Digital Signal Processing

Welcome back to Codeaholics! We will kickstart our 2026 collaborating with ExpressVPN! **Talk#1: The Pain of Processing PDFs** by **Angus Cheng** Reading PDFs is very difficult, here's what I've learnt over the last five years running a SaaS that processes PDFs **Talk#2: Why does ExpressVPN switch from C to Rust for Lightway’s code?** by **Thomas Leong** We built Lightway from scratch in a quest to offer a VPN protocol that serves the needs of VPN users in a modern, mobile world—one that’s fast, secure, and reliable. Since launching Lightway five years ago, we’ve had it open-sourced and audited, as well as implementing key upgrades. We have just rolled out a new version of Lightway to users—one that sees our pioneering VPN protocol rewritten in Rust programming language. For this technical talk, we wanted to take a moment to discuss some of the more technical reasons behind the changes we’ve made and dive into the benefits of Rust over C, the language we originally used for Lightway code.

Dear Toastmasters & guests, *Theme of the meeting: “Creativity” Please note that our **venue** is at: **20/F, Cubus, 1 Hoi Ping Road, Causeway Bay, Hong Kong** (Causeway stn exit F1 Jardine's Crescent 渣甸坊, 5-10 minutes walk to Cubus which is opposite to Lee Garden 3) Do you want to **improve your communication skills (both speaking and listening) in English** in your daily life? We have *prepared and impromptu speeches* in English during the meeting. **Evaluation** of the speeches will be given so that the speakers can *improve* their speeches continuously. Do come and enjoy the warm atmosphere and have a wonderful learning experience together with us! **All are welcome. *No guest fee is required.*** **See you then!**

🧧新春開年飯活動🧧 《第二組 豐衣築食吃喝會》 [2702 金牌九大簋開年飯@六安居]🧧🍽️ 日期：2月27日(五) 時間：1930-2200 飯店：上環六安居(蓮香居舊址) 消費：每位$318(宴席$3680） Event fee :$10/位(已包括） 人數：12位/席 訂位：齊人訂枱付訂 Host: CC ⭐️金牌九大簋Menu(12道菜)⭐️ ⭐️金錢雞錦繡大拼盤 ⭐️川貝杏汁燉白肺 ⭐️蓮香霸王鴨 ⭐️黃金煱大虎蝦 ⭐️生煎蓮藕餅 ⭐️泮水芹香 ⭐️翡翠彩鳳蚌片 ⭐️生炆龍躉翅 ⭐️馳名貴妃雞 ⭐️飄香荷葉飯 ⭐️蟠桃壽包 ⭐️蓮蓉焗西米布甸 (奉送啤酒大樽裝2支，細啤4支加$68可買紅酒1支) 💰價錢💰 1席：$3680/12位(已包茶芥/加一)+event fee 每位$10 平均每位$318/位 ❇️付款方法❇️ (每位參加者入組前,需全付$318位) ⭐️入群前，host會通知你付款方法 ⭐️付款後, 請通知& whatsapp CC入數留收據, 才能入臨時群⭐️ ⭐️歡迎當日早到/遲到/早退，不歡迎突然飛機友，付款後如未能參加，必須要搵到群組成員代替出席，不設退款。 ⚠️溫馨提示：～ 1.歡迎成員邀請朋友參加 2.不歡迎臨時消失飛機友，當成員付款後，如未能出席，自找成員頂位，不設退款，故此考慮清楚報名參加活動！如真正未能出席，請自動自覺退組，在meetup轉“not-going。 3.若發現成員經常性臨時飛機友，會列入黑名單，望成員尊重自己，尊重本組活動。 4.Host有最終活動決定權。 (六安居資料）:~ 網址: https://s.openrice.com/QrbS04ti000~uAyTUAw 地址: 上環德輔道西46-50號2-3樓 電話: 21569328

#### **Come and play, YAY!** *\*\*Note: ticket must be purchased to attend event, link below. An RSVP does not reserve your place at the jam\*\** An improv jam is a fun inclusive event where absolutely all are welcome, no improv experience required. We all play some improv games together, have some laughs, meet other improvisers and generally be merry. Whether you've taken improv classes before or you will be dipping your toes into improv for the first time, we'll be happy to play with you. **Note:** * Session will start promptly at 7pm, we highly recommend arriving 15 mins early to be ready to begin * This is **not** a show/performance/open mic night - you will be joining as a participant in games * This is **not** a workshop/class - the focus is more on play than learning * Wear something comfortable as you will be moving around * ***Tickets go on sale 1 week prior to event.*** Ticket link ***[here](https://www.eventbrite.com/cc/tbc-jams-1131479?utm-campaign=social&utm-content=attendeeshare&utm-medium=discovery&utm-term=odclsxcollection&utm-source=cp&aff=odclsxcollection)***. $55 online/$70 on the door

