• Proceedings of the Korea Society of Design Studies Conference
• /
• 2003.05a
• /
• pp.14-15
• /
• 2003

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2013.01a
• /
• pp.233-236
• /
• 2013

현대사회가 언제 어디서나 정보를 주고 받는 유비쿼터스 사회로 변화하면서 센싱기술, 통신기술, 서비스 기술 등을 이용하여 우리가 볼 수 있는 모든 사물을 사람과 통신 가능하게 해주는 IoT기술이 부각되고 있다. IoT는 일반적으로 사람의 관여 없이 사물 간에 이루어지는 통신을 뜻하는 것으로 국내에선 개념적으로 USN기술과 흡사하다. 본 논문에서는 USN 분야 중 하나인 모바일 RFID 기술을 이용한 도서 대출 시스템을 제안하고 무선으로 정보를 주고 받는 모바일 RFID의 특성을 고려하여 태그와 리더 간의 인증 프로토콜을 제시한다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2017.07a
• /
• pp.407-408
• /
• 2017

본 논문에서는 기존의 비데와 인체 정보 수집 센서류를 결합한 IoT기반의 스마트 비데를 위해 생체 측정 데이터를 효과적으로 관리하고 사용자들의 사용 편의성을 증가시키는 모바일 기반 어플을 설계한다. 제시하는 모바일 어플은 스마트 비데의 체온센서, 산소포화도센서, 압력센서를 통해 수집된 사용자의 생체정보를 블루투스 기반 통신을 통해 실시간으로 생체신호를 수집 및 디스플레이 하며, 특정 기간의 데이터 통계를 통해 생체 정보의 이력을 사용자에게 효과적으로 제공함으로써 각종 질병 예방에 기여할 수 있다.

• Journal of Korea Multimedia Society
• /
• v.19 no.1
• /
• pp.41-50
• /
• 2016

Moblie device based financial services are vulnerable to social engineering attacks because of the display screen of mobile devices. In other words, in the case of shoulder surfing, attackers can easily look over a user's shoulder and expose his/her password. To resolve this problem, a colour-based secure keyboard solution has been proposed. However, it is inconvenient for genuine users to verify their password using this method. Furthermore, password colours can be exposed because of fixed keyboard colours. Therefore, we propose a secure mobile authentication method to provide advanced functionality and strong privacy. Our authentication method is robust to social engineering attacks, especially keylogger and shoulder surfing attacks. According to the evaluation results, our method offers increased security and improved usability compared with existing methods.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.32 no.2
• /
• pp.85-93
• /
• 2009

GOMS model is a cognitive modeling method of human performance based on Goal, Operators, Methods, Selection rules. GOMS model was originally designed for desktop environment so that it is difficult for GOMS model to be implemented into the mobile environment. In addition, GOMS model would be inaccurate because the original GOMS model was based on serial processing, excluding one of most important human information processing characteristics, parallel processing. Therefore this study was designed to propose a modified GOMS model including mobile computing and parallel processing. In order to encompass mobile environment, an operator of 'look for' was divided into 'visual move to' and 'recognize' whereas 'point to' and 'click' were combined into 'tab.' The results showed that newly introduced operators were necessary to estimate more accurate mobile computing behaviors. In conclusion, modified-GOMS model could predict human performance more accurately than the original GOMS model in the mobile computing environment.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2012.07a
• /
• pp.247-249
• /
• 2012

본 논문에서는 최근 IT 기술의 집약체인 스마트폰을 중심으로 국제표준인 ISO/IEEE11073, HL7을 준용하여 다양한 PHD(Personal Health Device)들과의 연결성을 지원하는 모바일 게이트웨이 플랫폼을 구축을 통하여 홈&모바일 헬스케어 분야에서 새로운 모델을 제시하고자한다. 아울러 핵심 기술 요소인 ISO/IEEE11073, HL7 적용을 통해 홈 헬스케어용 센서 기기에 대한 각종 기술을 축적 하고 최근에 활용이 보편화되고 있는 스마트폰을 활용한 헬스케어 플랫폼 적용으로 우수성을 확보하고자 한다.

