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Associate Professor |
Visiting Researcher |
Special Researcher |
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In AY2007, the laboratory held two important international conferences on the campus
during the period from )October 16 to 19, 2007. They were "The 7th IEEE International
Conference on Computer and Information Technology (IEEE CIT 2007)" and
"The 6th International Conference on Bioelectromagnetism (ICBEM 2007)". These conferences
were not only supported by the university, but the domestic society. Mr. Sato,
the governor of Fukushima prefecture, kindly gave a speech at the opening ceremony.
Mr. Kanke, the Mayer of Aizu-wakamatsu city, kindly attended the conference dinner
party and gave a speech. Prof. Wei served general chairs for two conferences. Prof. Chen
was financial chair for IEEE CIT 2007, and Dr. Zhu was secretary for ICBEM 2007.
Eight students from the laboratory presented papers at the conferences. All students of
the laboratory took an active part in the conference service support. Ms. Mashiko made
a great contribution to the conference service that satisfied most of our international
attendants. In AY2007, a Ph.D. student, Mr. Zhaomin Zhang, graduated and earned the doctor degree in Computer Science and Engineering (congratulations!), in developing a mobile network-based multimedia teleconference system for homecare services (this work was later published in Telemedicine and e-Health, Vol 14, No. 2, 147-155, March 2008). The following are some of Prof. Weis keyword for research activity in AY 2007:
Main topics include:
|
Refereed Journal Papers
| [dm-wei-01:2007] |
Zhaomin Zhang, Aiguo He, and Daming Wei. A Mobile Network-based
Multimedia Teleconference System for Homecare Services. Telemedicine and
e-Health, 14(2):147-155, 2008. |
|
As most research and development for homecare services have focused on providing
connections between home and service centers, the goal of the present work is to develop
techniques and create realtime communications to connect service centers and
homecare workers in mobile environments. A key technical issue for this research
is how to overcome the limitation of bandwidth in mobile media and networks. Effort
has been made to balance performance of communication and basic demands
in telehealth through optimized system design and technical implementation. Implementations
using 3G (third generation) FOMA (Freedom Of Mobile multimedia
Access) and PHS (Personal Handyphone System) were developed and evaluated.
We conclude that the system we developed based on 3G FOMA provides sufficient
and satisfactory functions for use in homecare services. |
|
| [dm-wei-02:2007,zhuxin-02:2007] |
Takeshi Tsutsumi, Xin Zhu, Daisuke Wakatsuki,
Nobuyuki Shimizu, Kouhei Wakabayashi, Youichi Takeyama, and Daming
Wei. A simulation of ischemic ST segment depression derived from abnormal
local action potentials in left ventricular free wall in reference to
experimentally measuring injury current. International Journal of Bioelec-
tromagnetism, 9(1):9-10, 2007. |
| We tried to examine the relationship between the shapes of ST segment and action
potential (AP) in ischemic area by 3-D computer simulation in reference to experimental
study. Aoki-Wei model was applied to this study. The ischemic cell units
were assigned to the lateral wall of the left ventricle. Electrophysiologic properties
of model cells are specified by their parameters concerning the shape of AP. In in
vitro experimenst,the APs from ischemic-like and normal sites were measured from
epicardial preparations from the canine heart. The positive shift of RMP was a
major factor to induce the horizontal ST depression. The downslope ST depression
was simulated in the instance of both the loss of AP amplitude and AP shortening
extended from endcardial to epicardial site .The results may provide the useful
interpretation of clinical ST abnormalities in ischemic heart disease.
|
|
| [dm-wei-03:2007] |
Kunio Takahashi and DamingWei. Construction of Personalized Heart
Models from MRI Images. International Journal of Bioelectromagnetism,
9(2):73-74, 2007. |
|
[Purpose] Various forms of ST depression have been observed in the patient with
ischemic heart disease( IHD ). The mechanisms of it have not fully clarified. In
this preliminary study, we tried to examine the relationship between the shapes of
ST segment and action potential ( AP ) in ischemic area by 3-D computer simulation.