**生活中的壓力有時令你喘不過氣？** **身體感覺疲乏，有時覺得連睡眠都解決不了？** **身體有由來已久的痛症，一直無解？** **內心有心結未解，創傷未癒？** * 研究證實，頌缽的共鳴共振，可直達人體細胞深處，促進血液循環，提升自律神經功能，激發人體自癒力 * 運用頌缽音頻和振動調節失衡或淤塞的脈輪，令身心運作回復和諧狀態 * 頌缽的和諧音聲和振動，能直達人體細胞深處，促進血液循環，提升自律神經功能，活化內在能量流動，對身體和心靈進行淨化，從而得到療癒 * 療癒不是消除病症，而是從身、心、靈層面，協助個案找回自己的內在力量，提升其自我修復能力，令其整體狀態變得更好 *療癒開始前，會進行約10-15分鐘的簡短的諮詢，了解客人的具體問題，例如身體哪部份不適，情緒上的困擾等，然後制定個人化的療癒程序。* 首次體驗價：HKD450 (標準價：HKD780) 由於是1對1活動，具體舉行日期和時間以預約為準。 預約請聯絡90356039 (whatsapp)，或RSVP後留下聯絡電話。不設walk-in。

經驗原因也好，人心改變也罷，現在越來越人不滿足於打一份工，可能是希望增加財政來源，改變收入結構。 斜槓族只適用於瀟灑、沒有負擔的年輕一代？還是年紀大了反而會想與時間競賽，勇敢嘗試更多？ 既然有空，不如出來飲杯咖啡，說說你的看法？ 有興趣請聯絡我，WhatsApp 90356039. 期待與你見面聊聊😉

FREE FIRST SESSION IF YOU LIKE OUR IG & FB PAGE \- www\.instagram\.com/deedreamlife \- www\.instagram\.com/deedreamlife\.hk \- www\.facebook\.com/deedreamlife HKD200 per session HKD1800 for 10 prepaid HKD3200 for 20 prepaid WhatsApp 63344266 to register Dee Dream Life 1 Lyndhurst Terrace, Central 14/F, 1401 Our signature class that makes this the top rated Zumba class in HK according to Sassy Hong Kong for many years! Dance to amazing fun rhythms including Latin, Hip Hop. Pop, Funk, Bollywood and more while dripping in sweat and feeling fantastic! Lose weight, burn calories and raise your vibrations with this super uplifting class! Enjoy yourself and feel completely refreshed and energised after a workout! This class is more intense that most other dance fitness classes in town, be ready to sweat and have a proper workout! Easy to follow with repetitive moves, no need to memorise steps and open to all levels including complete beginners to dance and fitness :) At night, we dance to disco lights making this class the party you need to loosen up after a long day at work! Come and enjoy music, movement and fitness like you have never before!

LSS Smart Fitness 律動班系列 Wed/Sun $100/ 1-hr class ($350 /4-class) Please RSVP one week in advance Welcome to book other time slot (WhatsApp 65230389) Vibration x MFR 療癒律動 (Relax, Muscle release & Facial massage) Vibration Fitness (Stretch & Strength) 健體律動 Vibration x BellyFit 美型律動 (Body Shape-up with Bellydance Technique Drills) Vibration x Yoga 律動瑜伽 (Yoga Asana in vibration setting) https://eshop.cosway.com.hk/ One FREE trial class with any Cosway purchase receipt over HK$1000 under introducer code : HK370579B 以 HK370579B 作介紹人的 Cosway (網購或門市)購物消費，逾 HK$1000，可免費試上律動班系列一節

LSS Smart Fitness 律動班系列 Wanchai $100/ class ($350 /4-class) $120/ class with WellSpa Treatment Please reconfirm class time by WhatsApp 6523 0389 Vibration x MFR 療癒律動 (Relax, Muscle release & Facial massage) Vibration Fitness (Stretch & Strength) 健體律動 Vibration x BellyFit 美型律動 (Body Shape-up with Bellydance Technique Drills) Vibration x Yoga 律動瑜伽 (Yoga Asana in vibration setting) 45-60 min per session. 每節課約 45-60 min https://eshop.cosway.com.hk/ First time FREE trial with any Cosway purchase receipt under introducer code : HK579632 憑任何以 HK579632 作介紹人的 Cosway (網購或門市)購物收據，可免費試上律動班系列一節

