• Title/Summary/Keyword: low motion

Search Result 1,959, Processing Time 0.026 seconds

Adaptive Enhancement Method for Robot Sequence Motion Images

  • Yu Zhang;Guan Yang
    • Journal of Information Processing Systems
    • /
    • v.19 no.3
    • /
    • pp.370-376
    • /
    • 2023
  • Aiming at the problems of low image enhancement accuracy, long enhancement time and poor image quality in the traditional robot sequence motion image enhancement methods, an adaptive enhancement method for robot sequence motion image is proposed. The feature representation of the image was obtained by Karhunen-Loeve (K-L) transformation, and the nonlinear relationship between the robot joint angle and the image feature was established. The trajectory planning was carried out in the robot joint space to generate the robot sequence motion image, and an adaptive homomorphic filter was constructed to process the noise of the robot sequence motion image. According to the noise processing results, the brightness of robot sequence motion image was enhanced by using the multi-scale Retinex algorithm. The simulation results showed that the proposed method had higher accuracy and consumed shorter time for enhancement of robot sequence motion images. The simulation results showed that the image enhancement accuracy of the proposed method could reach 100%. The proposed method has important research significance and economic value in intelligent monitoring, automatic driving, and military fields.

ANALYSIS OF SLIDING MOTION OF PILED MULTI-BLOCK SYSTEMS CONSIDERING HORIZONTAL ROTATION (적층 강체블록의 수직축 회전을 고려한 Sliding운동 해석과 실험)

  • 황인섭;김재관
    • Proceedings of the Earthquake Engineering Society of Korea Conference
    • /
    • 2003.03a
    • /
    • pp.193-199
    • /
    • 2003
  • The most cultural heritages are composed of piled multi-block systems which are vulnerable to earthquakes. The stone of low height tends to slide when the excitation such as earthquake is applied and this sliding motion has effects on the whole response of the structure. In this study, analytical method of sliding motion of the piled multi-block systems considering horizontal rotation is developed and compared with shaking table test results. It is shown that the nonlinear analysis of sliding motion of multi-block system leads to satisfactory results.

  • PDF

A Study on the Multiresolution Motion Estimation Adequate to Low-Band-Shift Method in Wavelet Domain (웨이블릿 변환 영역에서 저대역 이동법에 적합한 다해상도 움직임 추정에 관한 연구)

  • 조재만;김현민;고형화
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.28 no.2C
    • /
    • pp.110-120
    • /
    • 2003
  • In this paper, we propose a Multiresolution Motion Estimation(MRME) adapted to Low-Band-Shift(LBS) method in wavelet domain. To overcome shift-variant property on wavelet coefficients, the LBS was previously proposed. This method which is applied to reference frame in video coding technique, has superior performance in terms of rate-distortion characteristic. However, this method needs more memory and computational complexity. In this paper, The computational complexity of the proposed method(LBS-MRME) is about 15.6% of that of existing method at 3-level wavelet transform. And although it has about 7 times as much as existing method's motion vector since each subband has different motion vector, it decreases motion compensated prediction error by detailed motion estimation, and then has better efficient coding performance. The experimental results with the proposed method showed about 0.3∼11.6% improvement of MAD performance in case of lossless coding, and 0.3∼3.0㏈ improvement of PSNR performance at the same bit rate in case of lossy coding.

Numerical and experimental investigation on the global performance of a novel design of a Low Motion FPSO

  • Peng, Cheng;Mansour, Alaa M.;Wu, Chunfa;Zuccolo, Ricardo;Ji, Chunqun;Greiner, Bill;Sung, Hong Gun
    • Ocean Systems Engineering
    • /
    • v.8 no.4
    • /
    • pp.427-439
    • /
    • 2018
  • Floating Production Storage and Offloading (FPSO) units have the advantages of their ability to provide storage and offloading capabilities which are not available in other types of floating production systems. In addition, FPSOs also provide a large deck area and substantial topsides payload capacity. They are in use in a variety of water depths and environments around the world. It is a good solution for offshore oil and gas development in fields where there is lack of an export pipeline system to shore. However due to their inherently high motions in waves, they are limited in the types of risers they can host. The Low Motion FPSO (LM-FPSO) is a novel design that is developed to maintain the advantages of the conventional FPSOs while offering significantly lower motion responses. The LM-FPSO design generally consists of a box-shape hull with large storage capacity, a free-hanging solid ballast tank (SBT) located certain distance below the hull keel, a few groups of tendons arranged to connect the SBT to the hull, a mooring system for station keeping, and a riser system. The addition of SBT to the floater results in a significant increase in heave, roll and pitch natural periods, mainly through the mass and added mass of the SBT, which significantly reduces motions in the wave frequency range. Model tests were performed at the Korea Research Institute of Ships & Ocean Engineering (KRISO) in the fall of 2016. An analytical model of the basin model (MOM) was created in Orcaflex and calibrated against the basin-model. Good agreement is achieved between global performance results from MOM's predictions and basin model measurements. The model test measurements have further verified the superior motion response of LM-FPSO. In this paper, numerical results are presented to demonstrate the comparison and correlation of the MOM results with model test measurements. The verification of the superior motion response through model test measurements is also presented in this paper.

