• 한국언어정보학회지:언어와정보
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• 제8권1호
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• pp.53-76
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• 2004

Negative polarity items(NPIs), which function as quantifiers are licensed in a syntactically strict way by negatives, which function as qualifiers, resulting in universal negating interpretations as pairs. We present a proposal to explain the related phenomena, in which the syntax and the semantics are closely related to each other, with Combinatory Categorial Grammar. For this purpose, we first adopt the usual approach to scrambling, but control its overgeneration with the use of markers, taking into account the complex syntactic phenomena involving NPIs and scrambling in Korean. We also propose to utilize polarity intensity as a novel feature, in order to account for the universal negating interpretations when NPIs are combined with negatives. Our proposal also explains the difference in readings when other quantifiers or qualifiers intervene the NPI and the related negatives.

• Journal of Power Electronics
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• 제19권5호
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• pp.1315-1325
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• 2019

Aiming at the negative sequence and harmonic problems in the operation of railway static power conditioners, an optimization compensation strategy for negative sequence and harmonics is studied in this paper. First, the hybrid RPC topology and compensation principle are analyzed to obtain different compensation zone states and current capacities. Second, in order to optimize the RPC capacity configuration, the minimum RPC compensation capacity is calculated according to constraint conditions, and the optimal compensation coefficient and compensation angle are obtained. In addition, the voltage unbalance ${\varepsilon}_U$ and power factor requirements are satisfied. A PSO (Particle Swarm Optimization) algorithm is used to calculate the three indexes for minimum compensating energy. The proposed method can precisely calculate the optimal compensation capacity in real time. Finally, MATLAB simulations and an experimental platform verify the effectiveness and economics of the proposed algorithm.

• Journal of electromagnetic engineering and science
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• 제19권1호
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• pp.56-63
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• 2019

Typical negative group delay circuits (NGDC) are analyzed in terms of signal attenuation, group delay, and bandwidth using S-parameters. By inverting these formulations, we derive and present the design equations (for NGD circuit elements) for a desired specification of the two among the three parameters. The proposed design method is validated through simulation examples for narrow- and wide-band pulse inputs in the time and frequency domains. Moreover, an NGDC composed of lumped elements is fabricated at 1 GHz for measurement. As a function of frequency, the circuit-/EM-simulated and measured group delays are in good agreement. The provided simple NGDC design equations may be useful for many applications that require compensations of some signal delays.

• 한국정보시스템학회지:정보시스템연구
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• 제28권1호
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• pp.1-16
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• 2019

Purpose The purpose of this study is to analyze causal relationship between quantity and quality for deriving ranking model of Online reviews. Thus, we propose implications for deriving the ranking model for retrieving Online reviews more effectively. Design/methodology/approach We collected Online review from Tripadvisor web sites which might be a kind of world-famous tourism web sites. We transformed the natural text reviews to quantified data which consists of quantified positive opinions, quantified negative opinions, quantified modification opinions, reviews lengths and grade scores by using opinion mining technologies in R package. We executed corelation and regression analysis about the data. Findings According to the empirical analysis result, this study confirmed that the review length influenced positive opinion, negative opinion and modification opinion. We also confirmed that negative opinion and modification opinion influenced the grade score.

• Asia pacific journal of information systems
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• 제33권3호
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• pp.603-623
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• 2023

While prior work has conducted individuals' password security behavior, there is a relatively neglect to examine individuals' affect and feelings of password fatigue in password change context. Therefore, this study explicated individuals' affective response to the feelings of password fatigue by drawing on several theoretical lens. Survey data collected from 267 users were used to test the model using partial least square analysis. This study found that feelings of password fatigue positively affected the negative password fatigue-induced affect, and also both the feelings of password fatigue and the negative password fatigue-induced affect were negatively related to attitude toward changing passwords, which in turn, leads to the intention to change passwords. Furthermore, this study found that shadow work recognition negatively moderated the relationship between attitude and behavioral intention. This study could offer a new theoretical perspective to understand an individual's security behavior and provide empirical evidences for practitioners in charge of IT security in organizations.

