• 호남수학학술지
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• 제26권4호
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• pp.471-481
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• 2004

In this paper we introduce the notion of a (pre-)Coxeter algebra and show that a Coxeter algebra is equivalent to an abelian group all of whose elements have order 2, i.e., a Boolean group. Moreover, we prove that the class of Coxeter algebras and the class of B-algebras of odd order are Smarandache disjoint. Finally, we show that the class of pre-Coxeter algebras and the class of BCK-algebras are Smarandache disjoint.

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
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• pp.576.2-576
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• 2001

The purpose of this study was to evaluate the effect of dentinal sclerosis and tubular orientation on Class V restoration bonded with three dentin bonding agents using confocal laser scanning microscope(CLSM). Class V cavities were prepared from freshly extracted caries-free human teeth. thirty of these cavities were divided into two groups based upon the status of class V cavities: Group 1, cervical abrasive lesions without preparation; Group 2, artificially-prepared wedge-shaped cavities.(omitted)

• 대한치과기공학회지
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• 제42권4호
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• pp.394-401
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• 2020

Purpose: The present study is an analysis of the extents of class satisfaction of college students who had applied the design thinking technique to capstone design class. Methods: The experimental method involved an analysis of 122 cases of data where advance and post replies were performed for the subject by students who had applied the design thinking technique and students who had not. The students involved had attended the capstone design class as a junior in the Department of Dental Technology at D University. Results: In the satisfaction with performance process of the capstone design class, five questions among nine had a high positive rating, while all eight questions on the satisfaction with performance methods had a high negative rating. Among ten questions on subjective learning outcomes, six showed a high positive rating. After the application of the design thinking class method, all mean values of the group with the application were higher than the group with no application in satisfaction with performance process, satisfaction with performance method, and subjective class outcomes. Hence, the design thinking class did have positive effects on the students' improvement of class. Conclusion: Based on the results of the study, it is implied that the considerations about diverse class composition methods and operation methods capable of improving the students' satisfaction are needed for efficient operation of the capstone design class.

• Restorative Dentistry and Endodontics
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• 제7권1호
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• pp.131-138
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• 1981

The purpose of this study was to evaluate the marginal leakage of composite resin. Preparing 144 class V cavities on freshly extracted noncarious teeth, composite resins were prepared and inserted by one dentist according to the manufacturer's instructions. The experiments were performed in two different groups; In group I; Class V cavities with $90^{\circ}$ cavosurface angle, In group II; Class V cavities with $135^{\circ}$ cavosurface angle. And each group was divided 2 subgroups; In control group; composite resin restoraions without acid etch technique. In experimental group; composite resin restorations with acid etch technique. All specimens were immersed in 0.05% crystal violet solution. Before examination, the restored teeth were subjected to thermal stress. The specimens were sectioned occlusogingivally through the center of the restorations with a diamond disk. The sections were examined under a reflected light microscope at 1 day, 7 days and 30 days after immersing the specimens in dye solution. The results were as follows; 1. Control group of group I and group II showed marginal leakage. 2. The degree of marginal leakage in experimental group was greater reduced than control group. 3. In control group, the degree of marginal leakage in group I was greater than group II. 4. In experimental group, there is not statistical differences of the degree of marginal leakage between group I & group II.

• 여성건강간호학회지
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• 제8권3호
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• pp.345-357
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• 2002

