• Convergence Security Journal
• /
• v.18 no.3
• /
• pp.61-68
• /
• 2018

As the digital broadcasting era settled in, the TV, which was only used to watch broadcast programs, developed as a medium for operating various data services. This means that an environment, in which the viewers' TV usage behavior can be changed from a passive attitude to an attitude of actively consuming the media, has been established. Since the advertising market is an industry that is heavily influenced by changes in the media, these changes causes changes in the form of advertising and the advertising consumption behavior of viewers. In this environment, the broadcasting industry needs to think about the new growth strategy that links the possibility of data service with the advertisement market. In this study, we designed a data service that provides supplementary information of an ID advertisement, which has the weakness of short exposure time and shortage of information expression space. Specifically, we have designed the usage scenario and user interface of the data service and developed a method, based on the international digital broadcasting standard DV B, that provides the supplementary information defined by the type of ID advertisement to the data service.

• Convergence Security Journal
• /
• v.22 no.4
• /
• pp.119-127
• /
• 2022

A movie information program has a positive effect on the viewer's intention to watch the movie by providing an indirect experience of the movie based on trust. In order to increase the effectiveness of a movie information program, a data service that provides the additional information on the movies introduced in a movie information program has been studied. However, since the study limited the data service to one movie information program, it was difficult to apply it to the actual environment of general cable broadcasting companies or satellite broadcasting companies that transmit multiple movie information programs. Therefore, this study expanded the existing research limited to one movie information program to provide additional information of several movie information programs. This study is meaningful in that it suggests a data service that can be operated in the realistic environment of a broadcaster that actually transmits several movie information programs.

• Analytical Science and Technology
• /
• v.22 no.1
• /
• pp.92-100
• /
• 2009

Azacrown resins were synthesized by mixing 1-aza-12-crown-4 macrocyclic ligand into styrene (2th petroleum in 4th class hazardous materials) divinylbenzene (DVB) copolymer with crosslinkage of 1%, 2%, 5% and 10% by substitution reaction. The synthesis of these resins was confirmed by content of chlorine, element analysis, thermogravimetric analysis (TGA), surface area (BET), and IR-spectroscopy. The effects of pH, time, crosslinkage of resins and dielectric constant of solvent on adsorption of metal ions by resin adsorbent were investigated. Metal ions showed a great adsorption over pH 3 and adsorption equilibrium of metal ions was about two hours. In addition, adsorptive selectivity of metals on the resin in ethanol solvent was increased in the order of ${UO_2}^{2+}$ > $Ca^{2+}$ > $Sm^{3+}$ ion and adsorption of uranium ion was decreased with increase of crosslinkage such as 1%, 2%, 5% and 10% and was inversely proportional to the order of dielectric constant of solvents.

• Analytical Science and Technology
• /
• v.21 no.2
• /
• pp.109-116
• /
• 2008

Resins were synthesized by mixing 1-aza-18-crown-6 macrocyclic ligand into styrene(dangerous matter) divinylbenzene(DVB) copolymer with crosslink of 1%, 2%, 6% and 12% by substitution reaction. The synthesis of these resins was confirmed by content of chlorine, elemental analysis, thermogravimetric analysis, electron microscopy, and IR. The effects of pH, time, crosslink of resins and dielectric constant of solvent on adsorption of uranium ion by resin adsorbent were investigated. Uranium ion showed a great adsorption above pH 3 and adsorption equilibrium of metal ions was established in about two hours. In addition, adsorptive selectivity of resin in ethanol solvent was $UO{_2}^{2+}$ > $Zn^{2+}$ > $Lu^{3+}$ ion and adsorption of uranium ion increased with the increase of the degree of crosslinking (1%~12%) and was inversely in proportional to the order of dielectric constant of solvents.

• Journal of Photoscience
• /
• v.9 no.2
• /
• pp.217-220
• /
• 2002

Ultraviolet B (UVB) radiation may activate or deteriorate cultured human epidermal melanocytes, depending on the doses and culture conditions. In this study, we examined whether apoptosis of melanocytes can be induced by physiologic doses of UVB irradiation. PI staining for DNA condensation and flow cytometric analyses demonstrated the apoptotic cell death of melanocytes after UVB irradiation. The level of p53 and Bax revealed a dose-dependent increase with increasing dose of UVB, but the level of Bcl-2 remained unchanged. Confocal microscopic examination showed that Bax moved trom a diffuse to a punctate distribution after UVB irradiation. However, there were no changes in the pattern of Bcl-2. We next examined the downstream targets of apoptosis. Our results showed that a precursor form of caspase-3 disappeared with increasing doses of UVB. We also observed cleavage of poly(ADP-ribose) polymerase (PARP) after UVB irradiation. In addition, UVB irradiation resulted in a remarkable activation of c-Jun N-terminal kinase (JNK). These results indicate that UVB may induce apoptosis via JNK activation in human melanocytes.

