• 대한기계학회논문집A
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• 제31권3호
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• pp.344-354
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• 2007

The objective of this study is to investigate the effect of arbitrarily located defect around the circular hole in the aircraft structural material such as Al/GFRP laminates and monolithic Al alloy sheet under cyclic bending moment. The fatigue behavior of these materials may be different due to the defect location. Material flaws in the from of pre-existing defects can severely affect the fatigue crack initiation and propagation behavior. The aim of this study is to evaluate effects of relative location of defects around the circular hole in monolithic Al alloy and Al/GFRP laminates under cyclic bending moment. The fatigue behavior i.e., the stress concentration factor($K_t$), the crack initiation life($N_i$), the relationship between crack length(a) and cycles(N), the relationship between crack growth rate(da/dN) and stress intensity factor range(${\Dalta}K$) near a circular hole are considered. Especially, the defects location at ${\theta}_1=0^{\circ}\;and\;{\theta}_2=30^{\circ}$ was strongly effective in stress concentration factor($K_t$) and crack initiation life($N_i$). The test results indicated the features of different fatigue crack propagation behavior and the different growing delamination shape according to each location of defect around the circular hole in Al/GFRP laminates.

• 한국정보시스템학회지:정보시스템연구
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• 제30권4호
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• pp.303-327
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• 2021

Purpose The online comments on news content have become social information and are understood based on deliberative democracy. Although the related research has focused on the relationship between online comments and their deliberative quality, the social information provided by online comments consists of not only direct information such as comments themselves but also indirect information such as 'likes' and 'dislikes'. Therefore, the research on online comments and deliberative quality should study this direct and indirect information together, and the direction and the degree of the indirect information should be also considered with them. Design/methodology/approach This study distinguishes comments by the attached 'likes' and 'dislikes', identifies highly supported and highly unsupported comments by the intensity of 'likes' and 'dislikes', and investigates the relationship between their existence and the deliberative quality measured as the topic diversity. Then, we applied topic modeling to the 2,390 news articles and their 74,385 comments collected from five news sites. Findings The topic diversities of the supported and unsupported comments are related to the topic diversity of all comments but the degree of the relationship is higher in the case of supported comments. Furthermore, the existence of highly supported and unsupported comments is led to less diversity of all comments compared to the case where those comments are absent. Particularly, when only highly supported comments are present, topic diversity was lower than in the opposite case.

• 대한한방부인과학회지
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• 제22권1호
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• pp.140-147
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• 2009

Purpose: This study was conducted to investigate the relationship between primary dysmenorrhea. Methods: Intensity of dysmenorrhea was evaluated by scoring system of Andersch and Milsom. Anger state, trait, expression of the patients suffering from dysmenorrhea was measured by STAXI-K. And each value was analyzed by ANOVA testm as to intensity of dysmenorrhea, student t test as to existence of dysmenorrhea. Results: The numerical value of anger expression in the primary dysmenorrhea existent group was significantly higher than that in the primary dysmenorrhea non-existent group. There were significant differences among the numerical value of anger expression in the groups classified as intensity of primary dysmenorrhea, the value of three positive group() was significantly higher than that of negative group(-). Conclusion: This study showed the relationship between anger expression and primary dysmenorrhea. But there was no clue to find out their causal relationship, because this study was cross-sectional. So further study will be needed to prove the causality between them. And more precise scale has to been developed to evaluate various type of anger accurately.

• 디지털융복합연구
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• 제21권1호
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• pp.29-34
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• 2023

