• Title/Summary/Keyword: Target configuration

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A Study on Measurement Accuracy of A Theodolite System(V) - A Measurement System Accuracy depending on the distance from theodolite system to target Bars (데오드라이트 시스템의 측정 정확도에 대한 연구(V) - 타켓 바의 거리에 따른 측정 정확도)

  • Yoon Yong-Sik;Lee Dong-Ju
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.14 no.4
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    • pp.13-21
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    • 2005
  • The affected factors for an accuracy of theodolite system are not only the measurement environment of temperature, illumination, etc. but also the measurement processes of the distance between two theodolites, the distance from theodolite system to scale bar and the distance from theodolite system to targets. We have known that the best collimation distance between two theodolites and the best distance from theodolite system to scale bar is $3{\sim}4m$. This study was performed for searching the best distance from theodolite system to targets on above measurement configuration. And, we could know that the best distance from theodolite system to targets is $2{\sim}6m$ and the system accuracy could be within ${\pm}0.025mm$.

A Study on the Hopfield Neural Scheme for Data Association in Multi­Target Tracking (다중표적추적용 데이터 결합을 위한 홈필드 신경망 기법 연구)

  • Lee, Yang­-Weon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.7 no.8
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    • pp.1840-1847
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    • 2003
  • In this paper, we have developed the MHDA scheme for data association. This scheme is important in providing a computationally feasible alternative to complete enumeration of JPDA which is intractable. We have proved that given an artificial measurement and track's configuration, MHDA scheme converges to a proper plot in a finite number of iterations. Also, a proper plot which is not the global solution can be corrected by re­initializing one or more times. In this light, even if the performance is enhanced by using the MHDA, we also note that the difficulty in tuning the parameters of the MHDA is critical aspect of this scheme. The difficulty cat however, be overcome by developing suitable automatic instruments that will iteratively verify convergence as the network parameters vary.

The Development Plan on Urban Transit System Standard of RAMS based (RAMS기반의 도시철도시스템 표준규격 개발방향 연구)

  • Lee, Woo-Dong
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1179-1180
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    • 2007
  • Urban transit is system that offer target Performance and function because various lower part system such as vehicles, signaling, power supply, rail track is consisted as complex. It is important first of all that describe correctly system requirement until configuration of system, design, manufacture, installation and test verification so that the complicated urban transit system is to act safety and reliable and to display target Performance and function properly. The system requirement assist the system developer to comprehensive the performance and function of system in basic design. Therefore, In this paper wishes to study way to analyze system of system requirement and apply to Urban transit.

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The Propose to the System Requirement Structure of Rolling Stock System (도시철도 차량시스템 요구사항체계 구축방안에 관한 연구)

  • Lee, Woo-Dong
    • Proceedings of the KIEE Conference
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    • 2005.10c
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    • pp.296-298
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    • 2005
  • Urban transit is system that offer target Performance and function because various lower part system such as vehicles, signaling, power supply, rail track is consisted as complex. It is important first of all that describe correctly system requirement until configuration of system, design, manufacture, installation and test verification so that the complicated urban transit system is to act safety and reliable and to display target Performance and function properly. The system requirement assist the system developer to comprehensive the performance and function of system in basic design. Therefore, In this paper wishes to study way to analyze system of system requirement and apply to Urban transit.

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Omni Scanning DPCA using Two Passive Antennas with Vertical Separation

  • Kim Man-Jo;Kho Bo-Yeon;Yoon Sang-Ho
    • Korean Journal of Remote Sensing
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    • v.22 no.3
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    • pp.229-234
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    • 2006
  • In tactical theater, it is crucial to detect ground moving targets and to locate them precisely. This problem can be resolved by using SAR (Synthetic Aperture Radar) sensors providing GMTI (Ground Moving Target Indication) capability. In general, to implement a robust GMTI sensor is not simple because of the strong competitions between target signals and clutter signals from the ground, and low speed of moving targets. Contrary to the case that a delay canceller is mostly suitable for ground surveillance radars, DPCA (Displaced Phase Centered Antenna) or STAP (Space Time Adaptive Processing) techniques have been widely adapted for GMTI function of modern airborne radars. In this paper, a new scheme of DPCA using two passive antennas with vertical separation is proposed, which also provides good clutter cancellation performance. The proposed scheme realizes full azimuth coverage for DPCA operation on an airborne platform, which is impossible with classical DPCA configuration. Simulations using various conditions have been performed to validate the proposed scheme, and the results are acceptable.

