投稿時間:2022-05-30 09:14:33 RSSフィード2022-05-30 09:00 分まとめ(14件)

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IT	ITmedia 総合記事一覧	[ITmedia エンタープライズ] なぜas a serviceへ移行する企業が増えているのか？　ポストコロナのハードウェア戦略	https://www.itmedia.co.jp/enterprise/articles/2205/30/news053.html	asaservice	2022-05-30 08:30:00
IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] ビール「値上げの秋」に　酒類販売回復に逆風懸念	https://www.itmedia.co.jp/business/articles/2205/30/news071.html	気温の上がる夏はビール類の販売が伸びることから、各社は価格改定時期を秋としているが、相次ぐ値上げは新型コロナウイルス禍で落ち込んだ酒類販売の回復に水を差す懸念もある。	2022-05-30 08:24:00
IT	ITmedia 総合記事一覧	[ITmedia News] BroadcomがVMwareを買収した理由　実は双方にメリットあり	https://www.itmedia.co.jp/news/articles/2205/30/news072.html	broadcom	2022-05-30 08:23:00
海外TECH	DEV Community	Demystifying Consensus Mechanisms in Blockchains	https://dev.to/desmondsanctity/demystifying-consensus-mechanisms-in-blockchains-161	Demystifying Consensus Mechanisms in BlockchainsINTRODUCTIONWelcome to another article where we demystify complex blockchain terminologies In this piece we will be explaining what consensus mechanism is what it means for a blockchain network and its effect on the impact of products built on the network Imagine a centralised system where an entity validates the authenticity of data supplied to the system database The entity alone has the sole power to modify accept and reject data according to the set metrics used to measure the data authenticity Now think of a consensus mechanism in a decentralised web as some set of rules or algorithms that entities operate on to authenticate verify and validate block production or transactions in the block itself to avoid fraudulent activities In such a dynamically changing status of the blockchain these publicly shared ledgers need an efficient fair real time functional reliable and secure mechanism to ensure that all the transactions occurring on the network are genuine and all participants agree on a consensus on the status of the ledger This all important task is performed by the consensus mechanism which is a set of rules that decides on the legitimacy of contributions made by the various participants i e nodes or transactors of the blockchain We will be learning the two most used consensus mechanisms in this article Proof of Work Proof of Stake Other consensus mechanisms like Delegated Proof of Work Proof of Authority Proof of Activity Proof of Elapsed Time etc will be discussed in the second part of this article PROOF OF WORK PoW The PoW concept was adapted to securing digital money by Hal Finney in through the idea of reusable proof of work using the SHA hashing algorithm PoW describes a system where a significant and feasible amount of effort is used to deter fraudulent or malicious use of computing power The concept of block productions and block spending is designed to not allow double spending in a block by any of the validators PoW requires nodes on a network to provide evidence that they have expended computational power i e work in order to achieve consensus in a decentralized manner and to prevent bad actors from overtaking the network A pictorial representation of how PoW consensus mechanism worksPROOF OF STAKE PoS In the bid to solve the scalability and environmental sustainability issues that come with PoW consensus mechanism a more better approach to validating and approving blocks of transactions in blockchain was birthed Proof of Stake PoS Proof of Stake is therefore a consensus mechanism or algorithm where validators of blocks no longer need too much computational power through works mining activities to approve or generate blocks but stake a certain amount in the pool to be able to validate transactions Proof of stake changes the way blocks are verified using the machines of coin owners The owners offer their coins as collateral for the chance to validate blocks Coin owners with staked coins become validators Validators are then selected randomly to mine or validate the block This system randomizes who gets to mine rather than using a competition based algorithm like PoW To become a validator a coin owner must stake a specific amount of coins Blocks are validated by more than one validator and when a specific number of the validators verify that the block is accurate it is finalized and closed Security is also more guaranteed in the PoS consensus mechanism as it will take a validator with upto of the staked liquidity to overrun the network But then it is very possible for a single validator to own half of he staked liquidity and have the power to double spend or confirm fraudulent transactions but the PoS algorithm is built in a way that the validator will lose all the staked currency when he sign or approved any illegal block production or transaction thus this creates an incentive for miners to act in good faith for the benefit of the cryptocurrency and the network else the hack will not be profitable A pictorial representation of how PoS consensus mechanism worksProof of Work Vs Proof of Stake PoW and PoS Key DifferencesWorkingThe first pointer for comparing proof of work