Access Journal - Access to Science, Business, Innovation in the digital economy最新文献

筛选
英文 中文
Importance of healthcare economy on sustainable development of the country 卫生经济对国家可持续发展的重要性
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-11-06 DOI: 10.46656/access.2023.4.1(5)
Gia Zoidze, G. Abuselidze
{"title":"Importance of healthcare economy on sustainable development of the country","authors":"Gia Zoidze, G. Abuselidze","doi":"10.46656/access.2023.4.1(5)","DOIUrl":"https://doi.org/10.46656/access.2023.4.1(5)","url":null,"abstract":"The subject of our research is the main features of optimizing the process of formation of innovative approaches in private and state hospitals in Georgia. Objectives: The main aim of the research is to determine the stimulating effect of innovative processes in the development of the health economy and the improvement of the quality of management of local medical institutions; Also, analyze the obstacles to the implementation of the main principles of innovative management and determine the ways to overcome them. On the basis of the mentioned, the perspectives of the formation of innovative approaches in the country should be identified and the practical-methodical recommendations necessary for its development should be developed. Methods/Approach. The methodological basis of the research is both general-scientific and economic research methods, namely: positive and normative analysis, demand-supply analysis, analysis and synthesis, systematic and logical approaches, grouping, comparison and evaluation methods. Results: The proposed individual proposals and recommendations will create the desired incentives in terms of innovative development and economic sustainability of the country's medical field. All this will increase the quality of local medical institutions, help them gain a competitive advantage and achieve long-term success. Conclusions: The paper examines the mechanisms and activities promoting innovative development in the field of healthcare in Georgia, which directly or indirectly contribute to the development of innovative approaches in the country; In addition, on the basis of theoretical materials and practical studies, the basic recommendations necessary for the innovative development of the healthcare economy in Georgia have been formulated.","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"228 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124527221","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 role of foreign direct investment in the national economy and correlation analysis 外商直接投资在国民经济中的作用及其相关性分析
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-11-02 DOI: 10.46656/access.2023.4.1(4)
Ramin Tsinaridze, Nino Makharadze
{"title":"The role of foreign direct investment in the national economy and correlation analysis","authors":"Ramin Tsinaridze, Nino Makharadze","doi":"10.46656/access.2023.4.1(4)","DOIUrl":"https://doi.org/10.46656/access.2023.4.1(4)","url":null,"abstract":"Objectives: World trends point to the importance of FDI. It directly or indirectly affects the economy and all other industries. Foreign investment has a significant impact on the development of both economic and intangible values. The main goal the task of scientific work is to study the impact of foreign direct investment. Methods/Approach: FDI statistics in the world and in Georgia, studies and correlations will allow us to analyze the pace of development of Georgia's investment environment, its advantages and disadvantages. Results: A correlation has been established between foreign direct investment and employment, gross domestic product and export-import. The correlation between foreign direct investment and employment is strong, which is logical due to the strong impact on employment. The weakest connection is with imports and exports. In this regard, it is interesting to note that an increase in foreign direct investment also leads to an increase in the level of employment. We have studied the compatibility of Georgian business and foreign investment. Conclusions: International experience and trends in Georgia show that FDI is one of the main drivers of solving socio-economic problems. The investment environment is connected with all important sectors and directions of the country. Despite the global pandemic and the difficult economic situation of Georgia, as a result of the implementation of important regulations, it will be possible to improve the economy through foreign direct investment.","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114446157","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
Multifactor models for studying the impact of investment activities of enterprises on their profitability: case of Ukraine 研究企业投资活动对盈利能力影响的多因素模型:以乌克兰为例
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-10-24 DOI: 10.46656/access.2023.4.1(1)
N. Dziubanovska, V. Maslii, Z. Lytvyn
