• Title/Summary/Keyword: Active Push

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Design and Construction of a Push-Push Dielectric Resonator Oscillator at K-band (K-band용 Push-Push 유전체 공진 발진기의 설계 및 제작)

  • 이주열;이찬주;홍의석
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.29A no.2
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    • pp.8-17
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    • 1992
  • In this paper a push-push oscillator using DR (dielectric resonator) at K-band is designed and constructed. Two identical oscillators are arranged in a push-push configuration that has the frequency of oscillator that is twice frequency each oscillator. A dielectric resonator is placed at the input of an active two-port device(FET) yielding a stable frequency source. The oscillators realized with this technique exhibit excellent spectral purity and cancellation of fundamental frequency.

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A Characteristic Estimation of Current fed Push Pull Type High Frequency Resonant DC-DC Converter with Active Clamp Circuits (능동클램프회로를 갖는 전류공급 Push-Pull형 고주파공진 DC-DC 컨버터의 특성평가)

  • 오경섭;남승식;김동희
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.8
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    • pp.517-524
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    • 2004
  • In this paper, a novel zero-voltage-switching(ZVS) resonant DC-DC converter is proposed. It is composed of two symmetrical active-clamped circuits, the converter can be achieve ZVS in each switches. Also, active clamp capacitor ratios($\alpha$) of proposed circuit can be reduce a peak stress of switching voltage for each main switch. Simulation results using Pspice 9.2 ver and $C^{++}$ characteristic analysis show a provement for the validity of theoretical analysis. The analysis of the proposed Current-Fed Push Pull type DC-DC converter is generally described by using normalized parameter, and achieved an evaluated characteristic values which is needed to design a circuit. We confirm a rightfulness theoretical analysis by comparing a theoretical values and experimental values obtained from experiment using MOSFET as switching devices.

Design of PPL Service Platform for Smart Travelling based on Location (스마트 관광용 위치기반의 PPL 서비스 플랫폼 설계)

  • Kang, Min-Goo
    • Smart Media Journal
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    • v.5 no.4
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    • pp.138-142
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    • 2016
  • In this paper, a smart travel service platform is proposed with PPL(Product Placement) database based on the location of TV viewer who is 's marking by smart devices. This platform is designed with the active PUSH and smart kiosk signage with video clip of LTE/beacon's places. As a result, this PPL-DB platform is inter-worked for the PPL database of category, location, product, favor with interactive tagging in pictures and videos.

Immediate Effects of Flexi-bar Exercise With Knee Push-up Plus on Shoulder Joint Position Sense and Muscle Activity in Subjects With Scapular Winging

  • Kim, Seok-hyun;Cynn, Heon-seock;Baik, Seung-min
    • Physical Therapy Korea
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    • v.28 no.4
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    • pp.256-265
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    • 2021
  • Background: Individuals with scapular winging may have proprioceptive dysfunction which is important for motor control and causes shoulder instability. Reduced serratus anterior (SA) and lower trapezius (LT) muscle activity accompanied by over-active upper trapezius (UT), and pectoralis major (PM) may be contributing factors. Flexi-bar (FB) exercise may be used to increase joint position sense (JPS) and alter the target muscle activities. Objects: This study aimed to investigate the immediate effects of flexi-bar exercise prior to knee push-up plus (FPK) versus knee push-up plus (KPP) on JPS and muscle activity of SA, LT, UT, and PM in subjects with scapular winging. Methods: Eighteen subjects with scapular winging were recruited. JPS was investigated at baseline, after KPP and after FPK. Passive and active JPS errors were calculated by isokinetic equipment. Surface electromyography was used to record muscle activities during KPP and FPK. One-way repeated-measures analysis of variance and post hoc analyses were used to analyze the JPS error measured at baseline, after KPP and after FPK. Paired t-tests were used to compare muscle activities between KPP and FPK. Results: Passive JPS error was significantly decreased after KPP (p = 0.005) and after FPK (p = 0.003) compared to the baseline. Active JPS error was also significantly decreased after KPP (p = 0.016) and after FPK (p = 0.012) compared to the baseline. There was no significant difference in the passive and active JPS errors between KPP and FPK. SA activity during FPK was significantly increased (p = 0.024), and LT activity during FPK was significantly increased (p = 0.006). There were no significant differences in the UT and PM activity. Conclusion: FB might be recommended to immediately improve passive and active JPS and to selectively increase SA and LT muscle activities during KPP in individuals with scapular winging.

A Current-Fed Push-Pull Type High Frequency resonant DC-DC Converter with an Active-clamp-circuits (능동클램프회로를 갖는 전류공급 Push-Pull형 고주파공진 DC-DC 컨버터)

  • Oh, Kyeong-Seob;Won, Jae-Sun;Nam, Seung-Sik;Kim, Dong-Hee
    • Proceedings of the KIEE Conference
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    • 2003.10b
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    • pp.227-231
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    • 2003
  • In This paper, A novel zero-voltage-switching(ZVS) resonant DC-DC converter is proposed. it is composed of two symmetrical active-clamped circuits, The converter can achieve each switchs ZVS. proposed circuit is active clamp capacitor Ratios can be reduce switching voltage stress of each main switch. Simulation results using Pspice ver 9.2 show that the prove the validity of theoretical analysis.

