Fedora VPN

wget https://git.io/vpn -O openvpn-install.sh

References:

[1] https://www.ostechnix.com/easiest-way-install-configure-openvpn-server-linux/ 

[2] https://kifarunix.com/install-and-setup-openvpn-server-on-fedora-29-centos-7/2/

Reopen connection after close during openvpn execing 

Linux:

Connection drop after active openvpn 

/etc/sysctl.conf
net.ipv4.ip_forward = 1   

Windows:

https://www.geeknetic.es/Noticia/10486/Trucos-Como-usar-una-VPN-accediendo-a-Internet-con-tu-conexion-local.html

https://tutorialesenlinea.es/409-conectar-por-vpn-sin-perder-la-conexion-a-internet.html

https://social.technet.microsoft.com/Forums/es-ES/044c7659-3f63-42fd-b15f-f75a4291c080/conectarse-por-vpn-a-un-equipo-remoto-y-perder-la-conexin-a-internet-con-los-demas-programas?forum=servinfoeslatames

http://elblogdejuanbo.blogspot.com/2011/10/conexion-desde-casa-una-vpn-sin-perder.html

Python plot maps and polygons

Map Resources:
[1] http://www.arcgis.com/home/item.html?id=3fd6eb2de569477ca83b2b65da8ecb6f

Source for plot:
[1]


Aditional Lectures
[1] http://dan-scientia.blogspot.com/2009/10/centroide-de-um-poligono.html
[2] https://www.matematica.pt/faq/poligono-convexo.php
[3] https://github.com/deparkes/shapely_tests
[4] https://shapely.readthedocs.io/en/stable/manual.html
[5] https://en.wikipedia.org/wiki/Centroid#Centroid_of_polygon
[6] Centro Geodesico https://ww2.ibge.gov.br/home/geociencias/geodesia/artigos/1996_Centro_Geodesico_Centroide.pdf

Visual Center
[1] https://blog.mapbox.com/a-new-algorithm-for-finding-a-visual-center-of-a-polygon-7c77e6492fbc
[2] https://github.com/mapbox/polylabel
[3] Poly Decomp https://mpen.ca/406/motivation

Python basemap
[1] https://matplotlib.org/basemap/users/examples.html
[2] https://github.com/matplotlib/basemap/tree/master/examples

sudo apt-get install libgeos-3.5.0
sudo apt-get install libgeos-dev
sudo pip install https://github.com/matplotlib/basemap/archive/master.zip

Results:

https://github.com/fincahuanaco/covid19peru 

Next Step

https://towardsdatascience.com/easy-steps-to-plot-geographic-data-on-a-map-python-11217859a2db

Deep Learning

Resources

[1] Classification 6 class (pt) https://www.linkedin.com/pulse/classifica%C3%A7%C3%A3o-de-imagens-atrav%C3%A9s-deep-learning-s%C3%A9rgio-saraiva/

1) http://demo.caffe.berkeleyvision.org/
2) http://playground.tensorflow.org

Additional
[1] https://medium.com/analytics-vidhya/python-implementation-of-andrew-ngs-machine-learning-course-part-1-6b8dd1c73d80


Classify Dog/Cat (Under evaluation)

1) https://medium.com/@harsathAI/cats-and-dogs-classifier-convolutional-neural-network-with-python-and-tensorflow-9-steps-of-6259c92802f3

2) https://towardsdatascience.com/image-classifier-cats-vs-dogs-with-convolutional-neural-networks-cnns-and-google-colabs-4e9af21ae7a8


3) https://github.com/georgeblu1/Dog-Vs-Cat

4) https://github.com/girishkuniyal/Cat-Dog-CNN-Classifier


Google tools
[1] Big picture  https://research.google.com/bigpicture
[2] Database Search https://toolbox.google.com/datasetsearch/search

Movies for Sant Week

References:
[1] https://www.aciprensa.com/noticias/15-peliculas-recomendadas-para-semana-santa-25819
[2] https://listas.20minutos.es/lista/las-mejores-peliculas-para-ver-en-semana-santa-2010-201488/

