• Title/Summary/Keyword: Difference-in-Differences(DID)

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Fashion product purchase criteria, fashion information sources, and attitudes toward eco-friendly and fast fashion products based on consumer innovativeness and nostalgia (소비자 혁신성과 노스탤지어 성향에 따른 패션상품 구매기준, 패션정보원 활용, 패스트 패션상품과 친환경 패션상품에 대한 태도 특성)

  • Seo, Min Jeong;Jun, Dae-Geun
    • Journal of the Korea Fashion and Costume Design Association
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    • v.21 no.2
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    • pp.1-13
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    • 2019
  • The objectives of this study are (1) to classify fashion consumers based on innovativeness and nostalgia and (2) to explore the differences in product purchase criteria, fashion information sources, and attitudes toward eco-friendly and fast fashion products among the identified groups of consumers. A total of 327 respondents were clustered into four distinct groups: (1) high innovativeness and low nostalgia, (2) high innovativeness and high nostalgia, (3) low innovativeness and high nostalgia, and (4) low innovativeness and low nostalgia. The four groups showed significant differences in the purchase criteria of quality, design, and brands and no difference in the criteria of functionality and washing methods. The four groups preferred different sources of fashion information: fashion magazines, people in the street, and salespeople, but did not differ in terms of social networking services (SNS) and in-store displays. While the four groups had significantly different attitudes toward eco-friendly fashion products, they did not show differences in attitudes toward fast fashion products, excluding usefulness. These meaningful results provide guidelines for developing more effective merchandising strategies for both eco-friendly and fast fashion products.

Investigating the Influence of a Food-themed TV Program on Delivery Food Order Amount Using Big Data with Difference-in-Differences Method (빅 데이터를 이용한 음식방송의 효과 확인: 이중차이분석을 적용하여)

  • Park, Jihye;Park, Jaehong
    • Information Systems Review
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    • v.18 no.1
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    • pp.25-39
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    • 2016
  • This study suggests a case for people who are unfamiliar with data analysis to equip them in using big data easily without complex programming tasks. Consequently, we investigate whether a food-themed TV program influences the number of delivery food orders with the use of the difference-in-differences method. Results show that the number of delivery food orders significantly increased after broadcasting four of five food-themed TV program episodes, each of which focuses on a particular delivery food. This study contributes to the existing literature by presenting the possibility that food-themed TV programs can positively affect not only the broadcast delivery food stores but also the entire delivery food business. In addition, this study provides practical contributions by recommending a big data analysis methodology that can be easily employed by many people.

Criteria for clinical translucency evaluation of direct esthetic restorative materials

  • Lee, Yong-Keun
    • Restorative Dentistry and Endodontics
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    • v.41 no.3
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    • pp.159-166
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    • 2016
  • The purpose of this review was to suggest practical criteria for the clinical translucency evaluation of direct esthetic restorative materials, and to review the translucency with these criteria. For the evaluation of reported translucency values, measuring instrument and method, specimen thickness, background color, and illumination should be scrutinized. Translucency parameter (TP) of 15 to 19 could be regarded as the translucency of 1 mm thick human enamel. Visual perceptibility threshold for translucency difference in contrast ratio (${\Delta}CR$) of 0.07 could be transformed into ${\Delta}TP$ value of 2. Translucency differences between direct and indirect resin composites were perceivable (${\Delta}TP>2$). Universal and corresponding flowable resin composites did not show perceivable translucency differences in most products. Translucency differed significantly by the product within each shade group, and by the shade group within each product. Translucency of human enamel and perceptibility threshold for translucency difference may be used as criteria for the clinical evaluation of translucency of esthetic restorative materials.

Assessing Korean Middle School Students' Spatial Ability: The Relationship with Mathematics, Gender, and Grade

  • Park, Sung Sun;Yoon, So Yoon
    • Research in Mathematical Education
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    • v.16 no.2
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    • pp.91-106
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    • 2012
  • Spatial ability has been valued as a talent domain and important skill in mathematics education because it enhanced an intuitive view and an understanding in many areas of mathematic. In addition, spatial ability highly correlates with mathematics achievement, indicating its crucial role in success in mathematics education. Some researchers founded gender differences in mathematics and spatial ability, and indicated that spatial ability served as a mediator of gender difference in mathematics. This study explored the spatial ability of 349 Korean middle school students (Grade 7-9), and investigated the association among students' spatial ability and their mathematics achievement, gender, and grade. The result of this study shows that spatial ability correlates positively with mathematics achievement. While gender difference did not exist in mathematics, significant gender difference existed in spatial ability favoring male students.

