• 한국전자통신학회논문지
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• 제14권6호
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• pp.1249-1256
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• 2019

본 논문에서는 보청기의 음향궤환 및 잡음을 제거하기 위한 새로운 알고리즘을 제안한다. 이 알고리즘은 기존의 FIR 구조를 이용하는 대신 신경망 적응예측필터를 이용한 심층학습 알고리즘으로 궤환 및 잡음제거 성능을 향상시킨다. 먼저 궤환제거기가 마이크 신호에서 궤환신호를 제거하고, 이어서 Wiener 필터기법을 이용하여 잡음을 제거한다. 잡음 제거는 음성신호가 가진 주기적 성질에 따라 선형예측모델을 이용하여 잡음이 포함된 음성신호로부터 음성을 추정해내는 것이다. 한 루프 안에 포함된 두 적응 시스템의 안정적 수렴을 보장하기 위해 궤환제거기 및 잡음제거기의 계수 업데이트를 분리하여 실시하며 제거 후 생성된 잔차신호를 이용하여 수렴시키는 과정을 진행한다. 본 연구에서 제안한 궤환 및 잡음제거기의 성능을 검증하기 위하여 시뮬레이션 프로그램을 작성하고 모의실험을 수행하였다. 실험 결과, 제안한 심층학습 알고리즘을 사용하면 기존의 FIR 구조를 사용하는 경우보다 궤환제거기에서 약 10 dB의 SFR(: Signal to Feedback Ratio), 잡음제거기에서 약 3 dB의 SNRE(: Signal to Noise Ratio Enhancement) 개선효과를 얻을 수 있는 것으로 확인되었다.

• 건축역사연구
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• 제15권4호
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• pp.7-22
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• 2006

The purpose of this study is proposing a method of developing experience program for organizing continuous 'Recreating Cultural and Traditional Village'. Therefore, with having purpose of developing experience program which is deeply related with residents organization and architecture in the village, the researcher has participated in '2005 An-dong Gunjamaul Recreating Cultural and Traditional Village', accomplished developing experience program which can continuously manageable by residents and space and facilities which are accompanied with program. The results of this research are as follows. The developing process of experience program has four phases, selecting program, planning program, growing and changing program, and practicing and firmly establishing program. Moreover, the relationships between space planning and setting up a resident's organization and the experience program need to be considered. The things that experts have to consider are come up with three subjects. First, planning experience program with citizen participation. Second, designing experience program with spaces which will contain the programs. Third, developing programs which are accompanied with rediscover village's resources through continuous feedback.

• Nuclear Engineering and Technology
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• 제51권6호
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• pp.1540-1553
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• 2019

A nuclear power plant (NPP) is a highly complex system-of-systems as manifested through its internal systems interdependence. The negative impact of such interdependence was demonstrated through the 2011 Fukushima Daiichi nuclear disaster. As such, there is a critical need for new strategies to overcome the limitations of current risk assessment techniques (e.g. the use of static event and fault tree schemes), particularly through simulation of the nonlinear dynamic feedback mechanisms between the different NPP systems/components. As the first and key step towards developing an integrated NPP dynamic probabilistic risk assessment platform that can account for such feedback mechanisms, the current study adopts a system dynamics simulation approach to model the thermal dynamic processes in: the reactor core; the secondary coolant system; and the pressurized water reactor. The reactor core and secondary coolant system parameters used to develop system dynamics models are based on those of the Palo Verde Nuclear Generating Station. These three system dynamics models are subsequently validated, using results from published work, under different system perturbations including the change in reactivity, the steam valve coefficient, the primary coolant flow, and others. Moving forward, the developed system dynamics models can be integrated with other interacting processes within a NPP to form the basis of a dynamic system-level (systemic) risk assessment tool.

• 한국콘텐츠학회논문지
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• 제12권3호
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• pp.25-33
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• 2012

본 연구에서는 자세균형 훈련 효과를 향상시킬 수 있는 게임 콘텐츠를 적용한 시각 피드백 자세균형 훈련 프로그램을 이용하여 정상 20대 성인을 대상으로 자세균형 조절 능력의 향상에 관한 유효성을 검증하고자 한다. 힘판 기반 자세균형 훈련 장치를 이용하여 23명의 피험자들이 일주일에 3일, 하루에 15분씩 4주간의 자세균형 훈련을 받았다. 게임기반의 시각 피드백 자세균형 훈련에 대한 평가는 Balance SD(Biodex, medicalscience Inc., USA)의 자세 균형 평가를 통하여 자세안정성과 자세한계성을 분석하였으며, 실험자의 자세균형 능력의 증진을 통한 유효성을 검증하였다. 그 결과 자세안정성과 자세한계성 모두 훈련 전후로 유의한 차이가 있었음을 확인하였다(p<0.05). 이번 연구 결과는 게임기반의 시각 피드백 자세균형 훈련이 자세균형 능력 향상을 위한 운동에 적용될 수 있음을 의미하며, 향후 다양한 자세균형 훈련의 프로그램 종류, 강도 및 각 질환별 최적 콘텐츠 개발에 대한 정량적인 데이터 수집 및 분석연구가 필요하다.

