• Title/Summary/Keyword: Estimation Accuracy

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Robust Real-time Pose Estimation to Dynamic Environments for Modeling Mirror Neuron System (거울 신경 체계 모델링을 위한 동적 환경에 강인한 실시간 자세추정)

  • Jun-Ho Choi;Seung-Min Park
    • The Journal of the Korea institute of electronic communication sciences
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    • v.19 no.3
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    • pp.583-588
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    • 2024
  • With the emergence of Brain-Computer Interface (BCI) technology, analyzing mirror neurons has become more feasible. However, evaluating the accuracy of BCI systems that rely on human thoughts poses challenges due to their qualitative nature. To harness the potential of BCI, we propose a new approach to measure accuracy based on the characteristics of mirror neurons in the human brain that are influenced by speech speed, depending on the ultimate goal of movement. In Chapter 2 of this paper, we introduce mirror neurons and provide an explanation of human posture estimation for mirror neurons. In Chapter 3, we present a powerful pose estimation method suitable for real-time dynamic environments using the technique of human posture estimation. Furthermore, we propose a method to analyze the accuracy of BCI using this robotic environment.

GPS water vapor estimation modeling with high accuracy by consideration of seasonal characteristics on Korea (한국의 계절별 특성을 고려한 고정확도 GPS 수증기 추정 모델링)

  • Song, Dong-Seob
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.27 no.5
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    • pp.565-574
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    • 2009
  • The water vapor weighted vertically mean temperature(Tm) models, which were developed by the consideration of seasonal characteristics over the Korea, was used in the retrieval of precipitable water vapor (PWV) from GPS data which were observed at four GPS permanent stations. Since the weighted mean temperature relates to the water vapor pressure and temperature profile at a site, the accuracy of water vapor information which were estimated from GPS tropospheric wet delay is proportional to the accuracy of the weighted mean temperature. The adaption of Korean seasonal weighted mean temperature model, as an alternative to other formulae which are suggested from other nation, provides an improvement in the accuracy of the GPS PWV estimation. Therefore, it can be concluded that the seasonally appropriate weighted mean temperature model, which is used to convert actual zenith wet delay (ZWD) to the PWV, can be more reduced the relative biases of PWV estimated from GPS signal delays in the troposphere than other annual model, so that it would be useful for GPS PWV estimation with high accuracy.

A Selection Method of Reference Access Points to Improve the Localization Accuracy in Indoor Environments (실내 환경에서 측위 정확도 향상을 위한 기준 AP 선택 기법)

  • Lim, Yu-Jin;Park, Jae-Sung
    • Journal of KIISE:Information Networking
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    • v.37 no.6
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    • pp.489-493
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    • 2010
  • In an indoor localization method taking the lateration-based approach, the distance between a target and an AP (Anchor Point) is estimated using RSS (Received Signal Strength) measurements. Since the characteristics of a radio signal randomly vary in time and space, errors are unavoidable in distance estimation with measured RSS. Since the accuracy of distance estimation affects the localization accuracy of a lateration-based method, additional APs hearing a target have been used for localization in the literature. However, lots of experimental results show that the accuracy of a lateration-based method is improved by using carefully selected APs measuring the high quality RSSs which the distances estimated is close to the actual distances between nodes as reference APs, not using merely more APs. In this paper, we focus on selection method of reference AP and distance estimation method reflecting on environmental dynamics. We validate our method by implementing an indoor localization system and evaluating the accuracy of our method in the various experimental environments.

Half-pel Accuracy Motion Estimation Algorithm using Selective Interpolation in the Wavelet Domain (웨이블릿 영역에서의 선택적인 보간에 의한 반화소 단위 움직임 추정)

  • 이경환;정영훈;황희철
    • Journal of Korea Multimedia Society
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    • v.6 no.1
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    • pp.40-47
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    • 2003
  • In this paper, we propose a new method for reducing the computational overhead of fine-to-coarse multi-resolution motion estimation (MRME) at the finest resolution level by searching for the region to consider motion vectors of the coarsest resolution subband. At this time, if half-pel accuracy motion estimation (HPAME) is used in the baseband where influence a lot of effect to the reconstructed image, we can have the motion vector exactly But, this method causes to higher computational overhead. So we suggest the method to the computational overhead by using selective interpolation. Experimental results show that the proposed algorithm gives better results than the traditional algorithms from image quality.

