• Title, Summary, Keyword: Stealth

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Stealth Aircraft Technology and Future Air Warfare (스텔스 항공기 기술과 미래 항공전장)

  • Sohn, Myong-Hwan;Jung, JongHee;Lee, Joon;Kwag, Hyun-Ho
    • Journal of the Korea Institute of Military Science and Technology
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    • v.22 no.1
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    • pp.81-92
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    • 2019
  • Stealth means the reduction of all signature including the reflection/emission of radar, infrared, visible light and audio signals. Stealth aircraft can significantly improve the penetration capability, the combat survivability and the mission effectiveness. This paper presents the basic concept, the key elements and the application examples of stealth aircraft technology. Also it briefly describes the effect of the modern stealth aircraft on the future air warfare.

The Preparation and Evaluation of Streptokinase-entrapped $Stealth^{\circledR}$ Liposome (스트렙토키나제를 함유하는 스텔스$^{\circledR}$ 리포좀의 제조 및 평가)

  • Choi, Hyun-Soon;Lee, Gye-Won;Baek, Myung-Gee;Cho, In-Sook;Kim, Dong-Chool;Jee, Ung-Kil
    • Journal of Pharmaceutical Investigation
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    • v.30 no.1
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    • pp.13-19
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    • 2000
  • $Stealth^{\circledR}$ liposomes entrapped with streptokinase were prepared to improve the physical stability of conventional liposomes. The particle size distribution, dissolution rate and entrapping efficiency of the $Stealth^{\circledR}$ liposomes were studied. The entrapping efficiency of streptokinase into conventional liposomes was proportional to the total lipid and cholesterol amounts. In $Stealth^{\circledR}$ liposomes, the entrapping efficiency of streptokinase was increased with the increase of DPPE-PEG(5,000) amount. The particle size of $Stealth^{\circledR}$ liposomes decreased with the increase of DPPE-PEG(5,000) amount. The dissolution rate of streptokinase from conventional liposomes was decreased by addition of cholesterol. The dissolution rate of streptokinase from the $Stealth^{\circledR}$ liposomes was also decreased by addition of DPPE-PEG(5,000).

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Consideration on the Electromagnetic Wave Absorption Properties of the Plasma for the Stealth Technology (은신기술을 위한 플라즈마의 전자기파 흡수 특성에 대한 고찰)

  • In, S.R.
    • Journal of the Korean Vacuum Society
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    • v.17 no.6
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    • pp.501-510
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    • 2008
  • The stealth technology to conceal an aircraft from the vision of a radar have been accomplished by coating the surface with special paints absorbing the electromagnetic wave. Nowadays, researches to utilize characteristics of the plasma-wave interaction for realizing the stealth technology are actively progressed. In this paper, to investigate the physical feasibility of the plasma stealth, calculation results for the required conditions of the plasma cloaking on the aircraft flying in the air for showing the stealth function, using a flat non-magnetized non-uniform plasma model, are reported and discussed.

Proposal of STEALTH Protocol for Advanced Network Security systems (차세대 네트워크 보안 시스템을 위한 STEALTH 프로토콜 제안)

  • 오승희;남택용;손승원
    • Proceedings of the Korean Information Science Society Conference
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    • pp.571-573
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    • 2002
  • 복잡한 네트워크상의 지능적이고 다양한 방식의 사이버 태러로부터 안전하고 효율적으로 네트워크를 총체적으로 관리하기 위해서는 개별 네트워크 노드간의 정보 교환은 필수적이다. STEALTH 프로토콜이란 거대망에서 네트워크 노드들 사이에 안전한 정보 교환을 위한 일종의 보안 프로토콜로 기존의 보안 프로토콜이 지닌 트래픽의 속도 저하 및 암호화로 인한 네트워크의 과부하를 최소화한 프로토콜이다. 여기서는 기존의 보안 프로토콜에 대해서 그 종류와 기능을 살펴본 후, 제안하는 STEALTH프로토콜의 요구사항 및 기능에 대해서 다룬다. 마지막으로 STEALTH 프로토콜이 적용된 시나리오를 통해 이 프로토콜의 역할과 기능을 상세히 설명한다.

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Design of Transparent Electromagnetic Absorbing Structure for Stealth Aircraft Canopy (스텔스 전투기 캐노피를 위한 투명 전자파 흡수구조 설계)

  • Hong, Ic-Pyo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.18 no.4
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    • pp.369-375
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    • 2015
  • In this paper, transparent circuit analog radar absorbing structure with angular stability for stealth aircraft canopy was proposed and designed. To obtain wideband electromagnetic absorption, optical transparency and smaller thickness, we proposed the novel FSS(Frequency Selective Surface) for X-band and implemented the resistive FSS and PEC(Perfect Electric Conductor) plane using ITO(Indium Thin Oxide) coating with optical transmissivity of 90 %. Reflection loss characteristics for different incident angles of both TE(Transverse Electric) and TM(Transverse Magnetic) polarizations are presented through simulations. We then fabricated the proposed structure to verify the simulation results. The comparisons between the simulation and measured results show good agreements. The results also show that the proposed radar absorbing structure can provide better frequency stability for different incidence angles and polarizations as well as optical transparency. We can apply this proposed structure to the canopy of stealth aircraft and other stealth applications for visible transparency.

