• 한국통신학회논문지
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• 제41권12호
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• pp.1715-1720
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• 2016

다가올 5세대 이동통신 시스템에서 전력효율과 스펙트럼 효율을 향상시키기 위한 여러 가지 기술들이 제안되고 있다. 4세대 이동통신 시스템과 마찬가지로 5세대 이동통신 또한 다중반송파 기반의 변조기술이 많이 연구 되고 있다. 본 논문에서는 이러한 기술 중에 DFT-s-OFDM(Discrete Fourier Transform-spread-orthogonal frequency division multiplexing)기반의 Zero-tail DFT-s-OFDM과 UW(Unique Word)-DFT-s-OFDM 시스템의 구조를 기존 시스템과 분석한다. 두 시스템은 기존 시스템에서 각각 zero와 UW를 심볼에 추가하고 CP(Cyclic Prefix)를 제거한다. 시스템의 특성을 시뮬레이션을 통해 확인해본 결과, Zero-tail DFT-s-OFDM과 UW-DFT-s-OFDM 시스템이 DFT-s-OFDM 시스템에 비해서 CP길이 만큼 시간 자원을 더 적게 소모하며 OOB(Out of Band) 전력이 약 11dB 정도 감소하는 것을 확인할 수 있다. 이러한 결과를 살펴봤을 때, Zero-tail DFT-s-OFDM과 UW-DFT-s-OFDM 시스템은 DFT-s-OFDM 시스템에 비해서 더 효과적임을 확인 할 수 있다.

• Asia Marketing Journal
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• 제21권2호
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• pp.73-98
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• 2019

As information and communication technology continue its remarkable development, the exchange of information online becomes as prevalent and frequent as face-to-face communication in daily life. Therefore, the management and application of WOM (word of mouth) practices will become more important than ever to companies. Currently, there are various types of communication channels for online WOM, and each channel has its own unique traits. Most of the previous research studies online WOM by examining the information inside a single communication channel, but this research chooses two different communication channels and analyzes the effects of online WOM with each channel's unique characteristics. More specifically, this research focuses on the expectation that the effects of information from Twitter and blogs on product sales may differ because Twitter and blogs, two different communication channels for online WOM, have their own unique traits. Our particular aim is to perform an in-depth examination on the effects of communication channel's volume and valence on product sales, two important attributes of online WOM. Furthermore, while most of the empirical research focuses on online WOM and analyzes its effect on markets of temporary experience goods, such as movies and books, this research highlights focuses on the automobile market, a durable goods market. The results of our analysis are as follows: First, regarding blogs, a positive valence significantly and positively affects the sales of products, and this result indicates that consumers are influenced more by the emotional aspect of a product presented in a post than by the number of blog posts. Second, regarding Twitter, the volume of online WOM significantly and positively affects sales, an indication that as the number of posts increase, the sales increase. Through this research, we suggest that even those firms that sell durable goods can increase sales through the management and application of online WOM. Moreover, according to the characteristics of communication channels, the effects of online WOM on sales differ. As a practical implication of this research, we suggest that companies can and should create marketing strategies appropriate to their targeted communication channels.

• 방송공학회논문지
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• 제16권2호
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• pp.207-215
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• 2011

SC-FDE(Single Carrier with Frequency Domain Equalizer) 전송 방식에서 채널의 다중경로를 통과한 신호들은 채널 지연 확산과 노이즈 영향으로 심하게 왜곡이 되거나 ISI(Inter-Symbol Interference)가 발생된다. 기존 UW(Unique-Word) 기반 SC-FDE 전송 방식중 하나인 반복적 채널 추정은 채널 길이를 안다고 가정하여 추정한 CIR(Channel Impulse Response)의 채널 길이 밖에 있는 노이즈 성분을 시간 영역에서 스무딩을 함으로써 노이즈 성분을 제거한다. 또한, 주파수 영역에서 채널 추정에 사용하는 UW를 복원하여 잔재하는 ISI 성분을 제거함으로써 채널 추정 성능을 향상시킨다. 본 논문은 채널 길이 안으로 있는 노이즈 성분 억압을 통한 채널 추정기법을 제안한다. 노이즈 성분을 억압하기 위해 시간 영역에서 추정된 CIR로 채널 길이 밖에 있는 노이즈 성분을 이용하여 노이즈의 표준편차를 추정하고 본래 신호 샘플에 영향이 안가도록 노이즈 표준편차 이득의 기준을 만든다. 추정된 노이즈의 표준편차와 이득을 이용하여 CIR 샘플들이 기준값 이하 일 때 채널 길이 안에 있는 노이즈 성분을 스무딩을 한다. 시뮬레이션 결과는 채널의 MSE(Mean Square Error)와 BER(Bit Error Rate)을 통하여 제안된 기법을 적용할 때 성능 개선이 나타남을 확인 할 수 있었다.

