• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.4
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• pp.1665-1671
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• 2012

The purpose of this study was to look into changes in voice using acoustic analysis during the process of neuromuscular electrical stimulation targeting dysphagia treatment. Fifteen man with dysphagia caused by stroke was treated neuromuscular electrical stimulation for two months and intensity of voice, $F_0$, Jitter, Shimmer, NNE were measured. The results of this study that improvement in functions of dysphagia and Jitter, Shimmer were stabilized. But there was not significantly changes of $F_0$. NNE was improved after the intervention, but still showed abnormal levels. This result suggests a possibility of effects that Neuromuscular electrical stimulation has on stabilization of Jitter, Shimmer and intensity of voice.

• Journal of Biomedical Engineering Research
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• v.25 no.2
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• pp.145-150
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• 2004

In this study for the prosthesis of the spatial and directional sensation for the blind, an ultrasonic scale system and an electronic compass system were developed. The ultrasonic scale utilizes 40 ㎑ sound for the detection of distance to the barrier and the spatial information is transferred to the blind by various sound interval, which is proportional to the distance. The electronic compass utilizes a magnetoresistor bridge for the detection of the magnetic field strength of earth in horizontal plane. The information for the direction of the earth's north is transferred by tactile stimuli by a vibrating motor band around upper head. Detection distance of the ultrasonic scale is ranged from 0.065 to 3.26 meters, and the detection angle resolution of the electronic compass is about 22.5 degrees. The integrated system of the ultrasonic scale and the electronic compass was developed. Distance information is converted to the location of the tactile stimulation along the clockwise direction by a vibrating motor according to the distance installed around upper head of the blind. The intent of this article is to provide an practical prosthetic tool of spatial and directional sensation for the blind. Daily practice of this system will improve the usefulness of this system.

• Journal of Digital Convergence
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• v.16 no.7
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• pp.345-355
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• 2018

The purpose of this study was to investigate the convergence factors affecting of physical activity level on hemodialysis patients' depression, health-related quality of life and sleep disorders. The participants were 193 hemodialysis patients undergoing hemodialysis in five hospitals in two cities. Data were analyzed by technical statistics, correlation and hierarchical regression. The results showed that depression and physical activity were negatively correlated (r = -.259, p <.01), and physical and mental health related quality of life and physical activity correlated positively (R = .273, p <.01, r = .186, p <.01), respectively. Hierarchical regression analysis showed that the higher the quality of life related to physical health, the higher the level of physical activity of hemodialysis patients (${\beta}=.22$, p <.01). Therefore, it is required to develop an intervention program to improve health-related quality of life by improving the physical activity of hemodialysis patients.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.8 no.2
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• pp.273-286
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• 1997

Objective：This study was designed to evaluate effects of methylphenidate(MPH) on event-related potentials(ERP) and continuous performance test(CPT) in attention-deficit hyperactivity disorder (ADHD) and to see the correlation between changes in ERP and changes in performance. Method：ERP and CPT were used to examine the acute effects of MPH(0.5mg/kg) in eleven ADHD boys(89-103 months old). Results：1) After MPH administration, P3 latency to nontarget stimuli at Fz was significantly decreased (p<0.01) and P2 amplitudes to target stimuli at Pz and at Oz and P3 amplitude to target stimuli at Cz were significantly increased(p<0.05). 2) Commission error and omission error in the CPT-X and commission error in the CPT-AX were decreased(p<0.01), and hits and perceptual sensitivity(d') in the CPT-X and d′ in the CPT-AX were increased(p<0.01). 3) The change of P3 latency to nontarget stimuli at Fz and the change of d′ in the CPT-X were negatively correlated(p<0.05), and the change of P2 amplitude to target stimuli at Pz and d′ in the CPT-AX were positively correlated(p<0.05). Conclusion：MPH improves change orienting reaction, the delivery of task relevant information, accuracy and perceptual sensitivity in ADHD. And the increase of ability to discriminate targets from non-targets reflects reduced evaluation time in large memory component task and enhanced change orienting reaction in simple task.

• Journal of dental hygiene science
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• v.15 no.3
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• pp.355-360
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• 2015

The purpose of this study was to examine the relationship between the oral health behavior and self-efficacy of adolescents. The subjects in this study were 300 selected students in a girls' high school located in the city of Iksan. A survey was conducted from November 2 to 5, 2014, with questionnaires that covered oral health behavior and self-efficacy, and the answer sheets from 298 respondents were analyzed by a statistical package IBM SPSS Statistics ver. 21.0. The group that got regular dental checkups (3.26) excelled the other group that didn't in self-efficacy (p<0.05), and the group who made use of oral care products and who brushed their teeth four times or more had a better self-efficacy than the other group that didn't. The students who considered themselves to be in better oral health scored higher in self-efficacy, and the groups who had no difficulties in pronunciation (3.66) and mastication (3.32) scored higher (p<0.01, <0.001). Masticatory dysfunction (r=-0.184) and pronunciation disorder (r=-0.200) were negatively correlated with self-efficacy, but oral health status (r=0.243) had a positive correlation with it. Self-efficacy was better when oral health status was better (p<0.001) and when there was no pronunciation disorder (p<0.01). The above-mentioned findings suggested that there was a close relationship between oral health behavior and self-efficacy. Therefore the kind of program that aims at changing youth oral health awareness and oral health behavior should be prepared to improve the self-efficacy of adolescents.