[Design] Aoki-Wei model was applied to this study. The ischemic cell units
were assigned to the lateral wall of the left ventricle. Electrophysiologic properties
of model cells are specified by their parameters concerning the shape of AP. Following
parameters of ischemic cells were adjusted to reproduce morphology of ST
depression; AP amplitude (APA), resting membrane potential( RMP ), durations of
phase II and III of AP . [Findings] Upsloping type of ST depression was simulated
when the loss of APA in ischemic lesion and AP lengthening in border zone were
assigned. The positive shift of RMP was a major factor to induce the horizontal
ST depression. The downslope ST depression was simulated in the instance of both
the loss of AP amplitude and AP shortening extended from endcardial to epicardial
site. If 10mv positive shift of RMP or 10mv reduction of APA, 0.06 or 0.04mv
ST depressions were seen. [Conclusions] The results were suggested that the extent
of ischemic lesion is larger in downslope than in upslope type ST depression, and
the appearance of horizontal type chie
y depend on the displacement of RMP. The
results may provide the useful interpretation of clinical ST abnormalities in IHD.
|
|
| [dm-wei-04:2007] |
Motoki Sakai and Daming Wei. Detection of Electrocardiogram Mixed
in Electroencephalogram by Stationarization. International Journal of Bioelectromagnetism, 9(2):61-62, 2007. |
|
A semi-automatic algorithm is proposed for construction of personalized heart
model from Magnetic Resonance Imaging (MRI) images, emphasizing on applications
to cardiac electrophysiological simulation. The physiological characterizations
of personalized heart models were set in the same way as the Wei- Harumi model.
For validation, 12-lead electrocardiograms(ECG) were simulated with a model of
normal heart. The results show good agreement with clinical findings. This study
suggests a new direction of electrocardiological forward problem and application in
whole-heart modeling.
|
|
| [dm-wei-05:2007] |
Shin Hasegawa, Hidetaka Funayama, and Daming Wei. A Virtual
Reality Simulating Catheter Manipulations. International Journal of Bio-
electromagnetism, 9(2):125-126, 2007. |
|
Signals of Electroencephalogram (EEG) are usually contaminated by signals of Electrocardiogram
(ECG) during measurement. Till now, the ECG mixed in EEG is
removed as artifacts; however, in this paper we proposed a method to extract the
ECG component for medical diagnostics. Stationarization method is applied to extract
ECG signals. The ECG signals are extracted by Stationarizationa, and then
averaged as resultant signals. This method requires no more ECG electrodes but
only electrodes for EEG detection. A simulation shows the accuracy of our method
is over 90 the signal-noise ratio (SNR) is sufficiently high.
|
|
| [dm-wei-06:2007, zhuxin-03:2007] |
Xin Zhu, Daming Wei, and Osamu Okazaki. Computer
simulation of Electrophysiology Study based on whole-heart models.
International Journal of Bioelectromagnetism, 9(2):122-124, 2007. |
|
Computer simulation of Electrophysiology Study (EPS) is realized by employing
pacing protocols in EPS with the Wei-Harumi model. Intracardiac electrograms induced
by typical pacing protocolsincluding the basic interval measurement, atrial
extrastimulus pacing, ventricular extrastimulus pacing, incremental atrial pacing,
and incremental ventricular pacing are successfully reproduced with a model of
WPW syndrome. The tests of electrophysiological properties of cardiac tissues, such
as the determination of the refractory period, induction of Wenckebach rhythms,
and induction and termination of supraventricular tachycardias, are successfully
simulated and the simulation results agree with clinical findings. This study demonstrates
the feasibility and reliability of the computer simulation of EPS based on the
whole-heart model. Index Terms-Computer simulation, electrophysiology study
(EPS), whole-heart model, programmed electrical stimulation
|
|
| [dm-wei-07:2007, wenxi-01:2007, zhuxin-01:2007] |
Wenxi Chen, Xin Zhu, Tetsu Nemoto,
Kei ichiro Kitamura, Kayo Sugitani, and Daming Wei. Unconstrained monitoring
of long-term heart and breath rates during sleep. Physiological Measurement, 29(2):N1-N10, February 2008. |
|
An unconstrained method for the long-term monitoring of heart and breath rates
during sleep is proposed. The system includes a sensor unit and a webbased network
module. The sensor unit is set beneath a pillow to pick up the pressure variations
from the head induced by inhalation/exhalation movements and heart pulsation
during sleep. The measured pressure signal was digitized and transferred to a remote
database server via the network module. A waveletbased algorithm was employed
to detect the heart and breath rates, as well as body movement, during sleep. The
overall system was utilized for a total 6 month trial operation delivered to a female
subject. The profiles of the heart and breath rates on a beat-by-beat and daily
