• Smart Structures and Systems
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• 제1권2호
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• pp.141-158
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• 2005

A new design of distributed crack sensors based on the topological change of transmission line cables is presented for the condition assessment of reinforced concrete (RC) structures during and immediately after an earthquake event. This study is primarily focused on the performance of cable sensors under dynamic loading, particularly a feature that allows for some "memory" of the crack history of an RC member. This feature enables the post-earthquake condition assessment of structural members such as RC columns, in which the earthquake-induced cracks are closed immediately after an earthquake event due to gravity loads, and are visually undetectable. Factors affecting the onset of the feature were investigated experimentally with small-scale RC beams under cyclic loading. Test results indicated that both crack width and the number of loading cycles were instrumental in the onset of the memory feature of cable sensors. Practical issues related to dynamic acquisition with the sensors are discussed. The sensors were proven to be fatigue resistant from shake table tests of RC columns. The sensors continued to show useful performance after the columns can no longer support additional loads.

• 여성건강간호학회지
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• 제23권4호
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• pp.221-232
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• 2017

Purpose: This study aimed to conduct a systematic review and to describe characteristics of the birth experience assessment instrument. Methods: Literature related to the development of the birth experience assessment instrument was examined using a systematic review method. A literature search was conducted using the keywords as '[normal birth]; [$satisfac^*$ OR care quality]; [instrument OR scale] AND (development)' through PubMed, CINAHL, SCOPUS, PsycINFO, and RISS. The search used quality appraisal through QUADAS (Quality Assessment of studies of Diagnostic Accuracy included Systemic reviews) yielding 17 records. Results: The birth experience assessment instrument was categorized for instrumental characteristics: birth satisfaction (n=8), perception of labor experience (n=5), and birth care quality assessment in normal and operative birth experiences (n=4). Important key elements for content characteristics were as follows: nursing practice (n=10), pain control (n=5), environment (n=5), participation (n=4), and support (n=4). Conclusion: This study demonstrated that the birth experience instrument is appropriate for measuring quality of birth care in various clinical conditions. This review of the birth experience instrument reports that an appropriate psychometric tool for enhancing quality of birth care is important.

• Applied Microscopy
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• 제37권2호
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• pp.111-121
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• 2007

Diffractogram 법을 이용하여 한국기초과학지원연구원에 설치된 초고전압 투과전자현미경(KBSI-HVEM)의 대물렌즈에 대한 구면수차 계수와 분해능을 측정하였다. 측정 정밀도 향상을 위해 획득한 diffractoram을 디지털 처리하였고 각 intensity 분포 그래프를 graphical curve fitting으로 정밀하게 분리하였다. 정밀 측정을 위한 실험적 고려 사항들을 고찰하였고 최적 실험 조건 도출을 위한 방안들을 본 실험을 통해 제안하였다. 실험적으로 측정된 대물렌즈의 구면수차 계수는 $2.628{\pm}0.04\;mm$였으며 이 값은 제조사에서 대물렌즈 설계 시 제안한 $C_s=2.61\;mm$와 거의 일치하는 값이었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.73-76
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• 2005

Carbon nanotubes (CNTs) have attracted an increasing attention due to their superior mechanical properties and potential application in industries. The strength of CNT has been predicted or calculated through several simulation techniques but actual experiments on stress-strain behavior are rare due to its dimensional limit, nanoscale positioning/manipulation, and instrumental resolution. We have attempted to observe straining responses of a multi-walled carbon nanotube (MWNT) by performing an in-situ tensile testing in a scanning electron microscope. The carbon nanotube, having its both ends attached on a cantilever force sensor and Y-shaped support, was elongated by a computer-controlled nanomanipulator. Linear deformation and fracture behaviors of MWNT were successfully observed and its force-displacement curve was also measured from the bending stiffness and displacement of the force sensor and manipulator.

