• 대한전자공학회논문지TC
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• 제45권10호
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• pp.90-98
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• 2008

휴대폰에서의 제한된 메모리 용량 및 CPU 성능으로 인하여, 유선망에서의 전자상거래 보안에 사용되는 PKI를 그대로 휴대폰 보안에 사용하기는 적당치 않다. 그러므로 유선망과 비슷한 보안 기능을 제공하면서도 휴대폰에 적용할 수 있는 무선 PKI 기능을 개발할 필요가 있다. 이에 본 논문에서는 경량화되고 안전한 무선 인증서 관리 프로토콜을 제안한다. 제안한 프로토콜은 휴대폰의 제한된 통신 환경 및 성능을 고려하였다. 또한 우리는 제안된 프로토콜에 대하여 시험적으로 구현하였다. 시험 구현에서 무선 인증서 관리 프로토콜의 모듈 사이즈는 휴대폰에 탑재 할 수 있을 정도로 작게 구현되었으나, 보안 기능은 유선망의 인증서 관리 프로토콜의 경우에 비하여 비슷함을 알 수 있었다.

• 한국콘텐츠학회논문지
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• 제13권6호
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• pp.412-424
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• 2013

최근 정보기술의 발달과 함께 휴대폰 보급이 확대되면서 휴대폰 중독의 역기능이 심각한 사회적 문제로 대두되고 있다. 휴대폰 중독은 아직 정신적으로 발달단계에 있는 청소년에게 심각한 악영향을 미치기 쉽다. 본 연구의 목적은 청소년의 휴대폰 중독 예방을 위한 방안을 마련하는 데 있다. 이를 위해 본 연구는 성별과 시간관의 차이, 시간관과 자기효능감 간의 관계를 분석하였다. 1차로 1,224명의 중 고등학생을 대상으로 성별 학교급별 시간관과 휴대폰 중독의 차이 분석을 실시하고 기존 연구와의 차이점을 기술하였다. 2차로 269명의 고등학생들을 대상으로 시간관과 자기효능감이 휴대폰 중독에 미치는 영향에 있어서 자기효능감이 매개변수 역할을 함을 구조방정식 모형으로 검증하였다. 마지막으로 분석결과를 바탕으로 향후 중 고등학교 학생들의 휴대폰 중독 예방을 위한 교육적 제언을 하였다.

• 대한불안의학회지
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• 제8권2호
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• pp.127-132
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• 2012

Objective : This study aims to investigate the relationship between addictive mobile phone use and post-traumatic stress disorder (PTSD) symptoms in bullies who experienced school violence. Methods : The study subjects consisted of 97 adolescents in The Foundation for Preventing Youth Violence after school violence. The participants conducted self-report questionnaire for addictive mobile phone use and Impacted Event Scale-revised-Korean version (IES-R-K). Partial correlation and multiple logistic regressions were performed. Results : The scores related to addictive mobile phone use were correlated with total score (r=0.21, p=0.04), avoidance score (r=0.21, p=0.04) and intrusive score (r=0.26, p=0.01) related to PTSD symptoms on the IES-R-K. Intrusive score related to PTSD symptoms on the IES-R-K were significant risk factor for addictive mobile phone use (O.R=1.25, 95% CI=1.12-1.39). Conclusion : This data supports that PTSD intrusive symptoms could be predictable factor of addictive mobile phone use. An appropriate intervention about PTSD symptoms might play a useful role in preventing addictive mobile phone use in bullies of school violence.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.1101-1104
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• 2005

As intelligence of robot is developed, consumer of robot changes by ordinary people. Intelligent service robot is produced to a target of ordinary people. It is risen that need the most service robot business. Among the control mobile robot because using network by real time. Do to appear on mobile phone LCD screen being transmitted image from device that acquire transmit of mobile phone user interface development and real time mobile robot in this study. Use the BREW that is Qualcomm's Mobile platform for mobile phone user interface development. Mobile phone JPEG compression function chooses excellent camera phone and display transmit image which send connection setting screen and mobile robot on LCD screen by real time. At the same time, materialize to make screen that can process button input that can control transfer of robot. Also, Relay Server used to help processing of protocol to control direction of mobile robot.

• 디지털융복합연구
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• 제4권2호
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• pp.127-142
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• 2006

This paper uses a Mobilans case based on software system to derive the results of our study. Recently, the mobile phone payment entered its matured stage and became most frequently used payment method in all internet sites. And, in order to prepare for the future ubiquitous market, every mobile phone payment methods has different speed of development, market status and target segments in the market. This paper also discusses about the background and current status of Korean mobile phone payment market using SMS(Short Message Service) to purchase items on internet which is growing sharply every year. Also, we try find the key factors to succeed in this growing market. In addition to safety, delayed payment and the immediateness for use of mobile phone, we also suggest that a highly developed hardware system is an additional factor under the increased demands for the convenience with various applications.

• 디지털산업정보학회논문지
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• 제4권4호
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• pp.63-69
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• 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.

• 소성∙가공
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• 제20권1호
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• pp.54-59
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• 2011

Optical properties in injection molded plastic lenses for mobile phone camera have been simulated using commercial program, 3D TIMON. Four plastic lenses are being used in mobile phone camera. The quality of photographs taken by mobile phone camera is strongly depends upon optical characteristics of lenses. The variety of optical properties has been investigated according to the injection conditions through the computer simulation. Consequently optimal injection conditions for four lenses have been determined and simulation results of birefringence have been compared with experiments.

• 한국음향학회지
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• 제19권6호
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• pp.23-27
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• 2000

소음이란 듣고 싶지 않거나 시끄러운 소리로 정의될 수 있다. 이동전화 벨소리가 특정한 상황에서 너무 크다면 소음으로 간주된다. 이동전화 벨소리의 특정한 수준을 소음으로 분류하기 위해서는 특정한 상황에서의 벨소리 수준에 대한 평균호감도를 평가하는 것이 유용하다. 본 논문에서는 이동전화 벨소리의 여러 수준(dBA)에 대한 평균호감도를 벨소리의 종류(벨/멜로디), 성별(남/녀), 장소(거리/사무실)에 대하여 평가한다.

• 소성∙가공
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• 제15권1호
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• pp.76-81
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• 2006

In this study, warpage characteristics of mobile phone cover through injection molding process were investigated using design of experiments in injection molding process. Warpage in plastic injection molding has a significant effect on quality of product. Effects of injection time, packing pressure, packing time, mold temperature and melt temperature on the warpage of mobile phone cover were considered by numerical analysis and experiment with Taguchi method. The degree of warpage for the injection molded part was measured by using three dimensional coordinate measurement machine. It was shown that temperature control factor has more significant effect on the warpage of mobile phone cover than pressure control factor.

• International Journal of Human Ecology
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• 제5권2호
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• pp.93-110
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• 2004

The purpose of this study is to investigate the money management behavior according to the consumption value for consumers, especially for adolescents. Using 502 samples of middle school adolescents, a survey was conducted from May 10 to May 20, 2004. The main results were as follows: 1) The consumption value for adolescent consumers was categorized conspicuous-consumption value, brand-oriented value, mental-oriented value and advertising-dependent value. 2) Female adolescent, with more private spending money, with mobile phone, with importance on brand when purchasing mobile phone, paying more for using mobile phone, having conspicuous-consumption value, with more importance for brand when purchasing mobile phone and having more advertising-oriented value. Adolescent consumers with less private spending money, less payment for mobile phone and having mental-oriented value. 3) Female, with more educated mother, with less spending private money and having better money management behavior. 4) With less conspicuous-consumption value, more mental-oriented value, adolescent consumers have better for money management behavior.