basis were obtained. Movements during sleep were also estimated. The results show
that the daily average percentage of undetectable periods (UPs) during 881.6 sleep
hours over a 180 day period was 17.2%. A total of 89.2% of sleep hours had a UP of
not more than 25%. The profile of the heart rate revealed a periodic property that
corresponded to the female monthly menstrual cycle. Our system shows promise
as a long-term unconstrained monitor for heart and breath rates, and for other
physiological parameters related to the quality of sleep and the regularityof the
menstrual cycle. |
|
| [wenxi-02:2007] |
Peng Ce, Xu Qiujing, Wan Baikun, and ChenWenxi. Pathological Voice
Classi cation Based on Features Dimension Optimization. Transactions of
Tianjin University, 13(6):456-461, 2007. |
|
The classification of pathological voice from healthy voice was studied based upon 27
acoustic features derived from a single sound signal of vowel 'a:'. First the feature
space was transferred to reduce the data dimension by principle componenl analysis
(PCA). Then the voice samples were classified according to fhe reduced PCA
param eters by support vector machine (SVM) using radiaI basis function (RBF) as
a kerneI function. Meanwhile, bv changing the ralio of opposite class samples, the
accuracy under diferent features combinations was tested. Experimental data were
provided by the voice database of Massachusetts Eye and Ear Infirmary (MEEI) in
which 216 vowel 'a:' samples were collected from subjects of healthy and pathological
cases, and tested with 5 fold cross validation method. The result shows
the positive rate of patholoqicaI voices was improved from 92% to 98% through
the PCA method. STD, Fatr, Tasm, NHR, SEG, and PER are pathology sensitive
features in illness detection. Using these sensitive features the accuracy of detection
of pathological voice from healthy voice can reach 97% .
|
|
| [wenxi-03:2007] |
PENG Ce, XIONG Yi, CHEN Wenxi, and WAN Baikun. Optimization
and Selection of Feature Parameters in Dysphonia Recognition. Chinese
Journal of Biomedical Engineering, 26(5):675-679, Oct 2007. |
|
In order to improve the performance of dysphonia recognition, 27 common used original
acoustic feature parameters were optimized and analyzed by using the method
of primary components analysis (PCA). The performances of PCA with only a
few primary components and in
uenced results with changing component numbers
were investigated. In this essay 9 optimum feature parameters were selected from
27 original parameters by using orthogonal layout based on their sensitivities in
reecting the voice disorder information, and then nearly the same corrective classification rate of dysphonia recognition was obtained. The optimized rates given
by two methods of primary component analysis and orthogonal layout are 97.23%
and 98.10% respectively, much higher than the rate of 92.10% which was got by
using the total 27 original acoustic feature parameters without optimization. The
results showed that two thirds of 27 original feature parameters could not re
ect the
main voice disorder characteristics. The higher performance of dysphonia recognition
was achieved by using fewer optimized feature parameters which contains the
most information of voice disorders. |
|
| [wenxi-04:2007] |
Wenxi CHEN, Ce PENG, Xin ZHU, Baikun WAN, and Daming WEI.
SVM-based Identification of Pathological Voices. Proc. of the 29th Annual
International Conference of the IEEE Engineering in Medicine and Biology
Society (EMBC07), pages 3786 - 3789, Aug 2007. |
|
This paper proposed a support vector machine (SVM) based classification method
to identify diversi ed pathological voices. Sound signals were sampled from the pronunciation
of a vowel `a' vocalized by 214 subjects, including 181 patients suffered
from various dysphonias (such as polypoid degeneration, adductor spasmodic dysphonia,
vocal fatigue, vocaltremor, vocal fold edema,hyperfunction, and erythema),
and 33 healthy subjects. 25 acoustic parameters were calculated from the sampled
data foreach subject. The original acoustic dataset was first transformed via principal
component analysis (PCA) method into a new feature space. To learn the
identification boundary for healthy and pathological voices, a soft-margin SVM and
three kinds of kernels were examined. The results under different combination of
parameters and kernels were investigated. The effectiveness of SVM-based approach
seems to be promising in the application of pathological voice identification. |
Refereed Proceeding Papers
| [dm-wei-08:2007] |
Shin Hasegawa, Hidetaka Funayama, and Daning Wei. A Shader for
Virtual X-ray Imaging. In Toshiaki Miyazaki, Incheon Paik, and Daming
Wei, editors, 7th IEEE International Conference on Computer and
Information Technology, pages 528-533, IEEE Computer Society Press. |
|
A virtual reality environment to visualize and manipulate catheter-based electrophysiology
study and catheter ablation is under development in our lab.