• Asia pacific journal of information systems
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• 제23권3호
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• pp.131-154
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• 2013

New internet technologies have created a revolutionary new platform which allows consumers to make decision about product price and quality quickly and provides information about themselves through the transcript of online reviews. By expressing their feelings toward products or services on virtual opinion platforms, users extend their influence into cyberspace as electronic word-of-mouth (e-WOM). Existing research indicates that an impact of eWOM on the consumer decision process is influential. For both academic researchers and practitioners, investigating this phenomenon of information sharing in online website is essential given the increasing number of consumers using them as sources of purchase decisions. It is worthwhile to examine the extent to which opinion seekers are willing to accept and adopt online reviews and which factors encourage adoption. Discerning the most motivating aspects of information adoption in particular, could help electronic marketers better promote their brand and presence on the internet. The objectives of this study are to investigate how online WOM influences a persons' purchase decision by discovering which factors encourage information adoption. Especially focused on the self-efficacy, this research investigates how self-efficacy affects on information usefulness and adoption of online information. Although people are exposed to same review or comment about product or service, some accept the reviews while others do not. We notice that accepting online reviews mainly depends on the person's preference or personal characteristics. This study empirically examines this issue by using cognitive dissonance theory. Specifically, in the movie industry, we address few questions-is always positive WOM generating positive effect? What if the movie isn't the person's favorite genre? What if the person who is very self-assertive so doesn't take other's opinion easily? In these cases of cognitive dissonance, is always WOM generating same result? While many studies have focused on one direct of WOM which indicates positive (or negative) informative reviews or comments generate positive (or negative) results and more (or less) profits, this study investigates not only directional properties of WOM but also how people change their opinion towards product or service positive to negative, negative to positive through the online WOM. An experiment was conducted quantitatively by using a sample of 168 users who have experience within the online movie review site, 'Naver Movie'. Users were required to complete a survey regarding reviews and comments taken from the real movie page. The data reflected user's perceptions of online WOM information that determined users' adoption level. Analysis results provide empirical support for the proposed theoretical perspective. When user can't agree with the opinion of online WOM information, in other words, when cognitive dissonance between online WOM information and users' preference occurs, perceived self-efficacy significantly decreases customers' perception of usefulness. And this perception of usefulness plays an important role in determining users' intention to adopt online WOM information. Most of researches have been concentrated on characteristics of online WOM itself such as quality or vividness of information, credibility of source and direction of online WOM, etc. for describing effect of online WOM, but our results suggest that users' personal character (e.g., self-efficacy) plays decisive role for acceptance of online WOM information. Higher self-efficacy means lower possibility to accept the information that represents counter opinion because of cognitive dissonance, whereas the people that have lower self-efficacy are willing to accept the online WOM information as true and refer to purchase decision. This study suggests a model for understanding role of direction of online WOM information. Also, our result implicates the importance of online review supervision and personalized information service by confirming switching opinion negative to positive is more difficult than positive to negative through the online WOM information. This implication would help marketers to manage online reviews of their products or services.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제4권3호
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• pp.121-128
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• 2015

소수 의견을 포함하는 온라인 상품평은 긍정 또는 부정 일변도인 상품평에서는 찾기 어려운 유익한 정보를 내포하기도 한다. 본 논문에서는 주어진 상품평 집합 속에서 소수상품평을 검색하는 방법을 제안한다. 제안방법은 개별 상품평을 먼저 긍정/부정 상품평으로 자동분류한 뒤, 주어진 상품평 집합의 긍정/부정 상품평의 비대칭도를 계산하여 소수상품평을 검색한다. 소수상품평 검색에서는 긍정/부정 자동분류 성능이 소수상품평 검색성능에 영향을 주는데, 본 논문에서는 도메인에 특화된 감성사전과 그렇지 않은 일반적인 감성사전을 가지고 상품평을 긍정/부정으로 감성분류한 뒤 비대칭도를 계산하여 소수상품평 검색성능을 비교한다. 스마트폰과 영화를 다룬 온라인 영문 상품평에 대하여 도메인에 특화된 감성사전을 가지고 소수상품평 검색성능을 평가한 결과, F1점수는 각각 24.6%와 15.9%였고, 정확도는 각각 56.8%와 46.8%였다. 이는 스마트폰과 영화의 개별 상품평 긍정/부정 분류 정확도가 각각 85.3%와 78.8%일 때의 성능이다. 본 논문에서는 또 긍정/부정 자동분류 성능이 주어졌을 때의 이론적인 소수상품평 검색성능에 대해서도 논의한다.

