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  Set up Superset on ubuntu 16.04 LTS

Apache Superset (incubating) is a modern, enterprise-ready business intelligence web application. Compared with business-focused BI tool like Tableau, superset is more technology-navy. It supports more types of visualization and able to work in distributed manner to boost the query performance. Most importantly, it is free of charge! An example dashboard: Let’s go and set it up. Create a virtualenv Assume Anaconda is installed for python management. # create a virtualenv with python 3.6 co...

   TUTORIAL,UBUNTU,SUPERSET     2019-10-19 21:34:55

  2D Indoor CQB Robot Simulation

Program Design Purpose: The integration of robots in Close Quarters Battle (CQB) represents a significant advancement in modern military and law enforcement tactics. These robots, designed to navigate tight spaces, gather real-time intelligence, and engage threats, are invaluable assets in high-stakes scenarios. Our goal is to develop a 2D tactical board simulation system, similar to a computer game, that can load building floor blueprints, display CQB squad (robot) positions, enemy locations, ...

       2024-08-11 08:40:31

  Features of Google Android 4.1 Jelly Bean

In today's Google IO 2012 in San Francisco, Google announced its new Android system Android 4.1 Jelly Bean. It's a whole new Android OS and many new features are added to it. Let's check out what new features are added to Jelly Bean.1.  Projector ButterIt uses VSync and Tripple buffering to improve the interactivity experience and increase frame rate. It makes Jelly Bean the fastest and smoothest Android ever2. New home screenYou can customize the home screen. You can re-size the home scree...

   Android, Google IO, Android 4.1, Kelly Bean     2012-06-27 12:49:49

  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

  String.length() vs String.getBytes().length in Java

In Java, String.length() is to return the number of characters in the string, while String.getBytes().length is to return the number of bytes to represent the string with the specified encoding. By default, the encoding will be the value of system property file.encoding, the encoding name can be set manually as well by calling System.setProperty("file.encoding", "XXX"). For example, UTF-8, Cp1252. In many cases, String.length() will return the same value as String.getBytes().length, but in some ...

   Java,UTF8,String,Encoding,Sample     2015-04-01 22:22:23

  Cybertruck's 48V Power: Revolutionizing Automotive Standards

Tesla's Cybertruck commenced its deliveries in the United States this month, marking a significant milestone for the innovative pickup. Distinguished by its unique design, the Cybertruck features a cargo bed panel that opens to facilitate easy loading of goods. This groundbreaking vehicle has achieved numerous world-first distinctions: The world's inaugural stainless steel car, boasting a body reportedly resistant to bullets. Its angular shape adds an extra layer of safety, causing severe col...

   FORD,48V,CYBERTRUCK,TESLA     2023-12-24 17:06:59

  Python SSH Connection Tools

Program Design Purpose: We aim to create a simple Python SSH tool library that facilitates SSH communication, SCP file transfer, and SSH port forwarding through multiple jump hosts in an SSH tunnel chain. The library is designed to provide a simple API for establishing nested SSH tunnel connections through multiple jump hosts with customizable TCP ports. This allows users or their programs to automate SSH tasks such as: Batch processing SSH connection tasks, such as connecting to multiple ser...

       2024-08-30 04:46:05

  Unknown system variable 'query_cache_size' in DbVisualizer while accessing MySQL

DbVisualizer is a very popular GUI application to view the data stored on a database. It supports various databases such as Oracle, MySQL etc. It relies on different database drivers to connect to the database server and access the data stored there.  In this post, we will try to solve one problem when accessing the latest MySQL database(8.0+) through DbVisualizer. MySQL database starting from 8.0 has lots of changes which may not be compatible with old version of software or libraries whic...

   MYSQL,MYSQL 8,DBVISUALIZER,QUERY_CACHE_SIZE     2018-06-30 03:48:17

  How can you test if your VPN is working properly?

Installing a VPN on your device is one of the essential steps you need to take in order to have a safe and pleasant online experience. It good functioning is in your best interest and this is why you need to make sure that your VPN is working properly. Unfortunately, a lot of problems can occur if it turns out that your VPN is not up to the task and that it has some leaks.  Can a leak really occur? To answer you most directly – Yes! Yes, it can! Unfortunately, no system is perfect an...

   VPN     2020-09-17 06:53:19

  Generating CSR using Java

A CSR(Certificate Signing Request) is a kind of request generated by an application and is to be sent to a Certificate Authority to create a signed certificate which can be distributed. It usually contains certificate information such as subject name, public key info and signature info. In Java, keytool can be used to generate a certificate request with option -certreq.  But sometimes if an application wants to create a CSR programmatically, keytool will not do a favor, instead you should u...

   JAVA,SECURITY,CSR,CERTIFICATE REQUEST     2016-05-25 04:49:17

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