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EEG-based usability assessment of 3D shutter glasses
Wenzel, Markus A,Schultze-Kraft, Rafael,Meinecke, Frank C,Fabien Cardinaux,Kemp, Thomas,Klaus-Robert Mü,ller,Gabriel Curio,Benjamin Blankertz IOP 2016 Journal of neural engineering Vol.13 No.1
<P> <I>Objective.</I> Neurotechnology can contribute to the usability assessment of products by providing objective measures of neural workload and can uncover usability impediments that are not consciously perceived by test persons. In this study, the neural processing effort imposed on the viewer of 3D television by shutter glasses was quantified as a function of shutter frequency. In particular, we sought to determine the critical shutter frequency at which the ‘neural flicker’ vanishes, such that visual fatigue due to this additional neural effort can be prevented by increasing the frequency of the system. <I>Approach.</I> Twenty-three participants viewed an image through 3D shutter glasses, while multichannel electroencephalogram (EEG) was recorded. In total ten shutter frequencies were employed, selected individually for each participant to cover the range below, at and above the threshold of flicker perception. The source of the neural flicker correlate was extracted using independent component analysis and the flicker impact on the visual cortex was quantified by decoding the state of the shutter from the EEG. <I>Main Result.</I> Effects of the shutter glasses were traced in the EEG up to around 67?Hz—about 20?Hz over the flicker perception threshold—and vanished at the subsequent frequency level of 77?Hz. <I>Significance.</I> The impact of the shutter glasses on the visual cortex can be detected by neurotechnology even when a flicker is not reported by the participants. <I>Potential impact.</I> Increasing the shutter frequency from the usual 50?Hz or 60?Hz to 77?Hz reduces the risk of visual fatigue and thus improves shutter-glass-based 3D usability.</P>
Can we substitute the intuition of an experienced bridge inspector by monitoring?
Wenzel, Helmut,Tanaka, Hiroshi,Hollrigl-Binder, Michaela,Allmer, Helga Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.3
Damage quantification is a major goal of the SHM community. Methodologies to introduce a quantity for actual condition of a structure into the assessment process are desired. The idea that the condition of a structure is represented in the character of its dynamic response is fully accepted by the SHM community. The VCLIFE methodology quantifies condition analyzing input from monitoring.
Can we substitute the intuition of an experienced bridge inspector by monitoring?
Helmut Wenzel,Hiroshi Tanaka,Michaela Höllrigl-Binder,Helga Allmer 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.3
Damage quantification is a major goal of the SHM community. Methodologies to introduce aquantity for actual condition of a structure into the assessment process are desired. The idea that thecondition of a structure is represented in the character of its dynamic response is fully accepted by the SHMcommunity. The VCLIFE methodology quantifies condition analyzing input from monitoring.
Nikolai G. Wenzel 인하대학교 국제관계연구소 2010 Pacific Focus Vol.25 No.3
A country's constitutional order will have a strong impact on political stability and economic performance. In order for a formal constitution to stick, it must match the underlying constitutional culture. If the two are slightly mismatched, compromise will follow, in the form of constitutional change. If the two are radically mismatched, the informal (culture) will reject the formal (parchment), and with it, constitutionalism itself. This paper uses the case of post-war constitutional choice in Japan and the Philippines to illustrate the theory. Both countries adopted similar, US-influenced constitutions, under Allied military occupation. The Japanese constitution matched the underlying constitutional culture and stuck, leading to stability and growth. The Filipino constitution, on the other hand, did not match the underlying culture, and was rejected, leading to dictatorship and economic stagnation.
기 - 액 흡수계에서 spiral Wires - Radial Plates 충전물의 진동효과
김우식,Wenzel,L A 한국화학공학회 1982 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.20 No.1
본 연구는 기-액 흡수 물질전달계에서 충전-진동에 의하여 물질전달 속도를 증가시키는 연구로서 충전탑에 새로 고안한 Spiral Wires-Radial Plates를 충전시키고, 진동을 주어 물질전달에 미치는 제반 영향을 측정 분석하였다. 가스유속의 변화에 따른 가스 hold-up과 Danckwerts Plots법에 의한 기-액계 면적 및 액측 물질전달 계수를 측정하였으며 물질전달 인자간의 상호관계를 규명하고 정량적 관계식을 제시하였다. This study was concerning to improve the mass transfer rate by packing-vibration and to investigate the relationship among the mass transfer factors in the gas-liquid contact absorption system. The gas-liquid contact mass transfer system was operated by the vibration of the newly designed spiral wires-radial plates packing in the column. The gas hold-up, gas-liquid interfacial areas and liquidside mass transfer coefficients were measured and analyzed, and a quantitative mass transfer equation on this absorption system was presented.