• Journal of KIISE:Computing Practices and Letters
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• v.14 no.3
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• pp.306-310
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• 2008

Since the preference for information recommendation service can change according to the context, we should know the user context before providing information recommendation. This paper proposes recommender system that considers multi-user preference in mobile environment and attempted to apply it to restaurant recommendation. To model the preference of individual users in mobile environment, we have used Bayesian network, and restaurant recommendation mostly should consider not an individual user but several users, so this paper has used AHP of multi-criteria decision making process to obtain the preference of several users based on one of individual users. For experiments, we conducted recommendation in 10 different situations, and finally, we confirmed that the proposed system was evaluated as a good one using a usability test of SUS.

• Science of Emotion and Sensibility
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• v.9 no.2
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• pp.101-109
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• 2006

If a salesperson is able to juage consumers' purchasing preferences by looking at their eyebrows shapes, he might be able to set up his sales strategies that will be helpful for the sales. In order to set up this kind of strategy, the difference of purchasing preferences in relation to the eyebrows shapes must be defined clearly. The purpose of this study is to analyze the difference of purchasing preferences according to eyebrows shapes. We group eyebrows shapes into five classes in physiognomy, and Analyze the difference of purchasing preferences according to eyebrows shapes. The result shows that compared with people with rising tails of eyebrows, people with declined ones prefer common, simple, gentle and noble clothing image.

• The Korean Journal of Vision Science
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• v.20 no.4
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• pp.393-401
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• 2018

Purpose : This survey aimed to investigate the differences in shape and color preference of eyeglasses and sunglasses between Korean and Chinese consumers. Methods : The questionnaire was conducted on 150 Chinese students studying in Korea and 150 Korean college students. Any student who majors in optometry was excluded. Chinese students were provided with questionnaires that were translated into Simplified Chinese characters, and it was translated by a native Chinese student studying in a master course of a Korean university, on the basis of Korean questionnaire. Results : The Chinese consumer group preferred the global famous brand in sunglasses rather than the glasses, and it was found that they preferred the Korean glasses products relatively. Also, they presented higher preference to half- or rimless frame, gold color, two-tone colored lens, comparing to the Korean consumer group. Conclusion : The results of this study are expected to contribute to Chinese marketing strategy of Korean manufacturing optical shop companies, and to sales strategy of Korean optical shops with Chinese tourists.

• Journal of The Korean Association For Science Education
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• v.31 no.4
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• pp.491-504
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• 2011

We investigated science-gifted students' conceptions on science learning. The inventory instruments used for our study were a questionnaire on the conceptions of learning science (COLS) and a questionnaire on the approaches to learning science (ALS). Our analysis of the questionnaires showed that there are differences in the conceptions of science learning between the science-gifted and ordinary students. Science-gifted students perceive science learning as storing up of scientific knowledge, expansion of knowledge structure and achievement of a new view. There are no differences in the conceptions of science learning between male and female science-gifted students. There are also no differences in the conceptions of science learning in terms of subject preference such as physics, chemistry, biology and earth science. Our analysis offer assistance to teaching material and teaching method for science courses.

• Science of Emotion and Sensibility
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• v.13 no.1
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• pp.243-250
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• 2010

A study is presented that examines the effect of personality on preference and purchase intention of positive and negative novelty design products. Participants evaluated their preference and purchase intention on 18 design products including positive and negative novelty design products. A cute Scream character was created as a positive novelty design and a skeleton Mickey character was used as a negative one. We measured extroversion, neuroticism, and visual product aesthetics as individual traits. The results shows that people, of course, prefer(and want to buy) the positive novelty design product to the negative novelty design product. Only in the case of the negative novelty design product, the more neurotic people is, the more they prefer it. Also, among the people who like the negative novelty design product, introvert ones are likely to purchase it but extroverted ones are not. These findings imply that personality plays an important role in liking and purchasing negative novelty design product.

• Journal of KIISE
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• v.43 no.10
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• pp.1144-1153
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• 2016

Group recommendation analyzes the characteristics and tendency of a group rather than an individual and provides relevant information for the members of the group. Existing group recommendation methods merely consider the average and frequency of a preference. However, if the users' preferences have large deviations, it is difficult to provide satisfactory results for all users in the group, although the average and frequency values are high. To solve these problems, we propose a method that considers not only the average of a preference but also the deviation. The proposed method provides recommendations with high average values and low deviations for the preference, so it reflects the tendency of all group members better than existing group recommendation methods. Through a comparative experiment, we prove that the proposed method has better performance than existing methods, and verify that it has high performance in groups with a large number of members as well as in small groups.

