• Journal of IKEEE
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• v.15 no.2
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• pp.171-178
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• 2011

In this paper, a novel pulse repetition interval (PRI) jittering coder based on quasi-random M-sequence codes is proposed for improvement of counter-countermeasure capability in a radar. Each of the proposed jittered 256 PRI codes has a unique code chip combination with 256 code chips, such that any set of three consequent code chips (4 pulses) from any code appears only once among the entire code chip sequences of the codes. This indicates that only 4 of received pulses are enough to determine uniquely the exact timing position of the incoming pulse train (or code chip sequence) required for counter-countermeasure, as well as the identity of the transmitted code. To prove the proposed idea experimentally, the jittered PRI coder is implemented and demonstrated.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.1059-1062
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• 2000

Infrared (IR) seeker identifies the location of a target by detecting the infrared energy radiated from the target, and enables the missile to track the target. To improve the tracking performance, a counter- countermeasure (CCM) is essential to minimize the effect of the countermeasure (CM), which is operated by a target to protect itself. In this paper, we propose a crossed array tracker (CAT) using two-color CCM algorithm. The CAT using the proposed algorithm shows better tracking performance by minimizing the effect of CM.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.35S no.11
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• pp.166-175
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• 1998

The previous simulation models of infra-red (IR) reticle seekers were performed in a static situation. However, in this paper, we develop a new simulation tool which is applicable in various cases, and propose an efficient counter-countermeasure (CCM) in the presence of countermeasures (CM) such as flares. The developed tool analyzes performance of rotating Lovell reticle seeker, and gives tracking performances in various scenarios. The simulation results show that our counter-countermeasure algorithm makes an efficient target tracking in the presence of flares.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.12A
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• pp.1990-1999
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• 2001

This paper presents a dynamic simulation loop that gives tracking results of 2-color concentric annular ring (CAR) reticle seeker. Our simulation tool includes the target/flare model and a proportional navigation guidance (PNG) loop. The CAR reticle system performances and the flare effects are analyzed in various scenarios. When a flare is present in the field of view (FOV), the simulation results show that the reticle seeker cannot keep a precise target tracking. In this paper, we propose 2-color counter-countermeasure (CCM) using the least mean square (LMS) method to cope with a presence of IR flare. The proposed method makes a simultaneous process in two infrared (IR) wavelength bands: MWIR add SWIR. The simulation results have shown that our adaptive IRCCM algorithm can achieve an effective cancellation of the flare signal with a relatively high intensity.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.12
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• pp.3165-3173
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• 1996

The existing modeling of infrared reticle seekers is perfored in a static sitic situation. Inthis paper, we develop the dynamic simulator of the reticle seekers and propose an efficient signal processing algorithm in multiple targets, especially flares. the developed simuator is essential to analyze the performance of the infrared reticle seekers in various conditions and study effective signal procesing techniques. Simulations show that the proposed counter-countermeasure algorithm is simple and efficient.

• Journal of Information Technology Applications and Management
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• v.15 no.2
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• pp.67-82
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• 2008

Risk that breed large size disaster is happening variously for cause at social. natural a management. Incidence and damage scale are trend that increase rapidly than past. In these circumstance, to keep operational continuity of organization, area, society, risk management action that establish systematic counter measure estimating and analyze occurrence possibility and expectation damage of risk is essential indispensable issue and the best countermeasure. Risk management action does by main purpose establish optimum disaster reduction countermeasure. To deduce various countermeasure, process that estimate and analyze occurrence possibility and expectation damage of risk is essential indispensable issue. Therefore, this paper studies process design that can presume risk occurrence frequency and damage scale through distribution of probability.

• Journal of the Society of Disaster Information
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• v.9 no.4
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• pp.423-428
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• 2013

This study aims at countering terror. So, this study explores an implication to Korea through the countermeasure of Japanese organizational direction to countermeasure. As a result, first, some countermeasures on IED need to be sought. Second, a chance of domestic terrorism growing should be checked. Third, safety of major facilities needs to be saught. Finally, Public Service System on Education and Information for Counterterrorism must be built.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.4A
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• pp.316-323
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• 2002

In this paper, we propose a counter-countermeasure (CCM) in a crossed array tracker for efficient target tracking under countermeasures (CM) operated by a target. The proposed CCM adepts two detection bands and uses the signal distribution characteristics to discriminate between the target and the CMs. To avoid wrong detection of a target position due to missing signal pulses, it predicts current target position based on previous target position. To evaluate the performance of the proposed CCM in a crossed array tracker, we perform numerical simulations for target signal extraction and target tracking under various conditions. The simulation results show that the proposed CCM removes the CM effect well and tracks the target efficiently.

• Proceedings of the Korean Geotechical Society Conference
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• 2004.03b
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• pp.600-605
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• 2004

The road construction with horizontal expansion of country using and augmentation of traffic demand is advanced actively and it accompanies hereupon, the above of 70% of the country is formed at the mountain in our country where the hazard cut slope has been created. In this study, It is prepared a effective management countermeasure of cut slope introduced priority investigation decision method against hazard cut slope which is influenced by abnormally rainfall by an unusual change in the weather such as a guerilla rainfall character. In meaning link, It was executed collapse cause by failure character analysis in the cut slope which has failed for the last five years and it is prepared the hazard grade criterion from E to A grade according to collapse cause. It is decided that a maintenance management grade by the hazard grade classification criterion of cut slope. So It is possible to hazard cut slope. It is established failure protection counter countermeasure by effective maintenance management through the hazard grade c1assification criterion and it will be able to dispose to advanced nation level like Hong Kong and Japanese.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.817-820
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• 2001

본 논문에서는 섬광탄 (flare)과 같은 공중 표적(target)의 대응 능력 (CM; countermeasure) 에 효과적으로 대처할 수 있는 2-color 탐색기의 반대응 (CCM; counter-countermeasure) 알고리듬을 제안하고자 한다. 자외선 (UV) 및 적외선 (IR) 대역을 동시에 이용하는 2-color 탐색기는 표적과 섬광탄의 방사에너지 특성을 적외선 및 자외선 대역에서 비교, 분석하여 대역별 특성을 결정한다. 이러한 특성을 이용하여 두 대역의 입력 신호로부터 효과적으로 표적 신호만을 검출, 추적함을 보인다. 또한 제안된 2-color 방식을 로젯 주사 탐색기(rosette scan seeker)의 반대응 능력으 펄 이용하여 동적 시뮬레이션을 수행한다.