• International Journal of Computer Science & Network Security
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• 제21권8호
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• pp.79-86
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• 2021

Alzheimer's is a chronic progressive disease which exhibits varied symptoms and behavioural traits from person to person. The deterioration in cognitive abilities is more noticeable through their Activities and Instrumental Activities of Daily Living rather than biological markers. This information discussed in social media communities was collected and features were extracted by using the proposed fuzzy logic based algorithm to address the uncertainties and imprecision in the data reported. The data thus obtained is used to train machine learning models in order to predict the longevity of the patients. Models built on features extracted using the proposed algorithm performs better than models trained on full set of features. Important findings are discussed and Support Vector Regressor with RBF kernel is identified as the best performing model in predicting the longevity of Alzheimer's patients. The results would prove to be of high value for healthcare practitioners and palliative care providers to design interventions that can alleviate the trauma faced by patients and caregivers due to chronic diseases.

• Journal of Audiology & Otology
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• 제24권3호
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• pp.140-148
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• 2020

Background and Objectives: The aim of this study is to evaluate the effect of music training on the characteristics of auditory perception of speech and music. The perception of speech and music stimuli was assessed across their respective stimulus continuum and the resultant plots were compared between musicians and non-musicians. Subjects and Methods: Thirty musicians with formal music training and twenty-seven non-musicians participated in the study (age: 20 to 30 years). They were assessed for identification of consonant-vowel syllables (/da/ to /ga/), vowels (/u/ to /a/), vocal music note (/ri/ to /ga/), and instrumental music note (/ri/ to /ga/) across their respective stimulus continuum. The continua contained 15 tokens with equal step size between any adjacent tokens. The resultant identification scores were plotted against each token and were analyzed for presence of categorical boundary. If the categorical boundary was found, the plots were analyzed by six parameters of categorical perception; for the point of 50% crossover, lower edge of categorical boundary, upper edge of categorical boundary, phoneme boundary width, slope, and intercepts. Results: Overall, the results showed that both speech and music are perceived differently in musicians and non-musicians. In musicians, both speech and music are categorically perceived, while in non-musicians, only speech is perceived categorically. Conclusions: The findings of the present study indicate that music is perceived categorically by musicians, even if the stimulus is devoid of vocal tract features. The findings support that the categorical perception is strongly influenced by training and results are discussed in light of notions of motor theory of speech perception.

• 대한청각학회지
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• 제24권3호
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• pp.140-148
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• 2020

Background and Objectives: The aim of this study is to evaluate the effect of music training on the characteristics of auditory perception of speech and music. The perception of speech and music stimuli was assessed across their respective stimulus continuum and the resultant plots were compared between musicians and non-musicians. Subjects and Methods: Thirty musicians with formal music training and twenty-seven non-musicians participated in the study (age: 20 to 30 years). They were assessed for identification of consonant-vowel syllables (/da/ to /ga/), vowels (/u/ to /a/), vocal music note (/ri/ to /ga/), and instrumental music note (/ri/ to /ga/) across their respective stimulus continuum. The continua contained 15 tokens with equal step size between any adjacent tokens. The resultant identification scores were plotted against each token and were analyzed for presence of categorical boundary. If the categorical boundary was found, the plots were analyzed by six parameters of categorical perception; for the point of 50% crossover, lower edge of categorical boundary, upper edge of categorical boundary, phoneme boundary width, slope, and intercepts. Results: Overall, the results showed that both speech and music are perceived differently in musicians and non-musicians. In musicians, both speech and music are categorically perceived, while in non-musicians, only speech is perceived categorically. Conclusions: The findings of the present study indicate that music is perceived categorically by musicians, even if the stimulus is devoid of vocal tract features. The findings support that the categorical perception is strongly influenced by training and results are discussed in light of notions of motor theory of speech perception.

