104工作快找APP

面試通知不漏接

立即安裝APP

「TPL (Technical project Lead)【Conferencing】」的相似工作

迪芬尼聲學科技股份有限公司
共500筆
10/16
迪芬尼聲學科技股份有限公司電子通訊/電腦週邊批發業
台北市南港區5年以上大學以上
 Project platform HW system design integration  EE Schematic design  PCB layout design and review  RFQ/PRD research and feedback  Component survey and technology study  Bom creation and maintain  EE circuit/system design developing , validation and debugging.
應徵
10/16
迪芬尼聲學科技股份有限公司電子通訊/電腦週邊批發業
台北市南港區3年以上大學以上
【Summary】 We are assembling a world-class acoustics team that will perform research and development of acoustic solutions that provide users with exceptional experiences. We are a team that demonstrates and shares its passion for audio through the innovative platforms and products we develop. We have expertise in audio system design, integration, and manufacturing. We work in a diverse, highly collaborative, cross-functional environment to develop innovative, high quality audio systems for application in home, hearables, conferencing, professional and automotive market segments. We are searching for a System Acoustics Engineer to join our team to develop high quality audio products from concept through to production. 【Key Qualifications】 •Strong background in acoustics industry; Teleconferencing product experience highly preferred •Thorough knowledge in the fundamentals of speaker transducers and microphones. •Understanding and familiar with measurement equipment like Audio Precision, Klippel RD, Soundcheck, etc. •Experience with DSP platforms, including ability to understand HW design & audio DSP signal flows. •Strong analytical capability of acoustic simulation and measurement results •Proven experience in effective communication and presentation skills •Learning attitude with an attention to detail •Excellent teamwork in a dynamic project environment. 【Description】 You will be working with a team of acoustic, mechanical, hardware, software, DSP engineers to develop new audio products and evaluate acoustic performance. This role requires an ability to think critically, work with a hands-on, “get it done” approach. You have strong internal drive, a tenacious spirit, a collaborative method of working, and a deep commitment to delivering innovative solutions, all driven by a core passion for audio. You will be a fluent Mandarin and English speaker, able to converse freely in either language.
應徵
10/16
迪芬尼聲學科技股份有限公司電子通訊/電腦週邊批發業
台北市南港區5年以上大學以上
1. 員工關係活動規劃與執行 2. 協助福委會相關事務規劃執行 3. 雇主品牌營造與推廣 4. 教育訓練支援與人才招募支援
應徵
10/16
迪芬尼聲學科技股份有限公司電子通訊/電腦週邊批發業
泰國5年以上專科以上
1. 集團品質管理體系的規劃與整合 *規劃集團ISO 9001/QC 080000/IATF 16949管理體系,確保集團品質體系滿足標準與客戶的要求 *主導跨廠區流程整合,必要時主持會議協助集團流程改善 *提報核准集團年度品質體系內外審與管審評審的排程 *彙整提報年度廠區管理審查結果 *每月匯報各廠區品質體系活動執行狀況,含客戶QMS稽核結果 *定期更新追蹤廠區內外審(含客戶審核)缺失改善與結案 *因應標準或體系需求更新集團品質手冊 *帶領文件管制中心達成年度目標 2. 客戶QMS審核支援 *確認廠區QMS客戶審核準備到位 *必要時出差支援客戶審核活動 3. 品質體系問題的持續改善 *廠區系統面問題彙整,整合解決方案 *監督廠區品質體系議題的持續改善 *內外審(含客戶審核)問題發現的橫向展開與監督 *年度體系持續改善KPI提報與執行 4. 新品質管理體系廠區建置需求的前期規劃 *與業務溝通客戶新的品質體系要求並提供認證時程表 *廠區前期新管理體系需求的規劃,至廠區生產排程確認後交由廠區MQS執行新體系建置
應徵
10/15
昶懋國際股份有限公司精密儀器相關製造業
新北市汐止區5年以上大學以上
韌體團隊開發範疇: 1. 研究電池特性(例如:鋰電池),開發新的電池電瓶分析演算法。 2. 完成電池測試儀器、電池充電器功能開發。 專案執行過程的常態性工作: 1. 使用MCU開發工具及程式語言,主要是C語言。 2. 進行單元功能程式整合。 3. 單元功能程式撰寫及驗證。 4. 撰寫工程規格 / 技術文件 (包含測試計畫)。 5. 韌體版本管控 (Git)。 Our FW team is responsible for: 1. Developing the functionalities of battery diagnosis/charging products. 2. Investigating new diagnosis algorithm for batteries is part of our job. Regular duties in project execution: 1. Use MCU development tools and programming languages, primarily C language. 2. Perform unit function program integration. 3. Write and verify unit function programs. 4. Write engineering specifications / technical documentation (including test plans). 5. Firmware version control (Git).
