Hey! Ever since I graduated and started working in KL, I always wish to have my own place. But owning a property in the city centre is like next to never or just a dream. ✨✨
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If you are going through the same situation, fret not. I just found an affordable place in the city on top of that its accessible to public transport. It’s none other than Astrum Ampang, a integrated development by Setia Awan Group. 🤩🤩
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Can you imagine owning a urban smart property with a monthly instalment of RM8XX only. Now owning your first property at a young age is no longer a dream. 🤗🤗
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Astrum Ampang is the first SOHO Transit in Malaysia strategically located in the heart of KL City which offers accessibility, convenience, affordability and urban living. 😍😍
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Check out more info and the Top 7 Reasons Why Astrum Ampang is Ideal for Young Adults on my blog (link in the comment box)
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Xavier Mah Consultancy #astrumampang #setiaawan #xmconsultancy #sohotransit #ampang #soho #kl #igmy #kellylifestyle
同時也有186部Youtube影片,追蹤數超過62萬的網紅Coromo Sara. ASMR,也在其Youtube影片中提到,Today's video is an unboxing video for iPad mini 6 and iPad accessories ✨ This video includes tapping, scratching, crinkle sounds, keyboard typing so...
「smart box」的推薦目錄:
- 關於smart box 在 Facebook 的最佳貼文
- 關於smart box 在 DroidSans Facebook 的最佳解答
- 關於smart box 在 Taipei Ethereum Meetup Facebook 的最佳解答
- 關於smart box 在 Coromo Sara. ASMR Youtube 的最佳貼文
- 關於smart box 在 數位時代Official Youtube 的最佳解答
- 關於smart box 在 數位時代Official Youtube 的精選貼文
- 關於smart box 在 小康軒親子網- 《SMART BOX益智遊戲》最完整的介紹來嘍 ... 的評價
smart box 在 DroidSans Facebook 的最佳解答
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smart box 在 Taipei Ethereum Meetup Facebook 的最佳解答
📜 [專欄新文章] Gas Efficient Card Drawing in Solidity
✍️ Ping Chen
📥 歡迎投稿: https://medium.com/taipei-ethereum-meetup #徵技術分享文 #使用心得 #教學文 #medium
Assign random numbers as the index of newly minted NFTs
Scenario
The fun of generative art NFT projects depends on randomness. The industry standard is “blind box”, where both the images’ serial number and the NFTs’ index are predetermined but will be shifted randomly when the selling period ends. (They call it “reveal”) This approach effectively solves the randomness issue. However, it also requires buyers to wait until the campaign terminates. What if buyers want to know the exact card right away? We’ll need a reliable onchain card drawing solution.
The creator of Astrogator🐊 isn’t a fan of blind boxes; instead, it thinks unpacking cards right after purchase is more interesting.
Spec
When initializing this NFT contract, the creator will determine the total supply of it. And there will be an iterable function that is randomly picking a number from the remaining pool. The number must be in range and must not collide with any existing ones.
Our top priority is accessibility/gas efficiency. Given that gas cost on Ethereum is damn high nowadays, we need an elegant algorithm to control gas expanse at an acceptable range.
Achieving robust randomness isn’t the primary goal here. We assume there’s no strong financial incentive to cheat, so the RNG isn’t specified. Implementers can bring their own source of randomness that they think is good enough.
Implementation
Overview
The implementation is pretty short and straightforward. Imagine there’s an array that contains all remaining(unsold) cards. When drawIndex() is called, it generates a (uniform) random seed to draw a card from the array, shortens the array, and returns the selected card.
Algorithm
Drawing X cards from a deck with the same X amount of cards is equal to shuffling the deck and dealing them sequentially. It’s not a surprise that our algorithm is similar to random shuffling, and the only difference is turning that classic algo into an interactive version.
A typical random shuffle looks like this: for an array with N elements, you randomly pick a number i in (0,N), swap array[0] and array[i], then choose another number i in (1,N), swap array[1] and array[i], and so on. Eventually, you’ll get a mathematically random array in O(N) time.
So, the concept of our random card dealing is the same. When a user mints a new card, the smart contract picks a number in the array as NFT index, then grabs a number from the tail to fill the vacancy, in order to keep the array continuous.
Tweak
Furthermore, as long as the space of the NFT index is known, we don’t need to declare/initialize an array(which is super gas-intensive). Instead, assume there’s such an array that the n-th element is n, we don’t actually initialize it (so it is an array only contains “0”) until the rule is broken.
For the convenience of explanation, let’s call that mapping cache. If cache[i] is empty, it should be interpreted as i instead of 0. On the other hand, when a number is chosen and used, we’ll need to fill it up with another unused number. An intuitive method is to pick a number from the end of the array, since the length of the array is going to decrease by 1.
