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A Study on the Multi-Tactical Data Link Data Management (다중 전술 데이터링크 데이터 관리에 대한 연구)

  • Hwang, Jung-Eun;Lee, Kang;Jung, Suk-Ho
    • The Journal of the Korea institute of electronic communication sciences
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    • v.15 no.3
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    • pp.457-464
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    • 2020
  • ROK Forces operate Link-11, Link-16 and Korean Tactical Data Link System with Link-K(JTDLS: Joint Tactical Data Link System). As the change from Link-11 to Link-22 approaches, in the JTDLS Completed Business will be added tactical data link processing such as Link-22. In this paper, we propose the data management structure for data from multiple tactical data links. Also, we simulate to find ways to process a lot of data quickly using Shared Memory, In-Memory DB, Self Development DB in DLP, and then we confirm the result.

Methodology of Interoperating Link-K Track Number in Multi TDLs (다중 전술데이터링크 간 Link-K 트랙 번호 상호운용 기술)

  • Lee, Youn-Jeong;Kim, Sang-Jun;Lim, Man-Yeob
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38C no.12
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    • pp.1186-1195
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    • 2013
  • In modern warfare, the main factor of triumph is superior situation awareness which leads rapid command decision and precisely guided munition, and TDL(Tactical Data Link) is the main communicational enabler. ROK forces currently operate Link-16 with allied forces and are also developing Korean national data link, Link-K which is also planned to be cooperated with Link-16. Assigning participant and track numbers needs agreement between ROK and allied forces, but ROK forces have exclusive authority in assigning numbers in Link-K. This paper proposes the effective method of exchange participant and track numbers between Link-16 and Link-K, and applicability verification in operational test and evaluation will be also presented.

Reliable Dynamic TDMA Scheme with new Packing method for Image Transmission over Link-16 (Link-16에서 이미지 전송을 위한 신뢰성 기반의 동적 TDMA 기법과 새로운 패킹 방법)

  • Baek, Hoki;Lim, Jaesung;Koo, Jayeul;Jin, Jeonghwan;Chun, Philseong;Oh, Ilhyuk
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37C no.11
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    • pp.1045-1053
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    • 2012
  • Link-16 is a widely used TDL (Tactical Data Link) which uses TDMA (Time Division Multiple Access). Link-16 is a very low rate system, so it supports small size of data like tactical message and voice. However, there are related works to transmit situation awareness information like image due to the increasing interest about EBO(Effect-Based Operation), recently. Special TDMA scheduling is needed not static TDMA of Link-16 for image transmission because image data has much larger size than the existing tactical data. In this paper, we proposed Link-16K which enhances the Link-16 MAC. The proposed Link-16K is compatible with Link-16, and includes dynamic TDMA, new packing method, and an efficient retransmission scheme for image transmission effectively. We can see that image transmission delay is reduced and channel utilization is increased through simulation results of proposed idea.

Design and Implementation of Simulator for Link-16 Network Operational Performance Analysis (Link-16 네트워크 운용성능분석을 위한 시뮬레이터 설계 및 구현)

  • Lee, Sangtae;Wi, Sounghyouk;Kim, Youngseung;Lee, Jungsik;Jee, Seungbae;Lee, Seungchan
    • Journal of the Korea Society for Simulation
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    • v.28 no.4
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    • pp.33-43
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    • 2019
  • Link-16 is a data link that provides joint interoperability to the US Navy, Air Force and NATO. Currently, the military relies entirely on foreign SW and tools for test environment, tactical simulation training and interoperability verification test for Link-16 operation. Therefore, it is necessary to develop Link-16 based operation environment test tool. In this paper, Link-16 network operational performance analysis simulator was developed by analyzing the function of Link-16 foreign tools. It also implements the SIMPLE standard interface for interworking with foreign SW and tools. The functional model for Link-16 network operation performance analysis consists of pre-analysis, real-time operational analysis, and post-analysis functional model. Each functional model test was performed through SIMPLE interworking with foreign SW and tools. Link-16 network operation performance analysis If we replace foreign SW through simulator, we can perform tactical training, network design verification and operation (scenario) verification for our military.

A study on the link composition design of a double link type level luffing jib crane (II) (이중 링크 형식 수평 인입 집 크레인의 링크 구성 설계에 관한 연구(II))

  • Hur, C.W.;Choi, M.S.;Moon, D.H.
    • Journal of the Korea Society For Power System Engineering
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    • v.15 no.1
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    • pp.57-63
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    • 2011
  • It is very important to determine link composition of a crane in the basic design of the crane. There are many parameters in the design for the link composition of a double link type level luffing jib crane. We analyze the variation of link composition according to the variation of these parameters which are the angle of fixed link, the angle between the fixed link and backstay when the position of the crane is the maximum working radius, the ratio of fly jib length between two moving hinges to the total length of fly jib, the length of backstay, and the slewing radius. In this paper, we describe the application of the previous analysis program of the link composition design for a double link type level luffing jib crane.

