• Title, Summary, Keyword: 편승효과

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A Confirmation of Identified Multiple Outliers and Leverage Points in Linear Model (다중 선형 모형에서 식별된 다중 이상점과 다중 지렛점의 재확인 방법에 대한 연구)

  • 유종영;안기수
    • The Korean Journal of Applied Statistics
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    • v.15 no.2
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    • pp.269-279
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    • 2002
  • We considered the problem for confirmation of multiple outliers and leverage points. Identification of multiple outliers and leverage points is difficult because of the masking effect and swamping effect. Rousseeuw and van Zomeren(1990) identified multiple outliers and leverage points by using the Least Median of Squares and Minimum Value of Ellipsoids which are high-breakdown robust estimators. But their methods tend to declare too many observations as extremes. Atkinson(1987) suggested a method for confirming of outliers and Fung(1993) pointed out Atkinson method's limitation and proposed another method by using the add-back model. But we analyzed that Fung's method is affected by adjacent effect. In this thesis, we proposed one procedure for confirmation of outliers and leverage points and compared three example with Fung's method.

Hadi와 Simonoff의 다중이상점 식별방법의 개선과 여러 다중이상점 식별방법의 효율성 비교

  • 유종영;김현철
    • Communications for Statistical Applications and Methods
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    • v.3 no.3
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    • pp.11-23
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    • 1996
  • 본 연구에서는 선형회귀분석에서 Hadi와 Simonoff의 다중이상점 식별방법을 수정하여 새로운 알고리즘을 제시하였다. Hadi와 Simonoff의 알고리즘 첫 단계에서 이상점일 가능성이 없는 점들의 집합을 추출할 때 가장효과와 편승효과에 영향을 받을 수 있음으로, 이 첫 단계를 수정하였다. 우리는 잔차가 일정한 분산을 갖는 정규분포에 다르다는 가정하에서 잔차의 신뢰구간을 생각하고, 이 구간안에서 잔차의 MAD가 최소인 새로운 모형을 탐색하고, 이를 이상점일 가능성이 없는 점들의 집합을 추출하는데 일용하는 새로운 알로리즘을 제시하였다. 제시된 방법은 실제자료에서 다른 방법에 비해 효율적으로 이상점을 식별할 수 있었다.

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The Fandom Effect on the Success of Web-drama in Korea: Mediation Effect of the Number of People Registered in the Channel (원작의 유무와 아이돌 출연이 웹드라마 흥행에 미치는 영향: 채널구독자수의 매개효과를 중심으로)

  • Kim, Sunky;Yu, Gun Jea
    • The Journal of the Korea Contents Association
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    • v.18 no.8
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    • pp.240-254
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    • 2018
  • This study investigated the antecedents of web-drama success as the interests on web-drama is increasing. We focused on the factors which help web-drama success because current studies on web-drama has focused on the description of market. We examined the effect of fandom on the success of web-drama using the data of constv site which provided with the rank (1-100) of web-drama between February 1st and March 1st in 2016. We found that the fandom had a positive effect on the success of web drama. In addition, we also found that the number of people registered in web-drama channel mediated the relationship between the fandom and the success of web-drama. This study contributed to the current literature by revealing the factors which enable the success of web-drama.

Exploring Cognitive Biases Limiting Rational Problem Solving and Debiasing Methods Using Science Education (합리적 문제해결을 저해하는 인지편향과 과학교육을 통한 탈인지편향 방법 탐색)

  • Ha, Minsu
    • Journal of The Korean Association For Science Education
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    • v.36 no.6
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    • pp.935-946
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    • 2016
  • This study aims to explore cognitive biases relating the core competences of science and instructional strategy in reducing the level of cognitive biases. The literature review method was used to explore cognitive biases and science education experts discussed the relevance of cognitive biases to science education. Twenty nine cognitive biases were categorized into five groups (limiting rational causal inference, limiting diverse information search, limiting self-regulated learning, limiting self-directed decision making, and category-limited thinking). The cognitive biases in limiting rational causal inference group are teleological thinking, availability heuristic, illusory correlation, and clustering illusion. The cognitive biases in limiting diverse information search group are selective perception, experimenter bias, confirmation bias, mere thought effect, attentional bias, belief bias, pragmatic fallacy, functional fixedness, and framing effect. The cognitive biases in limiting self-regulated learning group are overconfidence bias, better-than-average bias, planning fallacy, fundamental attribution error, Dunning-Kruger effect, hindsight bias, and blind-spot bias. The cognitive biases in limiting self-directed decision-making group are acquiescence effect, bandwagon effect, group-think, appeal to authority bias, and information bias. Lastly, the cognitive biases in category-limited thinking group are psychological essentialism, stereotyping, anthropomorphism, and outgroup homogeneity bias. The instructional strategy to reduce the level of cognitive biases is disused based on the psychological characters of cognitive biases reviewed in this study and related science education methods.

