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Clustering Method based on Genre Interest for Cold-Start Problem in Movie Recommendation (영화 추천 시스템의 초기 사용자 문제를 위한 장르 선호 기반의 클러스터링 기법)

  • You, Tithrottanak;Rosli, Ahmad Nurzid;Ha, Inay;Jo, Geun-Sik
    • Journal of Intelligence and Information Systems
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    • v.19 no.1
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    • pp.57-77
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    • 2013
  • Social media has become one of the most popular media in web and mobile application. In 2011, social networks and blogs are still the top destination of online users, according to a study from Nielsen Company. In their studies, nearly 4 in 5active users visit social network and blog. Social Networks and Blogs sites rule Americans' Internet time, accounting to 23 percent of time spent online. Facebook is the main social network that the U.S internet users spend time more than the other social network services such as Yahoo, Google, AOL Media Network, Twitter, Linked In and so on. In recent trend, most of the companies promote their products in the Facebook by creating the "Facebook Page" that refers to specific product. The "Like" option allows user to subscribed and received updates their interested on from the page. The film makers which produce a lot of films around the world also take part to market and promote their films by exploiting the advantages of using the "Facebook Page". In addition, a great number of streaming service providers allows users to subscribe their service to watch and enjoy movies and TV program. They can instantly watch movies and TV program over the internet to PCs, Macs and TVs. Netflix alone as the world's leading subscription service have more than 30 million streaming members in the United States, Latin America, the United Kingdom and the Nordics. As the matter of facts, a million of movies and TV program with different of genres are offered to the subscriber. In contrast, users need spend a lot time to find the right movies which are related to their interest genre. Recent years there are many researchers who have been propose a method to improve prediction the rating or preference that would give the most related items such as books, music or movies to the garget user or the group of users that have the same interest in the particular items. One of the most popular methods to build recommendation system is traditional Collaborative Filtering (CF). The method compute the similarity of the target user and other users, which then are cluster in the same interest on items according which items that users have been rated. The method then predicts other items from the same group of users to recommend to a group of users. Moreover, There are many items that need to study for suggesting to users such as books, music, movies, news, videos and so on. However, in this paper we only focus on movie as item to recommend to users. In addition, there are many challenges for CF task. Firstly, the "sparsity problem"; it occurs when user information preference is not enough. The recommendation accuracies result is lower compared to the neighbor who composed with a large amount of ratings. The second problem is "cold-start problem"; it occurs whenever new users or items are added into the system, which each has norating or a few rating. For instance, no personalized predictions can be made for a new user without any ratings on the record. In this research we propose a clustering method according to the users' genre interest extracted from social network service (SNS) and user's movies rating information system to solve the "cold-start problem." Our proposed method will clusters the target user together with the other users by combining the user genre interest and the rating information. It is important to realize a huge amount of interesting and useful user's information from Facebook Graph, we can extract information from the "Facebook Page" which "Like" by them. Moreover, we use the Internet Movie Database(IMDb) as the main dataset. The IMDbis online databases that consist of a large amount of information related to movies, TV programs and including actors. This dataset not only used to provide movie information in our Movie Rating Systems, but also as resources to provide movie genre information which extracted from the "Facebook Page". Formerly, the user must login with their Facebook account to login to the Movie Rating System, at the same time our system will collect the genre interest from the "Facebook Page". We conduct many experiments with other methods to see how our method performs and we also compare to the other methods. First, we compared our proposed method in the case of the normal recommendation to see how our system improves the recommendation result. Then we experiment method in case of cold-start problem. Our experiment show that our method is outperform than the other methods. In these two cases of our experimentation, we see that our proposed method produces better result in case both cases.

