• 대한물리의학회지
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• 제18권4호
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• pp.155-162
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• 2023

PURPOSE: The primary objective of this study was to develop a virtual reality-based vestibular rehabilitation system to enhance balance perception, target rehabilitation specialists, and evaluate its usability. A key goal was establishing a system refinement strategy based on the collected data. METHODS: We conducted a study involving ten adults aged 10 to 29 in Gwangju Metropolitan City to evaluate the usability of a virtual reality-based vestibular rehabilitation system to enhance balance perception. After introducing the product and explaining its use to the participants, balance assessments and training were conducted using computerized dynamic posturography (CDP) (also called the test of balance [TOB]). Subsequently, participants were given a questionnaire to evaluate subjective stability, operability, and satisfaction. Frequency analysis was utilized to determine the frequency of the variable values of the measurement items in the survey for descriptive statistics. RESULTS: We found that the average usability score was 2.587. When broken down by category, stability received an average rating of 2.725, operability scored an average of 2.783, and satisfaction averaged 2.454. These findings suggest that most participants experienced positive sentiments and considerable satisfaction. CONCLUSION: The study successfully developed a virtual reality-based vestibular rehabilitation system, which was an improvement over the previous model and addressed its shortcomings. The results show that users with vestibular impairments are satisfied and more engaged with this system, indicating that additional studies are warranted.

• 한국자동차공학회논문집
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• 제15권6호
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• pp.108-113
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• 2007

This study aims to find equivalent comfort contours, reciprocal of frequency weighting curves, for vertical steering wheel vibration. Psychophysical responses were measured from twelve male subjects by using magnitude estimation of relative discomfort due to vertical steering wheel vibrations of magnitude of 0.1 to 1.58 $m/s^2$ in the frequency range of 4 to 250 Hz. Relative discomfort were estimated with a reference vibration of 0.4 $m/s^2$ at 31.5 Hz. Equivalent comfort contours were produced from the median of sensation magnitudes judged by twelve subjects, which showed variation in the shapes with increase of vibration magnitude. A shape of the contour came close to the perception threshold curve with decrease of vibration magnitude. When the vibration magnitude increases, the shape changed close to those in the references of Hong and et al (2003). It is also recommended frequency weighting curves for vertical steering wheel vibration must be expressed as a function of vibration magnitude as well as frequency.

• 한국멀티미디어학회논문지
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• 제19권5호
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• pp.837-847
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• 2016

Tone mapping for High Dynamic Range(HDR) image provides matching human visual perception between real world scene and displayable devices. Recently, a tone mapping algorithm based on localized gamma correction is proposed. This algorithm is using human visual properties of contrast and colorfulness with background intensity, generating a weight map for gamma correction. However, this method have limitations of controlling enhancement region as well as generating halo artifacts caused by the weight map construction. To overcome aforementioned limitations, proposed algorithm in this paper modifies previous weight map, considering base layer intensity of input luminance channel. By determining enhancement region locally and globally based on base layer intensity, gamma values are corrected accordingly. Therefore, proposed algorithm selectively enhances local brightness and controls strength of edges. Subjective evaluation using z-score shows that our proposed algorithm outperforms the conventional methods.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.655-658
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• 2009

Fractal dimension has been used for texture analysis as it is highly correlated with human perception of surface roughness and applied to quantifying the structures of wide range of objects in biology and medicine. On the other hand, the evaluation of the human skin state is based solely on the subjective assessment of clinicians; this assessment may vary from moment to moment and from rater to rater. Therefore we attempt to analysis of skin texture image using fractal dimension and discuss its application to evaluating human skin state. It can be helpful for extracting human features and also can be useful for detection of many human skin diseases. This paper presents a method to calculate fractal dimension of skin with use of camera lens magnification. We take multiple pictures frequently from skin with different camera lens magnification as a magnification factor of fractal set, and counting the number of objects (cells) in each picture as a number of self similar pieces of fractal set.

