• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2012년도 추계학술대회
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• pp.256-258
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• 2012

최근 LED를 이용한 IT 기술이 많은 관심을 받고 있으며, 특히 무인시설물에서는 효율적으로 LED를 관리해야하기 때문에 통신 및 조명 제어기술에 대한 연구가 활발히 진행 중에 있다. 그러나 LED 특성상 FOI(Filed of Illumination)의 제약이 따르기 때문에 서비스의 범위와 커버리지가 제한적이라는 한계를 가지며, LED 제어의 경우 최근 스마트단말을 이용한 기술이 많이 보급되고 있으나 수많은 스마트단말의 OS 플랫폼에 종속적으로 프로그램을해야만 하는 번거로움이 있기 때문에 개발 비용적인 측면에서도 매우 비효율적이다. 따라서 본 논문에서는 LED 기반 IT기술의 서비스 이용범위를 유연하게 넓힐 수 있는 LED 지향각의 원격제어 기술을 제안하고, 단말환경에 독립적으로 효과적인 LED제어를 가능하게 하는 차세대 웹표준인 HTML5(Hypertext Mark-up Language 5)기반의 시스템을 제안하였으며, 제안 기술의 핵심 프로그램을 제시하고 시뮬레이션을 수행함으로써 유용성을 입증하였다.

• ETRI Journal
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• 제35권2호
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• pp.245-252
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• 2013

In this work, we study the physical layer solutions for 10-gigabit-capable passive optical networks (PONs), particularly for an optical link terminal (OLT) including a 10-Gbit/s electroabsorption modulated laser (EML) and a 2.5-Gbit/s burst mode receiver (BM-Rx) in a novel bidirectional optical subassembly (BOSA). As unique features, a bidirectional mini-flat package and a 9-pin TO package are developed for a 10-gigabit-capable PON OLT BOSA composed of a 1,577-nm EML and a 1,270-nm avalanche photodiode BM-Rx, including a single-chip burst mode integrated circuit that is integrated with a transimpedance and limiting amplifier. In the developed prototype, the 10-Gbit/s transmitter and 2.5-Gbit/s receiver characteristics are evaluated and compared with the physical media dependent (PMD) specifications in ITU-T G.987.2 for XG-PON1. By conducting the 10-Gbit/s downstream and 2.5-Gbit/s upstream transmission experiments, we verify that the developed 10-gigabitcapable PON PMD prototype can operate for extended network coverage of up to a 40-km fiber reach.

• Clinical and Experimental Pediatrics
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• 제57권2호
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• pp.55-66
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• 2014

The 7-valent pneumococcal protein conjugate vaccine (PCV7) has been shown to be highly efficacious against invasive pneumococcal diseases and effective against pneumonia and in reducing otitis media. The introduction of PCV7 has resulted in major changes in the epidemiology of pneumococcal diseases. However, pneumococcal vaccines induce serotype-specific immunity, and a relative increase in non-vaccine serotypes has been reported following the widespread use of PCV7, leading to a need for extended serotype coverage for protection. PCV10 and PCV13 have been licensed on the basis of noninferiority of immunogenicity compared to a licensed conjugate vaccine. In this article, we aimed to review important data regarding the efficacy and effectiveness of the extended-coverage PCVs published or reported thus far and to discuss future implications for pneumococcal vaccines in Korea. After the introduction of PCV10 and PCV13, within a short period of time, evidence of protection conferred by these vaccines against invasive and mucosal infections caused by most of the serotypes included in the vaccines is accumulating. The choice of vaccine should be based on the changes in the dynamics of pneumococcal serotype distribution and diseases in the region where the vaccines are to be used. Continuous surveillance is essential for the appropriate use of pneumococcal vaccines and evaluation of the impact of PCVs on pneumococcal diseases.

