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Lim K.M.,Kumoh Institute of Technology | Yang S.-H.,Kyungpook National University | Shim E.B.,Kangwon National University
IET Systems Biology | Year: 2012

This work reviews the main aspects of human bioenergetics and the dynamics of the cardiovascular system, with emphasis on modelling their physiological characteristics. The methods used to study human bioenergetics and circulation dynamics, including the use of mathematical models, are summarised. The main characteristics of human bioenergetics, including mitochondrial metabolism and global energy balance, are first described, and the systemic aspects of blood circulation and related physiological issues are introduced. The authors also discuss the present status of studies of human bioenergetics and blood circulation. Then, the limitations of the existing studies are described in an effort to identify directions for future research towards integrated and comprehensive modelling. This review emphasises that a multi-scale and multi-physical approach to bioenergetics and blood circulation that considers multiple scales and physiological factors are necessary for the appropriate clinical application of computational models. © 2012 © The Institution of Engineering and Technology. Source

Yoon E.-J.,Kyungpook National University | Jeon I.-S.,Kumoh Institute of Technology | Yoo K.-Y.,Kyungpook National University
IEICE Transactions on Information and Systems | Year: 2011

Autonomous objects represent active database objects which can be distributed over the Internet. This paper proposes a robust authentication scheme for the remote autonomous object based on AES (Advanced Encryption Standard) symmetric cryptosystem. Compared with related schemes, the proposed scheme not only resists various security attacks but also provides computation and communication efficiency. © 2011 The Institute of Electronics, Information and Communication Engineers. Source

Yoon E.-J.,Kyungpook National University | Shin Y.-N.,Korea Information Security Agency | Jeon I.-S.,Kumoh Institute of Technology | Yoo K.-Y.,Kyungpook National University
IETE Technical Review (Institution of Electronics and Telecommunication Engineers, India) | Year: 2010

The session initiation protocol (SIP) is a powerful signaling protocol that controls communication on the Internet, establishing, maintaining, and terminating the sessions. The services that are enabled by SIP are equally applicable in the world of mobile and ubiquitous computing. In 2009, Tsai proposed an efficient nonce-based authentication scheme for SIP. The current paper, however, demonstrates that Tsai′s authentication scheme is still vulnerable to offline password guessing attacks, Denning-Sacco attacks, and stolen-verifier attacks, and does not provide perfect forward secrecy. We also propose a new secure and efficient authentication scheme based on the elliptic curve discrete logarithm problem for SIP in order to overcome such security problems. Copyright © 2010 by the IETE. Source

Shin D.,Kumoh Institute of Technology | Kim B.,National Science Foundation
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) | Year: 2010

This paper presents a new type of optical encoder which generates a quadrature signal with resolution of 1/8 wavelength of the laser source. The sensor is composed of two diffraction gratings with the period of 4μm and 6μm, which has step difference 86nm, so that the signals generated from two diffraction gratings have about 90° phase difference. The simulation and experiment results for displacement measurement show the validity of the proposed optical encoder. Copyright © 2010 by ASME. Source

Lim K.M.,Kumoh Institute of Technology | Jeon J.W.,Kangwon National University | Gyeong M.-S.,Kangwon National University | Hong S.B.,Kangwon National University | And 4 more authors.
IEEE Transactions on Biomedical Engineering | Year: 2013

A bipolar mini-ECG for ubiquitous healthcare (U-ECG) has been introduced, and various studies using the U-ECG device are in progress. Because it uses two electrodes within a small torso surface area, the design of the U-ECG must be suitable for detecting ECG signals. Using a 3-D model of cardiac electrophysiology, we have developed a simulation method for identifying the optimal placement of U-ECG electrodes on the torso surface. We simulated the heart-torso model to obtain a body surface potential map and ECG waveforms, which were compared with the empirical data. Using this model, we determined the optimal placement of the two U-ECG electrodes, spaced 5 cm apart, for detecting the P, R, and T waves. The ECG data, obtained using the optimal U-ECG placement for a specific wave, showed a clear shape for the target wave, but equivocal shapes for the other waves. The present study provides an efficient simulation method to identify the optimal attachment position and direction of the U-ECG electrodes on the surface of the torso. © 1964-2012 IEEE. Source

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