• Title/Summary/Keyword: Joint Data

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Analysis of Human Arm Movement During Vehicle Steering Maneuver

  • Tak, Tae-Oh;Kim, Kun-Young;Chun, Hyung-Ho
    • Journal of Mechanical Science and Technology
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    • v.19 no.spc1
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    • pp.444-451
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    • 2005
  • The analysis of human arm motion during steering maneuver is carried out for investigation of man-machine interface of driver and steering system Each arm is modeled as interconnection of upper arm, lower arm, and hand by rotational joints that can properly represents permissible joint motion, and both arms are connected to a steering wheel through spring and damper at the contact points. The joint motion law during steering motion is determined through the measurement of each arm movement, and subsequent inverse kinematic analysis. Combining the joint motion law and inverse dynamic analysis, joint stiffness of arm is estimated. Arm dynamic analysis model for steering maneuver is setup, and is validated through the comparison with experimentally measured data, which shows relatively good agreement. To demonstrate the usefulness of the arm model, it is applied to study the effect of steering column angle on the steering motion.

A Structural Flexible Behavior T-type Joint for RCS Composite System (철근콘크리트기둥과 철골보 접합부의 휨성능(1))

  • Kim, Young-Soo;Kim, Young-Ho;Jeong, Jae-Hun;Kim, Jin-Mu;Won, Young-SuI;Joo, Kyung-Jai
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.5 no.4
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    • pp.139-146
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    • 2001
  • Res system, with Reinforced Concrete columns and Steel beams, is defined as system in which both steel and concrete materials are efficiently combined to maximize the structural and economic advantages of each material. Tested in this study were 4 exterior beam-to-column joint specimens with variables that influence joint rigidity of RCS structure. The purpose of this study is to compare and analyze the structural behavior of exterior joints through the existing studies and tests, and offer basic data for practical use of RCS structure by studying flexible behavior(semi-rigid effect) of joints according to joint details.

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Characteristics of Joint High Temperature Superconducting tape (High Temperature Superconducting tape(Bi-2223)의 접속시 통전특성)

  • Kim, Hae-Joon;Sim, Ki-Deok;Cho, Jeon-Wook
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.244-245
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    • 2007
  • Specially, High Temperature Superconducting power-transmission cable(HTS cable), 3-phase 100m long, 22.9kV class HTS power transmission cable system have been developed by Korea Electrotechnology Research Institute (KERI) and LS cable Ltd. that is one of 21st century frontier project in Korea. This cable was installed in KEPCO(Go-chang) testing site. In case of manufacturing HTS cable, superconducting joint is very important because they need very long tapes. Therefore, this paper gives some investigation of AC Loss in joined HTS tape by using several joint methods. Finally, this paper was shown background data for the form of HTS cable joint.

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Efficient computational method for joint distributions of heights and periods of nonlinear ocean waves

  • Wang, Yingguang
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.11 no.1
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    • pp.597-605
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    • 2019
  • This paper proposes a novel method for efficient prediction of joint distributions of heights and periods of nonlinear ocean waves. The proposed novel method utilizes a transformed linear simulation which is based on a Hermite transformation model where the transformation is chosen to be a monotonic cubic polynomial, calibrated such that the first four moments of the transformed model match the moments of the true process. This proposed novel method is utilized to predict the joint distributions of wave heights and periods of a sea state with the surface elevation data measured at the Gulfaks C platform in the North Sea, and the novel method's accuracy and efficiency are favorably validated by using comparisons with the results from an empirical joint distribution model, from a linear simulation model and from a second-order nonlinear simulation model.

A Study on the Government's Investment Priorities for Building a Supercomputer Joint Utilization System

  • Hyungwook Shim;Jaegyoon Hahm
    • Asian Journal of Innovation and Policy
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    • v.12 no.2
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    • pp.200-215
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    • 2023
  • The purpose of this paper is to analyze the Korean government's investment priorities for the establishment of a supercomputer joint utilization system using AHP. The AHP model was designed as a two-layered structure consisting of two areas of specialized infrastructure, a one-stop joint utilization system service, and four evaluation items for detailed tasks. For the weight of each evaluation item, a cost efficiency index considering the annual budget was developed for the first time and applied to the weight calculation process. AHP analysis conducted a survey targeting supercomputer experts and derived priorities with 22 data that had completed reliability verification. As a result of the analysis, the government's investment priority was high in the order of dividing infrastructure for each Specialized Center and building resources in stages. In the future, the analysis results will be used to select economic promotion plans and prepare strategies for the establishment of the government's supercomputer joint utilization system.

