2000): DESEMBER 2000
Publisher : Institute of Research and Community Outreach - Petra Christian University

The problem which will be discussed is assembly lines in the shop floor, especially in sewing department. This department used line process system, that arised problems such as process jam, delay, wasting time of workers and too much holding materials. This research introduced process innovation, i.e. forming work-groups among workers. There are two alternative ideas which will be assessed. First, work-groups by process. Second, work-groups by complete line. After choosing the best idea, then the process was followed up with line balancing method with COMSOAL (Computer Method of Sequencing for Assembly Lines). The result showed that the second idea (complete line work groups) is better than the first one. Efficiency improvement is 29.2 % compared by the efficiency before the application of line balancing. Abstract in Bahasa Indonesia : Masalah yang akan dibahas adalah proses kerja pada lantai produksi di bagian jahit yang memberlakukan line process system. Proses ini menimbulkan kemacetan, keterlambatan, arus bolak-balik antar pekerja dan penumpukan material yang mengganggu produktivitas. Pada penelitian ini akan dilakukan inovasi proses pada sistem alur kerja dengan cara membentuk kelompok kerja. Ada dua ide alternatif kelompok kerja yang akan diuji, yaitu pengelompokan berdasarkan proses dan pengelompokan berdasarkan line utuh. Setelah terpilih ide alternatif terbaik, dilakukan keseimbangan lintasan dengan metode COMSOAL (Computer Method of Sequencing for Assembly Lines). Hasil penelitian menunjukkan ide terbaik adalah pengelompokan dengan line utuh. Setelah dilakukan keseimbangan lintasan, diperoleh peningkatan efisiensi sebesar 29,2% dibandingkan kondisi sebelum diterapkan keseimbangan lintasan. Kata kunci: inovasi proses, keseimbangan lintasan.

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