• 한국소음진동공학회논문집
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• 제16권10호
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• pp.1005-1013
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• 2006

A survey and auditory experiment on multiple residential noises such as floor impact, airborne, bathroom, drainage and traffic noises were conducted to develop a combined rating system and to establish criteria for multiple residential noises. Subjective reactions such as annoyance, activity disturbance, sleep disturbance, and satisfaction to overall noise environment and each residential noise were recorded. The effect of individual noise perception on the evaluation of the overall noise environment was also investigated. The survey results showed that satisfaction for floor impact noise most greatly affects the overall satisfaction for overall noise environment and annoyance most greatly affects the satisfaction for individual noise sources. Auditory experiments were undertaken to determine the percent satisfaction for individual noise levels. Result of auditory experiment showed that the noise level corresponding to 40 % satisfaction is 49 dB $(L_{i,Fmax,AW})$ for floor impact and is about 40 dB(A) for airborne, drainage and traffic noise. From the results of the survey and the auditory experiments, an equation for predicting the overall satisfaction for multiple noises was developed and a classification of multiple residential noises was proposed.

• 한국응용과학기술학회지
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• 제36권1호
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• pp.113-124
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• 2019

The purpose of the study was to investigate the effects of sea cucumber extract on skin as a natural cosmetics functional material. Subjective evaluation of cosmetics before and after were conducted with questionnaires regarding moisture content, sebum content, melanin index, and erythema index. Experiments were conducted on improvement efficacy using skin clinical trials and questionnaires to evaluate changes in perception of skin condition and efficiency of products. With the aim of minimizing skin irritation, the efficiency of the solvent used for extraction was an important factor, and the sea cucumber extract was harvested with efficient extraction conditions at a ratio of 1:10 of 50% ethanol. The study aimed to identify the suitability of sea cucumber extract as a functional cosmetics material to improve the moisturizing ability of skin and its effect on the skin by adding marine natural animal sea cucumber extract. Clinical studies on cosmetics skin containing sea cucumber extract, excellent skin improvement effect from all items of clinical experiment in experimental and control groups. Sea cucumber extract was proved to be a stable, non-adverse physiologically active substance against abnormal symptoms or side effects of skin reactions and skin problems. In addition, the study found excellent results that can lead to its use as a cosmetics material. This is expected to contribute to the development of various cosmetics industries.

• 한국의류학회지
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• 제45권1호
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• pp.180-199
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• 2021

This study investigated natural aroma fragrance on the fashion image of Galchon, a traditional natural dyeing textile made with immature persimmon from the Jeju area, Korea. Nine fabric pairs consisting of differently colored cotton and silk Galchon with various tones and fabric types were used for subjective evaluation. Thirty five female college students evaluated the specimens using a 7-point scale questionnaire for fashion image-related adjectives. A specimen with three different presentation types that included fabric without fragrance (FO), fabric with citrus fragrance, and fabric with chamaecyparis (FCP) were randomly provided to a subject. As a result, color variables of Galchon were found to be the primary influence on fashion images for both cotton and silk Galchon that showed interaction effects with presentation types. The citrus fragrance increased the feeling of 'Active' while chamaecyparis tended to contribute to a stronger perception of 'Elegance' for cotton Galchon. Finally, these results were used to develop prediction models for fashion images of Galchon that employed color variables and presentation types.

• 한국산학기술학회논문지
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• 제16권5호
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• pp.3353-3360
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• 2015

