• Title/Summary/Keyword: 빠른 응답

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Analysis of Chemical Accident-Causing Substances Using a Proton Transfer Reaction-Time of Flight Mass Spectrometer (양자전이 비행시간 질량분석기를 이용한 화학사고 원인물질 분석)

  • Kim, So-Young
    • Fire Science and Engineering
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    • v.33 no.6
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    • pp.80-86
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    • 2019
  • In Korea, a total of 556 chemical accidents occurred from 2012 to 2018 caused by adverse reactions of two or more chemicals, which required significant amounts of time to identify the causative chemicals. Rapid analysis is required for effective incident response and probing. In this study, a quantum transition time-of-flight mass spectrometer was used to identify the causative agents of chemical accidents caused by adverse reactions. The analyzer enabled fast real-time analysis without the need for sample collection and pretreatment. Quantitative and qualitative analysis of most volatile organic compounds with high hydrogen affinity was performed to investigate the cause of the chemical accidents. In fact, in the month of 201◯, methanol and toluene were detected as causative agents of the accident using a quantum transition time mass spectrometer, and were also the cause of the reported odor.

Object Replication and Consistency Control Techniques of P2P Structures for Multiplayer Online Games (멀티플레이어 온라인 게임을 위한 P2P 구조의 객체 복제와 일관성 제어 기법)

  • Kim, Jinhwan
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.14 no.4
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    • pp.91-99
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    • 2014
  • The main game architectures for multiplayer online games are the traditional client-server architectures, multi-server architectures and P2P(peer-to-peer) architectures. P2P architectures, due to their distributed and collaborative nature, have low infrastructure costs and can achieve high scalability as well as fast response time by creating direct connections between players. However, P2P architectures face many challenges. Distributing a game among peers makes maintaining control over the game more complex. These architectures also tend to be vulnerable to churn and cheating. Providing consistency control in P2P systems is also more difficult since conflicting updates might be executed at different sites resulting in inconsistency. In order to avoid or correct inconsistencies, most multiplayer games use a primary-copy replication approach where any update to the object has to be first performed on the primary copy. This paper presents the primary-copy model with the update dissemination mechanism that provides consistency control over an object in P2P architectures for multiplayer online games. The performance for this model is evaluated through simulation experiments and analysis.

Implement of Hand Gesture Interface using Ratio and Size Variation of Gesture Clipping Region (제스쳐 클리핑 영역 비율과 크기 변화를 이용한 손-동작 인터페이스 구현)

  • Choi, Chang-Yur;Lee, Woo-Beom
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.13 no.1
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    • pp.121-127
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    • 2013
  • A vision based hand-gesture interface method for substituting a pointing device is proposed in this paper, which is used the ratio and size variation of Gesture Region. Proposed method uses the skin hue&saturation of the hand region from the HSI color model to extract the hand region effectively. This method can remove the non-hand region, and reduces the noise effect by the light source. Also, as the computation quantity is reduced by detecting not the static hand-shape recognition, but the ratio and size variation of hand-moving from the clipped hand region in real time, more response speed is guaranteed. In order to evaluate the performance of the our proposed method, after applying to the computerized self visual acuity testing system as a pointing device. As a result, the proposed method showed the average 86% gesture recognition ratio and 87% coordinate moving recognition ratio.