• 대한전자공학회논문지SD
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• 제38권2호
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• pp.145-153
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• 2001

조합회로에 대한 ATPG 알고리듬이 효율적으로 100%의 고장 검출율을 달성할 수 있게 되어 감에 따라서 고장 검출율을 그대로 유지한 상태에서 테스트 패턴을 줄이는 압축 기법의 중요성이 점차로 부각되고 있다. 본 논문에서 제시하는 알고리듬은 고장들간의 독립과 양립 관계에 기초해서, 압축된 테스트 패턴을 위해서는 양립할 수 있는 고장 집합의 크기를 크게 해야 하므로, 고장-패턴 쌍과 고장들간의 독립과 양립 관계를 이용해서 고장-패턴 쌍의 트리 구조를 생성하였다. 이 고장-패턴 트리를 바탕으로 해서 효율적으로 압축된 테스트 패턴을 생성할 수 있었고, ISCAS 85와 ISCAS 89 측정 기준 회로에 대한 결과로 제시된 알고리듬의 우수성을 검증하였다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제17권1호
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• pp.56-64
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• 2017

In this paper, an advanced ZigBee (AZB) system for internet-of-things (IoT) applications is proposed which can support various data rates from 31.25 Kbps to 2 Mbps, and the implementation results of the AZB baseband processor are presented. Repetition coding for 32-chip direct-sequence spread spectrum (DSSS) symbol is applied for low rates under 250 Kbps to extend the coverage. Convolution coding, puncturing, and interleaving for non-DSSS symbol are performed for high rates from 500 Kbps to 2 Mbps for multi-media services. Simulation results show that the coverage increases at the rate of 51.8-77.3% for various environments compared with IEEE 802.15.4 ZigBee. AZB baseband processor was implemented in 180 nm CMOS process and total gate counts are 260K with the size of $5.8mm^2$.

• Asian review of World Histories
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• 제2권1호
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• pp.81-104
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• 2014

The popular uprisings that took place in the Arab world, and led to the overthrow of four heads of states, namely Zine El-Abidine Ben Ali (January 14, 2011) of Tunisia, Hosni Mubarak (February 11, 2011) of Egypt, Muammar al-Gaddafi (August 23, 2011) of Libya and Ali Abdullah Saleh (November 23, 2011) of Yemen, have attracted the attention of the world media and policy makers in the West and the Middle East, and triggered their concern for the political future of the region. This article does not offer a comprehensive assessment of these uprisings, but rather analyzes the coverage of Time and Newsweek of the underlying causes of the uprisings and their anticipated consequences. It also investigates how the two magazines have highlighted the scenarios that may pose a real challenge to Arab regimes supported by the American administration, and internationally reshape the priorities of American foreign policy in the region. These issues are examined from the two magazines' perspectives, which under line the features of U.S. foreign policy in the region, where the White House is more concerned about the security of the state of Israel, control of the Arab oil and suppression of "Muslim fundamentalism."

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2007년도 공동학술대회 논문집
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• pp.209-214
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• 2007

In Korean geology that crystalline rock is dominant, the properties of subsurface including the anisotropy are distributed complexly and changed abruptly. Because of such geological environments, cross-hole seismic traveltime tomography is widely used to obtain the high resolution image of the subsurface for the engineering purposes in the geotechnical sites. However, because the cross-hole tomography has a wide propagation angle coverage relatively, its data tend to include the seismic velocity anisotropy comparing with the surface seismic methods. It can cause the misinterpretation that the cross-hole seismic data including the anisotropic effects are analyzed and treated with the general processing techniques assuming the isotropy. Therefore, we need to consider the seismic anisotropy in cross-hole seismic traveltime tomography. The seismic anisotropic tomography algorithm, which is developed for evaluation of the velocity anisotropy, includes several inversion schemes in order to make the inversion process stable and robust. First of all, the set of the inversion parameters is limited to one slowness, two ratios of slowness and one direction of the anisotropy symmetric axis. The ranges of the inversion parameters are localized by the pseudo-beta transform to obtain the reasonable inversion results and the inversion constraints are controlled efficiently by ACB(Active Constraint Balancing) method. Especially, the inversion using the Fresnel volume is applied to the anisotropic tomography and it can make the anisotropic tomography more stable than ray tomography as it widens the propagation angle coverage.

