• Journal of Institute of Control, Robotics and Systems
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• v.2 no.2
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• pp.102-107
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• 1996

It is difficult to analyze the high speed rolling missile with the generally used missile body fixed coordinates. In this study, we formulate the dynamic equations of the high speed rolling missile with the principal axis of inertia, and make the analytical model of one axis steering missile using pitch/yaw symmetry and complex summation method. With this model we analyze the control characteristics and propose the design considerations of high speed rolling missile with one axis control fin using PNG law in conjuntion with a seeker signal.

• Journal of Institute of Control, Robotics and Systems
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• v.14 no.8
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• pp.740-744
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• 2008

In this paper, we propose a new time-to-go estimation filter for PN guided missiles. The proposed estimator is derived based on the approximation of the length of the PNG homing trajectory that we newly introduced using the special coordinate system. The coordinate system is convenient for taking the target movement into account. In addition, compared with the previous time-to-go estimation techniques, the parameters required for evaluating the length can be obtained only with the seeker measurements. Moreover, the seeker measurement error statistics can effectively be considered since our filter is derived based on the Kalman filter theory. Simulation result for a typical anti-ship see-skimming missile homing trajectory shows the excellent performance of the proposed filter.

• Journal of Institute of Control, Robotics and Systems
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• v.8 no.1
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• pp.60-66
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• 2002

In this paper, a new target pointing guidance algorithm is proposed by combining the optimal target pointing solution and a simple time-to-Go estimator. Also investigated are some properties of the guidance algorithm which include a relation to conventional PNG, convergence region and convergence trajectories of error states according to the time-to-go estimator gain. Some guidelines for designing the pointing guidance law are commented based on the convergence properties. A design example in the case of large initial heading errors is presented and its performance is investigated by simulation.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.72-76
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• 2011

본 연구는 레이더 강우 영상에서 추출된 강우 패턴을 인공신경망으로 처리하여 단기 강우 예측을 수행하는 방안을 제시한 것이다. 본 연구에 활용한 CAPPI 영상자료로는 편차 보정과 품질 관리가 이루어지고 있으며 획득이 용이한 기상청 자료를 이용하였으며 CAPPI의 PNG 영상으로부터 강우 패턴을 추출하고, 이를 역전파 알고리즘의 인공신경망 강우 예측 모형에 학습시켜 단기 강우를 예측하기 위한 절차를 제시하였다. 이를 위하여 강우의 시공간적 변화 패턴 추출을 위한 영상 처리와 GIS 자료처리 기법을 제시하였고 이를 인공신경망의 단기 강우 예측 학습과 검증에 적용하여 본 연구에서 제시된 기법의 타당성을 검토하였다.

• Journal of the Korean Wood Science and Technology
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• v.8 no.2
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• pp.9-16
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• 1980

The problem of tauns having the characteristics of severe variations in quality and unequally distributed moisture content in veneer sheets after drying for plywood could be cured to a proper even moisture distribution by the peeling of veneers in a prolonged period. The poor gluability of tauns was improved by applicaton of increased resin content of glue in spreading. Combinations of tauns with lauan and kapur for plywood showed good shear strength.

• Journal of Institute of Control, Robotics and Systems
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• v.16 no.2
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• pp.177-187
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• 2010

A MTG (Multimode Tracking and Guidance) system is employed to compensate for the limitations of individual seekers such as RF (Radio frequency) or IIR (Imaging Infra-red) and to improve the overall tracking and guidance performance in jamming, clutter, and adverse weather environments. In the MTG system, tracking filter, data association, and data fusion methods are important elements to maximize the effectiveness of precision homing missile guidance. This paper proposes the formulation of a Kalman filter for the estimation of line-of-sight rate from seeker measurements in missiles guided by proportional navigation. Also, we suggest the HPDA (Highest Probability Data Association) and data fusion methods of the MTG system for target tracking in the adverse environments. Mont-Carlo simulation is employed to evaluate the overall tracking performance and guidance accuracy.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.159-162
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• 2001

기존 감시 시스템은 제약된 공간내에서 감시 할 수 있어 보안 인력의 낭비와 고가의 시스템 설치비용이 소모된다. 이런 한계를 넘어 언제 어디서든지 필요에 따라 모바일 디바이스로 감시 서버에 접속하여 지정된 장소의 상황을 확인 할 수 있는 시스템을 구현하였다. 본 무선인터넷 기반 감시 시스템은 SKT-Service API 를 탑재하였고 삼성전자 SCH-X35O 무선단말기에 적용하였으며 PNG 파일 포멧을 적용하였으며 우수한 성능을 나타내었다.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• v.19 no.3
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• pp.253-270
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• 2015

Two major simultaneous attack strategies have been introduced, as one of cooperative attack of multiple missiles. One strategy is an undesignated time attack, in which the missiles communicate among themselves to synchronize the arrival times by reducing the mutual differences of times-to-go of multiple missiles during the homing. The other is a designated time attack, in which a common impact time is commanded to all members in advance, and thereafter each missile tries to home on the target on time independently. For this individual homing, Impact-Time-Control Guidance (ITCG) law is required. After introducing cooperative proportional navigation (CPN) for the first strategy, this article presents a new closed-form ITCG guidance solution for the second strategy. It is based on the linear formulation, employing base trajectories driven by PNG with various navigation constants. Nonlinear simulation of several engagement situations demonstrates the performance and feasibility of the proposed ITCG law.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.743-744
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• 2023

타브(TAB) 악보는 주로 현악기에서 쓰이는 악보로, 일반적으로 생각하는 오선보 대신 악기의 줄 수만큼 선을 긋고 그 선 위에 프렛의 위치를 숫자 또는 문자로 표기한 형식의 악보이다. 본 논문에서는 입력된 PDF 형식의 타브 악보에서 OpenCV 를 사용하여 음표 및 악상 기호를 인식하는 시스템을 제안한다. 이 시스템은 사용자가 인식을 원하는 PDF 형식의 악보를 입력하면 PDF 파일을 PNG 파일로 변경한 뒤, 이를 OpenCV 를 활용하여 음표의 길이, 프렛의 위치 등 연주에 필요한 요소들만 객체 검출한 뒤 Tesseract 로 인식한다.

• Korean Journal of Remote Sensing
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• v.36 no.3
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• pp.475-486
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• 2020

Climate change scenarios are the basis of research to cope with climate change, and consist of large-scale spatio-temporal data. From the data point of view, one scenario has a large capacity of about 83 gigabytes or more, and the data format is semi-structured, making it difficult to utilize the data through means such as search, extraction, archiving and analysis. In this study, a tool for analyzing extreme climate events based on spatial information is developed to improve the usability of large-scale, multi-period climate change scenarios. In addition, a pilot analysis is conducted on the time and space in which the heavy rain thresholds that occurred in the past can occur in the future, by applying the developed tool to the RCP8.5 climate change scenario. As a result, the days with a cumulative rainfall of more than 587.6 mm over three days would account for about 76 days in the 2080s, and localized heavy rains would occur. The developed analysis tool was designed to facilitate the entire process from the initial setting through to deriving analysis results on a single platform, and enabled the results of the analysis to be implemented in various formats without using specific commercial software: web document format (HTML), image (PNG), climate change scenario (ESR), statistics (XLS). Therefore, the utilization of this analysis tool is considered to be useful for determining future prospects for climate change or vulnerability assessment, etc., and it is expected to be used to develop an analysis tool for climate change scenarios based on climate change reports to be presented in the future.