A Dynamic Analysis of 150 ton Winch using Ocean Environment Data (해양 환경 데이터를 이용한 150톤 윈치의 동특성 해석)

  • Lee, Chang-Ho;Min, Cheon-Hong;Kim, Hyung-Woo;Jang, Jin-Woo;Hwang, Dong-Hwan;Rhyu, Yong-Suk
    • Ocean and Polar Research
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    • v.39 no.3
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    • pp.205-211
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    • 2017
  • This paper seeks to provide a dynamic analysis of a 150 ton winch based on ocean environmental data. The winch model that was subjected to analysis was modeled from CAD to each subsystem by the commercial software DAFUL. The winch model has tree brake systems (disk brake, band brake and ratchet brake). The rotation motion of the motor and contact elements of the brake are applied to the winch model in order to analyze its dynamic characteristics. In addition, a crane-barge was modeled to apply ocean environmental data. The motion data of the crane-barge was produced by means of the RAO(Response Amplitude Operator) of the barge and wave spectrum. The reaction force of the translational joint was measured instead of the tension of the cable. The brake performance of the winch was produced and assessed based on the operating motion of the crane-barge.

Relationship between Center of Pressure and Local Stability of the Lower Joints during Walking in the Elderly Women

  • Ryu, Ji-Seon
    • Korean Journal of Applied Biomechanics
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    • v.27 no.2
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    • pp.133-140
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    • 2017
  • Objective: The purpose of this study was to determine the relationship between center of pressure (CoP) and local stability of the lower joints, which was calculated based on approximate entropy (ApEn) during walking in elderly women. Method: Eighteen elderly women were recruited (age: $66.4{\pm}1.2yrs$; mass: $55.4{\pm}8.3kg$; height: $1.56{\pm}0.04m$) for this study. Before collecting data, reflective marker triads composed of 3 non-collinear spheres were attached to the lateral surface of the thigh and shank near the mid-segment to measure motion of the thigh and shank segments. To measure foot motion, reflective markers were placed on the shoe at the heel, head of the fifth metatarsal, and lateral malleolus, and were also placed on the right anterior-superior iliac spine, left anterior-superior iliac spine, and sacrum to observe pelvic motion. During treadmill walking, kinematic data were recorded using 6 infrared cameras (Oqus 300, Qualisys, Sweden) with a 100 Hz sampling frequency and kinetic data were collected from a treadmill (Instrumented Treadmill, Bertec, USA) for 20 strides. From kinematic data, 3D angles of the lower extremity's joint were calculated using Cardan technique and then ApEn were computed for their angles to evaluate local stability. Range of CoP was determined from the kinetic data. Pearson product-moment and Spearman rank correlation coefficient were applied to find relationship between CoP and ApEn. The level of significance was determined at p<.05. Results: There was a negative linear correlation between CoP and ApEn of hip joint adduction-abduction motion (p<.05), but ApEn of other joint motion did not affect the CoP. Conclusion: It was conjectured that ApEn, local stability index, for adduction/abduction of the hip joint during walking could be useful as a fall predictor.

Joint Estimation of the Outliers Effect and the Model Parameters in ARMA Process

  • Lee, Kwang-Ho;Shin, Hye-Jung
    • Journal of the Korean Data and Information Science Society
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    • v.6 no.2
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    • pp.41-50
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    • 1995
  • In this paper, an iterative procedure, which detects the location of the outliers and the joint estimates of the outliers effects and the model parameters in the autoregressive moving average model with two types of outliers, is proposed. The performance of the procedure is compared with the one in Chen and Liu(1993) through the Monte Carlo simulation. The proposed procedure is very robust in the sense that applies the procedures to the stationary time series model with any types of outliers.

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Track initiation for joint probabilistic data association filter (결합확률 데이타 연관 필터에서의 표적 초기화)

  • 김학용;박용환;황익호;서진헌
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.141-146
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    • 1992
  • Joint probabilistic data association filter(JPDAF) for multi-target tracking was developed for real-time implementation, while it abandoned an algorithm for track initiation. In this paper, we propose three features for track initiation that can be adapted to the JPDA filter. In addition, with the proposed approaches, the performance of track maintenance is evaluated in the case of tracks being near. To eliminate the abundant false tracks, we exploit the simple method using the state error covariances. Simulations are performed to demonstrate the efficiency of the proposed approaches.

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Optimal estimation of rock joint characteristics using simulated annealing technique - A case study

  • Hong, Chang-Woo;Jeon, Seok-Won
    • 한국지구물리탐사학회:학술대회논문집
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    • 2003.11a
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    • pp.78-82
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    • 2003
  • In this paper, simulated annealing technique was used to estimate the rock joint characteristics, RMR(rock mass rating) values, to overcome the defects of ordinary kriging. Ordinary kriging reduced the variance of data, so lost the characteristics of distribution. Simulated annealing technique could reflect the distribution feature and the spatial correlation of the original data. Through the comparisons between three times simulations, the uncertainty of the simulation could be quantified, and sufficient results were obtained.

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