This paper presents a work in developing a Shader for Virtual X-Ray Imaging.
One of main technical issues is how to visualize the motion of catheters
within a 3D heart model as actual X-ray camera does. This paper describes an
application of novel shader technique for visualizing the virtual X-ray images
in computer graphics. A programmable shader is developed to calculate thickness
of the three-dimensional surface model of internal organs (bone, muscle,
lung and etc) and generate the virtual X-ray images in realtime. The experimental
results show that the shader can be expected a convenient tool in the
development of the virtual X-ray monitor.
|
|
| [dm-wei-09:2007, wenxi-05:2007] |
Hiroyuki Ishita, Motoki Sakai, Jin'eiWatanabe, Wenxi
Chen, and Daming Wei. Development of P300 Detection Algorithm for
Brain Computer Interface in Single Trial. In Toshiaki Miyazaki, Incheon
Paik, and Daming Wei, editors, 7th IEEE International Conference on
Computer and Information Technology (CIT'07), pages 1100-1105,
DOctober 2007, IEEE Computer Society Press. |
|
This paper proposed a combinational method to estimate and discriminate the
P300 component. The Kalman filter and the wavelet transformation were used
to estimate the P300 component and PCA and three discrimination methods;
linear discrimination analysis, Mahalanobis distance, and Bayes' theorem, were
used to discriminate the estimated P300 from single trial. The results show the
effectiveness of the combinational technique in discrimination. The combination
of wavelet transformation and a linear discrimination analysis can perform
discrimination in the highest accuracy and the fastest processing speed.
|
|
| [dm-wei-10:2007, wenxi-06:2007] |
Bofeng Zhang, Takehiro Kanno, Wenxi Chen,
Gengfeng Wu, and Daming Wei. Walking Stability by Age - A Feature
Analysis Based on a Fourteen-Linkage Model. In Toshiaki Miyazaki,
Incheon Paik, and Daming Wei, editors, 7th IEEE International Con-
ference on Computer and Information Technology (CIT'07), pages
45-50, IEEE Computer Society Press. |
|
More and more researchers have been interested in walking analysis for health
management of elderly people. Before understanding pathological gait, it is
necessary to understand normal gait, since this provides a quantitative standard
to judge or evaluate the gait of a patient. A starting point to do this is to
study the relationship between walking features and ages. For this purpose,
this paper proposes a walking model called Fourteen-Linkage Walking (FLW)
model to detect some useful features relative with age from 21 to 65 year old.
The features of walking stability are then defined and extracted based on the
FLW model. Two kinds of stability features, footprint features and walking
cycle features, are researched in this paper. To evaluate the walking pattern,
a new concept, stability coefficient, is suggested. Our results show that the
footprint and walking cycle features have close correlation with ages.
|
|
| [dm-wei-11:2007, wenxi-07:2007, zhuxin-04:2007] |
Ce Peng, Wenxi Chen, Xin Zhu,
Baikun Wan, and Daming Wei. Pathological Voice Classification Based
on a Single Vowel's Acoustic Features. In Toshiaki Miyazaki, Incheon
Paik, and Daming Wei, editors, 7th IEEE International Conference on
Computer and Information Technology (CIT'07), pages 1106-1110,
October 2007, IEEE Computer Society Press. |
|
This research focuses on the classification of pathological voice from healthy
voice based upon 30 acoustic features derived from a single sound of vowel /a/.
The method includes two steps. The first is the feature space transformation and
data dimension reduction based on PCA. The second step is the classification
of transformed features using support vector machine (SVM). The method was
validated with a sound database provided by the Massachusetts Eye and Ear
Infirmary (MEEI). 216 data files, collected from an identical phoneme vowel /a/
from subjects of healthy and pathological cases, were used for examination.
