• Tech Insights: Are LED filament-lamps so good?

    • Translation
    Saluting my LED lamp fans!

    Today we will talk about the palpitating and extremely popular subject in recent years — filament LED (Light-Emitted Diode) lamps. Numerous articles have been published here on Habr (1, 2, 3) and on the web, but none of them tells us a word about in-depth analysis of the lamps (what is actually inside) and comparison of their temperature characteristics. Therefore, especially for you — my dear LED-lovers — I conducted a detailed analysis of such lamps from different manufacturers, including temperature measurement of LEDs themselves.

    Afterwards we will try to answer the question: are filament lamps as good as marketers present them to us?

    Disclaimer: this is my very first attempt to translate and adopt an article from Habr into English, so I will ask you to give a fruitful feedback and correct some mistake if any present.
    Shock, thrill and scandals!
  • Dog Breed Identifier: Full Cycle Development from Keras Program to Android App. on Play Market

      With the recent progress in Neural Networks in general and image Recognition particularly, it might seem that creating an NN-based application for image recognition is a simple routine operation. Well, to some extent it is true: if you can imagine an application of image recognition, then most likely someone have already did something similar. All you need to do is to Google it up and to repeat.

      However, there are still countless little details that… they are not insolvable, no. They simply take too much of your time, especially if you are a beginner. What would be of help is a step-by-step project, done right in front of you, start to end. A project that does not contain «this part is obvious so let's skip it» statements. Well, almost :)

      In this tutorial we are going to walk through a Dog Breed Identifier: we will create and teach a Neural Network, then we will port it to Java for Android and publish on Google Play.

      For those of you who want to see a end result, here is the link to NeuroDog App on Google Play.

      Web site with my robotics: robotics.snowcron.com.
      Web site with: NeuroDog User Guide.

      Here is a screenshot of the program:

      image

      Read more →
      • +11
      • 10.6k
      • 6
    • Cosmonaut Aleksandr Laveykin about the best space movie, G-force of 20g, and soft landing

        Three years ago, ASCON, the parent company of C3D Labs, invited cosmonaut and Hero of the Soviet Union Aleksandr Laveykin to its Partnership Conference. As a guest speaker, he told the audience of Russian IT companies about his 174-day spaceflight and answered questions posed by conference attendees.

        Up to now, the Q&A had not been translated into English. We post them for upcoming International Day of Human Space Flight (or Cosmonautics Day in Russia).

        Aleksandr Laveykin flew to space in 1987 and worked as a flight engineer on board the Mir Space Station, orbiting the Earth for six months. He completed three spacewalks lasting a total of eight hours and 48 minutes.

        image
        Image: TASS

        Read more →
      • Estimation of VaR and ConVaR for the stock price of the Kazakhstani company

          The last decades the world economy regularly falls into this vortex of financial crises that have affected each country. It almost led to the collapse of the existing financial system, due to this fact, experts in mathematical and economic modelling have become to use methods for controlling the losses of the asset and portfolio in the financial world (Lechner, L. A., and Ovaert, T. C. (2010). There is an increasing trend towards mathematical modelling of an economic process to predict the market behaviour and an assessment of its sustainability (ibid). Having without necessary attention to control and assess properly threats, everybody understands that it is able to trigger tremendous cost in the development of the organisation or even go bankrupt.


          Value at Risk (VaR) has eventually been a regular approach to catch the risk among institutions in the finance sector and its regulator (Engle, R., and Manganelli S., 2004). The model is originally applied to estimate the loss value in the investment portfolio within a given period of time as well as at a given probability of occurrence. Besides the fact of using VaR in the financial sector, there are a lot of examples of estimation of value at risk in different area such as anticipating the medical staff to develop the healthcare resource management Zinouri, N. (2016). Despite its applied primitiveness in a real experiment, the model consists of drawbacks in evaluation, (ibid).


          The goal of the report is a description of the existing VaR model including one of its upgrade versions, namely, Conditional Value at Risk (CVaR). In the next section and section 3, the evaluation algorithm and testing of the model are explained. For a vivid illustration, the expected loss is estimated on the asset of one of the Kazakhstani company trading in the financial stock exchange market in a long time period. The final sections 4 and 5 discuss and demonstrate the findings of the research work.