• 한국정보시스템학회지:정보시스템연구
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• 제30권2호
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• pp.57-78
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• 2021

Purpose In this study, first, we try to make embedding results that reflect the characteristics of both professional and general documents. In addition, when disparate documents are put together as learning materials for natural language processing, we try to propose a method that can measure the degree of reflection of the characteristics of individual domains in a quantitative way. Approach For this study, the Korean Supreme Court Precedent documents and Korean Wikipedia are selected as specialized documents and general documents respectively. After extracting the most similar word pairs and similarities of unique words observed only in the specialized documents, we observed how those values were changed in the process of embedding with general documents. Findings According to the measurement methods proposed in this study, it was confirmed that the degree of specificity of specialized documents was relaxed in the process of combining with general documents, and that the degree of dissolution could have a positive correlation with the size of general documents.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2010년도 추계학술대회
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• pp.125-126
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• 2010

채널의 다중경로를 통과한 신호들은 지연확산 영향으로 심하게 왜곡이 되거나 Inter-Symbol Interference(ISI)가 발생하므로 왜곡된 채널을 추정하여 보상해야 한다. 기존 iterative 채널 추정 방식에서는 채널 시간 지연 길이 밖으로 zero padding함으로 노이즈 성분을 제거하는 알고리즘이다. 반면에 본 논문은 채널 시간 지연 길이 안으로 있는 노이즈 성분까지 노이즈 제거 문턱 값 추정(noise elimination threshold estimation: NETE) 알고리즘을 사용하여 노이즈를 효과적으로 제거한다. 시뮬레이션 결과는 채널의 mean square error(MSE)를 통하여 제안된 기법을 적용할 경우 채널 추정 성능 개선이 나타남을 확인할 수 있었다.

• 한국의류산업학회지
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• 제9권4호
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• pp.431-440
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• 2007

The study of the awareness on DM, the degree of satisfaction, and intention of word-of-mouth has found that when the confidence factor is stressed, intention of word-of-mouth is seen to rise, and when the perception factor is placed emphasis on, intention of word-of-mouth is also seen to be on the rise. The 790 questionnaires collected were analyzed by frequency, factor analysis, confidence degree, and regression analysis. This means that the higher the degree of satisfaction by means of the recognition, attention, trust of DM advertisement, the relationship reenforcement of DM advertisement and transmission of information is, the higher intention of word-of-mouth is. Beauty art business is characteristic of visits being connected with sales. The awareness has an effect on the degree satisfaction, and it affects intention of word-of-mouth. Therefore, it is thought that Beauty art business requires systematic, analytic and unique DM advertisement.

• 한국정보과학회 언어공학연구회:학술대회논문집(한글 및 한국어 정보처리)
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• 한국정보과학회언어공학연구회 2005년도 제17회 한글 및 한국어 정보처리 학술대회
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• pp.139-144
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• 2005

When a Japanese learner in Korea tries to find Japanese dictionary, he must know the pronunciation of the target word. But it's not easy to know the pronunciation of target word from Japanese sentence. Because most of general Japanese sentence shows only HanJa(Chinese character) instead of Kana(Japanese alphabet). If the Japanese learner knows the Korean traditional pronunciation of the target word, he can input the word to electronic Japanese dictionary with the Korean pronunciation. For this solution, the dictionary service provider must convert the Japanese word to Korean pronunciation, in advance. After setting of the conversions as a additional searching process, we can find the target word through Korean pronunciation of the Japanese HanJa, This process is possible for the three reasons below, 1. Korean, Japanese and Chinese are using the nearly same HanJa. The difference is small. 2. Most Japanese learner in Korea, knows the Korean pronunciation of the HanJa. 3. The Korean pronunciation of the HanJa is nearly unique, a HanJa has a Korean pronunciation, generally.

