Journal of Artificial Intelligence and Engineering Applications (JAIEA)最新文献

筛选
英文 中文
Design of a Web-Based Fleet Management Information System at PT Qtrans 在 PT Qtrans 设计基于网络的车队管理信息系统
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-12 DOI: 10.59934/jaiea.v3i3.498
Syaifur Rahmatullah, Abdul Rojak, Andy Setiyawan, Irmawati
{"title":"Design of a Web-Based Fleet Management Information System at PT Qtrans","authors":"Syaifur Rahmatullah, Abdul Rojak, Andy Setiyawan, Irmawati","doi":"10.59934/jaiea.v3i3.498","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.498","url":null,"abstract":"The development of technology is currently very rapid and has an important role as a basic need in life. Technological sophistication is a force that helps the smooth running of work and business processes. In some companies, there is fleet management which is an operational activity in sending or receiving goods. For this reason, the use of information technology is needed to manage this fleet. In this case, PT. Qtrans still lack of visibility and supervision, and there is no effective fleet monitoring and tracking system because Microsoft Excel still used to record the data. The data analysis reports on fleet management are still manual and do not support the fleet maintenance and maintenance process. The system development model carried out in this study uses the prototype method model. The application of a website-based fleet management information system is expected to make it easier for administrators to monitor and manage fleets at PT Qtrans.","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"135 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141351413","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
Integrating Heuristic Evaluation and Think-Aloud Protocols By Applying Nielsen’s Metrics on Indonesian e-Pangan Application 将启发式评估与 "大声思考 "协议相结合,在印度尼西亚电子攀岩应用中应用尼尔森指标
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-12 DOI: 10.59934/jaiea.v3i3.508
Rahma Fitria, Cut Meurah Nurul ‘Akla, Rini Meiyanti, Nova Kartika, Rifqa
{"title":"Integrating Heuristic Evaluation and Think-Aloud Protocols By Applying Nielsen’s Metrics on Indonesian e-Pangan Application","authors":"Rahma Fitria, Cut Meurah Nurul ‘Akla, Rini Meiyanti, Nova Kartika, Rifqa","doi":"10.59934/jaiea.v3i3.508","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.508","url":null,"abstract":"Usability testing has emerged as one of the most important aspects of software testing to provide high-quality software to users. The purpose of this study is to evaluate the usability of an Indonesian mobile government application known as e-pangan. Because of the growing number of mobile phone users, the government has deployed mobile applications to make it easier for people to obtain information. Unfortunately, mobile government is not user-friendly and still has a lot of issues, as evidenced by user reviews in the Google Play store. The study employed a hybrid usability methodology that included heuristic evaluation and think-aloud protocols. The mobile government application Panel Harga Pangan will be tested to represent the study of this testing. Furthermore, the heuristic evaluation is performed by a usability expert, while the think-aloud protocols are performed by ten users. Nielsen's metrics are applied to measure the learnability, efficiency, memorability, error rate, and satisfaction of the application. The results of the research show that the application has an average score of 66%, indicating that while some users might discover it challenging others might discover it to be straightforward. This research is expected to be beneficial for usability practitioners or developers to develop a user-friendly e-government application.","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"124 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141351694","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
Implementation of Mechanical Learning Simple Linear Regression Accuracy Level of Mobile Legend Game Addiction for STMIK Kaputama Students 为卡普塔玛 STMIK 学生实施机械学习简单线性回归移动传奇游戏成瘾的准确度水平
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-12 DOI: 10.59934/jaiea.v3i3.500
Gusti Prahmana, Meri Nova, Marito Br Sipahutar, Ade Linhar, Kristina Annatasia, Br Sitepu, Selfira, Stmik Kaputama
