I Nyoman Sutapa
Faculty of Industrial Technology, Petra Christian University

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STUDI TENTANG TRAVELLING SALESMAN DAN VEHICLE ROUTING PROBLEM DENGAN TIME WINDOWS I Nyoman Sutapa; I Gede Agus Widyadana; Christine Christine
Jurnal Teknik Industri Vol. 5 No. 2 (2003): DECEMBER 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (194.963 KB) | DOI: 10.9744/jti.5.2.pp. 81-89

Abstract

The article shows the study of model development of travelling salesman problem. Three models are studied, i.e. travelling salesman problem with time windows, vehicle routing problem, and vehicle routing problem with time windows. Abstract in Bahasa Indonesia : Dalam artikel ini dipaparkan kajian mengenai pengembangan model travelling salesman problem. Ada tiga model yang dikaji yaitu travelling salesman problem dengan time windows, vehicle routing problem, serta vehicle routing problem dengan time windows. Kata-kunci: travelling salesman problem, vehicle routing problem, time windows.
PENGALOKASIAN ANGGARAN DENGAN MEMPERTIMBANGKAN MULTI-INPUT/OUTPUT MENGGUNAKAN DATA ENVELOPMENT ANALYSIS I Nyoman Sutapa
Jurnal Teknik Industri Vol. 3 No. 1 (2001): JUNE 2001
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (39.977 KB) | DOI: 10.9744/jti.3.1.pp. 26-34

Abstract

In this article is developed a data envelopment analysis (DEA) model to solve a budget allocation problem to the decision-making units (DMU's) in an organisation. The allocation is depend on multi-input/output. To develop the model is used some of numerical examples. The results of calculation by DEA model are an optimum budget allocation in lower and upper bound and a fix value between them Abstract in Bahasa Indonesia : Dalam artikel ini dikembangkan sebuah model data envelopment analysis (DEA) untuk memecahkan masalah pengalokasian anggaran ke masing-masing unit pengambil keputusan (UPK) dalam sebuah organisasi, yang mempertimbangkan multi-input/output. Dalam mengembangkan model, dilakukan dengan beberapa contoh numeris. Hasil perhitungan dengan model DEA ini, didapatkan alokasi anggaran optimal yang berupa batas bawah dan atas serta nilai alokasi diantara kedua nilai tersebut. Kata kunci : data envelopment analysis, efisiensi, alokasi anggaran.
PENJADWALAN JOBS PADA SINGLE MACHINE DENGAN MEMINIMUMKAN VARIANS WAKTU PENYELESAIAN JOBS Studi Kasus di P.T. XYZ I Gede Agus Widyadana; Fenny Nilawati Kusuma; I Nyoman Sutapa
Jurnal Teknik Industri Vol. 3 No. 1 (2001): JUNE 2001
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (43.355 KB) | DOI: 10.9744/jti.3.1.pp. 35-42

Abstract

This paper discusses a jobs scheduling on a single machine to minimize variance of job completion time. The objective is especially important in situations where it is desirable to provide customers or jobs with approximately the same treatment. In this case, data are collected from P.T. 'XYZ'. The focus of discussion is LB/KB Departement (Leather Board/Carton Board) with carton board's production line, which produces carton board. Carton board's size is 150 x 110 cm and its thickness from 0,6 mm to 2,5 mm. In this paper a comparison analysis, the deviation of the objective value given by a heuristic (Vh) method from the objective value given by P.T. 'XYZ' (Vp), is made. The percentage of deviation Vh from Vp is 50,36 %, which shows that the performance of heuristic is better, that is variance of job completion time by heuristic method smaller than by P.T. 'XYZ'. Besides the above discussion, the weakness dan superiority of heuristic are analyzed too. Abstract in Bahasa Indonesia : Makalah ini membahas penjadwalan jobs pada single machine dengan tujuan meminimumkan varians waktu penyelesaian job, yaitu untuk memberikan konsumen atau jobs kurang lebih perlakuan yang sama. Data yang diambil dalam pembahasan ini berasal dari perusahaan P.T. 'XYZ', di mana departemen yang menjadi fokus pembahasan adalah Departemen LB/KB (Leather Board/Karton Board) dengan lintasan produksi karton board yang menghasilkan produk carton board ukuran 150 x 110 cm, dengan ketebalan 0,6 mm sampai dengan 2,5 mm. Dalam makalah ini dilakukan analisis perbandingan jadwal jobs pada proses produksi di perusahaan yang telah ada dengan jadwal jobs menggunakan metode heuristic, yaitu menggunakan persentase penyimpangan Vh (varians waktu penyelesaian jobs metode heuristic) dari Vp (varians waktu penyelesaian jobs perusahaan). Dari hasil analisis didapatkan bahwa persentase penyimpangan Vh dari Vp sebesar 50,36%, hal ini menunjukkan bahwa performance metode heuristic lebih baik, yaitu varians waktu penyelesaian jobs-nya lebih kecil daripada metode perusahaan. Selain itu, dalam makalah juga dianalisis kelemahan dan keunggulan metode heuristic yang digunakan dalam penjadwalan pada single machine. Kata kunci : penjadwalan single-machine, varians waktu penyelesaian, prosedur heuristic.
APLIKASI FUZZY ANALYTICAL HIERARCHY PROCESS DALAM SELEKSI KARYAWAN Jani Rahardjo; I Nyoman Sutapa
Jurnal Teknik Industri Vol. 4 No. 2 (2002): DECEMBER 2002
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (93.238 KB) | DOI: 10.9744/jti.4.2.pp. 82-92

