Open Access Original Article | |||
1. |
The relationship between the transportation export value and energy consumption of Thailand
, Pages: 1-12 Kitimaporn Choochote, Sukanya Sirimat, Tanawat Watchallanun and Sakkarin Nonthapot PDF (416 K) |
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Abstract: This study was conducted to consider the relationship between the transportation export value (TR) and energy consumption of Thailand (EN) in the long run by a comparative analysis that relied on testing by the ARDL and NARDL models. The Granger causality of each item was also tested by quarterly time series data from Quarter 1 of 2011-Quarter 4 of 2021. The results revealed a long relationship from the EN to TR. However, only the reduction of the TR affected the EN. According to the results, the energy agencies of Thailand should maintain the balance of EN and sufficient energy imports to drive the TR for its stability. DOI: 10.5267/j.dsl.2022.11.002 Keywords: Transportation planning, Energy, Export, ARDL, NARDL
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Open Access Original Article | |||
2. |
The opportunistic newsvendor problem: Defining the optimal purchase quantity of resalable items, whose value may appreciate
, Pages: 13-28 Francesco Zammori, Giovanni Romagnoli and Serena Filippelli PDF (416 K) |
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Abstract: With Newsvendor Problem (NvP) we refer to a specific class of inventory management problems, valid for a single item with stochastic demand over a single period. In the standard version, the newsvendor is allowed to issue a single order, before he or she can observe the actual demand. Since the newsvendor can face both overage and underage costs, due to lost sales or residual stock, the objective is to define the optimal order size that maximizes the expected profit. In this paper, we consider a specific version of the NvP, in which the buyer has the opportunity to make a last and single order for opportunistic reasons. Specifically, we consider discontinued, collectible items, for which demand will not vanish and whose value might appreciate. Hence, the objective is to define the optimal quantity that should be purchased, just before the item is retired from the market or sold-out, and that should be sold as soon as the price rises over a predefined target level. An optimal solution, maximizing the expected profit, is obtained both in case of negligible and non-negligible stockholding costs. In the latter case, to obtain the optimal solution in implicit form, some simplifying assumptions are needed. Hence, a thorough numerical analysis is finally performed, as a way to empirically demonstrate both the robustness and the accuracy of the model, in several scenarios differentiated in terms of costs and customers’ demand. DOI: 10.5267/j.dsl.2022.11.001 Keywords: Newsvendor problem, Opportunistic purchases, Perishable items, Collectible items, Numerical optimization
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Open Access Original Article | |||
3. |
Analyzing the community decision making to purchase pet insurance: Case study of animal lovers in Indonesia
, Pages: 29-40 Sukono, Dwi Susanti, Fadhilla Ridwan, Riaman, Elis Hertini and Jumadil Saputra PDF (416 K) |
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Abstract: This study aims to measure people's decision-making to buy their pet insurance and compare it with the amount of insurance premium rates offered. It is important due to the increase in people's income which has triggered the birth of a community of pet lovers as part of the middle-class people’s lifestyle in Indonesia. The survey data was conducted using the Stated Preference (SP) format through questionnaires and interviews to determine the public response to pet insurance premiums. The collected data were analyzed using descriptive methods, decision-making analysis was on the basis of the choice of the dichotomous Contingent Valuation Method (CVM), and logistic regression analysis. Based on the calculation analysis using the logit method shows that the ability of the public to pay pet insurance premiums is IDR289,454.54. Analysis of calculations using the Turnbull method was obtained at IDR365,000.00. The results of the WTP amount, both using the logit method and using the Turnbull method, are greater than the minimum premium amount offered which is IDR190,000.00. The results of this study indicate that the premium rates for pet insurance offered are still within reasonable limits, compared to the size of the decision-making by the animal lover community in Indonesia. This provides a very good prospect for insurance companies that have insurance products for pets in Indonesia. This study was conducted to provide empirical evidence that the decision-making of the animal lover community is greater than the premium rate for pet insurance that has been offered. Thus, this research strongly supports the development of pet insurance companies in Indonesia, which can provide pet protection to stay healthy and well looked after. DOI: 10.5267/j.dsl.2022.10.008 Keywords: Buying decision making, Stated Preference, Dichotomous Choice, Contingent Valuation Method, Pet Insurance
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Open Access Original Article | |||
4. |
Two-objective optimization of preventive maintenance orders scheduling as a multi-skilled resource-constrained flow shop problem
