• 대한음성학회:학술대회논문집
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• 대한음성학회 2003년도 5월 학술대회지
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• pp.119-122
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• 2003

In general, triangular shape filters are used in the filter bank when we get the MFCCs from the spectrum of speech signal. In [1], a new feature extraction approach is proposed, which uses specific filter shapes in the filter bank that are obtained from the spectrum of training speech data. In this approach, principal component analysis technique is applied to the spectrum of the training data to get the filter coefficients. In this paper, we carry out speech recognition experiments, using the new approach given in [1], for a large amount of telephone speech data, that is, the telephone speech database of Korean connected digit released by SITEC. Experimental results are discussed with our findings.

• 전자공학회논문지
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• 제51권8호
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• pp.66-74
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• 2014

최근에 한국어 의존 관계에 대한 파싱 시스템과 관련된 연구가 소프트웨어 공학자들이나 언어학자들에 의해 다양하게 연구되고 있으며, 시스템 구현은 주로 기계 학습이나 기호 주의를 사용하고 있다. 기계 학습을 사용한 방법은 한국어 문장 데이터가 매우 크기 때문에 시스템 특성상 매우 긴 학습시간을 가지며, 데이터 자체가 가지는 오류로 인하여 한정된 인식율을 가진다. 본 연구에서는 기계학습을 이용한 시스템에 대하여 학습 시간을 줄일 수 있도록 특징들을 자질 집합 모듈로 분할하여 처리하는 방법을 제안하고, 문장수와 반복횟수에 따른 인식율을 분석하였다. 설계된 시스템은 분리된 모듈과 이진 검색을 위한 정렬 기법이 사용되었다. 데이터는 세종 말뭉치로부터 추출한 후 정제된 36,090문장을 사용하였다. 학습 시간은 약 3시간으로 줄었으며, 인식율은 10,000 문장을 50회 학습하였을 때 84.54%로 가장 높았다. 모든 학습 문장(32,481)을 10회 학습하였을 때 인식율은 82.99%이다. 결과적으로 정제된 데이터를 이용하여 시스템이 안정화될 때까지 반복하는 것이 더 효율적이었다.

• 실천공학교육논문지
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• 제9권1호
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• pp.49-56
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• 2017

최근 Industry 4.0으로 인해 제조업에 대한 생산성 향상과 고객만족을 위한 스마트팩토리 관심이 매우 높고 정부 지원에 따른 구축도 활발하다. 특히, 효율적인 생산 시스템을 구축하기 위한 데이터 통합과 이를 위한 필드버스 통신기술은 필수적이다. 필드버스는 특정 밴더 시스템에 구속받지 않는 개방형 제어시스템으로서 타사 제품과의 호환성, 데이터 전송의 정확성, 원격진단 등의 다양한 이점을 가지고 있다. 그러나, 필드버스를 학습하기 위한 교육 장비와 실습을 위한 교육과정 및 예제가 전무하여 산업현장에서 스마트팩토리 구축을 위해 필요로 하는 실무 능력 향상에 많은 제한점이 있다. 따라서 본 연구는 국내 산업현장에 적합한 PLC와 통신기술을 선정한 선행연구 결과를 바탕으로 실무적인 필드버스 교육을 위한 PLC기반의 필드버스 교육 장비와 교육과정을 개발하고 Ethernet IP, Profibus DP, Modbus, CC-Link, Device Net의 다양한 필드버스를 구현하였다. 또한, Ethernet IP를 통한 데이터 수집과 모니터링으로 분산된 필드기기의 제어와 원격진단이 가능함을 확인하였다.

• 한국의학물리학회지:의학물리
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• 제33권4호
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• pp.136-141
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• 2022

Purpose: This study aimed to develop a breath control training system for breath-hold technique and respiratory-gated radiation therapy wherein the patients can learn breath-hold techniques in their convenient environment. Methods: The breath control training system comprises a sensor device and software. The sensor device uses a loadcell sensor and an adjustable strap around the chest to acquire respiratory signals. The device connects via Bluetooth to a computer where the software is installed. The software visualizes the respiratory signal in near real-time with a graph. The developed system can signal patients through visual (software), auditory (buzzer), and tactile (vibrator) stimulation when breath-holding starts. A motion phantom was used to test the basic functions of the developed breath control training system. The relative standard deviation of the maxima of the emulated free breathing data was calculated. Moreover, a relative standard deviation of a breath-holding region was calculated for the simulated breath-holding data. Results: The average force of the maxima was 487.71 N, and the relative standard deviation was 4.8%, while the average force of the breath hold region was 398.5 N, and the relative standard deviation was 1.8%. The data acquired through the sensor was consistent with the motion created by the motion phantom. Conclusions: We have developed a breath control training system comprising a sensor device and software that allow patients to learn breath-hold techniques in their convenient environment.

