• 제목/요약/키워드: cadence

검색결과 439건 처리시간 0.026초

Effects of Removable Ankle-Foot Orthosis in Chronic Patients With Hemiplegia During Gait Training: A Pilot Study

  • Kim, Hyung-geun;Oh, Yong-seop
    • 한국전문물리치료학회지
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    • 제22권3호
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    • pp.91-97
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    • 2015
  • This study was conducted to investigate the effects of the removable ankle-foot orthosis (RAFO) which was developed to improve the gait of stroke patients. The subjects of this study were five stroke patients who agreed to participate in this study by signing a written consent form. To verify gait improvement after wearing the orthosis, a Timed Up and Go test and Functional Gait Assessment were performed, and spatiotemporal gait variables such as gait speed, cadence, stride length, double limb support, and the efficient gait test of body sway angle were performed. For every variable, the differences prior to and after wearing the RAFO were compared using the Wilcoxon signed-rank test. Every gait variable improved significantly after wearing the RAFO compared to prior to wearing it. The pilot study will enhance future efforts to evaluate orthotic function objectively during gait in stroke patients.

Touch Screen Sensing Circuit with Rotating Auto-Zeroing Offset Cancellation

  • Won, Dong-Min;Kim, HyungWon
    • Journal of information and communication convergence engineering
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    • 제13권3호
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    • pp.189-196
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    • 2015
  • In this paper, we present a rotating auto-zeroing offset cancellation technique, which can improve the performance of touch screen sensing circuits. Our target touch screen detection method employs multiple continuous sine waves to achieve a high speed for large touch screens. While conventional auto-zeroing schemes cannot handle such continuous signals properly, the proposed scheme does not suffer from switching noise and provides effective offset cancellation for continuous signals. Experimental results show that the proposed technique improves the signal-to-noise ratio by 14 dB compared to a conventional offset cancellation scheme. For the realistic simulation results, we used Cadence SPECTRE with an accurate TSP model and noise source. We also applied an asymmetric device size (10% MOS size mismatch) to the OP Amp design in order to measure the effectiveness of offset cancellation. We implemented the proposed circuit as part of a touch screen controller system-on-chip by using a Magnachip/SK Hynix 0.18-µm complementary metal-oxide semiconductor (CMOS) process.

Photometric Variability of Symbiotic Stars at All Time Scales - Magellanic Cloud Systems

  • Angelnoi, Rodlfo
    • 천문학회보
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    • 제42권2호
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    • pp.38.1-38.1
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    • 2017
  • Symbiotic stars are long-orbital-period interacting binaries characterized by extended emission over the whole electromagnetic range and by complex photometric and spectroscopic variability. In this contribution, I will present some high-cadence, long-term optical light curves of confirmed and candidate symbiotic stars in the Magellanic Clouds. By careful visual inspection and combined time series analysis techniques, we investigate for the first time in a systematic way the photometric properties of these astrophysical objects, trying in particular to distinguish the evolutionary status of the cool component, to provide its first-order pulsation ephemeris and to link all this information with the physical parameters of the binary system as a whole. Finally, I will discuss a new, promising photometric technique, potentially able to discover Symbiotic Stars in the Local Group of Galaxies without the recourse to costly spectroscopic follow-up.

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A Photometric Investigation of KIC6118779 with Phase Smearing Effect

  • Jeong, Min-ji;Kim, Chun-Hwey
    • 천문학회보
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    • 제42권2호
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    • pp.63.3-64
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    • 2017
  • KIC6118779 is an over-contact binary system having a short orbital period of about 0.36 days. The photometric data for this system are acquired by the observations of Kepler mission in the long cadence mode having a time resolution of about 30 minutes. It means that the Kepler light curves of the system may be strongly affected by phase smearing effect and the analysis of them without consideration of the phase smearing effect may result in wrong stellar properties. Additionally, this system also shows dynamical variation of light curve resulting from spot activity. For all those reasons, it is difficult to investigate KIC6118779, and the investigation should be carried out carefully. In this presentation, we introduce the phase smearing effect and carry out the light curve modeling with the 2015 version of the Wilson-Devinney binary code considering the phase smearing effect. Our results show that the system is a deep over contact binary system and has extremely low mass ratio of about 0.12. Moreover our spot modeling implies the cyclic migration of a big cool spot on the massive component.

