• 경영정보학연구
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• 제9권1호
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• pp.85-103
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• 2007

본 연구의 목적은 좀 더 정확한 고객 선호도 예측을 위한 협업 필터링 알고리즘의 예측 성능을 평가하기 위한 것이다. 고객 선호도 예측의 정확도를 비교하기 위하여 이웃 기반의 협업 필터링 알고리즘과 대응평균 알고리즘에 의한 고객 선호도 예측의 MAE를 비교하였다. 예측 알고리즘의 정확성을 분석하기 위하여 MovieLens 1 Million dataset을 이용하여 실험을 하였다. 각 예측 알고리즘에 사용된 유사도 가중치는 일반적으로 이용되는 피어슨 상관계수와 벡터 유사도를 이용하였으며 분석결과 대응평균 알고리즘의 예측 정확도가 이웃 기반의 협업 필터링 알고리즘의 예측 정확도 보다 우수한 것으로 나타났다. 두 알고리즘에 사용된 유사도 가중치인 피어슨 상관계수와 벡터 유사도는 두 고객이 특정 상품에 대하여 공통으로 평가한 선호도 평가치를 이용하여 계산된다. 이때 공통으로 평가한 선호도 평가치의 개수가 적으면 계산된 유사도 가중치가 과대 평가된다. 과대 평가된 유사도 가중치를 보정하여 고객 선호도 예측의 정확도를 높이기 위하여 기존의 연구에서 고려한 공통 평가 영화의 개수 보다 확대된 범위를 적용하였으며 각 예측 방법에 따라 서로 다른 개선 경향을 파악할 수 있었다.

• 한국의류학회지
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• 제23권4호
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• pp.541-550
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• 1999

The purpose of this study is to find out the factors that explain the sense of touch and preference of man-made leather. Date base of descriptors for man-made leather was collected by interviewing 50 consumers, 33 different kinds of commercial man-made leathers(synthetic leather and artificial leather) were assessed subjectively by 605 consumers using the 9-point scale of 34 pairs of bipolar descriptors based on the data base. Subjective ratings were analyzed by principal axis factoring with varimax rota-tion. The sense of touch of man-made leather is explained by five factors ; surface property stretchiness thickness& weight thermal property(warmth & coolness) and moisture property (sticky & clingy). The difference in the sense of touch of man-made leathers is mainly attributable to surface property and stretchiness. And the preference of man-made leathers is mainly attributable to surface property and stretchiness. And the preference of man-made leather is explained by three factors ; surface property stretchiness and quality. Higher preference is found in man-mad leather of better quality touch and softness.

• Journal of information and communication convergence engineering
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• 제17권2호
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• pp.135-141
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• 2019

Collaborative filtering algorithms often encounter data sparsity issues. To overcome this issue, auxiliary information of relevant items is analyzed and an item attribute matrix is derived. In this study, we combine the user-item attribute preference with the traditional similarity calculation method to develop an improved similarity calculation approach and use weights to control the importance of these two elements. A collaborative filtering algorithm based on user-item attribute preference is proposed. The experimental results show that the performance of the recommender system is the most optimal when the weight of traditional similarity is equal to that of user-item attribute preference similarity. Although the rating-matrix is sparse, better recommendation results can be obtained by adding a suitable proportion of user-item attribute preference similarity. Moreover, the mean absolute error of the proposed approach is less than that of two traditional collaborative filtering algorithms.

• 한국의류학회지
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• 제21권8호
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• pp.1334-1345
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• 1997

The purpose of this study were 1) to identify the effects of age and sex of Korean adolescents on the psychological variables(body attitudes, public/private self-consciousness, self-esteem), weight control practices, and clothing behaviors, and 2) to identify the relation- ships between psychological variables and weight control practices, and the effects of the variables on clothing behaviors in the adolescent' groups classified by sex and age. The results of this study were as follows: 1) Two factors of body attitudes were identified: Body-shape consciousness and Physical attractiveness. Four factors of clothing attitudes were identified: Clothing interest/dressing for others, Clothing exhibition, Dressing for self, and Psychological clothing-dependerlce. 2) There were significant effects of sex on all of the research variables. Age was found to have effects on Physical attractiveness, self-esteem, public/private self-consciousness, Clothing exhibition, and Psychological clothing- dependence. 3) In the relationships between psychological variables and weight control practices, Body-shape consciousness was negatively correlated with Physical attractiveness in all groups. Also, Body-shape consciousness had effects on weight control practice in all subject groups. 4) Public self-consciousness had direct/indirect effects on the Clothing interest/dressing for others in all subject groups. Private self-consciousness had direct/ indirect effects on dressing for self in high school boys and girls. Body-shape consciousness had indirect effects on Preference for up-to date style in male college students group, whereas weight control practices had effects on the Preference for up-to date style in female college students group. Self-esteem was found to have the effects on clothing behavior in college students groups. Among clothing attitude factors, Clothing exhibition had distinct effects on the Preference for up-to date style in all subject groups, and Clothing interest/dressing for others had effects on Clothing exhibition and Psychological clothing-dependence in high school boys and girs.

