• Structural Engineering and Mechanics
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• v.59 no.1
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• pp.187-207
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• 2016

Practical ambient excitations of engineering structures usually do not comply with the stationary-white-noise assumption in traditional operational modal analysis methods due to heavy traffic, wind guests, and other disturbances. In order to eliminate spurious modes induced by non-white noise inputs, the improved stochastic subspace identification based on a delay index is proposed in this paper for a representative kind of stationary non-white noise ambient excitations, which have nonzero autocorrelation values near the vertical axis. It relaxes the stationary-white-noise assumption of inputs by avoiding corresponding unqualified elements in the Hankel matrix. Details of the improved stochastic subspace identification algorithms and determination of the delay index are discussed. Numerical simulations on a four-story frame and laboratory vibration experiments on a simply supported beam have demonstrated the accuracy and reliability of the proposed method in eliminating spurious modes under non-white noise ambient excitations.

• Journal of Korean Clinical Health Science
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• v.2 no.2
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• pp.79-89
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• 2014

Purpose. This study was conducted to provide basic data on the subjective happiness index and identify factors influencing college professor and staff by describing their perception of general characteristics, health behavior, suicidal ideation, and subjective happiness index. Methods. A survey was conducted with 198 professor and staff who were working University on K city. Data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficients and multiple regression with SPSS window 18.0 program. Result. The Mean scores of Subjective happiness in college professor and staff was 4.66 on a scale of 7. There were significant differences on the subjective happiness Index for the followings: age, breakfast for 2 day, blood pressure (Lt systolic), health status index (EQ-VAS). There was a negative correlation between the subjective happiness Index and suicidal ideation. Factors influencing of subjective happiness in college professor and staff were identified as age (${\beta}=.201$), breakfast for 2 day (${\beta}=-.180$), blood pressure (Lt systolic) (${\beta}=-.244$), health status index (EQ-VAS) (${\beta}=.408$). These factors explained 35.1% of variance in subjective happiness in college professor and staff. Conclusion. Results indicate that factors influencing subjective happiness are suggesting the need to establish policies of health behavior. health behavior program for a life of happiness among college professor and staff.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.20 no.1
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• pp.71-78
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• 1990

This research was made to investigate the change of the image layer and of the vertical and horizontal magnification on the Panelipse radiographic image by the control of profile index. Using the Panelipse, a series of 60 exposures were taken with the steel balls placed in the holes of the plastic model plate, and then evaluated by 4 observers. Two points were assigned for a reading of sharp, one for middling sharp, and zero for unsharp. Each ball image then could be given a total reader score of 0 to 8. The author analyzed the image layer as defined by a sharpness score of 6 or more. The results obtained were as follows: As the profile index was increased, the shape of the image layer was not changed, and the width of the image layer was increased, and the position of the layer shifted away from the rotation center. As the profile index was increased, the ranges of vertical and horizontal magnification was increased, especially the ranges of horizontal magnification was greater than that of vertical magnification.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.36 no.4
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• pp.83-92
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• 2020

The purpose of this study is to develop a publicness evaluation index for indoor privately owned public spaces (POPS). In order to develop the index, 10 cases of indoor POPS in New York City were analyzed using Visibility Graph Analysis by evaluating its accessibility and visual openness. The results are as follows; (1) Accessibility and openness of indoor POPS were higher compared to other public spaces on the first floor. (2) Cases with high accessibility index installed a higher number of entrances. (3) Cases with high openness index were mostly composed of a glass wall. (4) The publicness index was high when the lobby and the indoor POPS are shared. (5) Atrium types were highly utilized and the evaluation index was also high whereas, linear types were less utilized and the evaluation index was lower.

• Journal of the Korean Society of Physical Medicine
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• v.19 no.1
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• pp.43-51
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• 2024

PURPOSE: Sarcopenic obesity (SO) is a clinical condition that combines sarcopenia and obesity. This study examined the frequency of SO in young Korean females between 20 and 29 years of age. METHODS: The study involved 1,000 participants. The height, weight, body mass index (BMI), waist circumference, skeletal muscle mass index, fasting glucose, triglyceride, total cholesterol levels, systolic and diastolic blood pressure, alcohol consumption, and smoking status were the research variables. The skeletal muscle mass index was calculated as appendicular skeletal muscle mass (ASM) divided by the BMI. The ASM was assessed using dual X-ray absorptiometry. Complex sampling analysis and multiple logistic regression were used for analysis. RESULTS: A .74(.30-1.80) frequency of SO was observed. The statistically significant risk factors in females were height, weight, BMI, waist circumference, skeletal muscle mass index, total cholesterol, systolic blood pressure, and diastolic blood pressure (p < .05). CONCLUSION: Young Korean adults with SO have a .74(.30-1.80) frequency of occurrence that is linked to specific risk factors. Hence, primary care clinicians and health care professionals should consider these factors when patients require a referral for early detection and treatment. Healthcare professionals and clinicians can identify potential SO patients by acknowledging these risk factors.

