2022 International Conference on Sustainable Islamic Business and Finance (SIBF)最新文献

筛选
英文 中文
Perception of SMEs in India towards Employee Health Insurance Plan 印度中小企业对员工健康保险计划的看法
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9939961
Arpita Gurbaxani, R. Raman
{"title":"Perception of SMEs in India towards Employee Health Insurance Plan","authors":"Arpita Gurbaxani, R. Raman","doi":"10.1109/SIBF56821.2022.9939961","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9939961","url":null,"abstract":"Small and Medium Enterprises must consider all the aspects of employee health insurance. Factors influencing the decisions on employee health insurance plans include the total number of employees, insurance plan, employee age, risk factors, advertisement, and influence of healthcare mediators. The objective of the research is to identify the elements that influence the decision of Small and Medium Enterprises while opting for employee health insurance. A sample survey among 60 SMEs located in the Pune region was conducted to determine the perception of SMEs toward employee health insurance plans. The respondent SMEs belonged to various sectors such as Information Technology, manufacturing, consultancy, fintech, and healthcare. Statistical tests like Chi-square and Independent Sample T Test were conducted to obtain the results of the study. The decision to pick an employee health insurance plan is not influenced by the sector of SME. SMEs with a higher number of employees consider purchasing health insurance plans for employees. The conclusions were established that the decision to cover an employee's family members under an insurance plan is independent of the type of plan. SMEs consider employee health insurance vital as it provides additional benefits and helps employee retention. The study is apprehended to benefit health insurance companies in framing insurance policies for employees of SMEs. The study will also benefit in deciding the awareness schemes for health insurance plans.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115193902","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
Making the Hidden Visible: Managing Disability in the Workplace 让隐藏的可见:管理工作场所的残疾
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9939952
A. Ayari
{"title":"Making the Hidden Visible: Managing Disability in the Workplace","authors":"A. Ayari","doi":"10.1109/SIBF56821.2022.9939952","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9939952","url":null,"abstract":"Despite the existence of laws and regulations that are meant to protect the rights of disabled people, disabled individuals continue to be underrepresented in work and are paid less. This study focuses on the experiences of disabled people in the workplace regarding discrimination and unfair treatment, as well as how their abilities and performance compare to those of their coworkers. The study was conducted at ten (10) private companies in three (3) diverse sectors and among self-employed people working in various industries across the country of Bahrain. After distributing the surveys fairly among the stated respondents, fifty surveys were collected out of the 70 sent out. In addition, information was acquired through face-to-face interviews with a few selected respondents who volunteered to be questioned to determine the workplace issues they experienced. These interviews aimed to acquire information on the respondents' experiences.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114354614","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
Transforming the Training Programs by Leveraging Employee Value Proposition for Employer Branding 通过利用员工价值主张实现雇主品牌的培训计划转型
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9940070
Darshna Verma, Deepika Pandita
{"title":"Transforming the Training Programs by Leveraging Employee Value Proposition for Employer Branding","authors":"Darshna Verma, Deepika Pandita","doi":"10.1109/SIBF56821.2022.9940070","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9940070","url":null,"abstract":"The IT Industry has seen an era of significant attrition which impedes its growth in the most suitable economy for technology businesses. To cater to the issue of high attrition and attract the best talent, one key aspect could be leveraging its entry-level training program for new joiners (Engineers & Non-engineers). The purpose of this paper is to explain the importance of leveraging training programs for better Employer Branding to retain and attract talent in the era of high attrition and competition. This paper is based on primary research on current branding practices of the IT companies in India and the choice of employer survey for the entry-level talent pool. The authors studied the Employer Branding strategies of various IT organizations in the country to compare and assess their USPs and the practices in place, which may give them a competitive advantage. The authors have identified how the training programs can be structured to promise career growth to the employees and help the industry build a strong talent pool. The authors have also proposed a Six-factor model for Entry level talent programs in IT companies that outlines the hygiene factors and motivators to attract the best talent and make the company their choice of employer.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122053590","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 mediation role of customer relationship quality of social media marketing activities and brand loyalty. Evidence from Palestine 客户关系质量对社会化媒体营销活动与品牌忠诚度的中介作用。来自巴勒斯坦的证据
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9939844
R. Awadallah, Sameer Hamdan, F. Awamleh, Ala’ Fathi
