IPTEK Journal of Proceedings Series
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Distribution Network Configuration of Drilling Material to Reduce Transportation Cost
Full text linkDrilling; 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
Comparing Between Production Scheduling Methods to Achieve Efficient Resource Utilization
Full text linkHigh competition among industries nowadays, requires companies to improve their production services. The speed of production service time, with excellent quality, becomes part of the company’s competitive advantage. This study aims to compare several production scheduling methods which are commonly used, so that efficient resource utilization can be obtained. Production Scheduling Methods such as Make to Order, Dannenbring, Branch and Bound, Nawaz Enscore and Ham and Campbell Dudeck Smith were compared using one case of tire retreading production. There were two jobs: tire retreading for truck and bus. Each job, assigned to ten workstations following its production steps. The results were obtained that Dannenbring and Campbell Dudeck Smith gave the same best results with the smallest makespan value, equivalent to 48% efficiency
Risk Analysis and Mitigation in the Procurement Process of Overhaul Services
Full text linkPT. XYZ is one of subsidiaries of state-owned company which has core business in Power Generation and Operation & Maintenance (O&M) Services for power plants. There are a lot of challenges that should be faced by PT. XYZ as a maintenance unit to achieve the on cost, on time and on quality target. Therefore, we need an analysis and risk mitigation in the procurement process of overhaul routine services to assist companies in dealing with potential risks. Risk identification is carried out using literature studies and expert panels. After that, the risk will be analyzed using the Analytic Network Process and House of Risk methods. The use of the ANP method in this study is as additional tools to support the HOR method because in this study it is possible to have a relationship between risk events and risk agents. This relationship is not captured by the HOR method because the HOR method only considers the relationship between the risk event and the risk agent. The results shows that there are 23 risk events that caused by 37 risk agents. Based on ARP result, there are 2 main mitigation efforts that can be done by the company which are increase the coordination between stakeholder and implemented the time-based contract for overhaul routine services. These efforts hopefully could help the company to reduce the probability of risk agents so the overhaul will not be affected
Dynamic System Modeling of Renewable Energy Diversification at ITS Surabaya as a Sustainable University Management Effort
Full text linkDiversification is an effort to diversify various energy sources through reducing the use of fossil energy sources and substituting them with other energy sources including RE in order to optimize energy supply. Meanwhile, energy conservation is a systematic, planned and integrated effort to conserve existing energy resources and increase the efficiency of their use. Energy has a very significant role in human life in all sectors. Where energy demand in the commercial sector such as offices and services is still largely dominated by electricity around 60% -70%. Where the management is still largely managed by the State Electricity Company (PLN). The electricity consumption of the ITS Surabaya campus in 2019 around 9,586,857.72 kWh / year is still supported by PLN with a total expenditure of more than 9 billion. Considering the Indonesian government's program on the Target of Diversification of RUEN at least 23% in 2025 and 31% in 2050 and one of the 2030 Agenda for Sustainable Development Goals (SDGs) globally namely clean and affordable energy, the ITS Surabaya management effort is to achieve diversification of energy sources 50% renewable as stated in the 2015-2020 RENSTRA Target. The effort to diversify this renewable energy is by building a 16 KWP On Grid Solar Power Plant in the Research Center Building, which has produced around 26,290.92 kWh / year during the 2019 period
Kinematic Analysis of SAVGS
Full text linkThe SAVGS as active low bandwidth retrofitted in the double-wishbone arrangement is studied. In this study, two configurations of arm linkages and variations of single-link are investigated. A linear equivalent model of the quarter car is presented based on energy conservation principles. The estimated results captured that the spring stiffness and damping coefficients of the equivalent model behave smaller when lengthening the lower arm geometry. On the other hand, the spring stiffness, damping coefficients, and linear actuator speed of the equivalent model increase when lengthening the single-link
System Thinking Approach to Increase Eco-Friendly Maize Production to Support Food Security
Full text linkFood security is a high-priority issue for sustainable global agricultural development both quantitatively and qualitatively. Maize is one of the most important food crops in the world after rice and wheat. The biggest contribution of maize production in Indonesia comes from East Java Province, which is 25,60%. Maize production is changing due to increased consumer demand, increased input costs, concerns about food security, and environmental impacts. Climate conditions of marginal land areas (drought) and the use of chemical fertilizers continuously have negative impacts on the amount of production, food security, and soil quality (environment). This situation is dangerous because it will affect the income from farming. Based on these problems, in this study, a system dynamics prospective study will be conducted to develop a conceptual model (Causal Loop Diagram) to increase eco-friendly maize production to support food security. The results of the study are conceptual models that have some important information regarding internal and external factors that affect the productivity and production of eco-friendly maize. The conceptual model produced can be used by the government and stakeholders for decision-making in developing strategies and policies related to eco-friendly maize cultivation systems to support food security. Further research can be done by developing several scenarios to predict the state of the maize farming system in the future