• Journal of Korean society of Dental Hygiene
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• v.15 no.1
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• pp.1-9
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• 2015

Objectives: The purpose of this study is to investigate the use of happiness index in dental hygienists. This study can be used to improve the quality of life and the turnover intention in the dental hygienists. Methods: The subjects were 281 dental hygienists in Seoul, Gyeonggi-do, and Chungcheong province. A self-reported questionnaire was completed by the subjects. The questionnaire consisted of 7 questions of general characteristics of the subjects, 7 questions of dental hygiene performance, and 9 questions of happiness index. The instrument for happiness index was modified from Suh and Koo. Cronbach's alpha was 0.850 in the happiness index measure by Likert 7 scale. The instrument for professionalism was modified from Baek and consisted of 25 questions measure by Likert 5 scale. Cronbach's alpha was 0.694 in the professionalism. The instrument for turnover intention was modified from Lee and consisted of 5 questions measured by Likert 5 scale. Cronbach's alpha was 0.712 in turnover intention. Data were analyzed using SPSS 18.0. for one way ANOVA, Duncan posthoc test, Pearson correlation coefficients and hierarchical regression. Results: The means of happiness index, professionalism and turnover intention of subjects were 4.44, 3.06 and 3.05, respectively. The happiness index was higher in those who are married(4.66), those who have high income, and those who have careers in dental hygienists(4.61). There were significant differences in the happiness index by the average daily working hours, place of treatment, work intensity and off duty hours. Conclusions: This study suggests that improvement of the happiness index in clinical dental hygienists requires the continuing and systematic education program and administrative support that can reduce the turnover intention.

• Journal of the Korean Mathematical Society
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• v.58 no.5
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• pp.1299-1309
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• 2021

Demeter [1] and Kuk and Lee [5] proved the unboundedness of the trilinear Hilbert transforms H_a,b,c under the critical index 1/2 for some parameters a, b and c. We show the unboundedness of H_a,b,c for any parameters.

• Journal of Industrial Technology
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• v.20 no.A
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• pp.269-278
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• 2000

The pressure-time profile of the explosion gases can controlled for the use of cartridge explosive with two techniques known as Decoupling and spacing of the charges. Decoupling consists of a space between the explosive column and wall of the blast hole. Four different decoupling index 1.4, 1.8, 2.34, 3.0 are selected in this field study. The level of ground vibrations with each decoupling index was measured and the empirical particle velocity equation from these data was obtained. The condition of new cracks at blast hole are also examined. As the decoupling index is increased, the level of the blast vibration is decreased. But the cracks in rock masses are efficiently formed to remove the broken rock. The vibration constant associated with test sites is given as $K=1564.5(D.L)^{-1.3233}$ in terms of D.I.(decoupling index).

• Journal of the Korean Ceramic Society
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• v.46 no.1
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• pp.10-15
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• 2009

We have fabricated silicon-rich silica thin films via RF magnetron sputtering using a SiO target. Thickness evolution and microstructure change of such $SiO_x$ (1$SiO_x$ thin films turned out to be mainly responsible for the increase of refractive index.

• Korean Journal of Community Nutrition
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• v.21 no.1
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• pp.102-111
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• 2016

Objectives: The intention of this study was to find out the impact of mother's body mass index, eating habits, nutrition status and sociodemographic factors on the body mass index of the children. Methods: The study used original data of Korea National Health and Nutrition Examination Survey (2010-2011) and had 957 children in the ages of 1-5 years and 957 mothers of these children, a total 1,914 as subjects. The weights (body mass indexes) of the children, subjects under 5th percentile were classified into a underweight group, 5~84th percentile into a normal weight group, 85-94th percentile into an overweight group and more than 95th percentile into an obesity group based on the 2007 Korean children and adolescents growth chart. Results: We observed that when the body mass index of a mother increased by 1, the possibility that her child would belong to the overweight group increased by 6.5% (95% confidence interval: 1.01~1.13), and the possibility that the child would belong to the obesity group increased by 95% (confidence interval: 1.01~1.18). With regard to the number of deficient nutrients which were ingested according to estimated average requirements (EAR) amid nutrients ingested by the mother increased by 1, the possibility that the child would belong to the obesity group increased by 16.6% (95% confidence interval: 1.01~1.35). In case the birth weight of child increased by 1kg, the odds ratio that the child would belong to the obesity group was 2.022 (95% confidence interval: 1.08~3.77). Conclusions: We conclude that the body mass index, eating habits and nutrition status of the mother had significant effects on the body mass index of the child. Therefore, it is critical to recognize the importance of this observation and provide practical training for eating habits and nutrient intakes in order to achieve healthy growth and prevention of obesity among children.