• ETRI Journal
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• 제35권6호
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• pp.1075-1083
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• 2013

This paper describes an ultra-wideband (UWB) antenna that uses a ring resonator concept. The proposed antenna can operate in the entire UWB, and the IEEE 802.11a frequency band can be rejected by inserting a notch stub into the ring resonator. The experiment results indicate that the measured impedance bandwidth of the proposed antenna is 17.5 GHz (2.5 GHz to at least 20 GHz). The proposed UWB antenna has omnidirectional radiation patterns with a gain variation of 3 dBi (1 dBi to 4 dBi).

• ETRI Journal
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• 제35권2호
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• pp.253-258
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• 2013

We propose and demonstrate an efficient power-saving optical network unit (ONU) based on upstream traffic monitoring for 10-Gb/s wavelength division multiplexed passive optical networks (WDM-PONs). The power-saving mode controller uses a ${\mu}$-processor and traffic monitoring modules followed by the proposed power-saving processes to operate the sleep mode ONU. The power consumption of the ONU is effectively reduced from 19.3 W to 6.4 W when no traffic from the users is detected. In addition, we design a power-saving mechanism based on a cyclic sleep mode operation to allow a connectivity check between the optical line terminal and ONU. Our calculation results show that the WDM-PON ONU reduces the power consumption by around 60% using the proposed mechanism.

• ETRI Journal
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• 제37권4호
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• pp.657-666
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• 2015

We propose a two-stage resource allocation algorithm for the high link utilization of an orthogonal frequency-division multiplexing passive optical network (OFDM-PON). An OFDM-PON is assumed to use a synchronous frame structure in supporting service differentiation. In distributing resources, the proposed algorithm first allocates a time window for each optical network unit (ONU), and then it arranges a subchannel, which is a group of subcarriers. This algorithm needs to satisfy two constraints. First, computations for the resource allocation should be done using a frame unit. Second, an ONU has to use a single subchannel to send upstream data for multiple services within a frame duration. We show through a computer simulation that the proposed algorithm improves the link utilization.

• Journal of the Korean Data and Information Science Society
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• 제28권2호
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• pp.261-270
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• 2017

본 연구는 보건계열 대학생을 대상으로 인터넷 중독성향, 인터넷 윤리의식 및 자기 통제력의 정도를 파악하고 자기 통제력의 매개효과를 검증하였다. 서술적 조사 연구로써 D시에 소재한 5개 대학교의 보건계열 재학생으로서, 인터넷 채팅으로 하루 평균 1시간 이상을 소요하고 있는 대학생 236명을 대상으로 2016년 3월 5일 부터 4월 30일 까지 설문지를 이용하여 자료 수집하였고, SPSS/WIN 21.0 프로그램을 이용하여 빈도, 백분율평균과 표준 편차 등의 기술 통계, 피어슨 상관계수 (Pearson's correlation coefficient), Baron과 Kenny (1986)의 매개 효과 검증 절차 및 소벨 검정(Sobel test)로 통계 처리하였다. 연구 결과, 보건계열 대학생의 인터넷 중독성향과 인터넷 윤리의식 관계에서 자기 통제력이 매개효과를 가지고 있음을 확인하였다. 이에 보건계열 대학생의 인터넷 중독성향으로 인해 낮아진 인터넷 윤리의식을 높이기 위해서는 인터넷 중독성향을 감소시키거나 예방하는 것이 필요하며, 인터넷 중독성향과 인터넷 윤리의식의 관계에서 매개효과를 보이는 자기 통제력이 인터넷 윤리의식을 높이기 위한 중요한 예측요인으로 다루어져야 함을 시사하였다.

• 한국비블리아학회지
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• 제16권1호
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• pp.27-43
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• 2005

본 연구에서는 미국 공공도서관의 인터넷서비스 이용자들의 서비스 이용 수준 및 현황에 대하여 살펴봄으로써 공공도서관에서의 인터넷서비스가 어느 단계에 이르고 있는지를 검토하였으며 인터넷 정보이용능력 지도에 대한 필요성을 논의하였다. 미국 중서부에 위치한 4개 공공도서관의 인터넷서비스 이용자를 설문 조사하여 수집된 386부의 설문지를 분석한 결과 인터넷 경험이 적은 인터넷 초보자의 서비스 만족도가 인터넷을 다년간 사용한 중급이나 고급 수준의 이용자에 비해 월등히 높은 것으로 나타났으며 인터넷 사용 강좌를 택한 경험이 있는 이용자의 서비스 만족도가 인터넷 사용 강좌를 한번도 택하지 않은 경우보다 높은 것으로 밝혀졌다. 이러한 연구 결과를 바탕으로 미국 공공도서관의 인터넷서비스 이용자를 위한 정보 이용능력 지도의 개발을 위한 방향과 지침이 제시되었다.