A Comparative Study of Consumption Propensity and Determinants of Purchasing According to Cultural Differences between Baby Boomers and Millennials: Application to Franchise Customers

  • Roh, Hyun-Sik;Lee, Sung-Ho;Kim, Sung-Hoon
    • The Korean Journal of Franchise Management
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    • v.11 no.1
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    • pp.31-44
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    • 2020
  • Purpose: The baby boomers and the millennials, who make up the largest share of the market, are showing the gap in their differentiated cultural styles. The purpose of this study is to study the consumption propensity and purchasing determinants of the baby boomers generation and the millennials generation, which have become a very important key pillar in shaping the market based on the cultural dimension model theory of h(=>H)opstead, and to identify the difference Research design, data, and methodology: In order to verify the research hypotheses, The data was collected from the baby boomers and the millennials using online questionnaires. The pre-test was conducted from October 10 to 12, 2019, and the main survey was conducted from October 15 to 25. A total of 230 copies were recalled, and the final 219 copies were used for the final analysis. Results: The consumption propensity between the baby boomers and the millennials differed in resource saving purchase propensity and impulse buying propensity. The baby boomers showed higher resource saving purchase propensity than the millennials, while the millennials showed higher impulse buying propensity. There was a difference in the determinants to purchasing only in the evaluation factor. Results of gender differences by generation, baby boomers differed in their planned purchase propensity, and women were higher. The millennials generation differed in resource saving purchase propensity and awareness propensity for others, all higher in men. In determinants to purchasing, the baby boomers did not differ in gender, and the millennials did differ in product factors. A canonical correlations analysis of the relationship between the baby boomers and the millennials showed a significant relationship between consumption propensity and determinants to purchasing. Also, the baby boomer generation has the biggest link between impulse buying propensity and evaluation factor. The millennials generation showed the biggest link between resource saving purchase and product factors. Conclusions: This study compared consumption propensity and determinants to purchasing of baby boomers and millennials on the basis of Hopstead's cultural dimension model theory to identify differences between generations, presenting practical and theoretical implications for establishing a correct understanding and specific marketing strategy among generation.

Comparative Health Extents of Korean Rockfish, Sebastes Schlegeli by the Commercial extruded Pellet and Moisture Pellet Administration (해상가두리 양식장에서 배합사료 및 생사료 투여에 의한 조피볼락, Sebastes schlegeli 건강도)

  • Choi, Hye-Sung;Huh, Min-Do;Son, Maeng-Hyun;Kim, Kang-Woong;Kim, Kyoung-Duck
    • Journal of Fisheries and Marine Sciences Education
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    • v.25 no.6
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    • pp.1315-1323
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    • 2013
  • The purpose of this research is to evaluate the effects of a commercial mixed extruded pellet(EP) and raw fish moist pellet(MP) diet on diseases prevalence and serological constituents and HSI of korean rockfish, Sebastes schlegeli grown in two commercial-scale aquaculture farms from June to December in 2009. The growth of MP-fed rockfish was slightly faster than EP-fed rockfish during experimental period, but did not show significant differences. The levels of TCHO, TG, Glucose and TP in the MP-fed rockfish group were higher than those of EP-fed group, whereas there was no significant difference in other biochemical factors of blood between two groups. In addition, bacteria and virus were not detected in both MP- and EP-fed rockfish groups, and the infection rates of gill fluke between two groups did not show clear difference. In conclusion, there was no comparable difference in growth and the health extents of one year rockfish by administration of the commercial mixed extruded pellet(EP) and raw fish moist pellet(MP) diets.

Comparison of Critical Thinking and Professionalism between Korean and Chinese Nursing Students (한국과 중국의 간호대학생들의 비판적 사고성향과 전문직관 비교연구)

  • Lee, H.Y.;Kim, Y.H.;Kang, H.S.;Lee, J.;Fan, X.;Ling, M.;Yuan, Q.
    • Journal of East-West Nursing Research
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    • v.13 no.2
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    • pp.179-186
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    • 2007
  • Purpose: The aim of this study was to examine the differences in critical thinking and professionalism between Korean and Chinese nursing students. Critical thinking and professionalism were a part of five domains to evaluate nursing education: critical thinking, professionalism, leadership, communication, and nursing practice from the Korean Accreditation Board of Nursing. Methods: Data were collected from 207 college nursing students: 104 students from the 4-year degree program in Korea and 103 from the 5-year degree program in China from September 2006 to September 2007. The instruments for Chinese students were translated in Chinese and re-translated to check accuracy. The data were analyzed by using the SPSS/PC+ Win 12.0 Version. The $x^2$-test to compare general characteristics and the t-test to examine the differences of the study variables were conducted. Results: Korean nursing students reported significantly higher scores of critical thinking than did Chinese students while Chinese students reported significantly higher scores of professionalism. Students took previous courses associated with critical thinking reported significantly higher scores than did those without previous courses taken. There was no significant difference in scores of professionalism whether students had previous experience of related courses or not. Rather than, students with clinical practice reported higher scores of professionalism than did those without clinical practice. Conclusion: Levels of critical thinking were influenced by course focusing on critical thinking while professionalism was improved by combination of associated courses and clinical practice. For follow-up study, there is needed to examine nursing curriculum between Korea and China.