By doing so, the gas cost in the worst-case scenario is bound to be constant.
Performance and limitation
Comparing with the normal ascending index NFT minting, our random NFT implementation requires two extra SSTORE and one extra SLOAD, which cost 12600 ~ 27600 (5000+20000+2600) excess gas per token minted.
Theoretically, any instantly generated onchain random number is vulnerable. We can restrict contract interaction to mitigate risk. The mitigation is far from perfect, but it is the tradeoff that we have to accept.
ping.eth
Gas Efficient Card Drawing in Solidity was originally published in Taipei Ethereum Meetup on Medium, where people are continuing the conversation by highlighting and responding to this story.
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smart box 在 Coromo Sara. ASMR Youtube 的最佳貼文
Today's video is an unboxing video for iPad mini 6 and iPad accessories ✨
This video includes tapping, scratching, crinkle sounds, keyboard typing sounds and more.
・This time it's an unboxing video, so I didn't dare to create a preview.
・This is an ASMR + unboxing video, so it will take a little while to unbox the product.
⭐️Timestamps:
00:00 Greeting
00:42 iPad mini 6 crinkle sound
03:06 Box tapping
05:04 Open the box
05:16 What's in the Box
07:34 iPad mini 6 tapping
09:30 iPad mini 6 turn on
09:40 Protective film crinkle sound
10:15 Case tapping
12:47 What's in the case
14:00 iPad mini 6 Smart Folio box tapping
15:35 Box scratching
16:31 Open the box
16:42 iPad mini 6 Smart Folio tapping
18:00 iPad mini 6 Smart Folio scratching
19:23 Product description
19:44 iPad stand product description
20:30 Mouse product description
20:57 Mouse tapping, click sound
22:58 Typewriter-style keyboard Typing sounds
29:26 Good night🌙
Thank you for watching :)
I hope you have nice dreams🌙
💖🐱Coromo Sara.
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smart box 在 數位時代Official Youtube 的最佳解答
公司簡介
智聯科技專注於人工智慧(AI)在醫療影像的運用以及物聯網(IoT)數據分析。推出的第一項產品——LuluPet AI智慧貓砂盆,其內建AI排泄物影像辨識,可以透過貓糞便影像、重量變化和排泄物行為,蒐集與分析健康數據,提供飼主即時異常警訊並且連結智慧音箱,隨時告訴您貓的最新資訊。
LuluPet focuses on AI in medical imaging and IoT data analytics. The first product - LuluPet AI Smart Cat Litter Box can monitor and analyze the cat’s health data through cat’s stool images, weight change, and excretory behaviors, notifying the owner of any abnormal activities; also LuluPet can be your smart home partner that connects with your smart speaker like Google Home/ Amazon Alexa telling how’s your cat today.
公司網站
https://www.lulupet.com.tw/
smart box 在 數位時代Official Youtube 的精選貼文
公司簡介
歐美國家的物業與居家服務產業需要能管理臨時人員進出,樂邦安控看到現有門禁和房產服務應該做更有效地結合,將門禁管理透過4G/5G連上雲端,提供更完整的權限管理以及連結相關房產服務,以因應日益增多的物業管理及居家服務自動化需求。整體解決方案包含硬體、管理軟體及雲端平台三要件。硬體解決方案為電子化鑰匙盒,其重要的環節是身份驗證,樂邦安控使用的動態二維碼識別已在美國申請專利,透過這樣的驗證方式,不只安全度提升、免除許多物業管理雜務,更有助於串連各項物業管理服務與居家服務,同時達到服務創新的目的。
At Lubn, we are enabling data-driven property management through an integrated hardware & software platform.
Did you know there were 138M properties in the US and near half of them were being managed by realtors or property managers last year? Yes, we want to help Property Manager’s and Realtors become more efficient at managing the properties. We developed an intelligent property management platform by integrating hardware, software and services. The hardware is an LTE connected smart key box with an embedded camera. The device collects the data with its embedded sensors and sends to Lubn Dashboard where we can provide Managers business intelligence. During the pandemic, Lubn enables contactless property management with our wireless technology.
公司網站
https://lubn.com/
smart box 在 小康軒親子網- 《SMART BOX益智遊戲》最完整的介紹來嘍 ... 的推薦與評價
小康軒SMART BOX益智遊戲盒,1書+1玩具開啟孩子更多可能性,孩子比你想像的更聰明。SMART 分別代表了5 個單字:SKILL、MATH、ART、READ、THINK,讓孩子啟發各種能力。專注 ... ... <看更多>