• 한국구조물진단유지관리공학회 논문집
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• 제3권4호
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• pp.129-137
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• 1999

Assessment of structural damage is a complex subject imbued with uncertainty and vagueness. This complexity arises from the use of subjective opinion and imprecise numerical data. Recently several active researches have been performed using new methods such as neural network approach or on-line damage detection. In this paper, Damage assessment (diagnosis) of the concrete bridges is studied by a new approach utilizing a neural fuzzy system that combined a neural network and a fuzzy logic. By applying this system to actual in-service bridges, it has been verified that the neural fuzzy method is effective for the bridge diagnosis.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2002년도 추계공동학술대회
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• pp.433-439
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• 2002

In this paper, we implemented technology assessment on the public R＆D activities in IT field in order to select the promising technologies, so called "star technology," making for national industry development. Technology assessment frame in this study included qualitative factors. IT technologies are classified five sector - network, wireless/broadcasting, SW/application/computer/terminal equipment, semiconductor/component. Expert opinion interviews on each field are carried out. Assessment factors consist of technology usefulness and technology competitiveness. In the final analysis, 23 technology items selected as a promising technologies and the results can be used public R＆D planning and If industry policy.

• 한국통신학회논문지
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• 제16권6호
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• pp.509-516
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• 1991

In this paper, we propose on objective evaluation model of telephone transmission qulity in order to estimate a satisfaction score regarding speech quality in a relephone network. As the degradantion factors of telephone transmission quality, this model takes into account transmission loss, noise, distortion, talker echo and sidetone. A performance index[PI] is introduced for five psychological factors affecting telephone speech qualty, and a Mean Opinion Score(MOS) is estimated from the sum of all Pis. The simulation results indicate theat the MOS obtained from the objective evaluation model is in good agreement with that of subjective evaluation.

• 한국사회복지학
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• 제62권2호
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• pp.279-306
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• 2010

본 연구는 정책네트워크이론을 적용하여 한국과 일본의 노인장기요양(개호)보험제도의 정책결정과정을 상호 비교, 분석하고 우리나라에의 정책적 이론적 시사점을 도출하고자 하였다. 연구결과로는, 한국과 일본 모두 노인요양(개호)문제에 대한 정책의제형성은 정부 주도로 이루어지고 정책과정단계별 특성에 따라 정책참여자의 범위가 확대되었으나, 두 나라간 노인요양문제에 대한 정책의제형성 배경에는 차이가 있음을 알 수 있다. 그리고 두 나라 모두 정책의제형성 초기단계부터 정책참여자간의 상호 작용은 비교적 협력적이었으나, 제도골격이 국민들에게 공표되면서 급격히 갈등관계 내지 비판적으로 변화해 갔으며, 정책과정단계별 특성에 따라 주도적 참여자들의 역할이 두드러졌고, 연계형태도 비슷한 모습을 보여주고 있다. 또한 정책과정별로 정책참여자의 범위와 정책산출에의 정책참여자들의 의견 반영 정도가 다르지만, 한국, 일본 모두 정부주도로 노인요양문제에 대한 정책 추진결과로 정책의제형성기부터 국회심의결정기까지 매우 유사한 정책네트워크모형을 보여주고 있다. 정책참여자의 범위 뿐만 아니라 개방적인 상호작용시스템 구축의 중요성, 개호보험제도 정책결정과정의 많은 한계점, 과도한 정부주도 정책네트워크로 인한 정책산출에 정부의지가 너무 많이 반영되는 단점 등이 본 연구의 시사점으로 볼 수 있다.

• Asian Journal for Public Opinion Research
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• 제1권3호
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• pp.153-202
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• 2014

Aside from political leaders' popularity rates and the stock exchange index of business firms, ordinary people are highly interested in aspects of daily life, such as housing, income, health, family, food, human relations and work. Cross-national opinion polls on daily-life satisfaction were carried out in Japan, South Korea, Thailand, Hong Kong, Macao, the Philippines, India, Myanmar, Taiwan, China, Malaysia and Pakistan in the fall of 2013 and winter 2014. The percent difference index (PDI) is formulated as the sum of two positive responses (satisfied and somewhat satisfied) minus the sum of two negative responses (dissatisfied and somewhat dissatisfied). Percent difference indices are given according to society and daily-life aspects. For our analysis to go beneath national average and to go beyond national borders, two lines of analysis are carried out. First, the distance between the level of satisfaction of the top and bottom quartiles is given for each society and according to each of the daily-life aspects. Second, the regional sum of satisfaction of the top quartiles and bottom quartiles are shown crossed by daily-life aspects. In this article we confine ourselves to preliminary comparative description and analysis. More solid and deep comparisons will be carried out by local polling leaders of 12 Asian societies in the succeeding issue of the Asian Journal of Public Opinion Research. Nevertheless, two key threads stand out from this preliminary comparisons. First, social relations (family and human relations) stand out as most satisfied aspects of life in most of twelve societies. Second, the need to go beneath national averages and beyond national borders in analyzing cross-national surveys is confirmed. The comparability and validity of cross-national surveys with varying sampling method and survey mode are briefly discussed toward the end of the article.

