• 한국멀티미디어학회논문지
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• 제23권12호
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• pp.1576-1585
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• 2020

The purpose of this study is to design and apply YouTube ecosystem using digital curation to improve the interaction of untact class. The untact digital instructional model for building the YouTube ecosystem is composed of four modules: domain, tutor, student, and interface, and the role of each module is described. As an application example, the team project "Development and Operation of Instructional Assistant YouTube" is performed in the Introduction to Media Software class. The learning experience is described in terms of professor, peer tutors, and learners, and learning outcomes are presented through surveys.

• 한국산업정보학회논문지
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• 제26권5호
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• pp.95-111
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• 2021

본 연구는 장기적인 관점에서 미디어서비스에 대한 중독이 어떻게 연구되었는지 흐름을 살펴보고, 향후 중독 연구의 기반이 될 수 있는 변인을 확인하였다. 연구자들은 특히 청소년의 미디어 서비스의 중독에 주목하였으며, 미디어 환경변화에 따라 다양한 요인이 복합적으로 작용하는 것을 확인하였다. 중독 변인은 크게 청소년기 속성, 개인 속성, 매체 속성, 미디어 의존 속성 등 4가지 속성으로 취합되었다. 속성에 귀속되는 중독 변인은 주요 미디어의 영향을 받았으며 4기로 나뉘었다. 연구대상 기간 동안 변인의 빈도는 개인 속성과 관련된 변인이 가장 많았고, 매체 속성, 청소년기 속성, 미디어 의존 속성 순으로 나타났다. 또한 개인 속성 변인은 대상관계 요인에서 점차 개인의 심리적 요인으로 옮겨갔다. 매체 속성의 변인은 새로운 매체 도입과 확산으로 청소년의 중독 현상 연구가 증가하였다. 청소년기 속성과 미디어 의존 속성의 변인에 대하여 청소년의 미디어 이용 동기를 관찰하거나 중독 관련성을 띤 연구가 미약했으며 2020년부터 발표된 논문은 없었다. 미디어서비스 중독 연구는 산업적 측면에서 중요한 가치가 있음에도 불구하고, 그간 사회적 측면이 강조되는 면이 있었으나, 본 연구의 연구결과를 바탕으로 향후 미디어서비스 개선과 이용자의 건전한 몰입의 측면에서 산업적으로 다양하고 구체적인 개별 미디어와 사회·문화적 차이에 따라 비교되는 중독 변인에 대한 후속연구가 기대된다.

• Environmental Analysis Health and Toxicology
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• 제13권3_4호
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• pp.133-142
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• 1998

Effects of phosphorous (P) and methylglyoxal (MG) on the cell number, dry weight, chlorophyll content, photosynthetic and respiratory rate, phosphate uptake and protein content of green algae (Scenedesrnus obliquus) were studied. The algal cell number from the medium treated with 0.5-1.0 mM of MG at 1/2 P or 1/4 P concentration was significantly lower than those of algae treated :with full strength of phosphrous in medium. The inhibitory effect of MG on algal cell division was enhenced at low concentration of phosphorous in medium. At the beginning of logrithmic phase of algal growth, the mean dry weight of algae from the medium without MG-treatment in 1/2 P media was significantly higher than that of algae treated with MG. After logrithmic phase of growth cycle, the mean dry weight of algae from the medium with 1.0 mM of MG-treatment in 1/4 P media was significantly lower than that of algae treated with or without MG. At logrithmic phase of algal growth, there were significant differences in the chlorophyll content among all groups of tested algae with various concentrations of P and MG. At 15 days after inoculation, the mean chlorophyll content per algal cell from the media without MG-treatment in 1/2P was significantly higher than that of other cells from MG-treated media. The adverse effect of MG at concentration of 0.5-1.0mM in 1/2 and 1/4 P media on photosynthetic rate was observed. The mean photosynthetic rate of algal cell without P and MG treatment at 15 days after inoculation was significantly higher than that of MGtreated algae. After logarithmic phase, the algal cell treated with 0.5mM of MG with full strength of phosphorous showed significantly high respiratory rate than that of other cell groups. There were significant differences in mean phosphate uptake rate among all groups of Scenedesmus obliquus at logarithmic phase. At 12 days after inoculation, phosphate uptake rate per each algal cell from the basic media without MG and P treatment was rapidly reduced which shows early introduction to stationary phase.