Impact and Shock Attenuation of the Runners with and without Low Back Pain (요통 유무에 따른 달리기 시 충격과 충격 흡수율)

  • Lee, Young-Seong;Ryu, Sihyun;Gil, Ho Jong;Park, Sang-Kyoon
    • Korean Journal of Applied Biomechanics
    • /
    • v.31 no.1
    • /
    • pp.16-23
    • /
    • 2021
  • Objective: The purpose of the study was to compare the acceleration and shock attenuation (SA) of the runners with/without low back pain (LBG vs. NLBG) while running at 2.5 m/s, 3.0 m/s, 3.5 m/s and 4.0 m/s. Method: 15 adults without low back pain (age: 23.13±3.46 years, body weight: 70.13±8.94 kg, height: 176.79±3.68 cm, NLBG) and 7 adults with low back pain (age: 27.14±5.81 years, body weight: 73.10±10.74 kg, height: 176.41±3.13 cm, LBG) participated in this study. LBG was recruited through the VAS pain rating scale. All participants ran on an instrumented treadmill (Bertec, USA). Results: The LBG shows statistically greater vertical acceleration at the distal tibia during running at 3.5 m/s and 4.0 m/s and greater shock attenuation from the distal tibia to the head during running at 3.5 m/s compared with the NLBG during running (p<.05). As the speed increased, there was a statistically significant increase in vertical/resultant acceleration and shock attenuation for both groups. Conclusion: The findings indicated that the runners with low back pain (LBG) experience greater impact and shock attenuation compared with non-low back pain group (NLBG) during fast running. However, it is still inconclusive whether high impact on the lower extremity during running is the main cause of low back pain in the population. Thus, it is suggested that the study on low back pain should observe the characteristics of impact during running with individuals' low back pain experience and clinical symptoms.

A Review of Motion Capture Systems: Focusing on Clinical Applications and Kinematic Variables (모션 캡처 시스템에 대한 고찰: 임상적 활용 및 운동형상학적 변인 측정 중심으로)

  • Lim, Wootaek
    • Physical Therapy Korea
    • /
    • v.29 no.2
    • /
    • pp.87-93
    • /
    • 2022
  • To solve the pathological problems of the musculoskeletal system based on evidence, a sophisticated analysis of human motion is required. Traditional optical motion capture systems with high validity and reliability have been utilized in clinical practice for a long time. However, expensive equipment and professional technicians are required to construct optical motion capture systems, hence they are used at a limited capacity in clinical settings despite their advantages. The development of information technology has overcome the existing limit and paved the way for constructing a motion capture system that can be operated at a low cost. Recently, with the development of computer vision-based technology and optical markerless tracking technology, webcam-based 3D human motion analysis has become possible, in which the intuitive interface increases the user-friendliness to non-specialists. In addition, unlike conventional optical motion capture, with this approach, it is possible to analyze motions of multiple people at simultaneously. In a non-optical motion capture system, an inertial measurement unit is typically used, which is not significantly different from a conventional optical motion capture system in terms of its validity and reliability. With the development of markerless technology and advent of non-optical motion capture systems, it is a great advantage that human motion analysis is no longer limited to laboratories.

