• Information and Communications Magazine
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• v.30 no.7
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• pp.18-25
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• 2013

본고에서는 차세대 광 가입자를 위한 OFDMA-PON(Orthogonal Frequency Division Multiple Access Passive Optical Network)을 소개하고, 그 MAC(Medium Access Control) 기술에 대한 전반적 내용과 기 연구된 상향 자원 할당방법들에 대해 알아본다. 또한, OFDMA-PON 연구 동향을 바탕으로, 향후 MAC 기술을 전망한다.

• The Journal of Korean Institute of Next Generation Computing
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• v.8 no.2
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• pp.99-117
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• 2012

• The Journal of the Korea Contents Association
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• v.16 no.9
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• pp.460-472
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• 2016

The purpose of this study is to examine the factors affecting perceptions of successful aging and preparations for the later life among the baby boom cohort. The subject of survey is the baby boomer(from 1955 to 1963) and it was done from May 1 to September 15 in 2016. 814 self-reported questionnaires were used for final analysis by SPSS WIN18. The major results of this study were as follows: First, there were differences in the perception of successful aging by education level, subjective awareness of economic status, subjective awareness of health condition, marriage status. Second, there were differences in the preparations for the later life by education level, job, subjective awareness of economic status, subjective awareness of health condition. Third, The higher perception of successful aging was deserved to significantly affect preparations for the later life.

• Journal of Korea Game Society
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• v.10 no.6
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• pp.25-35
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• 2010

The generation who have had experienced computer games while growing up, are called game generation. The game generation has quite different styles of thinking and behavior from other generations. But present education methods for the game generation are not basically different from the education methods for other generations. Prensky argued that digital game-based learning is one of the few ways to meet the needs of the information age for the game generation. In this paper, we analyze the suitability of 4 design methods for educational games in comparison which were selected by the literatures survey. The suitability analysis was performed on the overall design method, the game design method, the education design method, the explicit of the design method, and the pros and cons. We suggest research topics on design methods for educational games which are needed to research in the future, based on the analyzed results.

• 한국해양학회지
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• v.30 no.2
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• pp.138-146
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• 1995

Present study was performed to describe the growth of Leptochela gracilis (STIMPSON, 1860), the dominant species of the coastal water near Kanghwa Island, Korea. Samples were collected from 1 sampling point by long bag seine net at monthly interval from April 1993 to January 1994 except for August 1993. In the population study of Leptochela gracilis, ovigerous female has appeared from April to September 1993 and the ratio (egg-bearing female/female) showed over 70% from May to July 1993. Female individuals were predominant from May 1993 to January 1994 and it was found that sex ratios were not significantly different between pregnant and non-pregnant period(p>0.05). The population of Leptochela gracilis was divided into 2 types of generation; i) short term generation. and ii) long term generation. Longevity of the long term generation was presumed to vary from 12 to 15 months. In the case of short term generation, spawned by egg-bearing stock of September, however, it was not certain whether they absorbed in the long term generation, thus overcome winter season or die after December by environment factors. The growth in cavalcade length of the long term generation was better fitted to Pauly and Gaschutz model than Von Bertalanffy.

• The Journal of the Korea Contents Association
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• v.22 no.9
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• pp.205-216
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• 2022

This study investigated the experiences of baby boomers' social participation through social contribution jobs after retirement, using content analysis. The baby boomers who participated in social contribution jobs after retirement showed a strong desire to work, and were provided with rewarding and self-development, which resulted in family members viewing job participation positively. In addition, through self-help groups and communities, they shared information for the program and formed a social relationship. However, they expressed dissatisfaction with the instability and discontinuity of the job with low salary, with job interview repeated every year. As for the future direction, it is necessary that jobs utilize the skills and expertise of the baby boomers, the bridging jobs as an income guarantee after retirement, and the promotion of industries with marketability and publicness through institutional and regulatory reform. It is emphasized that the human resources of the retired baby boomers should be actively utilized with the governmental support.