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Development of an Active Controlled Ankle-Foot-Orthosis for Paralysis Patients (마비 환자를 위한 능동형 달하지 보조기의 개발)

  • Hwang, Sung-Jae;Kim, Jung-Yoon;Kim, Young-Ho
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.193-195
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    • 2006
  • In this study, we developed an active controlled ankle-foot orthosis(AAFO) which can control the dorsiflexion/plantarflexion of the ankle joint during gait to prevent foot drop and toe drag for paralysis patients. To prevent dropping foot after heel strike, ankle joint was actively controlled to minimize forefoot collision with the ground. It was also controlled to provide toe clearance and to help push-off during late stance. The 3D gait analysis was performed on two healthy subjects equipped with the developed AAFO to compare with the normal gait and the conventional AFO gait. In the developed AAFO gait, differently from the conventional AFO gait, significant push-off was observed during pre-swing and the maximum flexion moment during pre-swing phase was similar to that of normal gait. A remarkable dorsiflexion also occurred during initial swing. These results indicated that the developed AAFO could have certain clinical benefits to prevent foot drop for paralysis patients, compared to conventional AFOs.

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Active-clamp current-fed push-pull converter (능동 클램프를 이용한 전류원 푸쉬풀 컨버터)

  • Kim, Sang-Sik;Kwon, Bong-Hwan
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.1006-1007
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    • 2006
  • An active-clamp current-fed push-pull converter for the step-up application is proposed. The proposed converter is composed of active-clamp circuits and a voltage doubler rectifier. Thus, the voltage stress of the main switches is reduced and the output diodes are clamped to output voltage. Moreover, the output diodes can achieve zero current switching (ZCS) by the series resonance between resonant capacitors and leakage inductances. The prototype is designed for 350V/1.5kW with input voltage range $30{\sim}60V$. The theoretical analysis and experimental results are presented.

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The Study of Functional Movement in Healthy adults (기능적 움직임 검사의 방법과 적용에 관한 연구)

  • Lee, Jin;Yu, Tae-Ho;Seo, Woo Hyuk
    • Journal of Korean Physical Therapy Science
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    • v.24 no.1
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    • pp.49-58
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    • 2017
  • Purpose: To determine the effect of Functional movement screen(FMS) of Healthy subjects. Method: 18 subjects were randomly assigned toFunctional movement screen test. To measure functional movement screen(deep squat, hurdle step, in line lunge, shoulder mobility reaching, active straight leg raise, trunk stability push up, rotary stability). Result: FMS scores were deep squat 2.61score, right hurdle step 2.67 score, lift hurdle step 2.83 score, in line lunge 2.83 score, right shoulder mobility 2.67 score, left shoulder mobility 2.61 score, right active straight-leg raise 3.00 score, left active straight-leg raise 3.00 score, trunk stability push up 2.33 score, rotary stability 1.94 score. Conclusion: FMS can improve functional movement in healthy adults.

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Convergence Correlation Analysis of Physical Characteristics and Functional Movement Screen in Healthy Adults (정상 성인의 신체적 특성과 기능적 움직임 검사에 대한 융합적 상관관계 분석)

  • Kim, Hyun-Seung;Cho, Sung-Hyoun
    • Journal of the Korea Convergence Society
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    • v.11 no.4
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    • pp.87-93
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    • 2020
  • The purpose of this study was to examine the convergence correlation between physical characteristics and functional movement screen(FMS). Overall, 193 adults with normal single measurement values participated in the study. For data analysis, we used the SPSS Ver. 26.0 statistical program to perform t-tests and to determine Pearson's correlation coefficients for variables. Data analysis revealed significant sex differences in the active straight-leg raise and trunk stability push up tests (P<.05). In addition, our data analysis also revealed a negatively correlation between body fat percentage and FMS tests, except in the shoulder mobility and active straight leg raise test. In the active straight leg raise, the quality of functional movement was higher in women than in men; while in the trunk stability push ups, the quality of functional movement was higher in men than in women. Therefore, we conclude that men should reinforce the flexibility of the lower extremities, and females should apply upper body muscular strength for better trunk stability movement.

Smart Platform Design for Location based Drama Contents Services (위치기반의 드라마 콘텐츠서비스용 스마트 플랫폼 설계)

  • Choi, Youngho
    • Journal of Internet Computing and Services
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    • v.18 no.1
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    • pp.37-41
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    • 2017
  • In this paper, a platform was proposed that can service the streaming of location based real-time video-clip for smart-travel-services to work with PPL(Product Placement). The location information of drama like as LTE GPS and Beacon were used to provide the drama video with the PUSH service. And PPL DB with the attributes like as picture, video, music and URI(Uniform resource Identifier) was designed. As a result, this platform could provide the location based video streaming service that could replace the original PPL properties, color or shape, with the other properties by the interactive tagging the PPL DB in drama scenes. The proposed platform could provide the location based real-time video streaming service that can alter the PPL properties with the request of service provider.