• 산경연구논집
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• 제15권9호
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• pp.1-9
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• 2024

Purpose: This study examines the impact of YouTube mukbang content characteristics on viewer satisfaction and word-of-mouth behavior. Drawing from theories in media psychology, consumer behavior, and communication studies, we investigate five key content characteristics: credibility, entertainment value, informativeness, visual appeal, and auditory quality. Research design, data and methodology: Using structural equation modeling with data from 206 mukbang viewers, we test hypothesized relationships between these characteristics, viewer satisfaction, and word-of-mouth behavior. Results: Research reveal that credibility and informativeness significantly and positively influence viewer satisfaction, while entertainment value, visual appeal, and auditory quality show no significant effect. Viewer satisfaction positively impacts word-of-mouth behavior. These findings challenge conventional assumptions about video content consumption and highlight the unique nature of mukbang viewing. Conclusions: The study contributes to digital content consumption literature by providing empirical evidence of factors influencing viewer engagement in the mukbang context. It offers practical insights for content creators, marketers, and platform developers, emphasizing the importance of informative and credible content in driving viewer satisfaction and promoting positive word-of-mouth. By extending established media theories to this emerging form of digital entertainment, our research paves the way for future studies. The study's limitations, including its cross-sectional nature and specific cultural context, suggest directions for future research.

• 한국정보전자통신기술학회논문지
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• 제4권4호
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• pp.286-294
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• 2011

본 논문은 ITU-T 권고안 J-38 부록 B에 명시된 전송방식의 분석 및 시뮬레이션을 토대로 성능을 분석 하였으며 FPGA 구현시 야기되는 문제점을 나타내고, 해결방안을 제시하였다. 구현상의 문제점으로는 크게 두가지로 분류되는데, 첫째로 다양한 부호화 방식과 변조방식 그리고 심볼 단위 및 비트 단위의 처리로 인해 많은 클럭수를 요구하는데 본 논문에서는 read/write 메모리를 이용하여 필요한 클럭수를 줄였다. 둘째로는 펑쳐링 부호화된 TCM 복호기에 펑처링 패턴에 정확한 동기를 얻지 못하면 프레임 동기 심볼인 UW(Unique sync-Word)를 획득하지 못한다. 따라서 본 논문에서는 펑처링 패턴과 UW 심볼의 동기를 맞추는 알고리즘을 제시하였다. 이러한 알고리즘 분석 및 구현상의 문제점 해결을 토대로 본 논문에서는 ITU-T J38 annex B의 하향 스트림 채널 부호화 시스템을 VHDL 언어를 사용하여 FPGA 칩에 직접 구현하였다.

• 대한음성학회:학술대회논문집
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• 대한음성학회 2007년도 한국음성과학회 공동학술대회 발표논문집
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• pp.183-186
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• 2007

This study analyzes Korean high school students' pronunciation errors in word-initial onglides in English. For this study, 24 Korean high school students read 34 English words including glide-vowel sequences in word-initial positions and vowel-initial words in a frame sentence. The results showed 2 different error types: glide deletion and vowel distortion. After the analysis of the first recording, the subjects were taught how to pronounce glide-vowel sequences properly in a 60-minute class. Comparison of the analyses of the first and second recordings showed that the subjects improved on the pronunciation of glide-vowel sequences. After the training, the pronunciation errors of diphthongs unique to English, [$j_I$], decreased substantially. However, most subjects still had difficulties in pronouncing [$w{\mho}$], [wu], and [wo]. There was no significant correlation between English course grade and error reduction.