• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.278-278
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• 2011

LCD 생산에 적용할 수 있는 대형 마그네트론 스퍼터 장비에서 공간적으로 불균일한 타겟 침식은 타겟의 사용 효율을 떨어뜨린다. 특히 직사각형의 외부 자석과 직선형태의 내부 자석 구조를 가진 마그네트론 스퍼터에서는 cross-corner 효과로 인해 국부적으로 일정 부분에 대한 상대적으로 높은 침식률이 문제가 된다. 이러한 문제를 해결하기 위해 국부적으로 자기장 세기를 바꾸는 시행착오를 통하여 실험적으로 문제를 해결하려는 방법이 있지만 비용 및 시간이 매우 많이 들어 전산모사를 통한 문제 해결 방법이 훨씬 유리하다. 우리는 몬테 카를로 방법에 기반한 3차원 입자 시뮬레이션을 통하여 마그네트론 스퍼터 장비를 모델링을 하였다. 직사각형의 외부와 직선형의 내부 자석 구조가 만들어 내는 정적인 공간 자기장의 분포는 OPERA3D를 이용하여 계산하였고, 플라즈마 입자들이 만들어내는 자기장에 의해 섭동영향을 받지 않는다고 가정하였다. 플라즈마 전기장 및 전하의 운동은 상호작용의 일관성이 유지되도록 계산하였다. 이온밀도의 공간분포는 내부 자석과 외부 자석 사이의 직선 부분 보다 cross-corner 효과가 일어나는 부분에서 상대적으로 더 높은 밀도분포를 보였다. 플라즈마 시뮬레이션을 통하여 얻은 타겟에 입사한 이온의 개수 및 속도에 대한 정보를 이용하여 타겟의 침식률을 계산하였다. 이러한 침식률을 계산하기 위한 시뮬레이션 기술은 산업용 대형 스퍼터 장비 연구 및 개발에 매우 효율적인 방법이 될 것이다.

• Journal of the Korean Society for Precision Engineering
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• v.31 no.5
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• pp.423-430
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• 2014

In this study, the five-DOF motion at ultra-precision linear stage under static and dynamic conditions are evaluated through the extending application of ISO 230-2. As the performance factors, the bi-directional accuracy and repeatability of the five-DOF motion are quantitatively evaluated with the measurement uncertainties which are determined using the standard uncertainty of equipment used in experiment. The motion under static condition are analyzed using geometric errors. The five geometric errors except the linear displacement error are measured using optimal measurement system which is designed to enhance the standard uncertainty of geometric errors. In addition, the motion under dynamic conditions are analyzed with respect to the conditions with different feed rate of the stage. The experimental results shows that the feed rate of stage has a significant effect on straightness motions.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.23 no.2
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• pp.1-8
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• 2017

Background: The purpose of this study was to investigate the effects on static balance and disability in chronic low back pain with lumbar rotation extension subgroup of trascranial direct current stimulation (tDCS) and lumbar motor control exercise (MCE). Methods: In 40 male low back pain with lumbar rotation extension subgroup subjects were recruited for the study. Subjects were randomly allocated into two groups. Experimental groups received tDCS and MCE, Control groups received sham-tDCS and MEC. Before and after intervention, measured in surface area, whole path length and Roland-Morris low back pain questionnaire (RMQ). Results: Showed a significant static balance and disability from the experimental groups compared to the control group. Showed a no significant RMQ score from experimental groups compared to the control group. Conclusions: tDCS and lumbar MCE showed the increased static balance in chronic low back pain with lumbar rotation extension subgroup.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.93-96
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• 2008

This paper deals with the shaking table test(STT), the Quasi-Static Test(QST), and the Pseudo-Dynamic Test(PDT) to evaluate the seismic performance of RC bridge piers under near fault ground motion. Five scaled specimens were constructed the weight of the superstructure was applied through the prestressing strand at the centroid of the column section during the QST and PDT. However, the STT was simulated. The lateral inertia force of the superstructure by the mass frame which was linked with the pier because of the limited payload of shaking table. Particularly for the STT, friction underneath the mass frame was minimized by special details and it was verified by a series of pre-load test. Scale factor of the RC piers was 4.25.