{"title":"Multifactor models for studying the impact of investment activities of enterprises on their profitability: case of Ukraine","authors":"N. Dziubanovska, V. Maslii, Z. Lytvyn","doi":"10.46656/access.2023.4.1(1)","DOIUrl":"https://doi.org/10.46656/access.2023.4.1(1)","url":null,"abstract":"Objectives: Understanding the processes of transformation of the investment activity of domestic business entities is decisive, when making decisions and forming effective scenarios for the further development of business activities aimed at increasing profits. There are complex economic realities for the development of production today, so, the economic agents are faced with the task of finding the optimal ratio between investments in the production restructuring processes and investments in innovative projects. This problem can be solved only by forming the optimal structure of their own capital investments. The purpose of this study is to identify the main trends in the investment activity of domestic enterprises using a comprehensive analysis of the structural dynamics of real investment projects and its impact on their financial results. Methods/Approach: During the analysis of investment process, relative indicators that characterize the shares of the components in the structure of the investments were calculated;charts and graphs were constructed, analytical tables were compiled. Multifactor linear regression models were built to determine the importance of the investment components' dominance and their impact on the profitability of the enterprise. Canonical correlation analysis was used to study the relationship between financial performance indicators of Ukrainian enterprises and using the high technologies in their production activities. Results: It was found that the dynamics of indicators that identify structural and dynamic changes in the structure of capital investments of Ukrainian enterprises and the selection of certain structural regimes indicate the dependence of the rate of growth and structural shifts on the political situation in the country, as well as on the coronavirus pandemic, which caused significant fluctuations in the investment activity of domestic business entities. Conclusions: The study confirmed that the indicator of the financial performance of Ukrainian enterprises is most influenced gross investment in existing buildings and structures, gross investment in construction and alteration of buildings and gross investment in purchased software.","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134292060","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
Child labour exploitation: politics, law and social attitudes in Georgia 童工剥削:格鲁吉亚的政治、法律和社会态度
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-10-24 DOI: 10.46656/access.2023.4.1(2)
Giorgi Katamadze, L. Tavdgiridze, Maia Bolkvadze
{"title":"Child labour exploitation: politics, law and social attitudes in Georgia","authors":"Giorgi Katamadze, L. Tavdgiridze, Maia Bolkvadze","doi":"10.46656/access.2023.4.1(2)","DOIUrl":"https://doi.org/10.46656/access.2023.4.1(2)","url":null,"abstract":"Respect for human rights and freedoms are regarded to be the key concepts of the civilized world, the protection and integrity of which significantly defines the place and reputation of a country and its government on the international level. The government shall guarantee protection of right to work, yet often both - the public and the private sectors do violate human right to work for various reasons and by different methods. Special attention is indeed deserved by those cases of labor exploitation of juveniles, who are far vulnerable compared to adults and require special care. This paper discusses the following issues: The research is based on the analysis of the results of interviews and surveys with the school pupils from the twelve schools (among them 8 publics and 4 private schools) of Autonomous Republic of Adjara and the respective conclusions and recommendations are represented. It represents an overview of both – local and international legislation on child rights, some data on international and local studies in this regard, statistical information, scientific and theoretical basis of the research and the respective – practically valuable outcomes.","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125081331","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
Amazon Kendra at banking document management system 亚马逊坎德拉银行文件管理系统
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-10-24 DOI: 10.46656/access.2023.4.1(3)
S. Ustenko, T. Ostapovych
{"title":"Amazon Kendra at banking document management system","authors":"S. Ustenko, T. Ostapovych","doi":"10.46656/access.2023.4.1(3)","DOIUrl":"https://doi.org/10.46656/access.2023.4.1(3)","url":null,"abstract":"Electronic document management systems have a great prospect of use in the banking sector, all information stored in electronic document management systems requires further analysis and processing, this involves the use of a machine learning service to build a semantic search result, which implies the presence of a search service with the thinking of artificial intelligence and the ability to provide links clearly reasoned answers. Such a service that satisfies the needs of semantic search is the Amazon Kendra service, the question of using such a service is more relevant than ever for the construction of modern banking products. Under such conditions, an important area of research is to assess the effectiveness of Amazon Kendra in the banking sector, which necessitates the development of a conceptual model for evaluating the effectiveness of banks to make management decisions aimed at improving the efficiency of individual banks and the banking system. Objectives: The purpose of this work is to improve the work of electronic document flow in the banking sector using Amazon Kendra to design an innovative banking product and develop the banking sector of Ukraine. Methods/Approach Scientific research methods – both comparative and analytical – is used in the process of drawing up of this article. Results: A semantic search system based on the bank's electronic document flow system was designed.","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126206607","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
