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All Journal Jurnal Manajemen dan Organisasi IPTEK Journal of Proceedings Series JAM : Jurnal Aplikasi Manajemen Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Civil Engineering Journal Indonesian Journal of Information System Jurnal Ilmiah Teknik Industri Indonesian Journal of Innovation Studies Jurnal Locus Penelitian dan Pengabdian Sewagati

I Nyoman Pujawan

Department Of Industrial And System Engineering, Institut Teknologi Sepuluh Nopember, Surabaya

Author-ID : 348256

Aerospace Engineering Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Public Health Social Sciences Transportation Other

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Simulation of In Bag Fertilizer Loading Process In Port of Petrokimia Gresik to Increase Loading Rate Wahyudi Putra, Bagusranu; Pujawan, I Nyoman
IPTEK Journal of Proceedings Series No 3 (2020): International Conference on Management of Technology, Innovation, and Project (MOTIP) 2
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2020i3.11080

Pelabuhan Petrokimia Gresik is one of the element to support the goverment regarding to maintain stability of fertilizer loading speed. The issue that occurs at Pelabuhan Petrokimia Gresik is the low speed of loading of fertilizer in the bag for the past 4 years. The low speed of loading fertilizer in bag tends to affect its cost. This study aims to simulate the process of loading fertilizer in bag at the Port of Petrokimia Gresik in order to find out the factors which influence the speed deterioration of fertilizer bagging process and applicable alternative scenarios to improve the process of loading fertilizer in bag. Simulations were executed using discrete simulation methods. The results show that loading speed downturn are influenced by significant factors as follows: high loading preparation time at the dock, which consumes 29,35% of loading activity; the high loading time at the dock, which reaches 23,15% of loading activity; also the extensive duration of truck commute from the warehouse to the pier which utilizes 22,95% of loading activity. This study evaluate 7 alternative improvement scenarios. According to ROI perspective, it is preeminent to additionally put field internal control personnel at each shift when loading fertilizer in bag, which can increase the loading speed to 668,29 tons / day, of investment (ROI) of 68% will be obtained within 1 year and the payback period will approximately result in 0,60 years. The best scenario in terms of loading speed is to add internal control personnel and apply a new method of loading fertilizer using a sling bag with an increase in loading rate to 804.17 tons / day, following ROI value of 23% within one year and a PP value of 0.81 year.

Distribution Network Configuration of Drilling Material to Reduce Transportation Cost Yonathan, Maykel; Pujawan, I Nyoman
IPTEK Journal of Proceedings Series No 3 (2020): International Conference on Management of Technology, Innovation, and Project (MOTIP) 2
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2020i3.11198

Drilling; the main activity in upstream oil and gas industry; is important to increase oil and gas production to supply national energy demand. PT Pertamina EP is one of oil and gas companies involved in drilling activity. As drilling schedule and number is dynamic and changing continuously, there are uncertainties in demand, excess in one warehouse and shortage in another. Consequently, double costs arise in the activity of Inter-unit Assistance related to drilling materials, with the average cost in the last 5 years reaches IDR 46,261,256,305. This research aims to design distribution network configuration of drilling materials to reduce double costs in transportation, including its cost saving estimation. The research has seven stages, i.e. (1) defining distribution network design; (2) grouping; (30 mapping warehouse locations; (4) evaluating existing warehouses; (5) selecting location of distribution center; (6) cost saving; and (7) analysis. To select distribution center location, it uses method of center of gravity. The research concludes that defining distribution strategy through distribution center is able to reduce double costs. There are 4 (four) selected of distribution center locations in Kota Baru District, Muara Enim Regency, Indramayu Regency, and Kutai Timur Regency. The research estimates that this distribution network configuration design is able to save 27.77% or IDR 26,613.231,154 in transportation cost.

Re-Design Layout and Allocation of Raw Material Warehouses Using Simulation Methods to Minimize the Handling Cost from Port to Warehouses Boy Cahyo Prihanto; I Nyoman Pujawan
IPTEK Journal of Proceedings Series No 3 (2020): International Conference on Management of Technology, Innovation, and Project (MOTIP) 2
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2020i3.11081

