• Journal of the korean academy of Pediatric Dentistry
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• v.24 no.1
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• pp.247-264
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• 1997

501 preschool children from 4 to 6 years were examined for their salivary reductase activity and caries experience by Resazurin Disc Test and dental examination respectively. We asked the parents about their children's oral hygiene habits, between-meal eating habits, and physical exercise habits by the questionnaire. Toothbrushing frequency had negative relation to salivary reductase activity and caries experience. Caries experience was low when parents did toothbrushing for children, when teeth were brushed at bedtime, and when fluoride toothpastes were used. Salivary reductase activity and caries experience were high in bread & cookies group, chocolates & candies group, milk & soft drink group, and fruits & vegetables group in order. Caries experience was high in case of irregular between-meal eating. Sweet food eating frequency had positive relation to caries experience. Caries activity was low in case of eating homemade non-sweet between-meals. Salivary reductase activity and caries experience were low when gum-chewing frequency was high. Salivary reductase activity and caries experience were high when the amount of physical exercise was low.

• Journal of Fisheries and Marine Sciences Education
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• v.17 no.1
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• pp.35-47
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• 2005

The purpose of this study is to investigate various kinds of discipline problems in middle school classrooms, and the differences in severity and frequency of the classroom discipline problems between male and female students' classrooms in middle schools. This study shows that the discipline problems in the middle school classrooms include using a cellular phone, chattering, sleeping, chewing gum, reading comic books, asking useless questions, challenging a teacher, fighting, calling names, skipping class, throwing trash in the classroom, breaking classroom equipment, creating disorder, losing materials, playing with a ball in the classroom, gambling, and so on. Generally, male students recognized the severity of the classroom discipline problems more than the female students. However, it is shown that the frequency of discipline problems in male students' classrooms is higher than that in female students' classrooms. From the results of this study, male students have more active discipline problems (playing with a ball in the classroom, throwing trash in the classroom, coming to class late, gambling, cutting in line, and so on). On the other hand, female students have more passive discipline problems (making a noise by using a cellular phone, asking useless questions, sending messages to a classmate, studying other subjects, scattering, and so on).

• Journal of Oral Medicine and Pain
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• v.20 no.2
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• pp.407-420
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• 1995

This study was performed to evaluate and compare conservative treatment results by several parameters such as age, sex, symptom duration, type and timing of joint sound, parafunctional habits, splint type, and diagnostic classification. There have been too many articles reporting long term results of conservative treatment but articles related to comparison of treatment results by patients' self-evaluation have been rarely reported. For this study 258 patients with temporomandibular disorders(TMDs) were selected and examined by routine diagnostic procedure for TMDs. The subjects were classified into 5 TMDs subgroups ad treated with conservative treatments involving splints, physical modalities, jaw exercises, and counseling. Visual analogue scale(VAS) about pain, joint sound, and mouth opening limitation was recorded respectively during treatment period. From the VAS data and treatment duration, VAS treatment index(VAS Ti) was calculated. The obtained results were as follows : 1. Pain was the most frequent main symptom in subjects with temporomandibular disorders, and main symptom for mouth opening limitation was comparatively less than for pain or sound in disk displacement with reduction group or in degenerative joint disease group. 2. Degenerative joint disease group had the most poor treatment results and highest occlusal index of Helkim's index. 3. Good prognosis for conservative treatment was observed in acute group, under 6 months than chronic group, 6months over in symptom duration, and subjects with 40 years over in age showed the most poor prognosis. 4. Subjects treated with anterior repositioning splint had better treatment results than subjects treated with centric relation splint, but statistical significance in VAS Ti and treatment duration was not observed. 5. Treatment results according to affected side, types and point of joint sound did not show consistent statistical results. 6. The result for conservative treatment was observed poor in subjects with bruxism and clenching. 7. In studying coincidence between preferred chewing and affected side, frequency of preferred chewing side, in unilateral affection, was higher in ipsilateral than in contralateral side.

• Journal of Korean society of Dental Hygiene
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• v.23 no.5
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• pp.361-368
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• 2023

Objectives: This study investigated the oral health and quality of life of patients with hypertension using the raw data of the 8th National Health and Nutrition Examination Survey, the second year (2020) and 1,269 subjects were analyzed. Methods: The data underwent frequency analysis, descriptive statistics, general linear model analysis, and linear regression analysis using SPSS Statistics 26.0. Results: The quality of life (EuroQol-5 dimension: EQ-5D) of patients with hypertension was surveyed at 0.92 points/1 point. Quality of life according to general characteristics showed significant differences in gender (p<0.001), age (p<0.001), household income (p<0.001), and education level (p<0.001). Quality of life according to oral health showed significant differences in chewing discomfort (p<0.001), speaking discomfort (p<0.001), oral examination (p=0.004), toothache experience (p=0.020), subjective oral health (p<0.001) and oral care product use (p=0.006). Factors affecting quality of life were gender, age, household income, education level, chewing discomfort (B=-0.027, p=0.018), speaking discomfort (B=-0.049, p=0.026), toothache experience (B=-0.018, p=0.027) and subjective oral health (B=0.022, p<0.001). Conclusions: Based on the above results, it was confirmed that the oral health of patients with hypertension is a factor influencing the quality of life; thus, it is considered that it will be used as basic data for research on measures to improve oral health and quality of life.

