• 한국통신학회논문지
• /
• 제37권2A호
• /
• pp.83-94
• /
• 2012

TV 화이트 스페이스(TV White Space, TVWS)에서는 WRAN, WLAN과 같은 다양한 이종 통신 기기들이 공존하게 되기 때문에 TV 화이트 스페이스 주파수 대역을 공유하는 무선 장치들은 주파수 사용 면허를 가진 TV, 무선 마이크와 같은 면허사용자(Incumbent)에 대한 간섭제어 기술 이외에도 주파수를 공유하는 동종 또는 이종의 비면허 무선 네트워크에 대한 상호공존 기술이 요구된다. 본 논문에서는 WLAN 사용자에게 더 많은 대역폭을 제공할 수 있는 WRAN 스펙트럼 에티켓 기법 및 유전자 알고리즘을 사용한 WLAN 주파수 선택기법, 이렇게 두가지 상호공존 기법을 제안한다. 또한 이를 적용한 시뮬레이션 결과를 통하여 두 가지 상호공존 기법을 통해 두 이종 시스템 상호간의 간섭을 줄이고 throughput 성능을 향상시킬 수 있음을 보인다.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
• /
• pp.1149-1152
• /
• 2005

The frequency of inverters for driving multi-lamp backlights for LCD TV was synchronized to reduce noise from lamps and noise generated from PWM dimming.

• ETRI Journal
• /
• 제37권6호
• /
• pp.1077-1086
• /
• 2015

This paper presents a general-purpose design scheme of a filter bank (FB)-based radio frequency (RF) transceiver that operates across the entire ultra-high frequency (UHF) TV band from 470 MHz to 698 MHz and complies with the TV white space (TVWS) regulatory requirements. To this end, an intermediate frequency (IF) band-pass filter (BPF) with a sharp skirt characteristic is considered as a solution for handling the incoming signals from a baseband modem. Specifically, an FB-based BPF structure with four ceramic resonator filters that effectively rejects unwanted signals is proposed to extract a desired signal in the TV band. Achievable data rates of a cognitive radio system (CRS) employing the proposed FB-based RF transceiver at the application layer are investigated in both wired and wireless environments. The service coverage of the CRS network is measured according to several modulation and coding schemes (MCSs) of the CRS. The results show that the coverage of a wireless network in a nearly open area can be extended by more than 9.3 km in the TVWS. Experimental results also confirm that the proposed FB-based RF transceiver is adequate for utilization in TVWS applications.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 1998년도 추계종합학술대회 논문집
• /
• pp.1235-1238
• /
• 1998

In television stereo system, to produce the sound image for spatial impression is too difficult because of the narrow distence between two speakers. A method of widening the sound image using precedence effect was introduced but it didn't work effectively in low frequency band. In this paper, we propose a new method to produce an expanded sound image in full band of audio requency in band sound is expanded by phase shifting method and a higher frequency band sound is expanded by reflection. In simulation and experiment, the proposed system guarantees useful effect of sound image expansion in television stereo system.

• 한국항행학회논문지
• /
• 제13권1호
• /
• pp.54-61
• /
• 2009

본 논문에서는 디지털TV 방송전환시기와 이동통신사업자의 주파수 사용 허가 만료기간 등에 맞추어 700MHz, 800MHz 및 900MHz 대역 주파수에 대한 재분배계획 수립이 활발히 논의되고 있다. 이러한 주파수 재분배 정책방향은 800MHz(대역폭 10MHz) 통합지휘무선통신망 주파수에 대하여도 재분배가 거론 될 것으로 예상된다. 이러한 시점에 통합무선통신망을 구성하고 있는 주파수공용통신시스템인 TETRA시스템이 데이터통신 기능을 보강한 Release 2시스템에 대한 표준이 제시되고 있다. 이 시스템은 기존의 Release 1시스템보다 주파수대역의 소요가 최대 6배까지 증가되는 것으로 분석되고 있다. 따라서 통합지휘무선통신망에 할당된 현재의 주파수 대역으로는 이와 같이 발전된 시스템을 도입 할 수 없게 된다. 본 논문에서 디지털TV방송전환에 따른 정책동향을 분석을 토대로 700MHz대역에 대한 통합무선통신망용으로 할당에 대한 정책방향을 제시한다.

• 수산해양교육연구
• /
• 제27권2호
• /
• pp.576-588
• /
• 2015

This study analyzed the influences of elementary students' usage of smartphone, computer and TV on academic attitude. Of the subjects residing in the U city to target of 10 elementary schools from the fourth grade to sixth grade, 865 students were sampled. This research made a frequency analysis and reliability analysis of the obtained date using SPSS 21.0 program were used. Research results are as follows. First, in the smartphone, computer and TV usage status of elementary school, smartphone, computer and TV were used the high frequency with which almost every commonly used, was found to be necessary to take advantage of the time to less than one hour a day, mostly alone, it has been found that a lot of online games, videos and SNS. Second, the use of smartphone, computer and TV were showed a significant effect on all sub-variables of open, self-concept, initiative, responsibility, learning enthusiasm, future orientation, creativity, self-assessment.

