1,454 research outputs found
Classification of involutions on Enriques surfaces
We present the classification of involutions on Enriques surfaces. We
classify those into 18 types with the help of the lattice theory due to
Nikulin. We also give all examples of the classification.Comment: 25 pages, 42 figure
食材性オオゴキブリの生態学的研究
京都大学新制・課程博士博士(農学)甲第24656号農博第2539号新制||農||1097(附属図書館)学位論文||R5||N5437(農学部図書室)京都大学大学院農学研究科森林科学専攻(主査)教授 北山 兼弘, 教授 田中 千尋, 教授 松浦 健二学位規則第4条第1項該当Doctor of Agricultural ScienceKyoto UniversityDGA
Twisted intersection colorings, invariants and double coverings of twisted links
Twisted links are a generalization of classical links and correspond to
stably equivalence classes of links in thickened surfaces. In this paper we
introduce twisted intersection colorings of a diagram and construct two
invariants of a twisted link using such colorings. As an application, we show
that there exist infinitely many pairs of twisted links such that for each pair
the two twisted links are not equivalent but their double coverings are
equivalent.
We also introduce a method of constructing a pair of twisted links whose
double coverings are equivalent
Coupling between pore formation and phase separation in charged lipid membranes
We investigated the effect of charge on the membrane morphology of giant
unilamellar vesicles (GUVs) composed of various mixtures containing charged
lipids. We observed the membrane morphologies by fluorescent and confocal laser
microscopy in lipid mixtures consisting of a neutral unsaturated lipid
[dioleoylphosphatidylcholine (DOPC)], a neutral saturated lipid
[dipalmitoylphosphatidylcholine (DPPC)], a charged unsaturated lipid
[dioleoylphosphatidylglycerol (DOPG)], a charged saturated
lipid [dipalmitoylphosphatidylglycerol (DPPG)], and
cholesterol (Chol). In binary mixtures of neutral DOPC/DPPC and charged
DOPC/DPPG, spherical vesicles were formed. On the other
hand, pore formation was often observed with GUVs consisting of
DOPG and DPPC. In a DPPC/DPPG/Chol
ternary mixture, pore-formed vesicles were also frequently observed. The
percentage of pore-formed vesicles increased with the DPPG
concentration. Moreover, when the head group charges of charged lipids were
screened by the addition of salt, pore-formed vesicles were suppressed in both
the binary and ternary charged lipid mixtures. We discuss the mechanisms of
pore formation in charged lipid mixtures and the relationship between phase
separation and the membrane morphology. Finally, we reproduce the results seen
in experimental systems by using coarse-grained molecular dynamics simulations.Comment: 34 pages, 10 figure
An On-Device Federated Learning Approach for Cooperative Anomaly Detection
Most edge AI focuses on prediction tasks on resource-limited edge devices
while the training is done at server machines. However, retraining or
customizing a model is required at edge devices as the model is becoming
outdated due to environmental changes over time. To follow such a concept
drift, a neural-network based on-device learning approach is recently proposed,
so that edge devices train incoming data at runtime to update their model. In
this case, since a training is done at distributed edge devices, the issue is
that only a limited amount of training data can be used for each edge device.
To address this issue, one approach is a cooperative learning or federated
learning, where edge devices exchange their trained results and update their
model by using those collected from the other devices. In this paper, as an
on-device learning algorithm, we focus on OS-ELM (Online Sequential Extreme
Learning Machine) to sequentially train a model based on recent samples and
combine it with autoencoder for anomaly detection. We extend it for an
on-device federated learning so that edge devices can exchange their trained
results and update their model by using those collected from the other edge
devices. This cooperative model update is one-shot while it can be repeatedly
applied to synchronize their model. Our approach is evaluated with anomaly
detection tasks generated from a driving dataset of cars, a human activity
dataset, and MNIST dataset. The results demonstrate that the proposed on-device
federated learning can produce a merged model by integrating trained results
from multiple edge devices as accurately as traditional backpropagation based
neural networks and a traditional federated learning approach with lower
computation or communication cost
Economic effects analysis of public investment in road improvement works in Hokkaido. Simulation analysis based on a macro-econometric model of Hokkaido
The objective of this study is to clarify how public investment in road improvement projects over a given analytical period of time has affected Hokkaido`s economic structure on the whole in relation to the industrial economy, prefectural income, household consumption, and commodity prices, through a simulation analysis based on a macro-econometric model. More specifically, our goal is to model both the direct effects achieved through the use of improved roads including the reduction of time-distance coefficients, the reduction of transportation costs and market expansion, and the indirect effects such as enhancement of lifestyles and convenience and influence on other public projects including living area improvement and promotion of regional areas, and to identify these effects quantitatively. Taking data availability into consideration, this study covers a 21-year analysis period covering the years 1976 through 1996. In constructing a quantitative model, the effect flow to be modeled was examined from two perspectives: 1) an effect flow showing the effects of road improvement works on production efficiency and market efficiency; and 2) an effect flow showing the effects of road improvement works on living standards considering convenience and lifestyle improvement. Then we attempted building a model that could indicate the occurrence of these effects in both Flow and Stock contexts. As a result of the simulation analysis, it was clarified that application of road improvement works would bring about pronounced positive economic benefits in tertiary industries, particularly in the transportation-service and wholesale/retail sectors, and greatly expand the prefectural net product on the whole. It was also revealed that these expansion effects would stimulate an increase in the prefectural income and in private final consumption expenditure. Furthermore, a simulation analysis on the economic effects that the expansion of the express-highway network would have on Hokkaido`s entire economy revealed that there would be a large effect particularly on investment and production within the transportation/communication industry and also on the commercial output of the wholesale/retail industry.
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