Link Recovery Scheme Using Cooperative Communication for VLC System (VLC 시스템을 위한 협동 통신을 이용한 링크 복구 방식)

  • Le, Nam-Tuan;Choi, Sun-Woong;Jang, Yeong-Min
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.5B
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    • pp.357-364
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    • 2012
  • In Visible Light Communication (VLC) system, with the limitation of transmission range and Field Of View (FOV), LOS (Line of Sight) link between two transceivers should be guaranteed due to the straightness of the visible-light signal. Especially for indoor applications, link recovery is an advantage method to remain the link connection because of the link failure in which caused by movement obstacle. Link recovery schemes try to keep link dynamically without re-initialing connection. This article proposes a new link recover scheme for VLC system by using cooperative communication. Our propose scheme focuses on the QoS reservation resource by GTS in IEEE 802.15.7 specification in which the requested QoS resource from client should be guarantee during the application time. With the link recovery scheme, we will try to continue the link connection as long as possible when unexpected disconnect link. The mathematical analysis and simulation results show that proposed scheme increases the overall reliability of the VLC system.

Adaptive DC-link Voltage Control for Shunt Active Power Filter

  • Wang, Yu;Xie, Yun-Xiang
    • Journal of Power Electronics
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    • v.14 no.4
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    • pp.764-777
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    • 2014
  • This study analyzes the mathematical relationship between DC-link voltage and system parameters for shunt active power filters (APFs). Analysis and mathematical deduction are used to determine the required minimum DC-link voltage for APF. A novel adaptive DC-link voltage controller for the three-phase four-wire shunt APF is then proposed. In this controller, the DC-link voltage reference value will be maintained at the required minimum voltage level. Therefore, power consumption and switching loss will effectively decrease. The DC-link voltage can also adaptively yield different DC-link voltage levels based on different harmonic currents and grid voltage levels and thus avoid the effects of harmonic current and grid voltage fluctuation on compensation performance. Finally, representative simulation and experimental results in a three-phase four-wire center-split shunt APF are presented to verify the validity and effectiveness of the minimum DC-link voltage design and the proposed adaptive DC-link voltage controller.

Lane Adaptive Recovery for Multiple Lane Faults in Optical Ethernet Link

  • Han, Kyeong-Eun;Kim, Sun-Me;Lee, Jonghyun
    • ETRI Journal
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    • v.36 no.6
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    • pp.1066-1069
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    • 2014
  • We propose a lane adaptive recovery scheme for multiple lane faults in a multi-lane-based Ethernet link. In our scheme, when lane faults occur in a link, they are processed not as full link faults but as partial link faults. Our scheme provides a higher link utilization and lower packet loss rate by reusing the available lanes of the link and providing a low recovery time of under a microsecond.

Performance Analysis of Link-16 Waveform considering Frequency Remapping under PBNJ (부분대역 잡음 재밍 환경에서의 주파수 재할당을 고려한 Link-16 성능 분석)

  • Lee, Kyuman;Noh, Hongjun;Lee, Jongkwan;Lim, Jaesung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38C no.11
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    • pp.955-965
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    • 2013
  • The joint tactical information distribution system (JTIDS) is used as the communication terminal of Link-16 by the United States armed forces, north atlantic treaty organization (NATO), and other allied forces. A portion of Link-16 frequencies may be shortly remapped to other systems owing to the growing demand for frequencies, especially in civil aviation, which is witnessing a constant increase in air traffic. This will affect the performance of Link-16. Therefore, in this paper, we analyze the effect of frequency band reduction on the performance of Link-16 waveform under partial-band noise jamming with Nakagami fading, via simulation and numerical analysis. The multi-net and anti-jamming performance of Link-16 with frequency remapping is compared with that of conventional Link-16 systems. The results show that the performance of Link-16 waveform is degraded with the reduction in frequencies. Nonetheless, Link-16 retains its jam resistance, and it can support multiple users in the same time slots.

Analyzing Materials Property using Optical Sensing Technique of Stabilizer Link for Automobile Parts (수송기계용 Stabilizer Link의 광센서를 이용한 부품성능평가)

  • Nam, K.W.;Woo, Y.M.;Oh, J.H.;Moon, C.K.
    • Journal of the Korea Society For Power System Engineering
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    • v.14 no.6
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    • pp.47-53
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    • 2010
  • A stabilizer link connects the stabilizer bar to the lower arm of the suspension. When a vehicle is turning, lateral forces from the tire are transmitted through the stabilizer link into the stabilizer bar. The stabilizer bar will twist, thus adding rigidity to the vehicle body. In this study, the stabilizer link body was manufactured by using composite material with POM-GF25%. Therefore, the strength evaluation of stability link body with composite material carried out from tensile, wear and fatigue test. The tensile strength between the stability link body with composite material and the rod with knurling was the largest of four types of rod. In Analyzing materials property using optical sensing technique of stabilizer link for automobile parts, its has been identified the safety.