• Journal of the korean academy of Pediatric Dentistry
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• v.33 no.4
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• pp.722-727
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• 2006

Most of impacted teeth reported are permanent teeth. Impaction of primary tooth caused by primary failure of eruption is rare and the most of impacted primary tooth are second primary molars. The etiology of a primary molar impaction would appear to be a physical barrier, early ankylosis of the tooth, abnormal development of the primary molar germ or malposition of the successor bud. Transposition has been described as an interchange in the position of two teeth within the same quadrant of the dental arch. It is most commonly seen with canine and lateral incisor teeth, but is rarely associated with the primary dentition. The two cases show the transposition of impacted primary molar and the tooth germ of second premolar in their clinical and radiographic examinations. In case 1, lower second primary molar was deeply impacted inferiorly to the tooth germ suspected to be a second premolar. In case 2, impacted all second primary molars were positioned inferiorly to the tooth germs suspected to be the successors. We extracted all second primary molars under general anesthesia and the extracted tooth germs appeared to be second premolars.

• Life and Agrochemicals
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• v.27 no.7 s.220
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• pp.26-29
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• 2006

최근 올바른 이해 없이 만능인양 확산됨으로써 소비자들은 친환경농업에 대한 막연한 환상과 기대를 가지고 있는 듯 하다. 그러면서 유구한 역사와 함께 하며 포식의 시대를 유인해 온 십중팔구의 관행농업에 대해서는 막연한 불안과 몹쓸 것인 양 고운눈길을 주지 않으려 한다. 불행한 현실이다. 이런 즈음에 친환경농업의 현 주소를 심도 있게 조명, 허와 실을 알게 해준 보도가 있어 눈길을 끈다. 이번 호부터 매일경제신문에 보도된「유기농 대해부」시리즈를 전재코자 한다. 친환경농업이 무엇 때문에 가능하고 얼마나 어려우며 유통현실이 어떠한가에 대한 많은 이해가 있기를 바란다

• 대학교육
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• s.150
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• pp.46-51
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• 2007

영국의 고등교육개혁은 유구한 역사를 통하여 형성된 고등교육의 전통을 직접 자극하지 않으면서, 급격한 변화보다는 특정 부문에 대한 성과를 높이는 방향으로 꾸준히 진행되어왔다. 크게 엘리트교육을 탈피한 대중화교육의 지향, 대학교육의 양적 팽창과 비례한 대학교육의 질 제고, 실용성과 융화된 대학교육, 국가 수준의 고등교육제도의 개혁을 중심으로 이루어져왔다고 할 수 있다. 정부의 정책적 의지에 따라 각 대학들도 조직차원에서의 구조개혁을 통한 특성화를 모색하고 있는데, 여기서는 대학특성화를 중심으로 영국의 고등교육개혁 동향을 살펴보고자 한다.

• Journal of the korean academy of Pediatric Dentistry
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• v.32 no.4
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• pp.628-633
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• 2005

Deep caries in primary molars without early intervention frequently induce a pulpal disease and consequent furcation lesion with fistulous openings Up to now, majority of the textbooks on pediatric dentistry and literatures have described that extraction of the inflicted teeth is indicated for these cases and in reality these teeth have usually been extracted in the dental clinics. However when we recognize the excellent capacity of bone regeneration in children and the presence of numerous accessory canals at furcation areas, the removal of infection source in pulp by pulpectomy and inflammatory granulation tissues at furcation areas by furcal curettage might open the possibility of rapid healing at the furcation regions. In this report, 10 cases of primary molars in 3 to 6-year-old children with fistulous openings and furcation lesions in moderate size of 2 to 4mm in depth radiolucency at furcation lesion have been chosen. After pulpectomy and furcal curettage, evident bone regeneration was detected radiographically in all cases. Through the cases, we came to realize that all the cases previously described are not the indications of extraction and this approach could make many cases with pulp and furca combined lesions survive and remain healthy in the children's dental arches. However, in order for this approach to acquire objective appropriateness, it is thought that more scrupulous evaluation is desirable on the various factors regarding the indication such as the extent of furcation lesions, absorption status of teeth, amount of covering bone on succeeding teeth and so on.

• Journal of the korean academy of Pediatric Dentistry
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• v.47 no.1
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• pp.36-43
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• 2020

The aim of this study was to assess the occlusal relationships of primary dentition of Korean preschool children in Hwaseong city. Total 444 children of age group between 2 and 5 years were selected. One pediatric dentist took intraoral photos of children. Evaluation and categorization of the primary molar relationships were done by single examiner. Statistical analysis was performed with Pearson chi-squared test. Total 389 samples, which is consisted of 185 boys, 204 girls were satisfied with inclusion criteria. Bilateral mesial step was seen in 61.7%. Bilateral flush terminal plane was seen in 15.4%. When the primary molar relations of the right and left sides were not the same, the combination of the mesial step and flush terminal plane was 14.7%. The present study provides insight into occlusal relationships in the primary dentition of 2 - 5 years old of Korean children in Hwaseong city. Pediatric dentists should understand occlusal relationships of primary dentition for establishment of appropriate treatment strategies and occlusal guidance.

