The objectives of the study were to examine food waste generation and reduction efforts at home, and to identify factors affecting the intention to reduce food waste. A total of 3,321 food buyer responses were used from the 2022 Consumer Behavior Survey for Food of the Korea Rural Economic Institute. Statistical methods for a complex sample were applied by using a SPSS program (ver. 26.0). The average daily food waste generation per household significantly differed by the main food purchaser’s age and household size. Plate waste and food waste from preparation were the main types of food waste. A multiple regression analysis revealed that intention to reduce food waste was influenced by the main types of food waste, the average daily amount of food waste, the perceived amount of food waste, and the perceived importance of food waste reduction after adjusting for the age of the main food purchaser and household size. Since the amount of food waste was affected by a series of food behaviors as well as consumer’s intention to reduce waste, empirical research on the types and amounts of food waste generated in Korean households and qualitative research on behaviors and attitude affecting food waste are needed.

This study examined the intake status and the factors affecting intake of functional foods using the data from Consumer Behavior Survey for Food by the Korea Rural Economic Institute. Among the total respondents, 80.4% took functional foods, and the number of respondents who took two types of functional foods was the highest. The main reason for taking functional foods was to prevent disease, and the main places of purchase of functional foods were off-line large supermarkets, on-line shopping malls, and pharmacies. Compared to a year ago, the percentage of increase in functional food purchases this year was higher than the percentage of decrease. The most common reasons for not taking functional foods were ‘not feeling the need’ and ‘not trusting the quality’. As a result of conducting a complex samples logistic regression analysis to identify the factors affecting the intake of functional foods, gender, age, marital status, illness state, alcohol drinking, and convenience-seeking type among dietary lifestyles were significant.

This study aimed to examine relationships of water and dietary fiber intake with various health-related factors using data from the 2016~2019 Korea National Health and Nutrition Examination Survey (KNHANES). A total of 8,419 adults aged 19~49 years were categorized into four groups: (1) sufficient intake of both water and fiber (Type 1) (n=2,235), (2) water deficiency with sufficient fiber (Type 2) (n=1,470), (3) fiber deficiency with sufficient water (Type 3) (n=1,031), and (4) deficiency in both water and fiber (Type 4) (n=3,683). General characteristics, body composition, health behaviors, dietary habits, nutrient and food intake, and dietary quality were compared. Type 4 had more female (p=0.028), older adults (p<0.001), and higher socioeconomic status (p<0.001) than Type 1. Type 1 consumed breakfast more frequently (p<0.001). Nutrition label recognition, usage of nutrition label, and all nutrient intakes were the highest in Type 1 but the lowest in Type 4. Type 1 also had better dietary variety score and nutritional quality. These findings highlight the importance of adequate water and fiber intake for balanced nutrition and suggest that targeted nutrition education is needed, especially for male and low-income groups with insufficient intake.

This study examined differences in breakfast habits, mental health, and the prevalence of allergic diseases among 9,549 adolescents from father-headed and mother-headed families, using raw data from the 2017~2019 Korea Youth Risk Behavior Web-Based Survey. Of the total participants, 44.6% came from father-headed families, while 55.4% were from mother-headed families. Single-parent adolescents showed the highest likelihood of eating breakfast every day of the week (24.5%), but they also had a significant tendency to skip breakfast entirely (24.3%). There was no significant difference in breakfast frequency between those from father-headed and mother-headed families. The perception of stress and subjective health status did not differ significantly between adolescents from the two types of families, although subjective health status did show significant differences among boys. Depressive experiences were notably higher in adolescents from mother-headed families (33.0%) compared to those from father-headed families (30.8%). Additionally, the prevalence of atopic dermatitis and allergic rhinitis was significantly greater in adolescents from mother-headed families (24.2% and 32.1%, respectively) than in those from father-headed families (21.1% and 26.5%, respectively). These results indicate the need for tailored nutrition and health guidance programs for adolescents from single-parent families to support the role of the absent parent.

This study aimed to compare food procurement and dietary behavior of single-person households in Korea. A total of 949 single-person households that participated in the 2022 Food Consumption Behavior Survey were divided into three age groups: 20~39 years (n=204), 40~59 years (n=317), and 60~74 years (n=428). Monthly expenditure on eating out was similar for the 20~39 and 40~59 age groups at around 145,000 KRW, while the 60~74 age group spent 79,823 KRW (p<0.001). The frequency of eating out was the highest at 2~3 days per week for the 20~39 age group, with take-out occurring 1 day per week (p<0.01). Regarding online food purchases, 35% of the 20~39 age group bought food online once every two weeks, whereas 40~59 and 60~74 age groups had higher percentages of those buying non-online food (44.7% and 89.0%, respectively, p<0.001). Regarding dietary competency index, healthy eating scores were the highest in the 60~74 age group (p<0.01). As the dietary competency index increased, monthly expenditure on take-out decreased for the 40~59 age group while satisfaction with current diet increased across all age groups (p<0.01). This study is expected to be helpful for developing nutrition education materials tailored to different life stages.