Hybrid application of decision trees, fuzzy logic and production rules for supporting investment decision making (on the example of an oil and gas producing company) 决策树、模糊逻辑和生产规则在支持投资决策中的混合应用(以某油气生产公司为例)
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-09-30 DOI: 10.46656/access.2022.3.3(7)
Maxim Krasnyuk, Iryna Hrashchenko, S. Goncharenko, Svitlana Krasniuk
{"title":"Hybrid application of decision trees, fuzzy logic and production rules for supporting investment decision making (on the example of an oil and gas producing company)","authors":"Maxim Krasnyuk, Iryna Hrashchenko, S. Goncharenko, Svitlana Krasniuk","doi":"10.46656/access.2022.3.3(7)","DOIUrl":"https://doi.org/10.46656/access.2022.3.3(7)","url":null,"abstract":"During the last years, in most countries of Eastern Europe (and Ukraine in particular), even a simple reproduction of onshore hydrocarbon reserves was not ensured. Achieving the possible level of self-sufficiency in fuel and energy resources is a fundamental task of national economies, without which the successful implementation of economic, scientific, technical and social programs aimed at ensuring state independence and stability in Europe is impossible. However, the onshore oil and gas industry of the countries of Eastern Europe with significant volumes of unexplored oil and gas resources, with the cost of oil and gas several times lower than world prices, the presence of a significant number of oil and gas industries, drilling and geophysical enterprises, oil refineries, and an extensive network of oil and gas pipelines , highly qualified production teams allows, with their effective use, not only to stabilize, but also to significantly increase the production of oil, gas and condensate in the future. company: field exploration, their arrangement and development, production and sale of oil and gas. The solution is the application of effective economic-mathematical modeling at the strategic level of management and the use of knowledge-oriented decision-making support tools as an integral component of the complex information system of an oil and gas company. Objectives: Therefore, the issues of: development of a complex system of economic and mathematical support for making fair and timely investment decisions at the macro level of an oil and gas production company, effective application of knowledge-oriented hybrid methods and technologies are becoming particularly relevant. Methods/Approach: The paper uses a mathematical apparatus of the method of fuzzy logic, decision trees, data mining, knowledge-oriented decision support, theory of investment management and expertise in the field of management of oil&gas exploration and production local and international investment projects. Results: first proposed the decision tree diagram of the effective investment management process of a oil and gas company in the search for hydrocarbons in modern economic conditions is proposed; received further development of the principles of hybrid application of intelligent technologies and knowledge-oriented basis and the problem of handling uncertainty while supporting investment decisions of an oil and gas company; first proposed two related prognostic models are proposed: the seismic impact model and a drilling impact model; first proposed two algorithms/models based on economic-mathematical modeling with elements of fuzzy knowledge to support decision-making of the tender&controlling committee of oil&gas production company. Conclusions: Based on the foregoing, it can be concluded that it is efficient to use developed by authors hybrid, knowledge-oriented investment decision support for oil and gas production projects in Ukraine and other countries of Eastern","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"20 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113937334","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
Initial states and transitional expenses in production and transport systems optimization 生产和运输系统优化的初始状态和过渡费用
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-09-30 DOI: 10.46656/access.2022.3.3(8)
A. Kholodenko, V. Gusak
{"title":"Initial states and transitional expenses in production and transport systems optimization","authors":"A. Kholodenko, V. Gusak","doi":"10.46656/access.2022.3.3(8)","DOIUrl":"https://doi.org/10.46656/access.2022.3.3(8)","url":null,"abstract":"The production and transport systems optimization models, as well as classical transport or distributive problems, mainly concentrate on finding of the plan, optimum according to own characteristics, and don't take into account costs on system transition from its given (initial) state to defined as optimum. The neglect of such transitional expenses leads to certain losses of the corresponding models’ adequacy and to obtaining the absolutely-optimal solution, which is invariant to initial system state. In our paper we introduce and investigate the notion of relatively-optimal plans. The basic types of dependences of relatively-optimal plans and maximum achievable profit on the production and transport system initial state under the different functions of transitional expenses are determined. Corresponding computer calculations are also carried out and confirmed our theoretical results and conclusions. From the mathematical point of view, the accounting of initial states and the transitional expenses, on the one hand, complicates the corresponding models and computing processes, however on the other hand – does the models even more interesting, creates additional non-trivial effects.","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126918052","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