Convergence Study on Impact of Career Barrier on Seeking Stress of Senior Nursing Students : Mediating Effect of Career Maturity (간호학과 졸업예정자의 진로장벽이 취업스트레스에 미치는 영향에 대한 융합 연구 : 진로성숙도를 매개로)

  • Woo, Sang-Jun;Ha, Yoon-Joo;Kim, Eun-A
    • Journal of Digital Convergence
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    • v.16 no.8
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    • pp.211-219
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    • 2018
  • The purpose of this study was to examine the mediating effects of career maturity on the relation between carrier barriers and senior nursing students's jobs seeking stress. Data analysis was conducted over 208 senior nursing students from three nursing schools in G city and J province. The research methods examined the influence of variables on dependent variable, with difference of carrier maturity. As a result, career barriers had a negative correlation with career maturity but had a positive correlation with jobs seeking stress. Also, career barriers had significant effects on jobs seeking stress(35%, F=109.89, p<.001), mediating effect of career maturity was significant(z=12.24, p<.001). Accordingly, the results indicated that career maturity could buffer the risk of jobs seeking stress of senior nursing student from career barriers. In conclusion, systematic measures are needed to lower career barriers and improve career maturity in order to reduce jobs seeking stress of senior nursing students. It is necessary to develop a strategy to develop career guidance information system that, is specialized in nursing course as well as counselling that utilizes individual ability development, self-esteem management and friend's system.

The proposition of compared and attributably pure confidence in association rule mining (연관 규칙 마이닝에서 비교 기여 순수 신뢰도의 제안)

  • Park, Hee Chang
    • Journal of the Korean Data and Information Science Society
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    • v.24 no.3
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    • pp.523-532
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    • 2013
  • Generally, data mining is the process of analyzing big data from different perspectives and summarizing it into useful information. The most widely used data mining technique is to generate association rules, and it finds the relevance between two items in a huge database. This technique has been used to find the relationship between each set of items based on the interestingness measures such as support, confidence, lift, etc. Among many interestingness measures, confidence is the most frequently used, but it has the drawback that it can not determine the direction of the association. The attributably pure confidence and compared confidence are able to determine the direction of the association, but their ranges are not [-1, +1]. So we can not interpret the degree of association operationally by their values. This paper propose a compared and attributably pure confidence to compensate for this drawback, and then describe some properties for a proposed measure. The comparative studies with confidence, compared confidence, attributably pure confidence, and a proposed measure are shown by numerical example. The results show that the a compared and attributably pure confidence is better than any other confidences.

Analysis of Spike Motion in Male Professional Volleyball foreigner Players (남자 프로배구 용병선수들의 스파이크 동작 분석)

  • Kang, Sang-Hack
    • Korean Journal of Applied Biomechanics
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    • v.19 no.2
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    • pp.359-367
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    • 2009
  • This study was conducted to provide useful information for the scientific training of spikes and instruction, by analyzing all kinematical variants including time, distance, velocity, angle factors in spike movements of volleyball matches. The subjects were 4 foreigner players, who participated in the V-League of 2008-2009. The conclusion from this study is as follows. Time for a jumping step was .33s, and Angelko had a bit longer takeoff time than other players. In Angelko and Anderson who were leading in attack power, the whole distance of a spike motion was relatively short, less than 4m. The moment when the center of gravity reached the lowest point was when the right foot bearing weight in the jumping step was passing the left foot, and the highest point of gravity was 2.30m, which appeared just before the impact. The horizontal speed of the center of the gravity was highest as 4.19m/s at the beginning of a jumping step, and lowest at the stance phase of the fore foot just before takeoff. The vertical speed of the center of the gravity was lowest after the right foot touched the ground, and highest after the takeoff of the fore foot. Impact was 3.22m, and the highest ball speed was 28.18m/s.

