1,014 research outputs found
A novel approach for wafer defect pattern classification based on topological data analysis
In semiconductor manufacturing, wafer map defect pattern provides critical
information for facility maintenance and yield management, so the
classification of defect patterns is one of the most important tasks in the
manufacturing process. In this paper, we propose a novel way to represent the
shape of the defect pattern as a finite-dimensional vector, which will be used
as an input for a neural network algorithm for classification. The main idea is
to extract the topological features of each pattern by using the theory of
persistent homology from topological data analysis (TDA). Through some
experiments with a simulated dataset, we show that the proposed method is
faster and much more efficient in training with higher accuracy, compared with
the method using convolutional neural networks (CNN) which is the most common
approach for wafer map defect pattern classification. Moreover, our method
outperforms the CNN-based method when the number of training data is not enough
and is imbalanced
Cultural Values and the Korean Negotiator
Culture has an inarguable role in shaping negotiation. Negotiators interests, priorities, and strategies are affected by their culture. Each culture shares some similar elements with other cultures while also having its own unique traits. These characteristics can manifest themselves in negotiation behaviors in interesting ways. Korean culture seems to share similar values with cultures of its neighbors, most notably of China and Japan, but it also has differences that emerge with some unique negotiation strategies. This article summarizes and reports modern theories and research results and tries to evaluate how Korean culture affects some of the negotiation styles commonly observed among Korean negotiators
Optical Spectroscopy of Supernova Remnants in M81 and M82
We present spectroscopy of 28 SNR candidates as well as one H II region in
M81, and two SNR candidates in M82. Twenty six out of the M81 candidates turn
out to be genuine SNRs, and two in M82 may be shocked condensations in the
galactic outflow or SNRs. The distribution of [N II]/H{\alpha} ratios of M81
SNRs is bimodal. M81 SNRs are divided into two groups in the spectral line
ratio diagrams: an [O III]-strong group and an [O III]-weak group. The latter
have larger sizes, and may have faster shock velocity. [N II]/H{\alpha} ratios
of the SNRs show a strong correlation with [S II]/H{\alpha} ratios. They show a
clear radial gradient in [N II]/H{\alpha} and [S II]/H{\alpha} ratios: dLog ([N
II]/H{\alpha})/dLog R = -0.018 {\pm} 0.008 dex/kpc and dLog ([S
II]/H{\alpha})/dLog R = -0.016 {\pm} 0.008 dex/kpc where R is a deprojected
galactocentric distance. We estimate the nitrogen and oxygen abundance of the
SNRs from the comparison with shock-ionization models. We obtain a value for
the nitrogen radial gradient, dLog(N/H)/dLogR = -0.023 {\pm} 0.009 dex/kpc, and
little evidence for the gradient in oxygen. This nitrogen abundance shows a few
times flatter gradient than those of the planetary nebulae and H II regions. We
find that five SNRs are matched with X-ray sources. Their X-ray hardness colors
are consistent with thermal SNRs.Comment: 19 pages, 24 figures, 5 tables, ApJ accepte
(S)-[5-Methyl-3-(3-methylÂthioÂphen-2-yl)-4,5-dihydroÂisoxazol-5-yl]methanol
In the title compound, C10H13NO2S, the thioÂphene and isoxazoline rings are almost coplanar, the dihedral angle between their least-squares planes being 2.08â
(1)°. The OâH atoms of the methyl hyÂdroxy group and the N atom of the isoxazole ring are orientated in the same direction to allow for the formation of interÂmolecular OâHâŻN hydrogen bonds that lead to a supraÂmolecular chain along the a axis
Oxygen-Vacancy-Induced Orbital Reconstruction of Ti Ions at the Interface of LaAlO3/SrTiO3 Heterostructures: A Resonant Soft-X-Ray Scattering Study
Resonant soft-x-ray scattering measurements have been performed to investigate interface electronic structures of (LaAlO3/SrTiO3) superlattices. Resonant scattering intensities at superlattice reflections show clear evidence of degeneracy lifting in t(2g) states of interface Ti ions. Polarization dependence of intensities indicates the energy of d(xy) states is lower by similar to 1 eV than two other t(2g) states. The energy splitting is insensitive to epitaxial strain. The orbital reconstruction is induced by oxygen vacancies and confined to the interface within two unit cells, indicating charge compensation at the polar interfaces. DOI: 10.1103/PhysRevLett.110.017401X112723Nsciescopu
