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플랭크 운동 동안 엉덩관절 모음 · 벌림 저항이 몸통 근활성도에 미치는 영향
김지호,이민영,김명권 대한정형도수물리치료학회 2026 대한정형도수물리치료학회지 Vol.32 No.2
Purpose: This study examined the effects of the isometric hip resistance directions on the trunk muscle activity during plank exercises in healthy adult males. Methods: Thirty healthy men in their thirties with no history of low back pain or musculoskeletal disorders participated in this repeated-measures experimental study. Each participant performed the plank exercises under three conditions: neutral position, plank with isometric hip adduction, and plank with isometric hip abduction. Each condition was maintained for five seconds and repeated three times, with sufficient rest intervals between conditions to minimize muscle fatigue. The trunk muscle activity was measured using a wireless surface electromyography system. Electromyographic signals were collected from the erector spinae, rectus abdominis, external oblique abdominis, and internal oblique abdominis muscles and normalized to the percentage of the maximal voluntary isometric contraction (%MVIC). The collected data were analyzed using repeated-measures analysis of variance. Results: The erector spinae muscle activity was significantly lower during the plank exercise with isometric hip abduction compared to the neutral and hip adduction conditions (p<.05). In contrast, the activities of the rectus abdominis, external oblique abdominis, and internal oblique abdominis were significantly higher during plank exercise with isometric hip abduction than during the neutral position (p<.05). In addition, isometric hip adduction during the plank exercise increased the abdominal muscle activity significantly compared to the neutral condition (p<.05). Conclusion: These findings suggest that the direction of isometric hip resistance during the plank exercise significantly influences the trunk muscle activation patterns. In particular, plank exercise combined with isometric hip abduction may be an effective trunk-stabilization exercise by enhancing the selective activation of the abdominal muscles while reducing the excessive activation of the erector spinae. These results provide clinically useful evidence for designing trunk stabilization and rehabilitation exercise programs.
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김지호,양영순 한국전산구조공학회 1991 한국전산구조공학회논문집 Vol.4 No.4
구조응답이나 상태함수가 음함수(implicit function)형태로 주어지는 복잡한 구조물의 설계감도해석 및 신뢰성해석을 효율적으로 수행할 수 있는 방법을 개발하기 위하여, 먼저 확률 유한요소법을 사용한 확정론적 감도해석 방법을 정식화하고, 이를 바탕으로 MVFOSM, AFOSM 및 SORM등의 2차 모우먼트 방법에 의한 신뢰성 해석을 수행하였으며, 또한 신뢰성에 기초한 최적설계를 수행하는 경우에 필요한 확률론적 설계감도해석 방법을 제시하였다. 수치해석 예로서 박판 구조물의 평면응력문제와 판굽힘문제에 대한 해석을 수행하였는데, 초기 항복이 발생하는 경우를 파괴상태로 정의하였으며, 외부하중, 항복응력, 판두께, 탄성계수 및 Poisson비 등을 확률변수로 다루었다. 모든 경우에 있어서, 본 논문에서 제시한 방법으로 구한 구조응답의 분산이나 파괴확률이 Monte Carlo simulation의 결과와 잘 일치함을 알 수 있었으며, 또한 신뢰성설계시, 확률론적 감도해석결과로부터 확률변수들의 상대적 중요도를 파악할 수 있을 뿐만 아니라, 설계변수(혹은 확률변수)의 평균 혹은 분산계수의 변화에 따른 신뢰성지수의 변화량을 미리 예측할 수도 있다. For the purpose of efficiently calculating the design sensitivity and the reliability for the complicated structures in which the structural responses or limit state functions are given by implicit form, the probabilistic finite element method is introduced to formulate the deterministic design sensitivity analysis method and incorporated with the second moment reliability methods such as MVFOSM, AFOSM and SORM. Also, the probabilistic design sensitivity analysis method needed in the reliability-based design is proposed. As numerical examples, two thin plates are analyzed for the cases of plane stress and plate bending. The initial yielding is defined as failure criterion, and applied loads, yield stress, plate thickness, Young's modulus and Poisson's ratio are treated as random variables. It is found that the response variances and the failure probabilities calculated by the proposed PFEM-based reliability method show good agreement with those by Monte Carlo simulation. The probabilistic design sensitivity evaluates explicitly the contribution of each random variable to probability of failure. Further, the design change can be evaluated without any difficulty, and their effect on reliability can be estimated quickly with high accuracy.
