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检索条件"机构=Interdisciplinary Program in Biomedical Engineering"

共 468 条记录，以下是431-440 订阅

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Hardware design & compression issues in compact Bluetooth enabled wireless telecardiology system

Hardware design & compression issues in compact Bluetooth en...

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International Conference on Broadband Networks (BroadNets)

作者： Jong Min Choi R.S.H. Istepanian A. Alesanco H. Wang Interdisciplinary Program in Biomedical Engineering Seoul National University Seoul South Korea MINT Research Centre Kingston University UK Communication Technologies Group (GTC) University of Zaragoza Zaragoza Spain

Mobile telecardiology has been considered one of the successful m-health applications. Recently, the rapid development in mobile technologies enabled corresponding advances in mobile telecardiology applications. The compression issues of Bluetooth enable mobile telecardiology system. We address the relevant hardware design issues and performance

关键词： Hardware Bluetooth Electrocardiography Telemedicine Network servers Real time systems Remote monitoring Mobile handsets Roaming Protocols

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The ECG measurement in the bathtub using the insulated electrodes

The ECG measurement in the bathtub using the insulated elect...

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Conference Proceedings - 26th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2004

作者： Lim, Yong Kyu Kim, Ko Keun Park, Kwang Suk Med. and Biol. Engineering Major Interdisciplinary Program Seoul National University Department of Biomedical Engineering College of Medicine Seoul National University

The ECG recording in the bathtub was studied using insulated electrode. Prior studies of the ECG recording in the bathtub used conductive electrodes having some problems such as the possibility of the electric shock and sensitivity to contamination of the electrode surfaces. The insulated electrodes were made of copper plate coated with PET film. The electrodes were attached on bathtub at both sides of the chest High-input-impedance amplifier was designed to amplify ECG signal sensed by insulated electrodes of high impedance. The recorded signals in this study were noisier than those recorded with conventional conductive electrodes. But the R peaks in the recorded signals were large enough to be auto-detected. Further study will improve SNR by reducing of power line noise and common-mode noise.

关键词： Electrocardiography

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The electrically non-contacting ECG measurement on the toilet seat using the capacitively-coupled insulated electrodes

The electrically non-contacting ECG measurement on the toile...

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Conference Proceedings - 26th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2004

作者： Kim, Ko Keun Lim, Yong Kyu Park, Kwang Suk Med. and Biol. Engineering Major Interdisciplinary Program Seoul National University Korea Republic of Department of Biomedical Engineering College of Medicine Seoul National University Korea Republic of

The studies of ECG measurement on the toilet seat have been performed specifically for the ubiquitous health care. Instead of the mainly used dry electrodes having several problems such as the electrical safety or the environmental stability, we used the capacitively-coupled insulated electrodes, which were composed of the Cu plate and the PTFE film for the measurement. The bio-signal sensed with the insulated electrodes was measured through the ultra-high input impedance system including OPA111 having the common mode impedance of 1014 Ω. As the result of measuring the signal, with the electrical ground on the neck or the hand, the R-peaks were detected very positively. However, without the electrical ground on the body, we could detect the heartbeat signal, a kind of the motion artifacts by the variation of the blood vessel volume. It seems that this heartbeat signal can be also used as the important parameter like the R-peaks for the HRV (heart rate variability) analysis. In addition, it is thought that, without the directly electrical ground, the R-peak detection will be possible by the improvement of the SNR with the active common canceling system.

关键词： Electrocardiography

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A comparison of the perturbation analysis between praat and computerize speech Lab 8

A comparison of the perturbation analysis between praat and ...

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8th International Conference on Spoken Language Processing, ICSLP 2004

作者： Choi, Jong Min Hah, Jeong-Hun Sung, Myung-Whun Park, Kwang Suk Interdisciplinary Program in Medical and Biological Engineering Korea Republic of Department of Otorhinolaryngology Head and Neck Surgery College of Medicine Korea Republic of Department of Biomedical Engineering College of Medicine Seoul National University Korea Republic of

programs for the analysis of pathological voice data have been presented for the last few decades. Computerized Speech Lab (CSL) has been recognized as a standard in the field of pathological voice analysis. PRAAT is a new open program which is constantly being improved almost every week. CSL gives the "Voice disorders database" which was produced by Massachusetts Eye and Ear Infirmary. In this paper, we use PRAAT program for the analysis of voice data and compare the result of PRAAT with the result of CSL. We focus on the perturbation analysis on frequencies using several parameters like jitter, standard deviation of fundamental frequencies etc.