A Study on the Middle.High School Students' Media Education Using Motive Effect in School Achievement: Focusing on the Academic Self-Efficacy and Media Competence (중.고등학생들의 미디어 교육 이용 동기가 학업성적에 미치는 영향에 관한 연구: 학업적 자기 효능감과 미디어 능력을 중심으로)

  • Rhee, Jung-Chun;Kim, Eun-Gyoo;Kang, Jin-Suk;Park, Sang-Ho
    • Korean journal of communication and information
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    • v.37
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    • pp.43-72
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    • 2007
  • This article is media education uses type of a middle high school students and research about effect that is taking media education. Measured media education uses motivation, studies own effect academic self-efficacy, media competence and school achievement for this research. As analysis result, priority media education uses motive was 'teaching convenience/help sought', 'Information/education method picking up sought', 'new teaching/communication thoroughgoing sought', 'ability elevation pursuit', 'self-regulating education sought', 'up-to-dateness sought', 'New knowledge/education sought' of order. By next time, only 'new knowl edge/education sought' motive caused positive effect in studies own effect among media education uses motive. Among media education uses motive, 'teaching convenience/help sought', 'Information/education method picking up sought', 'New study/communication thoroughgoing sought', 'self-regulating education sought', 'up-to-dateness sought' motive caused positive effect in media competence. Also, it caused positive effect among media education uses motive 'self-regulating education sought' and 'new knowledge/education sought' in students' school achievement. Finally, 'academic self-efficacy' is 'media competence' more in school achievement influence. Media education influenced new teaching method and ability elevation to some students. But, academic self-efficacy and school achievement did not cause big effect students. However, media education influenced in some students' media competence elevation.

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A Study about The Impact of Music Recommender Systems on Online Digital Music Rankings (음원 추천시스템이 온라인 디지털 음원차트에 미치는 파급효과에 대한 연구)

  • Kim, HyunMo;Kim, MinYong;Park, JaeHong
    • Information Systems Review
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    • v.16 no.3
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    • pp.49-68
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    • 2014
  • These days, consumers have increasingly preferred to digital real-time streamlining and downloading to listen to music because this is convenient and affordable for the consumers. Accordingly, sales of music in compact disk formats have steadily declined. In this regards, online digital music has become a new communication channel to listen musics, where digital files can be delivered over various online networks to people's computing devices. The majority of online digital music distributors has Music Recommender Systems for sales of digital music on their websites. Music Recommender Systems are parts of information filtering systems that provide the ratings or preferences that users give to music. Korean online digital music distributors have Music Recommender Systems. But those online music distributors didn't provide any rules or clear procedures that recommend music. Therefore, we raise important questions as follows: "Is Music Recommender Systems Fair?", "What is the impact of Music Recommender Systems on online music rankings and sales?" While previous studies have focused on usefulness of Music Recommender Systems, this study investigates not only fairness of Current Music Recommender Systems but also Relationship between Music Recommender Systems and online Music Charts. This study examines these issues based on Bandwagon effect, ranking effect, Slot effect theories. For our empirical analysis, we selected the most famous five online digital music distributors in terms of market shares. We found that all recommended music is exposed to the top of 'daily music charts' in online digital music distributors' websites. We collected music ranking data and recommended music data from 'daily music chart' during a one month. The result shows that online music recommender systems are not fair, since they mainly recommend particular music that supported by a specific music production company. In addition, the recommended music are always exposed to the top of music ranking charts. We also find that recommended music usually appear at the top 20 ranking charts within one or two days. Also, the most music in the top 50 or 100 ranks are the recommended music. Moreover, recommended music usually remain the ranking charts more than one month while non-recommended music often disappear at the ranking charts within two week. Our study provides an important implication to online music industry. Because music recommender systems and music ranking charts are closely related, music distributors may improperly use their recommender systems to boost the sales of music that related to their own companies. Therefore, online digital music distributor must clearly announce the rules and procedures about music recommender systems for the better music industry.

Analysis of the Current Situation about the Computer Education of Commercial High School placing empasis on Gwang-Ju city area (상업계 고등학교 컴퓨터 교육에 관한 현황분석(광주광역시 중심))

  • Ahn, Ju-Young
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.906-909
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    • 2007
  • The method of distributing some questionnaires to the total 4 schools in the area of Gwang-ju city and then collect them later has been used in this study. By using the coefficient of Cronbach's alpha for the collected data, the trust rate of the method of questionnaires have been verified. In conclusion it's been analized that there are disparities in 'computer education course, professor lesson, possibility of computer use, teaching obstacles, self development of teachers, choice and organization of the computer education contents' according to the general situation of the teachers who charge computer education sand there are also disparities in 'goal of computer education, computer curriculum related learning activity, computer curriculum related learning satisfaction, practical use of computer facility, interested contents of students, other lessons besides regular education course' according to the general situation of the students who receive computer education in commercial high school.

