• Animal cells and systems
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• 제1권3호
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• pp.419-423
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• 1997

Two new marine tardigrades, florarctus kwoni n. sp. and Batillipes philippinensis n. sp. belonging to Halechiniscidae and Batillipedidae, respectively, are described on the basis of the specimens sieved from sublittoral coral sands and shell gravels of Palawan Island, the Philippines. florarctus kwoni n. sp. is characterized by the rocket-shaped aliform expansion, with the distal margin of posterior ala flattened. Batillipes philippinensis n. sp. closely resembles B. similis Schulz, 1955 and B. annulatus De Zio, 1962. However, it is clearly discernible from the former by the shape of lateral body projection between leg III and leg IV, and the relative length of cirrus E and the spine on leg IV, and from the latter by the shape of the lateral body projection and the clavar shape. This is the first report of the marine tardigrades from the Philippines.

• 대한치과의사협회지
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• 제21권12호통권175호
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• pp.991-995
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• 1983

A radicular cyst is a slowly-growing epithelial sac lining a pathologic cavity in the bone at the apex of a tooth. Large radicular cyst revealed by radiographic examination almost always appear to involved several teeth. The author observed a 31 year old woman with a labial swelling and palatal mucosal expansion of the maxillary anterior region. Radiographic examination indicated that the lesion extended from the left maxillary lateral incisor to the right lateral incisor. Cyst consisted of tan to gray yellow slightly firm to partly hard plaque like tissue measuring 3.4 x 2.2 x 0.3㎝. The author has treated the cyst by means of enucleation with apicoecomies of the involved teeth except the right central incisor. Recovery proceed satisfactorily and there were no clinical or radiologic signs of recurrence 8 months later.

• 식물분류학회지
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• 제37권4호
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• pp.351-361
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• 2007

In angiosperms, leaves typically develop as three-dimensional structure with dorsoventral, longitudinal, and lateral axes. We have shown that the control of two axes of leaves, longitudinal and lateral axis, can be genetically separable, and four classes of genes are responsible for the polar cell expansion and polar cell proliferation in Arabidopsis. In monocots, unifacial leaf, in which leaf surface consists only of abaxial identity, has been evolved in a number of divergent species. The unifacial leaves provide very unique opportunities for the developmental studies of the leaf axes formation in monocots, because their leaf polarities are highly disorganized. In addition, the mechanism of the parallel evolution of such drastic changes in leaf polarities is of interest from an evolutionary viewpoint. In this article, we describe our recent approaches to reveal the mechanism of unifacial leaf development and evolution, including recent advances in the leaf polarity specification in angiosperms.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 봄 학술발표회 논문집
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• pp.460-467
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• 1997

Compared to normal-strength concrete, high-strength concrete has the lower lateral expansion capacity caused by the higher elastic modulus and the lower internal crack characteristic. Therefore, the effect of the lateral confining action of hoops appears slowly and also in inefficient Nevertheless. it has been reported that the strength and deformation capacity of high-strength concrete is improved by well-distributed hoops. Due to that argument, this investigation has been compared and analyzed by the experimental works on the deformation capacity and the confinement mechanism of high-strength concrete shear wall of the high-rise building reinforced by rectangular steel tubes and rectangular hoops at both edges of the shear wall.

• 지구물리와물리탐사
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• 제13권4호
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• pp.315-322
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• 2010

위상막 구조보정과 split-step Fourier 구조보정은 주파수-파수, 주파수-공간 영역에서 단방향 파동방정식을 이용하여 빠른 계산 속도로 수평적 속도변화를 고려할 수 있는 구조보정이다. 일반화된-막(generalized-screen) 구조보정은 주파수-파수영역에서 수직전파를 가정하는 위의 두 구조보정과는 달리 수직전파를 가정하지 않고, 지수함수의 무한급수 전개를 이용한다. 또한 수직느리기항의 테일러 급수전개를 일반화하여 고차항을 추가함으로써 급격한 속도변화를 갖는 지하구조에서 넓은 각으로 전파하는 파동장에 대한 정확도를 향상시켰다. 이 논문은 다양한 경사와 급격한 속도변화를 포함하는 복잡한 지하구조를 효율적으로 보다 정확하게 영상화하기 위하여 2차원 일반화된-막 구조보정에 대하여 연구하였다. 일정한 미소변량(constant perturbation)을 갖는 매질과 SEG/EAGE 암염돔을 모사한 모델에 대하여 일반화된-막 전파자와 위상막 전파자의 전파된 파동장을 비교한 결과, 일반화된-막 전파자가 파동장의 넓은각 전파에 대해 위상막 전파자보다 높은 정확도를 보였다. 또한 일반화된-막 전파자의 차수를 증가시킬수록 넓은 각으로 전파하는 파동장의 정확도가 향상되었다. 큰 수평적 속도변화와 급경사를 갖는 모델과 SEG/EAGE 암염돔 합성 탄성파탐사 자료에 대하여 일반화된-막 구조보정과 위상막 구조보정을 적용한 결과, 일반화된-막 구조보정이 속도변화가 크고 급격한 경사를 갖는 반사면을 보다 정확한 위치에 뚜렷하게 영상화하였다.

