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Assessment of Fracture Characteristics from Revised Small Punch Test Using Pre - cracked Specimen
Jang, Bog Ju,Dongil Kwon 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
Small punch (SP) test has been utilized to analyze the neutron irradiation damage of nuclear vessels. Mince this technique is easy, simple, and nondestructive, it can be applied to evaluate the mechanical properties and material degradation of in-service components. Conventional SP test has evaluated the ductile-brittle transition temperature and the equivalent fracture strain by the interpretations of load-deflection curve and the change of specimen thickness, respectively. The assumption that fracture occurs at maximum load is, however, not reasonable because the crack initiates at smaller load. In this study, in order to evaluate quantitatively fracture characteristics based on fracture mechanics, the pre-crack is introduced to SP specimen and acoustic emission is used to determine the crack initiation point. Using the load at crack initiation point, the fracture toughness of thin plate is calculated through bending theory. Therefore, the fracture characteristics of thin plate can be evaluated more reliably by using revised SP test.
슬관절 전치환술 환자의 저체온 관리를 위한 ASPAN의 근거기반 임상실무 가이드라인 적용 효과
유제복(Yoo, Je Bog),박현주(Park, Hyun Ju),채지연(Chae, Ji Yeoun),이은주(Lee, Eun Ju),신유정(Shin, Yoo Jung),고저스틴상욱(Ko, Justin Sangwook),김남초(Kim, Nam Cho) 한국간호과학회 2013 Journal of Korean Academy of Nursing Vol.43 No.3
Purpose: In this study an examination was done of the effects of the American Society of PeriAnesthesia Nurses (ASPAN) Evidence-Based Clinical Practice Guidelines on body temperature, shivering, thermal discomfort, and time to achieve normothermia in patients undergoing total knee replacement arthroplasty (TKRA) under spinal anesthesia. Methods: This study was an experimental study with a randomized controlled trial design. Participants (n=60) were patients who underwent TKRA between December 2011 and March 2012. Experimental group (n=30) received active and passive warming measures as described in the ASPAN’s guidelines. Control group (n=30) received traditional care. Body temperature, shivering, thermal discomfort, time to achieve normothermia were measured in both groups at 30 minute intervals. Results: Experimental group had slightly higher body temperature compared to control group (p=.002). Thermal discomfort was higher in the experimental group before surgery but higher in the control group after surgery (p=.034). It decreased after surgery (p=.041) in both groups. Time to achieve normothermia was shorter in the experimental group (p=.010). Conclusion: ASPAN’s guidelines provide guidance on measuring patient body temperature at regular intervals and on individualized and differentiated hypothermia management which can be very useful in nursing care, particularly in protecting patient safety and improving quality of nursing.
대한간학회지 제7차 추계학술대회 논문집 : 전격성 간부전에 대한 응급 간이식수술: 생체간이식을 중심으로
이승규 ( Lee Seung Gyu ),박광민 ( Park Gwang Min ),황신 ( Hwang Sin ),김기훈 ( Kim Gi Hun ),전장용 ( Jeon Jang Yong ),주선형 ( Ju Seon Hyeong ),주종우 ( Ju Jong U ),문덕복 ( Mun Deog Bog ),이영주 ( Lee Yeong Ju ),민병철 ( Min Bye 대한간학회 2001 Clinical and Molecular Hepatology(대한간학회지) Vol.7 No.3(S)
Effect of the Ethanol Extract of Propolis on Formation of Streptococcus mutans Biofilm
Bog-Im Park,Yeon-Woo Jung,Young-Hoi Kim,Sang-Moo Lee,Lee-Seong Kwon,Kang-Ju Kim,So-Youn An,Na-Young Choi6,Yong-Ouk You 대한구강생물학회 2016 International Journal of Oral Biology Vol.41 No.4
Streptococcus mutans (S. mutans) is one of the most important bacteria in the formation of dental plaque and dental caries. S. mutans adheres to an acquired pellicle formed on the tooth surface, and aggregates with many oral bacteria. It initiates plaque formation by synthesizing glucan from sucrose, which is catalyzed by glucosyltransferases. Propolis is a resinous mixture produced by honeybees, by mixing saliva and beeswax with secretions gathered from wood sap and flower pollen. Bees prevent pathogenic invasions by coating the propolis to the outer and inner surface of the honeycomb. Propolis has traditionally been used for the treatment of allergic rhinitis, asthma and dermatitis. We investigated the inhibitory effects of propolis ethanol extract on biofilm formation and gene expression of S. mutans. The biofilm formation of S. mutans was determined by scanning electron microscopy (SEM) and safranin staining. We observed that the extract of propolis had an inhibitory effect on the formation of S. mutans biofilms at concentrations higher than 0.2 mg/ml. Real-time PCR analysis showed that the gene expression of biofilm formation, such as gbpB, spaP, brpA, relA and vicR of S. mutans, was significantly decreased in a dose dependent manner. The ethanol extract of propolis showed concentration dependent growth inhibition of S. mutans, and significant inhibition of acid production at concentrations of 0.025, 0.05, 0.1 and 0.2 mg/ml, compared to the control group. These results suggest that the ethanol extract of propolis inhibits gene expression related to biofilm formation in S. mutans.
Advanced Indentation System을 이용한 연성 파괴인성 평가식의 모델링
주장복,이정석,심홍석,이승건,권동일 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.1
Fracture properties of various structural steels were determined non-destructively using the advanced indentation system (AIS), which is developed on the basis of continuous indentation technique. In this study, conventional critical strain model was modified to predict the ductile fracture toughness from the AIS data. In deriving the ductile fracture toughness model, fracture strain and characteristic length were estimated using the stress triaxiality and the work-hardening exponent. AIS tests were conducted on carbon steels, stainless steels, aluminum alloys and copper alloys. For all these materials, the results of indentation test were compared to those of the standard fracture toughness test methods, which shows that the present analysis can predict successfully the ductile fracture toughness of structural steels.