• Korean Journal of Social Welfare
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• v.60 no.2
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• pp.53-76
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• 2008

This study analyze the intergenerational transmission of poverty in Korea, using the first wave of Korea Welfare Panel Study. For this analysis, I produced poverty transition tables across generation and estimated logistic models to explore the effects of parent's poverty on the children's adulthood poverty. As the results, I found that parent's poverty reduced children's education level and then the low education level increased the likelihood that children experience poverty in their adulthood. In other words, parent's poverty might increase children's adulthood poverty through the mediating effects of education level. This mediating effects were also identified in the analyses by group and cohort. From the analyses by group, daughters rather than sons, those from urban rather than rural area, and the older cohort rather than younger cohort showed greater intergenerational transmission of poverty.

• Journal of Korea Society of Industrial Information Systems
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• v.20 no.2
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• pp.125-131
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• 2015

The purpose of this study is to analyze the relationship of information literacy, life satisfaction, and life happiness of the silver generation, and to suggest the direction for their happy life. We conducted a questionnaire survey targeted at the Internet users of over 60 years old adults living in Daegu/Gyongbuk areas. Data were analyzed using 238 valid samples. With the results, it revealed that the silver generations' life satisfaction fully mediates the relationship between their information literacy and their life happiness. Future studies are also discussed in this paper.

• Current Industrial and Technological Trends in Aerospace
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• v.8 no.1
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• pp.86-95
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• 2010

Flight termination system(FTS) is used to terminate safely the launch vehicle's flight when it faces an emergency situation by transmitting termination command from ground FTS. RCC standard IRIG tone method has been used widely for FTS commands method in foreign ranges and Naro Space Center, but this method has a weakness for security of command signal. Therefore RCC had studied more secured EFTS standard and chose CPFSK digital modulation method. This paper describes basic concept and types of FTS and FTS types which foreign ranges had applied and describes standardization of EFTS in the U.S. based on RCC EFTS study reports.

• JOURNAL OF ELECTRICAL WORLD
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• s.255
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• pp.62-69
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• 1998

이동체통신시스템은 디지털방식에의 전환이 진전되어 음성통신에서 멀티미디어 통신으로의 기대가 높아지고 있다. 또 공중이동체통신에서는 앞으로도 큰 수요가 예상되고 있는데 이를 배경으로 생활공간의 확대, 경제활동의 다양화에 따라 이동체통신의 즉시성$\cdot$간편성 등이 평가를 받아 여러 세대층에서 이용이 확대되는 등, 정보통신의 역할과 중요성이 증대된 것을 들 수 있다. 1996년말 현재 1억 3630만명이 100개국 이상의 국가에서 휴대전화를 이용하고 있다. 한편 일본의 PHS를 포함하는 휴대전화 가입자수는 ''97년 6월에 3000만을 초과, 보급률로는 구미각국의 수준에 근접하고 있다. 현재 실용화 되고있는 CDMA 등의 휴대전화방식에 비하여 가입자 수의 증가에 대처할 수 있도록 G율적이면서 대용량의 통신을 할 수 있는 방식에 대한 검토$\cdot$연구가 각국에서 행해지고 있다. 그 중 하나가 INT-2000(FPLMTS)방식의 차세대통신시스템으로, 2000년의 실용화를 목표로 일본, 구주, 미국이 각각 차차세대의 고속무선액세스시스템, 차세대 LEO를 이용한 이동체위성통신시스템 등과 함께 상호의 연대를 포함한 검토$\cdot$연구가 추진되고 있다. 이 차세대 통신시스템에서는 세계 각국의 통신방식을 통일하여 하나의 휴대단말을 공통으로 사용할 수 있고 아울러 멀티미디어통시네의 적용이 가능한 방식이 되도록 검토하고 있다. 한편 일본에서는 업무용 이동체통신시스템에서도 디지털화가 진전되어 음석중심의 서비스에서 멀티미디어통신으로 옮겨가고 있다.