, Pages: 41-54 Masoud Fekri, Mehdi Heydari and Mohammad Mahdavi Mazdeh PDF (416 K) |
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Abstract: In this article, the application of the Multi-Skilled Resource-Constrained Flow Shop Scheduling Problem (MSRC-FSSP) in preventive maintenance as a case study has been investigated. In other words, to complete each maintenance order at each stage, in addition to the machine, a set of required human resources with different skills must be available. According to human resources skills, each of them can perform at least one order or at most N orders, and each maintenance order must be done by a set of human resources with different skills. To carry out a maintenance order, different human resources must be in communication and cooperation so that a preventive maintenance order can be completed. In this article, these resources are considered as technical supervisors, repairmen and maintenance managers who complete all maintenance orders in a flow shop environment as a job. For this problem, a new Mixed Integer Linear Programming (MILP) model has been formulated with the two-objective functions, minimizing total orders completion time and the human resources idle time. To solve the model on a small scale, CPLEX is used, and to solve it on a large scale, due to the fact that this problem is NP-Hard, a meta-heuristic algorithm named Genetic Algorithm (GA) is presented. Finally, the computational results have been done to validate the model, along with the analysis of the human resources idle time. DOI: 10.5267/j.dsl.2022.10.007 Keywords: Flow shop Scheduling, Maintenance Scheduling, Genetic Algorithm, Multi-Skilled Resource-Constrained Scheduling
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Open Access Original Article | |||
5. |
Adoption of IoT by telecommunication companies in GCC: The role of blockchain
, Pages: 55-68 Mohammed Alarefi PDF (416 K) |
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Abstract: The Internet of Things (IoT) has become essential for business. The adoption rate of IoT has dropped recently and this could be due to security, privacy, and trust issues. Blockchain (BC) has the potential to mitigate the risk of security, privacy, and trust. However, few studies examined the integration between IoT and BC in the context of developing countries. The purpose of this study is to examine the predictors of IoT adoption by telecommunication companies in the Gulf Cooperation Council (GCC). In addition, the study aims to examine the moderating role of BC as well as the effect of using IoT and BC on the competitive advantage of companies. Based on technology acceptance model, social exchange theory, and resource-based view, the study proposed that security, privacy, trust, communication quality, perceived ease of use (PEOU), and perceived usefulness (PU) affect positively the adoption of IoT. BC is proposed as a moderating variable and expected with IoT to affect the competitive advantage of companies. The population includes all the telecommunication companies in GCC. Data was collected using purposive sampling from IT professionals. The results of data analysis using SmartPLS showed that security, privacy, trust, PU, and PEOU positively affected the adoption of IoT. BC and IoT adoption have a positive effect on competitive advantage. Further, BC moderated only the effect of security and privacy on the adoption of IoT. Services providers must enhance the security, privacy, and trust of IoT services by deploying BC technology. Effective integration of IoT and BC will lead to the achievement of competitive advantages. DOI: 10.5267/j.dsl.2022.10.006 Keywords: Internet of Things, Blockchain, Competitive Advantage, GCC
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Open Access Original Article | |||
6. |
A novel memory-based simulated annealing algorithm to solve multi-line facility layout problem
, Pages: 69-88 Kamran Zolfi, Javid Jouzdani and Hadi Shirouyehzad PDF (416 K) |
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Abstract: In this paper, a memory-based simulated annealing algorithm called the Dual Memory Simulated Annealing Algorithm (DMSA) is presented to solve multi-line facility layout problems. The objective is to minimize the total material handling cost. Two memory buffers and a restart mechanism are considered. Two benchmark problems were selected from the literature review papers and solved using the standard simulated annealing (SA) algorithm and the DMSA. The obtained results show that solutions provided by the DMSA algorithm are cost-effective compared to the standard SA algorithm and the other algorithms used for solving these test cases. Moreover, to further evaluate the performance of the DMSA algorithm in large scale problems, eleven test cases were selected from the benchmark library of the quadratic assignment problem (QAP). According to the results, the performance of the algorithm in finding solutions to complex problems is exemplary. DOI: 10.5267/j.dsl.2022.10.005 Keywords: Multi-line Facility Layout Problem, Memory-based Simulated Annealing, Layout
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Open Access Original Article | |||
7. |
HC-UAP: Outliers detection method based-on hierarchical clustering for universally aligned time-series RNA-Seq profiles
