Mun-Ho Ryu

Design of Two-Dimensional Coils for Wireless Power Transmission to In Vivo Robotic Capsule

This paper presents a design of two dimensional receiving coils to provide hundreds of milli-watt power via inductive link to in vivo robotic capsules, whose orientation are practically undetermined. The wireless power transmission system consists of a transmitter powered by class E power amplifier, and receiver with 2-dimensional antenna, rectifier, and voltage regulator. Two types of 2-dimensional antennas are designed and evaluated by theoretic and experimental analysis. Experimental results show that the proposed 2-D receiving antenna could deliver the power homogeneously against its orientation, with less than 20% of variation of the possible maximum power

Recognition of sign language with an inertial sensor-based data glove

Communication between people with normal hearing and hearing impairment is difficult. Recently, a variety of studies on sign language recognition have presented benefits from the development of information technology. This study presents a sign language recognition system using a data glove composed of 3-axis accelerometers, magnetometers, and gyroscopes. Each data obtained by the data glove is transmitted to a host application (implemented in a Window program on a PC). Next, the data is converted into angle data, and the angle information is displayed on the host application and verified by outputting three-dimensional models to the display. An experiment was performed with five subjects, three females and two males, and a performance set comprising numbers from one to nine was repeated five times. The system achieves a 99.26% movement detection rate, and approximately 98% recognition rate for each fingers state. The proposed system is expected to be a more portable and useful system when this algorithm is applied to smartphone applications for use in some situations such as in emergencies.

Robust template-matching measurements for variations of signal amplitude

A nonlinear measure for template matching is introduced to accommodate the signal amplitude variation of the targeting objects in noisy images. The pixels in the image area corresponding to the template are partitioned into two groups: the brighter pixels and the darker ones. The proposed measure is defined as the difference of the numbers of the brighter pixels in the object and the background. It is compared with the classical normalized covariance for the stability of the response and the success rate under the white Gaussian noise and the impulsive one, verifying its superiority. The proposed measure is tested also for a set of real images, where the target objects have disparate backgrounds. It is proved to have better performance than the normalized covariance, by comparing the correct match responses with the maximum of the mismatch responses, as well as the receiver operating characteristics.

Relative Location Estimation of Power-Receiver from Transmitter for In Vivo Robotic Capsules

This paper presents an estimation method of the relative location of the power-receiver from the transmitter for in vivo robotic capsules. The proposed method utilizes the fact that the needed current for driving the power transmitter is increased when the receiver coil is inductively coupled with the transmitter coil. By investigating the current increase characteristic according to the relative locations of the receiver, we draw an estimation strategy on the relative location of power-receiver from the transmission coil

Nonlinear matching measure for the analysis of on-off type DNA microarray images

We propose a new nonlinear matching measure for automatic analysis of the on-off type DNA microarray images in which the hybridized spots are detected by a template-matching method. The proposed measure is obtained by binary thresholding over the entire template region and taking the number of white pixels inside the spotted area. This measure is compared with the normalized covariance method in terms of classifying the ability to successfully locate markers. The proposed measure was evaluated for scanned images of human papillomavirus (HPV) DNA microarrays where locating markers is a critical issue because of the small number of spots. The targeting spots of HPV DNA chips are designed for genotyping twenty-two types of the human papillomavirus. The proposed measure is proven to give a more discriminative response, reducing the missed cases of successful marker location. The locating accuracy of the proposed method is also shown to have the same performance as that of the normalized covariance.

Human Joint Angle Estimation with Multiple-strip E-textile Stretching Sensor

1Department of Healthcare Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabuk 561-756, Republic of Korea 2Division of Biomedical Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabuk 561-756, Republic of Korea 3Research Center of Healthcare & Welfare Instrument for the Aged, 567 Baekje-daero, Deokjin, Jeonju, Jeollabuk 561-756, Republic of Korea 4CAMTIC Advanced Mechatronics Technology Institute for Commercialization, 67 Yu-Sang-ro, Deokjin, Jeonju, Jeollabuk 561-844, Republic of Korea

Smartphone-Driven Low-Power Light-Emitting Device

Low-level light (laser) therapy (LLLT) has been widely researched in the recent past. Existing LLLT studies were performed based on laser. Recently, studies using LED have increased. This study presents a smartphone-driven low-power light-emitting device for use in colour therapy as an alternative medicine. The device consists of a control unit and a colour probe. The device is powered by and communicates with a smartphone using USB On-The-Go (OTG) technology. The control unit controls emitting time and intensity of illumination with the configuration value of a smartphone application. Intensity is controlled by pulse width modulation (PWM) without feedback. A calibration is performed to resolve a drawback of no feedback. To calibrate, intensity is measured in every 10 percent PWM output. PWM value is linearly calibrated to obtain accurate intensity. The device can control the intensity of illumination, and so, it can find application in varied scenarios.

Arduino-based automation of a DNA extraction system

There have been many studies to detect infectious diseases with the molecular genetic method. This study presents an automation process for a DNA extraction system based on microfluidics and magnetic bead, which is part of a portable molecular genetic test system. This DNA extraction system consists of a cartridge with chambers, syringes, four linear stepper actuators, and a rotary stepper actuator. The actuators provide a sequence of steps in the DNA extraction process, such as transporting, mixing, and washing for the gene specimen, magnetic bead, and reagent solutions. The proposed automation system consists of a PC-based host application and an Arduino-based controller. The host application compiles a G code sequence file and interfaces with the controller to execute the compiled sequence. The controller executes stepper motor axis motion, time delay, and input-output manipulation. It drives the stepper motor with an open library, which provides a smooth linear acceleration profile. The controller also provides a homing sequence to establish the motors reference position, and hard limit checking to prevent any over-travelling. The proposed system was implemented and its functionality was investigated, especially regarding positioning accuracy and velocity profile.

Automatic Reading System for On-off Type DNA Chip

In this study we propose an automatic reading system for diagnostic DNA chips. We define a general specification for an automatic reading system and propose a possible implementation method. The proposed system performs the whole reading process automatically without any user intervention, covering image acquisition, image analysis, and report generation. We applied the system for the automatic report generation of a commercialized DNA chip for cervical cancer detection. The fluorescence image of the hybridization result was acquired with a GenePix TM scanner using its library running in HTML pages. The processing of the acquired image and the report generation were executed by a component object module programmed with Microsoft Visual C++ 6.0. To generate the report document, we made an HWP 2002 document template with marker strings that were supposed to be searched and replaced with the corresponding information such as patient information and diagnosis results. The proposed system generates the report document by reading the template and changing the marker strings with the resultant contents. The system is expected to facilitate the usage of a diagnostic DNA chip for mass screening by the automation of a conventional manual reading process, shortening its processing time, and quantifying the reading criteria.