• East Asian Economic Review
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• 제26권3호
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• pp.179-204
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• 2022

This study examines the extent to which policy-based loans to SME exporters affect their export performance (the intensive margin of exports). We also investigate the heterogeneous export effects of policy-based loans that may depend on firm- and industry-specific characteristics, such as credit ratings, debt-to-assets ratios, firm size and age. To do so, we conduct a survey, of 1,000 Korean SMEs, that collect information on firm-level exports and policy-based loans. The main empirical findings strongly support that SMEs that receive policy-based loans tend to increase their export volumes. However, these loans' positive impact on exports are only valid for SME exporters with credit scores of 12 or greater (that is, SMEs that have difficulty accessing the external financial market). The estimation results with respect to SMEs' dependence on external financing imply that policy-based loans for SMEs in sectors that are heavily dependent on external finance are effective in that they are instrumental in increasing these firms' exports. These empirical findings emphasize the importance of the external financial market to SME exporters who face various up-front investments that are related to their exporting activities.

• 농촌의학ㆍ지역보건
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• 제33권2호
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• pp.204-220
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• 2008

Objectives: This study was performed to determine the levels of depression symptoms among the community elderlies and to reveal its related factors, specifically aimed at revealing psycho-social factors such as social support net-work, sense of self-esteem, state anxiety, interpersonal behavior trait and locus of control. Methods: The interviews were performed during the period from April 1st to June 30th, 2007 to the 790 elderlies in urban and rural areas. Results: The mean scores of depression (CES-D) among all subjects were 16.65±10.97(urban: 18.81±10.31, rural: 14.49±11.20) and they were higher in urban than rural. The level of depression symptoms was influenced by the variables of educational level, with or without spouse, bear for living expenses, sense of satisfaction in daily life. As for health related behaviors, they were influenced by the variables of with or without regular exercise. As for health status, they were influenced by the subjective health status, with or without disability of body, visual acuity, hearing ability, ability of food mastication, urinary incontinence, with or without help in activity of daily living (ADL) and instrumental activity of daily living (IADL). As for social support net-work and social activities, they were influenced by number of offspring, frequency of offspring contents, frequency of going out and activity of hobbies. As for psycho-social factors, they were influenced by sense of self-esteem, state anxiety and social support, especially, the level of depression symptoms was higher influenced by the variables of psycho-social factors than other variables. Conclusions: Lower of the level of depression symptoms among the community elderlies would require development and application of programs to keep under management psycho-social factors as well as looking for ways to promoting the present health status.

• 한국노년학
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• 제41권2호
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• pp.253-270
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• 2021

본 연구는 세대 간 거주근접성이 성인자녀가 중고령부모에게 제공하는 경제적 자원이전과 어떠한 관련성이 있는지, 세대간 거주근접성과 경제적 자원이전의 관계가 자녀의 성별에 따라 차이가 나타나는지 살펴보았다. 자녀 본인 뿐 아니라 형제자매의 거주근접성 역시 고려되었다. 미국 등 국외 선행연구는 근거리에 거주하는 형제자매가 제공하는 도구적 지원을 보완하기 위해 원거리에 거주하는 자녀의 경제적 지원수준이 높을 것으로 보았다. 데이터는 한국고령화연구패널 5차(2014)자료를 활용하였으며 연구대상은 부모의 연령이 60세 이상이고 자녀의 연령은 35세에서 55세 사이로 부모가 자녀와 동거하는 경우 분석에서 제외되었다. 부모의 경우 부부가구이거나 배우자와 사별한 독거가구로 구분하였다. 고정효과모형과 확률효과모형으로 가족내 분석을 실시하였고 연구결과는 다음과 같다. 첫째, 부모와 30분 이내 거리에 거주하거나 혹은 1시간 이상 2시간 이내 거리에 거주하는 경우 아들의 경제적 지원액이 딸보다 많았다. 둘째, 선행연구 결과와 달리, 형제자매를 포함하여 모든 자녀가 부모와 1시간 이상 거리에 거주할 때 아들과 딸 성별의 구분 없이 경제적 지원액이 높았다. 세대간 거주근접성과 경제적 자원이전의 관련성은 배우자와 사별한 1인가구 부모가 경제적 지원의 수혜자인 경우 나타나지 않았다.