• Journal of KIISE:Software and Applications
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• v.32 no.6
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• pp.542-553
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• 2005

Recommendation systems analyze user preferences and recommend items to a user by predicting the user's preference for those items. Among various kinds of recommendation methods, collaborative filtering(CF) has been widely used and successfully applied to practical applications. However, collaborative filtering has two inherent problems: data sparseness and the cold-start problems. If there are few known preferences for a user, it is difficult to find many similar users, and therefore the performance of recommendation is degraded. This problem is more serious when a new user is first using the system. In this paper we propose a method of integrating additional feature information of users and items into CF to overcome the difficulties caused by sparseness and improve the accuracy of recommendation. In our method, we first fill in unknown preference values by using the probability distribution of feature values, then generate the top-N recommendations by applying collaborative filtering on the modified data. We call this method of filling unknown preference values as data blurring. Several experimental results that show the effectiveness of the proposed method are also presented.

• Journal of The Korean Association of Information Education
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• v.25 no.3
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• pp.471-481
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• 2021

The purpose of this study is to analyze the effectiveness of AI convergence education program. To this end, the "Elementary Science AI Convergence Education Program for Machine Learning" developed in previous research were taught to elementary school students in the fourth to sixth grades in eight times. The quantitative changes of each factor were analyzed by R program, and the effectiveness of education was analyzed by Pearson correlation and paired samples t-test. As a result, there is a deep correlation between "Attitude to AI technology, Scientific preference and STEAM Literacy" and technical average has improved in many factors. Therefore, AI convergence education program is meaningful in terms of education, and if AI education and AI convergence education are implemented into the primary formal education curriculum, they will have a positive effect.

• Journal of the Korean Chemical Society
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• v.55 no.4
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• pp.703-714
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• 2011

The purpose of this study was to investigate the effect of STS modules reflecting Ansan's geological characteristics in Chemistry I on high school students' science related attitudes and preference for STS lessons. The subjects were 10th grade students from K High School in Ansan and comprised 71 students in the experiment group and 78 students in the control group from 2 classes each. Pretest-posttest control group design was employed for the purpose of research. Four STS modules with lesson plans and teaching materials with themes of water, air, and energy, all of which are closely related to high school Chemistry I were developed and applied to the experiment group. The science related attitudes and preference for STS lessons were then examined in pre- and post-tests. The science related attitudes of the experiment group were significantly high in three out of five domains compared to the control group who was taught traditionally. The preference for STS lessons of the experiment group were highly positive in all five areas and were particularly high in the area of 'relation to society'. Such results imply that in order to make effective high school Chemistry I curriculum units related to STS, emphasized by both the 7th National Curriculum and the Revised 7th National Curriculum, it is necessary to use episodes reflecting local characteristics in which students show greater interest and active participation.

• Science of Emotion and Sensibility
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• v.2 no.2
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• pp.23-30
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• 1999

향은 방향성 또는 휘발성 물질에 의해 코의 점막을 통해 흡입되어 뇌파등의 생체 신호의 변화를 초래하고 풍부한 감성도 유발시킨다. 향은 기억력에 관련된 원시 감정을 유발시킬 뿐만 아니라 생체에서 나오는 페로몬(pheromone)은 행동 양식까지 영향을 미친다. 또한 향을 이용하여 증상의 경감, 예방효과등 질환을 치료하는 aromatherapy는 매우 유망한 분야이다. 본 연구에서는 이러한 페로몬향과 aromatherapy에 사용되는 essential oil등을 이용하여 주관적 감성 평가를 실시하고 이를 통계 분석하여 여러 종류 향들의 자극으로 유발되는 감성의 특징을 밝혀내고자 하였다. 둘째로 향의 선호도를 결정하는데 작용하는 감성요인을 알고자 하였다. 실험에 사용된 향은 26종류이고, 총33명의 지원자가 참여하였다. 설문지는 9점척도의 18문항을 선별하여 4가지 유형으로 작성한 후 유형별로 자료를 정리하여 베리막스의 요인분석, 외귀분석, 군집분석등을 이용하여 분석하였다. 베리막스의 요인분석으로 설문에 사용한 감성 형용사를 쾌한 감성으르 결정하는 요인, 자극의 강도를 결정하는 요인, 이외의 다른 고풍스럽거나 현대적인 요인 등 비슷한 3개 요인으로 나누었다. 향의 선호도를 결정하는데 중요한 감성척도에서는 피검자 성별에 따라 차이가 있음을 보여주었다. 남성의 경우 '황홀하다, 여성적이다' 인데 반해 여성인 경우 '쾌적하다. 친숙하다'라는 감성 척도가 중요하게 작용하였다. 또한 각 향별로 군집을 분류하여 향의 종류를 구분할 수 있었으며 또한 각 향별 선호도를 결정하는 감성 척도도 구해 보았다. 또한 향의 분류에 따른 감성 척도의 특징을 성별로 관찰한 결과 페로몬 향의 경우 essential oil과는 달리 성별에 따른 차이가 나타났다. 결론적으로 후각을 자극하는 향물질로 유발된 감성을 측정해 본 결과 성별에 다라 선호도를 결정하는 감성요인의 차이를 알 수 있었으며, essential oil에서는 성별 차이가 없는데 비하여 페로몬 향의 경우 성별의 차이를 나타내었다.