{"title":"The mediation role of customer relationship quality of social media marketing activities and brand loyalty. Evidence from Palestine","authors":"R. Awadallah, Sameer Hamdan, F. Awamleh, Ala’ Fathi","doi":"10.1109/SIBF56821.2022.9939844","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9939844","url":null,"abstract":"Social media platforms add advantages to Palestinian businesses in a great way. This study established a model to present the idea of how social media marketing activities (SMMA) impact brand loyalty (BL) in the existence of customer relationship quality (CRQ). Especially in telecommunication companies' brands, it also studied generation as a moderator between social media marketing activities and customer relationship quality. The study adopted a SEM program and obtained data from all Palestinian university students who are telecommunications clients. The results displayed that social media marketing activities positively influence customer relationship quality. Furthermore, social media marketing activities had a positive influence on brand loyalty. In addition, Generation moderates between social media marketing activities, customer relationship quality, and brand loyalty. The findings indicated that customer relationship quality (CRQ) significantly affects brand loyalty (BL). Moreover, the variable customer relationship quality partially mediates between social media marketing activities and brand loyalty. The study put contribution to the academic literature by observing how social media marketing activities (SMMA) endorse customer relationship quality (CRQ) and brand loyalty (BL) in the service sector and a developing country.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129360338","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
No Woman, No Tax Avoidance? A Study on CEO Gender in Indonesia 没有女人就没有避税?印度尼西亚CEO性别研究
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9939674
Ella Rahmayanti, N. A, Lilis Maryasih, Dzakiyy Hadiyan Achyar
{"title":"No Woman, No Tax Avoidance? A Study on CEO Gender in Indonesia","authors":"Ella Rahmayanti, N. A, Lilis Maryasih, Dzakiyy Hadiyan Achyar","doi":"10.1109/SIBF56821.2022.9939674","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9939674","url":null,"abstract":"This study aims at investigating whether female CEOs in Indonesia tend to commit tax avoidance and whether family firms and audit committee supervision minimize tax avoidance. Using a simple random sampling technique, 65 manufacturing companies were selected as research samples that are wholly registered on the Indonesia Stock Exchange. A total of 325 firm-year observations were provided by their annual reports from 2016 to 2020 and processed within the multiple linear regression statistical method. The study depicts those female CEOs positively affect tax avoidance. Female CEOs are highly likely to take advantage of regulatory loopholes to perform tax avoidance. Meanwhile, family firms with family control reduce tax avoidance practices. However, audit committee supervision does not possess a sufficient effect on tax avoidance, which indicates that the audit committee does not possess the capacity to oversee corporate tax management.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132027103","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: 3
Revamping Employee Engagement Practices by Augmenting Data Analytics 通过增强数据分析改进员工敬业度实践
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9939857
Ishika Agarwal, Deepika Pandita
{"title":"Revamping Employee Engagement Practices by Augmenting Data Analytics","authors":"Ishika Agarwal, Deepika Pandita","doi":"10.1109/SIBF56821.2022.9939857","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9939857","url":null,"abstract":"With the advent of COVID-19, the corporate world underwent a massive change. This stressed the need of effective employee engagement more than ever. Therefore, this study aims to understand the various dimensions of employee engagement and the use of Natural Language Processing to ensure an engaged workforce. To understand the problem, primary data collection was done with the help of interviews. The authors conducted interviews of 100 professionals from manufacturing, FMCG and IT companies in India to understand the problem from the root level. The paper then proposes a model, i.e., the PAUSE model which aims at categorizing the broad topic of employee engagement into five distinct categories. These categories tell us about the various areas in which employees can feel a sense of detachment or disengagement towards the organization. The model then suggests corrective actions that can be taken at the ground level to improve engagement in the targeted category.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122282928","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: 1
Corporate Social Responsibility and Customer Satisfaction: A Case Study of Telecommunication Companies in Bahrain 企业社会责任与顾客满意:以巴林电信公司为例
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9940037
Amna Ali Alnefaiei, Raala Mohamed Alathali
{"title":"Corporate Social Responsibility and Customer Satisfaction: A Case Study of Telecommunication Companies in Bahrain","authors":"Amna Ali Alnefaiei, Raala Mohamed Alathali","doi":"10.1109/SIBF56821.2022.9940037","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9940037","url":null,"abstract":"The purpose of this study is to investigate the philanthropic practices and its effect on customer satisfaction in telecommunication companies in Bahrain. Quantitative approach was utilized by collecting 391 responses using an online questionnaire. A “cluster sampling” was applied to gather data from customers of telecommunication companies in Bahrain. Various analysis techniques were applied such as percentage, frequencies, descriptive analysis, regression analysis, and ANOVA analysis to analyze the collected data. The result demonstrated that the telecommunication companies in Bahrain contribute to community development and enhance quality of life through several philanthropic practices applied in education, health, culture, art, science, and sport. It is revealed that philanthropic responsibility of Carroll's pyramid of CSR has a significant impact on customer satisfaction.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134544932","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
Reformation of Nigerian Legal and Regulatory Framework for Islamic Banking Sector: Lessons from the UK and Malaysia 尼日利亚伊斯兰银行业法律和监管框架的改革:来自英国和马来西亚的经验
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9940041
Olarinde E. Smaranda, Idem Udosen Jacob
