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광도 변화가 광중합형 컴포머와 컴포짓트 레진의 중합도 및 불소 유출에 주는 영향
최재윤,이해형,임범순,이용근,신현철 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4
The purpose of this study was to investigate the fluoride releasing behavior of one self-curing glass-ionomer (Fuji II), one light-curing glass-ionomer (Fuji II LC), three compomers (PrismaFlow, UniFil F, and Dyract AP) and SIX composite resins (Flowline, Fissurit FX, Flow-It, Wave, Heliomolar Flow, and Glacier) as a function of light intensity. Disk type specimens were stored in deionized water at 37℃ for 1, 2, 4, 8 hrs and 1, 2, 7, 14, 21, 28 days. The deionized water was changed after measurements. The amount of fluoride ion, which was released from specimens, was measured by pH/ISE Meter (Istek Model 730P, Korea) with fluoride electrode. The results were statistically compared by Tukey multiple comparisons test (p=0.05). There were significant differences in degree of polymerization between specimens with 1 hr after irradiation and those with 24 hrs after irradiation (p<0.05). The cumulative amount of fluoride released was decreased with increasing light intensity (or degree of polymerization). The fluoride-releasing patterns of specimens were significantly different (p<0.05).
김재영,이민우,김진국,한창준,남태욱,임채형 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-
Background and Objectives : Epistaxis is a common disease from which approximately 10% of the normal population have suffered in their life. Most bleeding sites of epistaxis are located anteriorly and easily controlled. However posterior epistaxis presents significantly great problems. A number of different treatment modalities are used to control the posterior epistaxis. Although not widely practiced, the nasal endoscopic electrocautery has also been effective. The purpose of this article is to report on the efficacy of nasal endoscopic electrocautery as an alternative and adjuvant to the standard approach for control of posterior epistaxis. Materials and Methods: We conducted retrospective chart review about 19 cases of posterior epistaxis treated from January 1998 to December 1999. Group I patients were managed by nasal packing only and group II patients were managed by nasal packing and endoscopic electrocautery. Results: Hospital days were 5.9 days in the group I and 3.6 days in the group II. The duration of nasal packing was 4.1 days in the group I and 1.8 days in the group II. The results were significant statistically Conclusion: Nasal endoscopic electrocautery was an effective treatment modality for control of posterior epistaxis.
이재훈,김형국,조경연,임동욱,민형복 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.2
Since testing of digital circuit is becoming increasingly important, many methodologies have been introduced to enhance design for testability (DFT). DFT was taken into account in the automated test procedure and improved reliability of the design. Both tasks are well suited for scan rule checker. This paper presents a scan rule checker for gate level digital circuits. The scan rule checker deals with basic rule check, basic scan rule check, muxed scan rule check, clocked scan rule check and lssd. Scan design informations were represented in the configuration file and libraries were modeled for the scan rule checker. It is an efficient way for the design for testability methodology.
김진국,남태욱,임채형,김재영,김정석 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-
Traditional surgical approaches to orbital medial wall fractures are either extraocular skin incision or indirect bicoronal flap. However these methods can leave remarkable orbital scar or scalp alopecia with possible complications. Endoscopic intranasal visualization of the medial orbital wall and lamina papyracea is a technique familar to otolaryngologists. This endoscopic view allows confirmation of fracture of medial orbital wall and herniation of orbital contents. Good visualization of the fracture can facilitate the anatomic reduction of orbital contents and the proper placement of orbital implant. Two cases of medial orbital wall fracture repaired by intranasal endoscopy using silastic sheet are reported.