Systemic EBV+ T-cell lymphoma in elderly patients: comparison with children and young adult patients
Fulminant EpsteinâBarr virus (EBV+) T-cell lymphoma in immunocompetent elderly patients is rare and its character has not been well defined. This study analyzed the clinicopathological features of five elderly patients (group A: 50â84Â years) and compared them with those of eight children and young adult patients with systemic T-cell lymphomas (group B: 10â34Â years). Group A more commonly presented with generalized lymphadenopathy (nâ=â3) than did group B (nâ=â1). Chronic active EBV infection (nâ=â3) and hydroa vacciniforme-like eruptions (nâ=â1) were seen in group B, while group A showed no evidence of chronic EBV infection, but did show chronic hepatitis B or C virus infections (nâ=â3). The histological and immunophenotypical findings were similar. All patients died within 1 to 14Â months of diagnosis. These findings suggest that EBV+ T-cell lymphoma in elderly patients is a unique disease with an underlying derangement of T-cell immunity and failure to eradicate infected virus. Additional factors related to senility may play a role in the disruption of homeostasis between the virus and the hostâs immune system
Electrical spin injection and detection in an InAs quantum well
We demonstrate fully electrical detection of spin injection in InAs quantum
wells. A spin polarized current is injected from a NiFe thin film to a
two-dimensional electron gas (2DEG) made of InAs based epitaxial multi-layers.
Injected spins accumulate and diffuse out in the 2DEG, and the spins are
electrically detected by a neighboring NiFe electrode. The observed spin
diffusion length is 1.8 um at 20 K. The injected spin polarization across the
NiFe/InAs interface is 1.9% at 20 K and remains at 1.4% even at room
temperature. Our experimental results will contribute significantly to the
realization of a practical spin field effect transistor
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Multilayer fabrication of unobtrusive poly(dimethylsiloxane) nanobrush for tunable cell adhesion
Precise modulation of polymer brush in its thickness and grafting density can cause unexpected cell behaviors and regulated bioactivities. Herein, a nanoscale poly(dimethylsiloxane) (PDMS) brush was employed to use as a controllable material for cell adhesion. Facile fabrication of ultrathin monolayer PDMS nanobrush on an underlying substrate facilitated regaining cell adhesion through long-range cell attractive forces such as the van der Waals forces. We showed that cell adhesion is diminished by increasing the number of nanobrush layers, causing a gradual decrease of the effectiveness of the long-range force. The result demonstrates that ultrathin PDMS nanobrush can either promote or inhibit cell adhesion, which is required for various biomedical fields such as tissue-engineering, anti-fouling coating, and implantable biomaterials and sensors
Framework for the validation of simulation-based productivity analysis: focused on curtain wall construction process
 As construction projects have become more complicated in design and construction, it is necessary to establish the construction operational plans in advance. However, there were some limitations in analyzing construction producÂtivity due to the difficulty of collecting accurate data. To address this challenge, this study aimed to develop the frameÂwork for the validation of simulation-based productivity analysis, which consisted of three measures: (i) validation of the measured productivity data as target variable; (ii) validation of the measured duration data as input variable; and (iii) validation of the simulation model compared to the actual construction process. To verify the feasibility of the proposed framework, this study focused on the curtain wall construction project of âSâ office building as a case study. The T-test was applied to investigate the statistical difference between the measure and simulated productivity. It was determined that the significance level α in the T-test for the unloading process was 0.136 with 95% confidence interval; the lifting process, 0.106; and the installing process, 0.311. As a result, there was no significant difference between the measured and simulated productivity. The proposed framework could enable executives and managers in charge of project planÂning and scheduling to accurately predict the simulation-based productivity.
First published online:Â 13 Jul 201
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