• ETRI Journal
• /
• v.27 no.5
• /
• pp.639-642
• /
• 2005

This paper proposes two kinds of complexity-reduced algorithms for a low density parity check (LDPC) decoder. First, sequential decoding using a partial group is proposed. It has the same hardware complexity and requires a fewer number of iterations with little performance loss. The amount of performance loss can be determined by the designer, based on a tradeoff with the desired reduction in complexity. Second, an early detection method for reducing the computational complexity is proposed. Using a confidence criterion, some bit nodes and check node edges are detected early on during decoding. Once the edges are detected, no further iteration is required; thus early detection reduces the computational complexity.

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.06d
• /
• pp.262-264
• /
• 2006

최근 wired 및 wireless 환경에서 멀티미디어 데이터 전송에 대한 수요가 증가하고 있다. 또한 네트워크의 대역폭 효율성을 위해 멀티캐스트 전송이 요구되었고, 신뢰적인 멀티캐스트 전송 프로토콜인 RMT 프로토콜이 등장하게 되었다. FLUTE는 ALC 기반의 어플리케이션으로 LAN 환경 및 3GPP 및 DVB-H에서 멀티캐스트 콘텐츠 전송을 위해 사용하고 있다. FLUTE는 동일한 멀티캐스트 세션에서 FDT 인스턴스를 전송한 후에 콘텐츠를 전송한다. 그러나 FDT 인스턴스를 수신하지 못하면 콘텐츠를 수신할 수 없기 때문에, FDT 인스턴스 전송 이전에 멀티캐스트 세션에 Join해야 하는 문제가 발생한다. 본 논문에서는 이러한 문제를 해결하는 FLUTE을 이용한 멀티캐스트 콘텐츠 전송에서 Late-Join과 Late-Join 시 파일 복구 방안을 제안하였다.

• Proceedings of the Korean Information Science Society Conference
• /
• 1998.10a
• /
• pp.577-579
• /
• 1998

지상파, 케이블, 위성 등의 기존 방송망을 이용하여, 사용자의 부합하는 데이터를 전송하는 데이터 방송 기법에 대한 연구와 표준화 작업이 활발하게 진행 중이다. 우리나라의 경우, 무궁화 위성을 이용한 부가 데이터 방송을 구현하고자 연구중이다. 데이터 방송시 데이터 전송 기법에는 데이터 스트리인(data streaming). 데이터 파이핑(data piping),데이터 캐루셀(data carousel)등이 제안되고 있다. 본 논문에서는 표준화 단체인 DVB에서 정의하고 있는 데이터 전송 기법에 대한 소개와, 함께, 데이터 캐루셀을 이용한 데이터 방송 구현에 필요한 소프트웨어 설계와 실제 구현에 관한 내용을 담고 있다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.7 no.1
• /
• pp.42-49
• /
• 2003

OFDM should be used for the fourth generation communication for high speed communication. Because of high spectral efficiency and high tolerance to fading channel, OFDM is applied to many high speed wire and wireless communication such as DAB (Digital Audio Broadcast), DVB(Digital Video Broadcast), IMT 2000 etc. Inter-modulation, however, is derived from PAR(Peak to Average Power Ratio) of OFDM signals. The paper describes PTS(Partial Transmit Sequence) and SLM(Select Mapping) of an existing methods which can reduce PAR. And then this papers proposed the new method that is called "Combine method". The method proposed in this paper is to combine PTS and SLM. As a result of the simulation, Combine PAR method is better than the existing methods.

• Bulletin of the Korean Chemical Society
• /
• v.34 no.6
• /
• pp.1703-1707
• /
• 2013

A fast and simple sampling and sample preparation device, (NTD) has been developed and applied to sample and analyze volatile components from ground coffee beans. Coffee fragrances and other volatile organic compounds (VOCs) were sampled by the NTD and then analyzed by gas chromatograph-mass spectrometry (GC/MS). Divinylbenzene (DVB) particles (80/100 mesh size) were the sorbent bed of the NTD. More than 150 volatile components were first identified based on the database of the mass library and then finally 30 fragrances including caffeine were further confirmed by comparing experimental retention indices (i.e. Kovat index) with literature retention indices. Total sampling time was 10 minutes and no extra solvent extraction and/or reconstitution step need. Straight n-alkanes (C6-C20) were used as retention index probes for the calculation of experimental retention indices. In addition, this report suggests that an empty needle can be an alternative platform for analyzing polymers by pyrolysis-GC/MS.