應徵
10/15
震昇科技企業股份有限公司其他電子零組件相關業
新北市新店區5年以上專科以上
震昇科技因應公司業務擴大規模,增設職務。 希望尋找擁有共同理念的人才一同成長打拼。 到職後職稱:研發專案經理 【職務內容】 1. 理解團隊成員能量並整合、分配部門工作 2. 管控各專案時程進度,確保符合時程及規範 3. 定期彙報,並提出改善建議 4. 跨部門溝通協調 【需求特質】 1. 相關年資5年以上 2. 具備管理經驗 (人數3人以上) 3. 具備自主管理能力,有獨立作業及思考能力 4. 具備團隊精神,內部溝通整合能力 5. 溝通表達能力良好 【需求技能】 1. 具有分析類比/數位電路能力,有使用ORCAD 或 AD 電路圖繪製經驗。 2. 具備Windows以及Linux的安裝/配置能力,有使用Real Time OS的經驗更佳。 3. 熟悉 PCIe,HDMI,USB2.0/USB3.0,Ethernet等等PC常用Protocol,有軍用Protocol(比如1553,VME,VPX等等)使用 經驗更佳。 4. 熟悉C/C++ 以上經驗更佳。 5. 熟悉FPGA開發流程,具有Verilog或VHDL開發經驗更佳。 ※請求職者利用104平台投遞履歷及聯繫,勿於官網留言或撥打公司電話,謝謝※
應徵
10/14
宜鼎國際股份有限公司電腦及其週邊設備製造業
新北市汐止區3年以上大學
因應全球AI應用的發展,公司業務持續成長中,宜鼎國際正在尋找PM人才加入我們的團隊!我們致力於服務我們的顧客與合作夥伴,鼓勵面對面的互動和團隊合作。如果您擁有3~5年工業電腦(IPC)或嵌入式系統產品經理經驗,並對科技產業充滿熱情,誠摯地邀請您加入我們優秀的團隊,親身體驗我們充滿活力的公司文化。 【工作地點】 此職位的辦公室設在交通便利的新北市汐止,距離 捷運南港展覽館站 或 汐止/汐科火車站 或 交流道 僅3-10分鐘車程,大樓就有停車位、Youbike及豐富的公車選擇,讓您的通勤更加便捷。辦公大樓過個馬路就到好市多Costco,中午或下班採買日用品超方便,使您的工作和生活更加平衡。 【工作內容】 負責規劃、執行與交付專案,整合跨部門資源,確保專案達成時程、成本與品質目標,同時維護良好的客戶與內部協作關係 1. 制定專案計畫、時程、預算與資源分配 2. 設定專案目標、里程碑並監控執行進度 3. 建立專案風險控管與問題解決機制 4. 整合研發、產品、行銷、製造、品保、財務等相關部門資源 5.定期召開專案會議,彙整進度與狀態報告 6.處理變更需求與客戶回饋,維持專案順利推進 7.監督專案測試、驗證及最終交付並確保成果符合規格與品質要求 8.支援客戶驗收與後續改善追蹤 9.推動流程改善,提升專案管理成熟度 【我們提供什麼】 在全球AI解決方案與工業級儲存領導品牌的公司中實現自我!在「一群夥伴、一同經營」核心精神中,積極經營自有品牌,與公司一同成長,共享豐厚的發展機會和福利!加入宜鼎國際,一起寫下值得回憶的故事!
