• Title, Summary, Keyword: Lift-up

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Comparative Analysis of the Serratus Anterior Muscle Activity When Right and Left Knee Lift during Quadruped Position on Push Up Plus

  • Nam, KiSeok;Kim, JiWoong;Park, JiWon
    • The Journal of Korean Physical Therapy
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    • v.32 no.1
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    • pp.58-63
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    • 2020
  • Purpose: This study examined the effects of the right or left knee lift during push up plus in the quadruped position on the serratus anterior (SA) muscle activity. Methods: Twenty-one subjects (male 11, female 10) performed the quadruped position on push up plus. The muscle activities of the lower trapezius (LT), SA, and upper trapezius (UT) were measured by surface electromyography. Repeated measurements of one-way ANOVA were performed for statistical analysis of the data, and the criterion for statistical significance was set to p<0.05 and comparative analysis of the UT and SA ratio using a Paired t-test. Results: The right SA increased the muscle activity of the right knee lift during quadruped position push up plus (p<0.05). In particular, the right SA muscle activity was higher than the left. In addition, comparative analysis of the UT and SA ratio to the right knee lift during quadruped position push up plus was performed (p<0.05). The right was found to be a significant statistic compared to the left, but the left SA increased the muscle activity of the left knee lift during quadruped position push up plus (p<0.05). The left SA muscle activity was higher than right. In addition, comparative analysis of UT and SA ratio to the left knee lift during quadruped position push up plus was performed (p<0.05). The left was found to be a significance statistic than the right. In addition, the interaction effect between the groups showed significant differences (p<0.05). Conclusion: Knee lift during push up plus is recommended for the selective activation of a research exercise protocol of one side of the serratus anterior.

Cultural Characteristics and Scale-up for Submerged Cultivation of Hericium erinaceum Through Air-lift and Jar Fermenter System (Air-lift 및 Jar Fermenter에 의한 Hericium erinaceum 심부배양의 배양특성 및 Scale-up)

  • Jung, Jae-Hyun;Lee, Keun-Eok;Lee, Shin-Young
    • KSBB Journal
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    • v.21 no.2
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    • pp.103-109
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    • 2006
  • For the study of Hericium erinaceum as a useful functional foods and materials, liquid cultivation under two different bioreactors(air-lift fermenter and jar fermenter) which was not studied systematically until now, was conducted as a method of mass cultivation for H. erinaceum. A batch cultivation in an air-lift fermenter and a jar fermenter was examined for enhancing the productivity because of small amounts of mycelial weight and slow growth in case of a liquid culture for H. erinaceum. We found that air lift fermenter system was more effective than jar fermenter for mycelial production of H. erinaceum, and mycelial morphology was a critical factor of the growth. By scale-up and cultivation based on morphological analysis, the conditions for mass production with 30 L and 500 L jar fermenter was 200 and 150 rpm of agitation speed at 1 vvm of aeration rate, respectively, and mycelial dry weight under these conditions was enhanced to about $13{\sim}14g/L$.

A Study on Development Framework of Lift-up and Procurement System for Effective Resource Management in the Building Construction (건설공사의 자재관리 효율화를 위한 조달 및 양중시스템 기반구축에 관한 연구)

  • Lee Hyung-Soo;Yoon You-Sang;Suh Sang-Wook
    • Korean Journal of Construction Engineering and Management
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    • v.5 no.1
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    • pp.133-139
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    • 2004
  • The purpose of this study is to present an improved lift-up &procurement work flow for effective resource utilization in building construction. The current lift-up &procurement work flow has some waste factors; complicated information system, connection lack with process and decision-making delay. Therefore the study applied the value stream mapping methodology for improvement of current lift-up &procurement work flow. The main contents of the study are as follows; 1) Problems of current work flow were analyzed through current state mapping(CSM). 2) An improved work flow was suggested through future state mapping(FSM). 3) An improvement effect analysis of information system and lift-up planning was investigated. The study recommends continuous improvement of lift-up &procurement work flow and efficient management of information in building construction as a future research.

A Study of the High-rise building's Lift-up Management - through Division of Loading Factors of Equipment materials (초고층 건축 공사의 효과적인 양중 제안 - 설비공사 양중부하 분배 개선 방안)

  • Chung Yun-Woo;Kim Eun-Sang;Suh Hyun-Ah;Kim Chang-Duk
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • pp.539-542
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    • 2004
  • Nowadays, High-rise building becomes higher and bigger than ever. As a result, lots of construction materials are needed at the same times. Because of divided diverse process of construction, several different Processes concur simultaneously with complexity of procurement. So, effective construction material supply and lift-up are essential part of the spot. Especially, when ending part of construction, there are much conflict between finishing and equipment materials also problems of folding lift-up. The Purpose of this paper is suggesting better effective lift-up system through analysis of loading factors.

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A Study on the Improving Life-up and Procurement Work Flow for Effectiveness of Resources increase in the Building Construction (건설공사의 자원 효용성 증대를 위한 조달 및 양중 작업흐름 개선에 관한 연구)

  • Lee Hyung-Soo;Yoon You-Sang;Suh Sang-Wook
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • pp.442-445
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    • 2003
  • The purpose of this study is to present an improved lift-up & procurement work flow for effectiveness of resources increase in building construction. The current lift-up & procurement work flow has some waste factors; complicated information system, connection lack with process and decision-making delay. Therefore the study applied the value stream mapping methodology for improvement of current lift-up & procurement work flow. The main contents of the study are as follows; 1) A problem of current work flow were analyzed through current state mapping(CSM). 2) An improved work flow was suggested through future state mapping(FSM). 3) An improvement effect analysis of information system and lift-up planning The study recommends that continuous improvement of lift-up & procurement work flow and efficient management of information in building construction.