, Pages: 89-96 Abedalrhman Alkhateeb PDF (416 K) |
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Abstract: Tracking abundant gene transcripts quantification over continuous cancer progression stages may reveal the mechanism of disease advancement. In this work, we profile the transcript quantification over the stages using a time-series approach, in which the stages/sub-stages of the disease are the time points, and the quantification measurements are the values. The values over time points are used to interpolate the growth of the progression using the cubic spline function. Then, the transcripts profiles are universally aligned and clustered using the time-series profile hierarchical clustering method based on the area between each pair of the aligned profiles; the method is named (HC-UAP). We compare the proposed method with a hierarchical clustering method based on Euclidean distance (HC-ED). Both methods were applied on two next-generation sequencing (NGS) prostate cancer datasets, the first from the Chinese and the second from the North American population. HC-ED clusters the dataset to find patterns while HC-UAP was able to single out outliers that trend differently in both datasets. While finding patterns in gene expression that trend over stages is the standard approach for analyzing time-series models, identifying outlier transcripts that grow differently than other transcripts can provide more details about the contribution of the mRNA transcriptional activity to the disease. They also can be a potential biomarker for the disease progression. DOI: 10.5267/j.dsl.2022.10.004 Keywords: Next-generation sequencing, Transcriptome, RNA-Seq, Time-series, Clustering
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Open Access Original Article | |||
8. |
A strategy for reducing skills gap for the game development sector of the Indonesian creative industries
, Pages: 97-106 Minaldi Loeis, Musa Hubeis, Arif Imam Suroso and Sukiswo Dirdjosuparto PDF (416 K) |
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Abstract: The Indonesian creative economy has been on the rise since 2015 when it has started being measured and prioritized by the government. Its contribution towards the Indonesian GDP has risen significantly as well. A small part of that creative sector is the video game industry and market. The video game global market will be worth USD 200 Billion in 2023. Indonesia currently is ranked 16th in terms of market size. Although having an enormous market opportunity, local video game producers only contribute 1%. Growth opportunities exist, however local game studios are facing the difficulty of recruiting quality game developers. Higher education institutions need to produce graduates having the knowledge, competences, and skills relevant for their work. This study is done to identify and prioritize attributes for the design of a university level program in game development that ensures employability in the sector. A qualitative thematic analysis is done in identifying the important factors for an academic program, followed by an analytical hierarchical process in determining the factors. Result of the study shows that a curriculum with internships in game studios, ensuring students are knowledgeable on the business models & video game market, having practitioners teach in the program, and creating a community of practice in the university is essential in producing quality graduates. DOI: 10.5267/j.dsl.2022.10.003 Keywords: Video game, Higher education, Curriculum design, Creative industry, Indonesia
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Open Access Original Article | |||
9. |
Decision-making model to predict auto-rejection: An implementation of ARIMA for accurate forecasting of stock price volatility during the Covid-19
, Pages: 107-116 Suripto PDF (416 K) |
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Abstract: This study aims to determine an accurate forecasting model, especially an error rate of around 0, and to examine how the automatic rejection system reacts to stock price as a result of the pandemic. The statistical clustering method is used for the dataset in form of daily observations, while the sample covers the period of cases before and after COVID-19 pandemic from 02 January 2019 to 20 June 2020 at the Trinitan Minerals and Metal Company. Furthermore, the data used in the estimation are the opening and closing price of returns, which are later processed using SAS analysis tools. It is shown that the most appropriate decision-making processes are those proven to be most effective. Therefore, predicting future events based on a suitable time series model will help policymakers and strategists make decisions and develop appropriate strategic plans regarding the stock market. Meanwhile, 98% of the ARIMA (1,1,1) is a forecasting model which can be applied to predict stock prices. The new approach of this study is an integrated autoregressive moving average used as an attempt to accurately predict stock prices during a pandemic. DOI: 10.5267/j.dsl.2022.10.002 Keywords: Decision making, Stock price, Auto-rejection, ARIMA, Covid-19, Forecasting
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Open Access Original Article | |||
10. |
Assessing the factors for humanitarian logistics digital business ecosystem (HLDBE) using a novel integrated correlation coefficient and standard deviation - combined compromise solution (CCSD-CoCoSo) method
