• 한국공간구조학회논문집
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• 제15권3호
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• pp.77-83
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• 2015

The cases of conducting the vibration measurement using the mobile phone with regard to the building's horizontal vibration are very rare in Korea and foreign countries. Therefore, this study analyzed the horizontal vibration nature of the building using the mobile phone targeting 5 tall buildings, and reviewed about the applicability of the mobile phone vibration measuring instrument through the comparison/verification with the data of the existing vibration measuring instrument. The peak of the measured time series waveform was measured clearly and it showed a similar value to the existing natural frequency.

• 아동학회지
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• 제36권1호
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• pp.147-162
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• 2015

This study examined the role of after-school caregiver absence in the relationship between school adjustment and mobile phone dependency during early adolescence. Sixth grade students(N=1,863) from the nationally representative Korea Child and Youth Panel Study were analyzed using moderated multiple regression models. The results showed that higher school adjustment may be effective in reducing youth mobile phone dependency. There was also a significant interaction effect between school adjustment and high caregiver absence, indicating that the protective role of school adjustment concerning mobile phone dependency may be less effective among youth of highest risk. Policy implications of the results are also discussed.

• 산업기술연구
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• 제30권B호
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• pp.41-47
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• 2010

Recently, the introduction of iPhone forced Korea to open its mobile market worldwide. The success of iPhone s open and cooperative code and the transition to the software-oriented paradigm also forces Korean mobile industry to greatly change according to the new trend for mobile market. Therefore, in this paper, to cope with such challenges, we investigate the effect of iPhone and then estimate its future prospect. Specifically, we focus on the effect on domestic mobile market, domestic software industry and individual's mobile life.

• 디지털산업정보학회논문지
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• 제6권4호
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• pp.237-250
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• 2010

The present paper focuses on the comparison of user experience of mobile phone keypad and touchpad. Mobile phone has recently adopted a touchpad keyboard style and it gives users advantages and disadvantages as well. This paper examined usability, usefulness, affect and attitude of those two keyboard styles and disclosed interesting outcomes. First, keypad is better than touchpad in usefulness and usability. Second, touchpad is better than keypad in affect. Finally, touchpad is better than keypad in attitude. Overall, although touchapd is evaluated as worse keyboard in usability and usefulness, test subjects favored touchpad keyboard because it is more emotional and affective. It implies new digital device including mobile phone has to get more affective appeal to the young users and emotion will be a key point in digital consumption.

• 한국생활과학회지
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• 제23권2호
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• pp.163-174
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• 2014

This study aimed to discriminate the groups clustered by mobile phone dependency and use type and to explore the quality of parent child-rearing attitudes and peer relationships predicting the types of groups. The subjects were the 688 fourth-grade students participating in the Korea Child Youth Panel Surveys. The data were analyzed with descriptive statistics, cluster analysis, One-way ANOVA and multinominal logistic regressions. The main results of this study were as follows. Firstly, as the result of cluster analysis inputting the mobile phone dependency and use type, the four clustered groups were produced. Secondly, the quality of parent child-rearing attitudes and peer relationships discriminating the four groups were parents' supervision, over-involvement, love, senses of non-alienation from peers and communicating with them. Therefore, this study suggested the parent education and peer-relationship improving program to form children's good habits of mobile phone use.

• ETRI Journal
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• 제41권3호
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• pp.337-347
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• 2019

The specific anthropomorphic mannequin (SAM) phantom was designed to provide a conservative estimation of the actual peak spatial specific absorption rate (SAR) of the electromagnetic field radiated from mobile phones. However, most researches on the SAM phantom have been based on early phone models. Therefore, we numerically analyze the SAM phantom to determine whether it is sufficiently conservative for various types of mobile phone models. The peak spatial 1- and 10-g averaged SAR values of the SAM phantom are numerically compared with those of four anatomical head models at different ages for 12 different mobile phone models (a total of 240 different configurations of mobile phones, head models, frequencies, positions, and sides of the head). The results demonstrate that the SAM phantom provides a conservative estimation of the SAR for only mobile phones with an antenna on top of the phone body and does not ensure such estimation for other types of phones, including those equipped with integrated antennas in the microphone position, which currently occupy the largest market share.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2006년도 학술대회 1부
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• pp.909-917
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• 2006