The purpose of this study is to find out how the Father Class, which is being practiced at a hospital located in Seoul, influences on fathers' level of knowledge and confidence of postpartal mother and newborn care. Research design was quasi-experimental study using non equivalent experiment and control group. The data, questionaires, were collected from Sep. 13, 2001 to Oct. 31, 2001 through e-mail, telephone and mail, after discharge from S hospital located in Seoul, where the experimental group was educated at the Father Class and control group didn't take part in the class. The objects were the fathers who have the first baby through normal delivery or C-sec delivery including experimental group 48 persons and control group 52 persons. Four instruments were the revised ones of Lee Mi Kyoung's(1990) and Kwak Yon Hee's tool based on the resources of direct interviews of fathers and one expert, professor. The reliability of four instruments were Cronbach's $\alpha$ scores .85 -93. Data were analyzed by SPSS 10.0 program using $x^2$-test, and t-test and, One- way ANOVA, and Pearson correlation, etc. The results of this study are as follows; 1.The two groups were confirmed as a homogeneous group by showing no significant difference statistically at the level of 5%. 2.The results of proving the hypothesis are followings: 1)The first hypothesis, "the fathers who participated in the Father Class will have the higher level of knowledge about postpartal mother care than the fathers who didn't" was accepted by significant difference statistically (p=0.000). 2)The second hypothesis, "the fathers who took part in the class will have the higher confidence in postpartal mother care than the fathers who didn't", was supported by significant difference statistically (p=0.000). 3) The third hypothesis, "the fathers who attended the class will have the better knowledge about taking care of newborn than the others", was accepted by significant difference statistically (p=0.000). 4)The fourth hypothesis, "the fathers who participated in the class will have the higher confidence in newborn care than others," was supported by significant difference statistically (p=0.000). 3.The further analysis showed whether they participated in Prenatal Birth Preparing Class influenced on the father's level of knowledge and confidence in postpartal mother and newborn care. In conclusion, the Father Class is the effective nursing intervention strategy that can help new fathers attain father and husband roles by enhancing the level of confidence in and knowledge of the postpartal mother and newborn care.

• 대한치과교정학회지
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• 제32권1호통권90호
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• pp.33-42
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• 2002

본 연구는 골격성 III급 부정교합자의 두부방사선사진 분석을 통하여 수평적, 수직적 골격 형태에 따른 치아치조특성의 차이를 알아보기 위하여 시행되었다. 전북대학교 치과대학병원 교정과에 내원한 골격성 III급 부정교합자중 교정 치료의 경험이 없는 남자 29명, 여자 31명, 합계 60명(평균나이 :남자 19.4세, 여자 20.2세)의 표본을 연구 대상으로 하여 III급 부정교합의 치아, 치조의 보상적 변화 양상을 분석하여, 다음과 같은 결론을 얻었다. 1. 골격성 III급 부정교합자군는 남녀 모두 정상교합보다 작은 IMPA를 보였다(p<0.01). 2. 골격성 III급 부정교합자 남녀군 모두에서 하악골의 전후방적 위치를 나타내는 SNB 및 NtoPog은 하악전치의 전후방 경사를 나타내는 IMPA와 음의 상관관계를 보였다(p<0.01). 남자군에서는 SNB가 SNU1, FHU1, PalU1과 양의 상관관계를 보였으나(p<0.01), 여자군에서는 SNU1만이 상관관계를 보였다(p<0.01). 3. 골격성 III급 부정교합자의 남자군에서 하악골의 수직적 위치관계를 나타내는 SNMP, FMA, PalMP와 하악전치의 전후방 경사를 나타내는 IMPA는 음의 상관관계를 보였으나(p<0.01), SNU1, FHU1, PalU1과는 상관관계를 보이지 않았다. 골격성 III급 부정교합자의 여자군에서는 FMA, PalMP와 IMPA가 음의 상관관계를 보였다(p<0.01). 4. 골격성 III급 부정교합자군에서 high angle군에서 low angle군과 비교하여 SNU1, IMPA가 작은값을 보였다(<0.05).

• 수산해양교육연구
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• 제29권3호
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• pp.799-810
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• 2017

In this study, to raise the scientific literacy for students, the teaching and learning program was developed by applying the Circle Map. The purpose of this study was to find out the Effect of Elementary Science Teaching Program with Circle Map on Learning Motive and Learning Achievement. To this end, the 6th grade classroom of A-elementary school located in Jeju-city was selected the experimental group (25 patients). And the other 6th grade classroom in the same school was selected to the comparative group (25 patients). The experimental group was conducted applying the Circle Map. Comparison group has been conducted lesson program in accordance with the general science class teacher guide. Was through a pre-test of science learning motivation and academic achievement level can be assumed in the same group. After completing the experimental treatment by conducting a post-mortem examination was statistically validated. In this study, the following conclusions were obtained. First, elementary science class which applied Circle Map had the effect of to improve the scientific motivation(p <.05). In particular, association in the experimental group were higher than the scores of the comparative group, the difference was significant. Second, the Circle Map applied to elementary science class had a significant effect on improving science achievement. The experimental group which applied Circle Map was higher than the comparative group in science achievement post-test comparison. Between the groups showed a significant difference between the two groups(p <.05). The above findings, Elementary science class which applied Circle Map can be concluded to be effective in science and science achievement motivation. Therefore, applying the Circle Map of elementary science class could be useful in science teaching and learning methods. In addition, when it is determined through the previous study, applying the Circle Map classes will be able to derive a meaningful learning also subjected to a number of fields and areas.