• Journal of Families and Better Life
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• v.13 no.3
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• pp.88-101
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• 1995

본 연구는 쓰레기 처리문제와 관련하여 분리수거, 감량화, 재활용 등에 적극적으로 참여해야 할 주부소비자를 중심으로 환경보전의식과 환경보전행동을 살펴보고 관련된 변인들을 분석해 봄으로써 환경보전에 대한 소비자의 책임감과 올바른 환경관을 고취시키고 나아가 환경교육프로그램의 개발과 환경정책에 필요한 기초자료를 제공하기 위하여 수행되었다. 본 연구의 결과를 요약하면 다음과 같다. 1) 주부의 환경보전의식 수준은 평균 4.25(5점만점)로 높게 나타났으며, 연령과 주거형태에 따라서만 유의한 차이를 보였다. 환경보전행동 수준은 평균 3.56으로 비교적 높게 나타났으며, 연령, 학력, 월평균 가계소득이 높을수록 분리수거함이 존재할 경우, 반상회에 참여함에 따라 높게 나타났으며 변화추구에 소극적이고 적극활동형, 전통주의형, 합리주의형, 현실안정형의 성향이 높은 주부일수록 환경보전의식 및 행동이 높게 나타났다. 또한 주부의 쓰레기 처리에 대한 관심도는 평균 3.97로 비교적 높게 나타났으며 연령, 학부, 분리수거함의 존재, 주거형태가 아파트와 단독주택인 경우에 관심도가 높은 것으로 나타났다. 2) 주부의 환경보전의식 및 행동과 쓰레기 처리에 대한 관심도간에는 정적상관관계가 있는 것으로 나타났다. 3) 주부의 쓰레기 처리에 대한 관심도에 영향을 미치는 변인으로는 환경보전운동에의 참여행도, 환경교육, 적극활동형, 변화추구형, 재활용행동으로 나타났다.

• 한국벤처창업학회:학술대회논문집
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• 2018.11a
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• pp.31-34
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• 2018

다중지능은 하워드 가드너가 제시한 개념으로, 지능이 단일한 지적 능력을 나타내는 구조(construct)이라기 보다는 다차원적인 복수의 하위 능력들로 구성된 것이라는 의미를 담고 있다. Gardner는 다중지능의 구성을 음악지능이나 신체운동지능, 논리수학지능, 언어지능, 공간지능, 인간친화지능, 자기성찰지능 그리고 자연친화지능 등과 같은 상호독립적 능력으로 분류하고 있으며, 각 개인은 각 능력 영역에서 다른 발달 수준을 가지고 있다고 본다. 본 연구는 창업자의 다중지능의 영역별 발달 특성이 창업 실행 행동, 창업 분야, 창업 성과 만족도에 영향을 미치는지를 알아보는 것을 통해 예비 창업자들이 본인의 적성과 재능에 적합한 분야에서의 창업 가능성을 탐색하도록 돕는 지도자들에게 시사점을 제공하고, 향후 창업가 육성 프로그램의 구성 개선안을 마련하는 데에 기여하고자 한다. 이를 위해 본 연구에서는 2018년 중소기업진흥공단 청년창업사관학교에 입교한 만 39세 이하의 청년창업자 200인을 대상으로 다중지능검사와 인구통계학적 특성 및 창업 특성에 대해 묻는 설문조사를 실시한 후, Pearson 상관계수 및 다변량분산분석을 통해 수집된 자료를 분석할 예정이다. 연구목적을 달성하기 위하여 설정한 가설은 다음의 3가지이다. 가설 1. 창업자의 다중지능 영역별 발달 수준과 창업 실행에는 정적인 상관이 있을 것이다. 가설 2. 창업자의 다중지능 영역별 발달 수준에 따라 창업자가 선택한 창업 분야에 유의한 차이가 있을 것이다. 가설 3. 창업자의 다중지능 영역별 발달 수준에 따라 창업자의 창업 성과 만족도에 유의미한 차이가 있을 것이다.

• Journal of the Korean Society of Physical Medicine
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• v.16 no.1
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• pp.73-81
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• 2021

PURPOSE: This study examined effects of the untact trunk stabilization exercise program on muscle thickness, trunk strength, maximal expiratory flow, and static balance. METHODS: The subjects were 20 normal adults divided into 10 in the contact exercise group and 10 in the untact exercise group. The trunk stabilization exercise program was conducted for four weeks. The muscle thickness was measured using ultrasound. The maximal expiratory flow was measured using Personal Best Full Range Peak Flow Meter. The static balance was measured through Bio-rescue; and the trunk muscle strength was measured by bending the upper body forward and measuring the time for maintaining the posture. RESULTS: Both contact and untact exercise groups showed significant differences in muscle thickness, muscle strength, maximal expiratory flow, and static balance (p < .05). A significant difference in muscle thickness on ultrasound was observed between the contact and untact exercise groups (p < .05). CONCLUSION: Activation of the transverse abdominal muscle requires accurate instructions of the contact exercise, but despite environmental constraints, the untact exercise program is as effective as the contact exercise for improving muscle strength, maximum expiratory flow, and static balance.