Au-ZnO 나노복합체의 국부화된 플라즈몬 효과에 따른 유기발광소자의 효율 향상

  • Lee, Yong-Hun;Kim, Dae-Hun;Kim, Tae-Hwan
    • Proceedings of the Korean Vacuum Society Conference
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    • 2016.02a
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    • pp.219-219
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    • 2016
  • 유기발광소자는 저전력, 빠른 응답속도, 고휘도 및 자체발광 등의 장점들 때문에 고체 광원과 플렉서블 디스플레이로 연구가 진행되고 있다. 유기발광소자는 유기 발광층을 인광물질로 사용 함으로서 100 % 내부양자 효율을 이루고 있지만 공기와 유리기판의 계면과 유리 기판과 ITO 계면에서 발생하는 내부 전반사 효과와 유기물과 ITO 기판 사이에서 발생하는 웨이브 가이드 효과 등으로 인해 발광량의 약 20 %만을 외부로 추출 할 수 있다. 따라서 유기발광소자의 광 추출 효과를 증가시키기 위해서 소자외부에 아웃커플링 필름 또는 마이크로렌즈 어레이 필름을 부착시키는 방법, 금속 나노 입자를 유기발광소자 내에 삽입하여 표면 플라즈몬 효과로 인한 광추출 효율을 높이는 방법 등이 제시되고 있다. 본 연구에서는 Au-ZnO 나노복합체를 간단한 졸겔법을 이용하여 양극 버퍼층으로 사용하여 그에 따른 계면, 전기적 및 광학적 특성을 분석하였다. Au-ZnO 나노복합체를 포함한 tris(8-hydroxyquinolinato) aluminium (Alq3) 발광층에서 ZnO를 포함한 Alq3 발광층보다 엑시톤 수명이 빠르게 감소하는 것을 시간 관련 단광자 계산(Time-Correlated Single Photon Counting) 측정을 통해서 알 수 있었다. 이러한 결과는 Au 금속 나노입자의 플라즈몬 흡수 파장과 Alq3 발광층에서 생성되는 발광 파장이 겹쳐서 효과적인 공명 에너지 전달효과로 인해 Alq3 발광층의 발광성질이 향상된 것을 의미한다. Au-ZnO 나노복합체와 ZnO 나노입자를 가지는 유기발광소자의 전류 효율은 50 mA/cm2 에서 각각 2.27와 1.83 cd/A 가지는 것으로 확인 되었다. 또한 Au-ZnO 나노복합체와 ZnO 나노입자를 사용한 유기발광소자의 전압-전류밀도가 유사한 것을 확인 할 수 있는데 이는 Au 금속 나노입자가 ZnO 나노입자의 정공 주입능력을 저하시키지 않는 것을 의미한다.

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Improvement of Hysteresis Characteristics of Low Temperature Poly-Si TFTs (저온 Poly-Si TFT 소자의 Hysteresis 특성 개선)

  • Chung, Hoon-Ju;Cho, Bong-Rae;Kim, Byeong-Koo
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.2 no.1
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    • pp.3-9
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    • 2009
  • Although Active matrix organic light emitting diode (AMOLED) display has a better image quality in terms of viewing angle, contrast ratio, and response time than liquid crystal displays (LCDs), it still has some critical issues such as lifetime, residual images, and brightness non-uniformity due to non-uniformity in electrical characteristics of driving TFTs and IR drops on supplied power line. Among them, we improved irrecoverable residual images of AMOLED displays which is mainly related to the hysteresis characteristics of driving TFTs. We consider four kinds of surface treatment conditions before gate oxide deposition for improving hysteresis characteristics. We can reduce the hysteresis level of p-channel TFT to 0.23 V, interface trap states between the poly-Si layer and gate insulator to $3.11{\times}10^{11}cm^{-2}$, and output current variation of p-channel TFT to 3.65 % through the surface treatment using ultraviolet light and H2 plasma. Therefore, the recoverable residual image problem of AMOLED displays can be improved by surface treatment using ultraviolet light and $H_2$ plasma.

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Fabrication of NTC thermistor embedded Miniature Thermoelectric Cooling Module for Temperature Control (NTC 써미스터가 내장된 항온 제어용 소형 열전 냉각 모듈 제조)

  • Park J. W.;Choi J. C.;Hwang C. W.;Choi S. C.
    • Journal of the Microelectronics and Packaging Society
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    • v.11 no.3 s.32
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    • pp.83-89
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    • 2004
  • NTC thermistor embedded miniature thermoelectric module was fabricated for the precise temperature control of optical communication device such as laser diode (LD). The miniature thermoelectric module ($7.2 mm{\times}9 mm{\times}2.2 mm$) consists of 21 BiTe thermoelectric couples, the operating temperature is precisely controlled by embedded thermistor with quick response. The figure-of-merit (Z), maximum temperature difference (${\Delta}T_{max}$), maximum cooling capacity ($Q_{max}$) of the miniature thermoelectric module were $2.5{\times}10^{-3}$/K, 72 K, 2.2 W respectively and temperature could be controlled in range of ${\pm}0.1^{\circ}C$ accuracy in air. The fabricated miniature thermoelectric module is suitable for applications of the optical communication packaging.

