• Journal of the Korean Institute of Telematics and Electronics
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• v.21 no.1
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• pp.13-24
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• 1984

This paper presents the measurements and analyses of transmission qualities of the existing urban and toll public switching telephone network (PSTN) for the purllose of opening it to data transmission. In the tests, random noise and impulsive noise occuring on the telephone network are investigated and bit error rate and block error rate representing the transmission qualities on the existing telephone network are measured. We recommend the fastest practical data transmission speed on the network and investigate a possibility of opening the public switching telephone network (PSIN) to the data transmission based on the above measurements.

• The Journal of Korean Association of Computer Education
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• v.16 no.5
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• pp.17-29
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• 2013

Cyberbullying has a negative influence on teens. However, the academic approach and try is still an its early stages in spite of the issue of the seriousness and importance. Accordingly, this study conducted a survey of 1,112 elementary, middle and high school students. According to the survey, Internet bullying violence experience was from 20.3% to 39.0%, victim experience from 11.0% to 23.4%, mobile phone bullying violence experience was from 15.9% to 44.1%, victim experience from 5.5% to 21.8%. The factors affecting Internet bullying violence experience were gender, academic stress, internet accessibility, anonymity, use time of internet. The factors affecting mobile phone bullying violence experience were school table, academic stress, mobility, anonymity, use time of mobile phone. Finally, this study grasped the relation between Internet and mobile phone bullying. It was found that Internet bullying violence victim experience had something to do with mobile phone bullying violence victim experience. Especially, Internet bullying violence experience had a lot to do with mobile phone bullying violence experience, Internet bullying victim experience had a lot to do with mobile phone bullying victim experience.

• ETRI Journal
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• v.11 no.4
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• pp.37-49
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• 1989

본고에서는 우리나라 전화요금 전략수립에 일조하고자 전화통화의 수요탄력성을 시내통화와 시외통화로 나누어 추정하였다. 먼저 탄력성의 개념과 추정에 관하여 살펴보았으며, 아울러 제외국의 통화수요탄력성을 조사 분석하였다. 추정결과는 제외국에서의 일반적인 경향과 일치하며, 우러나라에서도 전화서비스가 필수품으로 정착되었음을 입증해 주고 있다.

• The Journal of the Korea Contents Association
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• v.15 no.5
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• pp.340-352
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• 2015

The purposes of this study is to analyze gender difference in predictors of mobile phone dependency in youth. The analysis is performed with third-year panel survey data of middle school 1st grade students from Korean Child-Youth Panel Survey. The results are as follows. First, the female students' mobile phone dependency is more serious than the male students' mobile phone dependency. Second, while the identified male gender predictors are aggression, parental abuse, aprosexia, study activity and social withdrawal, the identified female gender predictors are depression, aprosexia, aggression, study activity and social withdrawal. Based on these results, theoretical and practical implications in planning of prevention or intervention of mobile phone dependency are proposed.

• Journal of Korean Institute of Fire Investigation
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• v.6 no.1
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• pp.31-36
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• 2005

휴대용 이동전화(Mobile Phone)의 편리성 등에 의해 이동전화의 보급률이 증가하고 있다. 이에 따라 이동 전화 기기(핸드폰)에 사용되는 배터리에서의 폭발이나 화재사고의 발생률이 증가되고 있어 이로 인한 사고의 위험과 피해도 점차 증가되고 있는 실정이다. 본 연구에서는 현재 유통되고 있는 국내 외 배터리 팩 4종을 선별하여 배터리팩의 외부 단자 사이를 1시간 이상 길게 지속적으로 단락(긴 단락)시켜보고, 1초 간격으로 접촉과 해제를 200회 가량 반복하여 단락(짧은 단락)시켜 보았다. 또한, 배터리팩을 분해한 후 보호회로를 제거한 상태에서 셀의 양극과 음극을 금속으로 단락(내부 단락)시켜 셀의 방전실험을 하여, 이에 따른 방전특성과 온도상승에 대한 실험을 하였다. 이를 통해 핸드폰 배터리에서의 폭발 화재로의 발전가능성 및 위험성에 대해 살펴보았다.

• 방재와보험
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• s.144
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• pp.32-37
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• 2012

• The Journal of the Korea Contents Association
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• v.17 no.8
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• pp.39-52
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• 2017

The purpose of this study was to examine the mediating effects of mobile phone dependency in the relationship between parenting attitude and juvenile delinquency. This study used the secondary data from the $1^{st}$, $2^{nd}$ and $3^{rd}$ waves of the Korean Children and Youth Panel Survey(2010, KCYPS). The data of 2,086 middle school students were analyzed by utilizing Structural Equation Model(SEM). The results are as follows. First, positive and negative parenting attitudes had no direct effects on juvenile delinquency, while positive parenting attitudes had significantly decreased adolescents' mobile phone dependency. In addition, negative parenting attitudes had positive effects on adolescents' mobile phone delinquency. Second, mobile phone dependency was fully mediated by parenting attitudes and juvenile delinquency. On the basis of these results of study, policy and practice implications were discussed to reduce juvenile delinquency by improving parenting attitudes.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.295-298
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• 2010

There are three types of survey research system, telephone surveys, online surveys, interviews and so on. Currently most of the survey data have been verified by hand-collecting state in korea. Semi-automated research systems, some companies are using imported from abroad. This paper is the study on the design and implementation of linked research system for global standardization. The system is optimized through customizing for local conditions, as well as professionals for telephone surveys, online surveys, interviews even a normal user can enter the questionnaire easily and quickly. The result data is passed to the customer quickly and accurately. In particular, this system is based on automatic data input and collected provides best efficient analysis and statistics. Office programs and advanced statistical program SPSS is compatible with the maximum benefits for proposed system. Additionally, to achieve the import substitution effect through localization and to propose a global standard the proposed system is designed and implemented.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.199-201
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• 2001

최근 모바일 컴퓨팅 기술이 발전되면서, PDA 등과 같은 소형 컴퓨팅 장치가 빠른 속도로 보급되고 있다. PDA는 이동전화나 무선 LAN 등을 통해서 다른 PDA 또는 일반 컴퓨터에 접속해서 메일 수신, 인터넷, 채팅 등에 사용되고 있다. 우리는 PDA간 또는 PDA와 데스크탑 컴퓨터간의 음성통신 기능을 제공하는 음성 전화 시스템을 개발하였다. 본 논문은 우리가 개발한 음성 전화 시스템의 기능, 구조, 구현을 소개한다. 우리의 음성 전화 시스템은 Windows CE 환경 하에서 동작하고 H.323을 지원하도록 설계되어있다. 또한, 본 논문에서는 음성통신을 위한 송, 수신 버퍼 사용의 효율적인 방법을 제안한다. 우리의 조사에 의하면, Windows CE 기반의 음성전화시스템에 대한 기존 연구가 거의 발표되지 않았다.

• Journal of the Korea Convergence Society
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• v.10 no.8
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• pp.283-289
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• 2019

The purpose of this study was to classify the elementary school students to latent groups according to the type of mobile phone usage and to verify the relationship with mobile phone dependency. The latent profile analysis was conducted using the first grade panel data of the elementary school in the Korea Children 's Youth Panel in 2016. The results found 3 latent classes of mobile phone usage: family and friend concentration (Type1), family concentration low level (Type2) and essential (Type3). The results of multiple regression analysis for verifying the relationship between mobile phone use type and mobile phone dependency showed a significant effect. The Type 2 showed more dependency than the Type 1, and the Type 1 showed more dependency than the Type 3. These findings provided basis for the guideline of mobile phones use and for proper intervention to prevent mobile phone dependency for elementary school students.