The original 30 acoustic features and the transformed features derived with
PCA were modeled by the SVM classifier using the radial basis function (RBF)
as a kernel function. The deviation residual (DR) is employed as the index
for performance evaluation. In the 5 fold cross-validation, the results show
that the pathological cases suffered from various diseases were detected with
classification rates of up to 98.1%, while the sensitivity and specificity were
92.5% and 99.4%, respectively. This preliminary result suggests that the highly
promising feasibility of the detection of mental and physical status through
analyzing a single tone of voice.
|
|
| [dm-wei-12:2007] |
Kunio Takahashi and Daming Wei. Development of Digital Image Surface
And its Application to Derived 12-lead ECG. In Toshiaki Miyazaki,
Incheon Paik, and Daming Wei, editors, 7th IEEE International Con-
ference on Computer and Information Technology, pages 1122-1126,
October 2007, IEEE Computer Society Press.
|
|
The "image surface" is a data collection of spatial vectors that reflect
relationship between heart vector and measured electrocardiograms, supposing the
heart source is a fixed dipole source. For long, the Frank image surface has been
used. However, since the Frank model represents an average model of western
population, it may not fit other populations like Japanese, and therefore may
affect the accuracy of applications In this study, to improve the accuracy of the
derived 12-lead ECG, we developed the digital image surface based on the personalized
torso models constructed from MRI images. The boundary element
method was used to calculate the values of digital image surface by applying
electrical current dipole source on the torso- heart model. Further, the valises
of the digital image surface for eight subjects were averaged as a representation
of typical models of Japanese population. As an application, derived 12-lead
ECG is obtained based on the digital image surface and the results is compared
with those based on the Frank image surface. The results show that the digital
image surface can get better accuracy than the Frank image surface.
|
|
| [dm-wei-13:2007, wenxi-08:2007] |
Akira Sasaki, Kazuaki Yamauchi,Wenxi Chen, Michael
Cohen, Daming Wei, and Zixue Cheng. Innovative Mobile Phone Services
Based on Next Generation Infrastructure in Japan - A Survey. In
Toshiaki Miyazaki, Incheon Paik, and Daming Wei, editors, 7th IEEE
International Conference on Computer and Information Technology
(CIT'07), pages 491-496, October 2007, IEEE Computer Society Press.
|
|
In this paper, we review current mobile phone technology and market in Japan
in various fields. We also investigate next-generation mobile phone infrastructure
and its innovative services, describing how future mobile infrastructure
works by introducing some cutting-edge technology differing from the current
mobile infrastructure. We explain why new services such as CGM (Communication
Generated Market) content and media type content are available in
the future mobile network. New services are based upon the advanced infrastructure
built-into next generation mobile phones. Because of advancement of
hardware specifications and new technology, features of mobile phone terminals
will evolve drastically from 2007 through 2010 and our daily lives will also be
altered accordingly.
|
|
| [dm-wei-14:2007, wenxi-09:2007] |
Wenxi CHEN, Ce PENG, Xin ZHU, Baikun WAN, and
Daming WEI. SVM-based Identification of Pathological Voices. In Proc.
of the 29th Annual International Conference of the IEEE Engineering
in Medicine and Biology Society (EMBC07), pages 3786 - 3789, Lyon,
August 2n007, IEEE Engineering in Medicine and Biology Society.
|
|
This paper proposed a support vector machine (SVM) based classification
method to identify diversified pathological voices. Sound signals were sampled
from the pronunciation of a vowel 'a' vocalized by 214 subjects, including 181
patients suffered from various dysphonias (such as polypoid degeneration, adductor
spasmodic dysphonia, vocal fatigue, vocal tremor, vocal fold edema, hyperfunction, and erythema), and 33 healthy subjects. 25 acoustic parameters
were calculated from the sampled data for each subject. The original acoustic
dataset was first transformed via principal component analysis (PCA) method
into a new feature space. To learn the identification boundary for healthy and
pathological voices, a soft-margin SVM and three kinds of kernels were examined.
The results under different combination of parameters and kernels were
investigated. The effectiveness of SVM-based approach seems to be promising
in the application of pathological voice identification.
|
|
| [dm-wei-15:2007, zhuxin-05:2007] |
Xin Zhu, Osamu Okazaki, and Daming Wei. The utility
of whole-heart model for the computer simulation of intracardiac
electrogram. In Masaaki Satou, editor, Proceedings of the 46th Annual
Conference of Japanese Society for Medical and Biological Engineering
(in Japanese), page 120, Sendai, April 2007, Japanese Society for Medical
and Biological Engineering. Japanese Society for Medical and Biological
Engineering.
|
|
In clinical practice, the strategy of catheter ablation is designed based on the
excitation propagation in the heart discovered within the cardiac Electrophysiological
study. On the other hand, the computer simulation is an important
method for testing the hypothesis on the cardiac arrhythmias' mechanisms.
