Optoelectronic stimulation of the brain using carbon nanotubes.

Mohy-Ud-Din, Zia,Woo, Sang Hyo,Kim, Jee Hyun,Cho, Jin Ho Pergamon Press [etc.] 2010 Annals of biomedical engineering Vol.38 No.11

<P>This paper presents the simulation results of a novel technique to stimulate the brain using a carbon nanotubes (CNT) based optically activated stimulator. This technique could be a promising alternative solution to overcome the limitations occurring in the conventional electrical stimulation of the brain and the newly developed opto-genetic stimulation. In this technique, the CNT stimulator, which generated an electrical current when exposed to light, was implanted in the brain. This current stimulated the nearby neurons to generate an action potential. The simulation results illustrated that a single-wall carbon nanotube of 50 nm2 size could stimulate a 40 μm2 area of the brain, whereas a multiwall carbon nanotube could cover a 12 μm2 area of the brain. Additionally, simulations were also performed to determine the optimal shape and appropriate coating material for commercial optical stimulators to maximize the stimulation efficacy in the brain.</P>

Polysomnography by ECG Telemetry System

Mohy-Ud-Din Zia,Woo Sanghyo,Changwook Kim,Junghyun Lee,Jangwoo Lee,Heejoon Park,Chulho Won,Euisung Chung,J. H. Cho 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7

Recently, the biotelemetry is become more and more popular and people and trying to get the maximum beneficent from it. In this regard we developed real ECG telemetry system have extremely low power consumption and the dimensions are 2.5 ㎝ by 3 ㎝. In this circuit ECG amplifier and transmitter are embedded on the single side PCB. This paper explain the method to use the 2-lead ECG signal in the recording of the dream time of a normal person by detecting the REM sleep time through the heart rate variability in sleep cycle to make the sleep studies easier and also a person can record his dream time in the home. In this way we are able to use the biotelemetry in the recording of the dream time remotely. This method is much easier than the conventional method of Polysomnography.

Effect of nitrogen doping and hydrogen confinement on the electronic properties of a single walled carbon nanotube

Bashir Mohi Ud Din Bhat,Jehangir Rashid Dar,Pratima Sen 한국탄소학회 2016 Carbon Letters Vol.17 No.-

This paper addresses the effect of dopants on the electronic properties of zigzag (8, 0) semiconducting single walled carbon nanotubes (SWCNTs), using extended H?ckel theory combined with nonequilibrium Green’s function formalism. Through appropriate dopant concentrations, the electronic properties of SWCNTs can be modified. Within this context, we present our ongoing investigation on (8, 0) SWCNTs doped with nitrogen. Quantum confinement effects on the electronic properties of the SWCNTs have also been investigated. The obtained results reveal that the electronic properties of SWCNTs are strongly dependent on the dopant concentration and modification of electronic structures by hydrogen confinement.

HEN Simulation of a Controlled Fluid Flow-Based Neural Cooling Probe Used for the Treatment of Focal and Spontaneous Epilepsy

( Zia Mohy Ud Din ),( Sang Hyo Woo ),( Wei Qun ),( Jee Hyum Kim ),( Jin Ho Cho ) 한국센서학회 2011 센서학회지 Vol.20 No.1

Brain disorders such as epilepsy is a condition that affects an estimated 2.7 million Americans, 50,000,000 worldwide, approximately 200,000 new cases of epilepsy are diagnosed each year. Of the major chronic medical conditions, epilepsy is among the least understood. Scientists are conducting research to determine appropriate treatments, such as the use of drugs, vagus nerve stimulation, brain stimulation, and Peltier chip-based focal cooling. However, brain stimulation and Peltier chip-based stimulation processes cannot effectively stop seizures. This paper presents simulation of a novel heat enchanger network(HEN) technique designed to stop seizures by using a neural cooling probe to stop focal and spontaneous seizures by cooling the brain. The designed probe was composed of a U-shaped tube through which cold fluid flowed in order to reduce the temperature of the brain. The simulation results demonstrated that the neural probe could cool a 7 mm2 area of the brain when the fluid was flowing atb a velocity of 0.55 m/s. It also showed that the neural cooling probe required 23 % less energy to produce cooling when compared to the Peltier chip-based cooling system.

Duodenum Identification Mechanism for Capsule Endoscopy

Woo, Sang Hyo,Mohy-Ud-Din, Zia,Cho, Jin Ho IEEE 2011 IEEE Transactions on Biomedical Engineering Vol.58 No.4

<P>The aim of this study is to implement a duodenum identification mechanism for capsule endoscopes because commercially available capsule endoscopes sometimes present a false negative diagnosis of the duodenum. One reason for the false negative diagnosis is that the duodenum is the fastest moving part within the gastrointestinal tract and the current frame rate of the capsule is not fast enough. When the capsule can automatically identify that it is in the duodenum, the frame rate of the capsule can be temporarily increased to reduce the possibility of a false negative diagnosis. This study proposes a mechanism to identify the duodenum using capacitive proximity sensors that can distinguish the surrounding tissue and transmit data using RF communication. The implemented capsule (D11 mm × L22 mm) was smaller than the commercially available capsule endoscopes, and power consumption was as low as 0.642 mW. Preexperiments were con ducted to select an appropriate electrode width in order to increase the signal-to-noise ratio (SNR), and in vitro experiments were con ducted to verify whether the implemented capsule could identify the duodenum within 3 s. The experiment showed that the identification rate of duodenum was 93% when the velocity of the capsule was less than 1 cm/s.</P>