應徵
10/16
台北市內湖區1年以上專科以上
1.負責手機, IOT, Drone及工業用相機模組對應客戶的技術窗口。(英文佳) 2.負責專案對內部研發,工程單位, 對外部合作商的專案統籌,協調與指揮。 3.負責新產品及新技術的開發。
應徵
10/14
特雷維科技有限公司電腦軟體服務業
台北市信義區5年以上大學以上
【職缺描述】 1、市場與競品研究:系統性分析競品商業模式、用戶行為與產品體驗,結合市場趨勢提出差異化優化方案。 2、需求定義與文檔撰寫:基於商業目標,進行需求分析與優先級排序,撰寫清晰可執行的 PRD 文檔,推動跨部門理解與落地。 3、核心框架設計:設計遊戲核心玩法框架與功能結構,輸出 wireframe、流程圖,確保設計符合用戶行為邏輯與商業需求。 4、跨部門協作推進:與設計、開發、測試密切協作,主導項目進度與質量管理,解決推進過程中的卡點與問題。 5、產品數據分析與成效驗證:監控產品核心指標,深入分析用戶行為與產品表現,提出具體的優化迭代方案。 6、產品迭代與版本管理:根據市場變化與運營目標,制定產品版本迭代計劃,推動功能完善與體驗提升。 7、策略提案與營收思維:具備成本估算與營收預測能力,提出可落地的產品方案,協助公司實現增長與用戶價值最大化。 【職務需求】 1、產品知識:具備從 0 到 1 的產品成功上線案例,熟悉概率類遊戲,精通桌台、BINGO、Slot 等任一品類,了解東南亞市場用戶偏好與文化特性。 2、產品策劃與設計經驗:5 年以上互聯網產品策劃經驗,3 年以上遊戲產品設計經驗,能獨立主導產品模組設計與落地。 3、UX 與美術能力:具備良好審美與用戶體驗設計能力,能獨立產出高品質 wireframe、分鏡圖與概念設計稿。 4、數據分析能力:熟悉主流數據分析工具,能基於數據提出可執行的產品優化方案,並追蹤驗證。 5、市場敏銳度:持續關注行業趨勢與用戶行為變化,能提出創新玩法與策略,打造差異化產品價值。 6、敏捷開發理解:熟悉敏捷開發(Scrum、Kanban)流程,能快速響應變化並推動產品節奏。 7、工作態度:具備強執行力與 Ownership,能適應快節奏環境並保持高度彈性。 【加分項目】 1、英語口說能力精通。 2、具備東南亞用戶使用者分析能力。 3、Figma 製作 prototype 設計能力。 4、有 live game 開發經驗。 5、有製作過直播遊戲、區塊鏈、互聯網小遊戲系統經驗。 6、擁有 PMP 或 CSM、CSPO 證照。 接受出差最為優先。
應徵
10/16
迪芬尼聲學科技股份有限公司電子通訊/電腦週邊批發業
泰國10年以上專科以上
________________________________________ Job Summary: Manufacturing Quality Manager is responsible for managing and improving quality assurance and quality control processes across the manufacturing operation. This role ensures that products meet internal standards, customer expectations, and regulatory requirements through effective systems, processes, and team leadership. ________________________________________ Key Responsibilities: • Quality System Management: Implement, maintain, and continuously improve the Quality Management System (QMS) in accordance with ISO 9001, IATF 16949 and industry-specific standards. • Quality Control Oversight: Supervise in-process and final product inspections to ensure conformance to specifications. • Root Cause Analysis & CAPA: Lead investigations into quality issues using tools like 5 Why, Fishbone, 8D, etc., and implement corrective/preventive actions (CAPA). • Process Improvement: Drive continuous improvement initiatives using Lean, Six Sigma to enhance product quality and reduce scrap/rework. • Audit Management: Coordinate and manage internal audits and support external/customer audits and certifications. • Documentation and Reporting: Maintain and review quality records, inspection reports, and control plans. Generate regular reports on quality metrics and KPIs (e.g., PPM, defect rates). • Supplier Quality: Collaborate with procurement and suppliers to ensure incoming material quality; manage supplier audits and corrective actions. • Customer Interaction: Handle customer complaints and quality-related inquiries, ensuring effective resolution and communication. • Training & Development: Train production and quality teams on quality procedures, tools, and compliance requirements.