          Read more →
        • 7 Interesting startups in IoT

            The “winner takes all” principle seems to be less relevant to a startup business model than to a corporate business. Why so? The thing is that a cumulative advantage inherent in a contemporary globalized economy when the bigger you are the more chances you have for a further growth works beyond poorly regulated environments to which startups belong. The startup phenomenon in general and the IoT startups in particular are too immature in terms of a business-model history. In contrast to corporations, startups feel good in a Black-Swan-friendly uncertainty of emerging innovations. They operate in risky fields, they gamble oftentimes. But an immense focus on their own topics is what helps them survive. Indeed, dedication is an antidote to risks.

            Originally article was posted here — 5 IoT startups in Logistic
            Read more →
          • Hack Your XiaoMi Vacuum Cleaner

            image

            Laziness moves the world. And today we have more and more robotic vacuum cleaners that are saving our time for something more pleasant than just vacuuming.

            The robots were marketed as internet/Bluetooth/smartphone connected devices with a speaker and camera to report and explore the environment. They also have different sensors to dodge barriers and such. But that’s only some ordinary stuff everyone knows about the robotic vacuum cleaners.
            But the most interesting thing about them is their software. The owners can reprogram these devices and implement different settings as well as voice acting that has a huge number of options, including funny ones. And all you need to “upgrade” your vacuum cleaner is a PC, an internet connection, and a smartphone:
            Read more →
          • Flightradar24 — how does it work? Part 2, ADS-B protocol

              I’m going to have a guess and say that everyone whose friends or family have ever flown on a plane, have used Flightradar24 — a free and convenient service for tracking flights in real time.

              image

              In the first part the basic ideas of operation were described. Now let's go further and figure out, what data is exactly transmitting and receiving between the aircraft and a ground station. We'll also decode this data using Python.
              Read more →
            • Liza Alert: volunteers, who save lives



                Liza Alert search-and-rescue team has existed for eight years. It’s a volunteer organization, the fellowship of the ones who care, that searches for missing people effectively collaborating with the Ministry of Emergency Situations and the Ministry of Internal Affairs. Liza Alert collects the entries on missing people; they conduct various educational events, search management and search operations themselves. The team isn’t involved in any business activities, doesn’t have a checking account and doesn’t accept monetary donations.

                Mail.Ru has recently provided Liza Alert with a free platform for services, extensively used for search-and-rescue operations. We decided to talk to Sergey Chumak — the head of Liza Alert IT branch — about the work of the volunteer emergency response group and how high-tech solutions aid them.
                Read more →
              • How I discovered an easter egg in Android's security and didn't land a job at Google

                • Translation
                Google loves easter eggs. It loves them so much, in fact, that you could find them in virtually every product of theirs. The tradition of Android easter eggs began in the very earliest versions of the OS (I think everyone there knows what happens when you go into the general settings and tap the version number a few times).

                But sometimes you can find an easter egg in the most unlikely of places. There’s even an urban legend that one day, a programmer Googled “mutex lock”, but instead of search results landed on foo.bar, solved all tasks and landed a job at Google.

                Reconstruction
                image

                The same thing (except without the happy ending) happened to me. Hidden messages where there definitely couldn’t be any, reversing Java code and its native libraries, a secret VM, a Google interview — all of that is below.
                Read more →
              • Microsoft expands Azure IP Advantage Program with new IP benefits for Azure IoT innovators and startups

                  Drawing of lightbulb in protected circle


                  At Microsoft, we’re investing in helping our customers as they move to the cloud. We see an opportunity to help support companies in this changing environment by bringing our security, privacy, compliance and intellectual property assets and expertise to bear in order to help them be more successful. We’re excited to now take an additional step that expands innovation protections.

                  Today, we are pleased to announce the expansion of the Microsoft Azure IP Advantage program to include new benefits for Azure IoT innovators and startups. We first announced Azure IP Advantage in February 2017, to provide comprehensive protection against intellectual property (IP) risks for our cloud customers. A trend we saw at the time – and one that continues today – is a growing risk to cloud innovation from patent lawsuits. Last year, we joined the Open Invention Network (OIN) and the License on Transfer (LOT) Network to help address patent assertion risk for our customers and partners.


                  This article in our blog.
                  Read more →
                • Web application firewalls

                  Web application firewall


                  Web application firewalls (WAFs) are a type of intrusion detection and prevention system and might be either a hardware or software solution. It is specifically designed to inspect HTTP(s) and analyse the GET and POST requests using the appalling detection logic explained below. Web application firewall software is generally available as a web server plugin.

