• The Journal of the Korean dental association
• /
• v.19 no.1 s.140
• /
• pp.67-71
• /
• 1981

This study was undertaken to find out the characteristic craniofacial morphology of Class II Division 2 malocclusions in children by means of roentgenocephalometry. The subjects consisted of twelve boys and thirteen girls with Class Ii, Division 2, thirty seven boys and fifty three girls with Class II, Division 1, and forty six boys and eighty one girls with normal occlusion, ranged from 10 years old to 18 years old. The following results were obtained; 1. The anteroposterior relationship of the maxilla to the cranium in the Class II, Division 2 malocclusion similar to the normal occlusion, but the mandible was the posterior position in th the cranial anatomy. 2. There were no significant differences in the anteroposterior relationship of the maxilla and the mandible between Class II, Division 1 and Class II, Division 2 malocclusions. 3. In Class II, Division 1 the axes of maxillary incisors showed labial inclination, but lingual inclination in Class II, Division 2 malocclusions. 4. Overbite was prominent one in Class II, Division 2, on the other hand overjet was distinguished in Class II, Division 1.

• Korean Journal of Child Studies
• /
• v.22 no.4
• /
• pp.201-212
• /
• 2001

The purpose of this study was to analyze toddlers' verbal and nonverbal interaction with their peers and caregivers according to the class size of child care centers in Seoul. The subjects of this study were 20, two-year-old(M=32.5 month) toddlers with peers and caregivers from child care centers in different class sizes, but with same caregiver-toddler ratio. Verbal and nonverbal interactions were videotaped during one hour indoor free play per child in the center. According to the class size, the results were as follows : 1) Toddlers in the small class played more cooperatively with peers, and uttered more regulative or directive words than those in the large class. 2) Toddlers in the large class were more aggressive than those in the small class. 3) Caregivers in small class expressed more empathetic behaviors to a toddler than those in large class.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.47 no.4
• /
• pp.31-37
• /
• 2010

In this paper, highly efficient dual-band class-F power amplifiers(PAs) for cellular and WLAN bands are suggested and implemented. For the first step, single-band class-F amplifiers at 840MHz, 2.4GHz are designed using commercial E-pHEMT FETs. The performance of two single band PAs are as much as 81.2% of efficiency with the output power of 24.4dBm with 840MHz PA and 93.5% of efficiency with 22.4dBm from the 2.4GHz. For the dual-band class-F PA, the harmonic controlling circuit with ideal SPDT switch was suggested. The length of transmission line is variable by a SPDT switch. As a results, the operation in 840MHz showed the peak efficiency of 60.5% with 23.5dBm, while in 2.4GHz mode the efficiency was 50.9% with the output power of 19.62dBm. Besides, it is shown that the harmonic controller of class-F above 2Ghz could be implemented on the low cost FR-4 substrate.

• The Journal of Pediatrics of Korean Medicine
• /
• v.29 no.4
• /
• pp.23-28
• /
• 2015

Objectives The purpose of this study is to examine the development of PBL Module and the possibility of the evaluation on the Korean medical Pediatrics class. Methods In this study, we examined the 32 case reports (four teams for three years) which were made by the Korean medicine school $4^{th}$ year students, who attended the discussion class. The student read the given materials and identified the purpose of the subjects and selected the learning issues, investigated them. After then they discussed the subjects and made the reports. Results The learning issues by students were similar, the students worked to study them with research papers, books, internet materials and personal subjects. After class, the students showed the change of their thoughts and they could accept the other one. Conclusions This study suggests it is possible that the development of PBL Module and the evaluation on the Korean medical Pediatrics Class.

