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일반 전동차량 네트워크의 노드간 MASTER 전환 알고리즘 구현
연준상,양오 한국반도체디스플레이기술학회 2017 반도체디스플레이기술학회지 Vol.16 No.3
This paper presents the implementation for the master changing algorithm between nodes in a general electric vehicle. The packet processing method based on the unique network method of an electric vehicle is that the method of processing a communication packet has the priority from the node of a vehicle installed at both ends. An important factor in deciding master or slave in a train is that the request data, the status data, and transmits or control codes of sub-devices are controlled from the node which master becomes. If the request data or the status data is transmitted from the non- master side, it is very important that only one of the devices of both stages be master since the data of the request data may collide with each other. This paper proposes an algorithm to select master or slave depending on which vehicle is started first, which node is master or slave, and whether the vehicle key is operation. Finally experimental results show the stable performance and effectiveness of the proposed algorithm
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이더넷 통신을 이용한 전동차용 Network 시스템 구현
연준상,양오 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.19 No.1
In this paper, we implement an Electric Car network system using Ethernet developing rapidly. Recent Ethernet has spread widely with internet and technic for Ethernet also have develop Ethernet has the fastest speed among wire communications and has a long distance between segment compared with other wire communications In this paper, we implement the system that can tranmit and receive data in speed of 10Mbps and the system is consist of RTL8019AS compatible with NE2000. Also we use TCP/IP protocol proved in reliability in data communication Using TCP/IP protocol proved in reliability, full duplex structure is implemented so that the reliability in this system is higher Additionally in this system optical fiber is the system, we implement full duplex structure communicating through optical fiber with TCP/EP protocol These optical fiber have much higher reliability and enable to communicate in 1Gbps and to transmit data up to serveral tens Km with these advantage, optical fiber will be used widely in the future And in order to increase reliability, we used to depulication method of communication using Ethernet and TCP/IP protocol
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Flash disk와 Ethernet을 이용한 백업장치 개발에 관한 연구
연준상,양오 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.19 No.1
As a transmit-rate between devices and amount of data have been increased, the request of storage to backup these data is increasing. One of portable media, Flash disk is issued becuase of it's speed and reliability In the request to store data in realtime or to backup. So we propose the Flash disk which is formatted in FAT-16 compatible to DOS or Windows and files are stored to or deleted from. Also physical layer analyzes recievec packets through Ethernet by TCP/IP protocol and schedul backup As giving Flash disk the function to store or read data, the data backup can be processed in contoller.
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철도차량 수를 유연하게 구성할 수 있는 통신시스템 구현
연준상,양오 한국반도체디스플레이기술학회 2016 반도체디스플레이기술학회지 Vol.15 No.4
This paper presents the implementation for a network structure of railway cars using a point to point communication. Most of network’s representative specifications for a train are the FIP (Field Bus), MVB (Multifunction Vehicle Bus), CAN and WTB (Wire Train Bus) which is used by ALSOM, SIEMENS and BOMBADIER as major in this field. These networks in a physical layer use a multi-drop method, connected from 1st car to nth car of a train through a cable without any extra services such as an electric part, amplifier. However waveforms which is passed through a long cable in the multi-drop are distorted by a capacitance or resistance of the cable or environments. Also since using a cable connected directly from 1st car to nth car, if over two trains make double head, it isn’t easy to distinguish ID for each railway cars. So by using the point to point network per each car, it is able to reduce a distortion. Also since reducing distortion, this communication speed can be been higher and transmit and receive any packets more stably. Using proposed token in a packet, this can make ID per each railway car automatically. Finally experimental results show the good performance and effectiveness of the proposed method.
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자기진단 기능을 이용한 비동기용 불휘발성 메모리 모듈의 설계
양오,신우현,연준상 한국반도체디스플레이기술학회 2022 반도체디스플레이기술학회지 Vol.21 No.1
In this paper, an asynchronous nonvolatile memory module using a self-diagnosis function was designed. For the system to work, a lot of data must be input/output, and memory that can be stored is required. The volatile memory is fast, but data is erased without power, and the nonvolatile memory is slow, but data can be stored semi-permanently without power. The non-volatile static random-access memory is designed to solve these memory problems. However, the non-volatile static random-access memory is weak external noise or electrical shock, data can be some error. To solve these data errors, self-diagnosis algorithms were applied to non-volatile static random-access memory using error correction code, cyclic redundancy check 32 and data check sum to increase the reliability and accuracy of data retention. In addition, the possibility of application to an asynchronous non-volatile storage system requiring reliability was suggested.
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에러 보정 코드를 이용한 비동기용 대용량 메모리 모듈의 성능 향상
안재현,양오,연준상 한국반도체디스플레이기술학회 2020 반도체디스플레이기술학회지 Vol.19 No.3
NAND flash memory is a non-volatile memory that retains stored data even without power supply. Internal memory used as a data storage device and solid-state drive (SSD) is used in portable devices such as smartphones and digital cameras. However, NAND flash memory carries the risk of electric shock, which can cause errors during read/write operations, so use error correction codes to ensure reliability. It efficiently recovers bad block information, which is a defect in NAND flash memory. BBT (Bad Block Table) is configured to manage data to increase stability, and as a result of experimenting with the error correction code algorithm, the bit error rate per page unit of 4Mbytes memory was on average 0ppm, and 100ppm without error correction code. Through the error correction code algorithm, data stability and reliability can be improved.
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