This study compared the dietary perceptions, food labeling behaviors, and purchasing patterns of vegetarians and nonvegetarians. The data from 5,811 adults aged ≥19 years who participated in the 2023 Consumer Behavior Survey for Food were analyzed. The participants were divided into vegetarians and non-vegetarians according to their dietary practices. Vegetarians were further divided into strict, semi, and occasional vegetarians. Non-vegetarians regularly consumed plantand animal-based foods without dietary restrictions. Vegetarians comprised 15.4% of the participants, and health (50.4%) was the primary motivation for adopting a vegetarian lifestyle. Compared to non-vegetarians, vegetarians prioritized their rights and responsibilities as citizens and identified a vegetable-centered diet as the most crucial factor for health. Vegetarians showed greater interest and trust in food labeling than non-vegetarians. Vegetarians selected a wider variety of food and had different purchasing motivations when purchasing eco-friendly foods than non-vegetarians. Vegetarians exhibited higher purchase frequencies across all categories than non-vegetarians and had different reasons for purchasing convenience foods. These findings highlight the diversity of vegetarian dietary motivations and behaviors, emphasizing the need for tailored dietary policies and education.

본 연구는 자기결정성이론과 계획행동이론의 통합모델을 기반으로 미 술관 관람객의 기본심리욕구가 행동의도에 미치는 영향에서 행동구성개 념의 매개효과를 확인하여 행동을 예측하는 모형을 탐색하고자 하였다. 이를 위해 2024년 6월 18일부터 7월 7일까지 설문조사를 실시하여 총 273명의 응답 자료를 구조방정식 모형 분석하였다. 주요 연구결과는 다 음과 같다. 첫째, 모든 변인은 행동의도에 정적 상관을 보였다. 둘째, 기 본심리욕구와 행동의도 간의 관계에서 행동구성개념은 완전 매개효과를 보였다. 셋째, 기본심리욕구는 행동의도에 직접적인 유의미한 영향을 미 치지 못했다. 이러한 결과는 관람객의 재관람의도나 구전의도 등의 패턴 을 이해함으로써 미술관 운영 활성화를 위한 방안을 모색할 수 있다는 점에서 연구의 의의를 둔다.

본 연구는 대기업, 중견기업, 중소기업의 상사 코칭리더십이 부하 직원의 직 무성과에 미치는 영향에서, 부하 직원의 혁신행동이 직무성과에 미치는 매개효 과를 확인하고자 하였다. 이를 통해 후속 연구에서 활용할 기초 자료를 제공하 는 것이 목적이다. 이를 위해 국내 직장인 324명의 자료를 수집하였다. 연구 결과, 첫째, 상사의 코칭리더십이 부하 직원의 혁신행동과 직무성과 모 두에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 상사의 코칭리더십이 부 하 직원의 혁신행동을 매개하여 부하 직원의 직무성과에 영향을 미치는 것으로 확인되었다. 이러한 결과는 코칭리더십이 직무성과에 미치는 경로에서 혁신행 동이 매개 역할을 수행하며, 대기업뿐만 아니라 중견기업과 종소기업에서도 코 칭리더십의 영향이 유사하게 작용함을 시사한다. 본 연구를 바탕으로 향후 대기 업에 비해 조직의 시스템이 상대적으로 열악한 중견기업과 중소기업에 근무하 는 상사의 코칭리더십에 대한 후속 연구가 이어지기를 기대한다.

Reinforced concrete (RC) moment frames are widely used to resist lateral loads associated with wind and earthquakes. However, most older RC moment frames performed poorly against past earthquakes. In moment frames, beam-column connections play a crucial role in system performance. Among the connections, corner connections are more vulnerable because they are restrained by only two beams and are affected most strongly by bidirectional loading. High-performance fiber-reinforced cementitious composites (HPFRCC) were used in previous studies to improve the seismic performance of older beam-column connections. This study aims to evaluate the level of improvement of seismic behavior of older beam-column connections under bidirectional loading after retrofitted with HPFRCC by comparing the seismic behavior of the HPFRCC connections to beam-column connections used in intermediate (IMF) and special moment frames (SMF). Test results revealed that the seismic behavior of the HPFRCC connections was almost close to that of SMF connections.