A Study of Backtracking of IPs and LINK Joints loaded with Stealth Functions (Stealth 기능을 탑재한 LINK관절 IP역추적 방법)

  • Yoo, Jae-Won;Park, Dae-Woo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.165-168
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    • 2013
  • The USA has declared the cyber space as the 5th battlefield following land, sea, air, and space. In contrast to physical wars, in national cyberwarfare differentiation between friend and foe is impossible, and the boundaries between the lines of attack and defense are obscure. Therefore, to perform national cyberwarfare, credibility of all command delivery information performed in the cyber space should be confirmed. In this paper, the authors have determined the commands performed in national cyberwarfare, granted authorized IPv6 in space including the earth, moon and Mars for information credibility, and used LINK joints loaded with stealth functions to secure the credibility of command information.

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RCS Numerical Simulation of Stealth Modified Three-Surface Aircraft

  • Cheng, Liangliang;Yue, Kuizhi;Xing, CuiFang;Yu, Dazhao
    • International Journal of Aeronautical and Space Sciences
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    • v.17 no.1
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    • pp.101-108
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    • 2016
  • The RCS characteristics of stealth modified three-surface aircraft are analyzed in this paper. Prototype A is built with CATIA software and the three-dimensional digital models of modified stealth three-surface B and C are also designed based on carrier-based aircraft Su-33; the numerical simulation of RCS characteristics of three-surface aircraft is conducted with RCSAnsys software based on physical optics method and the method of equivalent currents; The following results are obtained by comparative analysis and mathematical statistics: (1) by the use of physical optics method and equivalent electromagnetic current method, the scattering intensity for each part of the model and RCS characteristic of the aircraft can be analyzed efficiently and accurately; (2) compared with model A, the mean RCS value of model B is reduced to 14.1% in forward direction and 48.1% in lateral direction; (3) compared with model A, the mean RCS value of model C decreases to 11.4% in forward direction and 21.6% in lateral direction. The results are expected to provide theoretical basis and technical support to the conceptual design of aircraft and stealth technology research.

Development of RAM in Millimeter Wave Range for RF Stealth (RF 스텔스를 위한 밀리미터 RAM 개발)

  • Choi, Chang-Mook;Lim, Bong-Taeck;Ko, Kwang-Soob
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.555-558
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    • 2009
  • In this paper, stealth technology is investigated with RCS(Radar Cross Section) reduction to minimize detection range of retroreflective echoes from enemy. Most RCS reduction comes from shaping. RAM(Radar Absorbing Materials) are applied only in areas where there are special problems. Therefore, we designed and fabricated a RAM that has absorption ability higher than 17 dB at 94 GHz for RF stealth in millimeter wave range. As a result, detection range of enemy can be reduced in the 62 percent range by using a developed RAM.

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Performance Evaluation of Stealth Chamber as a Novel Reference Chamber for Measuring Percentage Depth Dose and Profile of VitalBeam Linear Accelerator (VitalBeam 선형가속기의 심부선량백분율과 측방선량분포 측정을 위한 새로운 기준 전리함으로서 스텔스 전리함의 성능 평가)

  • Kim, Yon-Lae;Chung, Jin-Beom;Kang, Seong-Hee;Kang, Sang-Won;Kim, Kyeong-Hyeon;Jung, Jae-Yong;Shin, Young-Joo;Suh, Tae-Suk;Lee, Jeong-Woo
    • Journal of radiological science and technology
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    • v.41 no.3
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    • pp.201-207
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    • 2018
  • The purpose of this study is to evaluate the performance of a "stealth chamber" as a novel reference chamber for measuring percentage depth dose (PDD) and profile of 6, 8 and 10 MV photon energies. The PDD curves and dose profiles with fields ranging from $3{\times}3$ to $25{\times}25cm^2$ were acquired from measurements by using the stealth chamber and CC 13 chamber as reference chamber. All measurements were performed with Varian VitalBeam linear accelerator. In order to assess the performance of stealth chamber, PDD curves and profiles measured with stealth chamber were compared with measurement data using CC13 chamber. For PPDs measured with both chambers, the dosimetric parameters such as $d_{max}$ (depth of maximum dose), $D_{50}$ (PDD at 50 mm depth), and $D_{100}$ (PDD at 100 mm depth) were analyzed. Moreover, root mean square error (RMSE) values for profiles at $d_{max}$ and 100 mm depth were evaluated. The measured PDDs and profiles between the stealth chamber and CC13 chamber as reference detector had almost comparable. For PDDs, the evaluated dosimetric parameters were observed small difference (<1%) for all energies and field sizes, except for $d_{max}$ less than 2 mm. In addition, the difference of RMSEs for profiles at $d_{max}$ and 100 mm depth was similar for both chambers. This study confirmed that the use of stealth chamber for measuring commission beam data is a feasible as reference chamber for fields ranging from $3{\times}3$ to $20{\times}20cm^2$. Furthermore, it has an advantage with respect to measurement of the small fields (less than $3{\times}3cm^2$ field) although not performed in this study.

An Experimental Study on the Aerodynamic Characteristics of a Stealth Configuration (스텔스 형상 공력특성에 관한 실험적 연구)

  • Oh, See-Yoon;Kim, Sang-Ho;Ahn, Seung-Ki;Cho, Cheol-Young;Lee, Jong-Geon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.36 no.10
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    • pp.962-968
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    • 2008
  • An experimental study of the aerodynamic characteristics of a stealth configuration, the test techniques developed for the testing in the Low Speed Wind Tunnel of Agency for Defense Development(ADD-LSWT), and the lessons learned have been presented. The main objectives of this test are to determine the aerodynamic characteristics of a stealth configuration and to measure the flow field characteristics with a 5-hole pressure probe. The test results are discussed and the effect of the leading edge shape on the aerodynamic characteristics is also given.