• The Journal of Korean Physical Therapy
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• 제27권3호
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• pp.154-158
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• 2015

Purpose: The purpose of this study was to propose a new reference point for measurement of the infrasternal angle and to investigate the intra- and inter-rater reliabilities of infrasternal angle measurement using photographs. Methods: Twenty-four healthy male college students participated as subjects in this study. Photographs were taken of subjects in two postures, one standing with the shoulders relaxed and one standing with the shoulders at $150^{\circ}$ abduction. All photographs were analyzed using Image J software. Raters used the photographs to measure the infrasternal angle between the xiphoid process, the medial margin of rib and navel on the right and left sides. The reliability of the infrasternal angle measurement was assessed by means of intraclass correlation coefficients [ICC (3,1)]. The level of statistical significance was set at p<0.05. Results: The intra- and inter-rater reliabilities of the infrasternal angle measurement for the right side at rest were excellent (ICC=0.866 and 0.813, respectively), as were those for the left side at rest (ICC=0.919 and 0.846, respectively). At $150^{\circ}$ shoulder abduction, the intra- and inter-rater reliabilities for measurement of the infrasternal angle on the right side were excellent (ICC=0.972 and 0.778, respectively), as were those for the left side (ICC=0.914 and 0.826, respectively). Conclusion: These findings suggest that this technique can be successfully used to measure the infrasternal angle, thus suggesting a new reference point for determining the length of the internal oblique and external oblique muscles in clinical situations.

• 한국운동역학회지
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• 제27권2호
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• pp.141-147
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• 2017

Objective: We obtained force-displacement curves for countermovement jumps of multiple heights and examined the effect of an arm swing on changes in vertical jumping strategy. Countermovement jumps with hands on hips (Condition 1) and with an arm swing (Condition 2) were evaluated to investigate the mechanical effect of the arm movement on standing vertical jumps. We hypothesized that the ground reaction force (GRF) and/or center of mass (CoM) motion resulting from the countermovement action would significantly change depending on the use of an arm swing. Method: Eight healthy young subjects jumped straight up to five different levels ranging from approximately 10% (~25 cm) to 35% (~55 cm) of their body heights. Each subject performed five sets of jumps to five randomly ordered vertical elevations in each condition. For comparison of the two jumping strategies, the characteristics of the boundary point on the force-displacement curve, corresponding to the vertical GRF and the CoM displacement at the end of the countermovement action, were investigated to understand the role of arm movement. Results: Based on the comparison between the two conditions (with and without an arm swing), the subjects were grouped into type A and type B depending on the change observed in the boundary point across the five different jump heights. For both types (type A and type B) of vertical jumps, the initial vertical force at the start of push-off significantly changed when the subjects employed arm movement. Conclusion: The findings may imply that the jumping strategy does change with the inclusion of an arm swing, predominantly to modulate the vertical force advantage (i.e., the difference between the vertical force at the start of push-off and the body weight).

• 한국초전도ㆍ저온공학회논문지
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• 제4권1호
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• pp.135-139
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• 2002

In this study, the experimental open-tube and close-tube thermoacoustic apparatuses were built. In order to determine the optimum length of resonant tube and the optimum length of stack, the resonant characteristics of thermoacoustic apparatuses were investigated, The length of resonant tube varies from 400mm to 850mm. The experimental frequency varies from 100Hz to 1000Hz. In case of the second and third harmonics, the maximum temperature difference of open-tube thermoacoustic apparatus is 53$^{\circ}C$ (resonator length: 400mm) and the maximum temperature difference of closed-tube thermoacoustic apparatus is 51$^{\circ}C$ (resonator length: 500mm). In the open-tube thermoacoustic apparatus, the peak efficiency point is about 2%, 55%, 69% in the resonant tube and in the closed-tube thermoacoustic apparatus, the peak efficiency point is about 2%, 41%, 50% in the resonant tube.

