HNHacker News
TopNewBestAskShowJobs

mdani

386 karma · joined November 11, 2014

submissionscomments
mdani··on Stanford researchers confirm N95 masks can be sterilized in oven
Wondering if direct sunlight would be as effective as UV light?
mdani··on Anatomy of a Rental Phishing Scam
In the reply, I'd probably include 1x1 pixel hidden tracker image or maybe a legit looking logo below signature and get the client ip of the scammer's computer when it does http GET on it. The ip can tell more about where they're located.
mdani··on Evaluation of CPU profiling tools: gperftools, Valgrind and gprof (2015)
It was great on physical hosts but could not get it working in EC2 VMs
mdani··on Telomere shortening rate predicts species life span
For humans, about 15 kbp telomere can be reduced to 50% in about 107 years at the rate of about 70 bp per year. That number goes well with the max life spans we observe in humans.
mdani··on Betrayed by an app she had never heard of
Use Twilio Proxy https://www.twilio.com/proxy
mdani··on Rare Persian manuscripts dating back to 13th century now online
wow, this is amazing. Reading Qazwini's Padshahnama.

Even though I am a full time engineer like most others here, I had an interest in history so I learned to read Nastaliq hand written script and basics of Persian grammar online (had no knowledge of Farsi when I started). A lot of collections are now online so the first-hand sources are much more accessible now.

I still have issues deciphering the full meaning or reading an old hand which is beyond my basic skills. Anyone willing to help or know a good book/site that will help me in deciphering these old manuscripts (Persian or Arabic)?

mdani··on Twilight of the Taj Mahal
The need to maintain Taj is not new, in fact just a couple of decades after its construction in 17th century, the dome leaked and it had to be repaired. As Mughal reign fell into decline, the plunder began and the British were not left behind. The precious stones were removed from inlays, furniture was plundered and even plans were made to dismantle and auction the marble.

One must evaluate the decline of Taj in this broader context. It is currently maintained by ASI and they have replaced many precious stones abd repaired the Taj as much as they can. Unfortunately they do not always follow the same medival construction methods and do not have adequate funds, so repairs do fail.

Polloution is terrible in Delhi- Agra corridor but one must balance the needs of the poor to earn a living vs. the needs of the tourists to see the Taj in pristine condition. For this reason a blanket ban will not work in practice.

I think the BBC article is one sided, and the complexity of the situation needs to be taken into account before painting a pessimistic picture.

Aga Khan trust has done excellent work in Humayun's tomb and I think it is a better model for moving forward.

https://youtu.be/eCLEFJU1p5A

mdani··on Amazon DynamoDB Transactions
Aurora did not work well for us (it was using local ephemeral disk to do sorts so our query results were truncated / limited to largest local storage) so the best option for us was to run MySQL or PostGres on a i3 instance with local SSDs.
mdani··on Ask HN: YouTube down?
Google search very slow / down for me. Anyone seeing the same?
mdani··on YouTube down worldwide
I was blaming it on Comcast - couldn't believe its youtube. I can search videos fine, so looks like a problem with media side.
mdani··on Ericsson and T-Mobile ink $3.5B deal for 5G
Yes, there is a set of 3GPP specs that define 5G standard. Slicing of the network to provide low latency is one of the highlights. There are open source implementations such as openCORD that target the same goals.
mdani··on Indian warrior king's rocket cache found in abandoned well
Tipu made the first indigenous rocket is a myth. There is ample evidence that the indigenous rockets were in use in Deccan at least 100 years before Tipu’s time. History of Aurangzeb’s reign, the Farsi manuscript of Mathir-i Alamgiri and the official records of the reign called Akhbarat-i Darbar-i Mualla mention Aurangzeb examining an indigenously made rocket at the siege of Satara diring his wars in Deccan in 1700 AD. So its sad to see the myth alive and being reported by British press.
mdani··on Unilever threatens to pull its ads from Facebook and Google over 'toxic content'
Its not what you want to see or buy - they’ll push the ad from a provider who’s bidding highest and providing them most revenue.
mdani··on India’s IT industry laid off more than 56k employees this year
Here school means elementary, middle school,high school etc. where they teach MS Word etc. In India, CS departments are in “colleges” also called “schools” in US so this may not be bullshit for the reason you stated.
mdani··on OCR and Medieval Manuscripts: Establishing a Baseline (2015)
In my experience, tesserect 4 with LSTM is far more accurate in recognizing characters. It was not there in 2015, so the post would probably need an update or a follow up.

