• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1767-1770
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• 2003

This paper proposes an efficient network architecture for reflective memory system (RMS). Using this architecture, the time for broadcasting a shared-data to all nodes can be significantly shortened. The device named topology conversion switch (TCS) is implemented to realize the network architecture. The implemented TCS is applied to the ethernet based real time control network (ERCnet) to evaluate the performance.

• 대한전기학회논문지:시스템및제어부문D
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• 제54권6호
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• pp.403-408
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• 2005

As the increasing integrity of VLSI, the BIST(Built-In Self Test) is used as an effective method to test chips. Generally the pseudo-random test pattern generation is used for BIST. But it requires too many test patterns when there exist random This paper proposes and presents a new efficient network architecture for Reflective Memory System (RMS). A time to copy shared-data among nodes effects critically on the entire performance of the RMS. In this paper, the recent researches about the RMS are investigated and compared. The device named Topology Conversion Switch(TCS) is introduced to realize the proposed network architecture. One of the RMS based industrial control networks, Ethernet based Real-time Control Network (ERCnet), is adopted to evaluate the performance of the proposed network architecture for RMS.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1697-1698
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• 2008

PLS(Pohang Light Source) is 2.5 Gev synchrotron radiation source in Pohang, Korea, which is under operation since 1995. The hardware and software of the old BPM(Beam Position Monitor) data acquisition system for the PLS storage ring was completely upgraded to increase its performance and stability. The new BPM data acquisition system is based on VME-based EPICS (Experimental Physics and Instrument Control System) IOC system. We used 16-bit resolution analog-to-digital conversion board to digitize analog BPM signals. We developed a data average software to average raw BPM data using reflective memory board. We also developed device drivers for VME I/O boards used, IOC database for PV's(Process Variables). The new BPM data acquisition system is currently running for routine operation with good performance and stability. In this paper, we present the hardware and software of the new BPM data acquisition system DTL water skid cooling system and Resonant Control Cooling.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.334-337
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• 2005

This paper describes the implementation of DCS communication network that provides high bandwidth and reliability. The network for DCS in this paper adopts the Reflective Memory (RM) architecture and Fast Ethernet physical media that have 100Mbps bandwidth. Also, this network uses Ring Enhancement Device (RED) which was invented to reduce the time delay of each node. The DCS network that is introduced in this paper is named as ERCNet(Ethernet based Real-time Control Network). This paper describes the architecture and working algorithms of ERCNet and performs numerical analysis. In addition, the performance of ERCNet is evaluated by experiment using the developed ERCNet network.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.37-40
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• 2004

Electrochromic displays offer the possibility of providing high brightness in reflective mode due to the fact that no polarization of the incident or reflected light is required. The use of appropriately roughened reflective layers can enable the diffuse or Lambertian reflection of light. truly imitating the optical nature of paper as a reading medium. Furthermore, the use of an electrochromic system, essentially an electrochemical device, allows for the integration of charge storage layers, endowing such devices with an on-state memory and associated low power consumption. In this paper we describe the $NanoChromics^{TM}$ system and overview the several strategies employed towards the migration of this technology to flexible display formats.

• 재활간호학회지
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• 제14권2호
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• pp.118-128
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• 2011

Purpose: The purpose of this study was to explore the experiences of bereavement for main family members who had made and followed DNR decision for their family members. Method: This qualitative study was based on a grounded theory, and used in-depth interview techniques with the bereaved 10 main family members who had been treated and died under DNR order. Results: The causal condition of the family member was 'Releasing', and the main consequent phenomenon were 'Blaming self and ruminating'. The contextual condition was 'The memory of the deceased'. The action/reaction strategy was 'Purifying'. The intervening condition was 'Supporting system', and the consequence was 'Acceptance'. The experience after bereavement of the family member on DNR decision were rational processes that purified themselves and healed the guilt feeling about the decision from reflective assessment and response about DNR decision. Based on this results, the substantive theory 'Reflective self healing' was derived. Conclusion: The main family members in following DNR decision are more likely to have unhealthy emotional condition than others in normal bereavement process. But they overcame the grief of bereavement through reflective self healing process.

