• Asian Journal for Public Opinion Research
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• 제10권2호
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• pp.76-101
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• 2022

Despite the increasing use of digital media and their powerful impact on risk management during recent outbreaks of emerging infectious diseases, the question of how digital media exposure influences preventive behaviors has not been fully explained. Using the appraisal tendency framework and protection motivation theory as theoretical frameworks, we theorized the affective and cognitive mechanisms under which the differential roles of three negative emotions (fear, anger, worry) on two cognitive appraisals (perceived threat and perceived efficacy) were examined. Based on data collected from a survey of 1,500 South Koreans during the COVID-19 pandemic, we found that while worry and anger increased perceived efficacy, fear reduced perceived efficacy. The results also showed that although exposure to COVID-19 information via digital formats increased preventive behavioral intention in general, digital media use for COVID-19 information had a negative influence on preventive behavioral intention through the sequential mediation of fear and perceived efficacy.

• 디지털산업정보학회논문지
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• 제8권1호
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• pp.191-205
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• 2012

A book review is one of the most important sources of information which provide the descriptive and evaluative contents about books. Reviews have great influence on consumer behavior because they are believed to be more reliable than information provided by sellers. Readers who read a book review includes information about book decide whether they will buy or not. This study examines customer attitude change by book reviews with regarding to different type of information sources(experts and prior customers) and different directions of messages. We address the following research questions: (1) Can positive book reviews with credibility have a positive impact on acceptance of books? (2) Can negative book reviews with credibility have a negative impact on acceptance of books? The results shows that a credibility is an essential factor for affecting customers' mind. When positive book reviews were written, both expert and customer opinions have a positive impact on acceptance of customers. Given negative book reviews of experts, trustworthiness is more important than expertise. However, a objectivity of customer's reviews is more important.

• 유통과학연구
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• 제19권1호
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• pp.27-35
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• 2021

Purpose: This study is to investigate the effect of managerial ownership level in distribution and service companies on the stock price crash. The managerial ownership level affects the firm's information disclosure policy. If managers conceal or withholds business-related unfavorable factors over a long period, the firm's stock price is likely to plummet. In a similar vein, management's equity affects information opacity, and information asymmetry affects stock price collapse. Research design, data, and methodology: A regression analysis is conducted using the data on companies listed on the Korea Composite Stock Price Index (KOSPI) between 2012-2017 to examine the effect of the managerial ownership level on stock price crash risks. Results: Logistic and regression results indicate that the stock price crash risk was reduced as managerial ownership levels are increased. The managerial ownership level has a significant negative coefficient on stock price crash risk, negative conditional return skewness of firm-specific weekly return distribution, and asymmetric volatility between positive and negative price-to-earnings ratios. Conclusions: As the ownership and management align, the likeliness of withholding business-related information is reduced. This study's results imply that the stock price crash risk reduces as the managerial ownership level increases because shareholder and manager interests coincide, thereby reducing information asymmetry.

• Asia pacific journal of information systems
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• 제25권4호
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• pp.784-804
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• 2015

This study investigates the effects of a two-sided message on product attitude and purchase intention by using a message structure variable, such as attribute importance in the context of online consumer reviews (OCRs). Study 1 explains the previous inconsistent results of a two-side message by comparing a one-side message and a two-side message by using the attribute importance in negative reviews. Study 2 determines the reasons for the inconsistent results of a refutational two-sided message research by using the attribute importance in negative reviews and website trust. Two experiments are designed to test our hypotheses. The first experiment is a $2{\times}2$ factorial design with 84 participants. The second experiment uses a $2{\times}2{\times}2$ factorial design with 196 participants. In study 1, two-sided OCRs are more credible than one-sided OCRs, and two-sided OCRs that use low important attributes are more effective in making favorable product attitude/purchase intention. In study 2, refutational two-sided OCRs that use high attribute importance render positive effects on product attitudes in trustworthy websites. However, the refutation could negatively affect product attitude/purchase intention in low trustworthy websites.

• 한국정보시스템학회지:정보시스템연구
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• 제19권4호
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• pp.253-270
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• 2010

The adjustment of negative emotions in later life is related to the quality of life and life satisfaction. any studies have examined how to control the negative emotions in related to physical, psychological, and social relationships. As the digital media and contents positively influence elder's mental and somatic well-being, it is significant to examine this problem from IT usage, especially the selection of digital contents. This study validated the theoretical study through a qualitative exploratory study comprising both negative emotions and the selection of digital contents, and empirically tested the proposed research model on the older people. The result shows the pattern of linkages between the grief of loss and the pursuit of digital contents. Loss from being parted by death and loss of relations was positively related to the information seeking contents. Economical loss and loss of physical functions was positively related to the innovation seeking contents. Loss of physical functions and Loss from being parted by death was positively related to the emotion seeking contents. And economic loss and loss of relations was positively related to the entertainment seeking contents.

