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가상물리시스템 개념을 이용한 임베디드 제어 네트워크 시스템 설계에 관한 연구
박지훈,이석,이경창,Park, Jee-Hun,Lee, Suk,Lee, Kyung-Chang 대한임베디드공학회 2012 대한임베디드공학회논문지 Vol.7 No.5
Recent advances in electronics have enabled various conventional products to incorporate with numerous powerful microcontroller. Generally, an embedded system is a computer system designed for specific control functions within a larger system, often with real-time computing constraints. The growing performance and reliability of hardware components and the possibilities brought by various design method enabled implementing complex functions that improve the comport of the system's occupant as well as their safety. A cyber physical system (CPS) is a system featuring a tight combination of, and coordination between, the system's computational and physical elements. The concept of cyber physical system, including physical elements, cyber elements, and shared networks, has been introduced due to two general reasons: design flexibility and reliability. This paper presents a cyber physical system where system components are connected to a shared network, and control functions are divided into small tasks that are distributed over a number of embedded controllers with limited computing capacity. In order to demonstrate the effectiveness of cyber physical system, an unmanned forklift with autonomous obstacle avoidance ability is implemented and its performance is experimentally evaluated.
네트워크 기반 무인지게차를 위한 팔레트 자율적재기술의 개발
박지훈(Jee-Hun Park),김민환(Minhwan Kim),이석(Suk Lee),이경창(Kyung-Chang Lee) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.10
Unmanned autonomous forklifts have a great potential to enhance the productivity of material handling in various applications because these forklifts can pick up and deliver loads without an operator and any fixed guide. Especially, automation of pallet loading and unloading technique is useful for enhancing performance of logistics and reducing cost for automation system. There are, however, many technical difficulties in developing such forklifts including localization, map building, sensor fusion, control, and so on. This is because the system requires numerous sensors, actuators, and controllers that need to be connected with each other, and the number of connections grows very rapidly as the number of devices grows. This paper presents a vision sensor-based autonomous loading and unloading for network-based unmanned forklift where system components are connected to a shared CAN network. Functions such as image processing and control algorithm are divided into small tasks that are distributed over a number of microcontrollers with a limited computing capacity. And the experimental results show that proposed architecture can be an appropriate choice for autonomous loading in the unmanned forklift.
지능형 텔레메트릭스를 위한 IEEE 1451.2기반 스마트센서 개발
박지훈(Jee Hun Park),이경창(Kyung Chang Lee),이석(Suk Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
As vehicle become more intelligent for convenience and safety of drivers in ITS (Intelligent Transport System), the smart sensor and network device are essential components for intelligent vehicles. However, for wider application of smart modules, the following two problems should be overcome. Firstly, because it is very difficult that transducer manufacturers developed the smart module that supports all the existing network protocols, the smart module must be independent of the type of networking protocols. Secondly, mesh network based network module should be developed for intelligent telemetrics environments. To solve these problems, this paper investigates the feasibility of an IEEE 1451.2 based smart module. More specifically, a smart module for large network coverage has been developed using ZigBee.
박지훈(Park Ji-Hun),민경원(Min Kyung-Won),이루지(Lee Roo-Jee),최석주(Choi Seok-Joo),염성곤(Yum Sung-Kon) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Ground Vibration at Gil-dong in Seoul induced by the 5th line of Seoul Subway is predicted using various prediction methods and compared With measured Vibration Also, several Issues on the Improvement of prediction methods are discussed Furthermore, as an alternative vibration source, measured vibration acceleration level(VAL) on the tunnel wall of the Bundang line of Seoul Subway is applied to the prediction of the VAL at the location mentioned previously Then requirements accompanied to the suggestion of the new vibration source appropriate to the condition of Seoul Subway
박지훈 ( Park Ji-hun ),민경원 ( Min Kyung-won ),이루지 ( Lee Roo-jee ),최석주 ( Choi Seok-joo ),염성곤 ( Yum Sung-kon ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
Ground vibration at Gil-dong in Seoul induced by the 5th line of Seoul Subway is predicted using various prediction methods and compared with measured vibration. Also, several issues on the improvement of prediction methods are discussed. Furthermore, as an alternative vibration source, measured vibration acceleration level(VAL) on the tunnel wall of the Bundang line of Seoul Subway is applied to the prediction of the VAL at the location mentioned previously. Then requirements accompanied to the suggestion of the new vibration source appropriate to the condition of Seoul Subway.
FlexRay 프로토콜에서 플랫폼 구성 변수의 자동 생성에 관한 연구
양재성,박지훈,이석,이경창,최광호,Yang, Jae-Sung,Park, Jee-Hun,Lee, Suk,Lee, Kyung-Chang,Choi, GwangHo 대한임베디드공학회 2012 대한임베디드공학회논문지 Vol.7 No.1
Recently, FlexRay was developed to replace controller area network (CAN) protocol in chassis networking systems, to remedy the shortage of transmission capacity and unsatisfactory real-time transmission delay of conventional CAN. FlexRay network systems require correct synchronization and complex scheduling parameters. However, because platform configuration register (PCR) setting and message scheduling is complex and bothersome task, FlexRay is more difficult to implement in applications than CAN protocol. To assist a network designer for implementing FlexRay cluster, this paper presents an analysis of FlexRay platform configuration register and automatic generation program of PCR. To demonstrate the feasibility of the automatic generation program, we evaluated its performance using experimental testbed.
능동형 무인지게차 시스템을 위한 분산형 제어 네트워크 개발
송영훈(Young Hun Song),박지훈(Jee Hun Park),이상협(Sang Hyop Lee),이경창(Kyung Chang Lee),이석(Suk Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Recently, unmanned vehicle such as AGVs(Automatic Guided Vehicles), OHTs(Overhead Hoist Transfers) are widely used in logistic industrial system. This paper focuses on the feasibility of CAN based distributed control network for active unmanned forklift. An active unmanned forklift has many electronic control units(ECU) that link sensor with actuators to handle intelligent function. The increasing number of electronic control units, sensors, and actuators in active unmanned forklift, and the increasing need for more intelligent functions requires a network with increased capacity and real-time capability.