Han-guk jiyeok sahoe saenghwal gwahak oeji最新文献

筛选
英文 中文
Expressive Effect of Victorian Costumes in Period Drama 维多利亚时代服装在古装剧中的表现效果
Han-guk jiyeok sahoe saenghwal gwahak oeji Pub Date : 2023-08-31 DOI: 10.7856/kjcls.2023.34.3.341
Ju-Ae Kim
{"title":"Expressive Effect of Victorian Costumes in Period Drama","authors":"Ju-Ae Kim","doi":"10.7856/kjcls.2023.34.3.341","DOIUrl":"https://doi.org/10.7856/kjcls.2023.34.3.341","url":null,"abstract":"This study analyzed the expression effect of the crinoline-style female costume, which was popular in the Victorian Age based on the Delong theory, through the drama The Empress. Theatrical research was conducted through a documentary survey of advanced domestic and foreign studies. Next, this study used the over-the-top (OTT) drama The Empress as a research tool for visual media. The analysis of the expression effect based on the Delong theory showed that the Elizabethan costume in the drama was seen as the expression of excitement, calmness, strength, and delicacy, most of which were in agreement with the Delong expression effect. The effect of excitement was expressed more, compared to delicacy. Hence, it was concluded that the characteristics and role of the main character of Elizabeth were expressed well through the costume. The result of this study could be used as basic data for the research of period dramas of the 19th century as well as for the design and manufacture of drama or stage costumes for dramas depicting the Crinoline style of costumes.","PeriodicalId":477378,"journal":{"name":"Han-guk jiyeok sahoe saenghwal gwahak oeji","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135991243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Serial Multiple Mediating Effects of Self-identity and Academic Failure Tolerance in the Relationship between Parental Attachment and School Adjustment in Early Adolescents with Sluggish Cognitive Tempo (SCT) Tendencies 自我认同和学业失败容忍在迟缓认知节奏倾向青少年父母依恋与学校适应关系中的多重中介作用
Han-guk jiyeok sahoe saenghwal gwahak oeji Pub Date : 2023-08-31 DOI: 10.7856/kjcls.2023.34.3.419
Ji-Hyun Oh
{"title":"The Serial Multiple Mediating Effects of Self-identity and Academic Failure Tolerance in the Relationship between Parental Attachment and School Adjustment in Early Adolescents with Sluggish Cognitive Tempo (SCT) Tendencies","authors":"Ji-Hyun Oh","doi":"10.7856/kjcls.2023.34.3.419","DOIUrl":"https://doi.org/10.7856/kjcls.2023.34.3.419","url":null,"abstract":"This study explores the protective factors that influence positive school adjustment in early adolescents afflicted with subclinical and clinical sluggish cognitive tempo (SCT) tendencies. We further examine the relationship between the variables. Specifically, the study evaluated the simple mediating effect and serial multiple mediating effects of self-identity and academic failure tolerance in the relationship between parental attachment and school adjustment in early adolescents with SCT. The study utilized data from the 12th Korean Children Panel (2019). The mediation models were tested using Models 4 and 6 of the PROCESS Macro. Our results showed that self-identity completely mediates whereas academic failure tolerance partially mediates the relationship between parental attachment and school adjustment. The serial multiple mediating effects of self-identity and academic failure tolerance in the relationship between parental attachment and school adjustment were found to be significant. Additionally, only the indirect effect of the path ‘parental attachment ⟶ self-identity ⟶ academic failure tolerance ⟶ school adjustment’ was found to be significant.","PeriodicalId":477378,"journal":{"name":"Han-guk jiyeok sahoe saenghwal gwahak oeji","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135990982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Study of Consumer Choices in Online Grocery Shopping and Satisfaction After the COVID-19 Outbreak 新冠肺炎疫情后消费者网购选择及满意度研究
Han-guk jiyeok sahoe saenghwal gwahak oeji Pub Date : 2023-08-31 DOI: 10.7856/kjcls.2023.34.3.437
Ahyoung Lim, Myounghun Choi, Soye You
{"title":"A Study of Consumer Choices in Online Grocery Shopping and Satisfaction After the COVID-19 Outbreak","authors":"Ahyoung Lim, Myounghun Choi, Soye You","doi":"10.7856/kjcls.2023.34.3.437","DOIUrl":"https://doi.org/10.7856/kjcls.2023.34.3.437","url":null,"abstract":"This study examined the factors influencing online food purchasing (channel selection, purchasing share, and satisfaction with online food purchases) after the occurrence of coronavirus disease 2019 (COVID-19), using raw data from the 2021 Food Consumption Behavior Survey collected by the Korea Rural Economic Institute. The results of this study revealed that when it comes to selecting online stores (channels) for food purchases, consumers prioritized accuracy and promptness of delivery, stability of payment systems, and price. The reasons for choosing online food purchases were primarily for the convenience and efficiency offered, such as