• 방송공학회논문지
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• 제8권2호
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• pp.126-135
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• 2003

디지털 본 방송 실시 이후 디지털 방송의 수신 환경 및 수신성능을 개선하기 위해 다양한 실제 전파 수신 채널 환경에 대한 분석을 수행할 필요성이 높아지고 있다. 본 논문에서는 디지털 신호처리 기법과 고속의 하드디스크 저장 기술을 이용하여 지상파DTV의 RF신호를 실시간으로 저장 및 재생하는 시스템을 설계, 제작하고 그 성능을 분석하였다. 개발된 시스템은 DTV RF 수신신호를 하드디스크에 실시간으로 저장 및 재생하기 때문에 특정지역의 실제 전파 수신환경을 매번 측정, 분석하는 번거로운 작업을 없앨 수 있을 뿐만 아니라 기존 수신기로 수신이 곤란한 지역들의 채널 환경을 저장하거나 특정 RF신호 패턴을 저장하고 이를 실험실에서 반복적으로 재생함으로 DTV 수신기의 성능을 측정하거나 각 지역의 채널 환경을 분석하는데 효율적으로 활용될 수 있을 것이다.

• 한국융합학회논문지
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• 제8권11호
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• pp.151-158
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• 2017

청소년의 인플루엔자 예방접종은 지역사회의 인플루엔자 확산 방지에 중요하다. 따라서 본 연구에서는 국민건강영양조사 제 6기 자료를 이용하여 청소년의 인플루엔자 예방접종에 영향을 미치는 개인 요인과 부모 요인을 알아보고자 하였다. 연구대상은 만 12-18세 청소년 1,020명과 그 어머니 884명, 아버지 557명이었다. 분석을 위해 Rao-Scott $x^2$, 다중회귀분석을 실시하였다. 청소년의 인플루엔자 예방접종률은 26.2%로 매우 낮았고, 청소년의 연령이 적을수록, 최근 2주간 몸이 불편했던 경험과 폐렴 과거력이 있으며, 자동차 앞좌석 안전벨트를 착용하는 경우 인플루엔자 예방접종률이 높았다. 또한 부모의 연령이 적을수록, 부모 본인이 인플루엔자 예방접종을 한 경우 청소년의 인플루엔자 예방접종률이 높았다. 우리나라 청소년의 인플루엔자 예방접종을 확대하기 위해서는 미디어와 의료인들은 청소년과 부모에게 인플루엔자 예방접종에 대한 교육이나 홍보를 통해 인플루엔자 예방접종에 관한 인식을 개선하고 다양한 융합적 중재를 제공해야 한다.

• Journal of Preventive Medicine and Public Health
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• 제53권2호
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• pp.126-134
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• 2020

Objectives: Cancer diagnoses have a tremendous impact on individuals and communities, drawing intense public concern. The objective of the current research was to examine news coverage and content related to cancer-related issues in Korean newspapers. Methods: Primarily using the database system of the Korea Press Foundation, we conducted a content analysis of 2806 articles from 9 Korean daily newspapers during a recent 3-year period from 2015 to 2017. Thematic categories, the types of articles, attitudes and tone, and the number of sources in each article were coded and classified. Results: Many news articles dealt with a diverse range of themes related to cancer, including general healthcare information, the latest research and development, specific medical institutions and personnel, and technology and products, which jointly accounted for 74.8% of all articles. Those thematic categories differed markedly in terms of article type, tone, and the number of cited sources. News articles provided extensive information about healthcare resources, and many articles seemed to contain advertising content. However, the content related to complex social issues such as National Health Insurance did not include enough information for the reader to contextualize the issues properly or present the issues systematically. Conclusions: It can be assumed that the media exert differential influence on individuals through news coverage. Within the present reporting framework, the availability and usefulness of information are likely to depend solely on individuals' capabilities, such as financial and health literacy; this dependency has a negative impact on knowledge gaps and health inequities.