• Journal of Fashion Business
• /
• v.13 no.2
• /
• pp.78-86
• /
• 2009

When scouring and contraction finishing at $90^{\circ}C$ using Relaxer or Rotary Washer contraction and weight loss ratio in warp and weft directions were excellent. Also surface state of fabric after drying or sanding treatment was excellent without crease. Low melting polyester fabric showed a complete melting bond by heat setting(P/S) at above $160^{\circ}C$. The alkali hydrolysis reaction of polyester showed the breakpoint in the weight loss behavior test, polyester yarn showed a breakpoint ranging from 25% to 28%. This is due to the difference of the hydrolysis rate between regular polyester and soluble polyester. Initially the soluble polyester was eluted and micro-fibrillized 5 times faster than a regular polyester. At a later time, a regular polyester was reduced weight to impart a proper flexibility and drape property to the fabric. As a result of surface sanding finishing, the surface of interior fabric showed a surface state most stabilized when using Mesh No. 220 in mono 0.2d after elution finishing. When the rotation direction of sanding roller was pro-, pro-, pro-, and retro-direction, a directional effect of tuft was not shown, a writing effect as suede was exhibited and a surface state was even. Sublimation fastness was 3-4 class for polyester and 2-4 class for nylon. Light fastness 3-4 class after lapse of 100 hours and 2-4 class after lapse of 160 hours. Abrasion fastness was 3-4 class on wet and 4-5 class on dry Laundry fastness was 2-4 class. As such, the abrasion fastness is slightly reduced upon wetting and the use thereof for interior is excellent, whereas laundry fastness is slightly lowered.

• Bulletin of the Korean Mathematical Society
• /
• v.50 no.4
• /
• pp.1297-1302
• /
• 2013

We prove that the mapping class group of a non-Haken orientable irreducible 3-manifold is finite and we show that the quotient group of the mapping class group by the rotation group is virtually torsion-free if the manifold does not have 2-sphere boundary components.

• Journal of the Korean Mathematical Society
• /
• v.50 no.4
• /
• pp.847-864
• /
• 2013

By a change of variables we obtain new $y$-coordinates of elliptic curves. Utilizing these $y$-coordinates as meromorphic modular functions, together with the elliptic modular function, we generate the fields of meromorphic modular functions. Furthermore, by means of the special values of the $y$-coordinates, we construct the ray class fields over imaginary quadratic fields as well as normal bases of these ray class fields.

• Bulletin of the Korean Mathematical Society
• /
• v.43 no.4
• /
• pp.747-753
• /
• 2006

We say operators A, B on Hilbert space satisfy Fuglede-Putnam theorem if AX = X B for some X implies $A^*X=XB^*$. We show that if either (1) A is p-hyponormal and $B^*$ is a class y operator or (2) A is a class y operator and $B^*$ is p-hyponormal, then A, B satisfy Fuglede-Putnam theorem.

• The korean journal of orthodontics
• /
• v.18 no.1 s.25
• /
• pp.209-216
• /
• 1988

The purpose of this study was to verify the class I molar relationship in skeletal class II and class II molar relationship in skeletal clan I malocclusion with unilateral class II, division 1 malocclusion. The sample consisted of lateral cephalometric radiographs and upper and lower dental casts of 30 unilateral class II, division 1 malocclusion. The results of this study were as follows: 1. Skeletal class I malocclusion was $43\%$, and skeletal class II malocclusion was $57\%$ in 30 cases of unilateral class II, division 1 malocclusion. 2. In the skeletal class II with unilateral class II, division 1 malocclusion, mandibular first molar on the class I side showed more mesial migration than the opposite side. 3. In the skeletal class I with unilateral class II, division 1 malocclusion, maxillary first molar on the class II side showed more mesial migration than the opposite side. 4. Midline deviation of upper or lower dental arch was $90\%$ in 30 cases of unilateral class II, division 1 malocclusion.

• Journal of the Korean Applied Science and Technology
• /
• v.36 no.4
• /
• pp.1460-1471
• /
• 2019

This study applied the PBL class to the 'Nursing Process and Critical Thinking' courses in the second semester of 2018, and is a primitive research that utilized a single-group, pretest-posttest experimental design in order to examine the effects of the class on Critical Thinking Disposition, Problem Solving Ability, and Professional Self-Concept. Self-report questionnaires were administered to 59 nursing college students in G province. The PBL class consisted of 8 weeks of traditional lectures and 4 weeks of PBL classes. The SPSS/WIN 23.0 program was used for data analysis. Frequency and percentage were used to analyze the general characteristics, and mean, standard deviation and paired t-test were used to analyze the difference between the two groups. As a result, the Critical thinking Disposition of nursing college students was significantly increased(t=4.39, p<.001) after PBL class(3.71±.36) than before PBL class(3.41±.40). The Problem Solving Ability was notably improved(t=3.97, p<.001) after PBL class(3.70±.59) than before PBL class(3.36±.38). The Professional Self-Concept was considerably increased(t=4.84, p<.001) after PBL class(3.22±.50) compared to before PBL class(2.92±.28). Therefore, applying Problem-Based Learning in nursing education to a greater extent is estimated to be effective in increasing the core competencies of nursing college students.