• Journal of the Korea Society of Computer and Information
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• v.25 no.12
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• pp.195-202
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• 2020

The control system for the efficiency of resource utilization in sensor network environment based on object detection and environmental sensor requires active control function which based on sensor data acquisition and transmission functions and server's data analysis. Using active rule-based mobile agent middleware, this paper proposes a new distributed control framework that reduces the load of central sensor data server in sensor network environment by implementing remote data sensing and Zigbee-based communication with server and data analysis method of server. In addition, we implemented a power-saving system prototype using active rule-based distributed control methods that applied consumer's demand and environmental variables, and verified the validity of the proposed system through experiments and evaluations in the mobile agent middleware environment. The proposed system is a system framework that can efficiently autonomously control distributed objects in the sensor network environment, and it can be applied effectively to the development of demand response service based on optimal power control for the smart power system in the future.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.646-648
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• 2021

Sensors with wireless communication functions are essential for acquiring and transmitting spatio-temporal data that is not easily accessible in sensor network environments. However, these sensors lack adaptability to large amounts of sensing data processing or dynamic environments, resulting in over-consumption of power and network overhead. This paper proposes a mobile agent that can acquire, transmit, and process only the necessary data by applying thresholds, and presents methods for autonomous migration and communication processing of mobile agents.

• The KIPS Transactions:PartA
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• v.12A no.2 s.92
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• pp.161-170
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• 2005

Grid makes a virtual high-performance computing resource by connecting geographically distributed heterogeneous resources. Building access control system is an important factor In the grid environment In this paper, we design and implement a grid access control system based on Globus Toolkit, which is one of the popular grid middleware. Especially, to guarantee the site autonomy for resource provider, we use several environment configuration files. Moreover, we design and implement PGAM to produce more detail and diverse information to ease the development of value added services.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2675-2677
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• 2005

공기조화설비의 계장 및 유지관리시에 공사와 조정 등을 간편화하고 로컬 레벨의 표준화 및 시스템간의 상호운용성을 높이기 위하여 공기조화설비 제어 계통도를 지하층(8포인트)과 기준층(15포인트)으로 나누어 설계하고 이것을 개방형 프로토콜인 $L_{ON}W_{ORKS]$를 이용하여 제어네트워크를 구축하였다. 네트워크의 자 디바이스는 뉴런 C로 프로그램 하였으며, 네트워크의 통신은 통신전용 배선공사를 간소화하기 위하여 전력선 통신을 사용하였다. 연구 결과 $L_{ON}W_{ORKS]$ 프로토콜로 각 디바이스들의 자율분산제어가 가능하게 되었고 통신선의 길이와 회선수를 감소시킬 수 있었다.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2476-2478
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• 2001

본 논문은 유연하고 탄력적인 네트워크 구조를 제공하는 Jini를 기반으로 하는 이동 로봇 제어 시스템의 설계와 구현 방법을 제안한다. 기존의 tele-operation 시스템의 단방향 제어을 개선하여, 제안한 시스템에서는 양방향 제어가 가능하고 클라이언트 시스템과 로봇이 상호 연동할 수 있는 구조를 가진다. 기존의 tele-operation 시스템에 Jini 기술을 도입하여 네트워크상에서 자원 이동이 간편하고 분산 컴퓨팅이 가능한 시스템을 제안하고자 한다. 본 논문은 구체적으로 복수의 작업장 사이에서 자율 이동이 가능하고 새로운 작업장의 네트워크에 자동으로 적응할 수 있는 이동 로봇시스템과 이러한 로봇 시스템과 연결될 수 네트워크 시스템을 제안한다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.1 no.2
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• pp.7-11
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• 2008

In order to enhance standardization and interoperability of local level systems, AHU control network was designed with basement(8 point) and basis story(15 point) and then the network was constructed by power line communication. Each devices of AHU system were programed with neuron C of $L_{ON}W_{ORKS}$ as an open protocol. As a result of a study, each devices of the network were controlled with self dispersion process by $L_{ON}W_{ORKS}$ protocol and wiring could be reduced by power line communication.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.1531-1535
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• 2008

The Tester of Autonomous station control system is a system which can test the main function of Autonomous station control system through the data field. The purpose of this paper is to meet the system requirements and design a main function, menu and user interface using Use-case. The main function is a time-deadline test, a schedule broadcast test, a route control test and a version-up test, etc. The design of Autonomous station control system tester plays a primary role of the important document for the upcoming future system development of the tester.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.5
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• pp.835-844
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• 2021

In this paper, a power facility communication control device was designed to autonomously determine and separate the fault section through communication between power facilities in the smart grid distribution system. In the power facility communication control device, the control module was designed as a DSP to measure three-phase voltage and current, and the communication module was designed as an embedded-based Raspberry Pi to determine the fault section and realize the fault section separation through communication between power facilities. Communication between DSP and Raspberry Pi was designed by SPI communication, and communication between Raspberry Pi was designed based on Wi-Fi. Finally, a performance evaluation system based on three power facility communication control devices was built, and simulation verification was conducted for various fault events that may occur on the distribution line. As a result of the test evaluation, it was possible to confirm the effectiveness of the design methodology of the communication control device by showing the required response of the communication control device to all test cases.

• Journal of Advanced Navigation Technology
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• v.26 no.4
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• pp.226-234
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• 2022

With advances in autonomous vehicles and networked control, there is a growing interest in the consensus control of a multi-agents system to control multi-agents with distributed control beyond the control of a single agent. Since consensus control is a distributed control, it is bound to have delay in a practical system. In addition, it is often difficult to have a very accurate mathematical model for a system. Even though a reinforcement learning (RL) method was developed to deal with these issues, it often experiences slow convergence in the presence of large uncertainties. Thus, we propose a slide RL which combines the sliding mode control with RL to be robust to the uncertainties. The structure of a sliding mode control is introduced to the action in RL while an auxiliary sliding variable is included in the state information. Numerical simulation results show that the slide RL provides comparable performance to the model-based consensus control in the presence of unknown time-varying delay and disturbance while outperforming existing state-of-the-art RL-based consensus algorithms.

• Journal of KIISE:Computing Practices and Letters
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• v.5 no.5
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• pp.574-582
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• 1999

Computer Supported Cooperative Work(CSCW) systems for cooperaton in distributed computing environment are used in many fields such as on-line approval, co-authoring, co-decision making, and so on. There have been many researches on co-drawing tools of the CSCW system, because they can be used in communication, co-design, and education. However, the existing tools are not flexible in system architecture and concurrency control. In this paper, we present "autonomous object," which includes concurrency control policy and information about its view. And we developed a new CSCW system with flexible system architecture.