, Pages: 117-136 Benjamin Ohene Kwapong Baffoe, Wenping Luo, Qiao Hong Pan, Sheng Hong Zhou, Mei Ju Wu, Louis Kofi Desire Atimu, Peter Adjei Darko and Evans Opoku-Mensah PDF (416 K) |
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Abstract: This study updates Humanitarian Logistics Digital Business Ecosystem framework coupled with the development of a proposed integrated CCSD-CoCoSo MCDM method to rank factors used in assessing humanitarian and business logistics actor’s propensity to use, diffuse, and adopt a collaborative digital business ecosystem platform for their future operational use. Employing nine criteria derived from technology innovation theories and institutional theory, and 28 experts comprising our decision matrix. The findings report perceived relative advantage, perceived safety and security, and infrastructure and expertise as the top three vital criteria that experts believe when addressed in an ecosystem platform for humanitarian and business logistics actors it would encourage a collaboration for their sustainable future operations. With organisational culture and structure as the least prioritised criteria. The study concludes that the CCSD-CoCoSo obtained results are objective, validating, and that this model is useful and suitable for MCDM analysis and policy making. DOI: 10.5267/j.dsl.2022.10.001 Keywords: CCSD-CoCoSo, HLDBE, Humanitarian and business logistics experts, Humanitarian and Business Logistics Sustainability
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Open Access Original Article | |||
11. |
Predicting determinant factors and development strategy for tourist villages
, Pages: 137-148 Nafiah Ariyani, Akhmad Fauzi and Farhat Umar PDF (416 K) |
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Abstract: Tourist village program is one development priority program for rural development. Despite numerous opportunities to develop tourist villages such as the availability of natural resources and high demand for tourist villages recently, some challenges are still faced to develop tourist villages, especially in a developing country such as Indonesia. Governance problems, infrastructure, and effective partnership are among other factors that remain challenging in developing tourist villages. This study attempts to identify factors that determine the state of tourist villages in Indonesia and determine the appropriate strategies for better tourist village development. Using the case of tourist villages in Kedung Ombo, Central Java, a water based attractive tourist village, this study uses both machine learning and multicriteria approaches by means of Promethee in order to address the objective of the study. This study shows that government support, application of information technology, infrastructure, local participation, partnership, and attractive variations, are among the determinant factors that affect tourist village development. The study also reveals that the appropriate strategies for tourist village development include, improving infrastructure, institutional strengthening, and capacity building. This study could be used to assist local national as well as sub-national governments to effectively manage tourist villages in Indonesia. DOI: 10.5267/j.dsl.2022.9.003 Keywords: Determinant factors, Development strategies, Machine learning, Multicriteria, Promethee, Tourist village
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Open Access Original Article | |||
12. |
The relationship between economic growth and e-commerce at the beginning of covid-19 pandemic in east Java
, Pages: 149-162 Restu Arisanti, Efrilla Rita Utami, Agus Muslim and Ma’rufah Hayati PDF (416 K) |
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Abstract: The purpose of this study is to analyse the simultaneous spatial relationship between economic growth and e-commerce as well as the spillover effect between the two variables in East Java at the beginning of the Covid-19 pandemic in 2020. To answer the research objectives, spatial simultaneous modeling is used with the Spatial Autoregressive Generalized Spatial Three Model. Stage Least Square (SAR-GS3SLS) using rook contiguity. Based on the results of the SAR-GS3SLS, it can be concluded that at the beginning of the Covid-19 pandemic in 2020 in East Java, economic growth and e-commerce were simultaneously spatially interconnected. Variables that affect East Java's economic growth are e-commerce activities, the number of villages that have Base Transceiver Stations (BTS) and the spatial lag of economic growth (ρ1) while the open unemployment rate (TPT) and the Gini ratio have no significant effect on growth. economy. Variables that affect e-commerce are economic growth, internet banking users, percentage of population who have cellphones, number of millennials, number of villages that have ATMs and spatial lag of e-commerce (ρ2) while the number of villages with 4G/LTE signals has no effect on e-commerce. commerce. Regencies/cities that provide the highest spillover of economic growth and e-commerce in East Java are Malang, Mojokerto and Madiun Regencies. The three districts were able to provide a positive net spillover. DOI: 10.5267/j.dsl.2022.9.002 Keywords: E-Commerce, Simultaneous Spatial Sar-Gs3sls, Spillover Effect
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