• The Journal of Information Systems
• /
• v.33 no.2
• /
• pp.27-45
• /
• 2024

Purpose The purpose of this study is to understand the important characteristics of mobile content services and to provide better content services to Chinese consumers by understanding consumer behavioral psychology about mobile content services and empirically analyzing research models with perceived usefulness, perceived enjoyment, customer attitudes, and repurchase intentions based on motivation theory. Design/methodology/approach Based on Deci(1975) Self-Determination Theory and Heijden(2004) research model, this study developed a research framework that includes perceived usefulness and perceived enjoyment to influence on repurchase intention. A questionnaire survey was conducted targeting Chinese consumers using mobile content services, and 272 valid responses were analyzed using Structural Equation Modeling (SEM). Findings According to the results of empirical analysis in this study, Chinese consumers were found to feel repurchase intention by positive impact of perceived usefulness and perceived enjoyment in the use of mobile content service. Chinese consumers still use mobile content a lot from a utilitarian perspective in relation to social life or job performance, and there is no positive effect on the use of mobile content related to perceived enjoyment. The results of this study provide the empirical results of a research model that integrates motivation theory and technology acceptance theory for the development of the mobile content industry in the future, and provide necessary insights for managers of companies that develop and distribute mobile content service.

• Proceedings of the IEEK Conference
• /
• 2008.06a
• /
• pp.565-566
• /
• 2008

The high efficiency power management IC(PMIC) for Moblie application is proposed in this paper. PMIC is controlled with PWM control method in order to have high power efficiency at high current level. The saw-tooth generator is made to have 1.2 MHz oscillation frequency and full range of output swing from ground to supply voltage(VDD:3.3V). The comparator is designed with two stage OP amplifier. And the error amplifier has 70dB DC gain and $64^{\circ}$ phase margin. DC-DC converter, based on Voltage-mode PWM control circuits, achieved the high efficiency near 95% at 100mA output current. DC-DC converter is designed with LDO in stand-by mode which fewer than 1mA for high efficiency.

• Journal of the Institute of Convergence Signal Processing
• /
• v.23 no.2
• /
• pp.50-61
• /
• 2022

This work demonstrates the design and evaluation of Aqua-Aware, a lightweight miniaturized light emitting diode (LED) based underwater compact sensor node which is used to obtain different characteristics of the underwater environment. Two optical sensor nodes have been designed, developed, and evaluated for a short and medium link range called as Aqua-Aware short range (AASR) and Aqua-Aware medium range (AAMR), respectively. The hardware and software implementation of proposed sensor node, algorithms, and trade-offs have been discussed in this paper. The underwater environment is emulated by introducing different turbulence effects such as air bubbles, waves and turbidity in a 4-m water tank. In clear water, the Aqua-Aware achieved a data rate of 0.2 Mbps at communication link up to 2-m. The Aqua-Aware was able to achieve 0.2 Mbps in a turbid water of 64 NTU in the presence of moderate water waves and air bubbles within the communication link range of 1.7-m. We have evaluated the luminous intensity, packet success rate and bit error rate performance of the proposed system obtained by varying the various medium characteristics.

• Journal of Digital Convergence
• /
• v.19 no.6
• /
• pp.355-362
• /
• 2021

This study was attempted to examine the effectiveness of mobile-based military WithYou programs. The research design was a quasi-experimental study with one group pretest-posttest design. Data were collected from 17 December to 23 December 2020. 42 and 37 members of the Air base in City C participated in the pretest and posttest, respectively. A video education program developed to inspire bystander intervention efficacy and the intention of helping peers and strangers was provided on mobile. The data collected before and after attending the program were analyzed using descriptive statistics and t-test. The results showed that mobile-based military WithYou program was effective in increasing the intention to help friends and others. Attempts to develop and apply educational content using mobile devices for military personnel will be meaningful.