• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1028-1033
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• 2005

Robot is composed of various devices but, those are incompatible with each other and hardly developing reusable control software. We suggest standard abstract interface for robot software component to make portable device and reusable control software of robot. This assures uniform abstracted interface to the device driver software like sensor and actuator and, control program can be transparent operation over device. We can develop devices and control software separately and independently with this idea. This makes it possible to replace existing devices with new devices which have a improved performance.

• The Journal of Information Technology
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• v.9 no.3
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• pp.49-57
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• 2006

Electronic paper technology is technology make e- paper, and studying an electronic device is thin like a paper book, an electronic device having made so as to be able to feel as it is feeling of paper like paper newspaper/paper magazines etc. and papers, and crumple freely, or to be able to fold. While electronic paper substitutes for role of paper, a digital function has at the same time a lot of the acids which shall exceed to implement. Necessary, and the continuous researcher who can solve a problem of a fast answer speed for animation implementation, collar implementation and low drive voltage is important a security of a patent right preparing for new market formation, too very in order to form the market where electronic paper can substitute for papers and the existing display as indication elements of a dream, and shall be made to achieve a continuous technical researcher.

• Journal of Korea Multimedia Society
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• v.20 no.2
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• pp.336-343
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• 2017

We propose a real time personalized recommendation algorithm on the mobile device. We use a unified collaborative filtering with reduced data. We use Fuzzy C-means clustering to obtain the reduced data and Konohen SOM is applied to get initial values of the cluster centers. The proposed algorithm overcomes data sparsity since it extends data to the similar users and similar items. Also, it enables real time service on the mobile device since it reduces computing time by data clustering. Applying the suggested algorithm to the MovieLens data, we show that the suggested algorithm has reasonable performance in comparison with collaborative filtering. We developed Android-based smart-phone application, which recommends restaurants with coupons and restaurant information.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2001.06a
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• pp.81-84
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• 2001

A signal path control switch has been designed and implemented with AT&T 0.5${\mu}{\textrm}{m}$ CMOS ORCA FPGA. This device controls the path of digital signals in SDH-based transmission system. The proposed switch is suitable for self-healing operation which protects against transmission network failure. The self-healing operation of the switch is effectively done by the reconfigurable information stored in the registers of the switch. This device consists of eight subparts such west-east transmitting parts, west-east receiving parts, add-drop control parts, AIS control Part, and CPU interface part. The device is capable to a ring network as well as a linear network.

• Electronics and Telecommunications Trends
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• v.32 no.6
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• pp.27-39
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• 2017

A variety of medical devices are utilized to repair or help injured body functions after accidental injury(such as a traffic accident), population aging, or disease. Such medical devices are being actively researched and developed in portable form, skin patchable type, and further, implantable form. In the future, active implantable medical devices for neuro and brain sciences are expected to be developed. Active implantable medical devices that detect brain signals and control neurology for a wider understanding of human cognition and nerve functions, and for an understanding and treatment of various diseases, are being actively pursued for future use. In this paper, the core elements of implantable devices that can be applied to neuro and brain sciences are classified into electrode technologies for bio-signal acquisition and stimulation, analog/digital circuit technologies for signal processing, human body communication technologies, wireless power transmission technologies for continuous device use, and device integration technologies to integrate them. In each chapter, the latest technology development trends for each detailed technology field are reviewed.

• Journal of the Korean Institute of Telematics and Electronics
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• v.10 no.5
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• pp.1-6
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• 1973

The paper deals with a study on an electronic watering device. The system is designed to scan 10 probes so that they detect moisture of soil. Input potentials are compared with reference level before the system is watering. rt provides a main clock oscillator and a control oscillator for the system control, and a programmable unijunction transistor is used for the control circuit. The reference levels are adjustable so as to water various soils. The device is tested for two different sails of moisture content ranging from 6 to 51%. It works at any input level higher than 0.6 V compared to the reference level.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06c
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• pp.210-211
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• 2012

본 논문에서는 N-Device 환경의 인증, 지불, 전자서명을 스마트폰에 탑재된 스마트지갑앱을 이용하여, 동일한 UX로 편리하게 이용할 수 있게 해주는 스마트채널 기술을 제안한다. 스마트채널 기술은 스마트 TV등 클라이언트 디바이스에서 스마트폰으로 인증, 지불 등의 트랜잭션을 이관하는 트랜잭션 트랜스밋 기술과 클라이언트 디바이스의 웹브라우저와 웹서버 간에 e2e 메시지 보안을 플러그인 없이 제공하는 메시지 보안 기술로 구성된다. 스마트채널 기술을 적용하면 서비스 제공자는 단일한 웹페이지를 이용해 모든 디바이스에 서비스할 수 있으며, 일체의 플러그인이 필요없게 된다. 이용자는 스마트지갑에만 크리덴셜을 저장 관리하고 이용하면 된다.

• Journal of information and communication convergence engineering
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• v.17 no.3
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• pp.221-226
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• 2019

In this work, a transmitter/receiver front-end module (T/R FEM) with an automatic Tx/Rx switching scheme for a 2.4 GHz microwave power transfer is developed for a retro-reflective beamforming scheme. Recently, research on wireless power transfer techniques has moved to wireless charging systems for mobile devices. Retro-reflective beamforming is a good candidate for tracking the spatial position of a mobile device to be charged. In Tx mode, the T/R FEM generates a minimum of 1 W. It also comprises an amplitude and phase monitoring port for transmitting RF power. In Rx mode, it passes an Rx pilot signal from a mobile device to a digital baseband subsystem to recognize the position of the mobile device. The insertion loss of the Rx signal path is 4.5 dB. The Tx and Rx modes are automatically switched by detecting the Tx input power. This T/R FEM is a design example of T/R FEMs for wireless charging systems based on a retro-reflective beamforming scheme.

• Journal of information and communication convergence engineering
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• v.17 no.3
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• pp.205-212
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• 2019

Motion tracking and localization devices are an important building block of motion tracking systems in a virtual reality (VR) environment. This study is about improving the accuracy of motion and location for enhancing user immersion in experience type VR environment to position tracking technique. In this study, we propose and test a design of such a device. The module data test of the attitude and heading reference system shows that the implementation with the MPU-9250 sensor is successful and adequate to be used with short operation time. We consider various sensor hardware dependencies of VR, and compare various correction methods and filtering methods to lower the motion to photon (MTP) time that user movement is fully reflected on the display using sensor devices. The Kalman filter is used to combine the accelerometer with the gyroscope in the sensing unit.

• Journal of Multimedia Information System
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• v.6 no.2
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• pp.99-106
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• 2019

In traditional Chinese medical (TCM) science, tongue images can be observed for medical diagnosis; however, the tongue diagnosis of TCM is influenced by the subjective factors of doctors, and the diagnosis results vary from person to person. Quantitative TCM tongue diagnosis can improve the accuracy of diagnosis and increase the application value. In this paper, digital image processing and pattern recognition technologies are employed on mobile device to classify tongue images collected in different health states. First, through grayscale integral projection processing, the trough is found to localize the tongue body. Then the tongue body image is transferred from RGB color space to HSV color space, and the average H and S values are considered as the color features. Finally, the diagnosis results are obtained according to the relationship between the color characteristics and physical symptoms.