Myung-Gon Yoon

Publications

4 Robust Stabilization against Unknown Consensus Network

Authors: Tae Kwon Ha, Jung-Ho Moon, Myung-Gon Yoon

Abstract:

This paper studies a robust stabilization problem of a single agent in a multi-agent consensus system composed of identical agents, when the network topology of the system is completely unknown. It is shown that the transfer function of an agent in a consensus system can be described as a multiplicative perturbation of the isolated agent transfer function in frequency domain. From an existing robust stabilization result, we present sufficient conditions for a robust stabilization of an agent against unknown network topology.

Keywords: Robust Stabilization, multi-agent system, transfer function

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3 Microstructure and High Temperature Deformation Behavior of Cast 310S Alloy

Authors: Tae Kwon Ha, Jung-Ho Moon, Myung-Gon Yoon

Abstract:

High temperature deformation behavior of cast 310S stainless steel has been investigated in this study by performing tensile and compression tests at temperatures from 900 to 1200oC. Rectangular ingots of which the dimensions were 350×350×100 in millimeter were cast using vacuum induction melting. Phase equilibrium was calculated using the FactSage®, thermodynamic software and database. Thermal expansion coefficient was also measured on the ingot in the temperature range from room temperature to 1200oC. Tensile strength of cast 310S stainless steel was 9 MPa at 1200oC, which is a little higher than that of a wrought 310S. With temperature decreased, tensile strength increased rapidly and reached up to 72 MPa at 900oC. Elongation also increased with temperature decreased. Microstructure observation revealed that s phase was precipitated along the grain boundary and within the matrix over 1200oC, which is detrimental to high temperature elongation.

Keywords: Microstructure, High temperature deformation, Mechanical Properties, stainless steel, STS 310S

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2 A Wireless Sensor Network Protocol for a Car Parking Space Monitoring System

Authors: Tae Kwon Ha, Jung-Ho Moon, Myung-Gon Yoon

Abstract:

This paper presents a wireless sensor network protocol for a car parking monitoring system. A wireless sensor network for the purpose is composed of multiple sensor nodes, a sink node, a gateway, and a server. Each of the sensor nodes is equipped with a 3-axis AMR sensor and deployed in the center of a parking space. The sensor node reads its sensor values periodically and transmits the data to the sink node if the current and immediate past sensor values show a difference exceeding a threshold value. The operations of the sink and sensor nodes are described in detail along with flow diagrams. The protocol allows a low-duty cycle operation of the sensor nodes and a flexible adjustment of the threshold value used by the sensor nodes.

Keywords: Wireless Sensor Network, Network Protocol, car parking monitoring, sensor node

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1 Broadcasting Stabilization for Dynamical Multi-Agent Systems

Authors: Tae Kwon Ha, Jung-Ho Moon, Myung-Gon Yoon

Abstract:

This paper deals with a stabilization problem for multi-agent systems, when all agents in a multi-agent system receive the same broadcasting control signal and the controller can measure not each agent output but the sum of all agent outputs. It is analytically shown that when the sum of all agent outputs is bounded with a certain broadcasting controller for a given reference, each agent output is separately bounded: stabilization of the sum of agent outputs always results in the stability of every agent output. A numerical example is presented to illustrate our theoretic findings in this paper.

Keywords: multi-agent system, broadcasting control, Transfer Function

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Abstracts

4 Broadcasting Stabilization for Dynamical Multi-Agent Systems

Authors: Tae Kwon Ha, Jung-Ho Moon, Myung-Gon Yoon

Abstract:

This paper deals with a stabilization problem for multi-agent systems, when all agents in a multi-agent system receive the same broadcasting control signal and the controller can measure not each agent output but the sum of all agent outputs. It is analytically shown that when the sum of all agent outputs is bounded with a certain broadcasting controller for a given reference, each agent output is separately bounded:stabilization of the sum of agent outputs always results in the stability of every agent output. A numerical example is presented to illustrate our theoretic findings in this paper.

Keywords: Stabilization, multi-agent system, transfer function, broadcasting control

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3 A Wireless Sensor Network Protocol for a Car Parking Space Monitoring System

Authors: Tae Kwon Ha, Jung-Ho Moon, Myung-Gon Yoon

Abstract:

This paper presents a wireless sensor network protocol for a car parking monitoring system. A wireless sensor network for the purpose is composed of multiple sensor nodes, a sink node, a gateway, and a server. Each of the sensor nodes is equipped with a 3-axis AMR sensor and deployed in the center of a parking space. The sensor node reads its sensor values periodically and transmits the data to the sink node if the current and immediate past sensor values show a difference exceeding a threshold value. The operations of the sink and sensor nodes are described in detail along with flow diagrams. The protocol allows a low-duty cycle operation of the sensor nodes and a flexible adjustment of the threshold value used by the sensor nodes.

Keywords: Wireless Sensor Network, Network Protocol, car parking monitoring, sensor node

Procedia PDF Downloads 301
2 Microstructure and High Temperature Deformation Behavior of Cast 310S Alloy

Authors: Tae Kwon Ha, Jung-Ho Moon, Myung-Gon Yoon

Abstract:

High temperature deformation behavior of cast 310S stainless steel has been investigated in this study by performing tensile and compression tests at temperatures from 900 to 1200°C. Rectangular ingots of which the dimensions were 350×350×100 in millimeter were cast using vacuum induction melting. Phase equilibrium was calculated using the FactSage®, thermodynamic software and database. Thermal expansion coefficient was also measured on the ingot in the temperature range from room temperature to 1200°C. Tensile strength of cast 310S stainless steel was 9 MPa at 1200°C, which is a little higher than that of a wrought 310S. With temperature decreased, tensile strength increased rapidly and reached up to 72 MPa at 900°C. Elongation also increased with temperature decreased. Microstructure observation revealed that σ phase was precipitated along the grain boundary and within the matrix over 1200°C, which is detrimental to high temperature elongation.

Keywords: Microstructure, High temperature deformation, Mechanical Properties, stainless steel, STS 310S

Procedia PDF Downloads 170
1 Robust Stabilization against Unknown Consensus Network

Authors: Tae Kwon Ha, Jung-Ho Moon, Myung-Gon Yoon

Abstract:

This paper considers a robust stabilization problem of a single agent in a multi-agent consensus system composed of identical agents, when the network topology of the system is completely unknown. It is shown that the transfer function of an agent in a consensus system can be described as a multiplicative perturbation of the isolated agent transfer function in frequency domain. Applying known robust stabilization results, we present sufficient conditions for a robust stabilization of an agent against unknown network topology.

Keywords: multi-agent system, transfer function, single agent control, graph angle

Procedia PDF Downloads 260