Engagement-Scenario-Based Decoy-Effect Simulation Against an Anti-ship Missile Considering Radar Cross Section and Evasive Maneuvers of Naval Ships

  • Kim, Kookhyun
    • Journal of Ocean Engineering and Technology
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    • v.35 no.3
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    • pp.238-246
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    • 2021
  • The survivability of a naval ship is the ability of the ship and its onboard systems to remain functional and continue a designated mission in man-made hostile environments. A passive decoy system is primarily used as a weapon system for improving the survivability of a naval ship. In this study, an engagement scenario-based simulation program was developed for decoy effectiveness assessments against an anti-ship missile (ASM), which tracks a target with sea-skimming and active radar homing. The program can explain the characteristics of a target ship, such as the radar cross section and evasive maneuvers, as well as the operational performance of the onboard decoy system, the guidance method of the ASM, and the engagement environment's wind speed and direction. This paper describes the theory and formulations, configuration, and user interface of the developed program. Numerical examples of a decoy effect assessment of a virtual naval ship against an ASM are presented.

Determining of the Sampling Time and Adjusting PID Coefficients in a Discrete System (이산 시스템에서 샘플링 시간의 설정 및 PID 계수 조정)

  • Choi, Goon-Ho
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.4
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    • pp.46-51
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    • 2017
  • Recent controller design techniques often discretize the target system and implement a discrete controller that is digitized to match the target system. When constructing such a discrete system, it is necessary to first determine the sampling time. The smaller the sampling time is, the more advantageous it can be made similar to the original system, but the cost is a problem when realizing such a configuration as hardware. On the other hand, the longer the time, the more different the system is from the original system, and eventually the control becomes impossible. In this paper, we consider the above problem and propose a more logical approach to determine the sampling time in the discrete system and investigate the relation with the differential controller. We also apply this process to a nonlinear system called ARAGO disc and verify its validity through computer simulation.

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Feature Configuration Validation using Semantic Web Technology (시맨틱 웹 기술을 이용한 특성 구성 검증)

  • Choi, Seung-Hoon
    • Journal of Internet Computing and Services
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    • v.11 no.4
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    • pp.107-117
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    • 2010
  • The feature models representing the common and variable concepts among the software products and the feature configurations generated by selecting the features to be included in the target product are the essential components in the software product lines methodology. Although the researches on the formal semantics and reasoning of the feature models and feature configurations are in progress, the researches on feature model ontologies and feature configuration validation using the semantic web technologies are yet insufficient. This paper defines the formal semantics of the feature models and proposes a feature configuration validation technique based on ontology and semantic web technologies. OWL(Web Ontology Language), a semantic web standard language, is used to represent the knowledge in the feature models and the feature configurations. SWRL(Semantic Web Rule Language), a semantic web rule languages, is used to define the rules to validate the feature configurations. The approach in this paper provides the formal semantic of the feature models, automates the validation of feature configurations, and enables the application of various semantic web technologies, such as SQWRL.

A Study on the Audit Model of Outsourcing Operation based on Availability Metrics in perspective of Service Level Agreenment (서비스 수준협약 관점에서 가용성 지표 중심의 아웃소싱 운영감리 모델에 관한 연구)

  • Kim, Dong-Soo;Kim, Hee-Wan
    • Journal of Digital Convergence
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    • v.13 no.7
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    • pp.183-196
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    • 2015
  • In order to perform a successful outsourcing, we needs the SLA through improving the quality of IT services. In particular SLA metrics and evaluation criteria is an important factor as to substitute the IT viability of the company to promote IT Outsourcing. SLA metrics consist of technical, managerial, user perspective items, and has been managed to aim to provide reliable and continuous quality improvement of IT services. This study focuses on the HW availability metrics of SLA indicators of IT outsourcing. We propose the Infra availability criteria for the HW configuration level to meet the SLA contract and evaluation. We offer the Infra configuration standards of SLA contract, and propose criteria to determine the suitability of the target levels in IT operations audit environment. The proposed model was verified the necessity and effectiveness of the Infra configuration standards and operation audit check items through the surveys of experts and users.

Study of Integrated-Flight M&S Application for the Anti-Tank Missile Configuration Design (대전차 유도무기의 형상 설계에서의 통합비행 M&S 적용 연구)

  • Jeong, Dong Gil;Kim, Sangman;Lee, Gunha;Hwang, Cheol Gyu
    • Journal of the Korea Society for Simulation
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    • v.26 no.1
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    • pp.13-19
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    • 2017
  • 6-DOF flight simulation program is most generally used M&S tool in domestic missile development procedure. The 6-DOF M&S method, however, cannot validate the performance of a imaging seeker-adopted missile in various conditions. A M&S tool for the analysis of the integrated-flight simulation is required since the tracking performance of the imaging seeker is highly dependent on the missile maneuvering, which introduces the displacement and rotation of the target in the seeker imagery. Through the development of the $3^{rd}$ generation anti-tank missile, Raybolt, the integrated-flight M&S tool was developed and applied to the missile configuration design. It integrates synthetic image generation S/W, imaging tracker, and flight simulation program and computes the main system performance criteria, hit probability by Monte-Carlo Simulation. In this paper, the issues in the $3^{rd}$ generation anti-tank missile configuration and the integrated-flight M&S method and results are described.