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A Study on the Lift-off Characteristics of an Air-lubricated Multi-leaf Foil Journal Bearing (공기윤활 다엽포일 저널 베어링의 회전축 부상 특성에 관한 연구)

  • 이용복;김태호;김창호;이남수;장건희
    • Tribology and Lubricants
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    • v.17 no.4
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    • pp.290-296
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    • 2001
  • Lift-off means that the rotating journal surface separates from the leaf surface in an air-lubricated multi-leaf foil journal bearing. Lift-off builds up minimum film thickness which will provide load capacity between leaves and journal. In this paper an analysis of air-lubricated multi-leaf foil journal bearing was performed with effects of multi-leaf foil deflection and compressible lubrication equation simultaneously. Minimum film thickness built up versus journal speed predicts the lift off characteristics and these results will be useful in designing and selecting the proper speed of the air-lubricated multi-leaf foil journal bearing.

Characteristics of fluctuating lift forces of a circular cylinder during generation of vortex excitation

  • Kim, Sangil;Sakamoto, Hiroshi
    • Wind and Structures
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    • v.9 no.2
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    • pp.109-124
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    • 2006
  • This paper describes the characteristics of the fluctuating lift forces when a circular cylinder vibrates in the cross-flow direction. The response characteristics on elastically supported the circular cylinder was first examined by a free-vibration test. Next, flow-induced vibrations obtained by the free-vibration test were reproduced by a forced-vibration test, and then the characteristics of the fluctuating lift forces, the work done by the fluctuating lift, the behavior of the rolling-up of the separated shear layers were investigated on the basis of the visualized flow patterns. The main findings were that (i) the fluctuating lift forces become considerably large than those of a stationary circular cylinder, (ii) negative pressure generates on the surface of the circular cylinder when the rolling-up of separated shear layer begins, (iii) the phase between the fluctuating lift force and the cylinder displacement changes abruptly as the reduced velocity $U_r$ increases, and (iv) whether the generating cross-flow vibration becomes divergent or convergent can be described based on the work done by the fluctuating lift force. Furthermore, it was found that the generation of cross-flow vibration can be perfectly suppressed when the small tripping rods are installed on the surface of the circular cylinder.

Super-Lift DC-DC Converters: Graphical Analysis and Modelling

  • Zhu, Miao;Luo, Fang Lin
    • Journal of Power Electronics
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    • v.9 no.6
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    • pp.854-865
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    • 2009
  • Super-lift dc-dc converters are a series of advanced step-up dc-dc topologies that provide high voltage transfer gains by super-lift techniques. This paper presents a developed graphical modelling method for super-lift converters and gives a thorough analysis with a consideration of the effects caused by parasitic parameters and diodes' forward voltage drop. The general guidelines for constructing and deriving graphical models are provided for system analysis. By applying it to examples, the proposed method shows the advantages of high convenience and feasibility. Both the circuit simulation and experimental results are given to support the theoretical analysis.

Fatigue Life Prediction of Medical Lift Column utilizing Finite Element Analysis (유한요소해석을 통한 의료용 리프트 칼럼의 피로수명 예측)

  • Cheon, Hee-Jun;Cho, Jin-Rae;Yang, Hee-Jun;Lee, Shi-Bok
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.24 no.3
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    • pp.337-342
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    • 2011
  • Medical lift column controlling the vertical position while supporting heavy eccentric load should have the high fatigue strength as well as the extremely low structural deflection and vibration in order to maintain the positioning accuracy. The lift column driven by a induction motor is generally in a three-step sliding boom structure and exhibits the time-varying stress distribution according to the up-and-down motion. This study is concerned with the numerical prediction of the fatigue strength of the lift column subject to the time-varying stress caused by the up-and-down motion. The stress variation during a motion cycle is obtained by finite element analysis and the fatigue life is predicted making use of Palmgren-miner's rule and S-N curves. In order to secure the numerical analysis reliability, a 3-D FEM, model in which the detailed lift column structure and the fitting parts are fully considered, is generated and the interfaces between lift column and pads are treated by the contact condition.

Development of the lift-up and procurement system for Just-in-Time in the Building Construction (건설공사의 적시생산(Just-In-Time)을 위한 양중시스템 개발)

  • Shin Bong-Soo;Kim Chang-Duk;Suh Sang-Wook;Lim Hyoung-Chul;Choi Woon-Ki
    • Korean Journal of Construction Engineering and Management
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    • v.4 no.4
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    • pp.182-191
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    • 2003
  • The material lift-up and procurement management for high-rise buildings is complex and critical key to the success of projects. It has been hardly managed by the heuristic or rule-of-thumb techniques which are adapted in usual construction building sites. Especially in downtown high-rise residential building project sites, the limit of heuristic management techniques is critical. It has space constraint for materials loading and site transportation especially in finish work phases in which construction period diverse work trades struggle for their own material and manpower transportation. Hence, it is essential to adapt JIT(Just-In-Time) concept in these particular types of building construction project sites. According to the analysis of the case project sites, the communication and flow of relevant information regarding material lift-up and transportation in project sites is the key factor for successful performance. Therefore, this study analyzes the flow and site transportation of the key materials and provides the system, PLUTO(Procurement & Lift-Up for material Transport Optimizing system). This study also applies the system in the case site and verifies the model validation in actual project.