{"title":"Reformation of Nigerian Legal and Regulatory Framework for Islamic Banking Sector: Lessons from the UK and Malaysia","authors":"Olarinde E. Smaranda, Idem Udosen Jacob","doi":"10.1109/SIBF56821.2022.9940041","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9940041","url":null,"abstract":"Islamic finance represents a unique method of banking transaction with an element of interest-free and sharing in profits and losses, hence its contribution to the economic growth of Nigeria cannot be overemphasised. However, expanding Islamic finance relies on having a robust legal framework. This study aims to investigate the regulatory framework governing Sharia banks in Nigeria. The study attempts to draw lessons from the United Kingdom and Malaysia in the area of Islamic banking and make a proposition that Nigeria can adopt in tackling the challenges it faces in regulating Islamic banking. Finally, the study would offer a plausible guide as to the need for enactment of a robust Sharia-compliant law in Nigeria and harmonisation of the various Islamic bank's laws for purpose of completeness, effectiveness, and efficiency.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133783042","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: 2
Understanding Service Quality, Customer Satisfaction and Banking Behaviour from an E-Banking Perspective: An Empirical Approach 从电子银行的角度理解服务质量、客户满意度和银行行为:一个实证方法
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9939858
Megha Jaiwani, Santosh Gopalkrishnan, S. Mohanty, Nilaya Murthy
{"title":"Understanding Service Quality, Customer Satisfaction and Banking Behaviour from an E-Banking Perspective: An Empirical Approach","authors":"Megha Jaiwani, Santosh Gopalkrishnan, S. Mohanty, Nilaya Murthy","doi":"10.1109/SIBF56821.2022.9939858","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9939858","url":null,"abstract":"Digital innovation is redefining industries and changing the way businesses function. Digitisation and innovative technologies are creating unprecedented disruption in the banking sector. In the conundrum of technological advancements, E-banking has evolved into one of the most critical banking services that, when effectively implemented, may improve customer contentment while also providing banks with a competitive advantage. In this context, the study empirically evaluates the number and types of e-banking services used by customers of different banks and their satisfaction after using the technology-based services based on service quality dimensions like Ease/Convenience of use, reliability, security, responsiveness and personalisation. The study further examines the relationship between customer satisfaction, their behavioural intentions and change in their banking habits on using the e-banking services to gauge its impact on the banking industry. Primary data was collected from 200 respondents across PAN India using a structured questionnaire, explicitly targeting regions where e-banking services are not fully embraced. A random sampling technique was used to gather responses. Data interpretation was made using graphs and tables. Whereas data analysis was performed using statistical tools such as multiple regressions and univariate regressions to determine the impact of e-banking service delivery on the customers' satisfaction with banks. The study exhibited that service quality has a favourable influence on customer satisfaction and that there is a positive association between customer satisfaction and behavioural intention. On the contrary, given data constraints, the study could not empirically establish the relationship between customer satisfaction and banking habits. Thus, we conclude that the relative importance of service quality dimensions can help the banking industry focus on enhancing customer satisfaction and bringing desirable changes in customers' behaviour.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125838787","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: 1
The Impact of Financial Development on Energy Consumption in ASEAN-6: A Quantile Regression Analysis 金融发展对东盟六国能源消费的影响:分位数回归分析
2022 International Conference on Sustainable Islamic Business and Finance (SIBF) Pub Date : 2022-10-11 DOI: 10.1109/SIBF56821.2022.9939814
Maulidar Agustina, M. S. Abd. Majid, H. Hafasnuddin, Eddy Gunawan, Murkhana Murkhana, Z. Zulkifli
{"title":"The Impact of Financial Development on Energy Consumption in ASEAN-6: A Quantile Regression Analysis","authors":"Maulidar Agustina, M. S. Abd. Majid, H. Hafasnuddin, Eddy Gunawan, Murkhana Murkhana, Z. Zulkifli","doi":"10.1109/SIBF56821.2022.9939814","DOIUrl":"https://doi.org/10.1109/SIBF56821.2022.9939814","url":null,"abstract":"This study intends to determine the effects of financial development on the consumption of renewable Energy in the ASEAN-6 (Indonesia, Malaysia, Thailand, Singapore, Philippines, and Vietnam) from 2000 to 2020. Panel data of the variable Renewable Energy Consumption, and financial development measured using banking sector indicators represented by Domestic credit to the private sector by banks (DC) and Bank's capital to assets ratio (BC), as well as capital market sector indicators represented by the Market capitalization of listed domestic companies (MC) and Stocks traded total value (ST), obtained from the World Bank. This study got two critical points conclusion based on the findings of the analysis utilizing the quantile regression model. First, for banking sector indicators, Domestic credit to the private sector by banks (DC) has a significantly positive effect on Renewable Energy Consumption. However, Bank's Capital to Assets Ratio (BC) has no impact on Renewable Energy Consumption. Second, in capital market sector indicators, the market capitalization of registered domestic companies (MC) variable has a negative and significant impact on Renewable Energy Consumption. While the Stocks Traded Total Value (ST) has a positive and significant impact on Renewable Energy Consumption (REC). This highlights that the financialization track needs to be strengthened, according to ASEAN-6 policymakers. In order to increase demand for renewable Energy, the banking industry and capital market must be able to support high-quality finance allocations that significantly influence productivity and economic growth. Citizens should also be aware of environmental issues and renewable energy benefits.","PeriodicalId":103733,"journal":{"name":"2022 International Conference on Sustainable Islamic Business and Finance (SIBF)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116030462","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