應徵
10/14
台北市南港區5年以上專科以上
Technical Program Manager Responsibilities: ★ Collaborates with internal and supplier stakeholders to plan and execute an optical image technology development program for the launch of Hybrid Systems products. ★ Leads moderate to high complexity projects, delivering professionally written reports,and supports the realization of operational and strategic plans. ★ Understands the technical concepts, architecture, systems, development methods, and disciplines associated with the defined program, and utilizes knowledge to accelerate project completion. ★ Applies continuous improvement practices for program processes intended to optimize program execution within and across program workstreams. ★Develops schedules, risk assessment and mitigation, critical deliverables, budget, logistics, and other support requirements for assigned program in collaboration with both the company & strategic partner teams. ★Coordinates activities of supporting project teams and internal and external development partners; tracks progress against established plan and informs decisions regarding schedule, cost and scope to meet product requirements and development schedule. ★ Ensures program stakeholder engagement through clear communication plans, communicates program information in a timely manner and manages escalation of issues, drives quick resolution and produces solutions. ★Assesses and reports changes to the program plan or deliverables, develops change review summaries; ensures stakeholder buy-in and alignment prior to change implementation. ★Solves difficult and complex problems with a fresh perspective, demonstrating good judgment in selecting creative solutions and managing projects independently. ★ Provides program leadership and guidance for less-experienced staff members. Education & Experience Recommended ★Education: Bachelor’s degree in a technical field, business marketing, or a related field. Having a MBA or relevant technical degree is a plus. ★Experience: 5+ years of experience in technical program management, product management; experience with camera technologies and/or experience in immersive technologies is preferred. ★ Technical Expertise: Strong understanding of technical product development, including familiarity with complex hardware and software systems. ★ Project Management Skills: Proven experience managing cross-functional teams for product launch, preference for PMP certification or Agile certification. ★ Analytical Skills: Ability to develop annual budget, manage forecast, assess impact of change to the camera program plan and related workstreams. ★Communication: Exceptional verbal and written communication skills, with the ability to translate technical concepts for non-technical audiences. ★ Problem-Solving: Strong problem-solving and critical-thinking abilities; comfortable navigating ambiguity and solving complex challenges. ★Agility: Balance multiple priorities effectively and adapt to change quickly. Preferred Certifications ★ PMP Knowledge & Skills ★ Agile Methodology ★Change Management ★ Continuous Improvement Process ★ JIRA • Milestones (Project Management) ★ New Product Development ★ Process Improvement ★ Project Management ★Project Schedules ★ Risk Management Cross-Org Skills ★ Effective Communication ★ Results Orientation ★ Learning Agility ★Digital Fluency ★ Customer Centricity Impact & Scope ★ Impacts multiple teams and may act as a team or project leader providing direction to team activities and facilitates information validation and team decision making process. ★ Responds to moderately complex issues within established guidelines. Disclaimer ★ This job description describes the general nature and level of work performed in this role. It is not intended to be an exhaustive list of all duties, skills, responsibilities, knowledge, etc. These may be subject to change and additional functions may be assigned as needed by management.
應徵
10/15
台北市內湖區10年以上大學以上
1.需具備10年以上半導體封裝或電子元器件封裝領域從業經歷,熟悉封裝全流程技術細節,包括但不限於引線鍵合、倒裝焊、晶圓級封裝、系統級封裝(SiP)、功率器件封裝等主流工藝,瞭解不同封裝形式的技術特點與應用場景,全新產品開發(製圖、框架設計、耗材新開發、全新封裝設備評估、無到有) 2.需擁有 10年以上研發團隊管理經驗,曾帶領 20人以上 RD 團隊開展工作,具備團隊組建、人才梯隊建設能力,能根據專案需求合理分配人力,制定清晰的團隊發展規劃,培養核心技術骨幹。 3.熟悉研發專案管理方法論,能主導從專案立項、需求拆解、方案評審到測試驗證、量產交付的全流程推進,具備跨部門協作能力(如與生產、採購、品質部門對接),確保研發目標按時達成。
應徵
10/15
神準科技股份有限公司通訊機械器材相關業
台北市南港區3年以上大學以上
1.負責與廠商/客戶討論Camera相關規格 2.光學設計、光學元件選擇及驗證 3.產品影像品質驗證與參數調整 4.擬定測試計畫、評估設備需求 5.協助工廠架設進料檢驗及影像品質驗證
應徵
09/17
羅技電子股份有限公司電腦及其週邊設備製造業
新竹市10年以上大學以上
