• Title/Summary/Keyword: 궤적기반

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Bouncing Model of Spinning Ball based on Real Trajectory (실측 기반 회전공의 튐 모델)

  • Baek, Seong-Min;Kim, Myung-Gyu
    • Proceedings of the Korean Information Science Society Conference
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    • 2012.06c
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    • pp.421-423
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    • 2012
  • 본 논문에서는 빠르게 회전하는 공에 대한 바운싱 모델을 제시한다. 제안하는 바운싱 모델은 충격량을 기반으로 공의 회전력, 지면의 탄성 및 마찰력을 고려한다. 제안된 모델의 정확도를 측정하기 위해 그린, 페어웨이 및 러프 지형에서 공의 궤적을 촬영하고, 영상으로부터 공의 실제 궤적을 추출하여 비교한다. 시뮬레이션 모델은 실제 궤적을 기반으로 튜닝함으로써 정확도를 향상시킨다. 본 바운싱 모델은 실감형 스포츠 게임에서 보다 사실감을 높일 수 있다.

Similar Trajectory Retrieval on Road Networks using Spatio-Temporal Similarity (시공간 유사성을 이용한 도로 네트워크 상의 유사한 궤적 검색)

  • Hwang Jung-Rae;Kang Hye-Young;Li Ki-Joune
    • The KIPS Transactions:PartD
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    • v.13D no.3 s.106
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    • pp.337-346
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    • 2006
  • In order to analyze the behavior of moving objects, a measure for determining the similarity of trajectories needs to be defined. Although research has been conducted that retrieved similar trajectories of moving objects in Euclidean space, very little research has been conducted on moving objects in the space defined by road networks. In terms of real applications, most moving objects are located in road network space rather than in Euclidean space. In similarity measure between trajectories, however, previous methods were based on Euclidean distance and only considered spatial similarity. In this paper, we define similarity measure based on POI and TOI in road network space. With this definition, we present methods to retrieve similar trajectories using spatio-temporal similarity between trajectories. We show clustering results for similar trajectories. Experimental results show that similar trajectories searched by each method and consistency rate between each method for the searched trajectories.

Continuous Speech Recognition based on Parmetric Trajectory Segmental HMM (모수적 궤적 기반의 분절 HMM을 이용한 연속 음성 인식)

  • 윤영선;오영환
    • The Journal of the Acoustical Society of Korea
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    • v.19 no.3
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    • pp.35-44
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    • 2000
  • In this paper, we propose a new trajectory model for characterizing segmental features and their interaction based upon a general framework of hidden Markov models. Each segment, a sequence of vectors, is represented by a trajectory of observed sequences. This trajectory is obtained by applying a new design matrix which includes transitional information on contiguous frames, and is characterized as a polynomial regression function. To apply the trajectory to the segmental HMM, the frame features are replaced with the trajectory of a given segment. We also propose the likelihood of a given segment and the estimation of trajectory parameters. The obervation probability of a given segment is represented as the relation between the segment likelihood and the estimation error of the trajectories. The estimation error of a trajectory is considered as the weight of the likelihood of a given segment in a state. This weight represents the probability of how well the corresponding trajectory characterize the segment. The proposed model can be regarded as a generalization of a conventional HMM and a parametric trajectory model. The experimental results are reported on the TIMIT corpus and performance is show to improve significantly over that of the conventional HMM.

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Research/Development Trend and Technical Enablers of Trajectory-based Operations in Air Traffic Management (항공교통관리 궤적기반운용 연구 개발 동향 및 요소기술)

  • Eun, Yeonju;Jeon, Daekeun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.43 no.4
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    • pp.349-358
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    • 2015
  • The research and development trend of Trajectory-based Operations(TBO), which is considered as a key concept of future Air Traffic Management(ATM), is presented in this paper. The operational concepts of TBO in ASBU(Aviation System Block Upgrade) from ICAO(International Civil Aviation Organization) have been summarized, and the detailed operational concepts and procedures, which can be realized in the near future, are described through the investigations of operational concept development and related research/development activities of TBO in USA and Europe. The technical enablers, which have been identified based on understanding of TBO operational concepts, are introduced, and related research/development status of each technical enabler has been presented.

Objective Evaluation of Recurrent Neural Network Based Techniques for Trajectory Prediction of Flight Vehicles (비행체의 궤적 예측을 위한 순환 신경망 기반 기법들의 정량적 비교 평가에 관한 연구)

  • Lee, Chang Jin;Park, In Hee;Jung, Chanho
    • Journal of IKEEE
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    • v.25 no.3
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    • pp.540-543
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    • 2021
  • In this paper, we present an experimental comparative study of recurrent neural network based techniques for trajectory prediction of flight vehicles. We defined and investigated various relationships between input and output under the same experimental setup. In particular, we proposed a relationship based on the relative positions of flight vehicles. Furthermore, we conducted an ablation study on the network architectures and hyperparameters. We believe that this comprehensive comparative study serves as a reference point and guide for developers in choosing an appropriate recurrent neural network based techniques for building (flight) vehicle trajectory prediction systems.

