• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.703-706
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• 2005

This study is analyzed mechanical properties and durability of pavement of a road permeability porous concrete to mix polymer for the enhance of porous concrete of performance and durability. As a result, void ratio showed the tendency which the mixing rate of polymer is decreased a little as increased. And, the influence of void ratio according to the kind of polymer has the difference, but void ratio showed the tendency which the mixing rate of polymer is decreased a little as increased. Compressive strength showed the tendency which the mixing rate of polymer is increased a little as increased. but, it showed the tendency to be reduced rather when above $20\%$ it mixed polymer mixing rate $10\%$ at apex.

• Journal of Information Display
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• 제7권4호
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• pp.1-4
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• 2006

The optical performances of rounded prism films were investigated using a ray tracing technique. The angular distribution of the luminous intensity was obtained as functions of the prism pitch and the curvature of rounded apex and valley of prism arrays. The gain of the on-axis luminance decreased with decreasing curvature (increasing diameter) and pitch. The existence of the curved area on the prism film decreased the recycling efficiency of the prism film, i.e., the rays which would otherwise have been recycled through total internal reflections via the prism surfaces were refracted on the curved regions and redirected toward directions other than the on-axis direction. Quantitative correlation between the luminance gain and the curvature in addition to the prism pitch was obtained, which might serve as basic data for the optimization of prism films and the manufacturing processes.

• 대한치과교정학회지
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• 제9권1호
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• pp.111-115
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• 1979

The author intended to observe the developmental pattern in mandibular bone and condyle following the loss of function of molar with 5 week-old rats b y means of removing the crown of molar. The bjects were observed everyweek during six weeks. The results were as follows ; 1. Bone apposition was observed at the root apex and interadicular area of alveolar bone. 2. Development of bone substance in mandible tended to increase in the narrow bone trabeculae and fibrous bone substance. 3. Development of condylar head showed little difference from that of control group and development of calcified zone appeared more or less poorly.

• 대한치과의사협회지
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• 제18권9호통권136호
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• pp.739-745
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• 1980

The histologic responses of periapical tissues to root canal fillings with Grossman sealer were studied 10 dogs. Root canal fillings were performed on the 20 lower and upper teeth. The animals were sacrificed 1,2,3,4 and 5 weeks after the completion of operation. The following results were based on histopathologic studies; 1) After 1 week, the necrosis of dentin and cementum surrounding root apex was found in the root canal fillings. 2) After 2 weeks, the necrosis of cementum and surrounding alveolar bone were revealed. The resorption of dentin was appeared partially. 3) After 2 weeks, newly formed dentin was appeared surrounding necrotic dentin. 4) After 4-5 weeks, the osteoblastic activity was revealed abundantly surrounding the alveolar bone. 5) Fibrosis was prominantly appeared surrounding over-filled area, and fibrous encapsulation was performed.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.83-86
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• 2003

In this paper, we propose a new hardware architecture for integer transform, quantizer operation of a new video coding standard H.264/JVT. We describe the algorithm to derive hardware architecture emphasizing the importance of area for low cost and low power consumption. The proposed architecture has been verified by PCI-interfaced emulation board using APEX-II Altera FPGA and also by ASIC synthesis using Samsung 0.18 ${\mu}{\textrm}{m}$ CMOS cell library. The ASIC synthesis result shows that the proposed hardware can operate at 100 MHz, processing more than 1, 300 QCIF video frames per second. The hardware is going to be used as a core module when implementing a complete H.264 video encoder/decoder ASIC for real-time multimedia application.

• 대한전자공학회논문지
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• 제11권2호
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• pp.27-32
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• 1974

전방향성을 가지는 다소선으로 만들어진 Biconical Antenna의 특성 임피던스식을 해석적으로 구하고, 이식에 의하여 소선수의 변화가 특성 임피던스에 미치는 영향을 고찰하였다. 이 식은 매우 복잡한 형태를하고, 있으나 정각이 40°보다 작다고 하였을 때 얻어지는 근사식은 매우 간단해지며 이것이 바로 Shelkunoff의 식과 일치함을 볼 수 있었다. 그러나 상기 엄밀식과 근사식에 의한 특성 임피던스의 전자계산치를 비교 분석한 결과 항각이 70° 이하인 범위에서는 양자의 차가 별로 크지 않았으므로 정각이 70°보다 작은 범위에서는 상기의 근사식을 적용할 수 있는 것으로 생각한다.

• 치과방사선
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• 제21권1호
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• pp.83-89
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• 1991

This study was performed to simulate various sizes of periapical lesions and condensing osteitis in bone and to clarify that condensing osteitis would give a greater radiographic contrast because of the more radiopacity immediately adjacent to the lesion and what the lamina dura on radiogram is in bone. For this study, two dry and wet human adult mandible and a cadaver were used. Each mandible was sectioned longitudinally to split lingual and buccal cortical plates to gain better access to the apex of tooth. Lesions were gradually enlarged and bordered with tooth ash that burned out at 950℃ for the reproduction of condensing osteitis in sequence. The serial radiograms were taken under the constantly maintained condition and compared with the actual lesions.

• 대한소아치과학회지
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• 제24권3호
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• pp.710-717
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• 1997

Autotransplantation is the transplantation of embeded, impacted, or unerupted tooth, into extraction socket or surgically prepared socket in the same individual. Clinically, successful autotransplantation must show radiolucent space(periodontal ligament space) between transplanted tooth and supporting bone, lamina dura, no root resorption, no ankylosis, no inflammatory change, and physiologic tooth mobility. It is important that procedure is atraumatic, and the instruments should not contact the root surface during procedure. We performed autotransplantation of impacted mandibular canine that transversely located beneath the apices of the mandibular incisors with uncompletely developed apex. In radiographs and clinical evaluation, this transplant showed successful clinical finding except irregularity of mesial root surface after 14 months. It is conclued that transplantation of canine with $\frac{1}{2}{\sim}\frac{3}{4}$ root development provides a good chance of pulp survival, limited risk of root resorption and ensures sufficient final length, and is thus recommended.

• Animal cells and systems
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• 제6권1호
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• pp.35-40
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• 2002

Two species of the genus Burmoniscus Collinge, 1914 (Philosciidae), B. philippinensis and B palawanensis from Palawan Island, the Philippines are described as new. In the family Philosciidae, only a single species, Pseudo-typhloscia alba (Dollfus, 1898), has been recorded from the Philippines. Two species of the genus Burmoniscus Collinge, 1914 (Philosciidae), B. philippinensis and B. palawanensis from Palawan Island, the Philippines are described as new. B. philippinensis is distinguished from its congeners by the shape of telson with straight sides and slightly protruding distal part with acute apex, while B. palawanensis by its peculiar shape of male pleopod 1 endopod.

• The Plant Pathology Journal
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• 제23권3호
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• pp.210-211
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• 2007

Dactylella pseudoclavata that captures nematodes in adhesive networks was isolated from nematode-infested strawberry plants from Andong, Korea. It produces obclavate, 0-1 septate conidia, $30-40{\mu}m$ long and $8-11{\mu}m$ wide, with round distal ends and bases shaped like bottle-necks. The conidiophores were simple, occasionally branched, $150-300{\mu}m$ long, producing 1-4 conidia at the apex. Chlamydospores were abundant, intercalary or catenulate, yellowish to brown, globate or subglobate, wart on the surface, $30-35{\times}25-30{\mu}m$ in size. This is the first report of Dactylella pseudoclavata in Korea.