• Advances in robotics research
• /
• v.2 no.3
• /
• pp.247-257
• /
• 2018

Various studies have been performed to coordinate robots in transporting objects and different artificial intelligence algorithms have been considered in this field. In this paper, we investigate and solve Multi-Robot Transportation problem by using a combined auction algorithm. In this algorithm each robot, as an agent, can perform the auction and allocate tasks. This agent tries to clear the auction by studying different states to increase payoff function. The algorithm presented in this paper has been applied to a multi-robot system where robots are responsible for transporting objects. Using this algorithm, robots are able to improve their actions and decisions. To show the excellence of the proposed algorithm, its performance is compared with three heuristic algorithms by statistical simulation approach.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.22 no.3
• /
• pp.116-130
• /
• 2023

Expressways play pivotal roles in cargo transportation because of their superior accessibility and mobility compared to rail and air. On the other hand, there is a limit to the accurate calculation of cargo transportation performance using existing highways owing to the mixture of vehicle types and difficulty in identifying cargo loads of individual cargo vehicles. This paper presents an algorithm for calculating more reliable cargo transportation performance using big data. The traffic performance (veh·km/day) was derived using the data collected from Toll Collecting System. The average tolerance weight for each vehicle type and the cargo load unit (ton/unit) considering it was calculated using vehicle specification information data and high-speed and low-speed axis data. This study calculated the cargo transportation performance by section and type using various online integrated highway data and presented a method for calculating the transportation performance by linking open business offices and private highways.

• Journal of Digital Convergence
• /
• v.20 no.4
• /
• pp.63-72
• /
• 2022

The interest in online education has increased due to the spread of COVID-19. Especially, in the online environment, the importance of scaffolding, which refers to the help and support provided by instructors or peer learners, is being emphasized. This study aimed to review the antecedents of online scaffolding at the university of Korea through the method of systematic review. For this purpose, we collected 578 studies conducted from 2010 to 2021 and selected 7 studies according to the criteria of selection and exclusion. As a result, we found general features, types, and effects of online scaffolding at the university of Korea. Based on these results, we discussed suggestions and implications for a follow-up study. We hope many empirical kinds of research will be conducted about online scaffolding at the university.

• The Journal of the Korea Contents Association
• /
• v.21 no.12
• /
• pp.375-383
• /
• 2021

Due to COVID-19, people are building new lifestyles such as online shopping, online travel, and video conferencing by limiting going out and gatherings. Such rapid social change is causing new problems and deepening existing problems at the same time. In particular, as online consumption increases significantly, traffic congestion, air pollution, and the heavy workload of delivery drivers are deepening in the daily logistics industry, and face-to-face delivery is emerging as a new problem. With the advent of the 4th industrial revolution, unmanned delivery using drones, artificial intelligence, and autonomous driving is emerging as an alternative to the existing logistics industry. However, space for logistics facilities and securing additional logistics sites due to drone flight are emerging as new problems to be solved. Therefore, it is intended to link additional services such as logistics movement, storage, and delivery by utilizing the existing transportation business, the subway, as a space for a logistics facility for drones that can solve existing problems and new problems.

• International Journal of Internet, Broadcasting and Communication
• /
• v.13 no.4
• /
• pp.112-120
• /
• 2021

Recently, the number of consumers using digital online distribution platforms is increasing. This caused the rapid growth of the e-commerce market and increased delivery volume in urban areas. The logistics system, designed ar006Fund the city center to handle the delivery volume, operates a delivery system from the outskirts of the city to the urban area using cargo trucks. This maintains an ecosystem of high-cost and inefficient structures that increase social costs such as road traffic congestion and environmental problems. To solve this problem, research is being conducted worldwide to establish a high-efficiency urban joint logistics system using urban railway facilities and underground space infrastructure existing in existing cities. The joint logistics system begins with linking unmanned delivery automation services that link terminal delivery such as cargo classification and stacking, infrastructure construction that performs cargo transfer function by separating from passengers such as using cargo platform. To this end, it is necessary to apply the device to the vertical and horizontal transportation machine supporting the vertical transfer in the flat space of the joint logistics terminal, which is the base technology for transporting cargo using the transfer robot to the destination designated as a freight-only urban railway vehicle. Therefore, this paper aims to derive holistic viewpoints needs for design requirements for vertical and vertical transportation machines and freight transportation standard containers, which are underground railway logistics transport devices to be constructed by urban logistics ecosystem changes.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2022.05a
• /
• pp.402-405
• /
• 2022