• 수산해양교육연구
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• 제27권3호
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• pp.791-803
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• 2015

This study aims to examine the influence of tennis instructors' coaching behaviors on the satisfaction with lessons and preference for instructors. In order to achieve this study objective, by using the quota sampling out of nonprobability sampling for tennis club members who are now(2015) actively involved in tennis courts located in Daejeon Metropolitan City and Chungcheongnam-do, and also receiving tennis lesson for more than six months or used to take lessons before, the 325 effective samples were used for data analysis. Using the SPSS Ver. 21.0 Window Program, the collected data went through frequency analysis, exploratory factor analysis, reliability analysis, t-test, one-way ANOVA, correlation analysis and multiple regression analysis, and the results are like below. Regarding differences of coaching behaviors depending on sex, first, there were significant differences in the factors like explanatory instruction, positive feedback and negative feedback. In case of differences in accordance with age, every factor showed significant differences. In regard of differences depending on academic background, there were differences in the factor of negative feedback while the factor of positive feedback showed differences in accordance with the experience of lesson. In case of differences depending on the level of athletic performance, there were statistically significant differences in the factors like explanatory instruction, questioning instruction and negative feedback. Second, the positive feedback, one of the sub-factors of coaching behaviors had positive influence on satisfaction with lesson while the explanatory instruction, one of the sub-factors of coaching behaviors had positive influence on preference for instructors. Lastly, the satisfaction with lesson had positive influence on preference for instructors.

• 디지털융복합연구
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• 제17권11호
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• pp.305-313
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• 2019

본 연구는 간호대학생을 대상으로 자율실습에서 형성적 피드백을 적용한 후 학생의 실습만족도, 학습동기 및 학업적 자기효능감에 미치는 효과를 확인한 비동등성 대조군 전후설계의 유사실험연구이다. 본 연구는 경인지역에 소재한 대학의 간호대학생 37명을 실험군으로 하여 교수자에 의한 형성적 피드백을, 전북지역에 소재한 대학의 간호대학생 41명을 대조군으로 하여 동영상 촬영 후 동료피드백을 적용하였다. 중재를 적용하기 전과 후에 자료수집을 하였고, 수집된 자료는 SPSS/WIN 22.0 프로그램을 이용하여 분석하였다. 연구 결과, 실험군이 대조군에 비해 실습만족도(t=-2.79, p=.007) 및 학업적 자기효능감(t=2.30, p=.024)은 유의하게 향상되었으나 학습동기는 통계적으로 유의하지 않았다. 이는 기존에 동영상 촬영 후 동료피드백을 제공하는 것보다 교수자에 의한 형성적 피드백을 제공하는 것이 더 효과적임을 확인하였다는 점에서 의의가 있다. 따라서 교수자들은 자율실습에서 간호학생들의 핵심기본간호술기 습득을 위하여 형성적 피드백을 적용하는 것을 고려할 필요가 있다.

• 대한물리치료과학회지
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• 제29권2호
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• pp.1-13
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• 2022

Background: This research was conducted to understand balance training in trunk control, balance, and walking in stroke patients. Design: Randomized controlled trial. Methods: The subjects included 40 stroke patients, of whom 20 undertook balance training using visual information and the other 20 undertook balance training using balance boards. Using visual feedback, the balance training group used a training program within the static balanced evaluation tool, while the balance training group trained using a balance board. All subjects underwent 20 mins of neurodevelopmental treatment, and both target groups underwent 10 mins each of balance training by using either visual feedback or a balance board. The treatment period lasted a total of 4 weeks, twice a day. Trunk control before and after training was evaluated with the Trunk Impairment Scale. Balance capability was assessed by the Berg Balance Scale, Functional Reach Test, Timed Up and Go test, and Static balance measurement tool. Walking capacity was measured using gait measuring equipment, and cadence and velocity were measured. Results: Both groups showed a significant improvement in their interstitial control, balance, and gait ability after the experiments compared to before the experiments (p<0.05). The difference between the two groups was not significant. The visual feedback balance training group showed a more substantial improvement than the balance board training group. Conclusion: In this study, we found that the balance training combined with visual feedback contributes to improving trunk control, balance, and gait in patients with hemiplegia due to stroke. In addition to this, I believe that balanced training combined with visual feedback can be used as a training method when considering patients who lack interstitial control, balance, and gait ability.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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• pp.365-370
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• 2001

This study is the selection of optimum forming condition for RP system using ADS. Program using ADS reduces the required time for feedback between design and manufacturing of workpiece. When we produce rapid prototype using RP system, we investigate the relationship between Facetres in system variable number of AutoCAD and circularity of rapid prototype, and we will find optimum forming condition in RP system.

• International Journal of Contents
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• 제10권3호
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• pp.55-63
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• 2014

Existing science education that excludes narrative thinking impedes the understanding of the context of workbook content. The object of this research is to develop a storytelling-learning program based on narrative thinking to elevate learners' interest in science and expand their inventive problem-solving abilities. Following an analysis of the current Korean curriculum, eight types of storytelling materials that utilize local content were developed for grades 7-9. The learning program used quest storytelling and was designed such that learning activities such as investigation, discussion, and experimentation were included in the process of solving each quest. Learners experienced an interest in storytelling learning resulting from participation in this storytelling-learning program. Moreover, learners demonstrated inventive problem-solving abilities in the process of completing the stories. During the process of assembling the storytelling materials, the students interacted with enthusiasm and generated ideas. The teachers indicated a positive feedback to the storytelling program as a new attempt to stimulate learners' interests. In the future, with continuous development and application, storytelling-science-learning programs that base science learning on narrative thinking are expected to be successful.

• 아동학회지
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• 제27권1호
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• pp.45-65
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• 2006

This study was conducted with the aim of improving sibling relationships of children based on a filial therapy program. Three pairs of young children with problematic behavior regarding sibling relationships participated in this study along with their mothers. The program consisted of four main courses : an instructional course for the mother, a play therapy course, a feedback course, and an evaluation course. The program was conducted in ten weekly 2-hour sessions. Results showed positive changes in mother-child and sibling interactions in all three cases. It was concluded that the program was effective in developing proper sibling relationships through enhancing mother-child interactions.