The high cost of raw materials handling from the port to the warehouses at PT. Petrokimia Gresik has encouraged this research to find solutions to reduce costs in raw material unloading activities. The location of factories and raw material warehouses that are separated from each other, the number of warehouses that are not yet connected with conveyor belts as well as the diverse types of raw materials become its own challenges in operating unloading activities to be more efficient. The layout and allocation of raw materials in the existing warehouses creates high cost of raw materials handling because slow moving raw materials are close to the production location, while fast moving raw materials are far from the production location. In addition, the differences in the existing unloading methods also affect the cost of raw materials unloading, the use of vessel cranes and dump trucks will increase costs, otherwise the use of conveyor belts will minimize the cost of raw materials handling. This research is important to find the layout and allocation of raw materials that have the most efficient handling costs. The steps in this study include (1) data collecting and processing; (2) making conceptual and simulation models, (3) verification and validation tests; (4) developing alternative scenarios; (5) running simulations based on alternative scenarios; (6) comparing scenarios using anova test and cost and benefit analysis. The simulation is done using Arena 14.0 software. The simulation results show that the re-design layout and allocation of 5 warehouses in Factory 2A and Factory 2B is the best alternative scenario. This scenario is proven to be able to minimize the cost of raw materials handling with savings of Rp. 10.958.028.455 per year with an ROI of 108% and a Payback Period of 0,48 years.

The Establishment of Decision Making Support Tool for Inventory Control and Production Planning with Periodic Review System and Linear Programming Approach Redy Ardiansyah; I Nyoman Pujawan; Niniet Indah Arvitrida
IPTEK Journal of Proceedings Series No 1 (2020): The 1st International Conference on Business and Engineering Management (IConBEM)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2020i1.11946

PT. Mortars is an instant cement producer with many product variants. Some problems that PT. Mortars encountered are uncertainty of demand, limitation on production capacity, and inventory capacity, which caused product shortages and high inventory costs. The production scheduling process is produced manually so it requires a long time, relying on the ability and experience of the production planner which is vulnerable to mistakes. Therefore, new methods and tools are needed for inventory control and production scheduling to make sure goods are delivered to customer just in time while maintaining operational efficiency. Periodic review system (R,S) and (R, s, S) methods are proposed in this study to improve inventory parameters and reorder systems that have an impact on service levels and inventory costs. The tools are designed using Microsoft Excel software with solver add-ins functions and linear programming approaches to generate optimal production schedule decisions automatically. In order to determine the level of service and inventory costs generated by each method, a simulation is conducted by using the tools that have been made. The simulation of the existing method produces a service level of 98,64% and a total inventory cost of Rp. 1.167.160.494. The periodic review system (R, S) method resulted in increasing service level of 0,96% and lower inventory cost of Rp. 15.130.801 while the periodic review system (R, s, S) method resulted in increasing service level of 1,29% and a lower inventory cost of Rp. 448.653 compared to the existing method. The periodic review system (R, S) method produces the lowest inventory costs while the method (R, s, S) produces the highest service level compared to other methods.

Goal Prgramming Approach in Determining Production and Delivery Decision from Two Factories Anis Rostika Sari; I Nyoman Pujawan
IPTEK Journal of Proceedings Series No 3 (2020): International Conference on Management of Technology, Innovation, and Project (MOTIP) 2
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2020i3.11202

Nowadays, the consumer goods industry is increasing rapidly due to several factors including market expansion, increasing number of producers, increasing competition, and high customer demands. Implementing the right production and shipping decision strategy is also very important in order to achieve the proper distribution function, efficiency, and profits received by the company. The development of retailer business in Eastern Indonesia of PT XYZ, cooking oil and branded vegetable fats food producer, especially the South Sulawesi area since 2017 to 2019 in modern trade category experienced quite high growth. However, due to product limitation constraints and delivery routes at Bitung factory, 82% supply was from Surabaya factory even though geographically Bitung factory is closer. Product variation limitations that cannot meet customer orders causes the non optimal goods expenditure from the Bitung factory, so the Bitung factory utility is very low. Longer shipping time via Surabaya factory often cause goods delay at the store resulting loss in sales volume and cash to cash cycle periods which is quite a time. Increased utilization of the Bitung factory, flexibility in ordering products, and shortened delivery speed pushed PT XYZ to optimize the Bitung factory expenditure through meeting sales targets of the South Sulawesi area by establishing a buffer warehouse in Makassar that serves as a transfer product loads consolidation of the Bitung factory and Surabaya factory to the point delivery destinations via land to customers in South Sulawesi Province. With the goal programming modeling method, the optimal transfer consolidation quantity from the two factories that can be removed from the Bitung factory is 1,831,312 cartons and the Surabaya Factory for products not produced from the Bitung factory is 158,105 cartons which then distributed through the buffer warehouse. Therefore, the expenditure of this amount will increase the utility capacity of handok machines in Bitung factory to 45% and canning machines to 12%. Sales target in South Sulawesi Area can reach 98.47% and 15% growth compared to last year. Faster delivery will be 10 to 14 days and cash to cash cyvle become 23 to 27 days.