• Proceedings of the KIEE Conference
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• 1996.07c
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• pp.1910-1912
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• 1996

This paper presents the results of laboratory experimentals to remove $SO_2$ and $NO_x$ by a pulsed corona discharge in the wire-plate reactor. A rotating spark gap switch was used to generate the pulse by chewing the dc high voltage. Repetition frequency of the pulse was 60Hz and rising time of 50ns. The photo pictures of positive streamer corona taken by ICCD camera, pulse voltage and current were measured using a digital oscilloscope. Simultaneous effects of $C_{2}H_{4}$ injection and heterogeneous chemical reactions on nonthermal plasma process to remove $SO_2$ and $NO_x$ from flue gas were investigated in the present study

• Journal of Korean society of Dental Hygiene
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• v.19 no.6
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• pp.931-939
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• 2019

Objectives: The purpose of this study was to determine the importance of brushing before sleeping by comparing the use of oral care products, frequency of dental clinic visits, and oral conditions between individuals who brush and do not brush their teeth before sleeping using data from the 5th and 6th Korean National Health and Nutrition Survey (KNHANES). Methods: Statistical analysis was performed using SPSS 21.0 on data files obtained according to a complex sampling design, and a significance level of <0.05 was set. General characteristics of the participants and year were analyzed using chi-square analysis. Data on the oral conditions, use of oral care products, and frequency of dental clinic visits were analyzed using logistic regression and linear regression. Results: Individuals who brushed their teeth before sleeping showed greater use of oral care products and more frequent dental clinic visits, oral examinations, preventive treatment, and treatment for simple caries (p<0.05) than individuals who did not. Individuals who did not brush their teeth before sleeping showed higher prevalence of permanent teeth caries and periodontal disease, as well as chewing and speaking problems (p<0.05), than those who bushed before sleeping. Conclusions: Individuals who do not brush before sleeping exhibit poorer oral health and lower use of oral care products and frequency of recent dental treatment than those who brush before sleeping. Therefore, it is necessary to alter the government's active policy and improve education about the importance of brushing before sleeping to improve oral health.

• Journal of Convergence for Information Technology
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• v.10 no.10
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• pp.268-272
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• 2020

This study will be used as basic data for the prevention of suicide ideation and the promotion of oral health of economic activity by studying the data of National Health and Nutrition Survey in Korea to find out the relationship between the oral health and suicidal ideation in Korea economic activity. The collected data was based on the IBM SPSS Statistics 20.0 program, and the analysis method is to analyze the frequency of complex samples, Chi-square test of complex samples and logistic regression analysis of complex samples were performed. According to the study, discomfort chewing 2.49 times higher in relation to oral health and suicidal ideation. Therefore, it suggests the need for oral health care to prevent suicide ideation of economic activity.

• Asian-Australasian Journal of Animal Sciences
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• v.13 no.9
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• pp.1219-1227
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• 2000

Rumination behavior, in vivo digestibility of cell wall constituents, particle size reduction in the rumen, and retention time in the digestive tract of sheep were examined using rice and oat straw as roughage sources. The in sacco digestibility, rumen fermentation, and microbial population and internal adenosine 5-triphosphate (ATP) content were also determined under feeding conditions of high-roughage and high-concentrate diets. Chewing number and time in rumination behavior were higher with rice straw than with oat straw, while the in sacco and in vivo DMD of rice straw were consistently lower than those of oat straw. Rice straw also showed higher frequency of thinner and longer particles in the rumen contents and lower retention time in the whole digestive tract as compared to those of oat straw. Rice straw was more effective to maintain the ruminal pH than oat straw, being reflected in higher internal ATP content of large-type protozoa on the high- concentrate diet. Changes in the ruminal microflora by shifting from the low- to the high- concentrate diet were also different between rice and oat straw.

• Journal of the East Asian Society of Dietary Life
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• v.27 no.1
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• pp.17-28
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• 2017

The objectives of this study were to assess food intake frequency and food behavior of infants and toddlers by using the Nutrition Quotient (NQ). A total of 368 subjects (infants 111, toddlers 257) in Ganghwa county were analyzed in this study. The NQ was examined using an NQ questionnaire, which consisted of 19 food behavior checklist items. The items were grouped into five categories: balance, diversity, moderation, regularity, and practice. All data were statistically analyzed by SPSS 20, and significant difference was evaluated by Student's t-test and $x^2-test$. The BMIs of infants and toddlers were $16.54kg/m^2$ and $16.01kg/m^2$, respectively. The frequencies of consumption of vegetables and fruits were higher (p<0.001) in girls and toddlers compared to boys and infants, respectively. Food behavior of meal regularity (p<0.001), breakfast eating (p<0.001), and chewing well (p<0.001) were also higher in toddlers compared to infants. Total NQ score of infants and toddlers were 62.05 and 64.91, respectively, which were within medium grade. The NQ score of toddlers was higher than that of infants (p<0.0.5). NQ score was positively correlated with parent's education, monthly income, age, and exercise. Therefore, children and their parents need proper nutrition education and counseling to correct their eating habits and improve their nutritional status.

• Journal of Korean society of Dental Hygiene
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• v.22 no.4
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• pp.289-295
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• 2022

Objectives: In this study, raw data from the 7th (2016-2018) of the Korea National Health and Nutrition Examination Survey were used, and a total of 2,430 people were selected as participants to analyze the factors related to unmet dental care needs in postmenopausal women. Methods: Frequency analysis, cross analysis, and logistic regression analysis were performed for general characteristics, oral health characteristics, and unmet dental care needs related factors using IBM SPSS Statistics 21.0 program. Results: The unmet dental care related factors were 1.527 times higher in the case of not having oral examinations than in the case of having oral examinations. For those who did not make use of the dental clinic, 8.667 times, 2.913 times for bad oral health, and 1.912 times for usually showed that unmet dental care was higher. Inconvenience with speaking was 1.578 times higher, and in the absence of implants, unmet dental care needs was 1.510 times higher. In the case of no chewing difficulty, was 0.380 times lower. Conclusions: Based on the above results, in order to achieve the policy goal to reduce unmet dental care needs, policy support and interest are needed above all to accurately identify and solve specific problems.