delivery services and their timesaving aspects. Additionally, consumers also considered superior product quality and variety as the advantages of online food shopping. Furthermore, in terms of online food purchasing behavior, the following were observed: First, consumers primarily use mobile devices for online food shopping. Specialized online shopping malls are the most frequently used distribution channels for primary food purchases online. Additionally, when analyzing the factors influencing the choice of the online food purchasing channel (Personal Computer [PC] vs Mobile Phone), BMI (Body Mass Index) was found to be a significant factor influencing the choice. Second, the proportion of online food purchases was reported to be higher or constant compared to the previous year, and the factors influencing this trend were concerns about the influx of food from external sources and motivations, gender, income, household size, seniors. Third, when analyzing the factors influencing overall satisfaction with online food purchases, it was found that the proportion of online food purchases, satisfaction with price and quality, concerns about external food, motivations, and generations were significant factors.","PeriodicalId":477378,"journal":{"name":"Han-guk jiyeok sahoe saenghwal gwahak oeji","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135991248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Needs Assessment of Support Policies on Agricultural Work and Rural Life for Female Farmers 女性农民农业工作和农村生活支持政策需求评估
Han-guk jiyeok sahoe saenghwal gwahak oeji Pub Date : 2023-08-31 DOI: 10.7856/kjcls.2023.34.3.475
Ji-Young Han, Jung-Soo Nam, Yong Kim, Dong Joo Kim, Jung Shin Choi
{"title":"Needs Assessment of Support Policies on Agricultural Work and Rural Life for Female Farmers","authors":"Ji-Young Han, Jung-Soo Nam, Yong Kim, Dong Joo Kim, Jung Shin Choi","doi":"10.7856/kjcls.2023.34.3.475","DOIUrl":"https://doi.org/10.7856/kjcls.2023.34.3.475","url":null,"abstract":"This study was undertaken to identify the perception of domestic female farmers towards support policies and demands for policies. A survey of 547 female farmers was conducted and 520 responses were included in the final analysis. Our results revealed that policy demands included petitions to encompass the work and life of female farmers. Furthermore, high interest and high satisfaction were displayed for policies providing financial support, such as farmers’ allowances and women’s farmers’ rights. Lastly, there was a high demand for the distribution of labor-saving equipment for stable farming activities of female farmers.","PeriodicalId":477378,"journal":{"name":"Han-guk jiyeok sahoe saenghwal gwahak oeji","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135991250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Factors Influencing Satisfaction with Medical Institutions according to Health Condition and Medical Use Condition of Single Elderly Households in Rural Areas: Using the Results of Survey on Rural Well-being 2021 农村老年单身家庭健康状况和医疗使用状况对医疗机构满意度的影响因素——基于《2021年农村幸福感调查》结果
Han-guk jiyeok sahoe saenghwal gwahak oeji Pub Date : 2023-08-31 DOI: 10.7856/kjcls.2023.34.3.457
Min-U Lee, Gi-Chun Seo, Eun-Jung Hong
{"title":"Factors Influencing Satisfaction with Medical Institutions according to Health Condition and Medical Use Condition of Single Elderly Households in Rural Areas: Using the Results of Survey on Rural Well-being 2021","authors":"Min-U Lee, Gi-Chun Seo, Eun-Jung Hong","doi":"10.7856/kjcls.2023.34.3.457","DOIUrl":"https://doi.org/10.7856/kjcls.2023.34.3.457","url":null,"abstract":"This study examines the satisfaction with medical institutions by considering the type of medical usage satisfaction with medical institutions. The subjects were 1,251 single elderly households living in rural areas. Raw data was procured from the ‘Survey on Rural Well-being in 2021’. A stepwise regression analysis was conducted to identify the factors influencing satisfaction with medical institutions. Significant differences were obtained in satisfaction with medical institutions based on various factors, including educational background, monthly health care expenditure, happiness with life, subjective health status, satisfaction with own health status, health comparison with similar age groups, health status compared to the previous year, number of visits to medical institutions, means of transportation to medical institutions, required time, difficulty in treating diseases, satisfaction with medical personnel, and satisfaction with accessibility to medical facilities. The variables that significantly affected satisfaction with medical institutions were residence area, educational background, monthly health care expenditure, age, health status compared to the previous year, satisfaction with medical personnel, satisfaction with accessibility to medical facilities, primarily used medical institutions, number of visits to medical institutions, and difficulty in treating diseases. Based on the results, this study suggests policy alternatives tailored to consumers, specifically single-person elderly households in rural areas. These measures aim to improve access to medical institutions, reduce the burden of medical expenses, and enhance subjective health conditions.","PeriodicalId":477378,"journal":{"name":"Han-guk jiyeok sahoe saenghwal gwahak oeji","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135990981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Case Study on Experience of Parents with Children who are Youth Athletes 青少年运动员子女的父母体验个案研究
