Nagoya Institute of Technology

About: Nagoya Institute of Technology is a education organization based out in Nagoya, Japan. It is known for research contribution in the topics: Thin film & Catalysis. The organization has 10766 authors who have published 19140 publications receiving 255696 citations. The organization is also known as: Nagoya Kōgyō Daigaku & Nitech.

Randomized initialization protocols for packet radio networks

Abstract: The main contribution of this work is to propose efficient randomized leader election and initialization protocols for Packet Radio Networks (PRN, for short). As a result of the initialization protocol, the n stations of a PRN are assigned distinct integer IDs from 1 to n. The results include protocols to: (1) initialize the single-channel PRN with the collision detection (CD) capability in O(n) rounds with probability at least 1-1/(2/sup n/); (2) initialize the k-channel PRN with CD capability in O(n/k) rounds with probability at least 1-1/n, whenever k/spl les/n/3 log n; (3) elect a leader on the single-channel PRN with no CD in O((log n)/sup 2/) broadcast rounds with probability at least 1-1/n; (4) initialize the single-channel PRN with no CD in O(n) rounds with probability at least 1-1/(2/spl radic/n); (5) initialize the k-channel PRN with no CD in O(n/k) broadcast rounds with probability at least 1-1/n, whenever k/spl les/n/(4(log n)/sup 2/).

Robust Multilinear Tensor Rank Estimation Using Higher Order Singular Value Decomposition and Information Criteria

Abstract: Model selection in tensor decomposition is important for real applications if the rank of the original data tensor is unknown and the observed tensor is noisy. In the Tucker model, the minimum description length (MDL) or Bayesian information criteria have been applied to tensors via matrix unfolding, but these methods are sensitive to noise when the tensors have a multilinear low rank structure given by the Tucker model. In this study, we propose new methods for improving the MDL so it is more robust to noise. The proposed methods are justified theoretically by analyzing the “multilinear low-rank structure” of tensors. Extensive experiments including numerical simulations and a real application to image denoising are provided to illustrate the advantages of the proposed methods.

Generation of E' centers and oxygen hole centers in synthetic silica glasses by γ irradiation

Abstract: Generation of typical paramagnetic centers by \ensuremath{\gamma} irradiation was studied for various kinds of synthetic silica glasses. Growth behavior of E' centers and nonbridging oxygen hole centers (NBOHC's) with \ensuremath{\gamma}-ray dose depends on contained preexisting point defects. By irradiation at room temperature, E' centers grow linearly and show a saturating tendency in silicas that contain precursors for E' centers, such as oxygen-deficient centers (ODC's), Si-H bonds or Si-Cl bonds. In silicas that contain very few precursors for E' centers, the growth of E' centers with the dose substantially equals that of NBOHC's and both follow a sublinear growth law in which the concentration of the defects is proportional to the square root of the dose. These results lead to the conclusion that \ensuremath{\gamma} irradiation fundamentally creates defect pairs of an E' center and an oxygen hole center from an intrinsic Si-O network of amorphous silica; this is in addition to a large amount of E' centers induced from preexisting point defects as precursors. By irradiation at 77 K, E' centers and self-trapped holes are suggested to be formed as the defect pair from the Si-O network, while the conversion of the precursors into E' centers is probably lessened. Concentration of E' centers generated by \ensuremath{\gamma} irradiation is almost the same as that of irradiation of ultraviolet lasers and x rays if they are compared based on the absorbed energy. Thus, defect generation with \ensuremath{\gamma} rays is suggested to involve similar fundamental processes as those with photons, which have much smaller energy than \ensuremath{\gamma} rays.

Low Reynolds number fully developed two-dimensional turbulent channel flow with system rotation

Abstract: Theoretical and experimental studies have been performed on fully developed twodimensional turbulent channel flows in the low Reynolds number range that are subjected to system rotation. The turbulence is affected by the Coriolis force and the low Reynolds number simultaneously. Using dimensional analysis, the relevant parameters of this flow are found to be Reynolds number Re* = u*D/v (u* is the friction velocity, D the channel half-width) and Ωv/u2* (Ω is the angular velocity of the channel) for the inner region, and Re* and ΩD/u* for the core region. Employing these parameters, changes of skin friction coefficients and velocity profiles compared to nonrotating flow can be reasonably well understood. A Coriolis region where the Coriolis force effect predominates is shown to exist in addition to conventional regions such as viscous and buffer regions. A flow regime diagram that indicates ranges of these regions as a function of Re* and |Ω|v/u2* is given from which the overall flow structure in a rotating channel can be obtained.Experiments have been made in the range of 56 ≤ Re* ≤ 310 and -0.0057 ≤ Ωv/u2* ≤ 0.0030 (these values correspond to Re = 2Um D/v from 1700 to 10000 and rotation number R0 = 2|Ω|D/Um up to 0.055; Um is bulk mean velocity). The characteristic features of velocity profiles and the variation of skin friction coefficients are discussed in relation to the theoretical considerations.

Trifluoromethylation of Aromatic Isoxazoles: Regio- and Diastereoselective Route to 5-Trifluoromethyl-2-isoxazolines

Abstract: The activation of aromatic, heteroaromatic, or styryl isoxazoles such as (I) or (V) with a nitro group at the 4-position results in the first diastereoselective trifluoromethylation at the 5-position by nucleophilic addition of Tms-CF3.