• 반도체디스플레이기술학회지
• /
• 제10권3호
• /
• pp.7-13
• /
• 2011

In Korea, the car mobile phone service had started in 1961 and with this Korea Mobile Telecommunications Services was established in 1984. Its service was mainly focused on the mobile phone service for the car which led the popularity of the full-scale mobile phone service. There are many kinds of materials, colors and patterns which are the elements of surface coating techniques. In light of that, we are focused on the UV coating that is ranked as an important part of the techniques in this study. In the first, the use of various materials for the cellular phone and surface processing techniques for the cellular phone were searched. On the basis of the results, the experiments of actual consumer experience with the exfoliation of the surface were done and through that we proposed the best way of processing the surface for the cellular phone and the materials. The result of the Wear Test showed that thick coating was detached more slowly and each company differed in their results with UV paints despite the same thickness of UV coating. The seal (UV) exfoliation of cellular phone is deeply related with the film thickness and the film formation when the users use the cellular phones and the exfoliation of the cellular phone surface will be decreased if the manufacturers meet the best conditions for the cellular phone.

• 디지털산업정보학회논문지
• /
• 제6권3호
• /
• pp.79-89
• /
• 2010

Cellular and Smart phone through the business and real life is associated with an increasing number of information processing, Breaches associated with mobile terminal Tile has occurred and cause Crime and damage. In this paper, Cellular and Smart phone for mobile forensics SYN scheme and JTAG scheme to target Cellular and Smart phone for the extraction of forensic data will be studied. SYN, JTAG approach to forensic analysis indicate with the process, Every Smart phone's OS specific performance and data extraction were compared. In the laboratory, Cell and smart phone with the SYN scheme and JTAG scheme to extract forensic data Improvement compared to the extraction is presented.

• 디지털산업정보학회논문지
• /
• 제4권4호
• /
• pp.63-69
• /
• 2008

Recently, every student would take lessons without knowing no lecture in campus life. And, If you are a university student, you tired a course to register in a crowded. For solving this problem, we choose the cellular phone. Nowadays peoples have one cellular phone to one person in korea. Using cellular phone, you can use cellular phone anywhere any time. In this paper, we studied mobile synthesis system using mobile cellular phone. According to use mobile campus system, the university and students can use easy an one to one service in ubiquitous.

• Journal of Information Technology Applications and Management
• /
• 제13권1호
• /
• pp.39-66
• /
• 2006

In a few years, a variety of mobile devices are expected to be utilized as a necessity for business as well as personal communications. Thus it is needed to conduct a comprehensive study on the acceptance of mobile devices in the mature market like Korea. This paper develops an extended technology acceptance model by including functional attributes of cellular phone and examines the determinant factors causing accepting cellular phones. Our empirical analysis through the internet survey shows that 1) among the determinant factors, perceived usefulness, perceived enjoyment or fun, and social pressure have positive direct impacts on the intention of accepting cellular phone, and 2) functional attributes of cellular phone affect the determinant factors differently.

• 한국정보통신학회논문지
• /
• 제9권5호
• /
• pp.912-919
• /
• 2005

무선 인터넷(Wireless Internet)의 발달로 인해 언제 어디서나 네트워킹이 가능한 환경이 구축되면서 휴대폰과 PDA 등의 모바일 단말기가 여러 분야에서 활용되고 있다. 특히 원격 제어에 있어서 모바일 단말기의 이동성은 큰 장점을 가진다. 본 논문은 모바일 단말기 중에서 가장 대중적인 휴대폰을 사용하여 원격 컴퓨터의 스크린 이미지를 전송받고, GUI 제어와 모니터링을 수행하는 Mobile VNC(Virtual Network Computing) 시스템을 설계 및 구현하였다. 제안하는 시스템은 휴대폰 상의 Mobile Viewer, 다수의 원격 컴퓨터 상의 VNC Server, VNC Monitor로 구성된다 VNC 서버와 모바일 뷰어 사이의 통신을 위해서 MRFB(Mobile RFB) 프로토콜을 사용하고, 모바일 뷰어로 전송되는 스크린 이미지는 휴대폰의 자바 실행 환경인 SK-VM이 지원하는 PNG 포맷으로 엔코딩한다. 구현 결과, 이미지 용량은 2KB-8KB로 측정되었고, 65회 전송 결과 평균 초당 전송률은 에뮬레이터에서 4.93fps, 실제 휴대폰은 0.8fps로 기존 시스템보다 빠른 성능을 보였다.

• 한국통신학회논문지
• /
• 제31권10B호
• /
• pp.929-935
• /
• 2006

When the Internet phone service, generally PC-to-Phone, first entered into the telecommunications service market, no regulatory issues were arisen to manage the service within the regulatory framework because of it's low quality, no phone number assignment and etc. However, almost the same quality, more applications and cheaper price compared with the fixed telecommunications service, have changed the regulator's policy allowing Internet phone service within market mechanism. While incumbent fixed telecommunications service enterprises had given with tremendous duties to continue the job categorized 'facilities-based telecommunication service provider', and which can be unreasonable and unfair if Internet phone service enterprises are allowed to enter into the fixed telecommunications market without any regulation. Thus, new regulatory framework has worked for the Internet phone service named the VoIP service generally in the fixed telecommunications market. Recently, VoIP is provided not only in the fixed telecommunications market but also in the mobile market as Wi-Fi phone is feasible in the wireless LAN environment. Furthermore, bundled service of Wi-Fi and cellular phone service will be launched soon, and the next version will be the mobile VoIP service operating like a cellular phone service. Hence, we will meet similar situation when the VoIP sewice enters into the fixed telecommunications service market. And, in this paper, we prospect the regulatory issues arising when the wireless or mobile VoIP service enterprises enter the mobile market, by analyzing possible scenarios.