No entry fee, chess players of any ability welcome! Requirements * Purchase food or drink to support the shop. * Treat all patrons and staff with utmost courtesy. * Avoid foul language, we have younger members and don't want to disturb other customers. * Stronger players, please be willing to engage with and help less skilled players. To give yourself a challenge, feel free to play with a time or material disadvantage. * It is normal to change playing partners after a couple of games, don't be afraid to mix it up! * If you want to bring a guest, please send a message to the organizers. * If cancelling, please let us know as soon as you can.

Date: 28-Feb-2026 (Sat) Time: 14:20 - 17:00 \*HKT Coordinator: Calvin Tsang Capacity: 60 Light Refreshments will be available! **Please fill in the form for admission**: [https://forms.gle/Sw8dBj79xNTMG6A8A](https://forms.gle/Sw8dBj79xNTMG6A8A) **Topics:** **Tech Job Market Insight 2026 Q1 (Sinisa Perkovic, Recruitment Market Technologist and Specialist in 8 Figure Recruiter)** * 2026 Tech Job Market Reality Check * 2026 Bonus Expectations for Tech Talent in HK * Inside the Hiring Manager’s Head **Dify 101 Workshop 101 (Li Zheng, 布哥 Dev Rel Manager in Dify）** * Building agentic workflow tutorial **Venue Info:** Ariel Wang Classroom (Room P4701), Yeung Kin Man Academic Building, City University of Hong Kong, Kowloon Tong **Rundown:** * 14:20 - 14:30 Opening Remarks / Upcoming Events * 14:30 - 15:00 Tech Job Market Insight 2026 Q1 (Sinisa Perkovic) * 15:00 - 15:10 Break & Networking * 15:10 - 15:40 Dify 101 Workshop 101 (Li Zheng, 布哥）Session 1 * 15:40 - 15:50 Break * 15:50 - 16:20 Dify 101 Workshop 101 (Li Zheng, 布哥）Session 2 * 16:20 - 16:30 Closing Speaker Info: **Sinisa Perkovic** With over 16 years of experience across Asia in Recruitment, Sales Training, and AI Adoption, Sinisa Perkovic is a Recruitment Market Technologist and Specialist at 8 Figure Recruiter (8FR), based in Hong Kong. Originally from Amsterdam and a recruiter since 2010, Sinisa now leads recruitment and AI projects partnering with TA leaders, Recruitment Agency MDs, and (first-time) Team Leads to make sense of Hong Kong’s fast-evolving recruitment landscape. His training and consulting work focuses on helping Recruiters & TAs overcome structural problems, scale AI adoption, and build resilient, high-performing teams. While at the same time increasing standards across Asia’s recruitment landscape. **Li Zheng 布哥** Former Senior R&D Engineer in the software industry and Senior R&D Engineer in the healthcare industry; Dify Core Contributor; a developer with 10 years of hands-on coding experience. Currently responsible for the evolution and development of the Dify open-source ecosystem. Believes that the world of computing has never been cold and impersonal, firmly believes that open source brings light to software engineering, and is committed to promoting the engineering and real-world adoption of AI agent applications. 曾任軟體產業資深研發工程師，醫療產業資深研發工程師，Dify Core Contributor，10 年代碼手藝人。現在負責 Dify 開源生態演​​進及建置。電腦的世界從來不是冷冰冰的，堅信開源會為軟體工程帶來光，致力於推動 AI Agent 應用工程化落地。 **Audience pre-requisite:** * Recommended having intermediate-level knowledge about Python (1 or more year of experience) **How to join?** * Fill in the form for admission: [https://forms.gle/Sw8dBj79xNTMG6A8A](https://forms.gle/Sw8dBj79xNTMG6A8A) * Click "Attend" in this page

Learn the basic movements and Swings with the Steel mace and combine them to improve youthful attributes like: Full body Strength Rhythm Interconnection of the body in Motion Balance Elasticity Grip strength Class fee 150 Max Atendees 6

