• The Journal of Korean Physical Therapy
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• 제29권2호
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• pp.80-84
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• 2017

Purpose: This study was conducted to examine the effects of different sizes of blood flow restriction areas on the thickness of the external oblique and biceps brachii. Methods: The study subjects were 52 adults who were divided into four groups that performed plank exercises over a six-week period after blood flow restriction. Changes in the thickness of the external oblique and biceps brachii were measured using ultrasonography before the experiment, then three and six weeks after the experiment. The changes in each variable over time were evaluated by repeated-measures analysis of variance (ANOVA). Results: The external oblique and biceps brachii showed significant differences in muscle thickness with regard to time and the interaction between time and each group (p<0.01), but no significant differences with regards to changes between groups (p>0.05). Conclusion: A larger blood flow restriction area resulted in a statistically significant increase in muscle thickness. The results of this study may be used as the basis for future studies and for rehabilitation in clinical practice.

• 한국태양에너지학회 논문집
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• 제33권1호
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• pp.96-105
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• 2013

This study aims to investigate the energy performance of apartment in respect of complex design, building type and generation house layout and finally to produce the guide line for energy saving design. To grasp the present condition and problem about this subject, apartment building types were examined and representative types were extracted. Considering azimuth angle, private area, and generation number, building type of the subject apartment was classified in detail, energy simulation was conducted, and the effect to energy cost was compared. In the research, using VE energy simulation program, the heating and cooling load were calculated and converted to energy cost. It is expected that this analysed results will be basic data for the more integrated study. Research consequence can be summarized as follow: 1) Energy cost is compared according to several azimuth in plank '一' type apartment. As the results, calculated gas cost is the best in $49^{\circ}$, but total cost is in $-31^{\circ}$. 2) Apartment buildings of tower types are compared, it is resulted that 'Y' type (azimuth $-7^{\circ}$, $-20^{\circ}$) is the best in gas cost, but the total cost is worst because of high cooling load.

• 한국임상보건과학회지
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• 제7권2호
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• pp.1318-1324
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• 2019

Purpose. The study was conducted to find out the effects that women in their 20s with abdominal obesity can get from sling-based flanks. Methods. The study used In-Body to determine the weight and body fat rate of women in their 20s who were overweight at H University and used a tape measure to measure the circumference of the abdomen. Plank exercise using slings to reduce weight, body fat and abdominal circumference led to muscle stabilization and abdominal obesity reduction. The collected data were analyzed using the SPSS ver. 23.0 statistics program. Results. The results of the study showed statistically significant differences in the weight, body fat rate and abdominal circumference of the subjects before and after intervention. Conclusions. Steady abdominal muscles exercise help stabilize the abdomen, reduce abdominal body fat rate, and are effective in managing obesity.

• 대한안전경영과학회지
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• 제9권4호
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• pp.11-16
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• 2007

최근 들어 산업현장 뿐만 아니라 농어촌에도 자동화가 가속화되면서 작업자의 안정성과 편리성을 높이기 위한 다양한 방안이 제시되고 있지만 여전히 농업현장에서 대부분의 작업들이 부적절한 자세로 수행할 수밖에 없는 경우가 자주 발생한다. 본 연구는 쪼그려 앉는 작업자세가 요구되는 각종 농작업에 있어서 적합한 높이의 작업용 좌대를 제공함으로써 부적절한 작업자세를 개선하여 노동 강도를 경감시킴과 동시에 작업능률 향상과 요통 등 근골격계질환을 감소시켜 작업자의 건강과 안전을 증진시키는데 목적을 두었다. 이를 위하여 농작업에서 행해지는 쪼그려 앉는 여러 자세에 있어서 재배작물의 높이에 따라 적절한 작업용 좌대의 높이를 실험을 통하여 규명하였다. 연구결과 쪼그려 앉아 작업을 수행해야 하는 유사한 작업이라도 작업위치에 따라 쪼그려 앉는 작업용 좌대의 적합한 높이는 달라져야 한다는 것을 발견하였다. 즉 작업위치가 5cm 이하이면 작업용 좌대 높이는 10cm가 적절하며 작업위치가 20cm이면 15cm, 작업위치가 40cm이면 20cm가 적절함을 알 수 있었다. 이와 같은 결과를 농작업에 적용한다면 작업조건이 향상되어 편안하고 안전한 자세로 작업을 할 수 있기 때문에 허리, 어깨, 다리 등의 근골격계 질환을 감소시킬 수 있으며 인력작업에 따른 무리한 힘의 소모를 감소시켜 노동력 절감은 물론 생산성 향상을 가져올 수 있다고 판단된다.