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A Predictive Model for Sensory Difference Tests Accounting for Sequence Effects

  • Lee, Hye-Seong
    • Food Science and Biotechnology
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    • v.17 no.5
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    • pp.1052-1059
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    • 2008
  • Sequential Sensitivity Analysis (SSA) and conditional stimulus model have been developed to describe sequence effects in difference tests and proposed to generate prediction of differences in sensitivity between various test protocols and to assist the appropriate selection of difference test. Yet, such models did not furnish a complete explanation of the relative sensitivity in 4 different versions of 3-alternative forced choice (AFC) tests where various interstimulus rinses were introduced. In the present study, the vector of the contrasts between various conditional stimuli were measured using same-different and 2-AFC and a new 16-distribution conditional stimulus model was developed by refining Lee and O'Mahony's contrast model. This new model gave superior predictions than previous models.

The Effect of a Six-Week Sling Exercise on Flexibility, Balance, Muscular Strength, Pelvic Tilt Angle in Age of 20 Woman Low Back Pain (20대 여성 요통환자의 6주간 슬링운동이 유연성, 균형, 근력 및 골반경사각에 미치는 영향)

  • Seo, Dungyeol;Lee, Youngsin;Lee, Dongjin;Kim, Sangyeop
    • Journal of The Korean Society of Integrative Medicine
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    • v.1 no.2
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    • pp.1-12
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    • 2013
  • Purpose : The purpose of this study was to evaluate the effect of 6 weeks of sling exercises on female patients 20 years of age with low back pain according to flexibility, balance, muscle strength and pelvic tilt. Method : The 20 female patients who complained of back pain were divided into two groups. The experimental group exercised for 40 minutes, 3 times a week for 6 weeks. The control group did not. Both groups were measure for flexibility, balance, muscular strength, and pelvic tilt angle. Result : Curvature of the experimental flexibility, stretch, balance, muscle strength of the trunk forward, backward, left rotation, right rotation for the sling exercise group had significant differences. However, pelvic tilt did not show a significant difference. Control of the stretch of the flexibility, balance, and muscle strength of the trunk posterior showed significant differences for the sling exercise group. Conclusion : Although significant differences were found in flexibility, balance, muscular strength, there was no difference in pelvic tilt. When selecting subjects, we believe patients with regular patterns of pain will be more effective for statistical analysis of the changes in pelvic tilt.

Quality Characteristics of Muffins Containing Domestic Dropwort Powder (Oenanthe stolonifera DC.) (국내산 미나리 가루 첨가량에 따른 머핀의 품질 특성)

  • Seo, Eun-Ok;Kim, Kwang-Oh;Ko, Seong-Hye
    • Journal of the East Asian Society of Dietary Life
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    • v.21 no.3
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    • pp.338-344
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    • 2011
  • In this study, muffins were produced using dropwort powder and to the quality characteristics such as volume, height and moisture content The results showed that the height of the muffin was 5 cm and there were no significant differences across samples (p<0.05). The volume of the muffin increased as the amount of dropwort powder increased. With respect to the moisture content, a comparison group showed a moisture content of 26%, and the 3%-added and the 6%-added groups did not show any significant difference. The 9%-added group, however, did show a significant difference (p<0.05). The results of texture measurements showed that hardness increased as the amount of added dropwort powder increased. There were also significant differences in adhesiveness and springing across samples (p<0.05). With respect to cohesiveness, gumminess and chewiness, these characteristics tended to increase as the amount of added dropwort powder increased, and there were significant differences across samples (p<0.05). Sensory test results of added showed that the 3%-added group scored the highest for color, flavor and taste. For texture, the 6%-added group showed a value of 6.2, which was the highest texture. In terms of the overall acceptability, the 3% dropwort powder group showed a score of 7.2, which was the highest acceptability. These results suggest that the 3%-added group was the most desirable and appropriate.