                  WAF has become extremely popular and various companies offer a variety of solutions in different price categories, from small businesses to large corporations. Modern WAF is popular because it has a wide range of covered tasks, so web application developers can rely on it for various security issues, but with the assumption that this solution cannot guarantee absolute protection. A basic WAF workflow is shown below.



                  Its main function is the detection and blocking of queries in which, according to WAF analysis, there are some anomalies, or an attacking vector is traced. Such an analysis should not make it difficult for legitimate users to interact with a web application, but, at the same time, it must accurately and timely detect any attempted attack. In order to implement this functionality, WAF developers usually use regular expressions, tokens, behavioural analysis, reputation analysis and machine learning, and, often, all these technologies are used together.



                  In addition, WAF can also provide other functionality: protection from DDoS, blocking of IP-addresses of attackers, tracking of suspicious IP-addresses, adding an HTTP-only flag to the cookie, or adding the functionality of CSRF-tokens. Each WAF is individual and has a unique internal arrangement, but there are some typical methods used for analysis.
                  Read more →
                • Bitcoin (BTC)’s Low Volatility Will Lead to the Next Crypto Bull Run

                  Curiosity has taken over the crypto space. Every enthusiast and potential trader wants to know when the next crypto bull run will start. The digital currency reached an all-time high in December 2017 and since then, it has been stuck in a crypto winter.

                  As well all know, Bitcoin, is the highest rising digital asset of all time. This is partly because of Bitcoin’s speculative nature, unlimited potential, and its built-in difficulty adjustment designed to throw off the elements of supply and demand to create a balance. This increases the Bitcoin price against the USD in return. It is a major reason why the leading digital currency can potentially initiate the next crypto bull run.

                  Bitcoin (BTC) Price Today – BTC / USD
                  Read more →
                • Telegram after 5 years

                    A few years ago, when I was using Jabber, all of a sudden the centralized IMs that glue your account to your phone number became popular. I was skeptical towards them for some time, but then there was a temporary illusion that the Telegram developers were trying to do something bigger. Unfortunately, over time it was becoming clearer and clearer that they were not actually going to do anything that was different in any way from what other centralized IMs had to offer.
                    Read more →
                  • «Non-Blockchain Games Involving Money Must Die»



                      Dmitry Pichulin, known under the nick «deemru», won the game Fhloston Paradise, developed by Tradisys on the Waves blockchain.

                      The winner of Fhloston Paradise was supposed to be the player paying the very last stake during a 60-block period, before any other player could pay their stake and reset the counter to zero. The winner would collect all stakes paid by other players.

                      Dmitry's winning recipe was the bot Patrollo, which he created. The bot paid just eight 1 WAVES stakes for Dmitry and eventually won him 4,700 WAVES ($13,100). In this interview, Dmitry discusses his bot and prospects of blockchain games.

                      Read more →
                    • The History of SXSW: How It All Started

                        SXSW is a festival of culture and technology held every spring in Austin, Texas. It’s a global phenomenon, with hundreds of thousands attending the event every year and millions more following the media coverage. Even if you’ve never heard of it, you’ve certainly felt its influence on our culture.

                        But it wasn’t always that way.

                        Read more →
                      • Notifications: action required for take profit / stop loss. In case your Broker doesn't support those orders

                          There is a Russian Broker — Tinkoff Bank. Now here is the problem: the broker doesn't support take profit and stop loss orders. At all. If you want to feel more convenient while trading, then you need some workaround for this situation, until Tinkoff Bank developers finally release those orders as the killer feature. In the article, I will show you my workaround.
                          update:2019-03-22, the Broker published platform 3.0.0 (a major update) in Google Play. The changelog features take profit/stop loss orders
                          Read more →
                        • Info desk: global Internet initiatives



                            Fiber-optic cables are a great way to bring high-speed Internet right to your home or office. But even in large cities not everyone can enjoy the benefits of it, since apartments far away from everyone, or low-population districts far from downtown, are very reluctantly served by ISPs.

                            And then there’s small towns and villages, far away from the main Internet “highways”. In poorer countries, Internet is often slow and expensive even in large population centers, while villages are often left without a connection for years. To connect them to the World Wide Web takes the resources of not just normal ISPs, but telecom giants. Solar-powered drones with networking equipment, weather balloons, satellites and other similar projects are not just science fiction, but a reality today (or in the near future). But who’s closer to launch and who’s lagging behind? Let’s find out.
                            Read more →