• 한국의류학회지
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• 제10권2호
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• pp.37-50
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• 1986

The purpose of this study is to compare and to analyse the difference of middle school girls clothing behaviors and their preference for clothing styles according to their intelligence, socio-economic status, and physical constitution. For the study, data were collected from 378 middle school girls resided in Taegu: one half from high intelligence group over I.Q. 113, others from low intelligence group under I.Q. 87 using the questionaire method. For the measurement of the relationship clothing behavior, socio-economic status. Rohrer index, preference style of clothing were examined. The analysis of the data was managed by computer; frequency, percentage, mean, standard deviation, t-test, and ANOVA. The results of the study are as follows; 1. The significant difference in clothing behavior according to intelligence was verified in four: modesty, comfort, management, and psychological dependence. 2. The significant difference in clothing behavior according to socio-economic status was verified in all of eight clothing behavior variables. 3. There was no significant difference according to physical constitution in all clothing behavior variables. 4. There was no significant difference in the preference styles of clothing according to intelligence, but high intelligence group took more interest in detailed factors; design, style, total combination, color, print, and comfort. 5. The upper and middle class preferred slacks and lower class preferred skirts. The upper class took interest in design-style, total combination, and comfort, the middle class in total combination. and comfort, and the lower class in total combination. 6. Thin group preferred skirt, the average group preferred slacks, fatty group preferred slacks and shirts-blouse. Thin group took interest in design-style, and color-print, the average group in total combination, and fatty group in total combination, color-print, and design-style.

• 대한수학회보
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• 제44권4호
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• pp.771-775
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• 2007

In this note we discussed the half-factoriality of Krull monoid domain D[S] whenever the monoid S has trivial divisor class group.

• Journal of Periodontal and Implant Science
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• 제29권3호
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• pp.519-540
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• 1999

The purpose of this study is to compare the healing aspects of the use of ePTFE membrane alone versus combination treatment of ePTFE membrane and bone grafts on class II furcation defects. Seventeen defects were applied ePTFE membrane alone on mxillary molar buccal class II furcation defects as Group I, seventeen defects were applied ePTFE membrane and bone grafts on maxillary molar buccal class II furcation defects as Group II, twenty-three defects were applied ePTFE membrane alone on mandibular molar buccal class II furcation defects as Group III, twenty defects were applied ePTFE membrane and bone grafts on mandibular molar buccal class II furcation defects as Group IV . Measurements were made to determine clinical attachment level, probing depth, gingival depth, SBI, mobility at baseline, 3, 6, 12 months postoperatively. Additional measurements were made to determine membrane exposure level at surgery, 1, 2, 6 weeks postoperatively. And then healing patterns and postoperative complications were evaluated. The result as follows : There were statistically significant differences in probing depth reduction, clinical attachment gain, mobility reduction at values of 3, 6, 12 months postoperatively compared to values of baseline(p<0.05), whereas no significant differences in SBI and gingival recession. In group II, membrane exposure level was increased at 1, 2, 6 weeks postoperatively compared to value of baseline(p<0.05). There were statistically significant differences in changes of probing depth at 3, 6, 12 months postoperatively in combination groups of ePTFE membrane and bone graft compared to groups of ePTFE membrane alone(p<0.05). The vast majority of cases fall into typical healing and delayed healing response when membranes were removed in all groups. Pain and swelling were common postoperative complications. In conclusion, this study was showed more effective healing aspects in combination treatment of ePTFE membrane and bone graft than ePTFE membrane alone and on mandibular molar class II furcation defects than maxillary molar.