Motion Analysis of Head and Neck of Human Volunteers in Low-Speed Rear Impact (저속 후방 추돌 자원자 실험을 통한 두부와 경부의 동작분석)

  • Hong, Seong Woo;Park, Won-Pil;Park, Sung-Ji;You, Jae-Ho;Kong, Sejin;Kim, Hansung
    • Journal of Auto-vehicle Safety Association
    • /
    • v.4 no.2
    • /
    • pp.37-43
    • /
    • 2012
  • The purpose of this research is to obtain and analyze dynamic responses from human volunteers for the development of the human-like mechanical or mathematical model for Korean males in automotive rear collisions. This paper focused on the introduction to a low-speed rear impact sled test involving Korean male subjects, and the accumulation of the motion of head and neck. A total of 50 dynamic rear impact sled tests were performed with 50 human volunteers, who are 30-50 year-old males. Each subject can be involved in only one case to prevent any injury in which he was exposed to the impulse that was equivalent to a low-speed rear-end collision of cars at 5-8 km/h for change of velocity, so called, ${\Delta}V$. All subjects were examined by an orthopedist to qualify for the test through the medical check-up of their necks and low backs prior to the test. The impact device is the pendulum type, tuned to simulate the crash pulse of a real vehicle. All motions and impulses were captured and measured by motion capture systems and pressure sensors on the seat. Dynamic responses of head and T1 were analyzed in two cases(5 km/h, 8 km/h) to compare with the results in the previous studies. After the experiments, human subjects were examined to check up any change in the post medical analysis. As a result, there was no change in MRI and no injury reported. Six subjects experienced a minor stiffness on their back for no more than 2 days and got back to normal without any medical treatment.

Estimation of Sensitivity Axis Offset of an Accelerometer for Accurate Measurement of the 6 DOF Human Head Motion (인체 머리부 6 자유도 운동 측정의 신뢰성 향상을 위한 가속도계 감도축의 옵셋(offset) 추정)

  • Lee, Jeung-Hoon;Kim, Kwang-Joon;Jang, Han-Kee
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.18 no.9
    • /
    • pp.905-912
    • /
    • 2008
  • Notion sickness is well known to be caused by long time exposure to the very low frequency motion in the multiple axes of human body Since the vestibular system for the perception of low frequency motion is located in the head, accurate measurement of 6 degree of freedom head motion is of great importance. In this study, the measurement system consisting of a safety helmet and 9 translational accelerometers was constructed for the estimation of 3 translational and 3 rotational motions of human head. Since estimation errors of 3 rotational components can be significantly magnified even by small offset of the sensitivity axis from the geometric center of an accelerometer, accurate measurement of sensitivity axis must be preceded. The method for accurate estimation of the offset was proposed, and the effect of offset on the estimation of angular acceleration was investigated.

Effect of the Lumbar Range of Motion and Back Pain on Kinesiotaping of Erector Spinae Muscle (척주세움근의 키네시오 테이핑이 허리가동범위와 허리통증에 미치는 영향)

  • Park, Jonghang;Kim, Yoonhwan;Lee, Jaejun
    • Journal of The Korean Society of Integrative Medicine
    • /
    • v.3 no.4
    • /
    • pp.53-59
    • /
    • 2015
  • Purpose : To retestify about the changes of the range of motion and pain from kinesiotaping the erector spinae muscle. Method : Targeted the number of 30 people with low back pain and measured lumbar range of motion and pain before kinesiotaping on the erector spinae muscle. After that, the measured value were compared and analyzed. Result : First, before and after kinesiotaping, doing skin distraction test, the changes of the skin distance within each experiment group all statistically showed meaningful differences(p<0.05). Secondly, before and after kinesiotaping and testing pain threshold, it statistically showed meaningful differences(p<0.05). Conclusion : Both two groups showed that the change of the skin distance increased and the pain averagely decreased than before taping. Therefore, kinesiotaping is considered that it affected the low back, the range of motion and pain.

Significant Motion-Based Adaptive Sampling Module for Mobile Sensing Framework

  • Muthohar, Muhammad Fiqri;Nugraha, I Gde Dharma;Choi, Deokjai
    • Journal of Information Processing Systems
    • /
    • v.14 no.4
    • /
    • pp.948-960
    • /
    • 2018
  • Many mobile sensing frameworks have been developed to help researcher doing their mobile sensing research. However, energy consumption is still an issue in the mobile sensing research, and the existing frameworks do not provide enough solution for solving the issue. We have surveyed several mobile sensing frameworks and carefully chose one framework to improve. We have designed an adaptive sampling module for a mobile sensing framework to help solve the energy consumption issue. However, in this study, we limit our design to an adaptive sampling module for the location and motion sensors. In our adaptive sampling module, we utilize the significant motion sensor to help the adaptive sampling. We experimented with two sampling strategies that utilized the significant motion sensor to achieve low-power consumption during the continuous sampling. The first strategy is to utilize the sensor naively only while the second one is to add the duty cycle to the naive approach. We show that both strategies achieve low energy consumption, but the one that is combined with the duty cycle achieves better result.