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Game Theoretical Models of the Cooperative Carrier Behavior
이향숙,Maria Boile,Sotirios Theofanis,추상호 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5
This paper presents a multi-level modeling approach which captures the cooperative behavior of carriers in maritime freighttransportation networks. Ocean carriers, land carriers and port terminal operators are considered. Port terminal operators are regardedas a special type of carrier for modeling purposes. Ocean carriers are the leaders in a maritime shipping market. Port terminaloperators are the followers of ocean carriers as well as the leaders of land carriers. For cooperating ocean and land carriers,compensation principle is used to find the optimal service charge and routing pattern that maximize their total profit, while portterminal operators act competitively. The concept of Stackelberg game is applied to a multi-level game, assuming a single oceanshipping company (leader) through an alliance. Subsequently, the paper considers cooperation between ocean carriers and portterminal operators, while individual carriers within the same group are considered to act competitively. Cooperative games within thesame carrier group and between different groups of carriers are examined and compared with competitive games. A numericalexample is presented to demonstrate the validity of the developed model.
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Designing an Integrated Logistics Network in a Supply Chain System
이향숙,Ti Zhang,Maria Boile,Sotiris Theofanis,추상호 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.4
Many companies spend significant amounts of money and time on reverse logistics which mainly deal with transporting and handling returned products. Therefore, efficient management of return products is an urgent and interesting issue facing the companies. This paper presents a facility location problem of the integrated logistics network aiming to improve the efficiency of both forward and reverse logistics. Three types of facilities are identified: Warehouses (forward logistics), collection centers (reverse logistics) and hybrid facilities (both forward and reverse logistics). Instead of the traditional static problem, the paper proposes a nonlinear mixed integer model addressing the dynamic integrated forward and reverse distribution network design problem for 3PLs (Third Party Logistics Providers). A bi-objective model is developed to minimize the total shipping cost and time simultaneously. An example is tested to evaluate the model.
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The Risk Factors for Musculoskeletal Symptoms During Work From Home Due to the Covid-19 Pandemic
Nasri Sjahrul Meizar,Susilowati Indri Hapsari,Hasiholan Bonardo Prayogo,Sitanggang Akbar Nugroho,Gede Jyotidiwy Ida Ayu,Satria Nurrachmat,Theofany Simanjuntak Magda Sabrina 한국산업안전보건공단 산업안전보건연구원 2023 Safety and health at work Vol.14 No.1
Background: Online teaching and learning extend the duration of using gadgets such as mobile phones and tablets. A prolonged usage of these gadgets in a static position can lead to musculoskeletal disorders (MSD). Therefore, this study aims to identify the risk factors related to musculoskeletal symptoms while using gadgets during work from home due to the COVID-19 pandemic. Method: A cross-sectional survey with online-based questionnaires was collected from the University of Indonesia, consisting of lecturers, students, and managerial staff. The minimum number of respondents was 1,080 and was defined by stratified random sampling. Furthermore, the dependent variable was musculoskeletal symptoms, while the independent were age, gender, job position, duration, activity when using gadgets, and how to hold them. Result: Most of the respondents had mobile phones but only 16% had tablets. Furthermore, about 56.7% have used a mobile phone for more than 10 years, while about 89.7% have used a tablet for less than 10 years. A multivariate analysis found factors that were significantly associated with MSD symptoms while using a mobile phone, such as age, gender, web browsing activity, work, or college activities. These activities include doing assignments and holding the phone with two hands with two thumbs actively operating. The factors that were significantly associated with MSD symptoms when using tablets were gender, academic position, social media activity, and placing the tablet on a table with two actively working index fingers. Conclusion: Therefore, from the results of this study it is necessary to have WFH and e-learning policies to reduce MSD symptoms and enhance productivity at work.
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