본 연구의 목적은 국민건강영양조사(2021년)에서 만 6-29세 그룹이 스포츠음료 및 에너지음료 섭취빈도와 유산소 신체활동 간의 관련성을 알아보고자 하였다. 대상자의 사회인구학적 특성, 유산소 신체활동, 음료 섭취 정도는 복합 표본 기술통계로 산출하고, 집단 간 평균 차이는 교차분석, χ²-test, 이분형 로지스틱 회귀분석을 시행하였다. 고강도 유산소 활동이 스포츠음료(이온음료, 비타민음료)와 에너지음료(고카페인 음료) 섭취 빈도가 증가함으로 분석되었다(p<0.05). 중강도 유산소 신체활동에 비해 고강도 유산소 신체활동이 음료의 섭취 빈도 증가에 영향을 주는 요인으로 분석되었다. 본 연구를 바탕으로 신체활동과 음료 섭취 사이의 중요한 요소를 확인하고, 건강증진을 위한 중재 프로그램을 개발하는 데 목적을 두고 있다. 이를 통해 건강한 삶을 살 수 있도록 돕는 기초자료를 마련하고, 개인 및 사회적 관심을 높이고자 하였다.

• 한국의류학회지
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• 제23권1호
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• pp.170-181
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• 1999

The aim of this paper was to look at the distribution intensity for the women's formal wear industry. Most of the previous works on the distribution design have stressed product characteristics and consumer's shopping behaviours. The firm especially in women's aopparel industry recently has had difficulty in how to decide and to select the distribution numbers in the domestic market. Thus five hypothesis were set based on the data in '98Korea Fashion Guide describing the brand of women's wear in detail. It has been published by Korea Fashion Association in 1997. The variables of this study were the price the total sale the launching period the target customer's age and brand origins related with domestic or foreign. 579 brands had been analyzed with percentage anova duncan's test pearson's correlation and t-test. the results were as follows: In general the higher the price of the product is the less intensive the distribution of the women's apparel industry is. The higher the total sale is and the younger the target customer's age is the more intensive the distribution of the women's apparel industry is Besides there is difference between the domestic brand and the foreign brand in the distribution intensity. There is no relationship between the launching period of the brand and the distribution intensity. In addition four brand types were classified into the national brand the designer brand the licensed brand and the imported brand. Satatistically variables have shown different relations in terms of each brand type.

• 한국물환경학회지
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• 제31권4호
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• pp.407-417
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• 2015

Soil loss is one of the significant disasters which have threatened human community and ecosystem. Particularly, Korea has high vulnerability of soil loss because rainfall is concentrated during summer and mountainous regions take more than 70% of total land resources. Accordingly, the sediment control management plan are required to prevent the loss of soil resources and to improve water quality in the receiving waterbodies. In this regard, the objectives of this study are 1) to quantify the effect of the Vegetative Filter Strip (VFS) on sediment runoff reduction and 2) to analyze the relationship of rainfall intensity and sediment runoff. For this, SATEEC and VFSMOD were used to estimate sediment runoff according to rainfall intensity and to quantify the effect of VFS on sediment runoff reduction, respectively. In this study, the VFS has higher impact on sediment reduction for lower maximum rainfall intensity, which means that the maximum rainfall intensity is one of significant factors to control sediment runoff. Also, the sediment with VFS considered was highly correlated with maximum rainfall intensity. For these results, this study will contribute to extend the applicability of VFS in establishing eco-friendly sediment control plans.

• 말소리와 음성과학
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• 제2권4호
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• pp.19-28
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• 2010

The purpose of this study was to increase the current understanding of the acoustic characteristics of voices with advancing age. The relationship between age-related changes in body physiology and certain acoustic characteristics of voice was studied in a sample of 80 men representing four chronological age groupings (20-29, 50-59, 60-69, 70-79) who were all of good physical condition. Each subject was asked to phonate the vowel /a/, /i/, and /u/ for as long as possible at comfortable frequency and intensity level and read the sentence. A promising voice analysis program (Multi-Dimensional Voice $Program^{TM}$) was used to measure the fundamental frequency ($f_0$), jitter, shimmer, $f_0$ variation, peak-amplitude variation, smoothed pitch perturbation quotient, smoothed amplitude perturbation quotient, soft phonation index, $f_0$-tremor intensity index, amplitude tremor intensity index, and noise-to-harmonics ratio from the samples.