• 융합정보논문지
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• 제10권12호
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• pp.22-30
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• 2020

정보통신기술의 발전에 따라 DDoS와 DRDoS은 지속적으로 보안상 이슈가 되고, 고도화된 기법으로 점차 발전하고 있다. 최근에는 정상 서버의 프로토콜을 이용하여 반사 서버로 악용하는 DRDoS 기법으로 IT 기업들을 위협하고 있다. 반사 트래픽은 정상적인 서버에서 발생되는 트래픽으로 보안장비에서 판별하기가 어렵고 실제 사례에서도 최대 Tbps 까지 증폭되었다. 본 논문에서는 DRDoS 공격에서 사용되는 DNS증폭과 Memcached증폭을 비교 분석한 뒤 공격의 효과를 감소시킬 수 있는 대응방안을 제안한다. 반사 트래픽으로 사용되는 프로토콜은 TCP와 UDP, 그리고 NTP, DNS, Memcached등이 존재한다. 반사 트래픽으로 이용되는 프로토콜 중에서 반사 트래픽의 응답크기가 높은 DNS 프로토콜과 Memcached 프로토콜을 비교분석결과, Memcached 프로토콜은 DNS 프로토콜보다 ±21% 증폭된다. 대응방안은 Memcached 프로토콜의 메모리 초기화 명령어를 사용하여 공격의 효과를 감소시킬 수 있다. 향후 연구에서는 보안에 취약한 다양한 서버들을 보안 네트워크를 통해 공유하여 원천적 차단효과를 전망할 수 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2230-2234
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• 2003

This paper proposes a distributed simulator for general control system in CEMTool. Systems can be described by SIMTool likes the simulink in Matlab. For distributed simulation, we can seperate any system into several parallel subsystems in SIMTool. The number of parallel subsystem can be determined by the system's property. After seperation, parallel simulator will do initialization, one-step-ahead simulation, block-distribution and ordering and so on. Finally, simulator will create independent C codes and executive files for each subsystem. The whole system is fulfilled by several PCs, and each PC executes one subsystem. There are communications among these subsystem using reflective memory or ethernet. We have made several experiments, and the 5-stand cold rolling mill control system is our main target. The result of parallel simulation has shown effective speedup in comparison with one pc simulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 D
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• pp.2591-2593
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• 2003

본 논문에서는 CEMTool환경에서 수행된는 일반적 형태 분산 시뮬레이터의 구조를 제안한다. 먼저, 분산시뮬레이션을 할 수 있도록 SIMTool에서 전체 시스템을 패럴랠블록의 형식으로 여러개의 서브시스템으로 분할한다. 그런후에 CEMTool환경에서 분할된 시스템에 대하여 초기화, one step ahead 시뮬레이션, distribute와 ordering의 과정을 진행한 후 각각의 서브시스템에 대하여 독립적인 C code과 실행파일을 생성한다. 여러 대의 PC에서는 분할된 각각의 서브시스템을 독자적으로 실행시키는 동시에 서로간에 reflective memory를 통해 데이터를 주고반는다. 본 논문의 실험대상인 냉간압연 시스템은 각각의 서브시스템 내부의 계산량이 통신량보다 훨씬 많기 때문에 분산처리를 하기에 아주 적합하며, 본 논문에서는 냉간압연 시스템에 대한 분산시뮬레이션의 결과를 분석하고 제시된 방법으로 확실한 속도향상의 결과를 보여준다는 것을 설명하고자 한다.

• 한국전기전자재료학회논문지
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• 제22권2호
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• pp.169-173
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• 2009

We studied driving characteristics according to the ratio of mass and charging (m/q) value for charged toner particles with black and yellow color in charged particle type display panel. After biasing rectangle pulse to the transparency electrodes of putted panel with toner particles, its response time and contrast ratio are simultaneously measured using a laser as a optical source, photodiode as a detector and reflective system. As a results, contrast ratio is largest at the shortest response time region which is different to the particle because of m/q. We proposed relational equation for response time, m/q, cell gap and biasing voltage. It has not been studied and reported to analyze the relationship of response time, biasing voltage, lumping phenomena, cell gap, and contrast ratio for toner particle type display.