Comparison of Liquefaction Probability Map Regarding with Geotechnical Information and Spatial Interpolation Target (공간보간 대상 및 지반정보에 따른 액상화 확률지도 비교)

  • Song, Seongwan;Hwang, Bumsik;Cho, Wanjei
    • Journal of the Korean GEO-environmental Society
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    • v.22 no.11
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    • pp.5-13
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    • 2021
  • The interest of expecting the liquefaction damage is increasing due to the liquefaction in Pohang in 2017. Liquefaction is defined as a phenomenon that the ground can not support the superstructure due to loss of the strength of the ground. As an alternative against this, many studies are being conducted to increase the precision and to compose a liquefaction hazard map for the purpose of identifying the scale of liquefaction damage using the liquefaction potential index (LPI). In this research, in order to analyze the degree of precision with regard to spatial interpolation objects such as LPI value and geotechnical information for LPI determination, liquefaction hazard map were made for the target area. Furthermore, based on the trend of precision, probability value was analyzed using probability maps prepared through qualitative characteristics. Based on the analysis results, the precision of the liquefaction hazard map setting the spatial interpolation object as geotechnical information is higher than that as LPI value. Furthermore, the precision of the liquefaction hazard map does not affect the distribution of the probability value.

Estimation of the Percent of the Vote by Adjustment of Voter Turnout in Election Polls (선거여론조사에서 투표율 반영을 통한 득표율 추정)

  • Kim, Jeonghoon;Han, Sang-Tae;Kang, Hyuncheol
    • Journal of the Korean Data Analysis Society
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    • v.20 no.6
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    • pp.2873-2881
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    • 2018
  • It is very important to obtain objective and credible information through election polls in order to contribute to the correct voting behavior of the voters or to establish appropriate election strategies for candidates or political parties. Therefore, many related organizations such as political parties, media organizations, and research institutions have been making efforts to improve the accuracy of the results of the polls and the election prediction. Kim et al. (2017) analyzed whether the non-response group responded that there is no support candidate in the election survey to increase the accuracy of the estimation of the vote rate. As a result, it has been confirmed that the accuracy of the estimation of the vote rate can be significantly improved by performing an appropriate classification on the non-response layer. In this study, we propose a method to estimate the turnout by each strata (sex, age group) under the condition that the total turnout rate is given for a specific district (region) and propose a procedure to predict the vote rate by reflecting the turnout. In addition, case studies were conducted using data gathered through telephone interviews for the 20th National Assembly elections in 2016.

The Effects of Badminton Club Members' Self-identity and Ego-resilience on Interpersonal Relationship (배드민턴 동호인의 자아정체감 및 자아탄력성이 대인관계에 미치는 영향)

  • Lim, Cheol-Ho;Park, Jong-Jin
    • Journal of the Korea Convergence Society
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    • v.11 no.12
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    • pp.319-327
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    • 2020
  • This purpose of this study was to provide information to contribute to the expansion and development of badminton clubs by identifying the effects of self-identity and self-resilience of badminton club members on interpersonal relationships. Thus, in order to achieve the objectives of this study, 259 badminton club members were verified throught correlation analysis and stepwise multiple regression analysis, which resulted in the following result: First, Among the sub-factors of self-identity, ego-resilience and interpersonal relationships, all of them were statistically relevant, except for a few factors in handling anger management, first-time relationships, self-exposure, and dealing with interpersonal conflicts. Second, Among the sub-factors of interpersonal relationships, the factors affecting the first relationship were interpersonal efficiency, future certainty, intimacy, anger management and subjecthood. The factors affecting the claiming displeasure with others were subjecthood and intimacy. The factors affecting the self-exposure were interpersonal efficiency and subjecthood. The factors affecting the emotional support and advice were subjecthood and optimistic attitude. The factors affecting the dealing with interpersonal conflicts were anger management and confidence. Therefore, the factors of self-identity and self-resilience of badminton club members suggest that they serve as important factors to facilitate interpersonal relationship.

