• 대한감각통합치료학회지
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• 제20권3호
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• pp.60-71
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• 2022

목적 : 본 연구는 국내 장애 및 비장애 아동에게 적용된 그룹 감각통합치료 중재에 대해 정리하고 효과를 제시하고자 하였다. 연구방법 : 검색 기간은 2010년 1월부터 2021년 12월까지로 하였으며, 자료 검색을 위하여 '대한감각통합치료학회', '대한작업치료학회', '한국학술정보(KISS)', '학술연구정보서비스(RISS)', '디비피아(DBpia)'의 데이터베이스를 이용하였다. 총 11편이 선정되었으며, PICO(Patient, Intervention, Comparison, Outcome) 방법을 적용하여 체계적으로 정리하였다. 결과 : 연구 결과 단일 집단 비무작위 연구가 11편 중 8편(72.73%)으로 가장 많았다. 대상자는 99명으로 연령은 3세에서 11세까지였으며, 평균 7.39세였다. 그 중 장애아동이 더 많았으며, 진단은 발달장애가 99명 중 40명(40.41%)으로 가장 많았다. 치료 중재 회기는 총 5회에서 45회까지였으며, 주 1회 또는 2회, 시간은 60분 제공이 가장 많았다. 평가도구는 캐나다 작업 수행 측정(Canadian Occupational Performance Measure; COPM)과 또래 놀이 상호작용 평점 척도(Penn Interactive Peer Play Scale; PIPPS)가 각 4회(12.90%)로 가장 많이 사용되었다. 치료 중재 목표로는 사회 상호작용 기술이 8편(36.36%)으로 가장 많았다. 치료 중재 결과 8편의 연구에서 유의한 결과를 보였다. 결론 : 본 연구를 바탕으로 향후에는 높은 질적 수준을 근거로 한 다양한 그룹 감각통합치료의 중재 방법을 체계적으로 제시하여 임상에서 유용한 정보로 활용될 수 있기를 기대한다.

• Journal of information and communication convergence engineering
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• 제21권1호
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• pp.98-102
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• 2023

This paper presents a study on how augmenting semi-synthetic image data improves the performance of human detection algorithms. In the field of object detection, securing a high-quality data set plays the most important role in training deep learning algorithms. Recently, the acquisition of real image data has become time consuming and expensive; therefore, research using synthesized data has been conducted. Synthetic data haves the advantage of being able to generate a vast amount of data and accurately label it. However, the utility of synthetic data in human detection has not yet been demonstrated. Therefore, we use You Only Look Once (YOLO), the object detection algorithm most commonly used, to experimentally analyze the effect of synthetic data augmentation on human detection performance. As a result of training YOLO using the Penn-Fudan dataset, it was shown that the YOLO network model trained on a dataset augmented with synthetic data provided high-performance results in terms of the Precision-Recall Curve and F1-Confidence Curve.

• Neonatal Medicine
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• 제25권1호
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• pp.1-6
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• 2018

Extremely low birth weight infants remain at increased risk of intraventricular hemorrhage from the fragile vascular bed of the germinal matrix; the roles of hypotension (ischemia) and reperfusion (hyperemia) in the development of intraventricular hemorrhage are still debated. Cerebrovascular pressure autoregulation protects the brain by maintaining constant cerebral blood flow despite changes in blood pressure. The ontogeny of cerebrovascular pressure autoregulation has not been well established and uncertainty remains about the optimal arterial blood pressure required to support brain perfusion. Another important aspect of premature cerebral hemodynamics is the critical closing pressure--the arterial blood pressure at which cerebral blood flow ceases. Interestingly, in premature infants, the critical closing pressure approximates the mean arterial blood pressure. Often in this unique population, cerebral blood flow occurs only during systole when the diastolic arterial blood pressure is equal to the critical closing pressure. Moreover, the diastolic closing margin, a metric of cerebral perfusion that normalizes diastolic arterial blood pressure to the critical closing pressure, may be a better measure than arterial blood pressure for defining cerebral perfusion in premature infants. Elevated diastolic closing margin has been associated with intraventricular hemorrhage. This review summarizes the current state of understanding of cerebral hemodynamics in premature infants.

