• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.364-367
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• 2009

This paper presents a scheme that generates a caption file by extracting a Closed Caption stream from DTV signal. Note that Closed-Captioning service helps to bridge "digital divide" through extending broadcasting accessibility of a neglected class such as hearing-impaired person and foreigner. In Korea, DTV Closed Captioning standard was developed in June 2007, and Closed Captioning service should be supported by an enforcing law in all broadcasting services in 2008. In this paper, we describe the method of extracting a caption data from MPEG-2 Transport Stream of ATSC-based digital TV signal and generating a caption file (SAMI and SRT) using the extracted caption data and time information. Experimental results verify the feasibility of a generated caption file using a PC-based media player which is widely used in multimedia service.

• International Journal of Computer Science & Network Security
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• 제21권11호
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• pp.1-10
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• 2021

Cyberbullying has become a severe issue and brought a powerful impact on the cyber world. Due to the low cost and fast spreading of news, social media has become a tool that helps spread insult, offensive, and hate messages or opinions in a community. Detecting cyberbullying from social media is an intriguing research topic because it is vital for law enforcement agencies to witness how social media broadcast hate messages. Twitter is one of the famous social media and a platform for users to tell stories, give views, express feelings, and even spread news, whether true or false. Hence, it becomes an excellent resource for sentiment analysis. This paper aims to detect cyberbully threats based on Naïve Bayes, support vector machine (SVM), and k-nearest neighbour (k-NN) classifier model. Sentiment analysis will be applied based on people's opinions on social media and distribute polarity to them as positive, neutral, or negative. The accuracy for each classifier will be evaluated.

• International Journal of Advanced Culture Technology
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• 제12권1호
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• pp.158-168
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• 2024

With Wenhai big data SaaS cloud platform.2.0, this study analyzed data of 135 news reports relating to Chinese city Chongqing from Yonhap News Agency and ten South Korean mainstream newspapers from May 1^st, 2018 to September 30^th, 2022. Under the framework of Frame Theory, this research conducted data mining and analysis on how Korean mainstream media shaped city image of Chongqing, what kind of city images were shaped from dimensions of politics, economy, society, culture & sports as well as tourism and whether they are consistent with those in Chinese media. At the last part, discussions and suggestions was made.

• 융합보안논문지
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• 제10권3호
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• pp.1-7
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• 2010

최근 소셜 미디어(Social Media)는 유명 인사들의 사용이 늘어나면서 많은 관심과 함께 사용 인구가 급증 추세로 2009년 말 기준으로 전 세계 소셜 미디어 사이트 방문자수가 7억 7천만 명에 이르고 있다. 그러나 개인 프라이버시 침해, 악성코드 유포수단으로 악용 및 ID 도용 등 사회적인 문제가 나타나고 있다. 이러한 문제를 해결하기 위해 정부는 법 제도를 보완하고 관련 기업은 보안취약점 제거와 함께 불법정보 필터링 기능을 사용자는 개인정보보호 강화를 위한 노력과 관심을 기울여야 한다. 본 논문에서는 건전하고 안전한 소셜 미디어 사용 확산을 위한 보안대책 강구방안에 관해 모색해 보았다.

• 정보화정책
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• 제22권3호
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• pp.47-60
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• 2015

본 연구는 인터넷을 기반으로 하는 웹 캠페인이 전 세계적으로 확산되고 있으나, 인터넷 강국 한국에서는 <선거법> 규제로 인한 제약이 있다는 점에 주목해서 그 문제점과 해결 방안을 분석하고자 했다. 연구 결과, 첫째, <선거법> 제93조 제1항은 헌법재판소의 한정위헌 결정으로 상시적 웹 캠페인이 가능한데, 제59조와 제254조(선거운동기간위반죄)는 이와 달라 개정이 필요하다. 둘째, ISP에 대한 삭제 등 조치요청은 <선거법>과 <정보통신망법> 조항들을 같이 개정해야 한다. <선거법> 제82조의4 제3항과 <정보통신망법>의 게시물 삭제 또는 취급거부 등의 조치를 ISP에게 요청할 경우, 이중 처벌의 가능성도 있어 개정이 필요하다. 셋째, <선거법> 제82조의6(인터넷언론사 게시판 대화방 등의 실명확인)은 2015년 7월 헌법재판소가 합헌이라 결정했지만 장기적으로 정치적 표현의 자유를 제한할 소지가 강해 보완 입법이 필요하다. 마지막으로, 연구는 <선거법> 개정이 왜 어려운지를 2가지 정치적 맥락에서 재해석하고 웹 캠페인 활성화를 위한 <선거법> 개정방식으로 정치인뿐 아니라 다수의 전문가와 시민사회 등이 참여하는 '<선거법>개정 다층 거버넌스'를 제안한다.

• Asian Journal for Public Opinion Research
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• 제8권1호
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• pp.22-40
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• 2020

With social media booming, newspapers are facing an enormous challenge, and some have even had to exit the market. Likewise, their role as a main force of public opinion guidance in China has also been challenged. They have lost their vantage ground. The present study conducted a case study on one well-known Chinese online public opinion event. Through analyzing the newspapers' role played in different public opinion development stages, this study displayed how Chinese newspapers worked together and successfully guided online public opinion in that case. The newspapers' advantages in guiding public opinion and suggestions as to how newspapers can survive and guide public opinion in the new media era are put forward in the final section.