• 대한공간정보학회지
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• 제24권1호
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• pp.121-128
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• 2016

많은 연구들에서 영상자료와 분류 알고리즘 측면에서 분류정확도를 비교하였지만, 참조자료 또는 분석자에 의존하는 훈련샘플에 의한 분류정확도 비교와 관련된 연구는 부족한 실정이다. 본 연구는 감독분류에 있어 훈련샘플로써 지상 분광반사자료의 유용성을 평가하고자 하였다. 이를 위하여 초분광영상과 다중분광영상을 대상으로 영상 수집 훈련샘플과 지상 분광반사자료를 사용하여 분류 정확도를 비교하였다. 그 결과 영상 수집 훈련샘플 사용 시 초분 광영상과 다중분광영상에서 공통적으로 약 90%의 분류정확도를 얻을 수 있었다. 그러나 지상 분광반사자료를 훈련 샘플로 사용하면 초분광영상의 경우 약 10%p, 다중분광영상의 경우 약 20%p의 분류정확도 감소가 발생하였다. 특히 다중분광영상에서 분광반사특성이 유사하게 나타나는 클래스들의 경우 분류정확도가 초분광영상에 비해 매우 낮게 나타났다. 따라서 지상 분광반사자료는 다중분광영상에 적용하는 데에는 한계가 있지만, 초분광영상을 이용한 토지피복분류에 있어 유용한 훈련샘플이 될 수 있다.

• 한국간호교육학회지
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• 제21권4호
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• pp.550-560
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• 2015

Purpose: The purpose of this study was to identify the teaching effectiveness and adequacy of practical training in nursing students. Methods: This descriptive research was conducted using a convenience sampling. The sample consisted of 619 nursing students with experience in practical training among five colleges, located in four cities. The data collection was performed using self-reported questionnaires. Research tools, developed by Kim (1996), were used to measure the effectiveness of clinical instructors and the adequacy of practical training developed by researchers. The data was analyzed using SPSS 20.0. Results: The average of teaching effectiveness was 3.43 (out of 5) and adequacy of practical training was 3.33 (out of 5). Teaching effectiveness and adequacy of practical training showed a significant positive correlation (r=.74, p<.001). Teaching effectiveness and each sub-area: adequacy of practical training, practical contents (r=.59, p<.001), practical attitude (r=.45, p<.001), practical instructor (r=.62, p<.001), practical environment (r=.46, p<.001), and practical evaluation (r=.64, p<.001), revealed a significant positive correlation. Conclusion: Nursing students prefer the actual training from professors who are more professional and clinical experienced. Professors presenting the theory lectures should also be aware of clinical practice so that education can be more professional and effective in terms of clinical practice.

• 대한물리의학회지
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• 제13권2호
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• pp.137-145
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• 2018

PURPOSE: The purpose of this study was to investigate the effect of action observational physical training with rhythmic auditory stimulation on muscle activity and gait ability in patients with stroke. METHODS: Twenty-six chronic stroke patients participated in this study were assigned into three groups, experimental group 1 (10% faster tempo rhythmic auditory stimulation with action observation training) n=8, experimental group 2 (average tempo rhythmic auditory stimulation with action observation training) n=9, and control group (action observation training) n=9. In this experiment, the corresponding exercise were applied into the subjects of three group for 30 minute a day, 3 time a week during 4 weeks. All participants were measured to muscle activity of lower limb, 10 meter walking test, Figure of 8 walk test, Dynamic gait Index. The collected data were analyzed by using SPSS (version 18.0 for window) and verified that each data was a normal distribution based on Shapiro-Wilk test. Between-group and within-group comparison was analyzed by using One-way ANOVA test, Paired t-test respectively. In all statistical analyses, significance level, ${\alpha}$ was set by .05. RESULTS: The above results revealed that the all experimental group 1 and experimental group 2 and control group were all effective to improve the lower limb muscle activities, gait ability. However more positive effects shown action observational physical training with rhythmic auditory stimulation experimental group. CONCLUSION: This study suggest that action observation physical training with rhythmic auditory stimulation is effective intervention for improvement of muscle activity and walking ability in chronic stroke patients.