Han-guk jiyeok sahoe saenghwal gwahak oeji Pub Date : 2023-08-31 DOI: 10.7856/kjcls.2023.34.3.401
Yu-seong Na, Ji-Hyun Oh
{"title":"A Case Study on Experience of Parents with Children who are Youth Athletes","authors":"Yu-seong Na, Ji-Hyun Oh","doi":"10.7856/kjcls.2023.34.3.401","DOIUrl":"https://doi.org/10.7856/kjcls.2023.34.3.401","url":null,"abstract":"This study utilized a qualitative case study approach to explore the essence and meaning of the experience of becoming parents, for parents with “early adolescent children” in the preadolescent phase. The study recruited three parents who had children ranging from 6th grade in elementary school to 2nd grade in middle school, all belonging to the early adolescent group of youth athletes, in a domestic setting. Semi-structured interviews were conducted with each participant three times, lasting for 1 to 2 hours per session, using an open-ended questionnaire. The data analysis of this study employed a multiple-case analysis method. This involved conducting within-case analysis to provide detailed descriptions and identify themes within each case, as well as conducting cross-case analysis to extract characteristics and themes across cases. As a result, ten subcategories and five core categories were identified. The core categories included ‘Career guide parents’, ‘Unified family, excluded siblings’, ‘Another family: distant yet close relationship’, ‘Role of a manager and role of a mom, dad’, and ‘Not in the role of a manager or parent, just myself’. This is expected to contribute foundational material for counseling and parent education targeting parents of youth athletes. This would provide valuable insights to such parents.","PeriodicalId":477378,"journal":{"name":"Han-guk jiyeok sahoe saenghwal gwahak oeji","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135991252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of the Association between Generalized Anxiety Disorder and Dietary Behaviors in Adolescents -Data from the 17th Korea Youth Risk Behavior Survey 青少年广泛性焦虑障碍与饮食行为的关系分析——来自第17届韩国青少年危险行为调查的数据
Han-guk jiyeok sahoe saenghwal gwahak oeji Pub Date : 2023-08-31 DOI: 10.7856/kjcls.2023.34.3.383
Soo-Jin Lee, Ho-Kyung Ryu
{"title":"Analysis of the Association between Generalized Anxiety Disorder and Dietary Behaviors in Adolescents -Data from the 17th Korea Youth Risk Behavior Survey","authors":"Soo-Jin Lee, Ho-Kyung Ryu","doi":"10.7856/kjcls.2023.34.3.383","DOIUrl":"https://doi.org/10.7856/kjcls.2023.34.3.383","url":null,"abstract":"This study was conducted to examine the status of generalized anxiety disorder (GAD) among adolescents and its association with dietary behaviors, utilizing the raw data from the 17th Korea Youth Risk Behavior Survey (KYRBS). This study included 45,106 participants categorized into the low-risk (LRG, 88.3%) and high-risk (HRG, 11.7%) groups for GAD. The analysis of the effect of GAD on dietary behaviors revealed that in the HRG, there was a likelihood of consuming fast food (over 5 times/week), odds ratio (OR): 1.548 for males. Similarly, for females, there was a likelihood of consuming fast food (3-4 times/week), OR: 1.744 for females. For females, there was a decrease in the frequency of eating breakfast (0-2 times/week, OR: 1.109) and an increase in consuming sweetened beverages (over 5 times/week, OR: 1.433). While, in the analysis of the influence of dietary behaviors on GAD, it was found that in males, consuming sweetened beverages (over 5 times/week) increased the likelihood of being in the HRG, OR: 1.279. Additionally, the probability of being in the HRG increased gradually with the frequency of consumption of fast food (3-4 times/week, and over 5 times/week), with ORs 1.133 and 1.564, respectively. For females, the likelihood of being in the HRG increased by OR: 1.113 when having breakfast 0-2 times/week. Moreover, as the frequency of consuming sweetened beverages (over 5 times/week) and fast food (over 3-4 times/week) increased, the probability of being in the HRG also increased with ORs 1.436 and 1.745, respectively. This study confirms the association between GAD and dietary behaviors, suggesting that this should be incorporated into the appropriate procedures for the management of GAD.","PeriodicalId":477378,"journal":{"name":"Han-guk jiyeok sahoe saenghwal gwahak oeji","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135990983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparison of the Health Behavior and Nutrient Intake of the Korean Elderly Before and After the Start of the COVID-19 Pandemic: Data from the 8th Korea National Health and Nutrition Examination Survey COVID-19大流行前后韩国老年人健康行为和营养摄入的比较:来自第八次韩国国民健康和营养检查调查的数据
