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컨테이너 크레인이 위치제어 및 흔들림 억제를 위한 GA-퍼지 제어기 설계
허동렬,오경근,김창현,안병철,정형환 동아대학교 정보기술연구소 2000 情報通信硏究所論文誌 Vol.8 No.1
In this paper, we design a GA-fuzzy controller for position control and anti-swing at the destination point. Applied genetic algorithm is used to complement the demerit such as the difficulty of the component selection of fuzzy controller, namely, scaling factor, membership function and control rules. Lagrange equation is used to represent the motion equation of trolley and load in order to obtain mathematical modelling. Simulation results show that the proposed control technique is superior to a conventional optimal control in destination point moving and modification.
A Fair Scalable Inter-Domain TCP Marker for Multiple Domain DiffServ Networks
Kyeong Hur,엄두섭 한국통신학회 2008 Journal of communications and networks Vol.10 No.3
The differentiated services (DiffServ) is proposed to provide packet level service differentiations in a scalable manner. To provide an end-to-end service differentiation to users having a connection over multiple domains, as well as a flow marker, an intermediate marker is necessary at the edge routers, and it should not be operated at a flow level due to a scalability problem. Due to this operation requirement, the intermediate marker has a fairness problem among the transmission control protocol (TCP) flows since TCP flows have intrinsically unfair throughputs due to the TCP’s congestion control algorithm. Moreover, it is very difficult to resolve this problem without individual flow state information such as round trip time (RTT) and sending rate of each flow. In this paper, to resolve this TCP fairness problem of an intermediate marker, we propose a fair scalable marker (FSM) as an intermediate marker which works with a source flow three color marker (sf-TCM) operating as a host source marker. The proposed fair scalable marker improves the fairness among the TCP flows with different RTTs without per-flow management. Through the simulations, we show that the FSM can improve TCP fairness as well as link utilization in multiple domain DiffServ networks.
Hur Kyeong 경인교육대학교 교육연구원 2020 The Journal of Education Vol.3 No.2
In this paper, a practical curriculum for using cloud software (SW) is proposed that can be applied as a subject for strengthening the untact education capability of field teachers. For untact education, teachers require content creation and online collaboration skills. Content creation forms are divided into real-time and video contents. Cloud-based SW can be used for online collaboration education. Currently, cloud-based Google and Chrome SW can be used to create real-time and video contents. In addition, online collaboration training can be conducted using cloud-based Chrome SW. Most cloud SW is fundamentally free to use; therefore, they can be shared with students to conduct classes. In this study, we focused on cloud-based SW running on the Chrome web browser and SW provided by the Google platform. In addition, among other free SW programs, the SW essential for untact distance education was investigated. Based on these results, according to the ADDIE model, a training curriculum for using cloud SW that can be taught for 15 weeks was proposed. In addition, detailed educational contents for each week corresponding to the content production and cloud collaboration capabilities were presented, and the curriculum evaluation results by field teachers were collected to analyze the curriculum validity.
Development of a Physical Computing SW based on Computational Thinking
Hur Kyeong 경인교육대학교 교육연구원 2019 The Journal of Education Vol.2 No.1
In physical computing, the input, processing, and output results of digital and analog sensors included in Arduino are different from the conventional programming, so that it is possible to correct programming errors quickly and improve the learning interest and satisfaction of the learners. However, there is a lack of physical computing SW (Software) development examples based on a computational thinking model for elementary and secondary school students. In this paper, we propose an example of SW development required for physical computing with Arduino MIMO (Multiple Input/Multiple Output) systems. This SW was developed in accordance with predefined SW-making steps in a CT (Computational Thinking) model. We used s4a (Scratch for Arduino) 1.5 software by considering elementary and secondary students. This proposal can be applied to various physical computing education classes to enhance the understanding of CT processes.
Kyeong Hur,Won-Sung Sohn,Kil Young Kwon 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.3
In this paper, we propose a multi-hop N-screen traffic mechanism, by using a coordinated resource allocation and an N-screen multi-hop DRP Information Element, in wearable health-monitoring systems (WHMS) networks. The proposed scheme can improve multi-hop throughput performance of WHMS Vital Video (WVV) applications. Also, proposed scheme can reduce WVV link establishment time since it minimizes the multi-hop WVV data delivery process. Compared with the legacy WHMS system, the proposed multi-hop N-screen traffic mechanism is very simple and efficient as it does not require additional wireless bio-channel information. These merits make the proposed multi-hop WHMS system extremely inexpensive to implement in hospital WHMS networks and bio-cloud computing applications.
A Fair Scalable Inter-Domain TCP Marker for Multiple Domain DiffServ Networks
Hur, Kyeong,Eom, Doo-Seop The Korea Institute of Information and Commucation 2008 Journal of communications and networks Vol.10 No.3
The differentiated services (DiffServ) is proposed to provide packet level service differentiations in a scalable manner. To provide an end-to-end service differentiation to users having a connection over multiple domains, as well as a flow marker, an intermediate marker is necessary at the edge routers, and it should not be operated at a flow level due to a scalability problem. Due to this operation requirement, the intermediate marker has a fairness problem among the transmission control protocol (TCP) flows since TCP flows have intrinsically unfair throughputs due to the TCP's congestion control algorithm. Moreover, it is very difficult to resolve this problem without individual flow state information such as round trip time (RTT) and sending rate of each flow. In this paper, to resolve this TCP fairness problem of an intermediate marker, we propose a fair scalable marker (FSM) as an intermediate marker which works with a source flow three color marker (sf-TCM) operating as a host source marker. The proposed fair scalable marker improves the fairness among the TCP flows with different RTTs without per-flow management. Through the simulations, we show that the FSM can improve TCP fairness as well as link utilization in multiple domain DiffServ networks.