• 한국음향학회지
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• 제24권7호
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• pp.365-370
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• 2005

본 논문은 Csound 프로그래밍 언어에 대한 발전된 학술 연구 혹은 독창적인 학술 아이디어를 탐구하기에 앞서, 현재 한국에서는 학술적 연구나 소개가 전혀 이루어지지 않은 Csound 음악 프로그래밍 언어를 누구도 쉽게 접근할 수 있도록 체계화된 이론을 정립하고 보급하기 위해 제안한 것이다. Csound는 세계적인 컴퓨터 음악음향 제작 프로그래밍 언어이며, 세계적으로 유명한 사운드 디자이너들이 이용하는 전문적인 텍스트 기반 소프트웨어 신디사이저로, 1985년 M.I.T. Media Lab의 Barry Vercoe에 의해 개발되었다. 본 본문은 서양 전통음악의 역사적인 관점에서 음악과 자연의 소리 혹은 특정 매체로부터 발생되는 소리와의 결합시기를 전자음악과 음악음향 제작의 출발점으로 제시하였다. 그리고 기초적인 Csound의 작동원리를 서술하고. 이를 기초로 Csound를 이용한 음악 프로그래밍의 적용예를 제시하였으며, 결론에서는 본 논문의 연구 목표와 앞으로의 연구 과제를 서술하였다.

• 한국컴퓨터그래픽스학회논문지
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• 제10권3호
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• pp.52-60
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• 2004

This paper presents a physically based technique for simulating complex multiphase fluids. This work is motivated by the "stable fluids" method developed by Stam to handle gaseous fluids. We extend this technique to water, which calls for the development of methods for modeling multiphase fluids and suppressing dissipation. We construct a multiphase fluid formulation by combining the Navier-Stokes equations with the level set method. By adopting constrained interpolation profile (CIP)-based advection, we reduce the numerical dissipation and diffusion significantly. We further reduce the dissipation by converting potentially dissipative cells into droplets or bubbles that undergo Lagrangian motion. Due to the multiphase formulation, the proposed method properly simulates the interaction of water with surrounding air, instead of simulating water in a void space. Moreover. the introduction of the non-dissipative technique means that, in contrast 10 previous methods, the simulated water does not unnecessarily lose mass and its motion is not damped to an unphysical extent. Experiments showed that the proposed method is stable and runs fast. It is demonstrated that two-dimensional simulation runs in real-time.

• Clinical and Experimental Pediatrics
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• 제49권3호
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• pp.235-241
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• 2006

Streptococus pneumoniae is an important cause of invasive infections as well as non-invasive infections such as acute otitis media and sinusitis both in children and adults. Resistance of S. pneumoniae to multiple antimicrobials is increasing and poses therapeutic challenges, and prevention became more important. 23-valent polysaccharide vaccine has been used for the last several decades, but is not effective in children <2 years of age, the highest risk group of invasive diseases. Recently, a 7-valent pneumococcal protein conjugate vaccine(PCV) which is effective in infants and young children has been developed. The efficacy of PCVs against invasive pneumococcal disease and pneumonia is well established and is documented in several well-conducted studies. However, the effect of PCVs on otitis media is less obvious and more complex. PCVs clearly reduce diseases caused by vaccine-type(VT) pneumococci, but replacement of VT serotypes by non-VT serotypes in nasopharyngeal carriage of S. pneumoniae is responsible for the increase in acute otitis media caused by non-VT serotypes. Three years after introduction of PCV in the US, some increase of invasive infections with serotype 19A possibly due to serotype switching within certain vaccine type strains has been noted. Since most antibiotic-resistance in S. pneumoniae is confined to VT serotypes, vaccine use also reduces antibiotic resistance. With development of PCV, there was a great advance in the prevention of pneumococcal diseases, but replacement with potential virulent organisms and development of antibiotic resistance in non-VT pneumococci is a possibility that needs careful monitoring.