Background: The increasing demand for real-time professional fitness coaching has led to a need for accurate exercise posture recognition using artificial intelligence. Objectives: To compare the performance of Feedforward Neural Network (FNN) and Stacked Long Short-Term Memory (LSTM) models in classifying fitness posture images using detailed joint coordinate labeling. Design: Comparative analysis of machine learning models using a labeled dataset of fitness posture images. Methods: A dataset from AI-hub containing images and data of 41 exercises was used. Five exercises were selected and processed using a custom program. Data was converted from JSON to CSV format, augmented with joint condition information, and analyzed using Google Colab. Results: The best FNN model achieved a training error of 1.21% and test error of 9.08%. The Stacked LSTM model demonstrated superior performance with a training error of 1.05% and test error of 6.09%. Conclusion: Both FNN and Stacked LSTM models effectively classified sequential fitness images, with Stacked LSTM showing superior performance. This indicates the potential of Stacked LSTM models for accurate fitness posture classification in real-time coaching scenarios.

This study aims to identify factors influencing clothing consumption behavior among college students, focusing on body image perception and self-esteem. Data were collected from 207 students at two universities in Jinju city, using a structured questionnaire from July 1 to August 20, 2024. The data were analyzed using descriptive statistics, t-tests, ANOVA, Pearson’s correlation coefficient, and multiple regression analysis with SPSS 23. The study found moderate levels of body image perception, self-esteem, and clothing consumption among the college students. A negative correlation was found between body image perception and self-esteem r=–.372, p=<.001). The regression model for factors influencing clothing consumption behavior was significant (F=6.33, p≤001), with self-perception of body shape (β=–.257, p=.015), body image perception (β=.241, p=.001), age (β=–.183, p=.008), and academic major (β=.153, p=.025) as significant factors. These variables explained 16.2% of the variance. The results suggest the need for programs that prevent body image distortion and promote positive body image perception among college students, as well as guidance to encourage rational clothing consumption behavior. This study is significant in examining the clothing consumption behavior of college students and will serve as fundamental data for developing desirable programs based on the study results.

Refractory materials, such as molybdenum and niobium, are potential candidates for cladding material due to their high melting temperatures and desirable mechanical properties at higher temperatures than those of zirconium alloys. However, refractory materials have low resistance to oxidation at elevated temperatures. Therefore, this study examined silicide or aluminide surface coatings as protection against rapid oxidation of refractory materials at elevated temperatures for a potential accident-tolerant fuel cladding. Silicide or aluminide layers were formed on refractory metal substrates by using the pack cementation method. The steam oxidation behavior of both coated and uncoated samples was compared by thermogravimetric analysis at 1200°C. The weight changes of the coated samples were greatly reduced than those of uncoated samples. Microstructural analyses demonstrated that the silicide and aluminide layers were oxidized to form a protective surface oxide that prevented rapid oxidation of the refractory substrate at elevated temperatures.

This study examined the feeding behavior and growth performance of 31 Hanwoo steers (10 months old; 278 ± 36.13 kg) within a precision livestock farming system using Roughage Intake Control (RIC) units for real-time data collection. Feeding behavior traits were derived from RIC database data using R software, with subsequent analysis conducted using SAS software. The results indicated that the steers visited the feed stations every 31.12 ± 11.99 minutes, averaging 11 ± 3.37 visits/day. Each feeding session lasted an average of 5.90 ± 1.55 minutes, resulting in a feed intake rate of 77.98 ± 22.53 g/min. Mean daily feed intake was 4.76 ± 1.36 kg, and body weight increased consistently, reaching an average of 412 ± 43.44 kg, with an average daily gain (ADG) of 1.26 ± 0.38 kg. Pearson correlation analysis revealed a strong relationship between daily feed intake and visit duration (r² = 0.621; p < 0.01) and an inverse correlation between daily feed intake and feed intake duration (r² = −0.445; p < 0.05), indicating behavioral adaptation. These findings highlight the importance of monitoring feeding behavior traits concerning growth performance, enhancing our understanding of individual animal behavior and its implications for productivity while emphasizing the role of advanced technologies in optimizing feed utilization in confined livestock systems.

The current study examines the digital behaviors of 124 university students enrolled in a blended learning class in Korea. The students were divided into two groups (upper and lower) based on their scores on a self-regulated learning questionnaire. Their digital behaviors were compared across four areas: (a) task completion scores; (b) strategy use; (c) the days on which tasks were completed; and (d) learning gains. The results revealed a significant difference in task completion scores between the upper and lower groups. However, no meaningful difference was observed in strategy use between the two groups. Students in the upper group were more proactive in completing videos, homework, and TOEIC tests, often finishing these tasks ahead of deadlines. In contrast, students in the lower group tended to complete their assignments on the due date. Finally, there were no significant differences in learning gains between the two groups. These findings may inform the design and management of online L2 learning programs.