• 한국세라믹학회지
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• 제30권1호
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• pp.78-84
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• 1993

In PMN-pyrochlore phase mixtures, dielectric constant was measured as a function of the volume fraction of pyrochlore phase and considered with general effective media(GEM) equation. For the application of GEM equation to this system, the critical volume fraction(Vc) where connectivity between the perovskite PMN and pyrochlore phase changed from 0-3 to 3-3, was determined based on the each particle size ratio of two phases with microstructural observation. And then the t value was determined from modified percolation powder-law dependence ( K-Kc (V-Vc)t). In the case of applying such values of t and Vc to the GEM equation, which provided a reasonable fit to the measured dielectric constant within the experimental error range.

• 한국언론정보학보
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• 제69권
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• pp.170-194
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• 2015

신제도주의는 1970년대 이후 정치, 경제, 사회현상에 대하여 제도를 중심으로 보다 정확한 진단과 해법을 추구하는 연구경향을 통칭한다. 공동체에게 좋은 미디어란 무엇이고 어떻게 작동되어야 하는가는 미디어 제도의 설계와 제도 개선에 대한 문제적 성격을 지닌다. 미디어 제도 설계와 제도 개선 문제에 대하여 보다 높은 설명력에 대한 요구에 부응하고 해결방안을 제시할 수 있는 접근 틀이 필요하다. 이러한 배경에서 이 연구는 신제도주의 접근 틀을 통해 미디어 제도에 대한 보다 높은 설명력을 추구하고 이론화를 위한 활용방안을 탐색하였다. 주요 결과로 첫째 신제도주의 접근 틀은 미디어 정책 법제, 미디어조직 연구 분야에 보다 잘 활용될 수 있다. 둘째, 미디어정책 법제 연구와 미디어 조직연구에서 다룰 주요 연구문제와 연구방법을 제시하였다. 이 연구는 미디어 제도에 대하여 보다 체계적이고 통합적인 하나의 연구 방법으로서 신제도주의 접근법의 활용방안을 제시하였다는 점에서 의의를 갖는다. 미디어 제도를 보다 잘 설명할 수 있는 접근법으로 향후 다양한 미디어 제도 연구 분야에 활용될 수 있기를 기대한다.

• Journal of the Optical Society of Korea
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• 제18권5호
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• pp.546-550
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• 2014

To investigate the minimum near-infrared ray intensity required (quantifiable threshold value) for consistent measurements of axial length (AL) using partial coherence interferometry (PCI), we attached two polarizing lenses (PL) to two types of PCI (IOLmaster, ALscan). The near-infrared ray intensity of PCI was modified by rotating the axis of one PL at intervals of 5 degrees. The right eye of each volunteer was measured three times and the AL and signal-to-noise ratio (SNR) was recorded five times for each measurement. Reduction of light intensity was theoretically estimated using Malus' Law. AL was measured consistently with both IOLmaster and ALscan until they reached 55 degrees (1.33 % of intensity) and 60 degrees (0.77%), respectively (P = 0.343, Log-rank test). In contrast, SNR decreased as light intensity decreased. In addition, to analyze media opacities that precluded measurement of AL, we retrospectively reviewed the medical records of patients unmeasurable by PCI (ALscan) from May to November 2013. Thirty-eight of 473 eyes (8.0%) could not be measured using ALscan due to media opacities, such as severe posterior subcapsular cataract (PSC, 11 eyes), hypermature cataract (9 eyes), and vitreous hemorrhage (18 eyes). The mean grades of vitreous haze and PSC were $7.72{\pm}0.96$ and $4.45{\pm}1.04$, respectively. In conclusion, up to 0.77-1.33% of near-infrared rays decreased, and AL could be measured consistently.

• Biomaterials and Biomechanics in Bioengineering
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• 제2권2호
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• pp.111-125
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• 2015

For engineers, generating a mesh in porous media (PMs) sometimes represents a smaller computational load than generating realistic stent geometries with computer fluid dynamics (CFD). For this reason, PMs have recently become attractive to mimic flow-diverter stents (FDs), which are used to treat intracranial aneurysms. PMs function by introducing a hydraulic resistance using Darcy's law; therefore, the pressure drop may be computed by test sections parallel and perpendicular to the main flow direction. However, in previous studies, the pressure drop parallel to the flow may have depended on the width of the gap between the stent and the wall of the test section. Furthermore, the influence of parameters such as the test section geometry and the distance over which the pressure drops was not clear. Given these problems, computing the pressure drop parallel to the flow becomes extremely difficult. The aim of the present study is to resolve this lack of information for stent modeling using PM and to compute the pressure drop using several methods to estimate the influence of the relevant parameters. To determine the pressure drop as a function of distance, an FD was placed parallel and perpendicular to the flow in test sections with rectangular geometries. The inclined angle method was employed to extrapolate the flow patterns in the parallel direction. A similar approach was applied with a cylindrical geometry to estimate loss due to pipe friction. Additionally, the pressure drops were computed by using CFD. To determine if the balance of pressure drops (parallel vs perpendicular) affects flow patterns, we calculated the flow patterns for an ideal aneurysm using PMs with various ratios of parallel pressure drop to perpendicular pressure drop. The results show that pressure drop in the parallel direction depends on test section. The PM thickness and the ratio of parallel permeability to perpendicular permeability affect the flow pattern in an ideal aneurysm. Based on the permeability ratio and the flow patterns, the pressure drop in the parallel direction can be determined.