**2026 Happy New Year Dance Party** 新年快樂舞會 by LSS Dance Group Mar 1st Sun 3-5pm Kino Theatre, 1/F Eaton Hotel Hong Kong 380 Nathan Road, Jordan, Kowloon 香港逸東酒店 佐敦 * Dance Gala Show * Snack & Drinks * Lucky Draws Ticket : @$220; Performer Ticket : @$300 (including photos & video) Enquiry/ Ticketing: lssdance2012@gmail.com WhatsApp 65230389 Want to perform: https://forms.gle/sq9pAfvD8bzohzmT8

**Google Analytics Alternatives** Is it finally time to make the switch away from Google Analytics? Two-and-a-half years ago Jason Packer asked this question at Columbus Web Analytics Wednesday. Since then: Google’s Universal Analytics has been sunset, we’ve changed our name to Columbus Data & Analytics Wednesday, and Jason has released two editions of his book “Google Analytics Alternatives”. Fresh off the release of the 2nd edition of his book, we thought it was time to re-open this conversation. While people love to complain about it, GA’s market share has remained relatively constant (at least in the United States). Why is that? You won’t find any complaints about GA4 in this talk, but rather an overview of what’s currently available in the market and how to frame your decision-making process. We’ll also be giving out some free copies of Jason’s book! So even if you’ve got a “GA4Lyfe” tattoo (no judgement), there’s free books to go with the free pizza and beer. Thanks to our 2026 sponsors: [Clarivoy](https://www.clarivoy.com), [What Box Consulting Group](https://www.whatboxconsultinggroup.com), [Conductrics](https://www.conductrics.com), and [Piwik PRO](https://piwik.pro) More info at [cbusdaw.com](https://cbusdaw.com)

Window functions have nothing to do with the Windows operating system but provide a “window” to a result set when used in SQL queries. They are powerful, set-based methods to view data in unexpected ways. Window functions provide easy, set-based solutions to solve some common problems: * Using running totals * Performing operations in intervals * Identifying data gaps and islands * Performing aggregates without losing detail Many people are confused by window functions and do not know how to use them properly. This session will explore window functions, how they work, and how to use them. Demonstrations with several examples will solidify how window functions can simplify queries and make them more powerful.

Come out to Improving for our monthly iOS and Mac meetings. This Month's Presentation: Nothing yet. (You should volunteer). What is Cocoaheads (http://cocoaheads.org/)? CocoaHeads is a group devoted to discussion of Apple Computer's Cocoa Framework for programming on MacOS X and iOS (including the iPhone, iPad and Apple Watch). During monthly meetings, members present on their projects and offer tutorials on various programming topics. What is BuckeyeCocoa (http://buckeyecocoa.org/)? BuckeyeCocoa is a group of Objective-C/Swift developers/enthusiasts. We host monthly Cocoaheads and near-weekly NSCoder meetings in Columbus, Ohio. The meetings are free to attend. Presentations! Presenters welcome! We are always in need of people willing to present material. Any Swift and/or Objective-C related topic is welcome. Times can be 5 minutes (i.e. lightning talks) to a maximum of 2 hours. Interested? Contact info is on the BuckeyeCocoa website. To volunteer for a presentation contact us at @BuckeyeCocoa on Twitter. Follow us on Twitter! @BuckeyeCocoa (https://twitter.com/#!/Buckeyecocoa/) For more information: http://buckeyecocoa.org/

**In March we will be making protest signs form carboard, paper, thick markers, and more! All supplies are provided, seats are limited! Come As you are, when you can; hope to see you there!**

We will show a variety of methods for building agents that run in Microsoft Foundry. This covers the different types of agents: Prompt, Multi, and Hosted, as well as the development lifecycle using evals and traces.

**TBA**

Join Sacred Sound Alchemy Columbus for a transformative Sound Bath experience that will take you on a journey of self-discovery and healing. Immerse yourself in the powerful vibrations of various sound instruments like crystal singing bowls and rain drums, carefully orchestrated to balance your chakras and uplift your spirit. The soothing sounds will help you release negative energy, reduce stress, and promote deep relaxation. This event is perfect for those seeking a moment of tranquility and a chance to connect with their inner selves. Whether you are new to sound healing or a seasoned practitioner, you will benefit from the harmonious frequencies that will resonate with your body and soul. Come and allow yourself to be enveloped in a wave of healing energy, leaving you refreshed, rejuvenated, and ready for life's next chapter. Please bring something comfortable to lay on like a yoga mat. Being a pillow for your head or for under your knees and a blanket to cover over yourou. The library can get cold. Bring some water to help flush your body for after the session.