• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.24 no.10
• /
• pp.1017-1026
• /
• 2013

Four countries are participating in exposure assessment for Mobi-Kids Study. Each country evaluates RF and ELF exposure from mobile phones considering telecommunication system and environment in the corresponding area. The results will be used to determine accumulation exposure level of each subject in case and control groups to assess the potential carcinogenic effects of childhood and adolescent exposure to radio frequency(RF) and extremely low frequency( ELF) from mobile phones on the central nervous system. This paper analyzes exposure types of mobile phones which have been used in Korea for about 10 years, based on Mobi-Kids protocol. It includes investigation of mobile phone models released in the domestic market, design of numerical phone models to represent each exposure type, and measurement of ELF radiation from mobile phones.

• Journal of Family Resource Management and Policy Review
• /
• v.13 no.3
• /
• pp.281-305
• /
• 2009

The purpose of this study was to investigate the effect of use motivation type for mobile phones and the degree of loss perception related to mobile phone consumption consciousness in adolescents. The subjects of this study were 503 students in middle and high school in Daegu. A questionnaire was used for the survey. Factor analysis, cluster analysis, and MANOVA were employed for the data analysis and the $Scheff\acute{e}$ test was used for post-hoc analysis. The results are as follows: First, there are significant differences in mobile phone consumption consciousness in all sub-dimension areas according to use motivation type for mobile phone. Second, adolescents with high economic loss perception for mobile phones show high consumption consciousness in sub-dimension area, and adolescents with high academic loss perception show high relation-oriented consumption consciousness. Adolescents with high physical loss perception show high health-oriented, relation-oriented, and function-oriented consumption consciousness. Adolescents with high psychological loss perception, on the other hand, show high relation-oriented consumption consciousness. Third, there are significant differences in mobile phone consumption consciousness according to use motivation type for mobile phones and the degree of overall loss perception. However, there are no significant differences in the mobile phone consumption consciousness according to use motivation type for mobile phones and the degree of overall loss perception.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2010.10a
• /
• pp.574-576
• /
• 2010

This paper describes constructing methods of environments for the App development using v smart-phones which are widespread rapidly. Various smart-phones and operating systems are used all over the world. In this paper, we will deal with three kinds of smart-phones, that is Windows Mobile Phone(recently Windows Phone7), iPhone and Android Phone using respective operating systems which are widespread in the domestic market.

• Journal of Korean Society for Quality Management
• /
• v.39 no.3
• /
• pp.422-431
• /
• 2011

The number of mobile telecommunication service subscribers has been over 50 millions as of the end of Nov. 2010. And the number of used mobile phones has been growing continuously caused by shortened life cycle of products and competing between service providers, which is about 21 millions for only one year, 2010 in Korea. However, the quality level of reverse logistics network for used mobile phones is very low and statistics show that the collection ratio of them has not been over 40%. The current low collection ratio can be one of the significant causes of environment destruction due to the cumulated growth. Accordingly new practical alternative recovery systems are required in addition to the current one with EPR(Extended Producers Responsibility). In this paper, suggested are alternative policies to improve the quality level of reverse logistics network for used mobile phones effectively. ENR(Extended Network service providers Responsibility) is representative of them.

• Journal of the Korean Society for information Management
• /
• v.34 no.3
• /
• pp.89-107
• /
• 2017

This study aims to compare information seeking behavior of 1300K users on PC and mobile phone. Transaction logs of 1300K, a major Korean shopping search engine, were analyzed. These transaction logs were collected over 1 month period, from April 1 to April 31, 2016. The results of this study show that there are a little more mobile sessions than PC sessions. Users conducted slightly more browsing on PCs than mobile phones, whereas users submitted queries more than two times on mobile phones than on PCs. Users clicked more search results on PCs than mobile phones, whereas users made important decision makings such as product purchases more on mobile phones than PCs. Top queries and categories were similar between PCs and mobile phones. Queries and categories on mobile phones were more focused than queries on PCs. Overall, mobile search behavior is more simple, passive, and focused than PC search behavior. The results of this study can be implemented to the effective improvement and development of search services for different devices.

• Survey Research
• /
• v.3 no.1
• /
• pp.53-63
• /
• 2002

In this paper we realized an organization of Mobille Phones Survey system and simulated how to make questionnaires in mobile phones with an example. We show a question making program in a simulator with WML(Wireless Markup Language)

• 한국HCI학회:학술대회논문집
• /
• 2006.02a
• /
• pp.909-917
• /
• 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.

• Journal of Korea Multimedia Society
• /
• v.12 no.10
• /
• pp.1450-1456
• /
• 2009

By the explosive growth of IT technologies, mobile phones have embedded a lot of functions and everyone can use them with facility. But there are various cybercrimes as invasions of one's privacy or thefts of company's sensitive information using a built-in digital camera function in a mobile phone. In this paper, we propose a scheme for analyzing evidences by digital pictures on mobile phones. Therefore we analyze the features of digital pictures on mobile phones and make databases of characteristic patterns based on the vendor and the model of mobile phone. The proposed scheme will help to acquire digital evidences by providing a better decision of the vendor and/or the model of mobile phone by cybercrime suspects.

• Journal of Korean Institute of Industrial Engineers
• /
• v.32 no.2
• /
• pp.111-119
• /
• 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.

• Journal of the Ergonomics Society of Korea
• /
• v.26 no.3
• /
• pp.117-124
• /
• 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.