[Abstract]
While the transmission of echography images over the net
(tele-echography) is being deployed in practical medical applications
such diagnosis or operation, those service are still limited to
hospital-level use since that the highly-integrated and large
echography devices are assumed for those model. However, for
home health care or emergency medical service, a compact and simple
tele-echography framework is required without losing image quality
and analysis function. To implement those requirements, our proposed
framework transmits the raw signal from a mobile sensory probe;
echography images are analyzed and rendered from the signal in a
suitable way for individual distributed imaging devices such as
pagers, PC monitors or mobile phones.
[Abstract]
Positron emission tomography (PET) is a nuclear medicine-based
technique that gives tomographic images of the distribution of
positron-emitting radiopharmaceutical. A truly quantitative
analysis of PET images requires a measurement of concentration
histories of radiopharmaceutical in blood vessel and tissue.
These concentration histories are called plasma time-activity
curve (pTAC) and tissue time-activity curve (tTAC), respectively.
The pTAC is measured by serial arterial blood sampling via an
inserted catheter into the brachial artery. However, insertion
of the catheter is a burdensome operation, and it is also painful.
In my talk, I propose a novel method for extracting the pTAC from
dynamic PET images using independent component analysis (ICA).
My method reduces the serial arterial blood sampling to one-point
arterial blood sampling. One-point arterial blood sampling does not
require a catheter operation. I will present the estimated results by
applying the method to dynamic FDG-PET images.
[Abstract]
Carrier Interferometry (CI) is a novel technique which found niche in
the advanced wireless communications as a powerful tool to increase
the system performance at the expense of reasonable hardware
complexity. In multicarrier communications such as MC-CDMA
(Multicarrier Code Division Multiple Access) and OFDM (Orthogonal
Frequency Division Multiplexing), it doubles the transmission speed by
virtue of PO (Pseudo Orthogonal) CI codes (the doubling of
transmission speed can also be interpreted as doubled system capacity
assuming constant transmission speed). The idea can also be applied to
single carrier communications, namely DS (Direct Spread)-CDMA, to
exploit further the frequency diversity and to enable new frequency
usability of noncontiguous frequency bands. In this report the
potential of CI will be discussed along with the open problems worth
exploring towards implementation.
[Abstract]
In recent years, it is attracted the ad-hoc network that the mobile
computers configure by using wireless network devices. Ad-hoc network is
constructed autonomously by using of the utilization of the radio wave
when the mobile computers gather. However, the application on the ad-hoc
network is less common. Thus, I propose the system that provides the
internet connectivity to the terminals that configure the ad-hoc network
in the neighborhood of the access point of wireless LAN.
In this presentation, I introduce the configuration of the ad-hoc
network in the neighborhood of the access point. Moreover, I talk about
the selection mechanism of the access points.
[Abstract]
Visually presented text is the predominant means of transmitting
information through most computer interfaces. In order to enhance
information exchange and facilitate internet use, it is necessary to
evaluate the readability of written texts empirically, and ultimately
incorporate the results into a computational model. The present study
focuses on paraphrasing. Paraphrasing is a technique that provides
alternative expressions for a given sentence. It primarily aims to
provide various users with reading assistance and a comprehension aid of
documents. In this talk, we will propose an experiment that is designed
to test the readability of paraphrased sentences. The questions
addressed are: (1) whether structurally simpler paraphrased sentences
are easier to process than their corresponding original sentences, and
(2) whether paraphrasing influences the cohesiveness between the
sentence and the surrounding context.
[Abstract]
Constraints are inherent characteristics in almost all practical control
systems. They appear most commonly as actuator bounds on control variables,
but physical limits on state variables are also ubiquitous. It is known
that violations of such constraints drastically degrade system performances
and in worst cases lead to instability.
A reference management technique is considered for closed-loop systems with
state and/or control constraints. The management rule is represented in the
form of a piecewise state affine function, obtained from an explicit
solution to a quadratic programming problem which explicitly considers not
only a constraint fulfillment but also a tracking performance.
Furthermore, the effectiveness of the proposed method is shown by
simulation. It is more important to also perform the experimental
evaluation to demonstrate its effectiveness using a real position servomechanism.