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Sleep Stage Scoring by EEG Spectral Information Based on Fuzzy Clustering Only

Sleep Stage Scoring by EEG Spectral Information Based on Fuz...

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The 4th ASRS Congress

作者： Jung-Su Oh Jin Woo Seo Byunghun Choi Do-Un Jeong Kwang-Suk Park Interdisciplinary Program-Biomedical Engineering Major Graduate School Seoul National University Interdisciplinary Program-Biomedical Engineering Major Graduate School Seoul National University Interdisciplinary Program-Biomedical Engineering Major Graduate School Seoul National University Department of Psychiatry and Behavioral Science Seoul National University College of Medicine and Division of Sleep Studies Seoul National University Hospital Department of Biomedical Engineering Seoul National University College of Medicine Seoul Republic of Korea

The quantity and quality of human sleep draw more attention as the society becomes more sophisticated. The unique and common method for evaluating human sleep is polysomnography (PSG) and it generates sleep architecture with functional variables. Sleep stages are nonuniform constituents of sleep architecture and each 30-second epoch should be scored accu-

关键词： EOG EMG Sleep Stage Scoring by EEG Spectral Information Based on Fuzzy Clustering Only Fuzzy

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Resorbable polymer-ceramic composites for orthopedic scaffold applications

Resorbable polymer-ceramic composites for orthopedic scaffol...

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28th International Conference on Advanced Ceramics and Composites

作者： Vaidyanathan, R. Hecht, B. Studley, A. Phillips, T. Calvert, P.D. Tellis, B. Coleman, A. Szivek, J. Advanced Ceramics Research Inc. 3292 E. Hemisphere Loop Tucson AZ 85706 University of Arizona Arizona Material Laboratories Tucson AZ 85712 Biomedical Engineering Interdisciplinary Program University of Arizona Tucson AZ 85712

In current state-of-the-art resorbable orthopedic implant materials, loss of strength occurs before substantial mass loss in the degradation process. Materials such as 1:1 PLA:PGA copolymers become too weak to carry any load long before significant amounts of bone have grown to replace the eroded prostheses. An alternative is a two-stage implant material that is both load bearing and osteoconductive;a property of a material to encourage bone already being formed, to lie closely to or adhere to its surface. To achieve this, an interpenetrating network of osteoconductive material and strong (but degradable) biocompatible material is needed. In comparison to conventional prosthesis or scaffold manufacturing routes, rapid prototyping (RP) techniques are an attractive means of fabricating these two-stage implants. A poly butylene terephthalate polymer blend scaffold with 150-300 urn diameter interconnected pores was built using RP and coated with a thin coating of tricalcium phosphate (TCP) or hydroxy apatite suspension in a polycaprolactone matrix. Tissue culture results showed that scaffolds with such thin coatings were more conducive to growth of the cells, perhaps due to a more open scaffold, where the cells can proliferate more easily compared to the other types. The interpenetrating combination of the two biodegradable materials was designed to allow rapid bone in-growth while providing support. This preliminary study validates our hypothesis that the RP process combined with thin coating of HA can tailor an implant to the needs of a specific patient.

关键词： Composite materials

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Development of A Remotely-Accessible Digital Polysomnography Using TCP/IP

Development of A Remotely-Accessible Digital Polysomnography...

引用

The 4th ASRS Congress

作者： Jin Woo Seo Byunghun Choi Kwang Suk Park Do-Un Jeong Interdisciplinary Program-Biomedical Engineering Major Graduate School Seoul National University Interdisciplinary Program-Biomedical Engineering Major Graduate School Seoul National University Department of Biomedical Engineering Seoul National University College of Medicine Department of Psychiatry and Behavioral Science Seoul National University College of Medicine and Division of Sleep Studies Seoul National University Hospital Seoul Republic of Korea

Despite that conventional polysomnography(PSG) is a very strong diagnostic tool for sleep disorders, there are some limitations. Among them, temporal and spatial limitations are very significant. They could be overcome by remotely-accessible digital PSG. We developed a digital PSG system for tele-monitoring patients overnight on physiological signals and behavior. The