The Role: The Logitech G team is looking for a Sr. Technical Project Manager to manage gaming product development across different product categories from concept through mass production. The ideal candidate is a highly organized and detail-oriented hardware and associated system software project /program manager with a proven record of delivering best-in-class products on time and on budget. The successful candidate will thrive working closely with engineering and manufacturing, and excel at managing a global, cross-functional team. The candidate should be able to manage and support multiple project execution tasks with a hands-on approach that ensures a high degree of personal interaction with the process. Your Contribution: • Manage and coordinate New Product Introduction (NPI) development through the product life cycle process from concept to product delivery, applying project management standards. • Partner with Product Management, Engineering, Supply Chain, and Manufacturing to deliver projects on time within defined expectations in terms of experience, cost, and quality. • Collaborate with Product Management, Design, Engineering, and Operations to explore and deliver the technical bricks for the needs of the roadmap. • Create risk management lists and contingency plans. Decide upon and execute contingency plans, when required. • Report and communicate regularly; escalate when project goals are at risk. This includes regular reporting of project status to key stakeholders, Business Group (BG) directors through management review meetings and Gate meetings as prescribed by internal development processes. • Build strong relationships with our key partners and stakeholders such as Design, OPS, and Business. • Identify with business counterparts innovation pillars, ingredients, and technologies required to fulfill the development of future roadmap - supervise the agreed plan. • Collaborate with Managers to improve project organization, efficiency (tools, processes), and time to market. Ensure that project activities operate within the policies and processes of the organization.
應徵
08/05
優比快股份有限公司電子通訊/電腦週邊批發業
台北市信義區6年以上碩士以上
About Ubiquiti At Ubiquiti Inc., we create technology platforms for Businesses, Smart Homes, and Internet Service Providers, driven by our goal to connect everyone, everywhere. To date, Ubiquiti has shipped over 100 million devices worldwide, from ISP networking products to the next generation of IT solutions. Our growth is made possible by the dedicated team of hundreds behind the scenes. From software developers and product managers to designers and strategists, Team UI is driven to achieve our common goal: Rethinking IT. At Ubiquiti, you’ll heighten your potential and broaden your horizons, all while shaping the future of connectivity. Role Summary As a Hardware Engineer at UI, you will be responsible for the electrical design of consumer electronic products. We are looking for candidates who thrive in a fast-paced start-up-like environment. In this role, you will be the owner of all aspects of EE hardware design, including circuit/board design and validation. To be successful, you need to be highly motivated and detail-oriented while showing the highest standards of responsibility. Responsibilities - Design UI’s future products by owning architecture selection, electrical design, and validation. - Direct and review PCB layout and electrical simulation teams. - Design validation: complete functional verification, signal characterization, power modeling/test, and system coexistence testing. - Troubleshoot, debug, and resolve issues during development, including factory prototype builds. - Bring your design to mass production by setting factory test requirements and assisting in software bring-up. Minimum Qualifications - BS degree in electrical engineering or related field - 5+ years of hands-on experience in consumer electronics/embedded systems design, prototyping, bringing up, debugging, functional verification, and NPI support, DFx (Design for cost, test, manufacturing) experience - Experience with Cadence OrCAD, Allegro, PADS, or equivalent. - Electrical engineering or design experience in one or more of these areas: SOCs/MCUs, -- Power Management, Signal Integrity, and/or Analog/RF. - Knowledge of PoE converters, DC/DC converters, power management methods, audio circuit design, high-speed, and analog circuit design - Knowledge of processor architecture, digital circuit design, and various communications protocols such as I2C, UART, SPI, Ethernet, and USB, etc. - Knowledge of developing robust designs for ESD, EMI immunity, and RF Desense. - Ability to be hands-on in the lab and want to be in the details (soldering, oscilloscopes, data acquisition). - Team player with good communication skills Preferred Qualifications - Master's degree in electrical engineering or related field. - Knowledge of high-speed digital interfaces such as PCIe, DDR3/4, MIPI, LVDS, etc. - Experience with analog design, low power design, audio acoustics, various RF technologies (such as WiFi/BLE/ Zigbee/NFC) - Experience with physical characterization of sensors such as light sensors, ToF sensors, Temperature sensors, Radar sensors, G-sensors, etc.