• PNF and Movement
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• v.9 no.4
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• pp.13-21
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• 2011

Purpose : The purpose of this study was to analyze the effect of closed kinematic chain exercise and proprioceptive neuromuscular facilitation exercise on the static dynamic balance performance of hemiplegic patients in order to suggest them therapeutic intervention methods. Methods : The subjects of this study were 18 hemiplegic patients grouped into 2 subgroups according to the exercise program. one group of closed kinematic chain exercise carried out sit to stand, Hooklying with pelvic lift(bridging) and stair-up & down by a hemiplegic leg. The other group of proprioceptive neuromuscular facilitation exercise carried out leg flexion-extension pattern in supine position, leg flexion pattern in standing and stabilizing reversal exercise in stating position. Each exercise was carried out over 3 sets of 10reps. Results : The results of this study were summarized as follows: 1. For both groups, there were statistically significant changes in the static balance (FICSIT-4) performance after exercise program (p<.05). 2. For both groups, there were statistically significant changes in the dynamic balance (FSST, TUG, FRT) performance after exercise program (p<.05). 3. In the comparison between both groups, there was no statistically significant difference in the static dynamic balance performance (FICSIT-4, FSST, TUGT, ER) after exercise program. Conclusion : As the results of the study shows closed kinematic chain exercise and proprioceptive neuromuscular facilitation exercise affect the improvement of hemiplegic patients'' static dynamic balance performance, it is supposed that these exercises could be therapeutic exercise program in clinical situations.

• Progress in Medical Physics
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• v.24 no.1
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• pp.76-83
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• 2013

Previous studies about effect of respiratory motion on diagnostic imaging and radiation therapy have been performed by monitoring external motions but these can not reflect internal organ motion well. The aim of this study was to develope the artificial pulmonary nodule able to perform non-invasive implantation to dogs in the thorax and to evaluate applicability of the model to respiratory motion studies on PET image acquisition and radiation delivery by phantom studies. Artificial pulmonary nodule was developed on the basis of 8 Fr disposable gastric feeding tube. Four anesthetized dogs underwent implantation of the models via trachea and implanted locations of the models were confirmed by fluoroscopic images. Artificial pulmonary nodule models for PET injected $^{18}F$-FDG and mounted on the respiratory motion phantom. PET images of those acquired under static, 10-rpm- and 15-rpm-longitudinal round motion status. Artificial pulmonary nodule models for radiation delivery inserted glass dosemeter and mounted on the respiratory motion phantom. Radiation delivery was performed at 1 Gy under static, 10-rpm- and 15-rpm-longitudinal round motion status. Fluoroscpic images showed that all models implanted in the proximal caudal bronchiole and location of models changed as respiratory cycle. Artificial pulmonary nodule model showed motion artifact as respiratory motion on PET images. SNR of respiratory gated images was 7.21. which was decreased when compared with that of reference images 10.15. However, counts of respiratory images on profiles showed similar pattern with those of reference images when compared with those of static images, and it is assured that reconstruction of images using by respiratory gating improved image quality. Delivery dose to glass dosemeter inserted in the models were same under static and 10-rpm-longitudinal motion status with 0.91 Gy, but dose delivered under 15-rpm-longitudinal motion status was decreased with 0.90 Gy. Mild decrease of delivered radiation dose confirmed by electrometer. The model implanted in the proximal caudal bronchiole with high feasibility and reflected pulmonary internal motion on fluoroscopic images. Motion artifact could show on PET images and respiratory motion resulted in mild blurring during radiation delivery. So, the artificial pulmonary nodule model will be useful tools for study about evaluation of motion on diagnostic imaging and radiation therapy using laboratory animals.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.7
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• pp.109-119
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• 2020

The purpose of this study was to provide basic data for improving health promotion behavior by identifying the effects of life stress and coping with stress among nursing college students on health promotion behavior. The data was collected from 352 nursing students in 6 colleges in B and K city, and the data was analyzed with SPSS/Win 23.0. Factors influencing health promotion behavior were school life satisfaction (F=9.18, p<.001), happiness score (F=20.64, p<.001), health status (F=12.40, p<.001), eating breakfast (t=-3.31, p=.001), unbalanced diet (t=-4.20, p<.001), time spent sleeping (F=2.64, p=.049), and exercise (t=5.20, p<.001). In the correlations, health promotion behavior was negatively correlated with life stress (r=-.289, p<.001), but it was positively correlated with coping with stress (r=.539, p<.001). The factors influencing health promotion behavior were stress coping (β=.439, p<.001), happiness score (β=.251, p<.001), exercise (β=.172, p<.001), unbalanced diet (β=.125, p=.002), life stress (β=-.121, p=.005), and eating breakfast (β=.083, p=.046). The above variables explained 46.0% for the health promotion behavior. Thus, in order to improve the health promotion behavior of nursing college students, integrated nursing interventions need to be developed through improving coping with stress, creating a sense of happiness, reducing life stress, and maintaining exercise and good eating habits.