• The korean journal of orthodontics
• /
• v.32 no.6 s.95
• /
• pp.401-411
• /
• 2002

Precise bracket positioning is essential in modem orthodontics. However, there can be alterations in the vertical position of a bracket due to several reasons. The purpose of this study was to evaluate the effect of variations in the vertical bracket position on the crown inclination in Korean patients with normal occlusion. From a larger group of what was considered to be normal occlusions obtained from the Department of Orthodontics, College of Dentistry, Seoul National University, each of the final 10 subjects (6 males and 4 females, with an average age of 22.3 yews) was selected. The dental models of each of the subjects were scanned three-dimensionally by a laser scanner, and measurements drawn from these were made on the scanned dental casts of the subjects were input into the computer program. From this the occlusal plane and the bracket plane were determined. The tooth plane was then constructed to measure the crown inclination on the bracket plane of each tooth. From a practical standpoint, information was obtained on the extent to which the torque of a tooth would be changed as the bracket position was to be moved vertically (in ${\pm}0.5mm,\;{\pm}1.0mm,\;{\pm}1.5mm$) from its ideal position. A one way analysis of the variance (ANOVA) was used to compare each group of the different vertical distances from the bracket plane on a specific tooth. Duncan's multiple comparison test was then performed. There were statistically significant differences in the crown inclination among the groups of different vertical distances for the upper central incisor, upper lateral incisor, upper canine, upper first and second molars, lower first and second premolars, and lower first and second molars (p<0.05). On the upper anterior teeth, upper molars, lower premolars and lower molars, the resultant torque values due to the vertical displacement of the bracket were different depending on the direction of the displacement, occlusal or gingival. This study implies that the torque of these teeth should be handled carefully during the orthodontic treatment. In circumstances in which the bracket must be positioned more gingivally or occlusally due to various reasons, it would be useful to provide the chart of torque alteration of each tooth referred to in this study with its specified bracket prescription.

• Korean Journal of Food Science and Technology
• /
• v.5 no.1
• /
• pp.16-24
• /
• 1973

Breads were made from composite flours based on domestic resources and their quality was assessed to obtain the following results. 1) When barley bread was made according to the formula for standard wheat bread, its specific loaf volume (SLV) was quite low (1.3 at 100% addition of water) in comparison with 3.3 for wheat bread. Addition of 10% defatted soy flour increased its SLV to 1.7 (at 100% water). Among various flour-improving additives, the use of 1.5% GMS + 0.5% CSL gave best results (SLV: 2.0 at 100% water). Admixture of wheat flour with the composite flour based on barley was most effective. Replacement of barley flour with 25% wheat flour gave SLV of 2.8 (at 90% water) and that with 50% wheat flour gave SLV of 3.2 (at 90% water), comparable to standard wheat bread with respect to loaf volume, color and texture. 2) Sweet potato bread had the characteristics of turning black-brown on baking. Use of 20% defatted soy flour and GMS + CSL gave higher SLV (1.9 at 100% water). Addition of wheat flour at 25% or 50% level to the composite flour based on sweet potato flour gave SLV of 2.3 and 2.6, respectively, at 90% water and its color and texture were improved 3) Potato flour was different from sweet potato flour in baking, the effect of GMS + CSL being quite low. Bread from corn flour was different from barley flour bread and defatted rice bran was not suitable for bread-making. 4) Bread was made from following composite flours based on naked barley and sweet potato flours along with the use of proper additives: (a) naked barley flour + defatted soy flour + wheat flour (45 : 10 : 45) (b) naked barley flour + defatted soy flour + wheat flour (67 : 10 : 23) (c) naked barley flour + defatted soy flour (90 : 10) (d) sweet potato flour + defatted soy flour + wheat flour (40 : 20 : 40) (e) sweet potato flour + defatted soy flour (60 : 20 : 20) Sensory evaluation of above breads in comparison with standard wheat bread (So) gave the following decreasing order of scores, So>(a)>(b)>(c)>(e)>(d) and Duncan's multiple range test showed that bread (a) was not different from standard wheat bread significantly at 5% level, in overall evaluation including color, texture, taste and flavor.