이 연구는 여고생을 대상으로 외모관심도와 자기표현 욕구가 자아존중감 및 외모관리행동에 미치는 영향을 알아보기 위해 자 기기입식 설문조사 방법을 통해 이루어졌다. 조사 기간은 2024년 8월 1일부터 2024년 9월 20일까지 설문조사를 실시하였으며, 유효표본 200부를 최종 분석자료로 활용하였고 리커트 5점 척도 를 사용하였다. 첫째, 여고생의 외모 관심도와 자기표현 욕구는 모두 자아존중 감에 유의미한 정(+)의 영향을 미치는 것으로 나타나 외모관심도 와 자기표현 욕구가 높을수록 자아존중감도 높아지는 것으로 볼 수 있었다. 둘째, 여고생의 자기표현 욕구가 외모관리행동에 유의미한 정 (+)의 영향을 미치는 것으로 나타나 자기표현 욕구가 높을수록 외모관리행동도 높아지는 것으로 볼 수 있었다. 셋째, 여고생의 자아존중감이 외모관리행동에 유의미한 정(+)의 영향을 미치는 것으로 나타나 자아존중감이 높을수록 외모관리행 동도 높아지는 것으로 볼 수 있었다. 이상의 결과를 볼 때, 부모나 교육자는 여고생들이 외모관리행 동에 대한 올바른 판단하에 외모관심과 자기표현을 과하거나 지 나치지 않게 표출하여 자아존중감 및 외모관리를 할 수 있도록 지도하여야만 할 것이다. 결론적으로 여고생들은 질풍노도의 사춘기 단계에 있고 감정조 절이 미숙하기 때문에 자기표현 단계에서 부정적인 감정에 휘말 릴 수 있으며, 따라서 부모나 교육자는 솔직한 감정을 표출할 수 있는 열린 자세로 외모에 대한 건강한 인식과 올바른 개념을 정 립할 수 있도록 도와야 할 것이다.

본 연구의 목적은 실버층의 사회성이 외모관리행동에 미치는 영향을 검증하는데 있다. 이를 위해 55세 이상 실버층 186명을 대상으로 설문 조사를 진행하였다. 본 연구의 실증분석을 위하여 SPSS 26.0을 이용하 여 기술분석, 신뢰도분석, t-test, 분산분석(One-way-ANOVA)과 다중회 귀분석을 실시하였다. 주요 연구결과의 요약은 다음과 같다. 첫째, 실버 층의 일반적인 특성에 따른 사회성의 차이를 살펴본 결과, 연령, 학력, 월평균 용돈 등에 따라 통계적으로 유의한 차이가 나타났다. 둘째, 실버 층의 일반적인 특성에 따른 외모 관리 행동의 차이를 살펴본 결과 성별, 연령, 학력, 월평균 용돈에 따라 통계적으로 유의한 차이가 나타났다. 셋 째, 실버층의 사회성이 외모 관리 행동에 미치는 영향을 살펴본 결과 성 별, 연령, 사회성이 외모 관리 행동에 통계적으로 유의미한 영향을 미치 는 것으로 나타났다. 본 연구는 실버층을 대상으로 사회적 성향에 따른 외모관리행동 유형을 통해 개인의 다양한 사회적 역할에 적합한 외모 관 리 방향을 제시하였다는 점과, 뷰티 산업의 실버층 마케팅 전략 수립에 실증적인 자료를 제공하였다는 점에서 의의가 있다.

