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International Journal of Global Operations Research

ijgor
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Published by Indonesian Operations Research Association

ISSN : 27231747 EISSN : 27221016 DOI : https://doi.org/10.47194/ijgor

Core Subject : Economy, Science, Education, Engineering,

Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Mathematics

International Journal of Global Operations Research (IJGOR) is published 4 times a year and is the flagship journal of the Indonesian Operational Research Association (IORA). It is the aim of IJGOR to present papers which cover the theory, practice, history or methodology of OR. However, since OR is primarily an applied science, it is a major objective of the journal to attract and publish accounts of good, practical case studies. Consequently, papers illustrating applications of OR to real problems are especially welcome. In real applications of OR: forecasting, inventory, investment, location, logistics, maintenance, marketing, packing, purchasing, production, project management, reliability and scheduling. In a wide variety of environments: community OR, education, energy, finance, government, health services, manufacturing industries, mining, sports, and transportation. In technical approaches: decision support systems, expert systems, heuristics, networks, mathematical programming, multicriteria decision methods, problems structuring methods, queues, and simulation. Topics Covered: Computational Intelligence Computing and Information Technologies Continuous and Discrete Optimization Decision Analysis and Decision Support System Applied Operations Research in Education Engineering Management Environment, Energy and Natural Resources Financial Engineering Applied Operations Research inGovernment Heuristics Industrial Engineering Information Management Information Technology Inventory Management Knowledge Management Logistics and Supply Chain Management Maintenance Manufacturing Industries Applied Operations Research in Marketing Engineering Markov Chains Mathematics Actuarial Sciences Military and Homeland Security Networks Operations Management Organizational Behavior Planning and Scheduling Policy Modeling and Public Sector Applied Operations Research inPolitical Science Production Management Applied Operations Research inPsychology Queuing Theory Revenue & Risk Management Services management Simulation Applied Operations Research inSociology Applied Operations Research inSports Statistics Stochastic Models Strategic Management Systems Engineering Telecommunications Transportation And so on

Arjuna Subject : Umum - Umum

Articles 174 Documents

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Optimization of The Best Line-up in Football using Binary Integer Programming Model Mahrudinda, Mahrudinda; Supian, Sudradjat; subiyanto, subiyanto; Chaerani, Diah
International Journal of Global Operations Research Vol. 1 No. 3 (2020): International Journal of Global Operations Research (IJGOR), August 2020
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v1i3.45

This paper aims to find the formation with the best line-up of the Liverpool FC football team in the English Premier League in the 2020/2021 season. Researchers used binary integer programming (BIP) modeling to determine optimum solutions. The data used for this optimization is the rating value of the players recorded in the performance data from the previous matches. The optimum result of this problem is the selection of variables that are valued at 1, namely {x_1, x_4, x_6, x_8, x_21, x_28, x_34, x_37, and x_39}Â for formations 4-3-3 with a maximum value of 82.47, and variables {x_1, x_6, x_7, x_8, x_11, x_14, x_16, x_29, x_31, x_32, andx_42} for 4-2-3-1 formations with a maximum value of 80.04. The 4-3-3 formation is more effective because it has a higher maximum rating than the 4-2-3-1 formation.Â 4-3-3 formation is an attacking formation with a higher intensity of attack and faster thanÂ 4-2-3-1 formation that tends to defend moderately.

Optimal Forestry Model Control with Logging and Tourism Factors Aji Pratama, Mochammad Andhika
International Journal of Global Operations Research Vol. 1 No. 2 (2020): International Journal of Global Operations Research (IJGOR), May 2020
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v1i2.33

Forest is one of the natural resources that need to be preserved because it has vital functions for humans both ecologically and economically. In this study, a mathematical model of forestry dynamics was developed by dividing the forest area, indigenous people, non-indigenous people, population pressure and economic incentives. The model was analyzed by dynamic system theory, the existence of equilibrium points and their stability were determined. Using the second Lyapunov method, global stability was also determined. In that forestry model, logging and tourism factors were added which affect the dynamics of forest biomass. The Pontryagin maximum principle was used to obtain optimal conditions from the model. Numerical simulation shows that the use of forests by logging and tourism, reduces the amount of forest biomass, but the forest remains sustainable. Utilization of forests bycontrols will maximize the benefits of logging and tourism in the associated forests.