Multicriteria Analysis to Determine Locations of Restaurant Branch Using Bayesian Network
Full text linkTo determine a strategic restaurant location, a company has to consider several location criteria. Location criteria is divided into two perspective, namely customer perspective and management perspective. The purpose of the consideration of restaurant location criteria are to attract customer to come in so could obtain maximum profit for the unit business. Every restaurant has different location criteria, that is influenced by market segmentation of restaurant and business strategic of the company. The aim of this research is to learn about general restaurant location criteria, investigate specific restaurant location criteria, and do an assessment to obtain appropriate location alternative. Specific restaurant location of this research is location of Ayam Geprek “AG” Restaurant. This research use Bayesian Network Method to process probability of the criteria. This research obtain the data from questionnaire to management and potential customer Ayam Geprek “AG” Restaurant. The questionnaire consist of two steps, the first step is choices for Ayam Geprek “AG” criterion restaurant. The second questionnaire is about level of importance assessment every location criteria. There are three alternative location that will be rated based on the Ayam Geprek “AG” criteria. The result for the appropriate alternative is third alternative which are located in west Surabaya and has total score 18.11
Space Transformation Due to Conflict: Changes from Agricultural to Industrial Space in Manyar District, Gresik Regency
Full text linkChanges in the spatial area showed the dynamics of political economy. There is a problem regarding power relations in reproducing space, which will trigger a conflict between interests. These land changes, especially those related to changes in the form of agricultural land use to non-agricultural, have resulted in the loss of income sources for farmers. This paper focuses on the transformation of agricultural land into a non-agricultural one caused by conflict between several elements, including the local government, private businessmen, and the community, especially fishpond farmers who experience marginalization of agricultural land due to industrial development in Gresik Regency. The research is conducted using a qualitative approach with a descriptive type to support more in-depth research in analyzing urban spatial planning issues in the perspective of seeking spatial politics in Gresik district. The current reality is that the government tends to be more aligned with capital owners, which implies that spatial planning is manifested by profit-oriented development, high economic growth, and accumulation. The government mostly ignores ecological and social dimensions, which it considers non-linear with economic investment
Implementation Lean Manufacturing Method of Plywood Manufacture Company
Full text linkThe Plywood company in this study was able to produce 6,000m3/ year of plywood, but during 2018 and 2019 this company was only able to provide 2,905.14 m3/year and 1,120.73 m3/year. Production in 2018 and 2019 is far below the production capacity. This research will apply the lean manufacturing concept in the production process of a plywood company. This research uses value stream mapping (VSM), value stream analysis tools (VALSAT), process activity mapping (PAM), Pareto diagrams, and root cause analysis. It is found extreme categories that occur in many processes, namely processing production and inventory. The recommendations given are to reduce employees and provide adequate storage. The future state VSM shows that a change in a lead time of 68%, and the reduction of the production process is 248.18 minutes.
Financial Distress Prediction Models in Property Sector Companies Listed in Indonesia Stock Exchange
Full text linkAlong with the unstable national and global economic conditions, investors and consumers defend themselves to invest in the property sector. Companies go public in obtaining capital markets as a means to obtain sources of funds. Investors and creditors will see the financial condition required before the company will increase financial distress (financial distress) or not before investing their capital. Therefore, analysis and prediction of a company's financial problems is very important. This study uses the Financial Distress model by using discriminant analysis. The independent variables used are financial ratios which are divided into 4 categories (1) Liquidity Ratios, (2) Solvency Ratios, (3) Activity Ratios, (4) Profitability Ratios. This research uses quantitative with the Multivariate Discriminant Analysis (MDA) model. The sample data used in this study includes property, real estate, and construction sector companies listed on the Indonesia Stock Exchange in the 2014-2018 period. This study produces a financial distress model Z-score = -3,569 + 6,910DTA -1.107DTE + 7,515ROE + 3,573OPM with a cut-off value of -3,521. When the z-score of the company -3,521, the company is included in the non-financial pressure group