Analysis of Empty Containers Supplies in the Shipping Network: Case Study at National Shipping Company Heri Cahyono; I Nyoman Pujawan
IPTEK Journal of Proceedings Series No 5 (2019): The 1st International Conference on Business and Management of Technology (IConBMT)
Publisher : Institut Teknologi Sepuluh Nopember

National Shipping Company (NSC) is a national shipping lines servicing domestic routes and a logistic key player of sea transport in Indonesia. Focus of this research is to determine total containers inventory for all routes, containers safety stocks at primary ports as well as optimum empty containers reposition strategy based on market’s requirement, all with purpose to avoid potential empty containers shortage. Unbalanced container turnover between inbound and outbound is a global issue in the shipping industry. A very common method applied by shipping operators in balancing supply and demand is repositioning excess containers to deficit areas. Determination of total container inventory begins with the calculation of safety stock of container inventory in Surabaya and Jakarta as a demand location port. Main parameter forming the calculation model is forecast cargo at home base port per route, service schedule as well as swiftness of cargo stuffing and stripping. Furthermore, determining the best routes combination shall reduce amount of container inventory. Calculation model of producing total container inventory which should be provided in 2018 is 46,382 TEUs while total existing NSC’s inventory in 2018 is 48,567 TEUs. From the total existing inventory, 2,516 TEUs turned out to be inactive (idle) for more than 30 days, meaning the active ones were 46,051 TEUs. From this comparison, calculation model is able to describe existing condition at 99.3%. Using the same model, a change in route combination with a pendulum nusantara service was carried out, which resulted in 968 TEUs reduction of container potential and reduction of one vessel allocation. This leads to potential efficiency of IDR 40,624,648,190 (forty billion six hundred twenty four million six hundred forty eight thousand one hundred and ninety Rupiah) for operational of year 2018

Design of Decision Support System in Selecting Cement Vehicles Based on Driver Performance, Expeditor Performance, and Waiting Time Ihsan Prasetya; I Nyoman Pujawan
IPTEK Journal of Proceedings Series No 5 (2019): The 1st International Conference on Business and Management of Technology (IConBMT)
Publisher : Institut Teknologi Sepuluh Nopember

Current logistics developments affect a process in any company using third party logistics. Third party logistics is a distribution service, warehousing carried out by third parties (outsourcing). Third party logistics in its business practices has been owned by many parties. PT Z is one of the companies engaged in the cement industry which has a lot of cooperation with third party logistics. PT Z has assessed the expeditor partners. The problem that occurs is the problem of each driver and expeditor in the field agreeing to the same. There are some expeditors who have good performance and vice versa. In the midst of tight business third-party logistics resulted in each expeditor competing with each other and providing the best service to his clients. This research makes a decision support system by examining aspects that make the consideration of the selection of drivers and expeditors to be used for the transport of cement in PT Z. The method used in this study is the analytical hierarchy process (AHP) according experts’ opinion in cement industry. Research uses decision support systems based on web information systems as an application method. This research can determine the choice of the driver and expeditor who has the best performance to carry out the cement transportation process at PT Z by considering the driver's waiting time. Drivers who have better results will get greater opportunities (priority) chosen to transport cement

Co-Authors Agus Wahyudi Ahmad Rusdiansyah Alexander, Dean Anis Rostika Sari Arvitrida, Niniet Indah Boy Cahyo Prihanto Budijati, Siti Mahsanah Djaya, Yansor Djumilah Zain Dody Hartanto Erly Ekayanti Rosyida Felecia Felecia Felecia Felecia Fikri, Muhammad Naufal Gan, Shu-San Hayati Mukti Asih Heri Cahyono I Gede Agus Widyadana I Gede Agus Widyadana Ihsan Prasetya Irwansyah Iwan Vanany Lestari, Purbo Nani Kurniati Petrus Setya Murdapa Putera, Rizki Revianto Putu Dana Karningsih Raja Zuraidah Raja Mohd Ras Redy Ardiansyah Resista Vikaliana Savitri, Niken Anggraini Stefanus Eko Wiratno Suparno Surachman Surachman Wakhid Ahmad Jauhari Wakhid Ahmad Jauhari Yonathan, Maykel

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