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이석진(Seok Jin Lee),전성용(Sung Yong Jun),이주호(Joo Ho Lee),최성록(Seong Rok Choi) 한국방재안전학회 2009 한국방재안전학회 논문집 Vol.2 No.2
When the exposed surface of rock slopes investigated, various factors have not been considered. The factors required to be considered include the vlume swelling of rock caused by stress release at the fault zone, unexposed discontinuities in the earth and so on. Also, rock slope failure occurs sometimes due to these factors. In this paper, we intend to help engineers to judge about the stability of similar new cutting-slopes or the maintenance of already cut-slope, so that they can consider these factors. 암반사면에 대한 표면조사 시에는, 암반 사면파괴로 인한 재해의 원인이 될 수 있는 파쇄대에서의 응력이완, 노출되지 않은 불연속면 등의 요인들을 고려하지 못하는 한계가 있다. 이에 본 고에서는 사면의 절취 또는 절취사면의 유지관리에 있어서 사면 안정성에 대한 판단을 도와 사연 파괴로 인한 재해를 예방하는 방안을 제시하고자 한다.
One-Sided Nondestructive Evaluation of CFRP Composites By Using Ultrasonic Sound
Kwang-Hee Im(임광희),Gui-Lin Zhang(장계림),Sung-Rok Choi(최성록),Chang-Hee Ye(예창희),Je-Sung Ryu(류제성),Soo-Hwan Lim(임수환),Min-Gui Han(한민규),David K. Hsu 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.1
It is well known that stiffness of composites depends on layup sequence of CFRP(carbon fiber reinforced plastics) laminates because the layup of composite laminates influences their properties. Ultrasonic NDE of composite laminates is often based on the backwall echoes of the sample. A pair of such transducers was mounted in a holder in a nose-to-nose fashion to be used as a scanning probe on composites. Miniature potted angle beam transducers were used ( Rayleigh waves in steel) on solid laminates of composites. Experiments were performed to understand the behavior of the transducers and the nature of the waves generated in the composite (mode, wave speed, angle of refraction). C-scan images of flaws and impact damage were then produced by combining the pitch-catch probe with a portable manual scanner known as the Generic Scanner (”GenScan”). The pitch-catch signal was found to be more sensitive than normal incidence backwall echo of longitudinal wave to fiber orientation of the CFRP composites, including low level porosity, ply waviness, and cracks. Therefore, it is found that the experimentally Rayleigh wave variation of pitch-catch ultrasonic signal was consistent with numerical results and one-side ultrasonic measurement might be very useful to detect the defects.
강준모 ( Jun Mo Kang ),정국진 ( Kuk Jin Jung ),정철 ( Cheol Jung ),정훈교 ( Hun Gyo Jung ),조준모 ( Jun Mo Cho ),조진환 ( Jin Hwan Cho ),지민교 ( Min Gyo Ji ),채현규 ( Hyun Kyu Chae ),최성록 ( Sung Rok Choi ),최진선 ( Jin Sun Cho 한국정신병리진단분류학회 2013 精神病理學 Vol.22 No.1
Objectives:Considering the significant limitations of current available interventions on attention-deficit/hyperactivity disorder(ADHD), it has become a consensus among clinicians that new treatment options for ADHD are needed. In recent years, Neurofeedback(NF) has been suggested as a promising possibility. This article aims to review studies that have existing evidence and to inform clinicians on the use of NF as an alternative treatment for ADHD. Methods:Website Pubmed was searched in order to get studies that NF used for treatment of ADHD. We had select studies designed randomized controlled trials, peer reviewed. Results:10 studies and 1 consult study reviewed. There are no positive results except 2 studies reported statistically significant improvement of neurocognitive function. All other studies either did not directly test or did not demonstrate significant differences between θ/β training compared to wait list control, placebo control, or active treatment control. The findings of the studies reviewed do not support NF training as a first-line therapy. Conclusion:ADHD patients have treated with NF in many studies reported results statistically not significant improvement of neurocognitive function. But It’s therapeutic value can not be entirely refuse compared to different empirical treatments. In future, more research is needed on issues such as diversified NF according to ADHD subtypes, patient characteristics, and other non-specific treatment effects.