• Human Ecology Research
• /
• 제53권4호
• /
• pp.341-350
• /
• 2015

This study explored the determinant variables influence of Chinese consumers' purchase intention towards products featured in Korean TV dramas vis-$\grave{a}$-vis product placement (PPL). We invited 248 Chinese adult consumers who had watched Korean TV dramas in last twelve months to participate in this survey. Data analyses were conducted by Cronbach's ${\alpha}$ reliability test, confirmatory factor analysis, t -test, analysis of variance and hierarchical multiple regression with SPSS ver. 21.0 and AMOS ver. 21.0. We chose PPL effects, product quality perceptions, and product trust as main independent variables. The empirical analysis results demonstrate that female (versus male) and frequency of (or longer time) watching dramas resulted in higher perceived consumer PPL effects, product quality, trust and purchase intention. The positive effects of the product quality and product trust on purchase intentions were confirmed. There are additional mediation effects of product quality perceptions and trust on the relationship between consumer demographic characteristics (gender), TV drama watching conditions (frequency and time) and purchase intention. This research can help Korean corporations produce effective advertising by indicating how PPL affects Chinese consumer consumption behavior. The results are useful for the Chinese government and consumer organizations to improve the domestic consumption environment by developing effective TV drama PPL policies.

• 한국컴퓨터정보학회논문지
• /
• 제20권8호
• /
• pp.7-13
• /
• 2015

Recently, there are serviced user customized advertisement of various type using smart device. Representative services are advertisement service using light of smart TV screen or audible sound of smart TV to transmit advertisement information. However, those services have to do a specific action of smart device user for advertisement information or need audible audio information of TV contents. To overcome those weakness, therefore, we propose an advertisement method using inaudible sound of speaker based on smart device. This method supports the transfer of advertising content to the smart device user with no additional action or TV audio signal required to access that content. The proposed method used two high frequencies among 18kHz ~ 22kHz of audible frequency range which smart TV can send out. And it generates those frequencies synthesized with audio of TV contents as trigger signal which can send advertisements to smart device. Next, smart device analysis the trigger signal and request advertisement contents related to the signal to server. After then, smart device can show the downloaded contents to user. Because the proposed method uses the high frequencies of sound signals via the inner speaker of the smart device, its main advantage is that it does not affect the audio signal of TV content. To evaluate the efficacy of the proposed method, we developed an application to implement it and subsequently carried out an advertisement transmission experiment. The success rate of the transmission experiment was approximately 97%. Based on this result, we believe the proposed method will be a useful technique in introducing a customized user advertising service.

• 한국콘텐츠학회논문지
• /
• 제21권9호
• /
• pp.284-298
• /
• 2021

TV media는 인지도 생성 뿐 아니라, 브랜드에 대한 인터넷 검색 행동을 유발하며, 검색 결과는 브랜드 홈페이지 혹은 E-commerce site로 연결된다. 본 연구는 TV 광고가 브랜드 관련 검색행동에 미치는 영향을 검증하기 위해 국내 TV 채널에서 방영된 TV 광고량이 국내 검색 플랫폼인 NAVER 검색량에 미치는 영향에 대해 분석하였으며, 결과는 다음과 같다. TV 광고 노출량은 한글 검색량, 영어 검색량, 총 검색량과 유의한 정적 상관관계가 있었다. 또한, TV광고 노출량의 변화는 검색량 변화에도 유의한 정적 영향력이 있었다. TV 광고를 실시한 업종별로 TV 광고량 증가에 따른 브랜드 검색 언어 증가량이 다르게 나타났고, TV 광고내용에 영어 로고가 표출된 경우 TV광고 노출량이 늘어날수록 영어검색 빈도가 한글검색빈도보다 더 빨리 상승함이 검증되었다. 따라서 국내 TV 광고량은 NAVER 검색량에 영향을 미치는 것으로 검증되었으며, TV 광고를 실시한 광고 업종과 브랜드 검색 언어는 조절효과가 있는 것으로 검증되었다. 이에 따라 TV 광고는 한국인의 모국어가 아닌 영문 브랜드 검색 행동도 활발하게 일으킬 수 있는 것으로 해석할 수 있다.

• 가정과삶의질연구
• /
• 제21권2호
• /
• pp.61-74
• /
• 2003

Recently, the number of consumers who buy various goods using the shopping channels on cable TV has increased. The objectives of this study are to examine the propensity of consumers to make an impulse purchase through cable TV, and to investigate the factors that influence consumers' impulse purchase. The following was found in this study: (1) The propensity of consumers to make impulse purchases on cable TV is somewhat low, Among sub-areas of impulse purchase, the propensity to make impulse purchase by suggestion is the highest. (2) Among the variables that affect consumers' impulse purchase on cable TV, the most influential variable is the psychological factor, followed by the frequency of shopping on cable TV, positive testimony from consumers who have used the product, and the amount of time spent in watching shopping channels on cable TV, in that order.