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Preliminary study of time-of-flight measurement for 3D position sensing system based on acoustic signals

  • Kim, Heung-Gi;Park, Youngjin
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.79.4-79
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    • 2002
  • Our goal is the development of a system that estimates the location of interested point in a room with accuracy and low cost. Non-contacting position estimating method is widely used in various areas. Among these methods, acoustic signal-based method is the cheapest and provides reasonably accurate estimation as a result of many research efforts. Most of the acoustic-signal-based three-dimensional location estimators such as 3D sonic digitizer are using the ultrasound, and are organized with two procedures; time-of-flight (TOF) estimation and localization estimation. Since the errors in estimating the TOF could be accumulated with that of localization estimate, accuracy of TOF estimate is as...

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A Study on Urban Energy Consumption Estimation on the Urban Planning Stage (도시계획단계의 에너지 수요예측 방안에 관한 연구)

  • Yeo, In-Ae;Yoon, Seong-Hwan
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.506-510
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    • 2012
  • This study suggested an improved algorithm of urban energy consumption estimation on the urban planning stage which concerns calculation accuracy. The results are as follows. (1) Urban energy consumption was estimated and managed per unit space using E-GIS DB which contains facility information per mesh. (2) Urban energy consumption was reflected by the urban facility classified and standardized by the characteristics of energy use. (3) Calculation accuracy of energy consumption was approached by separately suggested as summer algorithm reflecting urban heat island on summer energy use and winter algorithm reflecting heating system normally used in Korea.

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Advanced Channel Estimation Method for IEEE 802.11p/WAVE System

  • Jang, DongSeon;Ko, Kyunbyoung
    • International Journal of Contents
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    • v.15 no.4
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    • pp.27-35
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    • 2019
  • In this paper, we propose an advanced Minimum Mean Square Error (MMSE) channel estimation method for IEEE 802.11p/Wireless Access in Vehicular Environments (WAVE) systems. To improve the performance of MMSE method, we apply the Weighted Sum using Update Matrix (WSUM) scheme to the step of calculating the instantaneously estimated channel and then, a time domain selectively averaging method is applied after the WSUM scheme. Based on that, the accuracy of instantaneously estimated channel increases and then, the accuracy of auto covariance matrix also increases. Consequently, we can achieve the performance gain over the conventional MMSE method. Through simulations based on the IEEE 802.11p standard, it is confirmed that the proposed scheme can outperform the existing channel estimation schemes.

Mathematical and Statistical Characterization of LD50 Estimation (LD50 산출방법에 있어서 수리 · 통계학적 특성)

  • Kim Se Ki;Kim Keun-Chong;Lee Byung Mu
    • Toxicological Research
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    • v.20 no.4
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    • pp.321-324
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    • 2004
  • Lethal dose 50% ($LD_{50}$) has been commonly used as a parameter for the estimation of acute toxicity not only in animal experiment, but also in human study. Several methods to estimate $LD_{50}$ had been introduced, but Spearman-Karber and Berens-Karber method have been widely used due to their relative convenience and accuracy. However, $LD_{50}$ values estimated from the two methods showed inconsistency and variation depending on the characteristics of mortality data. In this study, the two methods were comparatively investigated in terms of accuracy and stability for the estimation of $LD_{50}$.

A Research on the Dynamic Pressure Estimation for the Control Law Design of High Speed Vehicle (초고속 비행체 제어기법 설계를 위한 비행체 동압 추정 기법 연구)

  • Park, Jungwoo;Kim, IkSoo;Park, Iksoo
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.953-956
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    • 2017
  • This paper introduces general applications of vehicle's dynamic pressure information which is estimated during the flight. And a method to estimate the dynamic pressure for a high speed vehicle is suggested to sustain reliability of the flight under a high estimation accuracy of the information. The presented method is straightforward with simple relations of the compressible flow but is a still merited idea employed for the high speed vehicle control scheme with great accuracy.

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Error Analysis of Inter-Frequency Bias Estimation in Global Navigation Satellite System Signals (위성항법 신호 이중주파수간 편이 추정오차 분석)

  • Kim, Jeongrae;Noh, Jeong Ho;Lee, Hyung Keun
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.20 no.3
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    • pp.16-21
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    • 2012
  • Global navigation satellite systems (GNSS) use dual frequency signals to remove ionosphere delay effect. GNSS receivers have their own biases, called inter-frequency bias (IFB) between dual frequencies due to differential signal delays in receiving each frequency codes. The IFB degrades pseudo-range and ionosphere delay accuracies, and they must be accurately estimated. Simultaneous estimation of ionosphere map and IFB is applied in order to analyze the IFB estimation accuracy and variability. GPS network data in Korea is used to compute each receiver's IFB. Accuracy changes due to ionosphere model changes is analyzed and the effect of external GNSS satellite IFB on the receiver IFB is analyzed.