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Purpose: This study was performed to investigate the clinical usefulness of teleradiology in general dental practice. Materials and Methods: Two hundred and seventy five cases were submitted for inquiry to the case presentation board of the website of The Korean Academy of Oral and Maxillofacial Radiology for a 5 year periods. The diagnosis results of those cases were analyzed according to the disease classification, the correlation with the patient’s chief complaint, the necessity of additional examinations or treatments, the image modalities, and the number of dentists inquiring. Results: Differential diagnoses of normal anatomic structures were the most frequently submitted cases, covering 15.6% of all cases. Among 275 cases, 164 cases required no additional treatments or examinations. Panoramic radiographs were the most frequently submitted images, accounting for 248 inquiries. The 275 cases were submitted by 96 dentists. Fifty-two dentists wrote one inquiry, and 44 inquired 2 or more times. The average inquiry number of the latter group was 5.0 cases. Conclusion: A teleradiology system in general dental practice could be helpful in the differential diagnosis of common lesions and reduce unnecessary costs.
Design of pultruded structural shapes is often governed by the local buckling because the pultruded structural shapes have lowstiffness and also cross-section of structural shapes is composed of plate components such as flange and web. Therefore, it isnecessary to investigate the effects of material properties variations in the cross-section for the local buckling strength because themechanical properties of the material are also a function of the local buckling strength. In this paper, closed-form local bucklinganalysis is conducted on the pultruded Fiber Reinforced Polymer plastic (FRP) I-section structural members under compression. Inthe analysis, mechanical property variations in the cross-section are also taken into account. It is also discussed that how thevariations of material properties in the cross-section affect the local buckling strength of pultruded FRP I-section structural member. The published experimental results are used to validate the analytical results investigated in this study. From the result ofinvestigation, it was found that even though there are significant variations in the material properties in the cross-section of pultrudedFRP I-section members such material properties variations in the cross-section do not affect so much compared with the geometricalvariables, such as width-thickness ratio, in the local buckling strength of the member.
This study aims to investigate the characteristics of the vegetation structure in the sectin stretching between the Jilmoi wetlands and the Donghae Observatory and to set the criteria for the basic data for a management plan including restoration afterwards. 12 plots(10 m×40 m, 20 m×20 m) were set up to analyse the vegetation structure. The analysis of the classification by TWINSPAN and ordination by DCA, importance percentage and property, distribution of diameter of breast height, growth increments of major woody species, species diversity and the physicochemical properties of soil were all analyzed. Vegetation classes were divided into 3 communities, which are community Ⅰ(Pinus densiflora community), community Ⅱ(Quercus mongolica community) and community Ⅲ(Quercus mongolica-Tilia amurensis community). The P. densiflora community declined when competing with Q. mongolica and Fraxinus rhynchophylla and Q. mongolica competed with T. amurensis on an understory layer in Q. mongolica community. Q. mongolica competed with T. amurensis on both canopy and understory layers in Q. mongolica-T. amurensis community. P. densiflora declined and it was assumed to succeed to F. rhynchophylla or T. amurensis through Q. mongolica based on the importance percentage and distribution of the diameter of the breast height of small and middle sized trees. The age of P. densiflora was between 47 to 51 years old and Q. mongolica was 61years old. T. amurensis was 61 years old and the growth of Q. mongolica slowed a little. As the result of Shannon's index of species diversity, community Ⅰranged from 0.9578 to 1.1862, community Ⅱ ranged from 0.7904 to 1.2286 and community Ⅲ ranged from 0.8701 to 1.0323. The contents of organic matter and cation were low compared to uncultivated mountain soil and it were analysed to be inappropriate for tree growth.
Fiber reinforced polymeric plastic (FRP) materials have many advantages over conventional structural materials, i.e., high specific strength and stiffness, high corrosion resistance, right weight, etc. Among the various manufacturing methods, pultrusion process is one of the best choices for the mass production of structural plastic members. Since the major reinforcing fibers are placed along the axial direction of the member, this material isusually considered as an orthotropic material. However, pultruded FRP (PFRP) structural members have low modulus of elasticity and are composed of orthotropic thin plate components the members are prone to buckle. Therefore, stability is an important issue in the design of the pultruded FRP structural members. Many researchers have conducted related studies to publish the design method of FRP structures and recently, referred to the previous researches, pre-standard for LRFD of pultruded FRP structures is presented. In this paper, the accuracy and suitability of design equation for the local buckling strength of pultruded FRP I-shape compression members presented by ASCE are estimated. In the estimation, we compared the results obtained by design equation, closed-form solution, and experiments conducted by previous researches.