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Analysis of Solar Surface Data Obtained by Domless Solar Telescope of Hida observatory

  • 김현남;;;김갑성;최광선
    • 천문학회보
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    • 제35권1호
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    • pp.28.1-28.1
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    • 2010
  • Ground-based solar observations have several merits such as wider field of view and higher time cadence than those of satellite observations. The Domeless Solar Telescope of Hida Observatory is designed to acquire solar surface images at the highest possible spatial resolution using two types of spectrographs: a vertical spectrograph with the highest wavelength resolution in the world, and a horizontal spectrograph that can take images of the sun in multi-wavelength over the entire visible solar spectrum. The temporal variation of fine features such as chromospheric grains in the supergranulation cells and facular points in the network region has been obtained using DST Ca II K lines compared with Hinode Ca II H lines. This analysis is expected to provide a fundamental tool for research of diverse phenomena on the solar surface.

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대동작 기능 평가도구, 대동작 수행능력 측정도구, 그리고 시공간적 보행변수와의 상관관계 (Correlations Among GMFM, GMPM, and the Spatiotemporal Gait Parameters)

  • 박소연;고명숙;이충휘
    • 한국전문물리치료학회지
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    • 제11권2호
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    • pp.63-70
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    • 2004
  • These were two main purposes of this study. The first was to research the relevance between gross motor function measurement (GMFM) and the spatiotemporal parameters of gait in children with cerebral palsy. The second was to research the relevance between gross motor performance measure (GMPM) and the spatiotemporal gait parameters. Twelve children ($6.0{\pm}1.8$ years) with cerebral palsy participated in this study. GMFM and GMPM were performed and the spatiotemporal parameters of gait were measured by using WalkWay MG-1000. There were no significant correlations between the GMFM score and the stride length, step length, step width, cadence, and velocity (p>.05). The GMPM score also had no significant correlation with the spatiotemporal gait parameter (p>.05).

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Introduction to sample light curves of optical transients discovered by the KMTNet Supernova Program

  • Lee, Youngdae;Moon, Dae-Sik;Drout, Maria;Antoniadis, John;Ni, Chris;Lee, Jae-Joon;KIM, Sang Chul;Park, Hong Soo;Pak, Mina
    • 천문학회보
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    • 제42권1호
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    • pp.44.3-44.3
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    • 2017
  • We introduce sample light curves of optical transients discovered by the KMTNet Supernoa Program, focusing on their early discoveries and rapid evolutions decoded in the high-cadence observations of the program. For some sources, we also show their spectra obtained either from rapid Target-of-Opportunity follow-up observations immediately after their discoveries or from regularly-scheduled observations. We expect the program to bring unprecedented insights into what is happening during early phases of various types of optical transients, centered on supernovae.

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A Bit-level ACSU of High Speed Viterbi Decoder

  • Kim, Min-Woo;Cho, Jun-Dong
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제6권4호
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    • pp.240-245
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    • 2006
  • Viterbi decoder is composed of BMU(Branch metric Unit), ACSU(Add Compare Select Unit), and SMU(Survivor path Memory Unit). For high speed viterbi decoders, ACSU is the main bottleneck due to the compare-select and feedback operation. Thus, many studies have been advanced to solve the problem. For example, M-step look ahead technique and Minimized method are typical high speed algorithms. In this paper, we designed a bit-level ACSU(K=3, R=1/2, 4bit soft decision) based on those algorithms and switched the matrix product order in the backward direction of Minimized method so as to apply Code-Optimized-Array in order to reduce the area complexity. For experimentation, we synthesized our design by using SYNOPSYS Design compiler, with TSMC 0.18 um library, and verified the timing by using CADENCE verilog-XL.

모바일 시스템에 필요한 향상된 위상주파수검출기를 이용한 위상고정루프 (Fast locking PLL in moble system using improved PFD)

  • 감치욱;김성훈;황인호;이종화
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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    • pp.246-248
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    • 2007
  • This paper presents fast locking PLL(Phase Locked Loop) that can improve a jitter noise characteristics and acquisition process by designing a PFD(Phase Frequency Detector) circuit. The conventional PFD has not only a jitter noise caused from such a demerit of the wide dead zone and duty cycle, but also a long delay interval that makes a high speed operation unable. The advanced PFD circuit using the TSPC(True Single Phase Clocking) circuit is proposed, and it has excellent performances such as 1.75us of locking time and independent duty cycle characteristic. It is fabricated in a 0.018-${\mu}m$ CMOS process, and 1.8v supply voltage, and 25MHz of input oscillator frequency, and 800MHz of output frequency and is simulated by using ADE of Cadence.

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