• Physical Therapy Rehabilitation Science
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• 제10권1호
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• pp.64-68
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• 2021

Objective: In clinical practice, there are a lot of exercise to reduce body weight or reduce the amount of body fat in order to solve back pain. However, many studies have contradicted the relationship between back pain and weight or body fat mass. The purpose of this study was to investigate the relationship between fat mass, body mass index and low back pain of office worker. Design: Crossed-sectional study Methods: Among the white-collar workers diagnosed with non-specific back pain by doctors, subjects who were not included in the exclusion criteria were selected to measure the subject's body fat mass, body mass index, pain intensity, and disability index due to back pain. The NPRS was used for the intensity of back pain of office workers, and the ODI was used for the degree of disability due to back pain. A body composition analyzer was used to measure the body fat mass and body mass index of white-collar workers. Results: There was no significant difference between the two groups in the comparison between the normal group and the excessive group according to the criteria of fat mass and body mass index. In the correlation analysis of fat mass, body mass index, pain intensity, and disability index, it was found that there was a significant correlation between fat mass and body mass index. However, neither fat mass nor body mass index had a significant correlation with pain intensity and disability index. Conclusions: The fat mass and body mass index of office worker do not affect low back pain.

• 대한기계학회논문집B
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• 제33권5호
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• pp.365-372
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• 2009

The influence of combustor pressure on the local reaction characteristics of $CH_4$/air flames was investigated by measurements of local chemiluminescence intensity. Induced flow flames are often applied to the industrial boiler systems and incinerator in order to improve heat transfer and prevent exhaust gas leakage. In order to investigate combustion characteristics in the induced flow pattern, the combustor pressure index($P^*$) was controlled in the range of $0.7{\sim}1.3$ for each equivalence ratio in the present combustion system, where $P^*$ is defined as the ratio of absolute pressure to atmospheric one. Relationship between local reaction intensity and pressure index have been investigated by simultaneous $CH^*$, $C^*_2$ and $OH^*$ intensity measurements. It could be observed that flame length became longer with decreasing $P^*$ from $CH^*$ chemiluminescence intensity of axial direction. The mean value of $C^*_2$ and $CH^*$ chemiluminescence intensities, which indicates reaction intensity in the $CH_4$/air flames, decreased with decreasing pressure index for ${\Phi}{\leq}1$, but increased with decreasing pressure index for ${\Phi}$>1. $C^*_2/CH^*$ intensity ratio, which can be a good marker to demonstrate local equivalence ratio, was almost same for ${\Phi}{\leq}1$ regardless of pressure index change, while they showed high level for lower pressure index for ${\Phi}$>1 conditions.

• Journal of Korean Neurosurgical Society
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• 제29권3호
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• pp.324-329
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• 2000

Objective : Psychological factors may have a major influence on the outcome of treatment for back pain. We investigated the relationship between the outcome and some psychological factors, such as self-reported pain intensity, disability, sleep disturbance and fatigue. Method : The study was conducted as a survey using a questionnaire and telephone interviews. The survey included consecutive 294 patients who visited the neurosurgical out-patient department complaining of low back pain and contacted by telephone on average seven months after the first visit. Pain intensity was measured by visual analog scale, and disability was assessed by Waddell's chronic disability index. Results : The outcome of treatment for back pain was recovered in 36.7%, improved in 30.6%, almost same in 28.6%, and aggravated in 4.1%. Overall rate of improvement was 67.3%. The rate of improvement was related to the duration, patterns and intensity of the symptom, and Waddell index. It was not influenced by the doctors, special studies, and methods of treatment. When the duration was more than 6 months, there were the symptoms of both back and legs, and the self-reported Waddell index was 1-3, the rate of improvement was relatively low. Although the intensity of the pain and disability was closely related to the degree of sleep disturbance, fatigue, appetite, or indigestion, the outcome of treatment for back pain was not always bad in patients with high psychological stress. Actually the outcome of the patients who complained severe pain and disability was better than the outcome of the others. Conclusion : The outcome of the back pain can be predicted by the duration, patterns and intensity of the symptom, and Waddell index. The multidisciplinary treatment will be necessary for the patients whose expected outcome is not good to reduce not only the physical symptoms but also the psychological stress.