• Journal of Yeungnam Medical Science
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• 제2권1호
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• pp.77-80
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• 1985

심전도에 의한 R-R 간격변동은 자율신경계의 기능을 검사하는데 매우 유용하고 또한 교감 신경계와 부교감신경계의 가능을 정량적으로 알아낼 수 있을 것으로 사료되었다. 특히, 당뇨병질환에 있어서 자율신경계의 dysfunction현상을 고찰하는데 매우 유용할 것으로 기대된다(Fig.5 참조). 그러나 임상에 직접 적용시켜온 바로는 기립시, 심호흡시에 발생되는 근전도에 의한 잡음이 간혹 발생되는 경우가 있는데 이것은 전극접착법과 무선송신기에 의해 제거될 것으로 기대되며 향후의 과제로 남아있다.

• 한국의류학회지
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• 제44권6호
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• pp.1107-1119
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• 2020

This study analyzed a subject's body reaction and subjective sensation when wearing a gait-assistive rehabilitation robot. The research method measured skin and clothing surface temperatures for 'seating-standing' and 'walking in place' exercises after wearing a gait-assistive rehabilitation robot. In addition, subjective sensation and satisfaction were evaluated on a 7-point Likert scale. The study results showed that the average skin temperature during exercise while wearing the gait-assistive rehabilitation robot was within a comfortable range. However, during the 'seating-standing' exercise, the skin temperature was slightly lowered. Additionally, the clothing surface temperature tended to be lower than the pre-exercise temperature after all exercises. The subjective sensation evaluation results showed that the wear comfort of the waist part was low during mobility/activity. In addition, an overall improvement in the wear comfort of the robot is necessary. The short-time movement of wearing and walking in the gait-assistive rehabilitation robot did not interfere with the thermal comfort of the body. However, the robot needs to be ergonomically improved in consideration of the long wearing time along with improved material that to satisfy overall wearing comfort.

• 한국의류학회지
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• 제10권2호
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• pp.21-28
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• 1986

This paper is concerned with the mutual relationship among interpressure, last. foot within a new shoe and foot within a fifty-hour-used shoe at the standing posture at three different heel-heights 1. The interrelationship between the heel-heights and interpressure is very significant at the level of $0.1\%$. The heel-heights cause high interpressure at different parts of foot; heel point and big toe point in a 3 cm-heel shoe, big toe point and heel outside joint point in a 5 cm-heel shoe, and little toe point, heel-outside joint point, and arch point in a 7 cm-heel shoe. 2. Foot girth and foot width measurements either within a new shoe or within a fifty-hour-used shoe significant at the level of $5\%,\;1\%,\;0.1\%$ and show discrepancies at three different heel heights; the part between instep and ball joint in a 3 cm-heel shoe, toe part in a 5 cm-heel shoe, heel-inside joint. heel-outside joint and toe part in a 7 cm-heel shoe are highly influenced by heel heights. The higher the shoe-hee15 are, the more heavily the fore part of foot is pressured in lateral direction because shoe is made to have high instep from a fashion viewpoint. Higher shoe heels prevent weight pressure from being concentrated on heel. If shoe heels are toe high, people in such shoes feel easily tired. It is very worthy of note in selecting shoes to consider not only the shoe fashion but also fore shoe type, heel height, and shoe material with proper elasticity.

• 한국컴퓨터정보학회논문지
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• 제25권5호
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• pp.81-90
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• 2020

직접 측정방법을 기반으로 3차원 스캔 데이터에서 유방의 자동측정을 위한 유방과 관련된 측정점 설정과 이상적인 3차원 스캔 자세를 제안하였다. 특히 직접 측정법에서의 유방 바깥쪽점은 체형과 자세에 따라 변동되기 쉬우므로 3차원 측정법에서는 유방에서 찾는 새로운 방법을 제안하였다. 유방의 윤곽선이 뚜렷하지 않은 유방 위쪽의 유방 위쪽점은 겨드랑접힘점을 기준으로 설정되는데 직접측정법에서의 유방 위쪽점이 3차원 스캔데이터에서 측정된 유방위쪽점보다 높게 설정됨을 알 수 있었다. 그러므로 직접 측정치와 3차원 측정치 간의 오차를 줄이기 위해서는 유방 위쪽점 설정에 관여되는 겨드랑앞접힘점 위치가 명확해야 할 것이다. 유방과 관련된 깊이 항목에서는 유방 바깥쪽점을 제외한 모든 깊이에서 직접 측정치가 높게 나타났는데 이는 피부 눌림에 의한 것으로 판단된다. 또 유방의 굴곡이 심한 유방아래길이와 유방아래 접힘선길이, 유방 안쪽점사이 간격은 굴곡에 의해 3차원 측정치가 직접 측정치보다 높게 나타나 유방에 대한 3차원 측정법이 일반화되기 위해서는 다양한 유방유형에 따른 측정치의 변화를 연구할 필요가 있다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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• pp.181-184
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• 2004

