• 한국군사과학기술학회지
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• 제22권1호
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• pp.93-105
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• 2019

In order to establish an effective engagement plan of the missile defense system, both spatial and temporal performance analysis of the intercept system should be performed. However, research on existing missile defense systems has been mainly focused on spatial performance. In this study, time performance factors are defined through the composition and operational concept of missile defense system, and the target ballistic missile interception process is presented as integrated timeline through ballistic missile model and radar model. We also proposed an algorithm for deriving time performance. Simulation results confirm that the time performance factors can be used in the engagement planning for multi-engagement through the example of engagement planning.

• 한국인터넷방송통신학회논문지
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• 제19권3호
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• pp.185-191
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• 2019

현대전에서는 다중 적기 편대가 침공할 경우 이를 무력화시키기 위해 지대공미사일 발사포대의 미사일로 효과적이면서도 빠르게 위협을 최소화시키는 전략이 필수적이다. 이 문제에 대해 Pan et al.은 유전자 알고리즘을 적용하여 해를 구하고자 하였으나 최적 해를 구하는데 실패하였다. 본 논문에서는 각 미사일 발사포대 가용 미사일의 75%로 고위협 목표물을 우선하여 파괴시키는 전략으로 초기 실현 가능 해를 구하였다. 다음으로 각 발사포대에 배정된 미사일 1발을 감소시켜 총 위협을 보다 감소시킬 수 있는 다른 목표물로 이동시키는 최적화 기법을 제안하였다. 실험 결과 제안된 알고리즘은 다항시간 수행 복잡도의 탐욕 알고리즘임에도 불구하고 메타휴리스틱 기법인 유전자 알고리즘에 비해 해를 개선하는 결과를 얻었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권7호
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• pp.3213-3230
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• 2016

Sensor node (SN) is a crucial part in any remote monitoring system. It is a device designed to monitor the particular changes taking place in its environs. Wireless sensor network (WSN) is a system formed by the set of wirelessly connected SNs placed at different geographical locations within a target region. Precise placement of SNs is appreciated, as it affects the efficiency and effectiveness of any WSN. The manual placement of SNs is only feasible for small scale regions. The task of SN placement becomes tedious, when the size of a target region is extremely large and manually unreachable. In this research article, an automated mechanism for fast and precise deployment of SNs in a large scale target region has been proposed. It uses an assembly of rotating cannons to launch the SNs from a moving carrier helicopter. The entire system is synchronized such that the launched SNs accurately land on the pre-computed desired locations (DLs). Simulation results show that the proposed model offers a simple, time efficient and effective technique to place SNs in a large scale target region.

• Journal of Astronomy and Space Sciences
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• 제34권4호
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• pp.331-342
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• 2017

To ensure the successful launch of the Korea pathfinder lunar orbiter (KPLO) mission, the Korea Aerospace Research Institute (KARI) is now performing extensive trajectory design and analysis studies. From the trajectory design perspective, it is crucial to prepare contingency trajectory options for the failure of the first lunar brake or the failure of the first lunar orbit insertion (LOI) maneuver. As part of the early phase trajectory design and analysis activities, the required time of flight (TOF) and associated delta-V magnitudes for each recovery maneuver (RM) to recover the KPLO mission trajectory are analyzed. There are two typical trajectory recovery options, direct recovery and low energy recovery. The current work is focused on the direct recovery option. Results indicate that a quicker execution of the first RM after the failure of the first LOI plays a significant role in saving the magnitudes of the RMs. Under the conditions of the extremely tight delta-V budget that is currently allocated for the KPLO mission, it is found that the recovery of the KPLO without altering the originally planned mission orbit (a 100 km circular orbit) cannot be achieved via direct recovery options. However, feasible recovery options are suggested within the boundaries of the currently planned delta-V budget. By changing the shape and orientation of the recovered final mission orbit, it is expected that the KPLO mission may partially pursue its scientific mission after successful recovery, though it will be limited.