• Journal of the korean academy of Pediatric Dentistry
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• v.31 no.4
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• pp.701-704
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• 2004

In this case, we would like to discuss about the single rooted deciduous mandibular first molar. The deciduous mandibular molar of a five years old boy was shown to have a single root, bilaterally. Ordinarily, the maxilary molars have three roots and the mandibular molars have two roots. However, when the hertwig's epithelial root sheath do not invaginate properly during tooth development, root fusion can occur from the absence of root separation. Molars with fused roots not only have unfavorable crown to root ratio, but also according to many reports, have higher probability of having multiple congenitally missing teeth or dens invaginatus in the maxillary incisors, consequently requiring preventive dental treatment In addition, disorders such as ectodermal dysplasia, syndactyly, clinodactyly, bluish sclera can also be related to this condition. Root fusion is known to be of autosomal recessive inheritance. Up to date, single rooted molars have been reported several times in permanent dentitions but hardly in deciduous dentition, which is the motive for this paper.

• Economic and Environmental Geology
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• v.57 no.2
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• pp.253-261
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• 2024

Olivine, a major mineral in the upper mantle with strong intrinsic elastic anisotropy, plays a crucial role in seismic anisotropy in the mantle, primarily through its lattice preferred orientation (LPO). Despite this, the influence of the microstructure of mylonitic rocks on seismic anisotropy remains inadequately understood. Notably, there is a current research gap concerning seismic anisotropy directly inferred from mylonitic peridotite massifs in Korea. In this study, we introduce the deformation microstructure and LPO of olivine in the mantle shear zone. We calculate the characteristics of seismic anisotropy based on the degree of deformation (proto-mylonite, mylonite, ultra-mylonite) and establish correlations between these characteristics. Our findings reveal that the seismic anisotropy resulting from the olivine LPO in the ultra-mylonitic rock appears to be the weakest, whereas the seismic anisotropy resulting from the olivine LPO in the proto-mylonitic rock appears to be the strongest. The results demonstrate a gradual decrease in seismic anisotropy as the fabric strength (J-index) of olivine LPO diminishes, irrespective of the specific pattern of olivine's LPO. Moreover, all samples exhibit a polarization direction of the fast S-wave aligned subparallel to the lineation. This suggests that seismic anisotropy originating from olivine in mylonitic peridotites is primarily influenced by fabric strength rather than LPO type. Considering these distinctive characteristics of seismic anisotropy is expected to facilitate comparisons and interpretations of the internal mantle structure and seismic data in the Yugu area, Gyeonggi Massif.

• Proceedings of the Korea Contents Association Conference
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• 2014.11a
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• pp.127-128
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• 2014

본 연구에서는 정원 관련 저술서인 장물지와 임원경제지를 통해 한 중의 정원문화 특성을 도출하고 그 관계성을 고찰한 결과, 장물지와 임원경제지는 방대한 양의 자료수집을 통한 정원문화 집대성이라는 측면에서 높은 가치를 지니고 있었으며 입지, 건조물, 수목식재, 수경요소, 동물의 사육 등 공통적으로 나타나는 부분이 다수 나타나는 점은 각각의 정원문화에 있어 영향관계가 성립했을 것으로 보인다.

• Journal of the Mineralogical Society of Korea
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• v.18 no.3 s.45
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• pp.195-204
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• 2005

Interlayered structures of talc and chlorite in the talc deposits of the Yugu area are studied using transmission electron microscope. Packets of chlorite-like layer in talcs or packets of talc-like layer in chlorites are commonly observed. Randomly interlayered features of talc and chlorite are locally observed in some specimens. Reactions observed in the present study include the addition or removal of a brucite-like layer in the interlayer region of the talc or chlorite resulting in the , transformation between a talc and a chlorite layers and breakdown or formation of a talc-like layer resulting in transformation between two talc layer and one chlorite layer. Both reactions are accompanied by a significant change in volume. In addition to these mechanisms, there are two volume conserving mechanisms; the combination of both mechanisms and mutual transformation in a complex manner. Reactions from 2 chlorite layers to 3 talc layers, from 2 chlorite layers + 1 talc layers to 1 chlorite layers + 3 talc layers, and from 3 chlorite layers to 5 talc layers are observed among the complex type mechanisms.

• Journal of Korean Medical classics
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• v.36 no.4
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• pp.25-40
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• 2023

Objectives : This paper studies the Tangaek-Unhoei(湯液韻彙) index of herbal medicine in the Inje-Ji(仁濟志) of the Imwon-Gyeongje-Ji(林園經濟志), which contains about 4,800 formulas. Created by 19th-century Joseon scholar Seo, Yugu, it not only lists the formulas according to their names, but also provides index by topic, which enabled the collection and effective application of massive medical information. Methods : We quantitatively examined the nearly 4,800 herbal medicines in the Tangaek-Unhoei and their categorization. Any uncommon or particular categorization was examined further by analyzing the original text. Results & Conclusions : The prescriptions contained in the Inje-Ji are categorized under 26 headings. They are listed according to the 106 units of the Chinese character dictionary and organized by double headings. This unique index makes it easy to browse the contents of such a vast book containing massive medicinal knowledge. In addition, the fifty or so remedies called 'Fang(方)' exemplify the author's attitude toward medicinal knowledge, which is both rational and inclusive. This is an attitude that should be recognized beyond tradition.