• 대한한방소아과학회지
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• 제22권2호
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• pp.51-67
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• 2008

Objectives : The purpose of this study is to research the internet addiction and the Weak children. Methods : Total 400 of 5th and 6th grade JeonJu Elementary student children consisted with 203 men, 197 women were chosen for this study. They answered questionnaires of the internet addiction and the Weak children on June 12th, 2008. Results : 75% were general internet user, latent danger user group was 14.7%, high danger user group was 10.3%. The mean of the general weak children was the highest and then the group of children who had Heart, the Lung, the Liver, the Spleen, the Kidney problems were followed. These showed the relationships with living styles, especially eating patterns and parents' concerns about children's internet use. The more serious internet addiction was, the more the weaker children symptoms were answered significantly. The heart weak children symptoms were found in latent-high danger internet user group. Conclusions : In conclusion, the physical and psychological symptoms of the internet addiction children were resulted by the disturbance of Qi and the pathological change of internal organs.

• 디지털콘텐츠학회 논문지
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• 제14권3호
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• pp.343-348
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• 2013

본 연구의 목적은 영어 쓰기 학습 향상을 위한 도구로서 인터넷 활용과 소프트웨어의 영어 수업에 도입함으로써 얼마나 효과적이고 효율적인 교육이 될 수 있는지 연구하고자 한다. 첫째로 영어 쓰기에 관한 기존 연구들의 비교 분석과 연구 배경을 기술하고 둘째, 인터넷 도구들을 이용하여 영어 쓰기 과제 학습에 얼마나 효율적인지 기술하고자 한다. 이것은 인터넷 게시판에 주어진 어휘나 동사들을 가지고 문장을 완성해가는 과제를 예로 들 수 있다. 셋째, 이 연구는 인터넷 도구와 소프트웨어를 이용할 경우 오프라인 수업과 비교하여 학습자의 수업 태도와 적극성에 어떠한 변화가 있는지 비교 분석하고자 한다. 오프라인 수업에서와는 달리 웹사이트, IRC (Internet Relay Chat), 다양한 인터넷 도구와 여러 영어 말하기 및 듣기 실력향상을 위한 다양한 소프트웨어 활용이 학습자의 쓰기 실력 향상과 태도에 있어서 매우 중요한 영향을 미치고 있음을 알 수 있다.

• International Journal of Knowledge Content Development & Technology
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• 제9권2호
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• pp.7-31
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• 2019

This study was conducted to investigate the awareness and utilization of the Internet resources and services for academic activities by the academic staff of tertiary institutions in Adamawa State. The researchers adopted a quantitative research method using cross-sectional survey design to collect data from the respondents. Multi-stage sampling techniques were used. Three hundred and thirty-three (333) copies of the questionnaire were administered to the respondents in the eight (8) sampled institutions and two hundred and ninety-two (292) respondents representing (87.6%) were returned and found useful. The data collected were analyzed using descriptive and inferential statistics by the use of SPSS version 20.0. The findings revealed that respondents were aware of all the Internet resources, (e-books, e-journals, and online databases), but regarding the Internet services, they were mostly aware of only the e-mail. The study further found that online database and e-mail as the most Internet resources and services utilized by the respondents. There are inverse and weak relationship between awareness and utilization of the Internet resources and services by the academic staff of tertiary institutions in Adamawa State. The study recommends increase awareness and use to other Internet resources such as the e-books and e-journal and Internet services, especially Usenet, Discussion group and Telnet by the management of the institutions through training, workshops/conferences for better academic activities.

• Child Health Nursing Research
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• 제10권1호
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• pp.48-58
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• 2004

Purpose: Internet addiction is a newly recognized problem in the adolescents. The purpose of this study was to identify and analyze the educational needs for Internet addiction in middle school students of Korea. Method: The subjects of this study were 450 middle school students. The data were collected from open and structured questionnaire about the educational needs for Internet addiction. Result: As a result of content analysis of educational needs for Internet addiction, 9 domains and 19 themes were categorized from 542 statements. 9 Domains are : Definition, Etiology, Status, Process, Diagnosis, Influence, Coping and Prevention of Internet Addiction and General Information of Internet Use. These results were revealed that middle school students had comprehensive education needs for Internet Addiction. Also, there were the difference of need contents and frequency between school boy and girl students. Most of students had high educational needs for Internet addiction based on school health care program. Conclusion: It would be necessary to develop on Internet addiction prevention program for adolescents concerning these findings. In the future, there should be study to identify the psychological characteristics of adolescent associated with Internet addiction.

• Child Health Nursing Research
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• 제10권4호
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• pp.406-412
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• 2004

Purpose: This study was done to identify the level of Internet addiction among adolescents, and to examine factors affecting Internet addiction in adolescents. Method: The participants in were 475 high school students. Data were analyzed using multiple regression analysis to examine the factors affecting Internet addiction in adolescents. Result: The overall Internet addiction scale score was 63.83(±20.48). The differences of Internet addiction according to student characteristics were found to be significant for sex and grade. The level of Internet addiction was positively related to the level of impulsiveness and depression. The level of Internet addiction was negatively related to the level of social support. Factors such as impulsiveness and social support were examined as significant factors predicting Internet addiction in adolescents. Conclusion: Based upon these findings, factors affecting Internet addiction in adolescents include impulsiveness and social support. The findings provide further justification for interventions targeting key factors that influence Internet addiction in adolescents in addition to providing adolescents with necessary communication, negotiation and other life skills.