應徵
10/13
艾訊股份有限公司電腦及其週邊設備製造業
新北市汐止區5年以上專科
你將在高速成長的網通產品事業單位中,扮演關鍵技術領導角色,負責Server主機板的核心設計與研發,推動創新並打造高效能解決方案。 職務內容: 1. Server主機板電路設計:主導高效能主機板的電路架構設計、原理圖繪製與Layout指導,確保設計品質與效能。 2. 技術領導與設計審查:擔任專案技術負責人,引領設計方向、進行技術審查與風險控管,確保專案技術決策正確。 3. 產品驗證與技術問題解決:負責產品功能驗證、測試與故障排除,持續提升產品穩定性與可靠度。 4. 商品化與設計優化:推動產品從設計到量產的轉化,並持續優化設計以提升品質、降低成本。 5. 專案管理與預算控管:掌握專案進度與資源分配,有效控管開發成本與預算,確保專案如期達標。 【我們在找的人】 一位對技術充滿熱情、具備深厚硬體設計經驗的工程師,渴望在Server領域發揮影響力。這個職務不只是執行者,更是技術的引領者,能夠在複雜挑戰中找到創新解法 *彈性工作時間,薪優福利佳,並備有新店/中和線交通車*
應徵
09/22
台北市松山區經歷不拘專科以上
Canonical is a growing international software company that works with the open-source community to deliver Ubuntu, “the world’s best free software platform”. The Commercial Engineering Quality Assurance (QA) team works with all the engineering teams in Canonical, OEM and ODM customers, to bring Ubuntu directly to millions of users by delivering certified Ubuntu laptop, desktop, IoT and other computing devices. As a Software Engineer - Quality Assurance, you will join the team responsible for our strategy for quality coordination and testing. You will be a quality expert with extensive experience establishing quality processes from the ground up. You will understand the tools and techniques used to introduce new products, and will work with teams across the company to drive quality improvements through the entire development cycle. As a Software Engineer - Quality Assurance you will: .Plan, create, and manage the overall Quality Planning strategy and document .Improve our automated test capability with design and code contributions .Perform automated and manual testing of Ubuntu Desktop, Server and Core on varies latest hardware. .Suggest solutions to identified product problems .Collaborate with the Project team to ensure consistent project execution .Identify quality assurance process bottleneck and suggest improvements .Oversee continuous improvement projects  .Collect quality data .Establish proactive measures to improve the quality and reliability of the Ubuntu platform .Prepare time estimates and schedule for testing activities .Identify, isolate, and document bugs clearly and concisely in the bugs database .Work with development teams across multiple projects to build efficient, effective automated testing .Communicate effectively with colleagues in a variety of time zones around the world .Triage test reports and customer bugs The successful Software Quality Assurance Engineer will have : .Experience with the Linux desktop, and related technologies. Ubuntu experience would be a plus .Solid grasp of commercial Software QA practices and ideas on how to integrate them into Linux Community standards .Experience with common scripting languages, including Shell script, Python or JavaScript .Comfortable with online communication and collaboration such as mailing lists, Mattermost, wiki .Excellent logic, problem solving, and troubleshooting skills .Strong written and spoken communication skills in English .Ability to be productive in a globally distributed team .Ability to pick up new technologies and achieve high effectiveness quickly Canonical is an equal opportunity employer We are proud to foster a workplace free from discrimination. Diversity of experience, perspectives, and background create a better work environment and better products. Whatever your identity we will give your application fair consideration.
應徵
10/14
台北市大安區經歷不拘大學以上
1. 檢查並協助客戶通過各項功能安全認證 2. 協助客戶整合各項標準(見下方:其他條件說明),取得證照為佳 3. 國際功能趨勢與標準宣導 4. 檢驗前後測分析 5. 客戶提問解答 此職務到職後,前期將會由Mentor帶領,從時程安排、了解客戶需求,到陪同客戶端服務,Mentorship後會接受各項專業規範培訓。
應徵
10/16
迪芬尼聲學科技股份有限公司電子通訊/電腦週邊批發業
台北市南港區3年以上大學以上
1. 耳機或是聲音相關產品電路設計 2. Layout review以及產品設計debug 3. 產品產測相關討論 4. 需要可以配合出差大陸以及泰國
應徵
10/16
華德動能科技股份有限公司汽車及其零件製造業
桃園市大園區3年以上專科
主要負責整合與優化電動車系統 1.整車控制器驗證 2.實車問題點解析 3.實車問題點對策 4.研發相關文件建立
應徵