• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.33 no.5
• /
• pp.65-71
• /
• 2005

Pyro-shock measurement system in launch vehicle is necessary to validate structural robustness and to prepare environmental qualification criteria for launch vehicle systems. This paper describes design, development and function test of prototype pyro-shock recorder to be employed on KSLV-I in the near future. Due to the limitation of telemetry transmission rate, pyro-shock recorder acquires and stores the shock sensor data with high sampling rate in short period and sends the data to the KSLV-I telemetry system with lower data rate. Signal conditioning in pyro-shock recorder is designed to enhance signal-to-noise ratio through proper placement of anti-aliasing filter.

• The Journal of Korean Association of Computer Education
• /
• v.3 no.1
• /
• pp.65-74
• /
• 2000

Based on recent fast development of computer and telecommunication technologies, the Distance Education System(DES) was introduced and utilized widely in the area of education. For an immediate and fluent communication between the teacher and the student under DES, the chatting subsystem was effectively used. However, the current chatting systems are not able to receive and transmit the mathematical symbols despite their indispensability in the process of problem and solution setting under remote mathematical education. In this study, thus, Equation Chatting System that can receive and send the mathematical symbols under the graphical user interface was designed and implemented.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• v.9 no.1
• /
• pp.122-125
• /
• 2005

Data collection system is now widely used. This system is divided by embedded system and communication module. And data collection system in the remote area is using Satellite communication. So, data collection system is complicated and expensive. This paper proposes stabilization and cheapness of remote data collection system in dusty. The system can be composed simply through third party Satellite Communication programming of terminal including embedded system. Finally, collected data is transmitted to multi-user through web agent.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2001.06a
• /
• pp.208-211
• /
• 2001

최근 병원에서의 전산화가 급속도로 이루어지고 있는 가운데 각종 병리 영상을 이용한 원격 병리 진단 시스템의 필요성이 높아지고 있다. 본 논문에서는 병리분석을 위해 병리 영상을 인터넷 환경에서 Component기반으로 진단 보조하는 원격병리진단 시스템을 구현하였다. 서버의 부하를 줄이기 위해서 병리 진단에 필요한 영상처리 영역은 Component 내에서 처리되도록 하였다. 서버에서는 database에 대한 접근과 처리된 영상의 전송/채팅을 담당하도록 하였다. 원거리에 있는 병리학자들이 병리 세포조직 영상으로 상호 의전교환 및 영상 송수신, 영상처리를 통해 정확한 병리 진단을 할 수 있도록 도와주는 본 시스템은 시간과 공간의 한계를 극복하여 병리학자들의 진단 효율성을 높이게 될 것으로 기대한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2003.04a
• /
• pp.839-842
• /
• 2003

인터넷의 발전은 사회적인 변화와 더불어 교육 현장에서도 많은 변화를 가져왔다. 특히 인터넷을 통한 화상 전송기술의 발달로 원격 교육에 대한 관심이 크게 대두되고 있다. 본 연구에서는 인터넷 화상채팅 기법을 적용한 원격 교육 시스템의 구축 가능성을 살펴 볼 것이다. 화상 채팅을 제공하는 사이트들의 시스템 분석을 통해 특성을 파악하고 인터넷 화상 채팅시스템의 수업적용 후 비교 분석을 통해 가장 효율적인 학습사이트를 찾아보며 접속자 수와 학습자 수준문제, 학습 방법, 학습 과목에 대한 결과 분석으로 인터넷 화상채팅기법을 통한 학습가능성을 제시하고자한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.10a
• /
• pp.253-255
• /
• 2004

컴퓨터를 활용한 원격교육은 컴퓨터의 발달과 인터넷의 고속화로 인하여 다양한 분야에서 시작하고 있다. 원격교육은 널리 활용되고 있지만 이에 대한 평가에서는 문제점을 지닌다. 부정행위의 감시와 문제의 오류에 대한 즉각적인 대처 둥의 문제점 때문에 원격으로 평가가 행해지지 못하고 현재 학교 등에서 행해지는 평가와 유사한 형태로 이루어지고 있다. 본 논문에서는 올바른 학생 평가를 위해서 현재 학생의 상태를 전송하고 교수는 학생의 상태에 따라서 부정행위 여부 등을 판단할 수 있으며 문제의 오류를 실시간으로 보정하여 문제의 공정성을 향상시킨 시스템을 제안한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2022.06a
• /
• pp.143-144
• /
• 2022

자율운항선박의 원격제어를 위해 선박으로부터 다양한 종류와 포맷의 데이터를 전송받아야 한다. 선체 주변환경을 파악하기 위해 CCTV 영상을, 선박의 운항상 태를 파악하기 위해 각종 센서 메시지를, 레이더신호를 전시하기 위한 레이더 신호 혹은 이미지 등의 데이터를 받아 육상제어 시스템에 전시하고, 사용자의 제어명령을 선박에 전달하기 위한 메시지 교환시스템을 개발하였다.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.50 no.9
• /
• pp.144-155
• /
• 2013

This paper presents a low-cost remote power-quality-failure monitoring system (RPMS) using Android App and TI MCU (micro-controller unit), which is appliable to a micro-grid. The designed RPMS testbed consists of smart nodes, a server, and Android APPs. Especially, the C2000-series MCU-based RPMS smart node that is low-cost compared to existing monitoring systems has both a signal processing function for power signal processing and a data transmission function for power-quality monitoring data transmission. The signal processing function implements both a wavelet-based power failure detection algorithm including sag, swell, and interruption, and a FFT-based power failure detection algorithm including harmonics such that reliable and real-time power quality monitoring is guaranteed. The data transmission function implements a low-complexity RPMS transmission protocol and defines a simple data format (msg_Diag) for power monitoring message transmission. We may watch the monitoring data in real time both at a server and Android phone Apps connected to the WiFi network (or WAN). We use RS-232 (or Bluetooth) as the wired (or wireless) communication media between a server and nodes. We program the RPMS power-quality-failure monitoring algorithm using C language in the CCS (Code Composer Studio) 3.3 environment.

• Journal of the Korean Vacuum Society
• /
• v.17 no.1
• /
• pp.58-66
• /
• 2008

The KSTAR Current Lead System(CLS) with network based real-time distributed control system is implemented using an EPICS as a middle-ware software. The current lead system transfers current from magnet power supplies to superconducting magnet system and simultaneously supply the coolant to maintain superconducting state. To control the CLS at main control room an EPICS IOC server is installed in local control area. Using this server, it is able to be controlled and monitored the system in main control room through operator interface(OPI) which uses "caget" to read status and "caput" to write command with a unique name called PV. The EPICS IOC is developed using "ether-ip" driver to communicate with PLC. Also we achieved satisfactory results in operation and stability aspects from a long period commissioning test.

• Journal of KIISE:Computing Practices and Letters
• /
• v.15 no.8
• /
• pp.525-533
• /
• 2009

Staging technique is used to provide files for a job in the Grid. If a staged file has large volume, the start time of the job is delayed and the throughput of job in the Grid may decrease. Therefore, removal of staging overhead helps the Grid operate more efficiently. In this paper, we present two methods for efficient file provisioning to clear the overhead. First, we propose RA-RFT, which extends RFT of Globus Toolkit and enables it to utilize RLS with replica information. RA-RFT can reduce file transfer time by doing partial transfer for each replica in parallel. Second, we suggest Remote Link that uses remote I/O instead of file transfer. Remote link is able to save storage of computational nodes and enables fast file provisioning via prefetching. Through various experiments, we argue that our two methods have an advantage over existing staging techniques.