이 논문에서는, CFT 감재-콘크리트 합성말뚝과 FRP를 원주방향으로 보강한 FRP-콘크리트 합성말뚝 (CFFT)과 관련하여 발생하는 문제점들을 완하시키기 위해 새롭게 제안된 콘크리트 채움 원형 FRP 말뚝 (HCFFT)의 구조적 거동에 대한 실험적 연구결과를 발표하였다. 연구를 통해 기존의 CFT와 CFFT 말뚝과 비교하여 새로 제안한 HCFFT 말뚝이 말뚝 기초의 시공에서 축하중과 휨모멘트를 포함하는 상부하중을 지반에 효과적으로 전달할 수 있음을 알 수 있었다. In this paper, we persent the results of on experimental investigations pertaining to the structural behavior of new type of concrete filled fiber reinforced plastic circular tubes (i.e., hybrid CFFT, HCFFT) which are suggested in order to mitigate the problems associated with the concrete filled steel-concrete composite tube (CFT) and the concrete filled fiber reinforced plastic tube (CFFT). It is found that when the HCFFT is used in the construction of pile foundation the HCFFT pile can transfer axial as well as flexural loads from the superstructure to the underground effectively in comparison with CFT and CFFT piles.
Purpose: The aim of this study was to evaluate the safety and accuracy of a new portableultrasonography-guided high-intensity focused ultrasound (USg-HIFU) system with a3-dimensional (3D) electronic steering transducer, a simultaneous ablation and imaging module,real-time cavitation monitoring, and 3D image reconstruction algorithms. Methods: To address the accuracy of the transducer, hydrophones in a water chamber wereused to assess the generation of sonic fields. An animal study was also performed in five pigsby ablating in vivo thighs by single-point sonication (n=10) or volume sonication (n=10) andex vivo kidneys by single-point sonication (n=10). Histological and statistical analyses wereperformed. Results: In the hydrophone study, peak voltages were detected within 1.0 mm from the targetson the y- and z-axes and within 2.0-mm intervals along the x-axis (z-axis, direction of ultrasoundpropagation; y- and x-axes, perpendicular to the direction of ultrasound propagation). Twentynineof 30 HIFU sessions successfully created ablations at the target. The in vivo porcine thighstudy showed only a small discrepancy (width, 0.5-1.1 mm; length, 3.0 mm) between theplanning ultrasonograms and the pathological specimens. Inordinate thermal damage wasnot observed in the adjacent tissues or sonic pathways in the in vivo thigh and ex vivo kidneystudies. Conclusion: Our study suggests that this new USg-HIFU system may be a safe and accuratetechnique for ablating soft tissues and encapsulated organs.
Purpose : The purpose of this review is to evaluate the possibility of panoramic radiography as a national oral examination tool. Materials and Methods : This report was carried out by review of the literatures. Results : Panoramic radiography has sufficient diagnostic accuracy in dental caries, periodontal diseases, and other lesions. Also, the effective dose of panoramic radiography is lower than traditional full-mouth periapical radiography. Conclusion : Panoramic radiography will improve the efficacy of dental examination in national oral examination. However, more studies are required to evaluate the benefit, financial cost, and operation time and also to make selection criteria and quality management program.
Objective: To evaluate the usefulness of time-resolved contrast enhanced magnetic resonance angiography (4D MRA) after stent-assisted coil embolization by comparing it with time of flight (TOF)-MRA. Materials and Methods: TOF-MRA and 4D MRA were obtained by 3T MRI in 26 patients treated with stent-assisted coil embolization (Enterprise:Neuroform = 7:19). The qualities of the MRA were rated on a graded scale of 0 to 4. We classified completeness of endovascular treatment into three categories. The degree of quality of visualization of the stented artery was compared between TOF and 4D MRA by the Wilcoxon signed rank test. We used the Mann-Whitney U test for comparing the quality of the visualization of the stented artery according to the stent type in each MRA method. Results: The quality in terms of the visualization of the stented arteries in 4D MRA was significantly superior to that in 3D TOF-MRA, regardless of type of the stent (p < 0.001). The quality of the arteries which were stented with Neuroform was superior to that of the arteries stented with Enterprise in 3D TOF (p < 0.001) and 4D MRA (p = 0.008), respectively. Conclusion: 4D MRA provides a higher quality view of the stented parent arteries when compared with TOF.
Thyroid cancer may have small adipose structures detected by microscopy. However, there are no reports of thyroid cancer with gross fat evaluated by radiological methods. We reported a case of a 58-year-old woman with a fat containing thyroid mass. The mass was hyperechoic and ovoid in shape with a smooth margin on ultrasonography. On computed tomography, the mass had markedly low attenuation suggestive of fat, and fine reticular and thick septa-like structures. The patient underwent a right lobectomy. The mass was finally diagnosed as a follicular variant of papillary thyroid cancer with massive stromal fat.