{"title":"Implementation of Mechanical Learning Simple Linear Regression Accuracy Level of Mobile Legend Game Addiction for STMIK Kaputama Students","authors":"Gusti Prahmana, Meri Nova, Marito Br Sipahutar, Ade Linhar, Kristina Annatasia, Br Sitepu, Selfira, Stmik Kaputama","doi":"10.59934/jaiea.v3i3.500","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.500","url":null,"abstract":"This study aims to apply the Simple Linear Regression algorithm in measuring the accuracy of the addiction level of the Mobile Legend game based on the GAS (Game Addict Scale) scale. GAS is a scale used to assess a person's level of gaming addiction, which consists of several scoring items with various indicators of addiction. In this study, data was collected from a group of respondents who had filled out the GAS questionnaire. The value of the GAS scale is used as an independent variable (X) and the level of addiction to the Mobile Legend game is used as a dependent variable (Y). The method used is Simple Linear Regression, where a model will be developed to predict the level of addiction based on the GAS scale. The collected data is divided into two sets: a training set and a test set. The model is built using a training set and then tested using a test set to evaluate its accuracy. The results show that the Simple Linear Regression model is able to provide a fairly accurate prediction of the level of addiction to Mobile Legend games based on the GAS scale. Accuracy evaluations are performed using metrics such as Mean Squared Error (MSE) and R-squared (R²). The evaluation results show that the model has a low MSE value and a high R² value, which indicates that the independent variable (GAS scale) has a significant linear relationship with the dependent variable (Mobile Legend game addiction level). The Simple Linear Regression Algorithm can be used as an effective predictive tool to measure the level of game addiction based on the GAS scale. This research contributes to understanding the relationship between the GAS scale and game addiction, as well as opens up opportunities for further research in developing more complex and accurate prediction models.","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"110 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141352137","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
Quality Analysis of SMA Negeri 1 Sokaraja Website using Eye Tracking Method 使用眼动跟踪法对 SMA Negeri 1 Sokaraja 网站进行质量分析
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-11 DOI: 10.59934/jaiea.v3i3.496
Purnani Khaniifah, Muhamad Azrino Gustalika
{"title":"Quality Analysis of SMA Negeri 1 Sokaraja Website using Eye Tracking Method","authors":"Purnani Khaniifah, Muhamad Azrino Gustalika","doi":"10.59934/jaiea.v3i3.496","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.496","url":null,"abstract":"The role of websites in academic management and enhancing the reputation of a company or institution is very important. The quality of website services also has a crucial role in the world of education. Based on the results of interviews with the person in charge of the SMA Negeri 1 Sokaraja website, it was found that there were problems, namely the satisfaction of website users was not yet known and there were several pages that were not responsive, such as in the homepage/home area, which needed to be improved or optimized. This research involves a number of respondents who will give their views on the SMA Negeri 1 Sokaraja website. The analysis results obtained from this research are expected to provide a clear understanding of the extent to which this website meets the quality standards set by the Eye Tracking method. In addition, the analysis results will also provide a detailed evaluation of each aspect of the website's quality. In this research, the Eye Tracking method is used to measure where users look, how long they look, and the order in which they look. There are aspects of usability measurement, namely efficiency, effectiveness and satisfaction. SMA Negeri 1 Sokaraja website users are the respondents of this research. The results of usability testing with the USE Questionier method with a feasibility percentage of 84.17% with a very feasible category which means the website is very feasible for users. The results of usability testing with the eye-tracking method that each task is well received by users, but the effectiveness of delivering information reaches a score of 73.14, this score is classified as quite effective","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"34 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141358988","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 and Design of Inventory, Purchase, and Sales Information System at UD. Dicky UD 库存、采购和销售信息系统的分析与设计。迪克
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-10 DOI: 10.59934/jaiea.v3i3.493
Agnes Rebecca Tambunan, Juin Frandi Sinurat, Salsalina Br Sembiring, Tri Wulandari Ginting