The purpose of this study was to investigate the satisfaction of clinical practice for university students in the physical therapy department. 163 students participated in the study. The subjects completed an online survey that consisted of 36 clinical practice satisfaction questions and 5 questions of general characteristics. The collected data was analyzed by using frequency analysis, independent t-test, one-way ANOVA and Scheffe post hoc analyses with a significant level of 0.05. The students' satisfaction of clinical practice was 3.84 in average on a scale of 5. The students' satisfaction was the highest for the item 'Satisfaction after clinical practice', and the lowest for the item 'Internal conflict in clinical practice' and 'Evaluation of clinical practice'. The students' satisfaction of clinical practice showed significant differences according to the satisfaction of the major (p<.001), however, no significant difference according to gender, grade, training period and practice institution.

• Journal of Korean Society of Transportation
• /
• v.26 no.3
• /
• pp.31-40
• /
• 2008

There have been a lot of efforts to find more accurate evaluation methods for traffic signal control effectiveness for a long period of time. Nowadays a newly advanced method called HILSS, 'Hardware-in-the-Loop-Simulation System', is used to evaluate the overall traffic control's effectiveness including physical control environments like communication conditions, hardware performance, controller's mechanical operations and so on. In this study, an Online-HILSS model has been developed, which runs on CORSIM(5.0) micro traffic simulation model on-lined to COSMOS. For the verification of the model, three tests are performed as follows; (1) a comparison of TMC's timing plan with the simulated green interval, (2) as a case study, a delay distribution comparison of the online simulation with the CORSIM stand-alone simulation. The result of the first test shows that the model can run the simulation green interval by TMC's timing plan correctly. The result of second test shows that the online simulation of the model brings the same simulation results with the CORSIM offline simulation in case of the same timing plan. These results mean that the online evaluation model could be a reliable tool to measure a real-time signal control effectiveness of a wide area street network with the HILSS method.

• Journal of the Korea Safety Management & Science
• /
• v.15 no.4
• /
• pp.317-321
• /
• 2013

Due to growth of electronics and control devices, automation and situational awareness systems have been applied by automobile. Vision systems with the introduction of unmanned system were being actively developed. In this paper, the distortion in the 7-inch LCD screen for the treatment process are divided into Online and Offline processing. Offline processing based on the image signal processing and for generating LUT Online to Offline generated by processing the distortion is applied to the LUT. LUT is applied to distort the image processing in real time, so that distortion correction is made for the purpose of setting.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2021.01a
• /
• pp.81-83
• /
• 2021

현재 국내 많은 도서관과 여러 대여점 시설이 코로나로 인하여 운영에 제한이 있거나 중지되었다. 이에 기존 시설 이용자는 도서 대여에 불편함을 겪고 있으며, 민간 도서 대여점과 도서 대여업 산업 전반의 매출이 감소한 것을 확인하였다. 본 논문에서는 시설 사용자의 불편함과 민간 업체의 매출을 개선하기 위해 대여 서적 배달 서비스인 O2O(Offline to online) 플랫폼을 클라우드 서버에 구축하고자 한다. 플랫폼은 하이브리드 애플리케이션으로 구현하여 스마트 폰에 익숙한 신세대와 컴퓨터의 친숙한 기성세대 모두 쉽게 이용할 수 있게 구현하였으며, 이를 통해 대여점 이용자는 편리하고 안전하게 집에서 대여하고 대여점은 이용자 증가와 더불어 또 다른 홍보 수단으로 이용하여 대여점의 매출 개선을 기대할 수 있다.

• Proceedings of the KIEE Conference
• /
• 1999.07b
• /
• pp.677-679
• /
• 1999

This paper introduces a implementation of fault detection for national highway line 3. Fault detection system was installed and operated on national highway line 3, environmental elements caused by abnormal status or faults has often happened. Therefore, the function of fault detection system is to speedy notify fault site, cause as well as scale of fault to manager. Though the fault detection and diagnosis system has been imported in the field of process of water and electric power, it is just beginning step in the field of ITS(Intelligent Transportation Systems). In general, Maintenance system is performed the online/offline process of detection, diagnosis and measure. This paper is studied online detection process, which is realtime remote detection.