• Journal of rehabilitation welfare engineering & assistive technology
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• v.7 no.1
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• pp.51-58
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• 2013

As it is changing into aging society, rehabilitation, welfare and sports industry markets are being expanded fast. Especially, the field of vital signals interface to control welfare instruments like wheelchair, rehabilitation ones like an artificial arm and leg and general electronic ones is a new technology field in the future. Also, this technology can help not only the handicapped, the old and the weak and the rehabilitation patients but also the general public in various application field. The commercial bio-signal measurement instruments and interface systems are complicated, expensive and large-scaled. So, there are a lot of limitations for using in real life with ease. this thesis proposes a wireless transmission interface system that uses EMG(electromyogram) signals and a control module to manipulate hardware systems with portable size. We have designed a hardware module that receives the EMG signals occurring at the time of wrist movement and eliminated noises with filter and amplified the signals effectively. DSP(Digital Signal Processor) chip of TMS320F2808 which was supplied from TI company was used for converting into digital signals from measured EMG signals and digital filtering. We also have used PCA(Principal Component Analysis) technique and classified into four motions which have right, left, up and down direction. This data was transmitted by wireless module in order to display at PC monitor. As a result, the developed system obtains recognition success ratio above 85% for four different motions. If the recognition ratio will be increased with more experiments. this implemented system using EMG wrist direction signals could be used to control various hardware systems.

• Electronics and Telecommunications Trends
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• v.24 no.3
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• pp.91-102
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• 2009

FCC(Federal Communications Commission 미국 연방통신위원회)는 2008년 11월 스펙트럼 사용 효율을 높이고 새로운 서비스 도입을 용이하게 하기 위해 TV White Spaces를 대상으로 주파수 공유 기술인 Cognitive Radio 기술을 적용하기로 하고 관련 규정을 개정하였다. FCC는 TV White Spaces에서 고정 서비스와 개인/휴대서비스기기 사용을 허용하기로 방침을 정하고 2009년 5월 12일 DTV 전환 완료 이후 관련 기기 사용을 허용하기로 하였다. 본 논문에서는 FCC의 법규 개정 현황과 함께 이를 기술적으로 뒷받침하기 위한 IEEE 802.22, TV White Spaces ECSG, ECMA에서의 표준화 동향을 설명하고, 핵심 기술로서 스펙트럼 센싱 기술, 무선자원관리 기술, PHY/MAC 관련 기술 개발 동향에 대해 요약 기술하였다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.9
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• pp.39-48
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• 2009

Human face tracking has gradually become an important issue in applications for portable multimedia devices such as digital camcorder, digital still camera and cell phone. Current embedded face tracking software implementations lack the processing abilities to track faces in real time mobile video processing. In this paper, we propose a power efficient hardware-based face tracking architecture operating in real time. The proposed system was verified by FPGA prototyping and ASIC implementation using Samsung 65nm CMOS process. The implementation result shows that tracking speed is less than 8.4 msec with 150K gates and 20 mW average power consumption. Consequently it is validated that the proposed system is adequate for portable multimedia device.

• Journal of The Korean Association of Information Education
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• v.9 no.3
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• pp.511-522
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• 2005

The rapid development of information & communication technology has changed the paradigm of education. Recently the area of education is introducing u-Learning, in which learning is possible at any time and in any place through personal information devices such as PDA, tablet PC and mobile phone terminals. Taking advantage of the mobility and individuality of personal information devices, u-Learning can provide learning customized to the characteristics of individual learners without the limitations of time and space and can be effective in situational learning and experiential learning. In order to identify the uses of PDA in teaching.learning and to develop a basic teachinglearning model using PDA, the present study applied PDA directly to classes and examined the effects. According to the result, most students were satisfied with classes utilizing PDA but problems were also found in connection, insufficient contents for PDA, the quality of screen, etc.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.4
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• pp.617-627
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• 2013

Wireless communication technology such as NFC and RFID makes the data transfer between devices much easier. Instead of the irksome typing of passwords, users are able to simply authenticate themselves with their smart cards or smartphones. Relay attack, however, threatens the security of token-based, something-you-have authentication recently. It efficiently attacks the authentication system even if the system has secure channels, and moreover it is easy to deploy. Distance bounding or localization of two devices has been proposed to detect relay attacks. We describe the disadvantages and weakness of existing methods and propose a new way to detect relay attacks by recording a background noise.