• Journal of Korean Public Health Nursing
• /
• v.16 no.2
• /
• pp.388-399
• /
• 2002

This study would tend to clarify effects on knowledge and attitudes of smoking by preventive education for the fifth grade student in elementary school. It would also hope to contribute to activate smoking preventive education, improvement of health quality for the young and reduce school children's misdeeds. One hundred and sixty-eight school children, the fifth grade student in K city's elementary school have been gathered as testees and divided into two groups : 84 in an experimental group and other 84 in a group for comparison.. Data has been collected between 27th November, 2001 and 8th February, 2002 and methods, which were based on literature study, have been developed by myself and used after reliability test. The process has been formed in this order - pre-survey, experiment (smoking preventive education), the first post-survey and the second post-survey. The pre-survey was to fill the questionnaire and the post survey has done with the same way in 2 and 9 weeks later. The smoking preventive education has been carried out 4 times and the time for each experiment was 40 minutes. The collected data has been analysed by the purpose into $\chi^2-test$, t-test,. F-test, Duncan multiple range test with SPSS. The results of study would be as follows 1. The rate of smoking experience is $17.3\%$ and the biggest motive $(75\%)$ is curiosity. Also $5.4\%$ of respondents reply to have friends smoking a little. 2. The first hypothesis - the group with smoking preventive education would have much knowledge about smoking than comparison group - would be supported with statistical data (t=-3.329, p=.000). 3. The second hypothesis - the group with smoking preventive education would show higher attitude than the other group - would also be backed by statistically meaningful difference (t=-3.856, p=.000). 4. The variables of extent for smoking knowledge would be school record and the variables of extent for smoking attitude is friends' smoking, parents' reaction, experience until now and plan from now on.

• Restorative Dentistry and Endodontics
• /
• v.27 no.5
• /
• pp.488-492
• /
• 2002

The purpose of this study was to evaluate the effectiveness of plasma arc curing (PAC) unit for composite and compomer curing. To compare its effectiveness with conventional quartz tungsten halogen (QTH) light curing unit, the polymerization shrinkage rates and amounts of three composites (Z100, Z250, Synergy Duo Shade) and one compomer, that had been light cured by PAC unit or QTH unit, was compared using a custome made linometer. The measurement of polymerization shrinkage was peformed after polymerization with either QTH unit or PAC unit. In case of curing with the PAC unit, the composite was light cured with Apollo 95E for 6s, the power density of which was recorded as 1350 mW/$\textrm{cm}^2$ by Coltolux Light Meter. For light curing with QTH unit, the composite was light cured for 30s with the XL2500, the power density of which was recorded as 800 mW/$\textrm{cm}^2$ by Coltolux Light Meter. The amount of linear polymerization shrinkage was recorded in the computer every 0.5s for 60s. Ten measurements were made for each material. The amount of linear polymerization shrinkage for each material in 10s and 60s which were cured with PAC or QTH unit were compared with t test. The amount of polymerization shrinkage in the tested materials were compared with 1way ANOVA with Duncan's multiple range test. As for the amounts of polymerization shrinkage in 60s, there was no difference between PAC unit and QTH unit in Z250 and Synergy Duo Shade. In Z100 and Dyract AP, it was lower when it was cured with PAC unit than when it was cured with QTH unit (p<0.05). As for the amounts of polymerization shrinkage in 10s, there was no difference between PAC unit and QTH unit in Z100 and Dyract AP. The amounts of polymerization shrinkage was significantly higher when it was cured with PAC unit in Z250 and Synergy Duo Shade (p<0.05). The amounts of polymerization shrinkage in the tested materials when they were cured with QTH unit were Z250 (6.6um) < Z100 (9.3um), Dyract AP (9.7um) < Synergy Duo Shade (11.2um) (p<0.05). The amount of polymerization shrinkage when the materials were cured with PAC unit were Dyract AP (5.6um) < Z100 (8.1um), Z250(7.0um) < Synergy Duo Shade (11.2um) (p<0.05).

• Journal of the Korean Society of Food Culture
• /
• v.15 no.5
• /
• pp.398-412
• /
• 2000

The purposes of this study are : (a) to investigate the attitude to various coffee and tea of women, (b) to analyze the characteristics of each classified group according to eating frequency, and (c) to abstract the factors which can influence the consumption of coffee and tea. Questionnaires were hand delivered to 1,200 women residing in Seoul. A total of 1012 was usable: resulting in 84% response rate. Statistical data analysis was completed using SAS Package program for the one way-analysis of variance(ANOVA), Duncan's multiple comparison test, factor analysis and analysis of covariance (ANOCOVA). (a) Instant coffee was most consumed(22.1 times a month), green tea in tea bag(8.7), Donggulre tea(8.3), Coffee (72) in order of frequency. Among Korean traditional tea Donggulre tea(8.3) and Yuja tea (2.0) were most prefered but still a minute quantity of Korean traditional tea was enjoyed. (b) Coffee and Black tea was regarded unhealthful but habitual, delicious and familiar beverage. Green tea was regarded good for health but not so habitual, practical and familiar. The consumer awareness can be grouped into 3 clases : Healthy factor, Habitual Practical factor, Familiar factor. (c) The sociodemographic characteristics of women influenced the beverage consumption. Women in their 30s and 40s consumed much of instant coffee and coffee. 10s and 20s consumed much of canned coffee. Working women drank much of instant coffee and green tea in tea bag. Women in highest income group$({\geq}\;4,000,000\;won/month)$ consumed much of coffee. (d) The factors which influenced the eating frquency of those beverages were various. The eating frequency of instant coffee was influenced by the age, familiar factor and habitual practical factor. And coffee were influenced by income level, habitual practical factor. The frequency of green tea in tea bag was influenced by habitual practical factor and familiar factor, green tea was influenced by healthy factor and habitual practical factor, Donggulre tea was influenced by habitual practical factor.