• 응용통계연구
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• 제31권5호
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• pp.655-665
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• 2018

소셜 네트워크 서비스(social network service; SNS)는 개개인의 의견을 공유하거나 소통하는 일반적인 도구로 사용되고 있으며, 특히 정치적인 이슈의 전파 과정에서 타인과의 공유를 통하여 자신이 지지하는 후보에 대한 긍정적인 홍보 등을 통해 여론을 형성 또는 확장한다. 기존의 여론 조사 결과는 응답률, 표본 수집의 방식 등과 관련하여 예측의 정확성에 대한 끊임없는 논란이 되어왔다. 본 논문은 이러한 소셜 네트워크 서비스 상에 존재하는 수많은 비정형 데이터의 감성 분석을 통하여 여론조사의 예측력을 개선, 보완하는 방안을 제시하고자 한다. 제시하고자 하는 연구 내용은 비정형 데이터 크롤링 및 기존에 사용되던 감성 사전에 대한 추가적인 보정 과정을 포함하고 있으며, 이를 통하여 본 논문에서 제안하는 방식은 오차의 감소를 통하여 예측력을 개선하는 결과를 나타냈다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권11호
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• pp.5392-5418
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• 2017

The primary aim of this paper is to propose a non-linear regression based technique for mapping different network Quality of Service (QoS) factors to an integrated end-user Quality of Experience (QoE) or Mean Opinion Score (MOS) value for an online video streaming service on a mobile phone. We use six network QoS factors for finding out the user QoE. The contribution of this paper is threefold. First, we investigate the impact of the network QoS factors on the perceived video quality. Next, we perform an individual mapping of the significant network QoS parameters obtained in stage 1 to the user QoE based upon a non-linear regression method. The optimal QoS to QoE mapping function is chosen based upon a decision variable. In the final stage, we evaluate the integrated QoE of the system by taking the combined effect of all the QoS factors considered. Extensive subjective tests comprising of over 50 people across a wide variety of video contents encoded with H.265/HEVC and VP9 codec have been conducted in order to gather the actual MOS data for the purpose of QoS to QoE mapping. Our proposed hybrid model has been validated against unseen data and reveals good prediction accuracy.

• 한국정보시스템학회지:정보시스템연구
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• 제32권2호
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• pp.177-190
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• 2023

Purpose Recently, as a new business marketing tool, short form content focused on fun and interest has been shared as hashtags. By extracting positive and negative keywords from media audiences through comment analysis of social media news, various stakeholders aim to quickly and easily grasp users' opinions on major news. Design/methodology/approach YouTube videos were searched using the YouTube Data API and the results were collected. Video comments were crawled and implemented as HTML elements, and the collection results were checked on the web page. The collected data consisted of video thumbnails, titles, contents, and comments. Comments were word tokenized with the R program, comparing positive and negative dictionaries, and then quantifying polarity. In addition, social network analysis was conducted using divided positive and negative comments, and the results of centrality analysis and visualization were confirmed. Findings Social media users' opinions on issue news were confirmed by analyzing and visualizing the centrality of keywords through social network analysis by dividing comments into positive and negative. As a result of the analysis, it was found that negative objective reviews had the highest effect on information usefulness. In this way, previous studies have been reaffirmed that online negative information has a strong effect on personal decision-making. Corporate marketers will analyze user comments on social network services (SNS) to detect negative opinions about products or corporate images, which will serve as an opportunity to satisfy customers' needs.

• 말소리와 음성과학
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• 제10권1호
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• pp.39-48
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• 2018

A typical statistical parametric speech synthesis (text-to-speech, TTS) system consists of separate modules, such as a text analysis module, an acoustic modeling module, and a speech synthesis module. This causes two problems: 1) expert knowledge of each module is required, and 2) errors generated in each module accumulate passing through each module. An end-to-end TTS system could avoid such problems by synthesizing voice signals directly from an input string. In this study, we implemented an end-to-end Korean TTS system using Google's Tacotron, which is an end-to-end TTS system based on a sequence-to-sequence model with attention mechanism. We used 4392 utterances spoken by a Korean female speaker, an amount that corresponds to 37% of the dataset Google used for training Tacotron. Our system obtained mean opinion score (MOS) 2.98 and degradation mean opinion score (DMOS) 3.25. We will discuss the factors which affected training of the system. Experiments demonstrate that the post-processing network needs to be designed considering output language and input characters and that according to the amount of training data, the maximum value of n for n-grams modeled by the encoder should be small enough.

• 한국전자통신학회논문지
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• 제9권7호
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• pp.773-778
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• 2014

라우팅 정보에 대하여 악성침해를 일으켜 네트워크의 전송성능을 저하시키는 블랙홀 공격에 대한 대응수단으로 IDS(Intrusion Detection System)가 사용되고 있다. 본 논문에서는 IDS가 전송성능에 미치는 영향을 MANET(Mobile Ad-hoc Network)에서 노드의 이동패턴에 기반하여 분석하고, 블랙홀 공격에 대한 효과적인 대응방안을 살펴본다. 성능분석에는 NS-2를 기반으로 한 컴퓨터 시뮬레이션을 사용하며, 응용 서비스로 사용되는 VoIP(Voice over Internet Protocol) 서비스를 대상으로 성능을 측정한다. MOS(Mean Opinion Score)와 호연결율, 종단간 지연을 성능측정 및 분석 파라미터로 사용한다.