• Title/Summary/Keyword: reject

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Design of Filter to Reject Motion Artifacts of PPG Signal by Using Two Photosensors

  • Lee, Ju-Won;Nam, Jae-Hyun
    • Journal of information and communication convergence engineering
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    • v.10 no.1
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    • pp.91-95
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    • 2012
  • The photoplethysmography (PPG) signal measured from a mobile healthcare device contains various motion artifacts occurring from a patient’s movements. Recently, to reject the motion artifacts, the method of using an acceleration sensor was suggested, but such sensors are very expensive. Therefore, this study deals with a novel sensor device to replace the acceleration sensor, and evaluated the performance of the proposed sensor experimentally. In the results of the experiments, it is shown that the proposed sensor device can reconstruct the PPG signal despite the occurrence of motion artifacts, and also that the variation rate in heart rate analysis was 1.22%. According to the experimental results, the proposed method can be applied to design a low-cost device.

Application of Membrane Processes to the Treatment of Wastewaters in Japan

  • Yamamoto, Kazuo
    • Proceedings of the Membrane Society of Korea Conference
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    • 1995.06a
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    • pp.39-50
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    • 1995
  • The membrane processes that are commonly uscd in water and wastewater treatment are reverse osmosis (Ro), ultrafiltration (UF) and microfiltration (MF), which utilize pressure differentials. There is also nano-filtration (NF), or low-pressure reverse osmosis, which is positioned midway between conventional reverse osmosis and ultrafiltration. Reverse osmosis membranes reject dissolved ions, while ultrafiltration can be used to reject relatively larger molecules, such as protein, polysacchalides and so on. Microfiltration is capable of eliminating particles at submicron level. This paper summarizes the characteristics of MSAS process first, as it is the main membrane process applied to wastewater treatment. Two successful examples of the applications, the cases of individual building reuse system and nightsoil treatment, are then shown. The latest trend of new membrane applications, i.e., immersed-type MSAS is also introduced.

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Recycling of Wastepaper(II) -Improvement of Drainage and Strength Properties of Testliner by Successive Treatments of Flotation and Mixed Enzyme- (고재재생연구(제2보)-부상부유 및 효소처리에 의한 라이너지의 탈수성 및 강도 개선)

  • 지경락;류정용;신종호;송봉근;오세균
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.31 no.1
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    • pp.10-16
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    • 1999
  • Air froth flotation was applied to OCC recycling process as a new pulp fractionation method and the effects of strength and drainage properties of testliner were also investigated. Fines including inks, stickies, and inorganic substances in OCC stock furnish were efficiently separated by the flotation. After the flotation, selective enzymatic treatment on the flotation reject was separately preformed, and then, the refined long fiber(flotation accept) portion was combined again with the fines(flotation reject) fraction for papermaking. This combination process was found to be effective in improving strength and drainage properties of testliner based on 100% OCC.

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Partial state feedback $H_{\infty}$ control of the two-mass resonant system having IM (2관성 공진계를 갖는 유도 전동기의 부분적인 상태 보상을 이용한 $H_{\infty}$ 제어)

  • 강석진;김진수;김영석
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.58-62
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    • 1998
  • In the industrial motor drive systems, a torsional vibration is often generated because of the elastic elements in torque transmission. One of general methods for the system is H$\infty$ controller to suppress the torsional vibration and reject the torque disturbance. vibration and reject the torque disturbance. Moreover, the two-degrees-of-freedom controller, which includes the H$\infty$ controller, is designed in order to improve the command following property. In this paper, we propose a new H$\infty$ controller with partial state feedback. This method having simple structure satisfies with the fast command following property and the attenuation of disturbances and vibrations simultaneously, just like the complicated TDOF H$\infty$ controller

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Engineering Properties of Cement Mortar using Mixed Aggregate with Thermal Plant Byproduct (화력발전부산물을 골재로 사전혼합한 혼합골재 사용 시멘트 모르타르의 공학적 특성)

  • Hyun, Seong-Yong;Kim, Mis-Sang;Lee, Jea-Hyeon;Park, Byeong-Moon;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.178-179
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    • 2017
  • In this study, the fundamental properties of cement mortar in relation to the change of the replacement ratio of the RA(Reject-Ash) were analyzed by mixing RA to the mixed aggregate consisting of poorly graded fine rock aggregate and marine aggregate for quality improvement. It was found that replacing 5% of the mixed aggregate with RA could improve the quality of the aggregate to the degree of fine rock aggregates.