• 천문학회보
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• 제37권2호
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• pp.110.1-110.1
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• 2012

We studied the source regions of 12 solar energetic particle (SEP) events seen between 2010 August and 2012 January at STEREO-A, B and ACE, when the two STEREO spacecraft were separated by about $180^{\circ}$. All events were associated with strong flares (C1 - X6) and fast coronal mass ejections (CMEs) accompanied by type II radio bursts. We have determined the arrival times of the SEP events at the three spacecraft. EUV waves observed in $195{\AA}$ and $193{\AA}$ channels of STEREO and SDO/AIA are tracked across the Sun and the arrival time of the EUV wave at the photospheric source of open field lines extending to the spacecraft connection points at 2.5 Rsun estimated. We found 7 events with flux enhancements in all spacecraft and 4 in two spacecraft. Most events came from a single source. The results show that magnetic field connections between source regions and the spacecraft play an important role in abrupt flux enhancements. In the most cases, EUV waves at the Sun are associated with a wide longitudinal spread of the SEPs.

• 한국재료학회지
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• 제32권7호
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• pp.313-319
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• 2022

Double-layer capacitors (DLCs) are developed with high surface electrodes to achieve a high capacitance value. In the present work, the initial bulk concentration of 1 mol/m³ and 3 mol /m³ are selected to show the consequential effects on the performance of a double-layer capacitor. A 1D model of COMSOL Multiphysics has been developed to analyze the electric field and potential in cell voltage, the electric displacement field and polarization induced by the field, and energy density in a double-layer structure. The electrostatics and the electric circuit modes in COMSOL are used to simulate the electrochemical processes in the double-layer structure. The analytical analysis of a double-layer capacitor with different initial bulk concentrations is investigated by using Poisson-Nernst-Plank equations. From the simulation results, the differential capacitance changes as a function of compact layer thickness and initial bulk concentration. The energy density varies with the differential capacitance and voltage window. The values of energy density are dominated by the interaction of ions in the solution and electrode surface.

• Physical Therapy Rehabilitation Science
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• 제12권1호
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• pp.56-61
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• 2023

Objective: Core training is a key exercise for conditioning and fitness programs, injury prevention, and more. This study aimed to find out the effect of adding dynamic core training, which is frequently prescribed in clinical practice, on dynamic balance and muscle activity compared to conventional static core training. Design: An experimental study Methods: This study is an experimental pilot study of prospective parallel design. Six healthy young adults were allocated to static core training group (SCG; crunch and plank) and blended group (BG; crunch, plank, and dead bug exercise) for two weeks to perform core training. Dynamic balance and muscle activity (erector spinae, rectus abdominis) were measured for all participants before and after core training. Results: All six healthy young adults enrolled completed the study. No significant difference was found before and after 6 sessions of core training in each group (P>0.05). Likewise, no significant difference was found in the results of the difference comparison between groups (P>0.05). Conclusions: In conclusion, in this experimental study, no difference was found when dynamic core training was added. Although the results before and after core training did not show improvement in dynamic balance and muscle activity, a randomized controlled trial is needed considering the results of previous studies and the limitations of this experimental study.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
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• pp.427-432
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• 1999

An electrci method for the rapid determination of chloride diffusion coefficient in concrete is proposed considering the electrical migration term in the Nernst-Plank equation. The experimental set-up for this method is basically that for PD index by Dhir, excluding some change in the experimental parameter values in consideration of reliability, simplicity and rapidity of the accelerated test method. Experimental results show that 30mm of specimen thickness, 10 volt of supplied potential, and 5M of chloride ion concentration are optimal

• 한국해양공학회지
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• 제16권4호
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• pp.37-41
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• 2002

선박해양 구조에 사용되는 대부분의 알루미늄 헬리데크는 외제로 관련 구조해석에 대한 정보도 일차적으로 외국의 전문업체가 제공하고 있고, 조선소에서는 필요시 주로 하부구조 해석을 보완하고 있다. 본 논문에서는 외국의 해석기술을 분석하고, 데크를 구성하고 있는 알루미늄 플랭크와 하부구조에 대한 구조해석을 수행하여 유사한 결과를 도출하였고, 해석에 관한 경험을 축적하였다.

• 대한수학회지
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• 제31권3호
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• pp.521-537
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• 1994

We consider the Schrodinger equation of quantum mechanics $$ i\hbar\frac{\partial t}{\partial}\Gamma(t, \vec{\eta}) = -\frac{2m}{\hbar}\Delta(t, \vec{\eta}) + V(\vec{\eta}\Gamma(t, \vec{\eta}) (1.1) $$ $$ \Gamma(0, \vec{\eta}) = \psi(\vec{\eta}), \vec{\eta} \in R^n $$ where $\Delta$ is the Laplacian on $R^n$, $\hbar$ is Plank's constant and V is a suitable potential.