SEARCH KEYWORD -- Problem solving


  Bug caused by using changeable value as the default in "python method overload"​

In python we can set the passed in parameter's default value to make the function has the same running feature as the method overload in Java. Define a function like this: def testFunction(self, param1, param2=None, param3=None): Normally we use "None" as the parameter's default value. We can also use str/bool as the default value, but is it OK we use empty list [] as its default value? This is our test program: """ A test program using empty list as the passed-in parameter's default value. ...

   PYTHON     2019-03-11 08:52:52

  Usability Testing Of Your App

Testing your mobile app for usability means following the best practices in app design. It is recommended if you want to keep your users. You need focus groups to test the app during its creation and after development. This process has its own drawbacks even when it is done with the traditional methods.Apparently, you will prefer real individuals as well as a fraction of the target audience to do the app testing. These people will report any unappealing feature or missing feature in its user int...

   TOP APP DEVELOPMENT COMPANIES,APP TESTING,MOBILE APP DEVELOPMENT,MOBILE APPS     2017-12-04 04:27:21

  Only 4G can resolve the conflicts between China Telecom Carriers and WeChat ?

Why WeChat has made the three big Chinese telecom companies uncomfortable? Let's analyze from both technical and commercial levels. From a technical point of view, Mr. Huang, Dean of China Mobile Research Institute, described the impact of "always online service" applications like WeChat. Instead of using technical terms, we will explain in simple vivid phrases. First, mobile QQ, or WeChat, will have their own "request frequency". These requests are sent to the carrier network, to check the re...

   4G,WeChat,Telecom,China     2013-03-25 08:28:59

  Nokia fires the Qt team

Recently, Nokia announced that they would lay off around 10000 employees, 700 of them are developers. Among these 700 developers, 100 are the core developers of the open source project Qt.Nokia is the main sponsor of the open source project Qt. According to Mirko Boehm, the core Qt team has around 100 people, this means that Nokia fires the whole Qt team.He criticized Nokia's decision, he thought that a responsible CEO should persuade the team to move to other platforms.Qt team is experienced, t...

   Nokia,Fire,Qt     2012-06-26 06:57:06

  Additional steps need to implement to setup shadow-boxV2 OPTEE on Raspberry PI

We followed the Shadow-box v2 project from the https://github.com/kkamagui/shadow-box-for-arm to set up the trustZone on Raspberry PI modeB to protect the Linux Kernel. But got a problem when doing the step: [3.6.5. Activate Shadow-Box for ARM and Start Secure Pi!] to create the hash for the memory area. The result is not shown. If you met the same problem, this is what I did to fix the problem on my PI: 1.1  When we do the step [3.5.1. Copy OP-TEE OS with Shadow-Box for ARM and N...

   HARDWARE,RASPBERRY PI     2019-05-20 08:52:55

  What’s making Drupal gain momentum among government organizations?

Drupal has come up as a big splash in the world of Website development. Whether it’s an informative website or an e-commerce store, Drupal has been successfully utilized for meeting customized web requirements. It’s not surprising to find entrepreneurs, hailing from different business verticals, choosing Drupal for powering their websites. Joining this group of elite Drupal users are the representatives of government organizations. The noticeable popularity of Drupal has indeed made ...

   Drupal     2014-03-12 08:15:43

  Find max subarray of an array

In computer science, the maximum subarray problem is the task of finding the contiguous subarray within a one-dimensional array of numbers (containing at least one positive number) which has the largest sum. For example, for the sequence of values −2, 1, −3, 4, −1, 2, 1, −5, 4; the contiguous subarray with the largest sum is 4, −1, 2, 1, with sum 6. The problem was first posed by Ulf Grenander of Brown University in 1977,...

   Max Subarray, Divide and conquer,Kadane     2013-04-22 11:50:35

  Singapore ISP SingTel experiences nation wide service down

On 3 Dec, 2016, many people from Singapore found that they were disconnected from the world the moment they waked up. Their Internet Service Provider(ISP) SingTel, the largest ISP in the country, experienced a nation wide service down incident. The incident started at 8:21 am according to SingTel and all Internet service subscribers across the country are affected. The incident lasted for over 15 hours(The time this post is being written) and there is still no timeline for when the service will ...

   SINGAPORE,SERVICE DOWN,NEWS,SINGTEL     2016-12-03 09:33:46

  MySQL index optimization

Problem description: We need to access a very big table which has 40 million records. In the table, id is the primary key and program_id is indexed. When executing a select query: select * from program_access_log where program_id between 1 and 4000 The above query executes very slowly, we thought it was because there were too many records in the table. So we added id in the where condition to limit the search so that each time only half a million records would be read. select * fr...

   MySQL,Index search, Partition     2012-12-26 13:14:20

  Practice of using spinlock instead of mutex

Spinlock and mutex are two important concepts in multithreading programs. They are used to lock some shared resource to prevent concurrent access which may affect data consistency. But they do have differences, what are the differences? when should we use spinlock instead of mutex? The Theory In theory, when a thread tries to lock a mutex and it does not succeed, because the mutex is already locked, it will go to sleep, immediately allowing another thread to run. It will continue to sleep until...

   Spinlock,Mutex,Concurrency     2014-04-19 21:54:12

RECENT