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反送中答問集
前言:二零一四年九月二十八日,我在淚水中寫了〈香港怎麼了:佔中十七問〉,協助中國大陸和台灣讀者理解佔領運動。今天,香港人再次走上街頭,受到警察的無情鎮壓。我在此再次強忍眼淚,嘗試把事情的始末說清楚,讓香港以外的朋友知道真相。1. 香港又怎麼了?
explained  hongkong  2019 
4 days ago by aries1988
Atrocities. Norms. Bicycles. See Where We’re Going With This?
But he didn’t do it alone. An entire team culture enabled Mr. Armstrong and his fellow riders to dope themselves to peak performance. The team’s doctor, its support workers, even riders’ wives were all enlisted to support and cover up the drug regimen. Team members from that time describe doping as a joint effort, something everyone approached with the same dedication and care that they applied to the rest of their training.

The pervasive doping, on that team and others, endangered riders’ health. It ruined lives. But if you read accounts by people who were involved, the most striking thing is that doping didn’t feel bad to them at the time. It felt more like a responsibility; one more thing that the team was doing to reach their ultimate goal of victory — and that everyone needed to help with.

Everyone on Lance Armstrong’s team knew that performance-enhancing drugs were banned in cycling. But those weren’t the rules that mattered. The internal rules, the norms for how people should behave to be a good member of the team, were the ones that held sway. And those norms said: Good members of this team do whatever it takes to win, so take the drugs.

In fact, even if you do know that your group is wrong, independence is still painful. In a 2005 study, fMRI scans of people contradicting their group’s statements showed increased activity in the part of the brain that processes emotional distress and fear, even when the subjects knew they were giving the correct answer to an easy question.

Those incentives, left unchecked, will shape group norms; those norms, in turn, will demand conformity. Participation in horrifying acts can become a condition of membership in good standing.
social  norm  concept  morality  population  example  explained 
9 days ago by aries1988
This Is How I Thread (Parallelism & Pointwise) | Another Fine Mesh
If parallelism is a tool, then that implies it is used to build something. What is that something? Put simply, optimized software. More specifically, parallelism is used to help computers solve bigger problems in less time. However, parallelism is not the only technique used to optimize code.

In the computing world, one name we give our workers is threads (short for threads of execution). When multiple threads are used in conjunction to solve a problem, this is called multithreading. If a problem can be subdivided so that multiple threads may execute concurrently to accomplish the same goal, then less time will be required to finish. However, subdividing problems is not always straightforward.

Fortunately, the algorithms used for many of the examine metrics in Pointwise fall into the “embarrassingly parallel” category.
So, what does it mean for an algorithm to be “embarrassingly parallel”? Simply put, it means that very little effort is required to divvy up a problem into parallel tasks. On top of this, little or no communication or synchronization among threads is required. Raw information is provided to each thread and each thread processes that data independently.
Unfortunately, cases like this are the exception. Data is rarely in such an amenable format, and threads often need to be highly interdependent to arrive at a solution.

However, closer inspection reveals that simply dividing the point data between threads for multithreaded execution will not provide sufficient isolation. This is because the algorithm requires that incident element data remain constant while a point is being positioned. If one thread modifies any point on a hull that another thread is manipulating, then results become inconsistent at best and corrupt at worst. The likelihood of such a scenario occurring increases dramatically as the number of threads increases.

Such organization can be achieved through the use of mesh partitioning. If the input mesh may be reliably and consistently partitioned into contiguous chunks, then each thread would be free to operate on its own chunk without fear of interfering with a concurrent thread.
The solution we adopted for this problem is to create a new, non-contiguous partition that only includes boundary points. This partition is then processed serially after multithreaded execution.

Of course, mesh partitioning presents overhead that a serial implementation
explained  parallelism  example  mesh  tool 
10 days ago by aries1988
What y+ should I run? Part 1 – The underlying physics
I would also like to make a note that its recommended to either resolve the viscous sublayer at y+1 or the log region at y+>30 and not to place the first cell in-between them. The model has been calibrated either case and CFD software deals with transition between the layers differently.
cfd  explained 
10 days ago by aries1988
小区为什么走向衰败?-虎嗅网
说到这里,既然庞大的封闭式小区,对小区治理这么不友好,为什么这么多年仍然没有什么该管呢?