Han-guk jiyeok sahoe saenghwal gwahak oeji Pub Date : 2023-08-31 DOI: 10.7856/kjcls.2023.34.3.353
Ji-Yeong Kim, Bok-Mi Jung
{"title":"Comparison of the Health Behavior and Nutrient Intake of the Korean Elderly Before and After the Start of the COVID-19 Pandemic: Data from the 8th Korea National Health and Nutrition Examination Survey","authors":"Ji-Yeong Kim, Bok-Mi Jung","doi":"10.7856/kjcls.2023.34.3.353","DOIUrl":"https://doi.org/10.7856/kjcls.2023.34.3.353","url":null,"abstract":"This study compared the health behavior, nutrient, and food intake, nutrient density, and index of nutritional quality(INQ) in 2019 before the coronavirus disease-2019 (COVID-19) pandemic to that in 2020, after the start of the COVID-19 pandemic, in Korean elderly over 65 years of age. Data from the 8th Korea National Health and Nutrition Examination Survey (KNHANES) was used. The results showed that the average sleep time increased after compared to before the pandemic began. The frequency of eating out decreased, and the intake of vegetables increased while the intake of fish decreased after the pandemic began. Also, the intake of fiber, potassium, and vitamin B2 had increased since COVID-19 struck. An evaluation of the nutrient density and Index of Nutritional Quality (INQ) showed that the intake of vitamin B1 decreased while that of vitamin B2 increased in this period. It was found that elderly Koreans had an insufficient intake of vitamin A, vitamin C, niacin, and calcium regardless of the pandemic. Thus, this study revealed that the COVID-19 pandemic had little effect on the eating habits of Korean seniors. However, sleeping hours and the frequency of eating out were affected during the pandemic.","PeriodicalId":477378,"journal":{"name":"Han-guk jiyeok sahoe saenghwal gwahak oeji","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135991245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparison of the Nutritional Components and Antioxidant Activity in Aruncus dioicus var. kamtschaticus with Different Drying Methods 不同干燥方法对苦荞麦营养成分及抗氧化活性的影响
Han-guk jiyeok sahoe saenghwal gwahak oeji Pub Date : 2023-08-31 DOI: 10.7856/kjcls.2023.34.3.365
Jeong-Yeon Kim, Yong-Jae Nam, Jae-Joon Lee
{"title":"Comparison of the Nutritional Components and Antioxidant Activity in Aruncus dioicus var. kamtschaticus with Different Drying Methods","authors":"Jeong-Yeon Kim, Yong-Jae Nam, Jae-Joon Lee","doi":"10.7856/kjcls.2023.34.3.365","DOIUrl":"https://doi.org/10.7856/kjcls.2023.34.3.365","url":null,"abstract":"The purpose of this study was to compare the effects of two drying methods (hot air drying [HAD] or vacuum freeze drying [FAD]) on the physicochemical components and antioxidative activities of Aruncus dioicus var. kamtschaticus powder. The crude fat content in the FAD was higher than that in the HAD. There were no significant differences in the proximate compositions, such as contents of moisture, crude ash, crude protein, and carbohydrates, depending on the drying methods. The total amino acid and essential amino acid contents were significantly higher in FAD than in HAD. The valine, phenylalanine, lysine, histidine, aspartic acid, asparagine, glutamic acid, arginine, ornithine, and γ-amino-n-butyric acid (GABA) contents in FAD were higher than in HAD, while the serine, phosphoserine, proline, glycine, alanine, tyrosine, and taurine contents in HAD were higher than in FAD. There were no significant differences in saturated fatty acid, monounsaturated fatty acid, and polyunsaturated fatty acid contents based on the drying methods. The most abundant fatty acid in the FAD was linolenic acid, and the linolenic acid content was approximately the same, regardless of the drying method used. The contents of malic acid and total organic acids in the FAD were higher than in the HAD, while the content of succinic acid was higher in the HAD than in the FAD. Vitamin C and E contents in HAD were higher than those in FAD. The total polyphenol and total flavonoid contents, the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2-azino- bis-3-ethylbenzothiazoline-6-sulphonic acid (ABTS) radical scavenging activities of the FAD sample were higher than those of the HAD sample. These results indicate that vacuum freeze drying is a better drying method for preserving the nutritional components and antioxidative activities. These study results may provide the basic data for follow-up studies seeking a better understanding of the functional properties of the FAD powder.","PeriodicalId":477378,"journal":{"name":"Han-guk jiyeok sahoe saenghwal gwahak oeji","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135991246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信