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RFID 기술을 적용한 물류 네트워크에서의 물류정보 통합검색 모델
김지호,신기원,박대원,권혁철 한국경영과학회 2009 한국경영과학회 학술대회논문집 Vol.2009 No.5
물류 네트워크에서는 참여 업체 간의 정보 교환과 공유가 지속적으로 이루어진다. 이때 물류정보 유통체계는 분산된 물류정보에 효과적으로 접근하고 활용할 수 있도록 지원해야한다. 이를 위해서는 물류정보를 통합 관리, 검색이 필요하다. 본 논문에서는 물류 네트워크에서의 물류 프로세스와 물류정보 유통 프로세스를 정의하고, 이를 기반으로 한 물류정보 통합검색 모델을 제시한다. 특히, RFID 기술을 적용한 물류 네트워크에서의 물류정보 통합검색 모델을 설계한다. 이를 위해 RFID 기술을 적용한 물류 네트워크에서 물류정보를 검색하고, 접근하기 위한 물류정보 유통 프로세스를 정의한다.
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미국 자동차보험에 있어서 무과실보험의 중재에 관한 고찰 - 미국 뉴욕주를 중심으로 -
김지호 한국중재학회 2012 중재연구 Vol.22 No.1
No-fault automobile insurance system is a statutory scheme to provide automobile accident victims with compensation for certain expenses arising from personal injuries occurring in car accidents. New York State has enacted No-Fault Law to ensure that the injured in automobile accidents be paid rapidly by their own insurance company for medical expenses, lost earnings regardless of fault, replacing common law system of reparation for personal injuries under tort law. Its primary purpose is to facilitate compensation without the need to exhaust time-consuming litigation over establishing the existence of fault and the extent of damages. No-Fault Law allows arbitration as a method for settling the no-fault insurance disputes. No-fault arbitration, however, differs in a significant way from general arbitration system. First, No-Fault Law provides the parties with the option to submit any dispute involving no-fault automobile insurance to arbitration. Second, no-fault arbitration attempts to speed its procedure incorporating various methods. Third, the parties are required to seek review of arbitral awards by master arbitrator prior to seeking court's review. Fourth, the parties have right to bring de novo action in court if master arbitrator's award exceeds $5,000. Given the current state of law in Korea, it may not be easy to introduce no-fault arbitration system into Korea in the context of automobile insurance disputes settlement as its law has a long-established reparation system based on tort liability and no-fault arbitration system has its own features that differ from general arbitration system. Nonetheless, it could be suggested that no-fault arbitration be introduced in other fields which require speedy dispute resolution and a third party's decision to settle the disputes. The optional right of submitting disputes to arbitration as provided by No-Fault Law of New York State may offer a ground to supprot the effectiveness of an optional arbitration agreement.
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김지호,정현식,권오엽,신종호,Kim, Ji-Ho,Jeong, Hyeon-Sic,Kwon, Oh-Yeob,Shin, Jong-Ho 한국터널지하공간학회 2014 한국터널지하공간학회논문집 Vol.16 No.1
In order to identify a load transfer mechanism of ground anchors, the behavior of multi load transfer ground anchor systems was investigated and compared with those of compression type anchors and tension type anchors. Large scale model tests were performed and stress-strain relationships were obtained. The load transfer mechanism of ground anchors was also investigated in the field tests. Finally, numerical analyses to predict the load-displacement relationships of anchors were conducted. It is concluded that the load transfer characteristics of MLT anchors are mechanically much more superior in the pull-out resistance effect than those of existing compression and tension type anchors. From the results of research work, we could suggest that the max pull-out capacity of anchor capacity to each the soil condition. Also, the MLT anchors can be used to achieve both structural enhancement and economic construction in earth retaining or supporting structures.
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