• Journal of Positioning, Navigation, and Timing
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• 제9권2호
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• pp.139-147
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• 2020

In this paper, design measure were proposed for the construction of terminal systems for airborne platforms, which are key element in the Joint Tactical Data Link System (JTDLS) complete system. The Korean perfect tactical data link (JTDLS) is a communication system to establish an independent tactical data link network and needs to develop a MIDS-LVT (Link-16) communication terminal for datalink. Once a Ground/Navy JTDLS terminal system is established around airborne platform, it will be possible to break away from reliance on NATO-based tactical data link joint operations and establish independent Korean surveillance reconnaissance real-time data sharing and tactical data link operations concepts. in this paper, the essential development elements of airborne platform mounting and operable JTDLS terminals are presented, and the concept of system design is proposed to embody them. Further, improved system performance was analyzed by applying the concepts of complex relative navigation system and Advanced TDMA protocol for the deployment of airborne tactical datalink networks.

• 한국군사과학기술학회지
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• 제14권3호
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• pp.501-508
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• 2011

In this paper, we propose a channel allocation algorithm of MSAP(Mobile Subscriber Access Point) and data delivery scheme exploiting the symbol level network coding. The network is comprised of TS(Tactical Switch) as a backbone node, MSAPs, and TMFTs(Tactical Multi-Function Terminal). The TS performs the channel allocation considering the communication range overlapping between the neighboring MSAPs and applies the symbol level network coding, if necessary, depending on the position of the TMFTs. Assuming the number of available antennas of TMFT and MSAP will be extended to two from one, we propose two schemes: single mode and dual mode. Through the simulation, we show that the proposed delivery scheme provides higher delivery ratio and lower delivery delay compared with the legacy store-and-forward scheme.

• 전자공학회논문지
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• 제50권5호
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• pp.50-58
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• 2013

이 논문은 UWB 방식을 사용하는 병사통신용 단말기 구현 결과를 보여준다. 병사통신 망의 주요 특성들인 i)음성데이터가 주된 전송데이터이고, ii)보행자 수준의 이동 속도를 가지고, iii)높은 망의 안정성이 필요함을 고려하여 물리계층부터 응용계층까지 전 프로토콜 계층들을 설계하였다. 설계된 프로토콜 계층들은 RF ASIC, FPGA, DSP, GPP 등을 이용하여 소프트웨어와 하드웨어 형태로 구현되었다. 시험을 통해 구현된 단말기가 1대1 통신, 멀티홉 통신 환경에서 음성데이터를 정상적으로 전송함을 확인하였다.

• 한국항해항만학회지
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• 제28권4호
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• pp.285-291
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• 2004

The productivity of container terminal is determined by its various operation methods. This paper aims at finding out the factors to enhance the productivity of container handling of quay crane, using simulation technique. Three levels of decision making in terminal operation, strategy, and tactics and operation are selected for defining parameters of simulation The result of the simulation and test shows that the significant factors to improve the productivity are the stack height of container, block dispersion and the distance in yard planning for shipment. Decision making in the operation level, however, is of significance in the mixed condition of strategic and tactical level. The result shows meaningful guidelines in decision making under strategic, tactical and operation level.

• 한국군사과학기술학회지
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• 제13권3호
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• pp.397-404
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• 2010

Recently, there is on-going research about tactical data link system based on the legacy radio. Tactical data link based on legacy radio is operated mostly in narrow bandwidth under 25khz. Communicating traffics in nodes participated at network need to be minimized for distributing tactical data in narrow bandwidth. In addition, the data distributing structure is necessary for distributing tactical informations such as a situation awareness and so on to war fighters. However, conventional server-client system wastes a lot of time to obtain information for war fighters as user uses pull system to gather necessary information by seeking it one by one. Especially, the fighter pilot is supposed to dedicate into a situation awareness and fight mission in every seconds but seeking information of a user terminal while aircraft maneuvering affects as obstacle to concentrate engaging hostiles. therefore, push technology, the tactical data distributing system, is necessary for war fighters to receive fixed tactical data automatically without putting attention to it. This paper propose the UMPC tactical data link push framework. the UMPC tactical data link is a tactical data link system based on the legacy radio. Proposed push framework is verified by composing experiment environment and testing.