• Nuclear Engineering and Technology
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• 제37권2호
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• pp.139-150
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• 2005

A robust control design procedure for a nuclear reactor has been developed and experimentally validated on the Penn State TRIGA research reactor. The utilization of the robust controller as a component of an autonomous control system is also demonstrated. Two methods of specifying a low order (fourth-order) nominal-plant model for a robust control design were evaluated: 1) by approximation based on the 'physics' of the process and 2) by an optimal Hankel approximation of a higher order plant model. The uncertainty between the nominal plant models and the higher order plant model is supplied as a specification to the ,u-synthesis robust control design procedure. Two methods of quantifying uncertainty were evaluated: 1) a combination of additive and multiplicative uncertainty and 2) multiplicative uncertainty alone. The conclusions are that the optimal Hankel approximation and a combination of additive and multiplicative uncertainty are the best approach to design robust control for this application. The results from nonlinear simulation testing and the physical experiments are consistent and thus help to confirm the correctness of the robust control design procedures and conclusions.

• 한국추진공학회지
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• 제16권6호
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• pp.32-40
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• 2012

가스터빈 희박 예혼합 연소기에서 발생하는 연소 불안정의 고유 주파수 및 초기 성장률의 예측을 위하여 선형 열음향 해석 모델이 소개되었다. 모델 검증을 위하여 입출구 조건이 잘 정의되고, 상대적으로 이전 연구 결과에서 적용된 연소기에 비하여 구조가 간단한 모델 연소기가 선정되었다. 정의된 연소기에서 음향 해석을 위한 선형 관계식이 유도되었고, 이를 통하여 선형 안정성 해석 방안이 제시되었다. 해석 결과 연소 불안정의 특성에 대한 전체적인 변화 경향은 성공적으로 예측하였으나, 주파수의 절대값에 있어서는 실제 실험 결과보다 다소 작은 값을 예측하는 것으로 나타났다. 이러한 주파수의 예측 오차는 짧은 화염보다는 긴 화염에서 더욱 두드러지는 것으로 나타났다.

• 대한감각통합치료학회지
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• 제16권1호
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• pp.25-34
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• 2018

목적 : 본 연구는 학령전기 지적장애아동에게 제공한 그룹감각통합치료가 소근육 기능, 상호작용 및 놀이에 미치는 영향을 알아보고자 한다. 연구방법 : 지적장애 등록을 한 만3~5세 아동 4명을 대상으로 주 1회 90분씩, 총 12회기 실시하였다. 그룹감각통합치료는 평행놀이와 또래놀이 중심의 대근육 활동과 주제에 맞는 미술활동과 감각놀이로 구성하였다. 결과측정은 Erhardt Developmental Prehension Assessment(EDPA)와 또래놀이 상호작용 평점척도(Penn Interactive Peer Play Scale; PIPPS), 놀이다움(The Test of Playfulness; ToP)를 사용하여 대상자의 사전사후 소근육 기능과 상호작용, 놀이를 평가하였다. 측정 결과는 윌콕슨 순위 검정(Wilcoxon matched-pair signed rank test)을 사용하여 소근육 기능과 상호작용, 놀이의 중재 전후로 차이를 비교하여 분석하였다. 결과 : 그룹감각통합치료 후, 소근육 기능은 통계학적으로 유의한 차이를 보이지 않았으나, 상호작용과 놀이에서는 유의한 차이가 있었다(p<.05). 결론 : 그룹감각통합치료는 상호작용과 놀이능력 향상에 유용한 치료적 접근방법이라는 것을 알 수 있었으며, 지속적인 그룹 활동을 통하여 일상생활에서의 다양한 상황에 대한 일반화가 진행되길 기대한다.

• 한국육종학회지
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• 제40권1호
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• pp.15-21
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• 2008

It was previously pointed out that mutation is the ultimate source of variation. Adequate variation is needed for plant breeding if there is a limitation in natural genetic resources. When the ionizing radiation has been known to cause chromosomal and genomic alternations, it is widely used for inducing mutagenesis. The electron beam as an ionizing radiation is the principal physical mutagens that induces mutation and effectively used in plant breeding. Since dose-response relationships of electron beam in plant species are rarely known, we investigated the seed germination rate and early seedling growth of irradiated seeds of creeping bentgrass (Agrostis palustris Huds., cv Penn-A1) with various electron beam irradiating conditions (1, 1.3, 2 MeV at both 0.03 mA and 0.06 mA with dose of 100 Gy (Gray) and 0.03, 1, 1.3, 2 MeV at 0.03 mA with dose of 200 Gy, respectively) using electron accelerator at Korea Atomic Energy Research Institute. The growth parameters in terms of shoot length, primary root length, and secondary root length showed similar response between 0.06 / 1 (mA / MeV) at 100 Gy and 0.03 / 0.3 (mA / MeV) at 200 Gy. Bentgrass seed germination was mainly affected by the intensity of irradiated dose (Gray). Germination rate was lowered as the irradiated dose increased. On the other hand, early seedling growth was mainly governed not by the dose of radiation but by voltage.

