• Structural Engineering and Mechanics
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• 제38권3호
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• pp.283-300
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• 2011

A new conception of fundamental tasks in dynamics of the bridge-track-train systems (BTT), with the aim to evaluate moving load's models adequacy, has been developed. The 2D physical models of BTT systems, corresponding to the fundamental tasks, have been worked out taking into account one-way constraints between the moving unsprung masses and the track. A method for deriving the implicit equations of motion, governing vibrations of BTT systems' models, as well as algorithms for numerical integration of these equations, leading to the solutions of high accuracy and relatively short times of simulations, have been also developed. The derived equations and formulated algorithms constitute the basis for numerical simulation of vibrations of the considered systems.

• Structural Engineering and Mechanics
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• 제38권3호
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• pp.301-314
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• 2011

The paper constitutes the second part of the author's study. The first part (Podworna 2010) formulates four fundamental tasks in dynamics of the bridge-track-train systems. The following cyclic moving loads are considered: a concentrated forces stream (model P), an unsprung masses stream (model M), a single-mass viscoelastic oscillators stream (model $M_o$) and a double-mass viscoelastic oscillators stream (model $MM_o$). Three problems precluding to the numerical simulations have been developed, i.e., prediction of the forced resonances, the parameters of integration of equations of motion, the output results. A computer programme was written in Pascal and numerical research in the scope of the fundamental tasks was worked out. The investigations were focused on adequacy evaluation of the moving load models, P, M, $M_o$, $MM_o$, in predicting dynamic processes in railway bridges.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제5권2호
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• pp.87-98
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• 2001

The Center for Science Gifted Education (CSGE) of Chongju National University of Education was established in 1998 with the financial support of the Korea. Science & Engineering Foundation (KOSEF). In fact, we had prepared mathematics and science gifted education program beginning in 1997. It was possible due to the commitment of faculty members with an interest in gifted education. Now we have 5 classes in Mathematics, two of which are fundamental, one of which is a strengthened second-grade class gifted elementary school students, and one a fundamental class, and one a strengthened class for gifted middle school students in Chungbuk province. Each class consists of 16 students selected by a rigorous examination and filtering process. Also we have a mentoring system for particularly gifted students in mathematics. We have a number of programs for Super-Saturday, Summer School, Winter School, and Mathematics and Science Gifted Camp. Each program is suitable for 90 or 180 minutes of class time. The types of tasks developed can be divided into experimental, group discussion, open-ended problem solving, and exposition and problem solving tasks. Levels of the tasks developed for talented elementary students in mathematics can be further divided into grade 5 and under, grade 6, and grade 7 and over. Types of the tasks developed can be divided into experimental, group discussion, open-ended problem solving, and exposition and problem solving task. Also levels of the tasks developed for talented elementary students in mathematics can be divided into the level of lower than grade 5, level of grade 6, and level of more than grade 7. Three tasks developed and practiced are reported in this article.

• 말소리와 음성과학
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• 제2권4호
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• pp.223-228
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• 2010

This study investigated the closed quotient and other voice quality parameters using electroglottography (EGG) in sustaining the vowel /a/ and reading a sentence at the comfortable pitch and loudness in healthy Korean adults. Seventy two healthy adults (36 men, 36 women) aged 20~40 years were included in the study. The tasks were recorded and analyzed using Lx Speech Studio. In vowel sustaining task, closed quotient (Qx), fundamental frequency (Fx), sound pressure level (SPL), Jitter, and Shimmer were measured. In sentence reading task, closed quotient (DQx), fundamental frequency (DFx), and sound pressure level (DAx) were measured. The sex effects were observed on Qx, Fx, Shimmer, DQx, and DFx. Men had significantly higher Qx and DQx than women, but had significantly lower Shimmer than women. However, there was no sex effect on Jitter. The task effects on Qx and SPL as well as DQx and DAx were also assessed. Qx and SPL were significantly higher than DQx and DAx in both gender. This study showed that the closed quotients in both vowel sustaining and sentence reading tasks were significantly related to other voice quality parameters. Therefore, clinicians and researchers should describe the voice quality parameters like fundamental frequency, sound pressure level, Jitter, Shimmer, and so on when reporting closed quotients using EGG.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2012년도 하계학술대회
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• pp.164-166
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• 2012