• 한국정보통신학회논문지
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• 제20권4호
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• pp.811-818
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• 2016

추가적인 부궤환 루프를 가지는 연속 미세 조절 위상 고정루프를 소개하였다. 위상고정루프가 위상이 고정되지 않았을 때 위상고정루프는 연속적인 밴드 선택 루프를 통하여 빠르게 위상을 고정시키는 특성을 가지고 있다. 위상고정루프가 고정 상태에 다다랐을 때 밴드 폭은 미세한 루프를 통해서 좁아진다. 추가적인 부궤환 루프는 안정성과 위상여유 성능을 향상시킨다. 0.18um CMOS 공정으로 제작한 위상고정루프의 결과 측정은 위상 잡음이 742.8MHz 캐리어 주파수로부터 2MHz 오프셋 주파수에서 -109.6dBc/Hz을 보여준다.

• The Journal of Korean Physical Therapy
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• 제19권3호
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• pp.41-46
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• 2007

Purpose: This study was to investigate how dose the radiography findings are to magnetic resonance (MR) image findings in the L5-S1 instability patients. The subjects of this study were comprised of eleven males and fifteen females, who had Lumbago and agreed with this research. Methods: Radiography and MR images of Lumbar spine were acquired respectively from subjects in conditions of maximum flexion and extension. The horizontal and angular displacements in lumabosacral spine radiography were used to assess the instability of lumbar spine. MR images were also used to evaluate the intervertebral disc abnormalities and change of bone marrow. Results: The results are as follows. 1. In the case of flexion transitional displacement proposed by Dupuis et al, the specificity and negative predictive value were good accuracy ($0.7{\sim}0.8$), and the negative predictive value was in average. In the case of extension displacement, the negative predictive value was about average ($0.6{\sim}0.7$), but the sensitivity, specificity and positive predictive value were below the poor (<0.6). On the other side, the specificity was about average but other things were below in the case of angular displacement. 2. In the case of flexion transitional displacement proposed by Dupuis et al., compared with the intervertebral disc abnormalities, the negative prediction value was excellent, the sensitivity good, and the specificity about average. In the case of extension, the negative prediction value was about average, but the other things were poor. On the other side the specificity and negative predictive value had good accuracy and the sensitivity and positive prediction value were below average in the case of angular displacement. Conclusion: The above results show that the radiography finding is sufficiently helpful to find the lumbar spine instability as an economic point of view.

• 한국산업정보학회논문지
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• 제23권2호
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• pp.93-107
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• 2018

본 연구의 목적은 기업이 신제품의 실패로 인한 위기상황에서 실시하는 위기대응 전략에 대한 소비자의 부정적 구전에 대하여 알아보고자 한다. 이를 위해 가상의 기업을 사용하여 위기 시나리오 및 대응전략을 조작한 다음 실험을 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 대응유형 전략에 따르면, 위기 대응전략은 부정보다 사과를 실시하는 것이 부정적 구전을 더 완화시키는 것으로 나타났다. 둘째, 신제품 실패로 인한 위기 이전에 공익연계마케팅 활동을 실시한 회사는 소비자의 부정적 구전 완화에 더욱 효과적인 것으로 나타났다. 셋째, 기업이 실시하는 메시지 전략은 소비자의 부정적 구전에 영향을 미치지 않는 것으로 나타났다. 넷째, 위기대응전략과 공익연계 마케팅의 상호작용 효과는 유의하게 나타났지만 위기대응 전략과 메시지 전략 간의 상호작용효과는 유의하지 않은 것으로 나타났다.