• 동아시아식생활학회지
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• 제9권1호
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• pp.35-45
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• 1999

This study was conducted to investigate mean height, weight, food preference and satisfaction of 231 children in preschool in four different regions(Susung-ku, Jung-ku, Nam-ku, Dalseo-ku) of Taegu. Mean height of the children was increased by priority of Jung-ku, Dalseo-ku, Susung-ku and Nam-ku, and mean weight was of Jung-ku, Susung-ku, Dalseo-ku and Nam-ku. In food preference, boiled rice had the highest score of cooked rices in all of the different regions, jajangmyun had the highest score of noodles in Susung-ku, Jung-ku and Dalseo-ku. Cake had the hightest score of breads in Susung-ku and had significantly difference all the kind of other lesions. Songpyun had the highest score of rice cakes in all four regions. Jangjorim had the highest score of jorim foods in all four regions, but anchovy and green pepper jorim had the lowest. Toasted lavor and steamed chicken had the highest of toasted foods and steamed foods, respectively. Salads had the highest of muchimryu cooked potherbs and salads in all regions but kimchi and jangachi had low scores. Sujungkua had the lowest scores of beverages in all regions, but chocolate had the highest scores of cookies. In food intake satisfaction according to the regions, regularity, variety, hygiene, amount, and quantity of meal had the highest in dalseo-ku. Food temperature was highest in susung-ku. There was a direct correlation between type of housing and satisfaction in diversity of foods.

• 대한영양사협회학술지
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• 제8권4호
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• pp.342-358
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• 2002

The purpose of this study was to investigate differences of food preference and nutrient intake of students between elementary school and middle school in the same area and to provide data for better school food service. The subjects were 486 students, third to sixth grade of 3 elementary schools and first to second grade of 1 middle school in Nam jeju gun, Jeju, and the survey was conducted during June 1999. Food preference was assessed using questionnaires and 24-hour food intake was assessed using dietary record method. Data of weight and height were obtained from annual physical examination conducted at schools in May 1999. All the variables were compared among 3 groups in each gender: third and fourth grade elementary school(ES3,4), fifth and sixth grade elementary school(ES5,6), and first and second grade middle school(MS1,2). The results were summarized as follows. The average height, weight and BMI for the 3th grade boys in elementary schools met the national averages, but those of the others are below the national averages. Although general pattern of food preference looked similar among groups, food preference scores were significantly different among groups in 38 kinds foods for boys, and 27 kinds of foods for girls. MS1,2 group showed significantly lower food preference scores for most of foods as compared to those of ES3,4 and ES5,6 in both genders. Students of higher grade took more starch foods such as instant noodle, stewed rice cake and snacks. Average energy intakes of all the groups except MS1,2 girls were lower than recommended dietary allowances(RDA), and average intakes of protein, vitamins B1 and C met RDA, but the other nutrients were taken less than RDA and especially the intakes of iron, calcium and vitamins B2 were poor. Most of nutrients taken by school food service meal provided a major proportion of intakes. In conclusion, students of middle school were more particular about their foods served at school food service and marked lower food preference score than elementary school children and more conscious about their weight and appearance. These points should be reflected in planning food service menu at middle school.

• 한국식품영양과학회지
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• 제27권5호
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• pp.1007-1014
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• 1998

A questionnaire was administered to 850 middle school students in Jinju city and Hamyang province to asses their body shape preferences. Their mean current BMI(body mass index, Kg/㎡) in males(19.23±2.77) was higher than that in females(18.61±2.59). On the other hand, significant differences in BMI were not found between areas. The perceived desired weights for their current height were about+0.22kg(males) and -4.32kg(females) of their actual weights. In spite of the average weight group, many wished to lose weight because of their tendency to perceive themselves as overweight, especially among rural females. Their ideal body shape as perceived by them were 'normal' in males and 'a bit thin' in females, independent of the areas. As for the 'contentment' regarding their current weight and health, the most satisfied group in males were estimated average weight and slightly overweight group, respectively. While, the most satisfied group in females were estimated slightly underweight and overweight group, respectively. Their extreme slim-body preference might have its root in the lack of proper understanding of what the 'standard' body weight was.