In this research, through simulating the excitation propagation based on the
heart model in a virtual platform, the Wenckbache's rhythm, decremental conduction,
and reentry were reproduced for the possible implementations in the
training of young physicians and discovering the mechanisms of arrhythmias.
|
|
| [dm-wei-16:2007] |
Masako Kashiwagi, Naoko Kitami, and Wei Daming. Biometric Authentication
using electrocardiogram: a development of algorithm. In
Masaaki Satou, editor, Proceedings of the 46th annual conference of
Japanese Society for Medical and Biological Engineering(in Japanese),
page 233, Sendai, April 2007, Japanese Society for Medical and Biological
Engineering.
|
|
This study investigates the feasibility for biological authentication using the
electrocardiogram (ECG). A difference to other existing researches is that this
study is conducted for 1-to-1 identification then other studies using 1-to-n purpose.
The multivariate analysis is used based on a ECG database, and the
specificity and specificity are discussed.
|
|
| [dm-wei-17:2007] |
Kunio Takahashi, Masatugu Fujita, Hiroshi Yoshikawa, and Daming
Wei. Construction of the Shape Model of Heart from MRI. In Masaaki
Satou, editor, Proceedings of the 46th annual conference of Japanese
Society for Medical and Biological Engineering(in Japanese), page 233,
Sendai, April 2007, Japanese Society for Medical and Biological Engineering.
|
| [wenxi-10:2007] |
T. Abe, W. Chen, T. Togawa, T. Maeda, and M. Arai.
Development of a Mobile Phone-based Blood Pressure Monitor.
In Proc. of the 46th Annual Conference of Japanese Society
for Medical and Biological Engineering, pages PS1-10-7,
http://www.toptour.co.jp/conv/3211/mbe2007/, April 2007. |
|
This paper is aimed at the development of a high-precision, noninvasive, continuous
blood pressure monitor using pulse arrival time (PAT). A continuous
putative function of systolic blood pressure was realized using Electrocardiogram
(ECG) and the pulse signals for calculating the pulse wave are obtained
from electrodes that are attached to both hands and a photoplethysmographic
sensor attached to the tip of the finger and the hand. First, noise such as drift,
electromyogram, and hum noise is reduced using a notch filter and a bandpass
filter. Next, the QRS wave peak of the ECG is detected. In parallel with QRS
wave peak detection, the leading edge of the pulse is detected. The interval
between these two points is computed as the PAT. Then, the signal most correlated
to change in blood pressure is selected. In this way, systolic blood pressure
is computed continuously and precisely. |
|
| [wenxi-11:2007] |
Satoshi Oda, Wenxi Chen, and Masumi Kitazawa. BREW Implementation
of a Mobile Phone-based Monitor for Women's Healthcare. In Proc.
of the International Special Topic Conference on Information Technology
Applications in Biomedicine 2007 jointly held with Ubiquitous Healthcare
2007 (ITAB'07), pages 288-291, http://www.itab2007.org/, Nov 2007. |
|
Abstract Implementation of a mobile phone-based monitor for women's
healthcare is described in this paper. The implementation was realized in the
BREW programming language, and used a KDDI mobile phone and a tiny
wearable body temperature sensor. The temperature inside clothing during
sleep is measured continuously and automatically by a wearable temperature
sensor device. The temperature data are accumulated and transmitted a specific
database server via mobile phone. The BREW application acquires the
data and supplies health care information, such as a one-night temperature
profile animation review for sleep quality evaluation. Menstrual cycle stage
estimation and a diary for personal health management were developed and
implemented. These implementations enhanced the usability and functionality
of the women's healthcare monitor and provided many advantages to the
management system. |
|
| [wenxi-12:2007] |
T. Abe, W. Chen, T. Togawa, T. Maeda, and M. Arai. Development
of a Mobile Phone-based Beat-by-Beat Sphygmomanometer. In Proc. of
the International Special Topic Conference on Information Technology
Applications in Biomedicine 2007 jointly held with Ubiquitous Healthcare
2007 (ITAB'07), pages 285-287, http://www.itab2007.org/, Nov 2007. |
|
This paper is aimed at the development of a high-precision, noninvasive, continuous
blood pressure monitor using pulse arrival time (PAT). A continuous
putative function of systolic blood pressure was realized using Electrocardiogram
(ECG) and the pulse signals for calculating the pulse wave are obtained
from electrodes that are attached to both hands and a photoplethysmographic
sensor attached to the tip of the finger and the hand. First, noise such as drift,
electromyogram, and hum noise is reduced using a notch filter and a bandpass
filter. Next, the QRS wave peak of the ECG is detected. In parallel with QRS
wave peak detection, the leading edge of the pulse is detected. The interval
between these two points is computed as the PAT. Then, the signal most correlated
to change in blood pressure is selected. In this way, systolic blood pressure
is computed continuously and precisely. |
|
| [wenxi-13:2007] |
W. Chen, T. Togawa, and M. Kitazawa. Estimation of Menstrual
Cyclic Property Using Body Temperature during Sleep.