In the last decade, the research of the usability of mobile phones has been a newly evolving area with few established methodologies and realistic practices that ensure capturing usability in evaluation. Thus, there exists growing demand to explore appropriate evaluation methodologies that evaluate the usability of mobile phones quickly as well as comprehensively. This study aims to develop a task-based usability checklist based on heuristic evaluations in views of mobile phone UI practitioners. A hierarchical structure of UI design elements and usability principles related to mobile phones were developed and then utilized to develop the checklist. In order to demonstrate the practical effectiveness of the proposed checklist, comparative experiments were conducted on the usability checklist and usability testing. Majority of usability problems found by usability testing and additional problems were discovered by the proposed checklist. It is expected that the usability checklist proposed in this study could be used quickly and efficiently by usability practitioners to evaluate the mobile phone UI in the middle of the mobile phone development process.

• 한국멀티미디어학회논문지
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• 제12권10호
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• pp.1450-1456
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• 2009

정보통신 기술의 발달로 휴대전화는 수많은 기능을 내장하였고, 누구나 손쉽게 사용할 수 있는 환경이 조성되었다. 그러나, 휴대전화의 대표적인 기능인 카메라 기능을 이용하여 기업 내부 정보 유출, 개인 사생활 침해 등의 범죄들이 빈번하게 발생하고 있다. 본 논문에서는 휴대전화 내의 사진 특성 분석을 통한 휴대전화 증거 분석 방안을 제안을 그 목표로 한다. 이를 위하여 디지털 사진에 대한 특성을 분석하고, 휴대전화 모델에 따른 고유의 특성을 데이터베이스화한다. 제안 방안은 디지털 사진을 통하여 휴대전화의 제작사 및 모델을 정확하게 판단함으로써 디지털 증거 자료를 확보하는데 기여할 수 있다.

• 대한산업공학회지
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• 제32권2호
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• pp.111-119
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• 2006

In the last decade, the research of the usability of mobile phones has been a newly evolving area with few established methodologies and realistic practices that ensure capturing usability in evaluation. Thus, there exists a growing demand to explore appropriate evaluation methodologies that evaluate the usability of mobile phones quickly as well as comprehensively. This study aims to develop a task-based usability checklist based on heuristic evaluation in views of mobile phone UI practitioners. A hierarchical structure of UI design elements and usability principles related to mobile phones were developed and then utilized to develop the checklist. In order to demonstrate the practical effectiveness of the proposed checklist, comparative experiments were conducted on the usability checklist and usability testing. A majority of usability problems found by usability testing and additional problems were discovered by the proposed checklist. It is expected that the usability checklist proposed in this study could be used quickly and efficiently by usability practitioners to evaluate the mobile phone UI in the middle of the mobile phone development process.

• 대한인간공학회지
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• 제26권3호
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• pp.117-124
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• 2007

A few people are frequently using Korean text entry function in the mobile phone. To make matters worse, too many kinds of Korean text entry methods exist in the market, compelling mobile phone users to learn how to input texts all over again, whenever they purchase a new mobile phone. The purpose of this study is to propose a universal design of Korean text entry method for mobile phones. Several experiments and several questionnaire surveys were conducted in order to induce design factors for the universal design. Participants were mobile phone users with the diverse levels of text entry expertise and with the diverse ages. The results of this investigation were identical, irrespective of participants' age and expertise. The efficiency of the text entry method was not more important factor than memorability. The layout of vowels to keypad was preferred to map just 3 strokes to the 3 buttons so that users can make for themselves vowels that they want to input. The preference on the consonants layout was different according to investigation methods. According to the survey, it was preferred that consonants were arranged by alphabet order. However, the result of text entry speed measurement was that the arrangement by alphabet order was not superior to the typical arrangement. Such results may be used to design mobile phones for diverse users.