• Restorative Dentistry and Endodontics
• /
• v.30 no.6
• /
• pp.493-504
• /
• 2005

This study was performed to investigate the compatibility between 4 dentin adhesives and 4 resin luting cements. Dentin adhesives used in this study were All-Bond 2 (Bisco Inc., Schaumbrug, IL, USA), Clearfil SE-Bond (Kuraray Medical Inc, Osaka, Japan), Prompt L-Pop (3M Dental Products, St. Paul, MN, USA), One-Up Bond F (Tokuyama corp., Tokyo, Japan) Resin luting cements used in this study were Choice (Bisco Inc., Schaumbrug, IL, USA), Panavia F (Kuraray Medical Inc, Osaka, Japan), RelyX ARC (3M Dental Products, St. Paul, MN, USA) Bistite II DC (Tokuyama corp., Tokyo, Japan). Combination of each dentin adhesive and corresponding resin cement was made to 16 experimental groups. Flat dentin surfaces was created on mid-coronal dentin of extracted mandibular third molars, then dentin surface was polished with 320-grit silicon carbide abrasive papers. Indirect resin composite block (Tescera, Bisco) was fabricated. Its surface for bonding to tooth was polished with silicon carbide abrasive papers Each dentin adhesive was treated on tooth surface and resin composite overlay were luted with each resin cement. Each bonded specimen was poured in epoxy resin and sectioned occluso-gingivally into 1.0mm thick slab, then further sectioned into $1.0{\times}1.0mm^2$ composite-dentin beams. Microtensile bond strength was tested at a crosshead speed of 1.0mm/min. The data were analysed by one-way ANOVA and Duncan's multiple comparison tests The results of this study were as follows, 2-step self-etching dentin adhesive which has additional bonding resin is more comparison than tests. self-etching dentin adhesive.

• Journal of the Korean Applied Science and Technology
• /
• v.37 no.3
• /
• pp.594-603
• /
• 2020

The aim of this study was to investigate the issue in obese children with a high probability of leading to precocious puberty for they have more advanced skeletal maturation compared to normal children in order to contribute to the health of obese children by identifying the relationship between physique and physical fitness according to their skeletal maturation. A total of 243 obese children between the ages of 10-13 were enrolled as subjects, and the skeletal maturation, which symbolize indicators of biological maturation, were evaluated by using the TW3 method after hand-wrist radiographs, thus classified the skeletal maturation level into retarded group(n=70), normal group(n=128), and advanced group(n=45). A stadiometer and InBody 270 (Biospace, Korea) were used to measure 3 components in physique. A total of 7 components in physical fitness, which included muscular strength, muscular endurance, flexibility, power, cardiovascular endurance, balance, agility, were measured as well. Descriptive statistics and one-way variable analysis (ANOVA) were conducted for data processing using SPSS 25.0, and Duncan's multiple-range method was used for post hoc analysis; and it was considered significant at the level of P< .05. Analysis results of this study may be summarized as follow. First, height and weight in physique factors according to the skeletal maturation between the retarded, normal, and advanced groups in males and females were highly significant. Second, physical fitness comparison according to the skeletal maturation in males were statistically significant in muscular strength, power, and agility whereas muscular strength and balance were statistically significant in females.

• Journal of Korean Academy of Nursing
• /
• v.26 no.1
• /
• pp.94-106
• /
• 1996