In Proc. of the 46th Annual Conference of Japanese Society
for Medical and Biological Engineering, pages PS1-18-10,
http://www.toptour.co.jp/conv/3211/mbe2007/, April 2007. |
| An HMM-based method is proposed to estimate biphasic property in female
menstrual cycle. A tiny device is developed to measure skin temperature change
during sleep. Data are collected from 30 female participants for 6 months. Raw
data are preprocessed to remove obvious outliers and clamped between 34 and
42 degree Celsius. A two hidden states HMM-based algorithm was applied to
estimate the biphasic property in menstrual cycle. The results showed that the
number of correctly detected menstrual cycle is 159 among 173 in 30 participants
during 6 months. Overall sensitivity reaches 92.0%. |
|
| [wenxi-14:2007] |
Takehiro Kanno, Wenxi Chen, and Masumi Kitazawa. Development
of i-appli for Women's Health Information Management System.
In Proc. of the 7th IEEE International Conference on Computer
and Information Technology (CIT'07), pages 411-16, http://www.uaizu.ac.jp/conference/cit07/ Oct 2007. |
|
The purpose of this paper is to develop a mobile phone application for women's
health monitoring and information management. This mobile phone application
is targeted on FOMA900 series mobile phones released by NTT DoCoMo and
known as i-appli. A wearable temperature logger device is used to measure body
surface temperature during sleep automatically. Collected temperature data
are transmitted to a specific database server via mobile phone. These data are
used to calculate women's menstrual cycle, estimate next ovulation period, and
supply self healthcare services. This i-appli realized many innovative features,
such as 'My Stage', 'Oral Care', 'My Diary' and so forth, based on the above
system for women daily healthcare. Twenty-two women tried out the i-appli for
two months. The result from a questionnaire survey showed that most of the trial users feel comfortable and informative in helping their daily health care
and information management. |
Book
| [dm-wei-18:2007] |
Toshiaki Miyazaki, Incheon Paik, and Daming Wei. The Proceedings
of the IEEE Seventh International Conference on Computer and Information
Technology. Proceedings of IEEE CIT. The IEEE Computer Society, Los
Alamitos, 2007. |
Grants
| [wenxi-15:2007] |
Wenxi Chen. Development of a MCBY IC for Bio-information System
and Mobile Phone Application Kit, 2007. JST Promotion business using advanced technology`Modeling of Innovative Research Results' - co-researcher |
| [wenxi-16:2007] |
Wenxi Chen. Development of Wearable Sensor and Women Health Information
System, 2007. JST Research Program on Development of Innovative Technology - co-researcher |
| [wenxi-17:2007] |
Wenxi Chen. IT Samurai Camp in Aizu, 2007. MEXT Modern GP Program |
Academic Activities
| [dm-wei-19:2007] |
Daming Wei, Oct. 2007. General Chair, IEEE ICT 2007 |
| [wenxi-18:2007] |
Wenxi Chen, Nov/8-11 2007. PC member of the International Special Topic Conference on Information Technology Applications in Biomedicine 2007 (ITAB 2007), Tokyo, Japan |
| [wenxi-19:2007] |
Wenxi Chen, Oct/16-19 2007. PC member of the 7th International Conference on Computer and Information Technology (CIT2007), PC member of the 6th International Conference on Bioelectromagnetism (ICBEM2007), Aizu-wakamatsu, Japan |
Patents
| [wenxi-20:2007] |
Masumi; Togawa Tatsuo Chen, Wenxi; Kitazawa. MENSTRUAL CYCLE
ESTIMATION DEVICE AND METHOD, April 2007. |
Ph.D and Others Theses
| [dm-wei-20:2007] |
Hiroyuki Ishita. A Virtual Keyboard Controlled by μ-Rhythm and
Steady-State Visual Evoked Potentials, University of Aizu, 2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-21:2007] |