Extraction Algorithm for the Feature of the Ringer’s Image

Changwook Kim,Z. Mohy-Ud-Din,Sangheon Lee,Sanghyo Woo,Junghyun Lee,Ilyong Park,Chulho Won,Jin-ho Cho 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7

When a patient is under the conditions of injecting ringer’s solution, nurses must carefully check the residual quantity of the ringer’s solution because if the nurses misse the exact time to change the ringer’s solution, sometimes dangerous moments can be occurs, such as influx of air bubbles could enter blood vessels or the blood could be regurgitated into the ringer. Therefore, it is necessary to develop a method to detect residual quantity of the ringer’s solution. In this paper, proposed method for detecting residual quantity of ringer's solution used k-NN (k-Nearst Neighbor) classifier. This algorithm utilized a CCD camera that was applied as a sensor to obtain the image of the ringer's bottle. As a result, the algorithm found the residual quantity of the ringer's solution automatically.

Ear Canal Insertable Size Wireless Transceiver for Hearing Aid

Woo, Sang-Hyo,Mohy-Ud-Din, Zia,Yoon, Young-Ho,Kim, Min-Kyu,Lee, Jyung-Hyun,Kim, Myoung-Nam,Cho, Jin-Ho The Korean Society of Medical and Biological Engin 2010 의공학회지 Vol.31 No.1

The aim of this study was to test the feasibility of a wireless transceiver that can be inserted into the ear canal. The wireless technology could minimize the cosmetic problems of patients, and it can be applied to binaural hearing aids for improving speech perception. In order to implement the ear canal insertable transceiver, simple finite-difference time-domain (FDTD) simulations were carried out to determine the feasibility, and the hardware of the transceiver was implemented within the ear shell. The size of the implemented transceiver was only $7{\times}7mm$, and it could successfully transmit signals to external devices. In order to measure the radiation pattern, a simple RF phantom was used, and the maximum attenuation from the phantom was observed to be 23 dB when the reference antenna was placed at a distance of 2 m from the transmitter.

Analysis of Shooting Consistency in Archers: A Dynamic Time Warping Algorithm-Based Approach

Quan, Cheng-Hao,Mohy-Ud-Din, Zia,Lee, Sangmin Hindawi Limited 2017 Journal of sensors Vol.2017 No.-

<P>The shooting consistency of an archer is commonly perceived to be an important determinant of successful scores. Four (n=4) elementary level archers from a middle school in Korea participated in this study. In order to quantify shooting consistency, movement of the bow forearm was measured with an inertia sensor during archery shooting. The shooting consistency was calculated and defined by the dynamic time warping (DTW) algorithm as the distance between two time sequences of acceleration data. Small distance values indicate that the archer has maintained high-level shooting consistency while archery shooting repetitively. To verify the shooting consistency metric, the relationship between scores and shooting consistency is evaluated. The results show that the higher the scores achieved by the archer, the higher is the level of shooting consistency demonstrated.</P>

Telemetry capsule for measuring contractile motion in the small intestine.

Woo, S H Arman,Mohy-Ud-Din, Z,Cho, J H Kluwer Academic Publishers 2013 Biomedical microdevices Vol.15 No.1

<P>The aim of this study was to develop a capsule which can measure contractions in the small intestine. Currently available methods cause discomfort to the patient while taking measurements; with the development of a telemetry capsule that can measure contractions, patients can avoid pain and continue with ordinary activities while the information is automatically collected from the external receiver. In order to develop the contraction force measuring capsule, various types of silicone transducers were designed and implemented to measure the contraction pressure in the small intestine. The minimum resolution of the implemented transducer was 0.05?mbar, which was small enough to measure contractions. The transducer was assembled with telemetry modules and packaged as a capsule (φ13??L25?mm) that had a similar size to a commercial capsule endoscope. In order to verify the function of the capsule, in vitro experiments were conducted and contractile motion was measured as 16.6?cycles per minute (CPM).</P>

Portable Battery Operated Light Emitting Diode (LED) Based X-ray Film Illuminator system

Sana Adeel,Muddasir Hussain,Zia Mohy-Ud-Din 한국재활복지공학회 2016 한국재활복지공학회 학술대회논문집 Vol.2016 No.11

The aim of the study is to design a portable, low powered X-ray film illuminator. It is a device that helps to illuminate the 2 d radiographic film that is to be viewed in medical emergency. The medical professionals widely use the illuminator to visualize the radiographic films to identify the anatomical structure, fracture and join dislocations of the bones. The conventional X-ray illuminators usually have tube lights to illuminate X-ray film on the screen. The illuminators comprise of tube lights base illumination system consume more power. Many countries that are not advanced may not be able to afford such energy and therefore such procedures are very expensive. The device proposed in this paper is a portable x-ray illuminator which is quite convenient to handle. It uses low powered light emitting diodes (LED) which consumes low energy. The proposed device is to design a battery operated and light weight system which can be portable. The set of red and blue LED are also used in the short portion of illuminator to study the radiographic film in detailed manner.