dnqthao

related https://en.wikipedia.org/wiki/Mongol_invasions_of_Vietnam

How is this technology compared to Samsung's 14nm technology?

It is a very simple reason. They don't want to support multiple devices login as the same time to the same account. The reason for this I think it is because of their architecture constraints: - Currently, they are storing all the messages on the phone. So once the message is received by the phone, it will be removed from Whatsapp server. This can save the storage and processing cost on the server. If you want to support multiple clients, you need to save those messages on the server for a period of time (e.g. a few weeks).

- If you allow two clients online at the same time, you need to support "carbon copy" meaning you need to send the messages to all the clients and keep the status of the messages in sync. This will take a lot of processing on the server side.

- When a client offline for a long time goes online, you also need to sync from the server all the messages that were sent during the client is offline.

So their architecture was built in such a way that the processing power on the server side is limited to the minimum. I believe that they may change its strategy in the future. However, it will take time.

My first read of the title is "Make Great Firewall Feel Small".

I have no comments about the demo in the video. However, from what I understand about GR, the important concept is that mass bends space-time (3D space and 1D time). Time and space in GR is inseparable. This is an important concept.

So the next question is why in GR, the two mass objects gravitated each other. It is because in GR, object follows the geodesics (i.e. straight line, shortest path) in space-time. So imagine, if there is only 1 object, it will follow the geodesics of spacetime with space coordinates being constant and time coordinate is changing with a constant rate.

However, if another object is placed near it, it will bend the space time surrounding it. So now, the geodesic is not "straight" anymore. The new geodesic will include changes in the space coordinates ( object moving nearer to each other).

So there is actually no pull force of gravity, it justs that the spacetime is curved thus the "straight line" now appears "curved" in our perspective.

Nice, we look forward in the future for Chu Nom scripts.

i would like to know how NASA received the data from the Space Shuttle Columbia in 2003. Can we use the same technology for commercial aircraft ?

that's exactly what was my thinking also.

group chat

here in vietnam, we have like 7million users

Windows Phone in Vietnam are more of a cheaper phone (comparable to Android devices) rather than compete directly with the expensive iPhones. For those customers who can afford the iPhone, they will buy the iPhone instead of a high end Nokia Windows Phone.

and 19/1/2014 is the 40th year anniversary of the Battle Of Paracel Islands between China and the then Republic of Vietnam (South Vietnam).

http://en.wikipedia.org/wiki/Battle_of_the_Paracel_Islands

It seems that the AK-47 invention is very similar to our open source software: open design (a lot of copy cat and improvement), no royalty pay, work everywhere , etc...

it reminds me of the Narrator in Fight Club, after he got bruised eyes, nobody cared to ask him about that.

The encryption use is PKCS #5 (5.3 PBE with MD5 and DES). The algorithms are outdated but in the subsequent release we can update it to SHA-2 and AES-256.

We cannot do PFS because we have the feature that a person can login to different devices and can still see the same messages and continue the chat ( given that he knows the chat password)

Not sure why i cannot reply to the comment below, so i reply it here. The encryption use is PKCS #5 (5.3 PBE with MD5 and DES). The algorithms are outdated but in the subsequent release we can update it to SHA-2 and AES-256.

An example: https://www.facebook.com/photo.php?fbid=263620283790579&set=...

We are using PBE for the messages in the secure chat ( you can choose whether to start a normal chat or a secure one ).

The encryption is done on the client side, so the message going through the network ,storing on the server are all encrypted. Only when you type the correct password then you can decrypt the message.

Maybe you can elaborate more on this.

The message will be encrypted on the client side (iphone , android or PC ) , so the message sent over the network are already encrypted using the password provided by the user. So only when the user type in the correct password then he can decrypted it. If he forgot the password , so sad, the message cannot be read anymore.

This one is so real!

Q: “How much does an app cost?” A: “About as much as I make?

Too scared to write a simple operating system

Cook something or get out of bed for less than $10,000 per day.”

In Math You Have to Find Them

Fastest-growing YC S11 startup looking for hackers. Join us in our quest to kick healthcare's ass.

Marx predicted it long time ago.

"According to Marxist analysis, class conflict within capitalism arises due to intensifying contradictions between highly-productive mechanized and socialized production performed by the proletariat, and private ownership and private appropriation of the surplus product in the form of surplus value (profit) by a small minority of private owners called the bourgeoisie."

http://en.wikipedia.org/wiki/Marxism

Yes, you are right, nowadays Vietnamese did not use Chu Nom anymore. I think the main reason is because of its complexity.

The simplicity of Hangul is partly because of the simplicity in the Korean syllables. It will be much harder to derive a simple writing system for a complex-sounding language like Vietnamese or English.

Btw, for the 3 countries, Vietnam, Korea, Japan, that were influenced by Chinese writing deeply, each of them has a different approach.

Korean came out with its Hangul writing system. Japanese came out with hiragana and katakana (together with Kanji). Vietnamese came out with Chu Nom ( http://en.wikipedia.org/wiki/Chu_nom) , a logographic script that is even more complex than Chinese characters.