• 한국학교보건학회지
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• 제8권1호
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• pp.155-166
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• 1995

The aim of this study was to determine the extent to which sociodemographic and health related life-style variables explain body weight distribution and to understand weight contol behavior. To study this study 298 students were selected, it was consisted of obesity group(101) and control group(197). The average age of subjects was 14.2 and the prevalence of obesity was 2-3 per class as 5.6% among 1,793. 71% among same subject was showed higher weight pattern than last one year, ovesity group which was obesity both in 93 and 94 was 34%. Correlation between body weight(under weight/obesity) and independent variables including sociodemographic factor and health- related life style tested through Multiple Classification Analysis was very significant, explained 36% of the total variance. Sociodemografic and hereditary factors such as education level, age of father and physical features of parents, life style factors as exercise preference and perceived health status showed highly contribution to body weight. Concretely, there were showed a higher obesity prevalence tendency when education level and age of father was high, physical features of parents was obesity. In otherwise, there were showed a higher underweight prevalence tendency when education level and age of father was low. Experience rates of weight control was 53% generally, 84% in obesity group, and 11% in underweight group. There were utilized weight control behaviors through diet method mainly in obesity group, diet and exercise methods in underweight group. There were showed that underweight group are prefer exercise to obesity group. Conclusionally, These findings suggest that education, age, physical features of parents, exercise preference and perceived health status is important factors related to body weight among middle school girls. Therefore, there will be considered as valuable factors when we practice health education and consultation related to body weight. Furthermore it is necessary to provide of various informations about weight control and to develop systematic weight control program.

• 한국식품영양학회지
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• 제28권4호
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• pp.658-665
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• 2015

This study was conducted to provide desirable way on the eating of sugar foods, specifically the differences between dietary attitude, dietary behaviors and intake frequency. Data was collected from 279 middle students in the Incheon region through a self-administered questionnaire. According to the results of the reliability and factor analysis, the dietary attitude, dietary behaviors and intake frequency was 3.52, 2.89 and 2.51, with a Cronbach alpha coefficient of 0.867, 0.789, 0.940 and KMO of 0.899. Factor analysis extracted three components of the sugar preference, which we named dietary attitude (factor 1), dietary behaviors (factor 2), and intake frequency (factor 3). The dietary attitude and dietary behaviors showed a significant difference between sugar preference and non-preference (p < 0.05). Also, intake frequency of sugar food showed a significant differences in chocolate, chocolate products, and ice cream between sugar preference and non-preference (p < 0.05), whereas no significant differences were found in cake, bread kinds, juice, sweetness milk, yogurt between sugar preference and non-preference (p > 0.05). A significant positive result of intake frequency of sugar food (p < 0.05) was shown for the dietary attitude, BMI, weight, and monthly pocket money. Based on this study, the reduction of sugar intake is needed especially for middle students.

• 한국지능시스템학회논문지
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• 제15권4호
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• pp.443-450
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• 2005

본 논문에서는 웹 사용자의 선호도를 추출하기 위한 지능적 모델을 제안하고 이에 대한 평가결과를 제시한다. 이를 위해 현재 정보검색엔진의 문제점을 분석하고, 선호도 가중치를 학습기에 반영한다. 이것은 키워드에 의한 단어별 빈도수에 의존하지 않고 지능적으로 사용자의 행동유형을 학습하게 함으로써 질의에 대한 결과집합을 사용자의 의도에 맞게 제공하는 메커니즘이다. 다음으로 선호도 유행성에 대한 개념과 고려요소를 제안하며, 선호도 추출 알고리즘과 이에 대한 예를 제시한다. 또한 행동유형 추출을 위한 지능모델을 설계하고 HTML 색인과 선호도 결정 지능학습과정을 제안한다. 마지막으로 선호도를 적용한 후의 문서 랭킹 측정결과를 비교함으로써 본 논문에서 제안한 모델의 타당성을 검증한다.