• Title/Summary/Keyword: IT/IS Alignment

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The Road Alignment Optimization Modelling of Intersection Based on GIS (GIS를 이용하여 교차로를 고려한 도로선형 최적화 모델링)

  • 김동하;이준석;강인준
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2003.10a
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    • pp.341-345
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    • 2003
  • This study develops modeling processes for alignment optimization considering characteristics of intersections using genetic algorithms and GIS for road alignment optimization. Since existing highway alignment optimization models have neglected the characteristics of intersections, they have shown serious weaknesses for real applications. In this paper, intersection costs include earthwork, right-of-way, pavement, accident, delay and fuel consumption costs that are sensitive and dominating to alignments. Also, local optimization of intersections for saving good alignment alternatives is developed and embedded. A highway alignment is described by parametric representation in space and vector manipulation is used to find the coordinates of intersections and other interesting points. The developed intersection cost estimation model is sufficiently precise for estimating intersection costs and eventually enhancing the performance of highway alignment optimization models. Also, local optimization of intersections can be used for improving search flexibility, thus allowing more effective intersections. It also provides a basis for extending the alignment optimization from single highways to networks. The presented two artificial examples show that the total intersection costs are substantial and sensitive to highway alignments.

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A Study on Spacecraft Alignment Measurement with Theodolite (데오도라이트를 이용한 위성체 얼라인먼트 측정에 관한 연구)

  • 윤용식;이동주
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.6
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    • pp.64-70
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    • 2003
  • A measurement of spacecraft alignment is an important process of spacecraft assembly, integration and test because it is necessary that a ground station controls the precise positions of on-orbit spacecraft by using the alignment data of attitude orbit control sensors(AOCS) on spacecraft. In addition, accuracy of spacecraft alignment requirement is about $0.1^{\circ}$~$0.7^{\circ}$. The spacecraft alignment is measured by autocollimation of theodolite. This paper describes the measurement principle and method of spacecraft alignment. The result shows that all of the AOCS on the spacecraft are aligned within the tolerance required through the alignment measurement.

A Study on the Development of Automatic Measuring System on the Alignment Offset of the Vertical Multistage Shaft (수직형 다단축의 축 정열 오프셋 자동 측정시스템 개발)

  • Park, H.C.;Kim, M.Y.;Lee, H.
    • Journal of KSNVE
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    • v.8 no.5
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    • pp.922-928
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    • 1998
  • This paper presents the automatic alignment measuring system for improving the accuracy and working time of alignment of large vertical hydraulic pump turbine. It is general practice that rotating shaft should run within acceptable vibration limit. In order to obtain better run-out data of multi-stage rotor, careful and accurate alignment approach must be established. Generally, present alignment procedure are required several iterative works and so many manpower. Therefore, the new system has been developed using a vector calculation algorithm, laser sensor and data acquisition devices. As a result of appling to actual machines, it is confirmed that manpower is saved up to an average 90%.

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Self-Alignment/Navigation Performance Analysis in the Accelerometer Resonance State Generated by Dither Motion of Ring Laser Gyroscope in Laser Inertial Navigation System (레이저 관성항법장치에서 링레이저 자이로 디더 운동에 의한 가속도계 공진이 자체 정렬/항법 성능에 미치는 영향 분석)

  • Kim, Cheonjoong;Lim, Kyungah;Kim, Seonah
    • Journal of the Korea Institute of Military Science and Technology
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    • v.24 no.6
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    • pp.577-590
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    • 2021
  • In this paper, we theoretically analyzed the self-alignment/navigation performance in the accelerometer resonance state generated by dither motion of ring laser gyroscope in LINS and verified it through simulation. As a result of analysis, it is confirmed that the amplitude of the accelerometer measurement amplified in the accelerometer resonance state is decreased in the process of sampling per the navigation calculation period and that frequency is changed by the aliasing effect too. It was also analysed that the attitude error in self-alignment is determined by the amplitude/frequency of the accelerometer measurement, the gain of the self-alignment loop, and the velocity and position error in the navigation is determined by the amplitude/frequency/phase error of the accelerometer measurement. This analysis and simulation results show that the self-alignment and navigation performance is not be degraded only when the amplification factor of the accelerometer measurement in the accelerometer resonance state is 3 or less

Measurement and Correction of PCB Alignment Error for Screen Printer Using Machine Vision (1) (머신비전을 이용한 PCB 스크린인쇄기의 정렬오차측정 및 위치보정 (1))

  • 신동원
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.6
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    • pp.88-95
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    • 2003
  • This paper presents the measurement and correction method of PCB alignment errors for PCB screen printer. Electronic equipment is getting smaller and yet must satisfy high performance standard. Therefore, there is a great demand for PCB with high density. However conventional PCB screen printer doesn't have enough accuracy to accommodate the demand fur high-resolution circuit pattern and high-density mounting capacity of electronic chips. It is because the alignment errors of PCB occur when it is loaded to the screen printer. Therefore, this study focuses on the development of the system which is able to measure and correct alignment errors with high-accuracy. An automatic optical inspection part measures the PCB alignment errors using machine vision, and the high-accuracy 3-axis stage makes correction for these errors. This system used two CCD cameras to get images of two fiducial marks of PCB. The geometrical relationship between PCB, cameras, and xy$\theta$ stage is derived, and analytical equations for alignment errors are also obtained. The unknown parameters including camera declining angles and etc. can be obtained by initialization process. Finally, the proposed algorithm is verified by experiments by using test bench.