In this paper, we proposed a method for extracting predominant melody of polyphonic music based on harmonic structure. Harmonic structure is an important feature parameter of monophonic signal that has spectral peaks at the integer multiples of its fundamental frequency. We extract all fundamental frequency candidates contained in the polyphonic signal by verifying the required condition of harmonic structure. Then, we combine those harmonic peaks corresponding to each extracted fundamental frequency and assign a rank to each after calculating its harmonic average energy. We run pitch tracking based on the rank of extracted fundamental frequency and continuity of fundamental frequency, and determine the predominant melody. For the query by singing/humming (QbSH) task, we proposed Dynamic Time Warping (DTW) based matching engine. Our system reduces false alarm by combining the distances of multiple DTW processes. To improve the performance, we introduced the asymmetric sense, pitch level compensation, and distance intransitiveness to DTW algorithm.

• 말소리와 음성과학
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• 제15권4호
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• pp.53-60
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• 2023

본 연구에서는 음성장애 환자에서 음성 범위 프로파일(voice range profile, VRP)과 말 범위 프로파일(speech range profile, SRP)을 이용한 추정 발화 기본주파수 절대 오차(absolute error of estimated speaking fundamental frequency, AEF0)를 음성장애의 병인 집단 간에 비교하여 차이를 확인하고,각 병인 집단 별로 AEF0와 관련된 변수들 간의 상관관계를 살펴보고자 하였다. 연구대상은 음성장애로 진단된 기능적(functional, FUNC), 기질적(organic, ORGAN), 신경학적(neurogenic, NEUR) 음성장애 환자군과 정상군(normal control, NC) 각 30명(남 15명, 여 15명)으로 총 120명이었다. 각 대상자로 하여금 음성, 말 범위 프로파일 과제를 수행하도록 하고 전기성문파형검사(electroglottography, EGG)를 통해 발화 기본주파수를 측정하였다. 병인 집단 간 AEF0의 비교 결과, Grade와 Severity는 병인 집단 간 차이가 없었던 반면, AEF0_VRP와 AEF0_SUM에서 병인 집단 간 차이가 있어 AEF0_VRP는 ORGAN이 FUNC와 NC보다 높았으며, AEF0_SUM은 ORGAN이 NC보다 높았다. 또한 FUNC와 NEUR에서는 AEF0가 Grade와 양의 상관관계를 보인 반면, ORGAN은 CQ(closed quotient)와 양의 상관관계가 있었다. 따라서 병인 집단에 따라 AEF0의 적용과 관련 음성 변수를 살펴보는 데 주의를 기울여야 할 것으로 보이며, 본 연구는 이러한 임상적 판단에 대한 기초 자료를 마련하는 데 일조한 것으로 여겨진다.

• 한국보건간호학회지
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• 제32권3호
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• pp.424-437
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• 2018

Purpose: This study was to conducted to search for factors influencing the confidence of core fundamental nursing skill performance (CC) based on comparative analysis, of the relationship between problem solving ability (PS), self-directed learning ability (SL) and CC of nursing students. Methods: This study was conducted based on questionnaires (208) given to senior nursing students. Data were analyzed by the t-test, ANNOVA and Scheffe's test. Moreover, Pearson's correlation coefficient and hierarchical regression were conducted to determine the relationship between items. Results: Proving Solving ability differed significantly in SC. In addition, satisfaction with core fundamental nursing skills (SL) differed significantly by gender, academic performance of last semester, support for nursing, and SC. Moreover, PS was found to have a normal relationship with SL and CC, and SL was found to have a normal relationship with CC. Conclusion: Education strategy should include methods of increasing the PS of student to improve CC in nursing education. Moreover, SL education should be used to increase nursing tasks and effective adaptation to their circumstances as a clinical nurse after graduation.

