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RISS 인기검색어
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- 저자 : 최용석,남윤규,박덕기,황인수,최광렬 (검색결과 1,543 건)
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온도센서용 (1-x)La0.7Sr0.3MnO3-xBaTiO3 세라믹스의 구조적, 전기적 특성
최용석,김영곤,이성갑 한국전기전자재료학회 2025 전기전자재료학회논문지 Vol.38 No.4
The composite specimens of (1-x)(La0.7Sr0.3)MnO3-xBaTiO3 (x = 0.05 ~ 0.3) were synthesized using the conventional solid-state reaction method, and the sintering temperature and time were 1,300℃ and 3 hours, respectively. As a result of observing the structural characteristics, the crystal structure of LSMO-BT solid solution was shown in which the rhombohedral LSMO phase and the tetragonal BT phase were separated and distributed, respectively. And fine grains having relatively small and uniformly distributed grains with sizes ranging from approximately 0.4 to 0.5 μm and pores within the specimens were observed. Notably, variations in the BT content did not significantly affect the grain size or porosity distribution, and a relative density of about 90% or more was shown. The resistivity, temperature coefficient of resistance (TCR), and B25/65-value of the 0.7LSMO-0.3BT specimen at room temperature showed the highest values of 1.94 Ω-cm, 0.292 %/℃, and 464 K, respectively. The resistivity behavior of the LSMO–BT composites matched well with the small polaron hopping conduction model.
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최용석,김규태,황의환 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.36 No.3
The use of computed tomography for dental procedures has increased recently. Cone beam computed tomography (CBCT) systems have been designed for imaging hard tissues of the dentomaxillofacial region. CBCT is capable of providing high resolution in images of high diagnostic quality. This technology allows for 3-dimensional representation of the dentomaxillofacial skeleton with minimal distortion, but at lower equipment cost, simpler image acquisition and lower patient dose. Because this technology produces images with isotropic sub-millimeter spatial resolution, it is ideally suited for dedicated dentomaxillofacial imaging. In this paper, we provide a brief overview of cone beam scanning technology and compare it with the fan beam scanning used in conventional CT and the basic principles of currently available CBCT systems.
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측두하악관절 장애 환자의 임상증상과 자기공명영상에 관한 비교 연구
최용석,황의환,이상래,Choi Yong-Suk,Hwang Eui-Hwan,Lee Sang-Rae 대한영상치의학회 2003 Imaging Science in Dentistry Vol.33 No.2
Purpose : To determine the relationship between clinical symptoms and magnetic resoncance (MR) images in patients presenting with temoporomandibular joint (TMJ) disorders. Materials and Methods: This study was based on 172 joints in 86 patients presenting with TMJ disorders. Joint pain and sound during jaw opening and closing movements were recorded, and the possible relationship between disc positions and bony changes of the condylar head and the articular fossa in MR images in the oblique sagittal planes were examined. Data were analyzed by Chi-square test. Results : There was no statistically significant relationship between clinical symptoms and MR images in the patients with TMJ disorders. Conclusion: In the patient with TMJ disorders, joint pain and sound could not be specific clinical symptoms that are related with MR image findings, and asymptomatic joints did not necessarily imply that the joints are normal according to MR image findings.
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이하선에 발생된 양성 혼합종에서 유래된 암종의 증례보고
최용석,황의환,이상래 대한구강악안면방사선학회 2000 Imaging Science in Dentistry Vol.30 No.1
Carcinoma ex mixed tumor is a mixed tumor in which a second neoplasm develops from the epithelial component that fulfills the criteria for malignancy. This tumor occurs frequently in the parotid glands. Individuals in whom carcinoma ex mixed tumor have a past history of benign mixed tumor. These lesions contain both a benign mixed tumor as well as a malignant neoplasm. We report a case of carcinoma ex mitred tumor which occurred in the parotid gland. A 67-year-old woman presented with movable right mass. she complained pain and facial paralysis. The clinical presentation, several diagnostic images, and histopathologic findings are presented. (Korean J Oral maxillofac Radiol 2000; 30: 92-99)
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