关键词： Development of A Remotely-Accessible Digital Polysomnography Using TCP/IP

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Development of an integrated home telemedicine system

Development of an integrated home telemedicine system

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IEEE EMBS Asian-Pacific Conference on biomedical engineering 2003, APBME 2003

作者： Chun, Honggu Kim, Ki-Jung Kangl, Jae Min Kim, Hee Chan Interdisciplinary Program in Medical and Biological Engineering Major Seoul National University Seoul Korea Republic of Dept. of Biomedical Engineering College of Medicine Seoul National University Seoul Korea Republic of

ISBN: (纸本)0780379438

We developed an integrated home telemedicine system equipped with automatic diagnosis and consultation function for patients with chronic disease such as cardiac disease, respiratory disease, diabetes and hypertension. The system measures standard 12ch ECG, respiratory function, blood glucose level and noninvasive blood pressure (NIBP). The measured data were stored on the system and transmitted to the central server everyday through the internet. The system performed automatic diagnosis at every measurement and offered medical consultation to the patient If there was any abnormality in the diagnostic result, the system gave a real time alarm to the healthcare center for adequate teleconsultation or medical service. We have installed the developed system on an apartment for the performance evaluation and confirmed the possibility of the system as an effective tool for the telemedicine. © 2003 IEEE.

关键词： Electrocardiograms

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A home-based bedside monitoring system of ECG via bluetooth protocol

A home-based bedside monitoring system of ECG via bluetooth ...

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IEEE EMBS Asian-Pacific Conference on biomedical engineering 2003, APBME 2003

作者： Seo, Jin Woo Ryu, Myung Suk Park, Kwang Suk Jeong, Do-Un Interdisciplinary Program-Biomedical Engineering Major Graduate School Seoul National University Korea Republic of Advanced Biometric Research Center Seoul National University Korea Republic of Department of Biomedical Engineering Seoul National University College of Medicine Korea Republic of Dept. of Psychiatry Div. of Sleep Studies Seoul Nat'l Univ. College of Medicine and Hospital Korea Republic of

ISBN: (纸本)0780379438

Despite that ECG(electrocardiogram) provides substantial amount of information about a monitored patient, it has limitations when monitored remotely. In order to overcome long wire and channel interference problems of monitoring, wc used a certified Bluetooth Protocol and developed a home-based bedside ECG monitoring system. Bluetooth Protocol enabled the real-time transfer of ECG data via wireless communication with display and storage on PC(pcrsonal computer). We wore also able to retransmit the stored data to other site via TCP/IP. This system has clinical utility for unconstrained monitoring of ECG at bedside not only at home but also in hospital settings. © 2003 IEEE.

关键词： Electrocardiograms

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In vivo observation of blood echogenicity variation during a cardiac cycle on human carotid arteries

In vivo observation of blood echogenicity variation during a...

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IEEE Symposium (IUS) Ultrasonics

作者： Dong-Guk Paeng B.S. Kim MinJoo Choi R.Y. Chiao K.K. Shung Interdisciplinary Program of Biomedical Engineering Cheju National University Jeju South Korea Department of Biomedical Engineering University of Southern California Los Angeles CA USA GE Medical Systems Milwaukee WI USA

A cyclic variation of blood echogenicity from human iliac arteries in vivo was first observed using an intravascular 30 MHz ultrasound imaging device. Several studies have confirmed the temporal variation of the backscattered power during a flow cycle but they were all from in vitro experiments. In this paper, cyclic variation of echogenicity in vivo on human carotid arteries (7 males and 3 females) was observed from harmonic images of a GE LOGIQ 700 expert system with an M12L probe. Blood echogenicity increased at early systole, reaching a maximum at peak systole, and then decreased to be weak during diastole. Echogenicity during systole was about 40 to 60 % higher than that during diastole for all radial positions. The ratio of the maximum echogenicity during systole to the mean echogenicity during diastole was small at the center and near the vessel wall, and became large between them. The cyclic variation of blood echogenicity is thought to be due to erythrocyte aggregation enhancement by the combined effects of flow acceleration and shear rate during systole.

关键词： In vivo Blood Humans Carotid arteries In vitro Expert systems biomedical engineering biomedical imaging Ultrasonic imaging Acceleration

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