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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>
CEP-stable, sub-6 fs, 300-kHz OPCPA system with more than 15 W of average power.
Prinz, Stephan,Haefner, Matthias,Teisset, Catherine Yuriko,Bessing, Robert,Michel, Knut,Lee, Yeon,Geng, Xiao Tao,Kim, Seungchul,Kim, Dong Eon,Metzger, Thomas,Schultze, Marcel Optical Society of America 2015 Optics express Vol.23 No.2
<P>We report on a CEP-stable OPCPA system reaching multi-GW peak powers at 300 kHz repetition rate. It delivers 15 W of average power, over 50 ?J of compressed pulse energy and a pulse duration below 6 fs. By implementing an additional pump-seed-synchronization, the output parameters are stabilized over hours with power fluctuations of less than 1.5%.</P>
존 슐츠 연세대학교 동서문제연구원 캐나다 연구센터 1990 캐나다 연구 Vol.2 No.-
여러분은 모두 캐나다를 연구하는 분들이기 때문에 이러한 질문에 대해 여러분을 만족시키고, 여러분의 연구들에 도움을 줄 수 있는 대답은 이미 갖고 계시리라고 생각한다. 필자는 그 대답을 알고 있다고 생각한다.
Schultz, Bruce T.,Teigler, Jeffrey E.,Pissani, F.,Oster, Alexander F.,Kranias, G.,Alter, G.,Marovich, M.,Eller, Michael A.,Dittmer, U.,Robb, Merlin L.,Kim, Jerome H.,Michael, Nelson L.,Bolton, D.,Stre Cell Press 2016 Immunity Vol.44 No.1
<P>A central effort in HIV vaccine development is to generate protective broadly neutralizing antibodies, a process dependent on T follicular helper (Tfh) cells. The feasibility of using peripheral blood counterparts of lymph node Tfh cells to assess the immune response and the influence of viral and vaccine antigens on their helper functions remain obscure. We assessed circulating HIV-specific IL-21(+) CD4(+) T cells and showed transcriptional and phenotypic similarities to lymphoid Tfh cells, and hence representing peripheral Tfh (pTfh) cells. pTfh cells were functionally active and B cell helper quality differed depending on antigen specificity. Furthermore, we found higher frequency of pTfh cells in peripheral blood mononuclear cell specimens from the ALVAC+AIDSVAX (RV144) HIV vaccine trial associated with protective antibody responses compared to the non-protective DNA+Ad5 vaccine trial. Together, we identify IL-21(+) CD4(+) T cells as pTfh cells, implicating them as key populations in the generation of vaccine-evoked antibody responses.</P>
Incorporating Coding on Student Experience: Lessons Learned from an Action Research
Schultz, Meghan,Noh, Jihwa The Youngnam Mathematical Society 2020 East Asian mathematical journal Vol.36 No.2
The purpose of this action research project was to study the effects of incorporating coding into the middle school math classroom affected student dispositions with math and their understanding of mathematical concepts. The project, involving a total of 107 US middle school students, used five data sources to examine these effects: a survey, a chart measuring student engagement, a pre- and post-assessment before and after the coding project, and teacher observation with reflection forms. After analyzing the data, it was found that incorporating coding into the middle school math classroom could have a positive impact on student math dispositions and their understanding of math concepts.
Molecular-beam spectroscopy with an infinite interferometer: spectroscopic resolution and accuracy
Schultz Thomas,Heo In,Lee Jong Chan,Özer Begüm Rukiye 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.9
An interferometer with efectively infnite maximum optical path diference removes the dominant resolution limit for interferometric spectroscopy. We present mass-correlated rotational Raman spectra that represent the world’s highest resolution scanned interferometric data and discuss the current and expected future limitations in achievable spectroscopic performance.