• Journal of the Korean Academic Society of Industrial Cluster
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• v.4 no.1
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• pp.1-13
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• 2010

The T-DMB which was developed by the convergence of digital broadcasting technology and communication technology provides us with very good quality of music like CD, and provides TV services in a super express train like the KTX whose velocity is over 300 Km per hour. The T-DMB is diffusing toward the world as a technology which is be able to provide the various convergent services of broadcasting and communication through mobile phone, PDA, dedicated terminal, and so on. A business model needed for the diffusion of the T-DMB toward the world was established and utilized to expand the T-DMB into Vietnam in the paper. In addition, this paper describes a case for the establishment of the T-DMB system in order to provide the paid services in Vietnam. It is expected that the expansion of the T-DMB into Vietnam will make a great contribution to the diffusion of the T-DMB toward the world.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.5
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• pp.912-919
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• 2005

The Growth in wireless Internet has made Networking possible at anytime and anywhere. So mobile devices like cellular phone and PDA are now used in various fields. In particular, the mobility of mobile devices has a great advantage in remote control. This paper designed and implemented a Mobile VNC system that transmitted the screen image of a remote computer, control the remote computer GU and monitor all by cellular phone. The proposed system consists of a Mobile Viewer un on the cellular phone, VNC Server m on a number of remote computers and a VNC Monitor. For communication between the VNC Server and the Mobile Viewer the MRFB protocol is used. The screen image transmitted to the Mobile Viewer is encoded in the PNG format supported by SK-VM, the Java execution environment of the Cellular phone. According to implementation results, the image is about $2KB\~8KB$. According to the 65 times transmission test, the average frame per second is 4.93fps in the emulator and a real cellular phone takes 0.8fps. Therefore, the proposed system is more efficient than existing systems.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.426-429
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• 2006

A distributed healthcare monitoring system prototype for clinical and trauma patients, was developed, using wireless sensor network node. The proposed system aimed to measure various vital physiological health parameters like ECG and body temperature of patients and elderly persons and transfer his/ her health status wirelessly in Ad-hoc network, to remote base station which was connected to doctor's PDA/PC or to a hospital's main Server using wireless sensor node. The system also aims to save the cost of healthcare facility for patients and the operating power of the system because sensor network is deployed widely and the distance from sensor to base station was shorter than in general centralized system. The wireless data communication will follow IEEE 802.15.4 frequency communication with ad-hoc routing thus enabling every motes attached to patients, to form a wireless data network to send data to base-station, providing mobility and convenience to the users in home environment.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.36 no.2
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• pp.39-48
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• 2013

The development of mobile communication technology is transforming the market of mobile communication devices, which is used to be merely for simple communication, into the one which offers features of personal digital assistant (PDA), fax communication and Internet access. Unlike a mobile phone which comes out as a complete package and whose functions cannot be changed, a smart phone can be upgraded by its user, adding or removing apps as he pleases. OS's of smart phones are iOS-based Apple, Google Android, Window Mobile, and others. Due to its convenience and powerful features, many people use smart phones its high price. On the other hand, consumer complaints are rising on poor A/S for occasional malfunction. This study analyzes how A/S cases can be classified into groups according to quality factors. We evaluate factors such as consumer impression and consumer satisfaction. By dual quality evaluation using KANO method, we would like to show the different A/S strategy for smart phones, compared with mobile phones.

• Journal of the Korean Society for Precision Engineering
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• v.21 no.10
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• pp.86-93
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• 2004

This paper presents the remote measurement of the ECU signals adopted with KWP 2000 protocol using the wireless communication technique of bluetooth. The bluetooth technology will be the most promising network paradigm which can open the new area in the information technology. Especially, bluetooth module is able to link all the electrical products and personal computers to cellular phone or PDA. This research has a try to design a wireless measurement model of ECU signal based on the car telemery system using bluetooth device. In order to measure the ECU signals, we designed the interface circuits which is able to communicate between the ECU system and the terminal circuits according to the ISO, SAE regulation of communication protocol standard. A microprocessor S3c341 OX is used for the system control and communication of ECU signals. The embedded system software is programmed to measure the ECU signals using the ARM compiler and ANCI C based on Micro/OS-II kernel to communicate between two bluetooth modules using bluetooth stack. The remote measurement of ECU signals using the bluetooth was designed and implemented to evaluate the performance of wireless network to the transmit measurement data. The possibility for the remote measurement of the self diagnosis signals of ECU adopted with KWP2000 protocol verified through the developed systems and algorithms in embedded system.

