重金屬이 Chlorella 세포의 生長및 呼吸能에 미치는 影響

朴載錫,金鍾均,李永祿,崔鎬亨 공주대학교 사범대학 과학교육연구소 1980 과학교육연구 Vol.12 No.1

Chlarella ellipsoidea를 Hg, Cu, Pb, Zn과 같은 중금속 처리배지에서 배양하고 배양중 일정량의 세포를 收穫하여 생장률 및 엽록소 함량을 측정하고 여러농도에서 呼吸能을 측정 비교하였다. 1) 중금속 처리구에서의 세포의 生長, 엽록소함량 호흡能은 정상세포에 비해 정도의 차이는 있으나 모두 감소하였다. 2) 생장장해는 엽록소형성能과 비슷한 저하현상을 보였으며 ??서는 Hg가 가장 심한 장해 를 나타내었고 다음으로 Cu Zn Pb의 順이었다. 그러나 ?? Zn처리구에서는 ?? Hg나 Cu및 ?? Pb처리구보다 심하였다. 3) ??에서의 Hg및 Cu처리구에서는 각각 접종후 3시간 및 41시간후에 황백화현상과 더불어 사멸하였다. 4) 呼吸能은 대체로 ??이상의 농도에서 억제되는 경향을 나타내었다. Chlorella ellipsoidea cells were cultured in a Mercury, Lead, Copper or Zinctreated medium. Some portions of the cells were taken out at intervals during the culture, and the growth rate, the chlorophyll content and the respiratory activity of the cells were meaured. 1. Growth rate, chlorophyll content and respiratory activity of the heavy metaltreated cells decreased more or less, compared with these of the normal cells. 2. The growth retardation showed the similar tendency to the lowering of biosynthesis of chlorophyll, which in ?? medium came out to gradually severe in follow order, Lead, Znic, Copper, and Mercury. But the growth of the cells in ?? Zinc-treated medium was retarded more severely than in ?? Mercury or Copper and ?? Lead-treated medium. 3. The cells in the medium containing 1?? Mercury died out with chlorosis 3 hours later after inoculation, and those in ?? Copper-treated medium, 41hours later. 4. Generally the respiratory activity showed a tendency to de controlled in ?? and over.

PROMOTING BEAUTY PRODUCTS IN SOCIAL MEDIA: EFFECTS OF ENDORSER CHARACTERISTICS AND SOCIAL DISTANCE

Yung Kyun Choi,Ruo Nan Zhang,Eunyoung Christine Sung 글로벌지식마케팅경영학회 2021 Global Fashion Management Conference Vol.2021 No.11

Toward Developing Marketing Strategies in Turbulent Environment

Yung Kyun Choi 한국마케팅과학회 2010 마케팅과학연구 Vol.20 No.4

This article summarizes the articles found in this special issue, which were chosen from the papers submitted to 2010 Global Marketing Conference at Tokyo. This special issue provides readers with an interesting mix of topics and methods in the context of complex and global marketing environments. Marketing practitioners will find some good ideas and new approaches to deal with a turbulent marketing world. Marketing researchers will obtain insights for future research.

Motivating Factors for An Expected Use of DMB Service and Its Marketing Implications

Choi Yung Kyun 한국마케팅과학회 2006 한국마케팅과학회 학술대회 발표 논문집 Vol.- No.-

HOW TO INCREASE SHARING IN SOCIAL MEDIA? EFFECTS OF SOCIAL TIE, TEMPORAL DISTANCE, AND MESSAGE TYPE

Yung Kyun Choi,Sukki Yoon 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7

Social media as an online channel for sharing and participating can play an important role for many marketing activities. Social media can be especially influential in word of mouth (WOM) communication as the focus of it is the sharing of information regarding consumers’ product experiences. To use social media as a marketing tool, identifying the relationship between message sender and receiver (the strength of social tie) is important in the viral marketing campaign context. Also, the effects can be influenced by message type, and consumers’ situational context. Therefore, the study examines the consumers’ intention to share advertising message with others in social media focusing on the strength of social ties (strong vs. weak tie) between message receivers and senders. The authors hypothesize that participants’ intention for sharing will be higher for the message recipients of strong tie than of weak tie. Especially, the sharing intention, for strong tie than for weak tie, will be higher when there is a match between message type (visual vs. text) and consumers’ purchasing context (close vs. far distance). The study used 2(temporal distance: close vs. distant) x 2(message type: text vs. picture) x 2 (close friends, vs. general public) design with the first two factors as between –subject factors and the last factor as a within-subject factor. A total of 107 student subjects participated in an experiment. They were recruited from a private university, in Seoul, in exchange for extra credit. The participants’ average age was 22 (SD=2.72) and 58 percent of them were males.