Performance Analysis in Disturbance on Initial Alignment of Laser Inertial Navigation System Using Unscented Kalman Filter (UKF를 적용한 레이저 관성항법장치의 외란에 대한 초기정렬 성능분석)

  • Oh, Juhyun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.17 no.4
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    • pp.537-543
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    • 2014
  • RLG(Ring Laser Gyroscope) is a main device of LINS(Laser Inertial Navigation System). RLG has the lock-in region in which there is no output signal. To alleviate the lock-in problem, a mechanical oscillation, the dither motion, is applied on RLG. A LPF(Low Pass Filter) is usually used on the output of RLG and accelerometer to remove the noise that is made by the dither motion. When the LINS is induced the disturbance during the initial alignment, it takes more time on alignment due to the use of the LPF and a fixed gain controller. In this paper, an initial alignment using UKF(Unscented Kalman Filter) is designed and analysed. Analysis include comparison between conventional initial alignment loop using fixed gain type controller and proposed initial alignment using UKF. Moreover, Disturbance inducing test results are demonstrated.

The Effects of MAIS Strategic Alignment on Production Performance: The Consideration of AMT (생산기술 첨단화에 따른 관리회계정보시스템 전략적 연계가 생산성과에 미치는 영향)

  • Choe, Jong-Min
    • The Journal of Information Systems
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    • v.26 no.2
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    • pp.25-42
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    • 2017
  • Purpose This study empirically examined the causal relationships among the level of advanced manufacturing technology(AMT), facilitation of alignment, the degrees of strategic alignment of management accounting information systems(MAIS), and the improvement of production performance. Design/methodology/approach Data for this study were drawn from a survey of the current status of AMT used in Korean manufacturing firms. At the beginning, 131 organizations responded to the request for information. However, during the survey, 5 firms withdrew from the survey, and as a result, 126 manufacturing firms were included in the research. In order to collect data, this study administered questionnaires with the participating firms. The survey was conducted during a 4-month period between November 2015 and March 2016. Findings The results showed that the level of AMT has a significant impact on alignment facilitation. A significant causal relationship between alignment facilitation and MAIS strategic alignment was also found. It was shown that under high degrees of MAIS strategic alignment, MAIS must provide broad-scope and integrated types of information. The causal relationships between MAIS strategic alignment and organizational performance were significant and positive. Thus, it is concluded that under high levels of AMT, a high degree of MAIS strategic alignment positively contributes to the improvement of a firm's production performance.

A Case Study on Strategic Alignment for e-Transformation of Pulmuone (e-Transformation을 위한 풀무원의 전략적 연계 사례연구)

  • Yoon, Cheol-Ho;Kim, Sang-Hoon
    • Information Systems Review
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    • v.7 no.2
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    • pp.183-194
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    • 2005
  • This study validated the strategic alignment approach for e-Transformation of the traditional firm through the case analysis of e-Transformation practices performed in Pulmuone Inc., which had been managed and operated in a traditional mode. The e-Transformation approach identified in this study was focused upon the strategic alignment among 4 domains of business strategy, organizational infrastructure and processes, IT strategy, and IT infrastructure and processes, and was performed in the following process: 1) developing IT strategy to perform business strategy, 2) building IT infrastructure and processes to support IT strategy, and then 3) transforming organizational infrastructure and processes based on IT infrastructure and processes. The theoretical implication of this study is to empirically verify the Strategic Alignment Model hypothesized by Henderson and Venkatraman(1994) through the case analysis on e-Transformation of Korean traditional firm, and the practical contribution is to provide a feasible and effective guideline in carrying out e-Transformation of the typical traditional organization.

Measurement Time-Delay Error Compensation for Transfer Alignment (전달정렬의 측정치 시간지연 오차보상 기법)

  • Lim, You-Chol;Song, Gi-Won;Lyou, Joon
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.11
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    • pp.953-957
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    • 2001
  • This paper is concerned with a transfer alignment method for the SDINS under ship motions. Major error sources of transfer alignment are data transfer time-delay, lever-arm velocity and ship body flexure. Specifically, to reduce alignment errors induced by measurement time-delay effects, the error compensation method through delay state augmentation is suggested. A linearized error model for the velocity and attitude matching transfer alignment system is first derived by linearizing the nonliner measurement equation with respect to its time delay and augmenting the delay state into the conventional linear state equations. And then it is shown via observability analysis and computer simulations that the delay state can be estimated and compensated during ship motions resulting in considerably less alignment errors.

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A Analysis of Highway′s Horizontal Alignment Using Kinematic GPS Surveying (동적 GPS 관측에 의한 도로의 평면선형 분석)

  • 이종출
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.19 no.1
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    • pp.39-45
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    • 2001
  • The design of highway in the future should be convenient using of a high-technology information, and it needs the design of alignment that is able to find the maximum vehicles inducement function fitting into Car Navigation System. Well then, the alignment of the existent highway needs to be analyzed with accuracy for improving design of existent highway, and it needs the design drawing of existent highway, and coordinates of the main point. This study gets data of the alignment of highway economically by Kinematic GPS surveying to analyze the alignment of existent highway, and horizontal alignment of highway is analyzed by this data. The result of study is included within range practical error, and alignment analysis can be known that there is practical.

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