A Study on the Experience of Life in Near Poor Elderly Living Alone in Depression: Phenomenological Study (차상위 계층 우울 독거노인 삶의 경험: 현상학적 연구)

  • Kim, Jae-Eun;Lee, Mi-Hyoung;Lee, Chai-Won;Lee, Sang-Eun;Park, Si-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.12
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    • pp.759-771
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    • 2020
  • The purpose of this study was to explore the meaning of life in near-poor elderly living alone and experiencing depression. We focused on their lived experiences so that we could understand the essential structure of what kind of life they live. The eligible population included those aged 65 or older, showing 9 points or higher in the Korean form of Geriatric Depression Scale (KGDS), currently living alone for more than 1 year, having no problems of communication difficulties, and nationally defined as a near-poor group. A purposive sample of 8 seniors enrolled in s mental health welfare center in Incheon Metropolitan City were recruited. The phenomenological approach suggested by Colaizzi was used. Data was collected from May 2018 to October 2019 through in-depth interviews. As a result of the study, 6 categories, including 48 themes and 19 theme clusters, were drawn from the data: 'a shabby life that cannot live without help', 'a life where the body and mind are sick', 'a life that wants to be self-reliant', 'a life of gratitude', 'a life with inner peace', and 'a life that needed institutional support.' Findings of this study can be evidence for developing suitable emotional support programs for the near-poor elderly living alone and to enact various welfare laws and policies at the national level.

Analysis on Filter Bubble reinforcement of SNS recommendation algorithm identified in the Russia-Ukraine war (러시아-우크라이나 전쟁에서 파악된 SNS 추천알고리즘의 필터버블 강화현상 분석)

  • CHUN, Sang-Hun;CHOI, Seo-Yeon;SHIN, Seong-Joong
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.22 no.3
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    • pp.25-30
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    • 2022
  • This study is a study on the filter bubble reinforcement phenomenon of SNS recommendation algorithm such as YouTube, which is a characteristic of the Russian-Ukraine war (2022), and the victory or defeat factors of the hybrid war. This war is identified as a hybrid war, and the use of New Media based on the SNS recommendation algorithm is emerging as a factor that determines the outcome of the war beyond political leverage. For this reason, the filter bubble phenomenon goes beyond the dictionary meaning of confirmation bias that limits information exposed to viewers. A YouTube video of Ukrainian President Zelensky encouraging protests in Kyiv garnered 7.02 million views, but Putin's speech only 800,000, which is a evidence that his speech was not exposed to the recommendation algorithm. The war of these SNS recommendation algorithms tends to develop into an algorithm war between the US (YouTube, Twitter, Facebook) and China (TikTok) big tech companies. Influenced by US companies, Ukraine is now able to receive international support, and in Russia, under the influence of Chinese companies, Putin's approval rating is over 80%, resulting in conflicting results. Since this algorithmic empowerment is based on the confirmation bias of public opinion by 'filter bubble', the justification that a new guideline setting for this distortion phenomenon should be presented shortly is drawing attention through this Russia-Ukraine war.

The Development and Validation of the Leisure Obsession Scale (여가강박 척도의 개발 및 타당화 연구)

  • Jiyeon Yoon;Seung-Hyuk Choi;Taekyun Hur
    • Korean Journal of Culture and Social Issue
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    • v.19 no.2
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    • pp.235-257
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    • 2013
  • The purpose of this study is to develop the Leisure Obsession Scale and examine the validity of the scale. The Leisure Obsession Scale was developed and identified its validity by exploratory factor analysis, confirmatory factor analysis, and correlation analysis. The Leisure Obsession Scale consists of two factors, which are 'Leisure Preoccupation' and 'Leisure Stereotype'. Those two factors indicated the reasonable fit index by confirmatory factor analysis. In addition, this scale displayed discriminant validity via measurement of obsession, workaholism, leisure anxiety, and leisure constraint. Also, the results of criterion validation analysis shows that the Leisure Obsession Scale and its subscale are correlated with measure of age, leisure information searching, intention of participation to new leisure activities, and intention of increase in leisure time. Conceptualizing leisure obsession and exploring components of leisure obsession would be valuable for understanding the nature of leisure obsession and its effects on leisure satisfaction, and suggesting more effective psychological intervention in a diverse population.

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