• Title/Summary/Keyword: Network adjustment

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A Reliability Analysis of Free- Network Adjustment in the Deformation Surveying. (변형측량에서 자유망조정기법의 신뢰성 분석)

  • 유복모;정영동;이석군
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.5 no.2
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    • pp.56-64
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    • 1987
  • The concept of standard error ellipse and confidence ellipse is vtilized in the detection of displaced station which are uncluded in the observational network. In this paper, the influences on the accuracy of unknown stations according to the varied selection and geometrical conditions of fixed stations were evaluated. And then the displaced stations were detected by error ellipse concept, and the amounts of displacement were determined by coordinate differences between epochs which were calculated by fixed point adjustment and free network adjustment. As a result, it is found that the free network adjustment is more efficient in the detection and displacement calculation of displaced stations.

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Adjustment of 1st order Level Network of Korea in 2006 (우리나라 1등 수준망 조정(2006년))

  • Lee, Chang-Kyung;Suh, Young-Cheol;Song, Chang-Hyun;Jeon, Bu-Nam
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2007.04a
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    • pp.7-10
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    • 2007
  • The 1st order vertical network of Korea was adjusted in 1987 at first time. This is the second adjustment of the 1st order vertical network of Korea by National Geographic Information Institute. All the levelling data were acquired by digital level with invar staff. The number of 1st order level lines are 36, and 34 level lines comprise 11 circles of level network. Backward and forward error of a few level lines are larger than the regulations of NGII, Korea. Also, 3 circles of vertical network has circuit closure error that is exceed the regulation. As the result of 1st order vertical network adjustment, the reference standard error of the vertical network was $1.8mm/{\surd}km$.

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Free Network Adjustment by Application of Generalized Inverse (일반역행예을 이용한 자유망조정)

  • 정영동;강태석;박상진;김욱남
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.3 no.2
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    • pp.48-62
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    • 1985
  • A method for the free network adjustment is proposed, based on the application of generalized inverse matrix (g-inverse). If the network adjustment is executed according to the solution with parameters, especially when all coordinates are considered as parameters to keep unity strength, the matrix of normal equation will be singular. This paper discusses the problem of singular matrix and the analysis of accuracy between conventional method and the free network adjustment of trilateration. In case of the adjustment, the RMS errors of adjusted X, Y coordinates are increased to 35.6% in a polygon, central-point figure, and 50.5% in a quadrilateral. In the elements of error ellipse, the RMS errors are decreased by $\pm$24.5% (a) and $\pm$5.0 % (b) in the polygon, $\pm$42.6% (a) and $\pm$49.2% (b) in the quadrilateral. Introduction of free network adjustment, therefore, could be applied to improvement of relative accuracy in the horizontal positioning.

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Examination and Evaluation of Results of the National Wide Horizontal Network Adjustment (국가기준점 망조정의 점검 및 평가)

  • Lee, Young-Jin;Choi, Yun-Soo;Kwon, Jay-Hyoun;Lee, Hung-Kyu
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2007.04a
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    • pp.43-46
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    • 2007
  • This paper focuses on examining and evaluating recent results of the national wide horizontal network adjustment which has carried out with respect to the Korean Geodetic Datum 2002 (KGD2002). To do this, 137 geodetic control points were observed by modem GPS technology. After processing all the observations, their outcomes are compared with ones provided by the national wide network adjustment. Results of GPS network show that RMSE is ${\pm}2.7cm\;and\;{\pm}6.5cm$ in horizontal and vertical component, respectively. On the other hand, ones from comparison with EDM network indicate that RMSE is ${\pm}3.0cm$ in horizontal component.

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Automatic adjustment of feedforward signal in boiler controllers of thermal power plants

  • Egashira, Katsuya;Nakamura, Masatoshi;Eki, Yurio;Nomura, Masahide
    • 제어로봇시스템학회:학술대회논문집
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    • 1995.10a
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    • pp.83-86
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    • 1995
  • This paper proposes an auto-tuning method of feedforward signal in boiler control of thermal power plants by using the neural network. The neural network produces an optimal feedforward signal by tuning the weights of the network. The weights are adapted effectively by using the teaching signal of PI control output. The proposed method was evaluated based on a detailed simulator which expressed non-linear characteristics of the 600 MW actual thermal power plant at load chaning operations, showed effectiveness in the learning of the weights of the neural network, and gave an accurate control performance in the temperature control of the system. Through the evaluation, the proposed method was proved to be effectively applicable to the actual thermal plants as the automatic adjustment tool.