Abstract

The paper discusses the decision making problem for worker selection. To solved this problem is applied the Fuzzy Analytical Hierarchy Process, development of the ordinary Analytical Hierarchy Process which created to handle the subjectivity of multi-criteria. The best choice by Fuzzy Analytical Hierarchy Process showed that subjectivities criteria have been included comparing by the ordinary Analytical Hierarchy Process. Abstract in Bahasa Indonesia : Makalah ini membahas mengenai masalah pengambilan keputusan untuk memilih alternatif karyawan terbaik. Untuk memecahkan masalah ini digunakan Fuzzy Analytical Hierarchy Process, pengembangan Analytical Hierarchy Process konvensional yang dirancang untuk menangani permasalahan yang kriteria-kriterianya lebih banyak bersifat subjektif. Pilihan karyawan terbaik dengan Fuzzy Analytical Hierarchy Process menunjukkan bahwa subjektifitas kriteria sangat diperhatikan dibandingkan dengan menggunakan Analytical Hierarchy Process konvensional. Kata kunci: Analytical Hierarchy Process, Fuzzy Analytical Hierarchy Process.
CASE STUDIES OF USE OF DESIGN OF EXPERIMENTS IN MATERIAL RESEARCH Salil Kumar Roy; I Nyoman Sutapa
Jurnal Teknik Industri Vol. 5 No. 1 (2003): JUNE 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (288.781 KB) | DOI: 10.9744/jti.5.1.pp. 32-40

Abstract

The paper describes principles of factorial and fractional factorial design of experiments. The various ways of analysing data obtained by these procedures are shown via four case studies. Yates method was followed in case 1 where the effect of anode type, carbon content of steel, temperature, and agitation on cathodic protection of steel in seawater, on current density, was studied. In case 2, a glass was formulated within 10 constituante melted, quantity water and tested for flow caracteristics, from the result the factor effect was calculated. In case 3, analysis of results is done in a very simple way. In this case, the effect of carbon content, surface condition, temperature, and agitation on the corrosion of steel in seawater was studied. In case 4, the effect of eleven constituents on acid resistance of a cast iron enamel has been studied through sixteen experimental compositions. This case gives a method to find out which of the sixteen experimental compositions is nearest to a target value.
FUZZY INFERENCE SYSTEM MODELING FOR BED ACTIVE CARBON RE-GENERATION PROCESS (CO2 GAS FACTORY CASE) S. Febriana; M.D. Kurniawati; Iwan Halim Sahputra; I Nyoman Sutapa
Jurnal Teknik Industri Vol. 7 No. 2 (2005): DECEMBER 2005
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (217.845 KB) | DOI: 10.9744/jti.7.2.pp. 119-126

Abstract

Bed active carbon is one of the most important materials that had great impact in determining level of impurities in production of CO2 gas. In this particular factory case, there is unavailability of standard duration time of heating and cooling and steam flow rate for the re-generation process of bed active carbon. The paper discusses the fuzzy inference system for modeling of re-generation process of bed active carbon to find the optimum setting parameter. The fuzzy inference system was build using real historical daily processing data. After validation process, surface plot analysis was performed to find the optimum setting. The result of re-generation parameter setting is 9-10 hours of heating process, 4.66-5.32 hours of cooling process, and 1500-2500 kg/hr of steam flow rate.