{"title":"Analysis and Design of Inventory, Purchase, and Sales Information System at UD. Dicky","authors":"Agnes Rebecca Tambunan, Juin Frandi Sinurat, Salsalina Br Sembiring, Tri Wulandari Ginting","doi":"10.59934/jaiea.v3i3.493","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.493","url":null,"abstract":"Technology is currently developing rapidly, so every business such as sales needs to implement an information system. UD.Dicky is a business that operates in the field of selling basic necessities in the form of rice, edible oil, sugar and other necessities located at Jl. Captain Muslim No.120, Dwi Kora, Kec. Medan Helvetia, Medan City, North Sumatra 20123. The problem with the ongoing business process at UD.Dicky is that there is no processing and storage of data on sales, purchases and inventory of goods so that errors often occur in recording transactions carried out and also making reports. The methodology used is SDLC (System Development Life Cycle). The results obtained from this research are a sales, purchasing and inventory information system design, if continued to the system development stage it can be used as a basis for developing the proposed system","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"120 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141362671","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
Determining Talent Based On Skills Students Use Fuzzy Logic 利用模糊逻辑根据学生技能确定人才
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-05 DOI: 10.59934/jaiea.v3i3.471
Kristina Annatasia, Br Sitepu, A. M. H. Pardede, Stmik Kaputama
{"title":"Determining Talent Based On Skills Students Use Fuzzy Logic","authors":"Kristina Annatasia, Br Sitepu, A. M. H. Pardede, Stmik Kaputama","doi":"10.59934/jaiea.v3i3.471","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.471","url":null,"abstract":"In order to actively develop students' potential for spiritual and religious strength, self-control, intelligence, noble morals, and the skills required by themselves, society, the country, and the state, education is a deliberate and planned endeavor. Learning is commonly understood to be the changes that come about in a person as a result of their experiences rather than as a result of their physical development or innate qualities. in order for them to comprehend and be aware of the finest ways to advance their potential, knowledge, abilities, and skills. Talents can be used to assist attain success in school and in the workplace because they are relatively stable. Therefore, it may be claimed that talent indicates a person's capacity to pick up a certain skill, talent varies substantially, and talent remains relatively constant. The value of fuzziness or vagueness between true and untrue is what fuzzy logic is. Fuzzy logic is typically applied to situations involving noise, uncertainty, imprecision, and other similar elements.","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141382773","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
Nutritional Analysis Of Traditional Indonesian Food Using Machine Learning 利用机器学习分析印尼传统食品的营养成分
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-05 DOI: 10.59934/jaiea.v3i3.476
Federico Anggito Ryseno, Fito Mardianto, Yoga Prasetyo Wibowo, Faishal Nugraha, Eka Kusuma Pratama
{"title":"Nutritional Analysis Of Traditional Indonesian Food Using Machine Learning","authors":"Federico Anggito Ryseno, Fito Mardianto, Yoga Prasetyo Wibowo, Faishal Nugraha, Eka Kusuma Pratama","doi":"10.59934/jaiea.v3i3.476","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.476","url":null,"abstract":"This research aims to analyze the nutritional composition of traditional Indonesian food using the clustering method. Nutritional data from 1,346 types of Indonesian food, including calories, protein, fat and carbohydrates, was analyzed with the help of RapidMiner Studio. The clustering results produced three main clusters: (1) foods low in nutrients, (2) foods high in nutrients, and (3) foods with moderate nutrients. Through statistical analysis, variations were found in the number of foods with certain nutritional values in each attribute. This research provides better insight into the nutritional composition of traditional Indonesian foods that are frequently consumed by the public. It is hoped that the results of this research can help individuals choose foods that suit their body's needs, as well as contribute to encouraging a healthier lifestyle in society.","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"56 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141384072","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
Implementation Of the C4.5 Algorithm With The Backward Elimination Feature Selection For MSME Product Sales Strategy 采用后向消除特征选择的 C4.5 算法实施中小微企业产品销售战略
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-05 DOI: 10.59934/jaiea.v3i3.491
M. Rudi Fanani, Elvinda Bendra Agustina