其实,在2016年,因为拆掉封闭小区围墙而引发的那波讨论中,对封闭小区和开放小区做利弊分析时,已经有过答案:

大体量的封闭小区可以减少城市公共服务投入成本,小区内的硬件环境、绿化环境以及安全问题,由业主以物业费的形式承担,而国外的非封闭小区的公共服务,则由政府通过税收的方式来承担。
explained  housing  appartement  chinese 
14 days ago by aries1988
Want a New Emoji? Good Luck. - by Andy Warner
How a nearly invisible cabal of tech industry leaders controls what you can and can’t type 🤔
emoji  unicode  language  journalism  cabals  cartoon  webcomic  explained 
15 days ago by kme
GitHub - alex/what-happens-when: An attempt to answer the age old interview question "What happens when you type google.com into your browser and press enter?"
An attempt to answer the age old interview question "What happens when you type google.com into your browser and press enter?" - alex/what-happens-when
interviewquestions  tech  explained 
15 days ago by kme
中国人为什么爱吃猪肉
中国是世界第一的猪肉消费大国,尽管近些年随着生活富裕、口味多元,全国猪肉消费总量已从2014年最高峰时的5719万吨下降到去年的5489万吨,但仍然 稳占全球一半份额 [1] ――也就是说, 中国人口虽然只是世界五分之一,但每两斤猪肉里就有一斤是被中国人吃掉的。…
numbers  chinese  porc  explained  food  taboo  environment  china  region  population  from instapaper
17 days ago by aries1988
诸神的黄昏
《春之祭》从文化史的角度给出了一个不同的解释:那场战争本质上是一场对旧秩序的宏大反叛,而这种普遍的内在冲动早已在人们的意识深处燃起。

这是一部德国视角的文化史,不说别的,单是这种从文化角度来看待战争冲突的想法就非常德国。可以说,一战本身就是一场“文化”对“文明”的战争:保守倾向的英法所讲究的是从市民社会发展而来的“文明”(civilization),但在反叛者看来,在戴着谦恭有礼和尊重国际法的虚伪面具下,仍是弱肉强食的丛林规则;而德国所推崇的“文化”(Kultur)则更偏向精神、道德与意志,按斯宾格勒的观点,那是生命进程或历史的基本现象,所有历史的文化象征都暗示着生命的形而上奥秘——这种带有神秘倾向的内在冲动,在英国的“文明人”看来则是非理性的、不守文明规范的。

在很大程度上,它也深受德国历史哲学的影响,带有浓厚的德国文化气息,那种从绘画、舞蹈等艺术类型切入来洞察时代精神变迁的手法,与斯宾格勒《西方的没落》如出一辙,也势必像前者一样饱受争议。不过显然,作者对“德国文化”也有其相对狭隘的界定——例如马克思主义这个同样主张斗争与解放的德国思潮,就并未包括在他的分析之中。对于政治人物那种诸如“维护德国人的感情”、“出于责任和荣誉”之类的说辞,他似乎也并未加以怀疑。从某种程度上说,这本《春之祭》本身的书写就像是沉醉在对复原那段历史的审美体验之中,那与其说是一段历史,不如说是一部歌剧。
ww1  deutsch  zeitgeist  art  book  war  uk  explained  civ  culture  from instapaper
17 days ago by aries1988
شرح هجمات حجب الخدمة – DDOS Attacks Explained
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<p>شرح هجمات حجب الخدمة – DDOS Attacks Explained اكبر DDOS Attack في التاريخ : https://www.theguardian.com/technology/2016/oct/26/ddos-attack-dyn-mirai-botnet معلومات عن انواع الهجمات … شرح,هجمات,شرح هجمات,هجمات حجب الخدمة,حجب الخدمة,DDOS Attacks,DDOS,Attacks,DDOS Attacks Explained,botnets,servers,servers stops,how servers stops,reasons of servers stops,اسباب توقف السيرفرات,توقف السيرفرات,انواع الهجمات,اكبر هجوم علي المواقع في التاريخ,اكبر هجوم DDOS في التاريخ,انواع الهجمات الاليكترونية,types of electronics attacks,electronics attacks,هجمات الكترونية     […]</p>
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فيديو  Attacks  botnets  DDOS  DDOS  Attacks  DDOS  Attacks  Explained  electronics  how  servers  stops  reasons  of  servers  stops  servers  servers  stops  types  of  electronics  اسباب  توقف  السيرفرات  اكبر  هجوم  DDOS  في  التاريخ  اكبر  هجوم  علي  المواقع  في  التاريخ  الخدمة  انواع  الهجمات  انواع  الهجمات  الاليكترونية  توقف  السيرفرات  حجب  حجب  الخدمة  شرح  شرح  هجمات  هجمات  هجمات  الكترونية  هجمات  حجب  الخدمة  from instapaper
22 days ago by snapeplus

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