In this paper, we propose the dual band(2.4GHz and 5GHz) antenna for access point of WLAN(Wireless Local Area Network) which has similar radiation patterns for each band. Simulation results by using HFSS(High Frequency Structure Simulator) for the proposed antenna are presented. The electrical characteristics of the proposed antenna are measured with HP 8510C network analyzer and included. And radiation patterns are measured with rectangular anechoic far field antenna chamber. Measured results show that $S_{11}$ is less than - 14dB and VSWR(Voltage Standing Wave Ratio) is less than 1.5 for all frequency bands of interest. The measured maximum gain for elevation pattern at 2.40GHz is about 2.46dBi at $theta=-78^{\circ}$ and maximum gain for 5.825GHz is about 2.70dBi at $theta=-80^{\circ}.$ And the implemented antenna has good radiation pattern characteristic, therefore, we expect that the implemented dual band antenna is applicable for access point of WLAN.

• 대한조선학회논문집
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• 제47권6호
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• pp.782-786
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• 2010

Thrust deduction related to the prediction of power performance of a ship is rather resistance increase, and as a preliminary study for it forces upon a circular cylinder in a uniform flow of ideal fluid due to singularities located behind it are investigated. The circle theorem is used to get the complex velocity potential for the flow field under consideration, and the Blasius theorem is applied to obtain forces upon the circular cylinder. As singularities sinks, point vortices and dipoles and their combinations are treated. $\varepsilon$, standing for the strength of a singularity, and $\delta$, representing the distance between the cylinder and the singularity, are important small parameters for the resistance and lateral forces. For sinks or point vortices it is shown that the dimensionless forces upon the cylinder is O($\epsilon$) if $\epsilon$= O($\delta$) is assumed, and the same holds for dipoles if $\epsilon$= O(${\delta}^3$) is supposed. Forces upon the cylinder by a symmetric pair of sinks are greater than a single sink located at the central plane since there is an additional term due to cross effects, and the same is also valid for the case of dipole. Combination of dipole and a point vortex is also considered and a few new aspects are clarified.

• 한국산학기술학회논문지
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• 제13권8호
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• pp.3486-3491
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• 2012

본 연구는 2011년 11월 14일부터 11월 25일까지 강원도에 위치한 D대학교의 치위생과 3학년 재학생 중 120명을 대상으로 치과위생사 국가시험 합격의 변인에 대하여 조사 분석하였다. 수집된 자료는 SPSS WIN 13.0 프로그램과 R 2. 13. 2 프로그램을 이용하여, $x^2$(Chi-square) 검증, 회귀분석, Multiple linear Regression, Logistic Regression 등을 실시하였으며, 다음과 같은 결과를 얻었다. 1. 전공에 대한 만족도, 학업성적, 모의고사 성적이 높은 학생이 많이 합격하는 경향을 보였다. 2. 학업성적과 모의고사 성적은 양의 상관관계를 보였다. 3. 학업성적 평균과 전공에 대한 만족도가 같은 경우, 모의고사성적 평균이 1점 증가하면 국가시험에 합격할 확률은 불합격할 확률에 비해 1.141배 증가하였다. 본 연구결과, 치과위생사 국가시험 합격에 가장 많은 영향을 미치는 변인은 모의고사 성적으로 나타난 바, 국가시험 준비 시 모의고사 성적이 낮은 학생을 우선적으로 집중 지도 관리하여야 할 것으로 생각된다.