• 한국정보통신학회논문지
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• 제13권12호
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• pp.2603-2608
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• 2009

문서군집은 정보검색의 많은 응용분야에 사용되는 중요한 문서 분석 방법이다. 본 논문은 비음수 행렬 분해 (NMF, non-negative matrix factorization)를 군집방법과 군집의 응집도(coherence of cluster)를 이용한 군집 내 문서들의 정제를 이용한 새로운 문서군집방법을 제안한다. 제안된 방법은 문서집합의 내부구조를 나타내는 의미특징행렬과 의미변수행렬 이용하여 문서군집의 성능을 높일 수 있고, 문장들 간의 유사도에 기반 한 군집의 응집도를 이용하여 군집내의 문서들을 정제하여서 재 할당함으로써 군집의 효율을 향상시킬 수 있다. 실험결과 제안방법을 적용한 문서군집방법이 다른 문서군집 방법에 비하여 좋은 성능을 보인다.

• 산경연구논집
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• 제11권2호
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• pp.49-59
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• 2020

Purpose: Online and social media and mobile shopping are increasing and companies are required to provide personal information in order to supplement the non-invasive characteristics of the channels. With the increased provision of personal information, consumers' personal and social concerns about the prevention of personal information infringement are also increasing, and in response, personal or opt-in marketing has emerged to compensate for reckless information abuse. Despite the background of this emergence, the existing prior studies are limited to ignoring the negative feelings of consumers in the real world, including only the net function and positive effect of the opt-in mail. Research design, data and methodology: The research framework was intended to utilize the impact of human marketing activities on consumer attitudes combined with positive and negative factors. Factors that positively affect attitudes toward permation marketing were presented, such as informality, and perceived risks were presented as negative impact factors. Also, based on previous prior research, the prior factors of opt-in marketing were to present the effect on purchase intent through the medium of attitude toward opt-in marketing. Results: In this study, we used the framework of a two factor theory to address positive and negative factors as a leading factor in the customer attitude toward opt-in mail advertising, and as a result, functionality and personalization have a positive effect on customer attitude and perceived risk have a negative impact on customer attitude. In addition, it was confirmed that the customer attitude formed this way affects the intention to purchase again. Conclusions: This study suggests that we have demonstrated that marketing, an opt-in marketing that has been recognized as part of marketing that is deployed after obtaining customer consent, has been applied without any other marketing methodology. E-mail advertising at this point also provides practical implications that the system safeguards are in place under an opt-in protocol or system, and that even if an e-mail advertisement is carried out, customers will need to look at the level of awareness about the risks, and suggests that they need to consider the customer's journey that could lead to purchase at the content level.

• 한국통신학회논문지
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• 제39C권5호
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• pp.418-424
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• 2014

본 논문에서는 반사형 반도체 광 증폭기 (RSOA)를 이용하여 음계수를 가지는 광 마이크로파 노치 필터를 제안하고 구현하였다. 제안된 마이크로파 노치 필터의 음계수는 RSOA의 상호 이득 변조 (XGM) 현상을 통하여 얻어진다. RSOA가 이득 포화 영역에서 동작할 때 변조된 펌프 광과 연속파를 가지는 프로브 광을 RSOA 내에 주입하게 되면, XGM 현상으로 인하여 프로브 광은 펌프 신호의 반전된 형태의 신호로 변조된다. 이러한 두 신호들은 파장 의존적 시간 지연 특성을 갖는 단일 모드 광섬유 (SMF)에 의하여 프로브 신호와 펌프 신호 사이에 시간지연이 발생한다. 제안된 마이크로파 노치 필터는 35.1 dB 이상의 notch dips과 약 380.6 MHz의 free spectral range (FSR)을 가진다.

• 한국전자파학회논문지
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• 제19권8호
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• pp.920-926
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• 2008

본 논문에서는 확장된 대역폭을 갖는 소형 epsilon negative(ENG) zeroth-order resonance(ZOR) 안테나를 제안하였다. 대역폭을 유지하고 ENG ZOR 안테나의 면적을 줄이기 위해서 안테나 패치 위에 패턴을 새겼고 meandered via를 삽입함으로써 매우 큰 병렬 인덕턴스를 발생시켰다. 동일한 면적, 공진 주파수에서 동작하는 ENG ZOR 안테나에 직선 via 대신 meandered via를 삽입하게 되면 유효 유전율의 분포의 기울기가 공진 주파수 근방에서 더 낮아지고 따라서 대역폭은 넓어진다. 결과적으로 제안한 meandered via를 가진 ENG ZOR 안테나는 직선 via를 가진 나선 구조 ENG ZOR 안테나와 동일한 면적을 가짐에도 불구하고 1.38배의 대역폭을 가지고 있는 것을 확인하였다. 또한, meandered via를 가진 ENG ZOR 안테나는 일반적인 mushroom ZOR 안테나보다 64 %의 면적감소를 보였다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제14권4호
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• pp.457-462
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• 2014

This letter proposes a low-jitter DLL-based clock generator with two negative feedback loops. The main negative feedback loops suppress the jitter of DLL. The additional negative feedback loops suppress the delay-time variance of each delay stages. Both two negative feedback loops in a DLL results in suppressing the jitter of clock signal further. Measurement results of the DLL-based clock generator with two negative feedback loops fabricated in a one-poly six-metal $0.18{\mu}m$ CMOS process show 5.127-ps rms jitter and 47.6-ps peak-to-peak jitter at 1 GHz.