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NiTi Rotary Instrumentation이 근관만곡도 변화에 미치는 영향
임형태,홍찬의,조용범 大韓齒科保存學會 1998 Restorative Dentistry & Endodontics Vol.23 No.1
During cleaning and shaping of narrow and curved canals, it is very difficult or nearly impossible to maintain the original canal shape. Procedural accidents such as, ledge, zipping, perforation, and instrument breakage are frequently occurred and even may lead to failure of endodontic therapy. To prevent these kinds of accidents, various instrumentation techniques and materials have been introduced. Recently some nickel titanium (NiTi) files are introduced and it is reported that These NiTi files created rounder preparations with less transportation than conventional instruments in curved canals. This study compared the change of the canal curvature and procedural accidents after instrumentation produced by stainless steel K-flexo file, and NiTi rotary files (Profile 29 and Quantec 2000). Thirty narrow and curved canals (25-45 degree) of extracted human molars were randomly divided into three groups. In group 1, canals were instrumented using a step-back and watch-winding/pull motion with K-flexo files. In group 2, canals were prepared with Profile 29. Group 3, canals were prepared with Quantec 2000 files. Before and after preparation of canals, periapical radiographs were taken and scanned. The change of canal curvature were measured using Photoshop 4.0 program and the incidence of procedural accidents were also evaluated. The results were as follows : 1. All group showed some loss of canal curvature after instrumentation. 2. Average loss of canal curvature was 6.70±5.31 degree for group 1, 3.80±2.57 degree for group 2, and 5.40±4.83 degree for group 3. All group There was significant change in curvature between before and after instrumentation (p<0.05). But there was no statistical difference amoung 3 groups. 3. In group 1, there were no procedural accidents, such as ledging, perforation, or instrument fracture. In group 2, two cases of ledge and one case of instrument fracture were produced. Goup 3, each one case of ledge, perforation and instrument fracture were occurred. Whthin the limits of above results, It seems that NiTi rotary instrumentation is not All Mighty and if we use uncarefully, it is more dangerous to produce some procedural accidents than conventional hand files. But more studies should be taken to evaluate the exact effects of NiTi rotary instrumentations.
Performance of Solid Oxide Fuel Cells with Direct Internal Reforming of Methane
김영진,임형태 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.5
Performance of solid oxide fuel cells (SOFCs), in comparison with that under hydrogen fuel, were investigated under direct internal reforming conditions. Anode supported cells were fabricated with an Ni+YSZ anode, YSZ electrolyte, and LSM+YSZ cathode for the present work. Measurements of I-V curves and impedance were conducted with S/C (steam to carbon) ratio of ~ 2 at 800oC. The outlet gas was analyzed using gas chromatography under open circuit condition; the methane conversion rate was calculated and found to be ~ 90% in the case of low flow rate of methane and steam. Power density values were comparable for both cases (hydrogen fuel and internal steam reforming of methane), and in the latter case the cell performance was improved, with a decrease in the flow rate of methane with steam, because of the higher conversion rate. The present work indicates that the short-term performance of SOFCs with conventional Ni+YSZ anodes, in comparison with that under hydrogen fuel, is acceptable under internal reforming condition with the optimized fuel flow rate and S/C ratio.
삼킴 및 구음장애 소아 환자에서 Blink Reflex의 유용성 - 증례 보고 -
박정미,임형태,최익선,김정문,이계욱 대한근전도전기진단의학회 2010 대한근전도 전기진단의학회지 Vol.12 No.1
Blink reflex can be used for electrophysiological study of the brainstem function. Blink reflex shows status of polysynaptic pathway through relay of complex route, especially pons and lateral medulla. We diagnosed lesion in pons and medulla using blink reflex study in a 45-month-old girl showing severe dysarthria, dysphagia and ataxia with no evidence of abnormality from brain MRI and BAEP study. We suggest blink reflex study as a good diagnostic method for evaluating patient with dysphagia to differentiate brainstem lesion, from cerebral lesion especially in equivocal brain MRI results. Blink reflex study is more useful with advantage of non-invasive and cost effective, and more accurate than BAEP study or brain MRI in brainstem lesion.
Diagnosis, Causes and Treatments of Instability Following Total Knee Arthroplasty
장문종,임형태,이나래,문영완 대한슬관절학회 2014 대한슬관절학회지 Vol.26 No.2
Instability following total knee arthroplasty is one of the major causes of revision surgery. In most cases, it can be prevented by using an appropriate prosthesis and a good surgical technique. Particular attention should be given to confirmation of diagnosis for which thorough history taking, complete physical examination and radiographic evaluation are needed. With regard to treatment, identification of the etiology of instability is crucial for establishing proper treatment plans; instability would persist without correction of the cause of the initial instability. For successful revision surgery, balanced medio-lateral and flexion-extension gaps should be achieved. Constrained or rotating-hinge total knee prosthesis should also be considered as an alternative option for certain subsets of patients with instability.
탄소-황 복합 전극 제조 방법에 따른 리튬-황 전고체 전지 성능 변화
최한울,진주성,임형태 대한금속·재료학회 2017 대한금속·재료학회지 Vol.55 No.7
All-solid-state Li-S batteries were fabricated with lithium silicide anodes (Li4.4Si), sulfide-based glass electrolyte (Li2S-P2S5), and a sulfur composite cathode. The sulfur based composite cathode was prepared using two methods; (Case 1) mortar-mixing and (Case 2) planetary ball milling at a rotation speed of 370 rev/min for 15 min. SEM analysis results indicated that the ‘Case 2’ method improved the distribution of sulfur, carbon and solid electrolyte particles, with a reduction in particle size. This effect was reflected in impedance spectra, and eventually in charge-discharge capacity: the electrode/electrolyte interface resistance was reduced so that the average charge-discharge capacities increased with the ‘Case 2’ cathode. Thus, the present work indicates the method of preparing the sulfur composite cathode profoundly affects the performance of solid state Li-S batteries.