• 한국전자통신학회논문지
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• 제15권2호
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• pp.357-362
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• 2020

군 전술정보통신체계(TICN: Tactical Information and Communication Network)의 하위체계라 할 수 있는 전술다기능단말기(TMFT: Tactical Multi-Functional Terminal)는 개인 사용자에게 음성통화, 데이터 송수신, 멀티미디어 서비스를 제공하는 체계이다. 2011년도 개발당시 전술다기능단말기 전원회로는 충전IC를 거쳐 각각의 소자에 전원을 공급하는 구조였으나, 새로 개선된 전원회로는 충전IC를 별도로 구성하지 않고 PMIC(Power Management Integrated Circuit)를 통해 각 소자에 전원이 공급되도록 하였다. 본 논문에서는 개발단계의 전원회로설계가 적용된 전술다기능단말기와 신규 PMIC를 적용한 전술다기능단말기의 전원구조를 비교하였다. 그리고 소비전류, 충전시간, 충전 시 단말기 온도상승 등의 성능평가를 통해서 설계 개선 및 부품의 적합성을 검증하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 추계학술대회
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• pp.709-712
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• 2010

다수의 이동 가입자 단말들을 고정된 기지국이 관리하는 인프라 구조를 갖는 이동통신망과는 달리 미래 군 전술정보통신체계에서는 네트워크를 관리하는 중심 단말기가 존재하지 않고 모든 이동 단말기가 독립적인 형태로 존재하며 사전에 특정한 네트워크에 속하거나 액세스 포인트를 갖지 않는 특징을 가지고 있다. 이러한 비교적 작은 규모의 Ad-hoc 네트워크에 대해서는 특정한 크기로 메시지 크기가 제한되는 경우에서만 클러스터 구조가 보다 큰 효율성을 보장할 것으로 예상되며, 군 전술정보통신체계를 위한 클러스터 구조에 대한 연구를 통하여 네트워크의 효율성을 최대로 활용할 수 있도록 적응형 클러스터 형성 알고리즘의 개발이 반드시 필요함을 알 수 있다.

• 산업공학
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• 제19권4호
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• pp.270-280
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• 2006

The shipping plan for an efficient augmentation of terminal is NP-hard problem which is subordinate to a shipping quantity. The load location problem and stowage planning problem are two important tactical problems for the efficient operations of container terminals. This paper is concerned with reduction of feasible region in constraints for stowage planning. After designing model which minimizes the number of shifting and the travel distance of the transfer crane, the simulated annealing algorithm is employed to search optimal solution quickly and accurately. In order to apply more realistic approach, the partial restriction through adding hatch is complemented to stowage planning decision problem applied in cluster. A variety of numerical experiments demonstrated that solutions by simulated annealing algorithm are useful and applicable in practice.

• 대한산업공학회지
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• 제33권3호
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• pp.290-302
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• 2007

This paper introduces several decision-making problems that need to be solved in order to facilitate the efficient operation of container terminals. These decision-making problems include the berth planning problem, the quay crane scheduling problem, the unload/load sequencing problem, the yard allocation problem, and the short-term scheduling of transporters and yard cranes. These problems can be classified into strategic decision problems, tactical decision problems, and real time operational decision problems. This paper proposes definitions of the problems that can be used to develop mathematical models for the problems.

• 한국군사과학기술학회지
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• 제1권1호
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• pp.211-218
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• 1998

As a part of trajectory modulation to increase system survivability and terminal effectiveness, impact angle control is required in the terminal phase of tactical missile systems. The missile systems are not allowed to have high altitude to reduce probability of detection by sensors of missile defense systems. In this paper, an analytic form of a time-optimal control law is suggested in the case of constrained missile maneuverability and impact angle under the assumption of a zero-lag autopilot. The control law is obtained by establishing optimal missile-target engagement geometry in the vertical plane. Extension of the law for missiles with autopilot response lags requiring a numerical solution is studied by introducing an iterative algorithm for optimal switching time determination of which the initial switching instants are obtained from the analytic solution. Also suggested is a closed-form impact angle control law derived by an energy-optimal approach. The performances of the proposed guidance laws are evaluated by a series of computer runs.