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A Study on Simultaneous Adjustment of GNSS Baseline Vectors and Terrestrial Measurements

  • Nguyen, Dinh Huy;Lee, Hungkyu;Yun, Seonghyeon
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.38 no.5
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    • pp.415-423
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    • 2020
  • GNSS (Global Navigation Satellite System) is mostly used for high-precise surveys due to its accuracy and efficiency. But this technique does not always fulfill the demanding accuracy in harsh operational environments such as urban canyon and forest. One of the remedies for overcoming this barrier is to compose a heterogeneous surveying network by adopting terrestrial measurements (i.e., distances and angles). Hence, this study dealt with the adjustment of heterogeneous surveying networks consisted of GNSS baseline vectors, distances, horizontal and vertical angles with a view to enhancing their accuracy and so as to derive an appropriate scheme of the measurement combination. Reviewing some technical issues of the network adjustments, the simulation, and experimental studies have been carried out, showing that the inclusion of the terrestrial measurements in the GNSS standalone overall increased the accuracy of the adjusted coordinates. Especially, if the distances, the horizontal angles, or both of them were simultaneously adjusted with GNSS baselines, the accuracy of the GNSS horizontal component was improved. Comparing the inclusion of the horizontal angles with those of the distances, the former has been more influential on accuracy than the latter even though the same number of measurements were employed in the network. On the other hand, results of the GNSS network adjustment together with the vertical angles demonstrated the enhancement of the vertical accuracy. As conclusion, this paper proposes a simultaneous adjustment of GNSS baselines and the terrestrial measurements for an effective scheme that overcomes the limitation of GNSS control surveys.

An Application of Neural Ntwork For the Adjustment Process during Electronics Production (전자제품 생산의 조정공정을 위한 신경회로망 응용)

  • 장석호;정영기;감도영;우광방
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.310-313
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    • 1996
  • In this paper, a neural control algorithm is proposed on the automation of adjustment process. The adjustment processes in camcoder production line are modelled, and the processes are adjusted automatically by means of off-line supervisory trained multi-layer neural network. We have made many experiments on the several adjustment processes by using the control algorithm. There are many unexpected troubles to achieve the desirable adjust time in the practical application. To overcome those, some auxiliary algorithms are demanded. As a result, our proposed algorithm has some advantages - simple architecture, easy extraction of the training data without expertises, adaptability to the varying systems, and wide application for the other resemble processes.

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The Relationship of Self Efficacy and Social Support to the Psychosocial Adjustment in People with Epilepsy (간질환자의 사회심리적 적응과 자기효능.사회적 지지와의 관계 연구)

  • 문성미
    • Journal of Korean Academy of Nursing
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    • v.30 no.3
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    • pp.694-708
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    • 2000
  • The main purpose of this study was to identify the relationship of self efficacy and social support to the psychosocial adjustment in people with epilepsy. Data were collected from October 1 to October 15, 1999 from 101 people with epilepsy who were being treated regularly at one of the university hospitals located in Seoul. The research instruments were a questionnaire to gather demographic and disease-specific data, the Epilepsy Psycho- Social Effects Scale developed by Chaplin et al(1990), the Epilepsy Self Efficacy Scale developed by DiIorio et al(1992a) and translated by Park(1999), the Norbeck Social Support Questionnaire developed by Norbeck et al(1981) and translated by Oh(1985). Data were analyzed using the SPSS program. The results are as follow : 1. Of the 14 psychosocial adjustment areas, 75 of 101 subjects experienced problems in ten or more areas and 28 in all 14 areas. The severity of the psychosocial adjustment problem was moderate or more in six areas. 2. The score for self efficacy was an average of 1103.86 out of a possible 1800, for social support 117.57 for total functional out of a possible 720, and 48.21 for total network out of a possible 264. There were an average of five people on the network. The main network people were parents, brothers and sisters, spouse, friends. 3. Of the 14 psychosocial adjustment areas, six areas correlated with self efficacy and 'problems with taking medication' area had a negative correlation with social support. In conclusion, people with epilepsy have various problems in psychosocial adjustment. Nursing interventions using self efficacy should be developed to improve psychosocial adjustment in people with epilepsy. Also, instruments and interventions for regimen-specific supports which are suitable for epilepsy should be developed.

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Simultaneous Adjustment and Reliability Application in Heterogeneous Network (이질측지망의 동시조정과 신뢰도의 적용)

  • 이석찬;조규전;고영호;이영진
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.5 no.1
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    • pp.66-72
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    • 1987
  • It is well known that a triangulateration net is superior to a trilateration net or triangulation net in a same configuration. In general, to explain this nature is not easy because the large residuals and reference variance are revealed in the adjustment of a heterogeneous network. In this paper the precision and the reliability of network are discussed, and the considerations of simultaneous adjustment are covered A practical example shows that the concept and criteria of reliability give better estimate than the precision in heterogeneous network.

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Time-Cost Trade-Off by Lead-Time Adjustment in the PDM Network

  • Kim, Seon-Gyoo
    • Architectural research
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    • v.11 no.2
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    • pp.43-49
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    • 2009
  • Since the late 1980s, the schedule technique applied to the construction industry around the world has rapidly changed from the traditional ADM (Arrow Diagramming Method) to the PDM (Precedence Diagramming Method) technique. The main reason for this change is to overcome the limits and inconveniences of the traditional ADM technique. The time-cost trade-off is one of the core scheduling techniques to establish the best optimized combination plan in terms of a relationship between the cost and schedule. However, most of the schedule-related textbooks and research papers have discussed and proposed applications of a time-cost trade-off technique based only on the Finish to Start relationship. Therefore, there are almost no consideration and discussion of problems or restrictions that emerge when the time-cost trade-off technique is applied to the PDM network that has overlapping relationships. This paper proposes the lead-time adjustment method as a methodology for overcoming some restrictions that are encountered when the time-cost trade-off technique is applied to the overlapping relationships of the PDM network.