https://github.com/tesseract-ocr/tesseract/wiki/4.0-with-LST...

mdani··on MySQL utf8 vs. utf8mb4 – What's the difference?
utf8 to utf8mb4 also breaks replication so be extra careful if you have slaves replicating. You'd need to switch off row or mixed replication and switch to statement based till changes are done on all nodes.
mdani··on Show HN: Copyfish – Extract text from images, videos or PDF
No need to use third-party extensions if you have a Google cloud account. You can download https://github.com/kaneshin/pigeon and just run it from command line - protects privacy and more secure compared to relying on third-parties.
mdani··on Dumping Yahoo authentication secrets with an out-of-bounds read
What is pointer visualization?
mdani··on CPU Utilization is Wrong
Second that. It is amazing for C and C++ code - but does not work well on VMs such as AWS or with Java code.
mdani··on Shape Catcher: Find Unicode characters by drawing them
I am learning to read a new language- urdu. My goal is to read some old hand-written documents so I can't copy-paste the characters. But I can easily draw them and confirm my reading. This is perfect for this purpose.
mdani··on Big Tech Company Salaries Are Hurting Startups
The article assumes that most of the engineers at that experience level are hired by Gooogle/Facebook etc, but it is simply not the case. The acceptance rates are quite low and there are plenty of 5-10 year experienced engineers who would be willing to work for startups at $130k.
mdani··on Anger as US internet privacy law scrapped
My ISP Comcast has the following in its privacy policy. I hope this clause stays the same - then you can opt out :)

--- The Cable Act authorizes Comcast as a cable operator to disclose limited personally identifiable information to others, such as charities, marketing organizations, or other businesses, for cable or non-cable “mailing list” or other purposes. From time to time we may disclose your name and address for these purposes. However, you have the right to prohibit or limit this kind of disclosure by contacting us by telephone at 1-800-XFINITY or by sending us a written request as described below under “How do I contact Comcast?” Any “mailing list” and related disclosures that we may make are limited by the Cable Act to disclosures of subscriber names and addresses where the disclosures do not reveal, directly or indirectly, (i) the extent of any viewing or other use by the subscriber of a cable service or other service provided by us; or (ii) the nature of any transaction made by the subscriber over our cable system.

mdani··on Anger as US internet privacy law scrapped
Is there a way to opt out explicitly by requesting the ISP not to share your data?
mdani··on Triple Flaw in Nest's Dropcam
I have a Nest camera. You're right, being in same VLAN does not give you access to video feed (at least via http). You need to view it online from their cloud.
mdani··on Skype: Problems with sending messages and sign-in
It looks like the Microsoft Live sign-in is affected, hence Skype, OneDrive and Outlook - all of them are affected.
mdani··on In Its Third Month, India’s Cash Shortage Begins to Bite
About 75,000 CR (roughly $10 billion) did not come back in circulation. I don't think this is a small amount (more so by Indian standards) so while the estimates for #1 were way off, there was something uncovered. Nobody knew in advance how much black money existed so it was a wild guess before this exercise anyway. So I don't think your #1 criticism is valid.

Source: http://indianexpress.com/article/business/economy/demonetisa...

mdani··on RethinkDB Postmortem
The database will never sell itself. You need use cases - even Oracle sells sofware solutions for ERP, CRM and SCM which come bundled with a Oracle database. Microsoft SQL server is another example of bundling. So use cases come first before correctness, consistency or excellent SQL.
mdani··on Apple to slice iPhone production 10% due to sluggish sales
You're absolutely correct - these things can all be fixed. I think the main point is that it kills the excitement of getting a new expensive device. It just becomes more and more work to regain the control back.
mdani··on Cassandra is not row level consistent
Right. Cassandra crawled at 20 TPS when we sent IF cql statements. One thing to note is that Cassandra txns can never be rolled back - they can only be committed/ retrried and so on.
mdani··on How Google Is Challenging AWS
This is changing - I got a call from Google Cloud sales/support today. I am just using the GCP for prototyping so I have spent maybe $50 on it so far. Looks like they're stepping up their gane and really trying to be helpful and willing to listen to customers.
← PreviousPage 2 of 3Next →