• 한국노년학
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• v.25 no.2
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• pp.143-154
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• 2005

This study was conducted to examine the environmental status, FIM(Function Independence Measure), Illness intrusiveness of home stayed stroke patients. Data were collected on 145 patients living in K city and the neighborhood located in southern part of Korea. The data were analyzed by means of SPSS program. Results : In assessment of environmental safety, 46.2%(67) felt unsafe around their residential area. The most dangerous facilities in their residence was stairs(58.2%), gas/electric facilities(14.9%). For sanitary problems, 28.2%(41) felt they have problems at their home. The most important problems were outdoor polluted toilet(22.0%) and scattered and dirty residential circumstances(22.0%). The average FIM score was 74.52(4.14) of total score 126(7). In motor area FIM was lowest at stair walking(3.01) and bathing(3.16). In cognitive area FIM was lowest at social activities(3.36). The mean score of Illness intrusiveness was 58.86(4.52) of total score 91(7). The major area largely impacted by stroke were health(5.61), working(5.68), active leisure activities(5.56). There was significant reverse correlation between FIM and illness intrusiveness(r=-0.66, p=0.00). Conclusion : It was needed environmental improvement and rehabilitation program for stroke patients, and repeated follow up study.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1999.11b
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• pp.197-200
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• 1999

MPEG-4 오디오 부호기의 일부인 HVXC(Harmonic and Vector excitation Coding) 부호기는 음성의 무성음 구간에서는 CELP 코덱, 유성음 구간에서는 MBE 코덱을 이용하여 부호화하는 구조로서, 많은 연산량을 필요로 하여 범용DSP를 이용한 실시간 구현의 장애요소로 작용한다. 본 논문에서는 TMS320C6701 DSP를 이용하여 많은 연산 시간을 요하는 함수들에 대한 C언어 및 어셈블리 레벨의 최적화를 수행하여 HVXC 함수들의 실행시간을 단축하고 이를 라이브러리화 하여 실시간 구현에 이용가능 하도록 하였다.

• Journal of Oral Medicine and Pain
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• v.14 no.1
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• pp.9-17
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• 1989

The author has measured the duration of occlusal sounds during centric occlusal tapping in 30 patients with TMD and 30 normal subjects as controls, and then correlated the duration of occlusal sounds with CMI, amount of centric slide, midline deviation, habitual side of mastication, and presence of occlusal interference. The results were as follows 1. The duration of occlusal sounds during centric occlusal tapping were 36.26 msec in TMD patients and 22.8 msec in normal subjects (p<0.01). 2. The correlation between duration of occlusal sounds and CMI was significant (p<0.01). 3. The correlations between duration of occlusal sounds with amount of centric slide, midline deviation, habitual side of mastication, and presence of occlusal interference were not significant (p<0.05).

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.506-512
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• 2006

시각적인 정보전달이 어려운 상황에서의 대상인식, 혹은 시각장애인의 대상인식에 있어서 소리는 어느 정도의 역할을 할 수 있을까? 이 연구는 소리를 통해 대상의 형태정보를 전달하기 위해 진행되었다. 하나의 음(musical tone)을 음높이와 음색, 지속시간을 조정한 후, 머리전달함수(Head-Related Transfer Function: HRTF)를 이용하여 수평선, 수직선, 대각선, 곡선의 형태로 운동하는 3-D 사운드 형태소로 만들었다. 그리고 이들의 연속적인 조합을 통해 단순한 도형에서부터 복잡한 도형, 이들 2차원상의 도형을 단면으로 하는 3차원상의 도형들까지 그려내는 소리자극을 구성하였다. 성인 대학생을 대상으로 한 실험에서, 이렇게 만들어진 청각이미지(auditory image)를 듣고 표상된 형태를 여러 개의 시각적인 이미지들(visual images) 중에서 선택하는 과제를 실시하였는데, 실험 결과는 평균 78%의 정확율을 보였다. 이는 소리를 이용한 형태정보 전달의 가능성이 있음을 시사하는 것이며, 이러한 시도는 청각 인터페이스의 응용범위를 확장하는데 도움이 될 것이다.

• Journal of Oral Medicine and Pain
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• v.19 no.2
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• pp.125-135
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• 1994

저자는 두 개하악장애환자의 보존적 치료에 따른 압력통각역치오 휴식시 근전도의 변화를 평가하기 위하여 여성 환자 21명을 대상으로 치료전후에 각각 동통의 정도를 유추척도로 나타내었고 편이개구량을 측정하였으며 교근과 전측두근의 압력통각역치와 휴식시 근전도를 조사하였다. 두 개하악장애의 병력이나 증상이 없는 21명의 정상 여학생을 대조군으로 교근과 전측두근의 압력통각역치와 휴식시 근전도를 측정하여 환자군과 비교한 결과 다음과 같은 결론을 얻었다. 1. 보존적 치교이후 동통과 최대편이개구량은 개선되었다. 2. 보존적 치료이후 압력통각역치는 증가하였고 휴식시 근전도는 감소하였다. 3. 압력통각역치나 휴식시 근전도의 좌우차이는 없었다. 4. 압력통각역치와 휴식시 근전도사이에는 약한 음의 상관관계가 있었다.