물 흡수-팽윤성 엘라스토머(water-swellable elastomer)는 연성 로봇, 센서 및 에너지 수확 장치에 사용할 수 있는 한 종류의 연성소재(soft material)이다. 대부분의 엘라스토머(elastomer)는 소수성(hydrophobicity)으로 인해 물에 대한 용해도 가 매우 낮지만, 물 흡수-팽윤성 엘라스토머는 내부 포함된 수용성 액적으로 인해 본래의 부피 이상의 물을 흡수할 수 있다. 엘라스토머 내부에 분산된 수용성 액적은 주변 수용성 매질보다 삼투압이 높은데, 액적과 주변 유체 사이의 삼투압 차이가 외부의 물이 액적으로 흡수되도록 한다. 외부 수용성 매질 환경의 조건에 따라, 삼투압이 다르기 때문에, 물 흡수 팽윤성 엘 라스토머는 다양한 팽윤 거동을 보일 수 있다. 본 논문에서는 이온 강도(ionic strength), 매질에 용해된 염의 종류, 온도 등이 물 흡수-팽윤성 엘라스토머의 팽윤 거동에 어떤 영향을 미치는지에 대한 체계적인 연구결과를 보여준다. 물 흡수-팽윤성 엘라 스토머를 만들기 위하여, 물과 글리세롤 혼합물 액적을 실리콘 엘라스토머(두께 150 μm)에 전단응력을 이용하여 분산시켰다. 이러한 실리콘 복합체는 외부 수용성 매질의 삼투압과 복합체 내부 수용성 액적의 삼투압의 차이에 따라 팽윤 거동이 결정되 는 것을 확인하였다. 따라서, 이러한 다양한 매질에서의 팽윤 거동에 대한 연구는 삼투압 센서 혹은 반투성막 등을 설계하는 데 필요한 정보를 제공할 수 있다.

This study investigated the behavior and environmental impact of expanded polystyrene (EPS) in a simulated marine environment, focusing on the effects of UV exposure. Through a series of controlled experiments, it was found that UV-induced weathering increased the formation of smaller EPS degradation products, leading to higher concentrations of dissolved organic carbon (DOC) in the seawater. Additionally, it was suggested that the assembly behavior of dissolved organic matter (DOM) contributed to the reduction of DOC levels over time. The EPS layer exhibited slightly higher DOC concentrations compared to the seawater, likely due to hydrophobic interactions that retained degradation products near the EPS. Analysis of the soil layer revealed that EPS particles and degradation products settled or adsorbed more extensively under UV conditions, indicating a greater risk of sediment contamination. Soil layer elution experiments further confirmed that EPS particles and their degradation products could migrate through soil pores, posing a potential contamination risk to other environments. UV exposure resulted in a twentyfold increase in DOC release from EPS compared to dark conditions. These findings highlight the persistent pollution potential of EPS in marine environments, especially under UV exposure, and emphasize the need for effective EPS waste management and further research into its environmental impacts.

This study analyzed the status of agrifood consumer competencies and the factors influencing them to provide useful information to improve the quality of life by strengthening the agrifood consumer competencies. The raw data of the 2022 Consumer Behavior Survey for Food collected by the Korea Rural Economic Research Institute were used. The data from 3,321 responses were used for the final analysis. Among the competencies, the average score of the cognitive and practical competencies were 3.543 and 3.459 points, respectively. In addition, the average scores of the specific areas within cognitive competency were 3.587 points for dietary competency, 3.557 points for civic competency, and 3.489 points for purchasing competency. Within practical competency, the average scores of the specific areas were 3.569 points for dietary competency, 3.422 points for civic competency, and 3.392 points for purchasing competency. Gender, age, monthly household income, marital status, administrative district, interest in health, and interest in food safety issues were the significant factors affecting the specific areas within cognitive competency. On the other hand, gender, age, educational level, monthly household income, marital status, administrative district, interest in food safety issues, and each of the areas within cognitive competency had a significant impact on the specific areas of practical competency.

본 연구는 여성 노인의 메이크업 행동이 자아존중감과 심리적 만족감에 미치는 영향을 알아보고자 하였다. 대상자는 경기도 H시에 거주하는 60-80 대 여성 노인 300명을 대상으로 2023년 12월 1일부터 약 5개월간에 걸쳐 설문조사가 진행하였으며, 회수된 272부 중 불성실한 응답 19부를 제외하고 총 253부를 최종 분석에서 사용하였다. 결과는 다음과 같다. 첫째, 메이크업 행동 중 동조성, 심미성, 흥미성, 예의성이 높을수록 자아존중감도 높아지는 것으로 나타났다. 둘째, 메이크업 행동 중 동조성, 심미성이 높을수록 심리적 만족감도 높아지는 것으로 나타났다. 셋째, 자아존중감이 높을수록 심리적 만족감도 높아지는 것으로 나타났다. 메이크업 행동과 심리적 만족감의 관계 에서 자아존중감의 간접효과는 통계적으로 유의하였다. 결론적으로 여성 노 인의 메이크업 행동은 필수적인 자기관리 행위이며, 외모의 변화를 통해 노화 스트레스를 없애고 심리적으로 긍정적인 영향을 주었다. 따라서 여성노인의 메이크업 행동은 여성 노인에 대한 부정적인 이미지나 편견을 감소시켜주는 동시에 여성 노인의 자존감을 높여주는데 중요한 방안으로 기여할 것이다.