• 한국보육지원학회지
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• 제13권3호
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• pp.1-17
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• 2017

Objective: The purpose of this study was to analyze the effects of preschoolers' negative emotionality on their peer play behaviors, focusing on the mediation of behavioral problems. Methods: The study sample included 287 preschoolers aged 3 to 5 attending child care centers located in Seoul, Korea. The instruments used in this study were the Child Behavior Questionnaires (CBQ), Child Behavior Checklist (CBCL), and Penn Interactive Peer Play Scale (PIPPS). Results: The main results of this study are as follows: First, boys and girls' negative emotionality exerted positive effects on their behavioral problems. Second, boys and girls' negative emotionality had a positive influence on their play interaction, play disruption, and play disconnection. Further, the effect of boys' negative emotionality on their play disruption and play disconnection was totally mediated by their behavioral problems, and girls' negative emotionality on their play interaction and play disconnection was totally mediated by their behavioral problems. Conclusion/Implications: These findings provide preliminary evidence that the relationships between preschoolers' negative emotionality and peer play behaviors may be mediated by their behavioral problems.

• 한국자기학회지
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• 제25권5호
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• pp.149-155
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• 2015

자성박막의 미세패턴 소자 제작을 위해 전자 사이크로트론 공명(electron cyclotron resonance; ECR) Ar 이온밀링 시스템을 제작하였다. 소자 식각에 적용한 ECR 이온밀링 시스템에서 주파수 2.45 GHz 파장 12.24 cm의 마이크로파 소스인 마그네트론은 전력 600 W에 의해 가동되어 파장의 정수배에 맞추어 만든 도파관을 통하여 전달되도록 설계하였다. 마이크로파 주파수와 공명시키기 위해 전자석으로 908 G의 자기장을 인가하였고, 알곤 개스를 cavity에 유입시켜서 방전된 이온들은 그리드 사이에 인가한 약 1000 V의 가속전압에 의한 에너지를 갖고 표면을 밀링한다. 이것을 이용하여 다층구조 GMR-SV(giant magnetoresistance-spin valve) 자성박막에 광 리소그래피, 이온밀링 및 전극제작 공정과정을 마치고 폭이 $1{\mu}m$에서 $9{\mu}m$까지의 소자들을 제작하여 광학현미경으로 소자 크기를 관찰하였다.

• 대한통합의학회지
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• 제10권1호
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• pp.119-128
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• 2022

Purpose : The purpose of this study was to examine the effects of applying occupational therapy that uses motion recognition on the physical self-efficacy, visual-motor integration ability, and play skills of children who have neurodevelopmental disorder before and after treatment. Methods : This The study chose 16 children with neurodevelopmental disorder as research subjects who were randomly and evenly allocated into an experimental group and a control group. The experiment followed a pretest-posttest design. As an intervention, the experimental group received motion recognition-based occupational therapy and a separate sensory integration program. The control group only participated in the separate sensory integration program. The eight-week experiment duration included 24 intervention sessions where the a 50-minute session was implemented three times a week for eight weeks. To compare the physical self-efficacy, visual-motor integration ability, and play skills before and after the intervention, measurement tools including the Physical self efficacy, Beery VMI-6, and Penn interactive peer play scale were used. All measured variables were analyzed and expressed as mean, standard deviation and percentage. Results : The motion recognition-based occupational therapy demonstrated a significant effect on improving the physical self-efficacy, visual-motor integration ability, and play skills of the experimental group. The intervention also caused a significant difference between the experimental group and control group in terms of the physical self-efficacy, visual-motor integration ability, and play skills. Conclusion : We confirmed the possibility motion recognition-based occupational therapy could be effective in improving the physical self-efficacy, visual-motor integration ability, and play skills for patients who have neurodevelopmental disorder. Based on the study result, further future studies are expected based on this study result that prove the application effect of the motion recognition-based occupational therapy using disabled and non- disabled children as subjects are expected in the future.