{"title":"Implementation Of the C4.5 Algorithm With The Backward Elimination Feature Selection For MSME Product Sales Strategy","authors":"M. Rudi Fanani, Elvinda Bendra Agustina","doi":"10.59934/jaiea.v3i3.491","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.491","url":null,"abstract":"The development of Micro, Small and Medium Enterprises (MSMEs) in Indonesia has become a major focus in advancing the economy, reducing poverty and improving community welfare. MSMEs not only play a strategic role in creating jobs and driving the local economy, but are also a source of inspiration for innovation and creativity. Kedungwuni Timur sub-district is an area in Kedungwuni sub-district, Pekalongan Regency, Central Java. The profession of the majority of Kedungwuni Timur Village residents is operates in the MSME Fashion sector. The current problem is that consumers can easily compare products. Therefore, it is necessary to carry out a sales strategy by utilizing Information Technology concepts, one of which is using Data Mining techniques. The C4.5 algorithm is a data mining algorithm that is used to predict the sales strategy for MSME products with an accuracy value of 82.78%. To increase the accuracy value, the backward elimination feature was used to produce an accuracy of 85.00%.","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"85 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141385316","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
Optimization Of Sandal Production Using Linear Programming 利用线性规划优化桑德拉生产
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-05 DOI: 10.59934/jaiea.v3i3.470
Muammar Khadapi, S. Ramadani, Stmik Kaputama
{"title":"Optimization Of Sandal Production Using Linear Programming","authors":"Muammar Khadapi, S. Ramadani, Stmik Kaputama","doi":"10.59934/jaiea.v3i3.470","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.470","url":null,"abstract":"In order to maximize income and minimize material costs, sandal manufacture involves other operational expenditures in addition to raw material costs that must be calculated. The goal of this study is to maximize earnings by optimizing sandal production costs, with a focus on the Diona Shoes home sector. By identifying the restrictions and inequalities present in the linear program, you can utilize linear programming to solve production cost optimization challenges. The simplex method is a technique for solving linear programming problems that involve numerous inequalities and variables by doing iterative calculations until the most optimal solution is found. The simplex approach (iteration) of production result optimization, data collection and observation, mathematical model creation, production result optimization employing Lindo software tools that are anticipated to yield results, and production result optimization are the stages taken to optimize overall production costs. optimally with the lowest possible manufacturing costs for sandals with heel, pansus, and back straps and can optimize the earnings from all sandal goods","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"54 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141383113","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
Designing a School Information System and Admission of New Students at Gunadarma Middle School Based on a Website Using the Protoype Method 使用原型法设计基于网站的学校信息系统和 Gunadarma 中学的新生录取工作
Journal of Artificial Intelligence and Engineering Applications (JAIEA) Pub Date : 2024-06-05 DOI: 10.59934/jaiea.v3i3.485
Muhammad Rayhan Erzha, Muhamad Abdul Halim Halim, Arfa Azka Santosa, Maulana Imran Ravasia, Eka Kusuma Pratama
{"title":"Designing a School Information System and Admission of New Students at Gunadarma Middle School Based on a Website Using the Protoype Method","authors":"Muhammad Rayhan Erzha, Muhamad Abdul Halim Halim, Arfa Azka Santosa, Maulana Imran Ravasia, Eka Kusuma Pratama","doi":"10.59934/jaiea.v3i3.485","DOIUrl":"https://doi.org/10.59934/jaiea.v3i3.485","url":null,"abstract":"The school information system and registration of new students at Gunadarma Middle School is currently still manual and seems traditional. This causes the process to be slow, inefficient, and prone to errors. This requires a webdite-based information system that can help schools manage school information system and new student registration using the prototype method. The prototype method was chosen because it makes it possible to develop the system quickly and iteratively, so that a system can be obtained that suits the user’s needs. The system designed will have several main features. Allows perspective students to register online by filling out the registration form and upload the required documents. The latter produces statistical reports on the number of students and selection results. This system is expected to increase efficiency and effectiveness in managing school information and new student registration.","PeriodicalId":320979,"journal":{"name":"Journal of Artificial Intelligence and Engineering Applications (JAIEA)","volume":"43 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141383236","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