• 대한치과교정학회지
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• 제45권2호
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• pp.82-88
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• 2015

Objective: The aim of this study was to evaluate the reliability of measurements obtained after the superimposition of three-dimensional (3D) digital models by comparing them with those obtained from lateral cephalometric radiographs and photocopies of plaster models for the evaluation of upper molar distalization. Methods: Data were collected from plaster models and lateral cephalometric radiographs of 20 Class II patients whose maxillary first molars were distalized with an intraoral distalizer. The posterior movements of the maxillary first molars were evaluated using lateral cephalometric radiographs (group CP), photocopies of plaster models (group PH), and digitized 3D models (group TD). Additionally, distalization and expansion of the other teeth and the degrees of molar rotation were measured in group PH and group TD and compared between the two groups. Results: No significant difference was observed regarding the amount of molar distalization among the three groups. A comparison of the aforementioned parameters between group PH and group TD did not reveal any significant difference. Conclusions: 3D digital models are reliable to assess the results of upper molar distalization and can be considered a valid alternative to conventional measurement methods.

• 대한구순구개열학회지
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• 제10권1호
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• pp.17-22
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• 2007

The vertebrate upper lip forms from initially freely projecting maxillary, medial nasal, and lateral nasal prominences at the rostral and lateral boundaries of the primitive oral cavity. These facial prominences arise during early embryogenesis from ventrally migrating neural crest cells in combination with the head ectoderm and mesoderm and undergo directed growth and expansion around the nasal pits to actively fuse with each other. Initial fusion is between lateral and medial nasal processes and is followed by fusion between maxillary and medial nasal processes. Fusion between these prominences involves active epithelial filopodial and adhering interactions as well as programmed cell death. Slight defects in growth and patterning of the facial mesenchyme or epithelial fusion result in cleft lip with or without cleft palate, the most common and disfiguring craniofacial birth defect. This review will summarize the current understanding of the basic morphogenetic processes and molecular mechanisms underlying upper lip development.

• Steel and Composite Structures
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• 제18권4호
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• pp.1023-1044
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• 2015

Concrete-filled tubes (CFT), formed by an outer steel tube filled with plain or reinforced concrete inside, have been increasingly used these recent decades as columns or beam-columns, especially for tall buildings in seismic areas due to their excellent structural response. This improved behavior is derived from the effect of confinement provided by the tube, since the compressive strength of concrete increases when being subjected to hydrostatic pressure. In circular CFTs under compression, the whole tube is uniformly tensioned due to the radial expansion of concrete. Contrarily, in rectangular and square-shaped CFTs, the lateral flanges become subjected to in-plane bending derived from this volumetric expansion, and this fact implies a reduction of the confinement effect of the core. This study presents a numerical analysis of different configurations of CFT stub columns with inner stiffening plates, limited to the study of the influence of these plates on the compressive behavior without eccentricity. The final purpose is to evaluate the efficiency in terms of strength and ductility of introducing stiffeners into circular and square CFT sections under large deformation axial loading.

• 대한치과의사협회지
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• 제52권5호
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• pp.264-272
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• 2014

Maxillary canine is the most common impacted tooth except third molars. In Asian populations, labial impaction is more common than palatal impaction, but palatal impaction is three times more common than labial impaction in Caucasion. The incidence of maxillary canine impaction is known as 1~3%, and 12% of these cases are involved in the root resorption of the adjacent lateral incisor. In children, early diagnosis is important to prevent the impaction of maxillary canine through clinical and radiographic examinations. In addition, preventive measures should be considered at the proper time. These measures include the removal of deciduous canines and the expansion of the maxillary arch.

• 대한치과보철학회지
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• 제30권3호
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• pp.401-410
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• 1992

The purpose of this study was to investigate the dimensional changes and surface morphology of dentures processed by various polymerization conditions. The measurements were done by taking radiograph and using vernier calipers and each specimen was observed on scanning electron microscope. Results obtained were as follows. 1. The difference of dimensional stability was not recognized between various polymerization conditions(heat-cured resin, pour-type resin, microwave-cured resin, and injection molding resin). 2. There were expansion and shrinkage in the occlusal dimension, shrinkage in the frontal dimension, and expansion in the lateral dimension. 3. Scanning electron microscope pictures of heat-cured resin showed dense and regular surface morphology. 4. Microwave-cured resin surface appeared more regular and smooth than pour-type resin but less dense and more irregular than heat-cured resin. 5. Scanning electron microscope pictures of pour-type resin with the lowest dimensional change showed the most irregular surface morphology.