본 연구는 현역병을 대상으로 BMI 현황과 같은 연령대의 남성에 비해 BMI가 어떤 차이가 있는지 및 현역병의 BMI 변화에 영향을 미치는 요인이 무엇인지 확인하고자 하였다. 연구방법으로는 4개 부대에서 복무 중인 현역병을 대상으로 2009년 2월 23일부터 3월 31일까지 자기기입식 설문을 실시하였다. 통계분석에는 총 301명을 대상으로 독립표본 T-검정, 교차분석 및 다중선형회귀분석이 사용되었다. 연구결과, 현역병의 과체중 비율은 18.6%로 같은 연령대 남성의 22.1%에 비해 낮아 또래 남성에 비해 현역병의 비만율이 낮은 것으로 확인되었다. 건강행태에서는 정상체중 이하 군(2.39)이 과체중군(2.13)보다 식습관 점수가 높아 정상군이 상대적으로 천천히 먹고, 맵고 단것을 덜 먹는 것으로 확인되었다. 과체중군(2.25)이 정상체중 이하 군(2.98)에 비해 자신의 체형에 대한 만족도가 낮은 반면 체중조절활동은 과체중군(4.01)이 정상체중 이하 군(3.37)보다 점수가 유의하게 더 높게 나타났다. BMI 변화에 대한 영향요인으로는 식습관, 주관적 체형인식, 체중조절활동이 확인되었다. 따라서 현역병의 BMI를 향상시키기 위해서는 개인적 노력보다는 단체 급식과 군 내 매점 운영을 개선하여 조직차원에서 비만에 영향을 주는 요인에 접촉하지 못하도록 하는 중재노력 및 올바른 체형인식에 대한 교육, 체중조절활동에 대한 독려가 필요할 것으로 사료된다.

• 한국산학기술학회논문지
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• 제11권6호
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• pp.1961-1968
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• 2010

2003년 Betts는 효율적인 투사검사 기법의 일환으로 FSA(얼굴자극검사: Face Stimulus Assessment)를 개발하였다. 이 논문에서는 Betts가 제안한 FSA 척도들을 색칠의 정확도, 색상의 적합도, 형상의 인식도, 묘사의 정밀도, 공간의 활용도의 다섯 가지로 분류하고 이를 객관적으로 평가하는 컴퓨터 알고리즘을 개발한다. 본 알고리즘은 눈, 입 술, 머리카락 등의 FSA 평가에 주요한 요인의 영역을 설정하고, 대표색 및 색의 비율을 통해 각 척도들의 등급을 산출한다. 그리고 이차 가중 Kappa 값을 통해 미술치료 전문가의 평가와 컴퓨터 알고리즘의 평가 간의 일관성을 보이고, 이를 통해 본 알고리즘의 적합성을 검증한다. 이 논문은 FSA를 평가함에 있어 미술치료사의 주관이나 경험 또는 직관에 따른 불확실성을 극복하고 객관성과 일관성을 제공하여 그림을 통한 투사검사의 신뢰성을 높일 수 있을 것으로 기대된다.

• 말소리와 음성과학
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• 제13권4호
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• pp.67-74
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• 2021

본 연구는 영유아 교육시설에서 근무하는 음성의 불편감을 호소하는 10명의 여성 교사들을 대상으로 반폐쇄성도훈련(semi-occluded vocal tract exercise, SOVTE)을 원격으로 실시하였을 때 주관적으로 평가하는 음성평가에 미치는 효과를 살펴보았다. 원격 SOVTE의 효과는 한국어판 음성장애지수(Korean voice handicap index, KVHI), 음성 활동 및 참여 프로파일-한국판(Korean version of the voice activity and participation profile, K-VAPP), 음성노력도 및 GRBAS를 이용한 청지각적 평가로 평가하였다. 연구 결과, KVHI의 총 점수, 기능적 점수, 신체적 점수는 원격 SOVTE를 실시한 후에 통계적으로 유의하게 낮아졌다. 원격 SOVTE 실시 후 K-VAPP의 총 점수도 유의하게 감소하였으며, 음성노력도 또한 유의하게 감소하였다. 그러나 GRB 척도는 원격 SOVTE 실시 전과 후 간에 통계적으로 유의한 차이를 보이지 않았다. 본 연구를 통해 영유아 여성 교사에게 원격으로 실시한 SOVTE는 음성의 불편감을 감소시키는데 효과적임을 입증하였으며, 원격으로 실시한 음성치료가 효과가 있음을 보여준다.