Naoko Kitami. Biometric Authentication using Electrocardiogram:
Temporal Effect Investigated with Long-term ECG data, University of Aizu,
2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-22:2007] |
Zhaomin Zhang. Ph.D. Desertation: Telehealthcare via Mobile Networking:
A Multimedia Teleconference System and a Feasibility Study for ECGbased
Security Solution, University of Aizu, 2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-23:2007] |
Masaki Igarashi. An Experimental Study of Media Streaming Multicast,
University of Aizu, 2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-24:2007] |
Akira Oyamada. A Development of a Digital Pen-based Electronic
Medical Record Application for Doctor's Home Visiting Service, University of
Aizu, 2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-25:2007] |
Syuji Sato. An Implementation of Automatic Segmentation for CT
Images of Organ, University of Aizu, 2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-26:2007] |
Junya Shinjo. An Image Correction Algorithm for Three-dimensional
Vision, University of Aizu, 2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-27:2007] |
Yuki Yoshida. A Study of Biometric Identi cation Using Ambulatory
Electrocardiogram for Car Applications, University of Aizu, 2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-28:2007] |
Hiroyuki Ishita. A Virtual Keyboard Controlled by μ-Rhythm and
Steady-State Visual Evoked Potentials, University of Aizu, 2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-29:2007] |
Naoko Kitami. Biometric Authentication using Electrocardiogram:
Temporal Effect Investigated with Long-term ECG data, University of Aizu,
2007. Thesis Advisor: Prof. Daming Wei |
| [dm-wei-30:2007] |
Zhaomin Zhang. Ph.D. Desertation: Telehealthcare via Mobile Networking:
A Multimedia Teleconference System and a Feasibility Study for ECGbased
Security Solution, University of Aizu, 2007. Thesis Advisor: Prof. Daming Wei |
| [wenxi-21:2007] |
Sho Hirano. Discrimination Between Two Classes of Left and Right
Hand Movement by Mu Rhythm, University of Aizu, 2007. Undergraduate student |
| [wenxi-22:2007] |
Kazuki Endo. Estimation of Electrode Position from CT Images of
Torso for Simulation of Electrocardiograms, University of Aizu, 2007. Undergraduate student |
| [wenxi-23:2007] |
Takuya Ishii. Development of an SSVEP-Based Virtual Keyboard,
University of Aizu, 2007. Undergraduate student |
| [wenxi-24:2007] |
Haruna Oshikiri. Frame Model Construction with CT Image, University
of Aizu, 2007. Undergraduate student |
| [wenxi-25:2007] |
Takehiro Kanno. Development of a Body Temperature Monitor Based
on Near Field Communication Technology and a Mobile Phone, University of
Aizu, 2007. Master student |
| [wenxi-26:2007] |
Yoshimi Otoba. Heartbeat Synchronize Three-dimensional Dynamic
Viewing of MRI Images Based on Volume Rendering, University of Aizu, 2007. Undergraduate student |
Others
| [dm-wei-31:2007] |
Nikkei Economy News. News article: A successful development on Kango-Pen (a didital pen application to homecare service) by QRD corporation, a venture company Identified by Univeristy of Aizu Unversity (CEO: Prof. Daming Wei), 2007/4/13 |
| [dm-wei-32:2007] |
Nikkei Industry News. News article: A successful development on Kango-Pen (a didital pen application to homecare service) by QRD corporation, a venture company Identified by Univeristy of Aizu Unversity (CEO: Prof. Daming Wei), 2007/4/23 |
| [dm-wei-33:2007] |
Fukushima Minyu. News article: A successful development on Kango-Pen (a didital pen application to homecare service) by QRD corporation, a venture company Identified by Univeristy of Aizu Unversity (CEO: Prof. Daming Wei), 2007/3/3 |
