• Title/Summary/Keyword: Motion Acquisition

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Development of Driving Simulator for Safety Training of Agricultural Tractor Operators

  • Kim, Yu-Yong;Kim, Byounggap;Shin, Seung-Yeoub;Kim, Jinoh;Yum, Sunghyun
    • Journal of Biosystems Engineering
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    • v.39 no.4
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    • pp.389-399
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    • 2014
  • Purpose: This study was aimed at developing a tractor-driving simulator for the safety training of agricultural tractor operators. Methods: The developed simulator consists of five principal components: mock operator control devices, a data acquisition and processing device, a motion platform, a visual system that displays a computer model of the tractor, a motion platform, and a virtual environment. The control devices of a real tractor cabin were successfully converted into mock operator control devices in which sensors were used for relevant measurements. A 3D computer model of the tractor was also implemented using 3ds Max, tractor dynamics, and the physics of Unity 3D. The visual system consisted of two graphic cards and four monitors for the simultaneous display of the four different sides of a 3D object to the operator. The motion platform was designed with two rotational degrees of freedom to reduce cost, and inverse kinematics was used to calculate the required motor positions and to rotate the platform. The generated virtual environment consisted of roads, traffic signals, buildings, rice paddies, and fields. Results: The effectiveness of the simulator was evaluated by a performance test survey administered to 128 agricultural machinery instructors, 116 of whom considered the simulator as having potential for improving safety training. Conclusions: From the study results, it is concluded that the developed simulator can be effectively used for the safety training of agricultural tractor operators.

Acoustic Scattering Characteristics of the Sea Bottom ( 1 ) (해저의 초음파 산란 특성에 관한 연구 ( I ))

  • Lee, Dae-Jae;Sin, Hyeong-Il;Park, Jung-Hui
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.26 no.1
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    • pp.51-56
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    • 1990
  • The authors carried out an experiment to investigate the echo fluctuations from ocean bottom due to ship's motion. The bottom echoes was continuously measured, by using a 50 kHz Echo sounder on board of the ship being at anchor under the sea condition of 15 knots in wind velocity and approximately 2 meters in wave height, to extract the information about the pulse stretching and the ship's motion from the first return and the second return. A data acquisition system was used to record digitally the envelope of the echoes, and the analysis was applied to the echo data collected from the continental shelf in the South China Sea. The results obtained can be summarized as follows: 1. The equivalent pulse width of the second return echoes from ocean bottom was 2.4 times longer than that of the first return echoes. 2. The echo peak values of the first return fluctuated markedly than that of the second return and was shown to be extremely sensitive to small change in ship's motion. 3. Energy target strength and peak target strength of the sandy-mud bottom were -13.4 dB and -14.6 dB, respectively.

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Recognizing the Direction of Action using Generalized 4D Features (일반화된 4차원 특징을 이용한 행동 방향 인식)

  • Kim, Sun-Jung;Kim, Soo-Wan;Choi, Jin-Young
    • Journal of the Korean Institute of Intelligent Systems
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    • v.24 no.5
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    • pp.518-528
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    • 2014
  • In this paper, we propose a method to recognize the action direction of human by developing 4D space-time (4D-ST, [x,y,z,t]) features. For this, we propose 4D space-time interest points (4D-STIPs, [x,y,z,t]) which are extracted using 3D space (3D-S, [x,y,z]) volumes reconstructed from images of a finite number of different views. Since the proposed features are constructed using volumetric information, the features for arbitrary 2D space (2D-S, [x,y]) viewpoint can be generated by projecting the 3D-S volumes and 4D-STIPs on corresponding image planes in training step. We can recognize the directions of actors in the test video since our training sets, which are projections of 3D-S volumes and 4D-STIPs to various image planes, contain the direction information. The process for recognizing action direction is divided into two steps, firstly we recognize the class of actions and then recognize the action direction using direction information. For the action and direction of action recognition, with the projected 3D-S volumes and 4D-STIPs we construct motion history images (MHIs) and non-motion history images (NMHIs) which encode the moving and non-moving parts of an action respectively. For the action recognition, features are trained by support vector data description (SVDD) according to the action class and recognized by support vector domain density description (SVDDD). For the action direction recognition after recognizing actions, each actions are trained using SVDD according to the direction class and then recognized by SVDDD. In experiments, we train the models using 3D-S volumes from INRIA Xmas Motion Acquisition Sequences (IXMAS) dataset and recognize action direction by constructing a new SNU dataset made for evaluating the action direction recognition.

The Study for the Method of Fast and Efficient Gamma-ray Detection for the Stereo Gamma-ray Ddetection System (스테레오 감마선 탐지장치의 고속 방사선 탐지기법에 관한 연구)

  • Hwang, Young-Gwan;Lee, Nam-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.9
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    • pp.1253-1258
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    • 2014
  • In this paper, we propose the fast and efficient detection method using the continuous measurement technique for the gamma-ray signal acquisition. This method is improved than the conventional method for the getting information of the radiation distribution. First, we implement the stereo radiation detection system using gamma-ray sensors and the motion controller. We apply continuous measurement technique to the gamma-ray detector and conduct gamma-ray irradiation test for the comparison of detection techniques. The results show that the continuous measurement technique has the high efficient performance than the conventional method.