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An Empirical Analysis on the Effectiveness of Students' Sociability Improvement using Sociometry (사회성 측정(sociometry)을 활용한 학생의 사회성 개선 효과 검증)

  • Kim, Dal-Hyo
    • Journal of Fisheries and Marine Sciences Education
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    • v.22 no.4
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    • pp.633-646
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    • 2010
  • The purpose of this study was to actually analyze students' sociability using sociometry and effectiveness of students' sociability improvement. To accomplish this purpose, subjects of this study were selected as follow. First, how students' sociability style are actually identified. And second, when teachers give additional concern, opportunity, care, praise to experiment group(reject, isolate, neglectee), what is the effectiveness of students' sociability improvement. As sampling, from fourth to sixth grades 270 students(215 control group, 55 experiment group) of 8 classrooms of 8 elementary schools were sampled. As a tool of investigation, questionnaires about students' sociability style and effectiveness of sociability improvement had made by researcher of this study were used. And as processing of data, ANCOVA were used. The result of this study is as follow. When teachers gave additional concern, opportunity, care, praise to experiment group(reject, isolate, neglectee), students' sociability were improved. In other words, student's self-concept, proactive behavior, human relationship were improved significantly.

The Segmentation Hypothesis of International Capital Markets; in the Regional Stock Markets Setting

  • Ryu, Sung-Hee;Lee, Sang-Keun
    • The Korean Journal of Financial Management
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    • v.15 no.2
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    • pp.401-419
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    • 1998
  • This paper examines the international arbitrage pricing model (IAPM) in regional equity markets setting. Factor analyses are used to estimate the international common risk factors. And the cross-sectional regression analyses are used to test the validity of regional IAPMs and Chow tests are used to evaluate the integration of regional equity markets. The results of factor analyses show that the number of common factors in each regional group is seven. The cross-sectional regression results lead us not to reject that the IAPMs are regionally valid but Chow test results lead us to reject that regional equity markets are integrated.

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Sectoral Price Divergence between Korea and Japan

  • Moon, Seongman
    • East Asian Economic Review
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    • v.20 no.4
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    • pp.493-517
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    • 2016
  • This paper examines the persistent properties of 12 sectoral relative prices between Korea and Japan obtained following the Classification of Individual Consumption according to Purpose (COICOP) over the period of 1985-2016. Applying a new econometric method developed by Pesaran which controls for the cross-section dependence in a panel, we are not able to reject the hypothesis that the sectoral real exchange rates contain a common stochastic trend. On the other hand, the well-known panel unit root tests such as the IPS and LLC tests widely used by previous studies strongly reject the unit root hypothesis. Since the error term of the regression for our panel exhibits significant cross-section dependence, these opposite results justify that the use of the new econometric method is appropriate.

Time Domain Analysis of Digital Filters for Noise Cancelling in ECG Signals (ECG신호의 잡음 제거를 위한 디지탈 필터의 시간 영역 해석)

  • Nam, Hyun-Do;Ahn, Dong-Jun;Lee, Cheol-Heui
    • Journal of Biomedical Engineering Research
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    • v.14 no.2
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    • pp.137-145
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    • 1993
  • Time domain analysis as well as frequency domain analysis of signal conditioning filters is very useful for practical applications. Time domain analysis of digital filters for noise cancelling in ECG signals is presented. Several band pass and band reject filters are designed for the analysis. Computer simulations are performed to compare the distortions of the Butterworth type filters and linear phase optimal FIR filters which are widely used for ECG signal processing. Band reject filters are applied to power line interference cancelling in ECG signals.

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Depth Control of Autonomous Underwater Vehicle Using Robust Tracking Control (강인추적 제어를 이용한 자율 무인 잠수정의 심도제어)

  • Chai, Chang-Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.4
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    • pp.66-72
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    • 2021
  • Since the behavior of an autonomous underwater vehicle (AUV) is influenced by disturbances and moments that are not accurately known, the depth control law of AUVs must have the ability to track the input signal and to reject disturbances simultaneously. Here, we proposed robust tracking control for controlling the depth of an AUV. An augmented closed-loop system is represented by an error dynamic equation, and we can easily show the asymptotic stability of the overall system by using a Lyapunov function. The robust tracking controller is consisted of the internal model of the command signal and a state feedback controller, and it has the ability to track the input signal and reject disturbances. The closed-loop control system is robust to parameter uncertainties. Simulation results showed the control performance of the robust tracking controller to be better than that of a P + PD controller.