and proof of stake algorithms would obviously refer to their working PoW involves bundling a group of transactions in a mempool and miners have to verify validity of transactions by solving a cryptographic puzzle As compared to PoW the PoS algorithms do not rely on mathematical puzzles On the contrary the algorithm selects validators randomly according to their stake in the network Proof of Stake algorithm does not involve the creation of any type of coin especially with all coins created from the start SecurityAmong the many factors for deciding the better alternative between PoS and PoW security would obviously take foremost priority In the event of forking in PoW based blockchain systems miners must focus on the actual blockchain or shift to the new blockchain fork Constant forking can present a formidable economic disadvantage and could help hackers gain control over of computation power for carrying out malicious attacks On the other hand PoS consensus does not impose restrictions on forking No financial incentive for validating multiple transaction copies on a blockchain It is difficult for hackers to own of stake in a blockchain network and if they do they will lose their staking power and staked currencies making it unprofitable EnergyThe next critical factor for differentiating between PoW and PoS consensus algorithms refers to energy efficiency PoW consensus algorithm focuses on identifying the user who could modify the ledger by leveraging a competitive race Participants in the race or miners have to use computational energy for proposing valid blocks that follow the network rules On the other hand PoS presents better scope for energy efficiency However PoW miners have the flexibility for using any type of energy sources such as wind hydropower and other sustainable energy sources PoS consensus is highly energy efficient although at higher costs of resources RewardsThe comparison of proof of stake vs proof of work would also focus on the factor of reward distribution Which consensus mechanism serves a better fit for miners In the case of PoW consensus Rewards are given to the first miner successful in solving the cryptographic puzzle for every block However validators do not receive any block reward rather they settle for network fees as their reward CONCLUSIONWhether a network is using PoW or PoS consensus mechanism to validate their blocks produce blocks etc we have learnt a great deal of how these work under the hood and the economical environmental and financial implications of using any of the consensus algorithms We will conclude the discussion about the other existing consensus mechanisms in the final part of this article on “Demystifying Consensus Mechanism in Blockchains Do well to share your thoughts share with others and suggest what you want us to break down in our next piece	2022-05-29 23:43:42
海外TECH	DEV Community	Elixir, Kubernetes, and minikube	https://dev.to/miguelcoba/elixir-kubernetes-and-minikube-4fb9	Elixir Kubernetes and minikubeA couple of weeks ago I presented my talk Elixir Kubernetes and minikubein the Elixir Meetup organized by the fine people on curiosum com This talk is based on chapter of my book Deploying Elixir Advanced Topics If you haven t gotten the book this is an excellent way to see what the book is about Watch the recorded talk here Elixir Kubernetes and minikube AboutI m Miguel Cobá I write about Elixir Elm Software Development and eBook writing Follow me on TwitterSubscribe to my newsletterRead all my articles on my blogGet my books Elixir Tips FREE Deploying Elixir FREE Deploying Elixir Advanced TopicseBook Writing Workflow for Developers	2022-05-29 23:03:41
海外科学	BBC News - Science & Environment	Peat soil fires: Campaigners say England's 'rainforests' illegally burned	https://www.bbc.co.uk/news/science-environment-61607510?at_medium=RSS&at_campaign=KARANGA	amounts	2022-05-29 23:50:21
ニュース	BBC News - Home	Crime victims see delays rise and charges fall - BBC research	https://www.bbc.co.uk/news/uk-61592910?at_medium=RSS&at_campaign=KARANGA	officers	2022-05-29 23:03:33
ニュース	BBC News - Home	Partygate: How much political danger is Boris Johnson in?	https://www.bbc.co.uk/news/uk-politics-61627796?at_medium=RSS&at_campaign=KARANGA	future	2022-05-29 23:03:06
ニュース	BBC News - Home	Peat soil fires: Campaigners say England's 'rainforests' illegally burned	https://www.bbc.co.uk/news/science-environment-61607510?at_medium=RSS&at_campaign=KARANGA	amounts	2022-05-29 23:50:21
北海道	北海道新聞	エルサレムで右派が国旗掲げ行進　「アラブ人に死を」叫ぶ	https://www.hokkaido-np.co.jp/article/687081/	行進	2022-05-30 08:10:00
北海道	北海道新聞	コロナ感染者名、誤って掲載　函館市　ＨＰに８１人分３０分間	https://www.hokkaido-np.co.jp/article/687043/	管理	2022-05-30 08:08:03
マーケティング	MarkeZine	最近のヒット商材に見る商品開発のヒント	http://markezine.jp/article/detail/39050	商品開発	2022-05-30 08:30:00
マーケティング	AdverTimes	東京地下鉄、取締役の昇任（22年6月29日付）	https://www.advertimes.com/20220530/article385324/	専務取締役	2022-05-29 23:52:49
マーケティング	AdverTimes	J.フロントリテイリング、コーポレートガバナンス推進室（22年6月1日付）	https://www.advertimes.com/20220530/article385321/	取締役会	2022-05-29 23:38:52