Comparison of Numerical Simulation of Epidemiological Model between Euler Method with 4th Order Runge Kutta Method Ashgi, Rizky; Pratama, Mochammad Andhika Aji; Purwani, Sri
International Journal of Global Operations Research Vol. 2 No. 1 (2021): International Journal of Global Operations Research (IJGOR), February 2021
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v2i1.67

Coronavirus Disease 2019 has become global pandemic in the world. Since its appearance, many researchers in world try to understand the disease, including mathematics researchers. In mathematics, many approaches are developed to study the disease. One of them is to understand the spreading of the disease by constructing an epidemiology model. In this approach, a system of differential equations is formed to understand the spread of the disease from a population. This is achieved by using the SIR model to solve the system, two numerical methods are used, namely Euler Method and 4th order Runge-Kutta. In this paper, we study the performance and comparison of both methods in solving the model. The result in this paper that in the running process of solving it turns out that using the euler method is faster than using the 4th order Runge-Kutta method and the differences of solutions between the two methods are large.

Development of Integrated Offline Learning Multimedia to Improve Student Learning Out Comes Kuron, M A; Tompodung, M L
International Journal of Global Operations Research Vol. 1 No. 1 (2020): International Journal of Global Operations Research (IJGOR), February 2020
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v1i1.14

The research about development of integrated offline leaning multimedia aims to improve student learning outcomes and facilitate the learning process effect of use science materials teaching used multimedia software to improve students achievement. The subject of this research is VIIIB class with 22 numbers at Ranoyapo 2 State Junior High School. The research use Research and Delevopment (R & D) method with design by subject of experiment and seven models of development by Brog and Gall. This model consist of 7 step that are 1) Planning 2) Exploration study 3) Product development 4) Validation, 5) Data collection and analysis, 6) Product revition and 7) Dessimination. This integrated offline learning multimedia has been test by materials and media expert with questioner and has been revision. After that, the integrated offline learning multimedia has been tested by students in class VIIIB to known the student respons and student achievement with straight motion materials at sciences lesson. In the real class, students have given two treatments also called one period and two period. One period, students has teached by conventional models by commonly media used and Second period, students has teached used integrated offline learning multimedia that is research produce. The significant of normality by first period is 0.070 and the second is 0.133 is higher than the 0.05 of degree so that we conclusion that both of period are normal distribution. The analysed of this research used SPSS application be obtained significansi<0.05 so H0 is rejected and H1 is accepted, so the conclution said that there is a significant influence on student learning outcomes between teached by integrated offline leaning multimedia models and teached by conventional models.

Order Runge-Kutta with Extended Formulation for Solving Ordinary Differential Equations Suryaningrat, Wahyu; Ashgi, Rizky; Purwani, Sri
International Journal of Global Operations Research Vol. 1 No. 4 (2020): International Journal of Global Operations Research (IJGOR), November 2020
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v1i4.61

The mathematical model has been used to understand many phenomena and natural interactions. Since including many variables and parameters, the complex models are not easy to find analytical solutions. In this paper, we analyze one of the family of Rungeâ€“Kutta method with an expansion of evaluation function. We applied the proposed method to solve ordinary differential equations problems and compared it with other well-known Runge-Kutta methods. The computation cost and accuracy for each method have been analyzed.