Trends and Aspects of South Korean Public Disputes in the Four Governments
( Jae Hyoung Lim ),( Sangjoon Ka ),( Sooncheol An ),( Gang Min Kim ) 한국행정연구원 2015 韓國行政硏究 Vol.2015 No.-
This research aims to examine the characteristics of the public disputes under each South Korean government, and to determine if the general characteristics appeared during each president`s term. In particular, its chief goal was to determine whether public disputes took place, while showing the common characteristics or the distinct trends for each and every government. The research found that while labor-management disputes have most frequently occurred, both regional and class disputes have gone up at an exploding pace of late. In addition, the examination of the public disputes in South Korea by administration led to the conclusion that while the regional disputes relatively rose, the labor-management disputes dropped. As a result, South Korea displays a trend in which the disputes in the private sector have decreased but those in the public sector have increased. A comprehensive look at the past 20 years during which the four South Korean governments took office will reveal that huge changes in the nature of the public disputes occurred. While labor-management disputes, a one-time source of chronic troubles in South Korea, still severely plague the society, both the class and regional disputes additionally appeared to have gotten worse, transforming the landscape of the public disputes in the country. The fact that the occurrence of the two aforementioned kinds of disputes has skyrocketed indicates that South Korea may soon find itself in an age in which all the public disputes in the country are either class or regional disputes as the occurrence of these two kinds of disputes is expected to surpass the occurrence of labor-management disputes in the near future. On the other hand, the rise of ideological disputes was not found to be increasing in speed, but it is not an exaggeration to say that ideological disputes have the potential of becoming a huge social issue in the future considering that ideological confrontations still run high under a variety of public disputes. This research can be seen as meaningful in that it analyzed the South Korean public disputes by government and term, figuring out the critical characteristics in the trends and occurrences of public disputes in South Korea.
( Jae Young Cho ),( Jae Joong Lee ),( Sung Hun Park ),( Hyung Joon Joo ),( Jae Hyoung Park ),( Chul Min Ahn ),( Soon Jun Hong ),( Do Sun Lim ) 대한내과학회 2013 대한내과학회 추계학술대회 Vol.2013 No.1
Background: Angiotensin receptor blockers (ARBs) are known for its anti-inflammatory and anti-proliferative effects. The aim of the study was to evaluate long-term effects of ARBs on morphologic characteristics of stent restenosis in patients with coronary artery disease requiring stent implantation by optical coherence tomography (OCT). Methods: Patients with coronary artery disease having history of drug-eluting stent implantation (n=407) were analyzed on the basis of ARB therapy as the ARB group (n=162) and the non-ARB group (n=245). Neointimal characterizations were performed at lesions with diameter stenosis >30% with OCT in each group. Major adverse cardiovascular events (MACEs), lumen area, stent area, neointimal area, neointimal thickness, nonapposed struts, uncovered struts, and intraluminal mass between two groups were also observed. Results: More patients in the ARB group revealed homogenous and layered neointimal pattern (44.9% vs. 35.6%, p<0.001, and 16.8% vs. 10.6%, p<0.001, respectively), and whereas patients in the non-ARB group revealed heterogeneous neointimal pattern (1.1% vs. 7.6%, p<0.001). Mean neointimal area (1.09±1.00mm2 vs. 1.38±1.24mm2) and mean neointimal thickness (140.6±112.0 μm vs. 189.6±423.1μm) with OCT were smaller in the ARB group when compared to the non-ARB group. Percentage of covered stents was significantly higher in the ARB group when compared to the Non-ARB group (97.3% vs. 92.6%, p=0.015). Other factors such as follow-up % diameter stenosis, late lumen loss, binary restenosis, MACEs, various neointimal characteristics analyzed by image analyzing software did not show significant differences. Conclusion: The use of ARBs after drug-eluting stent implantation demonstrated change in neointimal characteristics and stent struts were covered more likely during the follow-up OCT, indicating the anti-inflammatory effects of ARBs.
Lim, Hyoung Jun,Choi, Hoil,Yoon, Sang-Jae,Lim, Sang Won,Choi, Chi-Hoon,Yun, Gun Jin Techno-Press 2021 Composite materials and engineering Vol.3 No.3
This paper presents a multiscale modeling method for sheet molding compound (SMC) composites through a novel bundle packing reconstruction algorithm based on a micro-CT (Computed Tomography) image processing. Due to the complex flow pattern during the compression molding process, the SMC composites show a spatially varying orientation and overlapping of fiber bundles. Therefore, significant inhomogeneity and anisotropy are commonly observed and pose a tremendous challenge to predicting SMC composites' properties. For high-fidelity modeling of the SMC composites, the statistical distributions for the fiber orientation and local volume fraction are characterized from micro-CT images of real SMC composites. After that, a novel bundle packing reconstruction algorithm for a high-fidelity SMC model is proposed by considering the statistical distributions. A method for evaluating specimen level's strength and stiffness is also proposed from a set of high-fidelity SMC models. Finally, the proposed multiscale modeling methodology is experimentally validated through a tensile test.