Trajectory Based Air Traffic Analysis Software Design for Dynamic Airspace Configuration (동적 공역 형상관리를 위한 궤적기반 항공 교통량 분석 소프트웨어 설계)

  • Kim, Hyoun-Kyoung;Eun, Yeon-Ju;Oh, Eun-Mi
    • Aerospace Engineering and Technology
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    • v.12 no.1
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    • pp.173-181
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    • 2013
  • In this paper, the design result of the trajectory-based air traffic analysis software which is going to be used to assess air-traffic efficiency in case that some modification's made in dynamic airspace configuration, is described. The software has been developed to make statistical data about air-traffic in Incheon FIR based on the RPL, and to analyze the airway utilization and controller workload using the trajectory modeling data which are derived from the aircraft type, cruise speed, cruise altitude, and routes and fixes in the RPL. Since it batch-processes the long-term trajectory data with other inputs such as airspace, route information and so on, it has the advantage of quickly predicting the traffic variation when some change in airspace and route information is made.

Index Structure and Trajectory Data Generation Algorithm to Process the Trajectory of Moving Object (이동 객체의 궤적 처리를 위한 색인 구조 및 궤적 데이터 생성 알고리즘)

  • Chae, Cheol-Joo;Kim, Yong-Ki
    • Journal of the Korea Convergence Society
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    • v.10 no.4
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    • pp.33-38
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    • 2019
  • Recently, to support location-based services, there have been many researches which consider the spatial network. For this, there are many experimental data for data processing on the road network. However, the data to process the trajectory of moving objects are not suitable. Therefore, we propose index structure to process the trajectory data on the road network and the trajectory data generation algorithm. In addition, to prove efficiency of our index structure and algorithm, we show that edge-based trajectory data are generated through the proposed algorithm using the map data of San Francisco Bay.

KCS 선형의 파랑 중 자유항주모형시험

  • Yun, Geun-Hang;Kim, Dong-Jin;Yeo, Dong-Jin;Kim, Yeon-Gyu
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2018.11a
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    • pp.9-11
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    • 2018
  • 선박의 파랑 중 조종성능 변화를 추정하기 위하여 선박해양플랜트연구소 공학수조에서 KCS 선형의 모형선으로 파랑 중 자유항주모형시험을 수행하였다. 파향, 파고, 파장 등이 변화는 규칙파 상태에서 KCS 선형의 35도 선회시험을 수행하여 파 중 선회궤적변화를 관찰하였고, 정상선회 상태에서 속도기반 궤적밀림 지수를 계산하였다. 계산된 속도기반 궤적지수를 정수 중 초기선회 상태에 외력으로 작용하여 그 시뮬레이션 결과를 보정하고 이를 파랑 중 초기선회 성능과 비교분석하였다. 그 결과 초기 선회 중 도출되는 선회성능인 전진거리, 전술선회직경은 선수파일 경우, 모형선의 전진방향 속도 변화를 추가적으로 고려해야함을 확인하였다.

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Satellite Trajectory Correction Maneuver for Lunar Mission based on Three-Body Dynamics (달탐사 임무를 위한 3체 운동방정식 기반의 인공위성 궤적보정 기동)

  • Cho, Dong-Hyun;Jung, Young-Suk;Lee, Dong-Hun;Jung, Bo-Young;Bang, Hyo-Choong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.9
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    • pp.875-881
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    • 2010
  • During the lunar mission, spacecraft are subject to various unexpected disturbance sources such as third body attraction, solar pressure and operating impulsive maneuver error. Therefore, efficient trajectory correction maneuver (TCM) strategy must be required to follow the designed mission trajectory. In the early days of space exploration, the mission trajectory has been designed by using patched conic approach based on two-body dynamics for the lunar mission. Thus the TCM based on two-body dynamics has been usually adopted. However, with the advanced in computing power, the mission trajectory based on three-body dynamics is attempted recently. Thus, these approaches based on two-body dynamics are essentially different from real environment and large amount of energy for the TCM is required. In this work, we study the trajectory correction maneuver based on three-body dynamics.

A Signature-based Video Indexing Scheme using Spatio-Temporal Modeling for Content-based and Concept-based Retrieval on Moving Objects (이동 객체의 내용 및 개념 기반 검색을 위한 시공간 모델링에 근거한 시그니쳐 기반 비디오 색인 기법)

  • Sim, Chun-Bo;Jang, Jae-U
    • The KIPS Transactions:PartD
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    • v.9D no.1
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    • pp.31-42
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    • 2002
  • In this paper, we propose a new spatio-temporal representation scheme which can model moving objets trajectories effectively in video data and a new signature-based access method for moving objects trajectories which can support efficient retrieval on user query based on moving objects trajectories. The proposed spatio-temporal representation scheme supports content-based retrieval based on moving objects trajectories and concept-based retrieval based on concepts(semantics) which are acquired through the location information of moving objects trajectories. Also, compared with the sequential search, our signature-based access method can improve retrieval performance by reducing a large number of disk accesses because it access disk using only retrieved candidate signatures after it first scans all signatures and performs filtering before accessing the data file. Finally, we show the experimental results that proposed scheme is superior to the Li and Shan's scheme in terns of both retrieval effectiveness and efficiency.