• 한국지구과학회지
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• 제38권1호
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• pp.11-23
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• 2017

풍력 자원의 단기 예측 가능성은 풍력 발전 단지의 경제적 타당성을 평가하는 중요한 요소이다. 본 연구에서는 풍력 자원의 단기 예측 가능성을 향상시키는 방법의 하나로 베이지안 칼만 필터를 후처리 과정으로 적용하였다. 이때 추정된 모델과 관측 데이터의 상관관계를 평가하기 위하여 일정 시간 동안 베이지안 칼만 훈련 기간이 요구된다. 본 연구는 여러 훈련 기간에 따라 예측 특성을 정량적으로 분석하였다. 태백 지역에서는 3일 단기 베이지안 칼만 훈련으로 기온과 풍속을 예측하는 것이 다른 훈련 기간을 적용할 때보다 우수한 예측 성능을 보였다. 반면 이어도는 6일 이상의 베이지안 칼만 필터의 훈련 기간을 적용한 경우 가장 좋은 예측 성능을 나타낸다. WRF 예측 성능이 떨어지는 사례에서 베이지안 칼만 필터의 예측 성능향상이 뚜렷하게 나타나며, 반대로 WRF 예측이 정확한 지점에서는 필터적용에 따른 성능향상 정도가 약한 경향을 가진다.

• 대한물리치료과학회지
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• 제19권3호
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• pp.23-30
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• 2012

The purpose of this study was to apply treadmill training through motor learning to cerebral palsy children and examine its effects on their Gross Motor Functions. The subjects of this study were 13 spastic diplegia children who had difficulty in independent gait, and GMFCS level III, IV. We performed treadmill gait training using the principle of weight bearing, based on 4times a week for 30 minutes before and after each session physical therapy we gave weight bearing treadmill training 5 to 10 minutes, during 7 weeks(April 9, 2012~May 26, 2012) fittingly for the children's gait characteristics. In order to test how the weight bearing treadmill training affects spastic diplegia children's gross motor functions, we measured body mobility with Gross Motor Function Measure (GMFM). These data were collected before and after the experiment and analyzed through comparison. Data collected from the 13 spastic diplegia children the results were as follows. For evaluating with regard to change in body mobility, significant difference was observed between before and after the experiment in measured gross motor functions, which were crawling, kneeling, standing, walking, jumping and running(p<0.05). According to the results of this study, when gait training through motor learning was applied to spastic cerebral palsy children, it made significant changes in their body mobility. Accordingly, for the effective application of gait training through motor learning to cerebral palsy children, it is considered necessary to make research from different angle on how such training affects children's mobility, activity of muscles in the lower limbs, and gait characteristics.

• 한국응급구조학회지
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• 제16권1호
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• pp.91-101
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• 2012

Purpose: This study aims to assess the influencing factors on the level of satisfaction with clinical training and to provide basic data for more efficient clinical training. Method: The study was conducted on 402 paramedic students who have experienced clinical training from September 6 until October 12 in 2011. The questionnaires consisted of 40 questions. We used SPSS 18.0 frequency analysis, technical statistics, t-test, ANOVA, Pearson's correlation coefficients and multiple regression analysis. Result: 1. The level of satisfaction with clinical training showed significant difference between the frequency (F=8.837, p=.000) and clinical training managers (F=5.418, p=.001). 2. The level of satisfaction with clinical training showed the strongest positive correlation with the satisfaction of clinical training hospitals (r=.694, p=.000). 3. Multiple regression analysis revealed the most powerful predictor for satisfaction with clinical training was the satisfaction level of clinical training hospitals(48.2%) and the frequency of clinical training experiences(.8%), the preparation before the clinical training(5.4%), the total duration of clinical training(.7%), and the satisfaction of emergency department education(1.0%). These five variables accounted for 56.1% of the satisfaction of clinical training among paramedic students. Conclusion: As student's satisfaction of the clinical training increases, the quality of paramedics is expected to improve in the future. As a result, the future paramedics can be nurtured to be highly skilled in on-the-scene emergency situations after graduation.