• 한국컴퓨터그래픽스학회논문지
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• 제10권4호
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• pp.13-21
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• 2004

This paper presents a physically based technique for simulating complex multiphase fluids. This work is motivated by the "stable fluids" method developed by Stam to handle gaseous fluids. We extend this technique to water, which calls for the development of methods for modeling multiphase fluids and suppressing dissipation. We construct a multiphase fluid formulation by combining the Navier-Stokes equations with the level set method. By adopting constrained interpolation profile (CIP)-based advection, we reduce the numerical dissipation and diffusion significantly. We further reduce the dissipation by converting potential1y dissipative cel1s into droplets or bubbles that undergo Lagrangian motion. Due to the multiphase formulation, the proposed method properly simulates the interaction of water with surrounding air, instead of simulating water in a void space. Moreover, the introduction of the non-dissipative technique means that, in contrast to previous methods, the simulated water does not unnecessarily lose mass and its motion is not damped to an unphysical extent. Experiments showed that the proposed method is stable and runs fast. It is demonstrated that two-dimensional simulation runs in real-time.

• 한국인쇄학회지
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• 제28권2호
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• pp.31-44
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• 2010

Ever since the introduction of offset lithography, an operator have looked for ways to improve the process by reducing need for dampening solution. Lithography like off-set printing is processed using the repellent properties between water and oil, so all inks for lithography printing must work with dampening solution. The dampening solution may cause the emulsification of ink by the printing pressure in the printing nip. Emulsified ink changed viscosity, tack and causes problems such as bad transfer, uniform density and printed mottle. For a high quality web printing, we studied the effect of emulsified heat-set web inks on the printability, such as amount of ink transfer, printed density and uniformity. For this study, we were carried out by using IGT printability tester C1. For determination of ink properties using the spread meter and Thwing Albert Ink-o-meter, and using the densitometer and image analysis for printed quality determination. The experimental results of this study, we look forward to can be used as the basis for improve of the web print quality.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.335-338
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• 2010

2000년 통합방송법의 통과는 시민의 방송참여와 직접 관련이 있는 시청자 권리 보장 강화 조항과 액세스 방송도입 관련 조항이 포함되었다. 대표적 지상파 공영방송에 액세스 프로그램 시간대를 보장하였고 뉴미디어 방송이라 할 수 있는 케이블 TV와 위성 방송의 경우에는 시청자가 원할 경우 시청자 직접 제작 프로그램을 편성하도록 하고 있다. 본 논문에서는 국내 퍼블릭 액세스 프로그램들을 살펴보고 채널기반과 심의 방법을 통해 시청자 참여방송인 퍼블릭 액세스가 시청자를 위한 방송으로 거듭나기 위한 개선방향을 제시했다.

• 한국인터넷방송통신학회논문지
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• 제22권4호
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• pp.141-148
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• 2022

OTT 등 신규 서비스가 등장하고 미디어 산업의 가치사슬이 복잡한 지형을 형성하게 되면서 공정경쟁과 이용자 보호, 내용심의 등 다양한 문제들이 발생하고 있다. 그러나 네트워크의 물리적 특성과 기술적 요소로 사업자를 구분하는 기존법으로 OTT를 도입하는 문제는 과다한 규제와 산업 활성화 저해라는 측면에서 비판받고 있으며, 새로운 규제체계로의 도입은 플랫폼의 사회적 영향력에 대한 논란과 이해관계자와의 충돌로 장기적인 지연을 거듭하고 있다. 본 연구는 전문가들이 인식하는 기존법 내지 새로운 규제체계 하에서 OTT 도입을 위한 규제 근거와 기준에 대한 의견을 청취하고 이에 대한 타당성을 분석했다. 이와 같은 분석은 향후 OTT 도입 방식에 유의미한 시사점을 제공할 것으로 판단된다.