• Title/Summary/Keyword: Counter-measure

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A Study on the Counter Program of the Radiation Detector Using 8051 Micro-controller (8051 마이크로 콘트롤러를 이용한 휴대용 방사능 측정기의 카운터 프로그램 연구)

  • Kim, Yong-Duk;Park, Se-Kwang
    • Journal of Sensor Science and Technology
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    • v.6 no.3
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    • pp.228-236
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    • 1997
  • Radioactive materials need to control, measure and protect precisely the overflow because they are dangerous. In this paper, GM-counter type radiation detector system, that can precisely measure the quantity of radioactivity using improved counting program is designed and program that can store and transfer the counted data is studied. The manufactured system, counting system of GM-counter type radiation detector, and counter program can be utilized to measure them at various methods in an atomic power plant and research centers.

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The effect of vibratory stimulus on pain perception during intraoral local anesthesia administration in children: a systematic review and meta-analysis

  • Tirupathi, Sunny Priyatham;Rajasekhar, Srinitya
    • Journal of Dental Anesthesia and Pain Medicine
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    • v.20 no.6
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    • pp.357-365
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    • 2020
  • Background: To evaluate the effectiveness of vibration as a counter-stimulatory measure in reducing subjective pain due to local anesthesia administration in children. Methods: Electronic databases (PubMed, Ovid SP, Cochrane Central Register of Controlled Trials) were searched until April 2020. Studies were screened by titles and abstracts, followed by full text evaluation of the included studies. Results: A total of seven studies involving 376 children aged 5-17 years were included in the systematic review and meta-analysis. The meta-analysis compared vibration as a counter-stimulatory measure with no vibration as a comparator. The primary outcome evaluated was pain perception or subjective pain reported by the child. The secondary outcome evaluated was objective pain evaluated in each study. The pooled mean difference favored vibration to be effective for the first outcome. Conclusion: Within the limits of this systematic review, low quality evidence suggests that vibration as a counter-stimulatory measure is effective in reducing the subjective pain reported by children during local anesthesia administration.

군 통신에서의 재밍(Jamming) 기술

  • Kim, Jin-Hyeong;Kim, Eun-Cheol;Lee, Jong-Myeong
    • Information and Communications Magazine
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    • v.26 no.3
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    • pp.32-40
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    • 2009
  • 최근 전자전 (EW : Electronic Warfare)은 현대전의 핵심으로 자리매김하고 있다. 전자전에서 재밍 (Jamming)은 적군의 통신을 교란시키는 전자공격 (EA : Electronic Attack)을 의미하는 것으로 재밍 전술은공격 대상에 따라서 여러 가지로 나눌 수 있다. 본고에서는 군통신에서 사용되는 전자방해책 (ECM : Electronic Counter Measure)인 재밍 기술을 소개하고, 재밍 신호에 대한 대책으로 재밍 신호를 효과적으로 검출하고 제거할 수 있는 전자방해방어책인 (ECCM : Electronic Counter Counter Measure) 항재밍 (Anti-Jamming) 방안도 함께 분석 소개하고자 한다.

Development of Microvolume LET Counter for Therapeutic Heavy Ion Beam

  • Hirai, Masaaki;Kanai, Tatsuaki
    • Proceedings of the Korean Society of Medical Physics Conference
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    • 2002.09a
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    • pp.231-232
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    • 2002
  • We have been developing microvolume LET counter in order to measure the three-dimensional LET distribution of the therapeutic heavy ion radiation volumes in the water phantom. With help of the technique of cathode induced carhge readout, this detector has a rectangular (box-shape) sensitive volume of which size is about 1 mm$^2$ and 2mm (depth).

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The Analysis and Counter-Measure for Signal Distortion of the Searching Radar Due to Ship Structures (함정 구조물에 의한 탐색 레이다 신호 왜곡 현상 분석 및 대책)

  • Song, Ki-Hwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.7
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    • pp.625-630
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    • 2009
  • In this paper, we introduce the analysis and counter-measure of signal distortion of search radar equipped on the ship. Using ShipEDF program, the search radar's main antenna and ship structures are modeled in the view of electromagnetism. Ray tracing method is used for analysis of the search radar's radiation patterns in free space and ship condition. From analyzed radiation patterns, we can conclude that the search radar's signal distortion is due to radiation pattern distortion. We also analyze the surface current distribution of the mast to propose the counter-measure to reduce electro-magnetic field reflection of mast.

Countermeasure of Uumanned Aerial Vehicle (UAV) against terrorist's attacks in South Korea for the public crowded places (국내 소프트 타깃 대상 드론테러의 법제도 개선방안 연구)

  • Oh, Hangil
    • Journal of the Society of Disaster Information
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    • v.15 no.1
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    • pp.49-66
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    • 2019
  • Purpose: This study aims to apply the counter terrorism policy in pertain to malicious drone abuse and the croweded public places in South Korea. And, to improve counter terrorism protection measure, this study suggests an adoptation of Anti UAV technology into counter terrorism related regulation. Method: Compared to nations' operations of counter terrorism prevention and protection activities with the South Korean gov, problems and limitations are suggested. Results: Anti UAV technology could not be applied for Multi-user facilities by any law due to the limitation, so that it is required to amend counte terrporism related policies and law. Conclusion: This study intends to identify various protection methods against UAV threats. To reduce the risk of UAV, the law of public safety and counter terrorism should be promoted and reinforced for the first.