• Journal of Biomedical Engineering Research
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• v.27 no.1
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• pp.14-21
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• 2006

As information technologies are developing, the improvement of the quality of life becomes worldwide issues. Especially, to improve the quality of life of a patient suffering intermittent diseases, in addition to the some portable equipments for measuring, analyzing, and notifying the status of the patients, methods of communication for seamless transmission of the measured data over to the remote site, such as an emergency center or a hospital, are required. In this paper, we address a seamless transmission of patient monitoring data such as ECG from a moving patient to a remote site, wherever the patient may be. We divide the whole environments into two wireless communication environments: an indoor one based on WLAN and an outdoor one based on CDMA cellular network in which the patient is assumed to move anywhere. We develop algorithms, implement them on a PDA-based hardware platform, and show some of the results for handover between the two environments in addition to the data transmission for each of the two environments.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.1
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• pp.25-30
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• 2009

The oriental medical treatment has many strong points when compared to the western medical treatment, but there are still problems when there is no scientific proof given concerning the effectiveness of a certain treatment. Moreover, experiments are being conducted where new medical treatments applied to patients suing both oriental and western techniques. Especially, in oriental acupuncture, there is no objective data on which an oriental medicine doctor can decide the injection time for acupuncture needle by considering a patients body condition, age and the condition of the diseases. From computer simulation results, it has been that the electronic needle is more efficient than the conventional method of acupuncture needle.

• 한국정보교육학회:학술대회논문집
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• 2005.08a
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• pp.322-330
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• 2005

현대 사회는 정보의 홍수 시대로서, 날로 늘어나는 정보의 바다 속에 검색의 한계도 존재하며 사람들이 원하는 정보를 선별하는 능력이나 방법도 고도화 되어져야 한다. 본 논문에서는 이러한 문제점을 해결하기 위해서 교육용 문서에 적합한 카테고리를 가지고 있는 RSS에 대한 소개와 함께 RSS 리더를 설계하고 구현하고자 한다. RSS 신디케이션 포맷은 누구든지 코멘트, 뉴스 헤드라인, 최신기사에 대한 링크, 설명 그리고 이미지 등을 쉽게 공유할 수 있도록 해준다. 이러한 정보는 웹사이트뿐만 아니라 PDA, 핸드폰, 이메일 등에서도 자유롭게 볼 수 있다. 이러한 RSS 기술은 e-learning에서도 추후 변화를 가져다 줄 것으로 예상된다. 교수설계자가 설계한 학습단위의 완성을 위해 자료를 수집하여 초고와, 원고를 만들기 위해 교정, 교열을 하며, 디자이너를 통해 HTML 페이지를 만들던 기존의 프로세스를 대폭 간소화시켜 줄 수 있기 때문이다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.752-755
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• 2004

선박용 엔진의 제작에 있어 크랭크 샤프트 조립 시 1 회전의 상태에서 크랭크 스루 간의 디플렉션의 상대값이 정상오차 범위를 넘어서는지 확인한 후 조립상태를 보정하게 된다. 기존의 방법은 다이얼 게이지를 사용하여 측정 담당자가 베드 플레이트 내에 들어가 크랭크 샤프트 회전 시 따라 돌면서 직접 육안 확인을 통해 측정이 이루어졌다. 이 때, 측정의 불편함과 열악한 작업환경 하의 안전 문제가 야기된다. 이러한 문제점을 해결하기 위해 본 연구에서는 블루투스 통신을 이용하여 디지털 게이지를 사용한 측정장치 기구부의 신호를 무선으로 받아서 작업자는 베드 플레이트 외부에서 측정이 가능하도록 하는 시스템의 개발하였다. 이를 통해 작업의 편리성 및 안정성을 확보했으며, 디지털 측정을 통한 측정의 정확도를 향상시켰다.

• Proceedings of the KAIS Fall Conference
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• 2007.05a
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• pp.168-171
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• 2007

향후, 유비쿼터스 환경에서의 무선 인터넷 서비스는 FDA 단말기를 이용하여 언제, 어디서나 업무처리가 가능하게 되고, 사용자들은 어느 장소에서나 최신의 정보 서비스를 제공받을 수 있는 편리한 시대를 실현시켜 줄 것이다. 본 논문에서는 현행 주정차 단속의 문제점을 보완하기 위해 PDA를 이용하여 원활한 주정차 단속업무를 실현하기 위한 소프트웨어를 다루고 있다. 이를 위하여, 먼저 주정차 단속을 위한 업무흐름을 분석하고, 이를 지원하고 위한 워크플로우 엔진의 설계 및 응용의 구현을 목표로 하여 추진되었다. 중요한 논문의 내용으로는 시스템 시나리오의 분석 및 소프트웨어의 구조 및 모듈설계, 그리고 구현환경 및 구현결과에 대한 내용을 다루고 있다.