• Journal of the Institute of Electronics Engineers of Korea CI
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• v.41 no.2
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• pp.33-42
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• 2004

Controlling household devices using an infra-ray (IR) has a limitation since the IR signal cannot only be extended, but also cannot be transmitted over the physical barrier. Using a radio frequency (RF) may overcome these shortcomings. Bluetooth is one of the emerging RF_based standard protocols for short-range wireless communications among various control devices. In this paper, we describe a control system for household appliances using Bluetooth under embedded Linux environment. The control system consists of a centralized main controller and geographically scattered wallplates. Some of the challenges and lessons learned will be outlined in the presentation. As a result of this research, we found that the Bluetooth is a promising technology for realizing wireless control systems for household appliances.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.5
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• pp.58-69
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• 2014

To cope with sever accident like Fukushima accident, the emergency response system is needed. It consist of the hardened I&C system and the mobile control station. The hardened I&C system monitors the state in the nuclear power plant and controls the emergency equipment such as valves, pumps and the mobile control station placed at 30km away from nuclear power plant receives the status information from the hardened I&C system and transmits the control data to the hardened I&C system. In this paper, we design the emergency communication system connecting the hardened I&C system to the mobile control station and analyze the performance of the system. This system consists of the terrestrial communication system and the satellite communication. The performance such as a communication link budget, throughput and delay time is analyzed for each system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.7
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• pp.572-580
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• 2013

IEEE 802.15.4e is a prospective standard for low latency control application in industries. This paper proposes a framework to evaluate the closed loop IEEE 802.15.4e based WNCS performance. The framework consists of two models: closed loop control system model and network model. The network model focuses on the PHY parameters of wireless link and takes the channel parameters into consideration. The PHY model combining with MAC model gives the control system model the probability of packet loss in a super-frame. In addition, redundancy mechanism is considered in IEEE 802.15.4e to reduce to data frame loss probability. The simulation is implemented in Matlab, PHY model takes the channel parameters from empirical results. Hence our evaluation gives insight into behavior of WNCS in different environments and it provides us a tool to design wireless network to achieve a good performance for control system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.113-116
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• 2010

최근 차량 내부의 전자 제어장치에 대한 운전자의 편의성 및 안전성의 요구 수준이 높아지고 있으며 이러한 수요자의 요구를 만족시키기 위하여 자동차 업계에서도 첨단식 편의기능을 갖춘 자동차의 개발에 많은 초점을 모으고 있는 추세이다. 이에 대응해 차량 내부의 전자시스템 사이에 상호 통신을 위한 차량용 네트워크 기술도 빠르게 발전하고 있다. 특히 대용량 데이터를 고속으로 전송할 수 있도록 높은 대역폭을 제공하는 차량용 광 네트워크가 주목 받고 있으며 현재 일부 차량에 도입되어 양산되고 있는 추세이다. 이러한 기술적 변화에 맞춰서 본 연구에서는 차량용 광 통신 네트워크 표준인 "MOST"의 백본망을 구축하여 무선 이동 단말기 보드(MV Board)를 통해 MOST 광 네트워크에 연결되어 있는 여러 장치들에 대한 다양한 정보를 수신할 수 있고 MOST네트워크 동작 및 운영상태를 확인해 볼 수 있는 시스템을 구성하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.500-503
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• 2016

IT convergence with agriculture and livestock farming are expected to bring more efficiency and quality improvement in producing, distributing, consuming of agricultural products with the aid of information processing and autonomous control technologies of the IT area. In this paper, it is analyzed strategy item and consider the actualized IT convergence case for agriculture and livestock, namely Smart Farming and Smart livestock Farming as a solution to cope the presented problems. In addition, suggest to ICT standardization road map for future planning.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.849-852
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• 2008

Distributed Network Protocol은 Master와 Slave 개념을 적용한 이벤트 감시와 하나의 Master가 다중 Slave의 제어가 필요한 환경에서 유용하게 사용되고 있는 통신 Protocol이다. DNP는 현재 개방형 Protocol로 에너지와 관련된 산업계 분야에서 사실상의 표준으로 적용되어 사용되고 있다. 현재 상용화되고 있는 ASE2000과 DNP3의 분석을 토대로 Master와 Slave Station을 Simulation 하고 DNP3 Message를 Generate하여 Serial Port를 사용해 종단 간에 통신하는 DNP3 Call Simulator를 설계 및 구현하였다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.16 no.1
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• pp.147-156
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• 2017

This paper analyzes the performance limit of WAVE system for the platooning service requirements which is referred from the de facto standards. The performance of the packet error rate and mean delay as key parameters in the wireless communication systems should be satisfied to provide safety to the platooning vehicles. The test scenarios are conducted by considering the following vehicle groups: platooning vehicles, vehicles within a hop distance and vehicles within two hop distance( called hidden node vehicles). The models of packet error rate and delay deals with the topology of aforementioned vehicle groups, vehicle speed and communication range. The numerical results are obtained in terms of packet size, packet arrival rate and data transmission rate. Finally, this paper suggests the robust range of packet error rate and delay for the WAVE system to provide the platooning vehicle service.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.5
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• pp.1-8
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• 2013

This paper implements an integrated vehicle chassis system of ACC(Adaptive Cruise Control) and LKS(Lane Keeping System) based on OSEK OS to vehicle operating system and analyzes its performance through experiments. In recent years active safety and advanced driver assistance system has discussed to improve safety of vehicle. Among the rest, We integrate ACC that controls longitudinal velocity of vehicle and LKS that assists a vehicle in maintaing its driving lane, then implement integrated control system in vehicle. Implemented control system uses OSEK/VDX proposed standard, which is aiming at reusability and safety of software for vehicle and removal hardware dependence of application software. Redesigned control system based on OSEK OS, which is supported by OSEK/VDX, can manage real-time task, process interrupt and manage shared resource. We show by results performed EILS(ECU-In-the-Loop Simulation) that OSEK OS-based integrated controller of ACC and LKS is equivalent conventional integrated controller of ACC and LKS.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.213-217
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• 2008

In this paper, a new design method for IMC-PID that adds a phase scaling factor of system identifications to the standard IMC-PID controller as a control parameter is proposed. Based on analytically derived frequency properties such as gain, phase margin and maximum magnitude of sensitivity function, this tuning rule is an optimal control method determining the optimum values of controlling factors to minimize the cost function, integral error criterion of the step response in time domain, in the constraints of design parameters to guarantee qualified frequency design specifications. The proposed controller improves existing single-parameter design methods of IMC-PID in the inflexibility problem to be able to consider various design specifications. Its effectiveness is examined by a simulation example, where a comparison of the performances obtained with the proposed tuning rule and with other common tuning rules is shown.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.31 no.3
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• pp.341-351
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• 2021

Recently, user-driven privacy control technology, such as distributed ID management, has been gaining attention. However, the existing blockchain-based access control studies have not provided a sufficient level of privacy control method to users. This paper proposes a method that combines permissioned blockchain technology and a recent privacy control standard. To allow users to participate in privacy control, a token-based user access control service that conforms to the UMA2 standard was applied to the blockchain dApp. By combining the blockchain and UMA2, the proposed method provides a user-centered privacy control function that the existing blockchain could not provide. In addition, we solved the problem of privacy, security, and availability of entities, which are the disadvantages of UMA2.