THE DEVELOPMENT OF WEB-BASED CREDIT TRANSFER APPLICATIONS IN THE FACULTY OF SCIENCE AND TECHNOLOGY UNIVERSITAS TERBUKA (A CASE STUDY IN THE INFORMATION SYSTEM PROGRAM) Nurdiana, Dian; Susilo, Adhi; Aprijani, Dwi Astuti; Suryadi, Andri
International Journal of Global Operations Research Vol. 2 No. 4 (2021): International Journal of Global Operations Research (IJGOR), November 2021
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v2i4.84

The implementation of credit transfer at Universitas Terbuka refers to the Rector's Regulation Number 119, 2018. This credit transfer could only be carried out once when students registered themselves at very first time. Recognition of credit transfer is accepted whn accomplishment of courses have been obtained from their previous universities. Through the provision of credit transfer recognition services, students are expected to be able to finish their study faster. Students can apply for credit transfer through the Faculty which would then be proceed by Study Program. Students are required to collect documents such as diplomas, transcripts, descriptions of courses at their previous university, and the submissions for courses intended to be transferred for credit. The documents which are in form of print out would later be processed in their respective Study Programs. During the process, the Study Program compiled the documents manually by recording and determining the courses approved for credit transfer. However, the study Program hasnâ€™t used a special application. Due to this limitation, several problems occurred in the process, such as the absence of filing the credit transfer application documents, the ineffectiveness of storing the credit transfer master block in the Study Program, and the large number of credit transfer applications. These problems often result in delays in the credit transfer process, thus disrupting academic services for students. Therefore, it is necessary to develop a credit transfer application that can assist in the implementation of credit transfer in the Faculty of Science and Technology. The methodology used to develop this credit transfer application is the waterfall model. For design modeling using UML (Unified Modeling Language), while software testing uses Black Box Testing and usability and acceptance tests applied the PSSUQ (Post-Study System Usability Questionnaire) method. From the results of the tests, it showed that Black Box Testing got test results of 100%, while the usability and acceptance tests using the PSSUQ method got 68% of respondents. The conclusion of this study showed that the application is ready to use and the users Agree/Good/Like on the development of a web-based credit transfer application at the Faculty of Science and Technology of the Universitas Terbuka (case study of Information Systems Study Program).Â Kata kunci: Credit transfer, Web, Waterfall, , Black Box Testing, PSSUQ.

Determining Agricultural Premium Insurance in Malang City using Black Scholes Model Widi, Herlia; Lani, Dea Nisa Rahma; Hasanah, Faridatul
International Journal of Global Operations Research Vol. 2 No. 2 (2021): International Journal of Global Operations Research (IJGOR), May 2021
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v2i2.81

This study examines the determination of rainfall-based agricultural insurance premium prices using the Black-Scholes model. The Black-Scholes model was originally used to determine the price of European-type options. The research method used is a literature study with secondary data collection. The data used in this study are rainfall data and rice production results in the city of Malang from 2015 to 2020. Based on the results and discussion, rainfall which is strongly correlated with rice production results is in quarter 2. The premium results obtained are different according to the desired percentile. In addition to percentiles, taking R_0 also affects the premium price. When R_0=322, the premium price tends to be cheaper than R_0=271.

Teak Wood Marketing Mix and Itâ€™s Contribution to Communities Around the Forest Area at Perum Perhutani KPH Tasikmalaya Zahra, Inqita; Saputra, Moch Panji Agung
International Journal of Global Operations Research Vol. 3 No. 1 (2022): International Journal of Global Operations Research (IJGOR), February 2022
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v3i1.121

Perum Perhutani's revenue is dominated by the sale of teak and rosin. Sales of teak wood from Perum Perhutani KPH Tasikmalaya has been decreasing during the Covid-19 pandemic, due to some marketing constraints. The objectives of this study were: (1) to analyze the marketing efficiency of teak wood at Perum Perhutani KPH Tasikmalaya, (2) to analyze the marketing mix strategy of teak wood at Perum Perhutani KPH Tasikmalaya, and (3) to analyze the contribution of the utilization of teak by Perum Perhutani to the total household income of the community. around the forest in KPH Tasikmalaya. The marketing efficiency of teak wood is analyzed using three indicators, namely marketing margin, farmer's share, and the ratio of profit to the marketing cost. Marketing mix strategy analysis and contribution analysis were conducted by in-depth interviews with respondents and observation techniques. This study indicates that the marketing of teak wood is relatively efficient and profitable for producers because it has a large farmer's share value and K/B ratio (profits to marketing costs), namely 100% and 19.60, respectively. In addition, the marketing margin on the marketing of teak produces a very low value of IDR0. The implementation of the marketing mix strategy is well implemented by Perum Perhutani KPH Tasikmalaya. However, it is necessary to pay attention to the promotion aspect, namely the expansion of the marketing system through the internet, and the production aspect, namely the policy on teak wood product guarantees. The utilization of teak wood in Perum Perhutani KPH Tasikmalaya contributes to the total household income by 32%. The contribution of teak wood utilization in PHBM activities is only as additional income because overall the income from non-PHBM activities is greater than the income from PHBM activities.