EFFECTIVE LUXURY BRAND ADVERTISING FOR SOCIAL MEDIA: MESSAGE ARGUMENTS, SOCIAL TIES, AND CULTURE

Yung Kyun Choi,Yuri Seo,Udo Wagner 글로벌지식마케팅경영학회 2017 Global Fashion Management Conference Vol.2017 No.07

There has been an emerging interest in the effective luxury advertising, which has been conducted within and across national borders. Unlike earlier studies on luxury brands that focused on the behavior and opinions of luxury consumers (e.g., luxury motivations, value perceptions, etc.), this nascent stream of research queries an important role that advertising exerts on luxury consumers (Freire, 2014). Informed by these developments, our study examines how luxury brand marketers can design effective social media messages for their consumers. In particular, we draw on recent research in consumer psychology to shed new light on (1) how consumer feelings about the psychological distance of luxury consumption may influence their evaluation of different types of message appeals on social media and their intention to share these messages with others; and (2) we address how this process varies depending on (a) the perceived tie strength between consumers on social media, the functional attitudes of luxury brands, and across different cultural milieus.

E-WOM messaging on social media : Social ties, temporal distance, and message concreteness

Choi, Yung Kyun,Seo, Yuri,Yoon, Sukki Emerald (MCB UP ) 2017 INTERNET RESEARCH Vol.27 No.3

<P>Originality/value - By studying senders' perspectives, the authors make a new theoretical and practical contribution to the emerging literature on E-WOM communication. Specifically, the authors show how senders are persuaded to share information with their strong- or weak-tie audiences according to the concreteness of a message and temporal distance. The authors add construal-level theory and advertising message processing to the domain of E-WOM and social ties research.</P>

온라인 환경에서 시각화된 제품경험이 소비자의 제품정보에 대한 신뢰감 형성 및 거래위험도 지각에 미치는 영향

최영균(Choi, Yung Kyun) SBS 2007 미디어경제와 문화 Vol.5 No.4

EFFECTS OF IMAGE CLOSENESS ON THE PERSUASIVENESS OF ADVERTISEMENT

Sungmi Lee,Kyuha Kim,Yung Kyun Choi 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7

The study examines the role of image closeness in advertising persuasiveness. To understand how consumers process different degree of image closeness in advertising, we apply construal level theory (CLT) suggests consumers’ perceived spatial distance of visual stimuli influence their level of construal. It also investigates how advertising’s message appeals (rational vs. emotional) and product types (utilitarian vs. hedonic) moderate the effects of construal level on advertising effectiveness. Drawing on CLT, the authors hypothesize that rational appeals will be more persuasive when consumers perceive the product image in advertising as spatially close, while emotional appeals will be more persuasive when consumers perceive it as spatially distant. The study employed 2(near vs. far distance)x2(rational vs. emotional appeal)x2 (utilitarian vs. hedonic product) factorial design. A total of 232 people (108 males) participated in the experiment. Results revealed that spatial distance and advertising appeals had significant interaction effects on attitude towards ad and brand attitude. Particularly, when the image shot looks close, rational appeals are more persuasive than emotional appeals. Comparatively, when the image looks distant, emotional appeals are more persuasive than rational appeals. The two-way interaction between advertising appeals and product type are also significant for attitude toward ad and brand attitude. Particularly, rational appeals for utilitarian product were more persuasive and while emotional appeals for hedonic product were more persuasive. Finally, three way interaction between spatial distance, advertising appeals, and product type had significant effects on brand attitude. When the image looks close, the superior effects of rational appeal compared to emotional appeal was greater in utilitarian product than in hedonic product. Conversely, when the image looks distant, the superior effects of emotional appeal compared to rational appeal was greater in hedonic product than in utilitarian product. Theoretical and practical implications are discussed.

SOCIAL MEDIA EFFECTIVENESS USING WEB ANALYTICS

Kacy Kim,Sukki Yoon,Yung Kyun Choi,Younghwa Lee 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7

This study is intended to provide marketing practitioners with an overview of web analytics to explore the issue of how to define and measure the effectiveness of social media through analyzing the various activities of current/potential consumers as well as provide a comprehensive analysis of the effectiveness of digital content marketing using social media. These analytics answer broad questions about which types of social media metrics are best at referring traffic, about conversations at the organization’s website, and about comparing different social media channels, such as Facebook and Twitter in this study. The major goal of this study is to demonstrate the value of businesses’ efforts and to optimize their digital/social marketing strategy using web analytics. Based on this goal three research questions were identified: (1) can the model identify social media performance variables that are related to audience response which can be represented by website traffic?; (2) which social media sties are driving traffic to a firm’s website, specifically in B2B environment?; and (3) can the model provide insight into the importance of those variables? These analytics employ time series analysis to specifically address activities in SNSs that effectively drive traffic to a website and accomplish business goals. This study is one of the first empirical investigations in the marketing communication field related to measuring social media’s effectiveness.