Nursing literature suggests that the self-concept of nurses gives an important implications to educators and administrators as well as clinicians for their professional development. With a view to exploring how nurses view themselves, the Professional Self-Concept of Nurses Instrument (PSCNI) using 27 Likert items was developed by Arthur in Australia in 1990. This study is an extension of the PSCNI using Korean samples with some modifications. A convenience sample was drawn from 800 nurses working in three university hospitals in Seoul ; three university hospitals in Kyonggi-do and a university hospital and a psychiatric hospital in Kangwon-do. Seven hundred questionnaires were analyzed using the statistical analysis system(SAS). The reliability of the scale was tested by test-retest and Cronbach's alpha. Differences in the PSCNI, which are closely related to demographic variables, were examined by t-test, ANOVA and the Duncan's multiple range test. Factor analysis was employed so as to examine component factors. The results are summarized as follows : 1. The test-retest reliability of the PSCNI was .79 and Cronbach's alpha was .85. Item correlations with total revealed consistent correlations and subscale reliability varied from .49 to .85. 2. The average score of PSCNI was 75.21 and average item score was 2.79. 3. Twenty four items were derived from the PSCNI 27 items and these items clustered in three component factors. The cumulative percent of variance was 38.12％ and for factor 1 was 22.81％, for factor 2, 9.79％ and for factor 3, 5.51％ respectively 4. A comparison of the scores for the dimensions of the PSCNI shows a relative difference in terms of mean item scores and in descending order, professional practice（m=2.83）, communication （m=2.82） and satisfaction（m=2.70）. 5. Professional self-concept of nurses was found to vary significantly according to age（P=.0001）, religion（P=.0001）, academic background（P= .0109）, marital status（P=.0001）, career（P= .0001） and position（P=.0001）. In conclusion, there was a correlation between professional self-concept of nurses, and life and work variables. This study provides an important message for administrators and nurse educators by highlighting factors which can be addressed by education programs, staff development and appraisal. While the test results largely confirm the Australian and Canadian tests, further research is necessary to improve the cumulative percent of variance instead of applying Arthur's PSCNI directly to Korean nurses.

• Child Health Nursing Research
• /
• v.5 no.2
• /
• pp.151-166
• /
• 1999

The purposes of this study were to measure the degree of perceived uncertainty, social support & powerlessness, to examine the relationship between the perceived uncertainty, social support & powerlessness and then to find the predictors of powerlessness in mother's of handicapped children. The subjects of this study consist of 102 mothers of handicapped children, registered at rehabilitation & handicapped children school. Data was collected from September 1998 to March 1999. The tools used in this study were Mishel's the Parents' Perception of Uncertainty Scale (28 item, 4 likert scale), Miller's Powerlessness measurement Scale(28 itewt 4 likert scale) & Cohen's Interpersonal Support Evaluation List (40 items, 4 likert scale). Data was analyzed by t-test, ANOVA, Duncan comparison, Pearson Correlation coefficient & Stepwise multiple regression Results of this study are summarized as follows : 1. Mothers perceived their uncertainty to be slightly high(Mn 2.50). The degree of perceived uncertainty by the four components were followed as : lack of clarity(2.69), unpredictability(2.56), ambiguity(2.56) & lack of information(2.46). The degree of perceived uncertainty of the mothers of handicapped children revealed to be influenced significantly by age of children, admission experience, disability types of children. 2. The degree of mothers' powerlessness was measured to be slightly high(Mn 2.14). The degree of perceived powerlessness of the mothers with handicapped children revealed to be influenced significantly by age of children, duration of illness admission experience,8E marital status of the mothers. 3. Mothers perceived their social support to be slightly high(Mn 2.71). The degree of perceived social support revealed to be influenced significantly by sex of children, married state of mothers. 4. Mothers' uncertainty was related positively to the mothers' powerlessness(r=.33, p=.0008). And also mothers' powerlessness was related inversely to social support(r=-.50, p=.0001). But, mothers' uncertainty was not related to social support significantly. 5. To analyze the variables which affect powerlessness, stepwise regression was implemented. As a result, about 61% of the powerlessness were explained by social support, marital status of the mothers and perceived uncertainty. Based upon these results, it is recommended that the nurses, who are caring handicapped children and their families, provide various support programs for them to overcome their difficulties. Also programs which decrease the uncertainty & powerlessness used social support multidimensionally & individually are recommended to be developed.

• Journal of Yeungnam Medical Science
• /
• v.11 no.2
• /
• pp.338-351
• /
• 1994

This study was to find out whether there were differences in the levels of depressions between positive and negative schizophrenics. This research was derived from the fact that negative schizophrenics show higher levels of depression than positive schizophrenics. This study also examined the levels of psychomotor dysfunction in positive and negative schizophrenics. For this study, there were 453 subjects. They consisted of 119 positive schizophrenics, 122 negative schizophrenics and 212 normal people. They were asked to complete Zung's Self-Rating Depression Scale(SDS) and to perform one subtest, Digit Symbol of KWIS(Korean Wechsler Intelligence Scale). Subjects' levels of depression were measured by the SDS. the level of psychomotor dysfunction was measured by Digit Symbol subtest of Korean Wechsler Intelligence Scale. ANOV A and Duncan's multiple comparison analysis were used to examine whether there were differences of depression and psychomotor dysfunction among the normal people, positive and negative schizophrenics. The results were as follows: It was found that the depression level was higher in the negative schizophrenic patients than positive schizophrenic patients. Levels of depression were significantly higher in negative schizophrenics than positive schizophrenics. Psychomotor retardation symptom was the most effective variable that discriminates between the normals and the schizophrenics. And it would be concluded that the psychomotor dysfunction was more severe in negative schizophrenics than positive schizophrenics.