Mapping of Real-Time 3D object movement

  • Tengis, Tserendondog;Batmunkh, Amar
    • International Journal of Internet, Broadcasting and Communication
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    • v.7 no.2
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    • pp.1-8
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    • 2015
  • Tracking of an object in 3D space performed in real-time is a significant task in different domains from autonomous robots to smart vehicles. In traditional methods, specific data acquisition equipments such as radars, lasers etc, are used. Contemporary computer technology development accelerates image processing, and it results in three-dimensional stereo vision to be used for localizing and object tracking in space. This paper describes a system for tracking three dimensional motion of an object using color information in real time. We create stereo images using pair of a simple web camera, raw data of an object positions are collected under realistic noisy conditions. The system has been tested using OpenCV and Matlab and the results of the experiments are presented here.

The study of Detection System Constuction For Urban Transit Circuit Breaker Motion Characteristic (도시철도 차단기 동작특성 검출장치 구성에 관한 고찰)

  • Im, Hyeong-Gil;Ryu, Ki-Seon;Lee, Gi-Seung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.95-95
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    • 2010
  • Because of the environmental matters the importance of the city railroad is as time goes by increasing. The case of obstacle of the power equipment which supplies electric power to city railroad will occur social and economical enormous loss. Thus, I studied on the preventing method in advance which makes it possible for us to maintain facilities efficiently. The main check points of the power facilities are voltage, current, humidity, partial discharge, move current. These points are gathered by sensor and transmitting to data acquisition device. These data are used to check equipment status in real time. In this paper I described in brief test process and results of the detection system.

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Development of Real Time Monitoring and Forecasting/Emergency System for Land Slide of Road

  • Kim, Choon-Sik;Yoon, Soo-Ho;Shin, Seung-Mok;Hur Chul;Kim, Sang-Bong
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.150.1-150
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    • 2001
  • This paper introduces a real time inspecting and monitoring system by using wireless communication and image processing technique. The communication system is developed by using 80c196kc microprocessor and it has data acquisition function for several kinds of sensors such as pluviometer, temperature, tension meter, elinometer and so on. The image processing method adopts Lalacian of Gaussian operator and least square method to extract line features for the captured images and uses a relaxation matching algorithm based in global structure constraint satisfaction to distinguish the matching error for those features. When the algorithm is processed, motion parameters of displacement area and its direction are computed. Once movement is recognized ...

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Flow Interaction of Sailing Drone using Numerical Method

  • Ngoc, Pham Minh;Choi, Min-Seon;Yang, Changjo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2019.11a
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    • pp.230-232
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    • 2019
  • There is an accelerating need for ocean sensing where autonomous vehicles can play a key role in assisting engineers, researcher and scientists with environmental monitoring and collecting oceanographic data. This paper is performed to develops an autonomous sailing drone to be used as a sensor carrying platform for autonomous data acquisition at Sea. From a sailing drone design viewpoint, it is important to establish reliable prediction methods for sailing drone's resistance. The required power for the propulsion unit depends on the ship resistance and speed. There are three solutions for the prediction of ship resistance as follow analytical methods, model tests in tanks and Computational Fluid Dynamics (CFD). The present paper aims at simulating sailing drone friction resistance using numerical method. The dynamic mesh motion is used to describe the sailing drone movement.

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The study of improving the accuracy in the 3D data acquisition of Motion Capture System (모션캡쳐 시스템에서 3차원 데이터 획득의 정확도 개선을 위한 연구)

  • Han, Chang-Ho;Kim, Soon-Chul;Seo, Pyoung-Won;Ryu, Young-Kee;Oh, Choon-Suk
    • Proceedings of the Korean Information Science Society Conference
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    • 2008.06c
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    • pp.503-506
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    • 2008
  • 기존 논문에서 CCD 카메라를 이용해 3차원 데이터를 획득하는 시스템을 소개했었다. 하지만, 정확도에서는 기존에 개발한 다른 PSD카메라를 이용한 시스템과 큰 차이를 보이지 않았다. 본 논문에서는 정확도를 개선하기 위한 여러 가지 실험을 했으며, 결과를 통해 상당히 향상되었음을 알 수 있다. 제안된 방법은 왜곡제거, z축 보정 등이며, 각 방법의 비교실험을 통해 얼마나 개선되었는지 살펴본다.

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Calibration of hydrophone Coordinates by the Telemetry techniques (초음파 핑거를 이용한 수파기 좌표의 보정)

  • 신현옥
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.28 no.3
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    • pp.252-261
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    • 1992
  • The accuracy of the position fixing with telemetry techniques depends in general on the accuracy of the location of the receiving point(hydrophone). To increase the accuracy of the coordinates of four hydrophones suspended down at both sides of the vessel anchored, each hydrophone motion is compensated using a depth pinger mounted on the seabed of 30m depth. The pinger location is calculated with a hyperbolic method. Using this technique so called hydrophone coordinates calibration, the movement of the Remotely Operated Vehicle(ROV), which has the same type of pinger mentioned above could be tracked down more accurately. Under the maximum variation ranges of a hydrophone of 5.2m in athwartships, 3.2m in alongship, and about 0.2m/s of the moving velocity in both directions, the ROV track with calibration is more close to the reality than that without calibration Tow depth pingers of same frequency can be distinguished by the use of three factors; The pulse period, the phase and the pulse period variation allowed in acquisition of the pinger as far as its pulse period is varied in smooth.

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