Estimating the Expected Shortfall in MYOR Stock Using the ARIMA-GARCH Model Saputra, Jumadil; Simanjuntak, Alberto
International Journal of Global Operations Research Vol. 2 No. 3 (2021): International Journal of Global Operations Research (IJGOR), August 2021
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v2i3.89

Stocks are one of the best-known forms of investment and are still used today. In stock investment, it is necessary to know the movement and risk of loss that may be obtained from the stock investment so that investors can consider the possibility of profit. One way of calculating risk is to use the Expected Shortfall (ES). Because the stock movement is in the form of a time series, a model can be formed to predict the movement of the stock which can then be used for ES calculations using time series analysis. The purpose of the study was to determine the expected shortfall value of MYOR shares using time series analysis. The data used for this research is the daily closing price of shares for three years. In the time series analysis stage, the models used in predicting stock movements are Autoregressive Integrated Moving Average (ARIMA) for the mean model and Generalized Autoregressive Conditional Heteroscedasticity (GARCH) for the volatility model. The average value and variance obtained from the model are then used in calculating the ES on MYOR stock. Based on the results of the study, it was obtained that MYOR's stock had an ES of 0.050772. This means if an investment is made for MYOR shares of IDR 1,000,000.00 for 37 days (5% of 751 days) for an investment period with a 95% confidence level, the expected loss to be borne by the investor is IDR 50,772.00.

Online Practicum Design (Praton) in Assisting Learning Process of Database Courses in the Information System Department, Universitas Terbuka, Indonesia Suryadi, Andri; Sufandi, Unggul Utan; Nurdiana, Dian
International Journal of Global Operations Research Vol. 2 No. 2 (2021): International Journal of Global Operations Research (IJGOR), May 2021
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v2i2.83

The development of technology is an inseparable part of human life. Through its development,Â technology furthermore produces various reliable tools to assist people in many ways. The technological applications can be in the forms of Google products such asÂ Google Classroom, Google Form, and Google meet, and also other applications such as Zoom Cloud Meeting, Microsoft TeamsÂ intended to solve various kinds of problems including education field. These technological advancements are popularly used and are indeed very helpful in learning, but sometimes it canâ€™t be hindered that technological applications are not always in accordance with the needs. For example, the practicum learning process in the Information Systems Study Program, Faculty of Science and Technology, Open University, which has no practical application yet. This is because the existing applications are not in accordance with the learning process at the Open University. So, the solution that must be done is to develop an online practicum application (Praton) in the Information Systems Study Program, Faculty of Science and Technology of the Open University. The process of developing a practicum application also cannot be done immediately, so at least there must be an application development design first. Application development design must go through several stages using a software development model. One of the models that can be used is the waterfall model with an object-based approach or commonly referred to as UML (Unified Modeling Language). The results of this software development design are in the form of a software design document and will be sent to a programmer to establish the application. With this application design, programmers will know more about the specifications of online practicum applications that suit the needs of learning process.

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Editorial Address Jl. Merkuri Timur VI No. 1, RT. 007, RW. 004, Manjahlega, Rancasari, Kota Bandung, Jawa Barat, INDONESIA

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Contact Name
-

Contact Email
ijgor.iorajournal@gmail.com

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+6285841953112

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ijgor.iorajournal@gmail.com

Editorial Address
Jl. Merkuri Timur VI No. 1, RT. 007, RW. 004, Manjahlega, Rancasari, Kota Bandung, Jawa Barat, INDONESIA

Location
Kota bandung,

Jawa barat

INDONESIA