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TCP-Friendly Rate Control for Vertical Handover over Wireless Heterogeneous Network (무선 이종망 환경에서 Vertical Handover를 위한 TCP-Friendly 비트율 제어)

  • Pyun, Jae-Young
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.45 no.2
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    • pp.33-40
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    • 2008
  • Streaming video has become a popular form of transferring media over the wired/wireless network. TCP-friendly rate control (TFRC) is used as a streaming media transport protocol. Using the TCP congestion response function and current network conditions, TFRC adjusts its sending rate to yield the maximum TCP-friendly throughput. Since TFRC was designed for applications that would prefer to maintain a slowly-changing sending rate, it is less responsive to changes in handover between wireless heterogeneous networks such as 3G network, WLAN, and so on. This paper shows a new TFRC method for vertical handover over wireless heterogeneous network. The proposed TFRC method has features of low quality interruption and fast rate adaptation to a new target network. The simulation results show that the proposed one provides better QoS and throughput support than the traditional TFRC scheme during vertical handover.

Modeling and Simulation of A Small Hydraulic Actuation System for the Tactical Missile (전술유도무기용 소형 유압식 구동장치의 모델링 및 시뮬레이션)

  • Lee, Doyun;Lee, Hosung;An, Sungyong;Park, Yeonjung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.4
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    • pp.349-357
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    • 2017
  • If an actuation system of the tactical missile is required very fast response time on conditions of short operating time and big loads on the actuator, we would prefer to adopt a small hydraulic system. In this paper, a mathematical model is proposed to analyze and simulate the small hydraulic actuation system. The mathematical model consists of a high pressure vessel model, a pressure regulator model, a hydraulic reservoir model and a actuator model. The suggested model is validated by comparison of simulation results with experimental data. The simulation results show that the mathematical model could be useful for designing a hydraulic actuation system.

Dual Wavelength Erbium-doped Fiber Laser with Lasing Wavelength Switchability and Tunability (파장 가변 및 스위칭이 가능한 쌍파장 어븀 첨가 광섬유 레이저)

  • Park, Sang-Oh;Shim, Young-Bo;Yoon, Min-Seok;Chu, Su-Ho;Kim, Hyun-Joo;Kwon, Oh-Jang;Han, Young-Geun
    • Korean Journal of Optics and Photonics
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    • v.21 no.5
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    • pp.181-184
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    • 2010
  • A simple technique for a flexibly tunable and switchable dual wavelength-switchable erbium-doped fiber (EDF) laser using fiber Bragg gratings is proposed and demonstrated by using both linear cavity loss controlling and homogeneous gain broadening of the EDF. The oscillating wavelength switching is successfully realized by using the modulation of the acousto-optic modulator driven by the RF signal. The wavelength spacing and lasing wavelength of the proposed wavelength-switchable laser can also be controlled by using the bending-induced tension or compression strain. The proposed tunable dual wavelength-switchable fiber laser has a lot of advantages, such as a high extinction ratio larger than 40dB and a high tunability of ~7.2 nm/$m^{-1}$.

A Study for a Method of Designing of Security Domain Infrastructure and Its Efficiency Measuring (네트워크 보안 서비스 향상을 위한 도메인 구조설계와 성능분석 방법)

  • Moon, Song-Chul;Noh, Si-Choon;Jung, Ji-Moon
    • Journal of Digital Contents Society
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    • v.11 no.3
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    • pp.331-339
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    • 2010
  • On intranet system, it is essential element for providing information to decrease response time. To realize this efficiencies of response time of the network, a lot of research have been conducted. The purpose of the research and implementation is to shorten the response time of information system. We can realize final goal of information system through fast response time. This final goal of information system is to secure the performance efficiency within the required time. In order to acquire the method of warranty of fast response time, the efficient measurement method is essential. This research suggests a latency test techniques being used on infrastructure system and also offers a response time measurement methodology. Methodology proposed in this research has proven that it is possible to measure response time through the scheduled method. Also it is possible to develop a enhanced networking capabilities, and information system capabilities for the development of information system.