1,703 research outputs found
多層カーボンナノチューブ分散強化型アルミニウム複合材料の作製と界面制御に関する研究
要約のみTohoku University川崎亮課
Research on Implementation Modes of Ideological and Political Courses in Pediatric Nursing
with the continuous advancement of socialist modernization, China needs more and more talents, in particular the talents who are not only high in professional techniques, but also high in ideological and moral level and thinking ability, thus producing ideological and political courses. Along with the constant development of education cause, the professional education starts to concern on ideological and political work and integrate ideological and political courses into professional teaching. To this end, the paper explores the specific implementation path of ideological and political course mode from the perspective of pediatric nursing, describes ideological and political courses in detail and points out the requirements on the construction of ideological and political courses of pediatric nursing so as to provide reference for education of pediatric nursing and improvement of students’ comprehensive quality
When Does Relay Transmission Give a More Secure Connection in Wireless Ad Hoc Networks?
Relay transmission can enhance coverage and throughput, while it can be
vulnerable to eavesdropping attacks due to the additional transmission of the
source message at the relay. Thus, whether or not one should use relay
transmission for secure communication is an interesting and important problem.
In this paper, we consider the transmission of a confidential message from a
source to a destination in a decentralized wireless network in the presence of
randomly distributed eavesdroppers. The source-destination pair can be
potentially assisted by randomly distributed relays. For an arbitrary relay, we
derive exact expressions of secure connection probability for both colluding
and non-colluding eavesdroppers. We further obtain lower bound expressions on
the secure connection probability, which are accurate when the eavesdropper
density is small. By utilizing these lower bound expressions, we propose a
relay selection strategy to improve the secure connection probability. By
analytically comparing the secure connection probability for direct
transmission and relay transmission, we address the important problem of
whether or not to relay and discuss the condition for relay transmission in
terms of the relay density and source-destination distance. These analytical
results are accurate in the small eavesdropper density regime.Comment: Accepted for publication in IEEE Transactions On Information
Forensics and Securit
Network On Network for Tabular Data Classification in Real-world Applications
Tabular data is the most common data format adopted by our customers ranging
from retail, finance to E-commerce, and tabular data classification plays an
essential role to their businesses. In this paper, we present Network On
Network (NON), a practical tabular data classification model based on deep
neural network to provide accurate predictions. Various deep methods have been
proposed and promising progress has been made. However, most of them use
operations like neural network and factorization machines to fuse the
embeddings of different features directly, and linearly combine the outputs of
those operations to get the final prediction. As a result, the intra-field
information and the non-linear interactions between those operations (e.g.
neural network and factorization machines) are ignored. Intra-field information
is the information that features inside each field belong to the same field.
NON is proposed to take full advantage of intra-field information and
non-linear interactions. It consists of three components: field-wise network at
the bottom to capture the intra-field information, across field network in the
middle to choose suitable operations data-drivenly, and operation fusion
network on the top to fuse outputs of the chosen operations deeply. Extensive
experiments on six real-world datasets demonstrate NON can outperform the
state-of-the-art models significantly. Furthermore, both qualitative and
quantitative study of the features in the embedding space show NON can capture
intra-field information effectively
Current-induced instability of domain walls in cylindrical nanowires
We study the current-driven domain wall (DW) motion in cylindrical nanowires
using micromagnetic simulations by implementing the Landau-Lifshitz-Gilbert
equation with nonlocal spin-transfer torque in a finite difference
micromagnetic package. We find that in the presence of DW Gaussian wave packets
(spin waves) will be generated when the charge current is applied to the system
suddenly. And this effect is excluded when using the local spin-transfer
torque. The existence of spin waves emission indicates that transverse domain
walls can not move arbitrarily fast in cylindrical nanowires although they are
free from the Walker limit. We establish an upper-velocity limit for the DW
motion by analyzing the stability of Gaussian wave packets using the local
spin-transfer torque. Micromagnetic simulations show that the stable region
obtained by using nonlocal spin-transfer torque is smaller than that by using
its local counterpart. This limitation is essential for multiple domain walls
since the instability of Gaussian wave packets will break the structure of
multiple domain walls.Comment: 5 pages, 6 figure
The Role of Waste Glass Powder During the Hydration Process of Composite Cementitious Materials
The role of waste glass powder (GP) during the hydration process of composite cementitious materials was investigated by using mercury intrusion porosimetry (MIP), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The compressive strength was also tested. The results indicate that the chemical activity of GP is low. But the pozzolanic reactivity of GP greatly improves with its fineness and the elevated curing temperature, which contributes to improving the mechanical strength. The hydration process of composite cementitious material containing GP is similar to that of pure cement. With the increase of GP content in the composite cement, the occurring time of second exothermic improves, but the value of second exothermic peak and the cumulative hydration heat reduce. The characteristic pore size of pastes containing GP decreases over curing age, which significantly improves their strength. GP does not modify the type of hydration products of composite cementitious material. The microstructure of hardened pastes containing GP is dense due to the generation of C-S-H gel with a low Ca/Si ratio. There is a reaction ring along GP with high fineness, which can enhance the interfacial transition zone to avoid ASR
Efficiently Disassemble-and-Pack for Mechanism
In this paper, we present a disassemble-and-pack approach for a mechanism to
seek a box which contains total mechanical parts with high space utilization.
Its key feature is that mechanism contains not only geometric shapes but also
internal motion structures which can be calculated to adjust geometric shapes
of the mechanical parts. Our system consists of two steps: disassemble
mechanical object into a group set and pack them within a box efficiently. The
first step is to create a hierarchy of possible group set of parts which is
generated by disconnecting the selected joints and adjust motion structures of
parts in groups. The aim of this step is seeking total minimum volume of each
group. The second step is to exploit the hierarchy based on
breadth-first-search to obtain a group set. Every group in the set is inserted
into specified box from maximum volume to minimum based on our packing
strategy. Until an approximated result with satisfied efficiency is accepted,
our approach finish exploiting the hierarchy.Comment: 2 pages, 2 figure
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