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Hacking and Countermeasure on Smart TV (스마트 TV 해킹 위협 및 대응방안 분석)

  • Hong, Sunghyuck
    • Journal of Digital Convergence
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    • v.12 no.1
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    • pp.313-317
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    • 2014
  • Smart-phone, PC or tablet platforms, such as smart terminals spread to the masses trying to capitalize. Smart TV also is increasing. In Korea, market size of TV is growing fast with growth of risk of hacking. In this paper, several kinds of Smart TV hacking cases are presented with the possibility of attacks against the vulnerability analysis and countermeasures. Most of the Linux operating system is open. Thus, it is vulnerable for latest hacking techniques. Most are based on the Linux OS to enhance security mount Sand-Box. However, bypass procedure using the technique, or APT attacks can avoid San-Box technique. New hacking techniques and a variety of ways will occur in the future. Therefore, this paper will develop Smart TV, and it analysis of a security threat and establishes better prepared in the future because new hacking attacks are expected to prepare more.

A Reexamination of the Impact of the Fit of Corporate Social Responsibility on the Brand Attitude: The Perspective of Brand Hierarchy (기업의 사회적 책임(CSR)활동의적합성이 브랜드 태도에 미치는 영향에 관한 재고찰: 브랜드 계층구조 관점에서)

  • YANG, JAEHO;Seo, Hae-Jin;Song, Tae-Ho
    • (The) Korean Journal of Advertising
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    • v.27 no.8
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    • pp.59-90
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    • 2016
  • Consumers demand that corporates fulfill their social responsibility by exerting influence over not only economical values but also social values in markets. Given such a social mood, most corporates are actively engaging in Corporate Social Responsibility(CSR) activities, and marketing scholars continue to study the effects of such CSR activities. Numerous such studies examined the relationship between CSR activity and brand equity. Moreover, virtually, a majority of these studies focused on consumer responses to CSR activity from an individual brand perspective. In a situation in which brand management must consider the spillover effects of brands, firms holding various brands should consider these spillover effects when they establish CSR activity strategies. Therefore, we examine the effects of CSR activity using a comprehensive approach that considers the hierarchy of brands. Additionally, we develop a new perspective on fit that has been used as a major influence on the effects of CSR activity. We argue that the mixed results of the impact of fit regarding the effect of CSR activities is attributed to the influence of connections among brands based on the hierarchy of brands. We then examine the effect of two types of CSR activity strategies that reflect the relativity of fit. The results reveal that there was no difference in impact of the two strategies based on unique roles and traits of corporate brand and effects of low fit. Also, we found that the corporate brand focused strategy creates a greater change in consumers' attitudes than does an individual brand focused strategy in the case of a particular brand. This finding is meaningful because it indicates that a hierarchy of brands may relatively reduce the impact of the role of fit, unlike general arguments from previous related research. Second, the spillover effects from the CSR activities of individual sub-brands belonging to the same corporate brand were confirmed. Therefore, we clearly verified the role of the hierarchy of brands. Although both strategies cause changes in consumer attitude toward brands engaged in CSR activity, overall, a corporate brand focused strategy turned out to be more effective than an individual brand focused strategy because of the spillover effects of brands. Third, this study verified the effect of a corporate brand focused strategy through a moderating effect analysis of the degree of association between individual brands and corporate brand. Given these results, we identified a moderating role in the degree of association and the changes in consumer attitudes toward both main brands engaged in CSR activities and other different individual brands, which were caused by the spillover effects of brands. Finally, this study addresses implications and limitations.

The 'Trojan Horse' of Old Age Income Security System Retrenchment in Korea : the Examination of Policy Changes on Basic Old Age Pension for the Rich (기초연금제도 축소의 '트로이 목마' : 부유층 노인 수급제한조치에 대한 실증적 비판)

  • Kim, Seongwook;Han, Sinwil
    • Korean Journal of Social Welfare
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    • v.66 no.3
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    • pp.231-251
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    • 2014
  • Recently, Korean government documented the plan to cope with the situation related to rich pensioners of Basic old-age pension. The purpose of this paper is to verify that how many rich pensioners are existing and to evaluate government reform plan's validity and effect. Main results are as follows; firstly, if the definition of rich pensioners is on the top 10%, the proportion of them would form 2.9% of total. And then, an amount of expenditure for them is only 2.6% of total. Secondly, in terms of disposable income, debt, and transfer income from child, the household who would be applied by government's plan is not richer than other household who is in the same living standard. And then, if the government's plan enforced, the effect might be very small. Lastly, the plan of government will discriminate against persons who support their parent. As a result, Basic old-age pension will be worsen. This paper should underline that the government's reform is only the 'hidden' retrenchment strategy in order to introduce a standard of the obligation to support own parent in the state without scientific prediction and serious discussion of negative public opinion. That is why, this is the same as the 'Trojan Horse'.

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