Model of ensuring economic security in mechanical engineering 机械工程经济安全保障模式
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-09-30 DOI: 10.46656/access.2022.3.3(6)
O. Redkva, V. Koval, L. Filipishyna, Marina Vuychenko
{"title":"Model of ensuring economic security in mechanical engineering","authors":"O. Redkva, V. Koval, L. Filipishyna, Marina Vuychenko","doi":"10.46656/access.2022.3.3(6)","DOIUrl":"https://doi.org/10.46656/access.2022.3.3(6)","url":null,"abstract":"Industry as a strategic sector of the economy is an important structural element of the economic security of the state, whose performance indicators are a priority for determination of the level of economic development of the country. It forms the foundation for research and technological transformation, economic growth, and social progress in society. The formation of tools for ensuring the economic security of the state based on the improvement of the machine-building complex and the elimination of threats to economic security involves: a) the creation of a centralized system for ensuring the economic security of the state from the standpoint of mechanical engineering; b) the identification of structural imbalances containing a threat to the economic security of the state; c) the development of tools to ensure the economic security of enterprises by influencing the structural imbalances in mechanical engineering at all levels. - assistance in the accelerated development of the economic system, markets and enterprises in the process of global economic transformation, which takes place on the basis of the creation of a new technological basis, the introduction of information technologies and the strengthening of regional and global integration processes.","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123172923","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
Sectoral innovation system of agribusiness in Bulgaria – main challenges and perspectives 保加利亚农业综合企业的部门创新系统-主要挑战和前景
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-09-30 DOI: 10.46656/access.2022.3.3(9)
S. Mileva, T. Georgieva
{"title":"Sectoral innovation system of agribusiness in Bulgaria – main challenges and perspectives","authors":"S. Mileva, T. Georgieva","doi":"10.46656/access.2022.3.3(9)","DOIUrl":"https://doi.org/10.46656/access.2022.3.3(9)","url":null,"abstract":"This paper discusses the importance of public policy and current issues in the context of Agricultural Knowledge and Information System (AKIS) in Bulgaria. The goal is to outline the major challenges and perspectives as basis for analysis of the innovation potential within the sectoral innovation system of the agricultural sector in Bulgaria. Analysed is data about the major stakeholders, international and national programs supporting innovations in the sector, creation of new knowledge and technological solutions, scientific and research activity, state of transfer of technology in the context of agricultural ecosystem. A systematic approach with qualitative monitoring and quantitative assessment are applied for evaluation and definition of the types of effects in the innovation ecosystem. The results confirm, that despite the efforts and funds supporting AKIS, the public policy is not efficient, the stakeholder’s activity is limited, and the innovation and transfer of technology are not enough powerful to drive the economic growth and competitiveness in agriculture. The development of innovation potential should be based on the implementation of policies/addressing of measures that are relevant to the potential of the units of the innovation ecosystem and the priorities for their development. the of the National the Bulgaria - Sustainable Agriculture is set. Reforms related to updating the strategic framework of the agrarian sector in the context of the countries commitments resulting from the SDGs and the Green Deal are foreseen. Farmers should rapidly change their production methods, use nature-friendly, technological and digital solutions to ensure better climate and environmental results.","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"1687 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127451203","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 purpose of the nation 国家的目的
Access Journal - Access to Science, Business, Innovation in the digital economy Pub Date : 2022-09-30 DOI: 10.46656/access.2022.3.3(10)
Jan-Urban Sandal
{"title":"The purpose of the nation","authors":"Jan-Urban Sandal","doi":"10.46656/access.2022.3.3(10)","DOIUrl":"https://doi.org/10.46656/access.2022.3.3(10)","url":null,"abstract":"","PeriodicalId":176153,"journal":{"name":"Access Journal - Access to Science, Business, Innovation in the digital economy","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127395647","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:604180095
Book学术官方微信