• Journal of The Korean Association of Information Education
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• v.11 no.2
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• pp.185-194
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• 2007

With the advent of ubiquitous society, the paradigm of education is also changing. In u-learning in ubiquitous environment, mobile devices such as cellular phone, PDA, PMP, UMPC and TPC will become important learning tools. Particularly if RFID, a key technology in ubiquitous society, is utilized in teaching-learning along with mobile devices, we can expect much more meaningful learning. The present study proposed four types of application of RFID to teaching.learning, which were RFID-card, RFID-book, RFID-label and RFID-test, and examined their possibility and effectiveness. According to the results of this study, technology was insufficient to support the application of RFID-label to teaching-learning and continuous research was required for modeling the application of RFID to teaching-learning.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.771-772
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• 2011

본 연구에서는 최근 네트워크 기술의 발전으로 가정 내 정보가전기기의 네트워크가 중요해지는 점에 따라 기존의 네트워크 기반의 홈 오토메이션 시스템의 단점을 극복할 HCAS(implementation of house customize automation system based on smart-phone)를 구현하고자 하였다. 기존의 단점으로는 필요한 기능을 사용자에 따라 쉽게 변경하지 못하는 점과 홈 오토메이션 시스템의 높은 비용 등이 있다. 이러한 단점을 보완하기위해 Customize 즉, 사용자의 선택에 따라 제어 가능한 가전기기의 추가 및 제거가 가능한 기능을 구현하였고 ZigBee기술을 사용함으로써 저 전력 무선네트워크를 구현하였다. 그리고 최근의 이슈인 스마트폰을 이용함으로써 기존의 월패드형 이나 리모컨형의 불편한 휴대성을 보완하였고 직관적이며 이미지기반의 사용자 인터페이스는 HCAS의 사용자들이 시스템 제어를 조금 더 편리하고 쉽게 할 수 있게 하였다. 또한 실제로 제작한 모델 하우스에 적용시켜보고 추후의 연구 방향을 제시 하였다.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.6 no.1
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• pp.29-35
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• 2012

Most Augmentative and Alternative Communication(AAC) use exclusive equipment or studied desktop, tablet PC based windows. Besides, the preceding study offers proper noun dictionary so, henceforward study has problem to innumerable proper noun processing. This paper suggests a method of proper noun processing using a mobile smart equipment. And via the button with virtual keyboard input method and the errors that can occur is also proposing a complementary way. AAC system to check availability for application on Android has been implemented. Experimental results, depending on user location and selection of proper nouns in the around could produce a sentence is derived.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.769-772
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• 2006

지식정보화의 사회적 발전에 따라 IT기술도 장소와 공간에 제약 받지 않는 이동성, 휴대성이 강조되고 있다. 이는 유비쿼터스 사회로의 급격한 진입이라는 시대적 상황과 맞물려 유비쿼터스 컴퓨팅 환경에 적합한 컴퓨팅 디바이스의 등장이 요구되고 있다. 본 논문에서는 다양한 포터블기기(PMP, UMPC, MP3, 게임기)들의 기능과 콘텐츠를 조사, 분석하여 차세대 포터블 멀티미디어 시스템에서 요구되는 기능을 도출하였으며 또한 이를 기반으로 모듈화 된 포터블 멀티미디어 시스템의 구조를 설계했다. 본 연구의 결과는 점차 성숙해가고 있는 포터블 멀티미디어 시스템 산업의 하드웨어적 표준을 제시함으로써 효율적인 개발 방안을 모색할 수 있을 것으로 기대된다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.3
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• pp.225-232
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• 2009

Increasing the number of the solitude old person maintain a healthy lifestyle, the research for the emergency detection and life monitoring is required. In this paper, the wireless sensor network technology is utilized to design a silver-care service model in the area of emergency silver generation activities. The service model proposed in this paper acquired by using mobile devices to access silver-care service with the network information obtained through video monitoring and sensing. Also, Proposed model, based on wide-area network connected with the best wireless network of the PDA and mobile phones for the solitude old person.