• Journal of Information Processing Systems
• /
• 제8권3호
• /
• pp.521-538
• /
• 2012

As the knowledge society matures, not only distant, but also off-line universities are trying to provide learners with on-line educational contents. Particularly, high effectiveness of mobile devices for e-Learning has been demonstrated by the university sector, which uses distant learning that is based on blended learning. In this paper, we analyzed previous m-Learning scenarios and future technology prospects. Based on the proposed m-Learning scenario, we designed cellular phone-based educational contents and service structure, implemented m-Learning system, and analyzed m-Learning service satisfaction. The design principles of the m-Learning service are 1) to provide learners with m-Learning environment with both cellular phones and desktop computers; 2) to serve announcements, discussion boards, Q&A boards, course materials, and exercises on cellular phones and desktop computers; and 3) to serve learning activities like the reviewing of full lectures, discussions, and writing term papers using desktop computers and cellular phones. The m-Learning service was developed on a cellular phone that supports H.264 codex in 3G communication technology. Some of the functions of the m-Learning design principles are implemented in a 3G cellular phone. The contents of lectures are provided in the forms of video, text, audio, and video with text. One-way educational contents are complemented by exercises (quizzes).

• Annals of Clinical Neurophysiology
• /
• 제5권1호
• /
• pp.16-20
• /
• 2003

Background: Mobile phone has become a very popular device used in everyday our lives. However, the possible hazard to human body such as brain tumor has been proposed intermittently. This unwanted possibility was calmed down due to the absence of definite evidence of hazard. This study was performed to see the effect of mobile phone use on the brain temperature. Methods: In 20 volunteers, we performed 4 steps of temperature measuring procedure. Four steps are pre-use (S1, basal state), wire-phone (S2, conventional telephone), PCS phone (S3, using 1,750~1,900 MHz), cellular phone (S4, using 820 MHz) states. Brain temperatures were measured by radiothermometer at 10 sites (5 sites in each hemisphere) of the brain after 5minutes of telecommunication through the phones. The final data were compared using paired t-test. Results: In PCS phone user group (Average; $35.73708^{\circ}C$), brain temperature decreased (with statistical significance, p<0.05), compared to those of non-user group (Average; $35.9527^{\circ}C$) or conventional wire phone user group. In cellular phone user group (Average; $35.82155^{\circ}C$), brain temperature decreased slightly (without statistical significance, p>0.05) compared to those of non-user group (Average; $35.9527^{\circ}C$) or conventional wire phone user group (Average; $35.922^{\circ}C$). The temperature change was not limited to the mobile phone applied side but on both hemisphere of the brain. Conclusion: In conclusion, mobile phone (especially PCS phone) decreased brain temperature in both hemispheres without side-to-side temperature difference. In addition, this study suggests possibility of radiothermometer application to the study of electromagnetic wave effect and protection method research in the future.

• 정보처리학회논문지D
• /
• 제9D권5호
• /
• pp.819-826
• /
• 2002

휴대용 단말기를 이용한 모바일 벡터지도 서비스는 KVM(Kilobytes Virtual Machine)의 등장으로 인하여 PDA를 중심으로 보편화되고있는 추세에 있다. 그러나, 휴대폰 단말기에서 벡터 지도서비스는 대역폭과 단말기의 자원 제약 등으로 인하여 구현이 쉽지 않은 문제점이 있다. 그러므로, 별도의 휴대폰 전용 지도 데이터베이스를 개발하여 서비스할 수 밖에 없다. 그러나, 간소화된 휴대폰 전용 지도 데이터베이스의 개발은 많은 비용을 초래할 뿐더러, 동일한 지역에 대한 다양한 사용자 뷰를 제공하기 어려운 문제점을 안고 있다. 따라서, 본 논문에서는 기존의 지도 데이터베이스를 그대로 이용하여 휴대폰에서의 모바일 벡터 지도서비스를 지원하는 JAVA 기반 서버/클라이언트 시스템을 새로 설계하고 구현하여 제시한다. 본 제안 시스템은 클라이언트 모듈의 기능을 최소화하고 서버에서 지도 간소화 작업을 수행하여, 기존의 지도 데이터베이스로부터 직접 모바일 벡터지도 서비스가 가능하게 하였다.

• 한국통신학회논문지
• /
• 제33권6C호
• /
• pp.512-519
• /
• 2008

범죄에 사용된 휴대폰의 증거는 수사와 법정판단의 중요한 자료가 된다. 다양한 휴대폰의 종류와 모델, 통일되지 않은 파일 포맷을 사용하여 범죄 증거를 수집하고 분석하는 과정에 많은 어려움이 있다. 또한 압수 수사현장에서 휴대폰에 대한 압수수색 과정에서부터 포렌식 자료의 무결성 추출까지의 절차상 표준화가 되어 있지 않아, 법정에서 채택할 수 없게 된다. 본 논문에서는 휴대폰의 압수 수색 절차를 표준화한다. 표준 절차에 의한 범죄 현장에서 휴대폰 압수 수색 자료의 무결성을 확보 하기위한 전파차단봉투와 이동용 전파차단장치를 사용한다. 압수된 휴대폰의 증거 자료를 분석하고, 무결성 제손 실험을 통해 무결성을 검증하고, 휴대폰 압수수색 절차에 대한 문제점 및 대책을 제시함으로 모바일 포렌식의 발전에 기여하고자 한다.