• 인간행동과 음악연구
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• 제12권2호
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• pp.1-18
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• 2015

본 연구의 목적은 뇌성마비 성인과 일반 성인에게 각각 동일한 발화과제(일반, 리듬, 선율 발화)를 제공한 뒤 집단(일반 및 뇌성마비 성인)과 발화과제에 따라 어떠한 음성 특성이 나타나는지 알아보는 것이다. 연구대상은 뇌성마비 성인 20명과 일반 성인 20명이며 프라트(Praat) 프로그램을 사용하여 발화과제에 따른 기본주파수, 음성강도, 주파수 변동률, 진폭 변동률수치를 구하였다. 각 집단의 발화 과제에 따른 음성 특성 분석 결과, 기본주파수와 음성강도의 경우 두 집단 모두 유의한 차이는 없었으나 주파수 변동률 및 진폭 변동률의 경우 일반성인집단과 뇌성마비성인집단 모두 선율 발화 시 유의하게 가장 낮은 수치를 보였다. 집단에 따른 차이를 분석한 결과, 뇌성마비성인집단의 주파수 변동률 및 진폭 변동률이 일반성인집단에 비해 유의하게 높은 수치를 보였다. 또한 일반성인집단과는 달리 뇌성마비성인집단의 경우 리듬 발화 시 주파수 변동률 및 진폭 변동률 수치가 가장 높게 나타났으며 주파수변동률의 경우 집단과 발화과제 종류에 따른 상호작용 효과가 유의해 두 집단 사이에 상이한 양상이 발견되었다. 본 연구는 발화 시 적용된 음악요소에 따라 나타나는 즉각적 음성 특성에 대한 정보를 제공해주는 기초자료로 사용될 수 있다.

• 대한수학교육학회지:학교수학
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• 제9권1호
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• pp.45-64
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• 2007

본 연구는 초등학교 6학년 학생들의 그래프 이해 능력을 알아보기 위해, 자료 읽기, 자료 사이의 관계 찾기, 자료 해석하기, 상황 이해하기의 4가지 과제 유형을 설정하고 초등학교에서 학습하는 6가지의 그래프를 대상으로 검사 문항을 구성하였다. 이를 이용하여 서울 시내 초등학교 6학년 학생 187명을 대상으로 검사를 실시한 후, 과제유형별 반응과 그래프 종류별 반응을 분석하였다. 분석 결과 그래프를 보고 자료 읽기와 자료 사이의 관계 찾기 과제에서는 높은 이해도를 보였으나 자료 해석하기와 상황 이해하기에서는 상대적으로 낮은 이해도를 나타냈다. 또한 같은 수준의 과제 내에서도 그래프의 종류에 따라 상당히 다른 이해도를 보였다. 이를 통해 그래프 교수 학습 방향에 대한 시사점을 도출하였다.

• 대한의용생체공학회:의공학회지
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• 제43권6호
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• pp.375-381
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• 2022

Brain-computer interface (BCI) is a technology that allows users with motor disturbance to control machines by brainwaves without a physical controller. Motor imagery (MI)-BCI is one of the popular BCI techniques, but it needs a long calibration time for users to perform a mental task that causes high fatigue to the users. MI is reported as showing a similar neural mechanism as motor execution (ME) and motor observation (MO). However, integrative investigations of these three tasks are rarely conducted. In this study, we propose a new paradigm that incorporates three tasks (MI, ME, and MO) and conducted a comparative analysis. For this study, we collected Electroencephalograms (EEG) of motor imagery/execution/observation from 28 healthy subjects and investigated alpha event-related (de)synchronization (ERD/ERS) and classification accuracy (left vs. right motor tasks). As result, we observed ERD and ERS in MI, MO and ME although the timing is different across tasks. In addition, the MI showed strong ERD on the contralateral hemisphere, while the MO showed strong ERD on the ipsilateral side. In the classification analysis using a Riemannian geometry-based classifier, we obtained classification accuracies as MO (66.34%), MI (60.06%) and ME (58.57%). We conclude that there are similarities and differences in fundamental neural mechanisms across the three motor tasks and that these results could be used to advance the current MI-BCI further by incorporating data from ME and MO.