Running Corriendo Corrida

Resultados
[1] 2014 Lanpass 10K http://www.chiptiming.com.pe/resultados-busqueda-lan.php
[2] 2014 Pucp 7.7K https://www.scribd.com/doc/307501769/Resultados-PUCP-7-7k-Generales
              http://aeg.pucp.edu.pe/correpucp14/emailing/Resultados%20PUCP%207.7k%20-%20Generales.xls
[3] 2015 Unesp 15K http://www.runnerbrasil.com.br/Calendario/2015/0614/Unicep/Unicep_15M.txt

[4] 2018 10K http://www.circuitosaudeevida.com.br/etapa-2-sao-carlos-resultado/


[5] 2019 8K http://servicos.saocarlos.sp.gov.br/esportes/carnaval/8MASC.pdf

[6] 5-May 2019 10K https://www.ravelisports.com/resulatado
                                 https://docs.wixstatic.com/ugd/3b092b_8597b38e29b04f0a9882bc07c5c23bf4.pdf
   Fotos: https://www.facebook.com/portalsanca/photos/a.2333725136911019/2333778633572336/?type=3&theater

Tools:
[1] Compute Rhythm and times (ES)
https://runfitners.com/calculadora-de-tiempo-y-ritmos-de-carrera-para-runners/

Computer Graphics Lectures

Resources:
[1] Lecture Rasterization and Antialising http://www.cs.cornell.edu/courses/cs4620/2018sp/
[2] rasterization http://cseweb.ucsd.edu/classes/wi18/cse167-a/
[3] Slides Antialiasing http://graphics.stanford.edu/courses/cs248-18-spring-content/lectures/02_drawtriangle/02_drawtriangle_slides.pdf
[4] 3D Graphics with OpenGL https://www.ntu.edu.sg/home/ehchua/programming/opengl/cg_basicstheory.html
[5] Flex SDK Tutorial for Fluid and others https://docs.nvidia.com/gameworks/content/gameworkslibrary/physx/flex/manual.html
[6] SPH by Sampling https://nccastaff.bournemouth.ac.uk/rsouthern/publications/sphsampling/

Offline Handwritten Signature Verification - Resources

Source code:

[1] https://github.com/adarshsrivastava11/sbi


[2] Kaggle https://www.kaggle.com/divyanshrai/training-using-greyscale

[3] Dataset https://www.kaggle.com/divyanshrai/handwritten-signatures


Scanned Documents
[1] Tobacco-800  https://github.com/prittt/YACCLAB


Object Detection
[1] https://pjreddie.com/darknet/yolo/

Related
[1] https://medium.com/@everisUS/handwritten-signature-verification-with-neural-networks-94da5cbe0c5f

Latex \printnomenclature doesn't work

Add to TexStudio or your favorite editor, the user command:

makeindex %.nlo -s nomencl.ist -o %.nls

And for update, compile, execute the above user command, and compile again.

Ubuntu 16 - VMWare Player 12 - GCC Not found

First solution
cd /usr/lib/vmware/modules/source 
wget https://github.com/mkubecek/vmware-host-modules/archive/player-12.5.9.zip 
unzip player-12.5.9.zip 
cd vmware-host-modules-player-12.5.9/vmmon-only/ 
make 
cd ../vmnet-only/ 
make 
cd .. 
mkdir /lib/modules/`uname -r`/misc 
cp vmmon.o /lib/modules/`uname -r`/misc/vmmon.ko 
cp vmnet.o /lib/modules/`uname -r`/misc/vmnet.ko 
depmod -a /etc/init.d/vmware restart


Second solution

mkdir ~/vmmodules #create a temp folder and copy files.
cp /usr/lib/vmware/modules/source/vmnet.tar /usr/lib/vmware/modules/source/vmmon.tar ~/vmmodules/ 
# make the modules manually 
tar -xvf vmmon.tar 
cd vmmon-only 
make 
cd .. 
sudo cp vmmon.o /lib/modules/`uname -r`/kernel/drivers/misc/vmmon.ko.gz 
tar -xvf vmnet.tar 
cd vmnet-only 
make 
cd .. 
sudo cp vmnet.o /lib/modules/`uname -r`/kernel/drivers/misc/vmnet.ko.gz 
#Then reload the modules and restart vmware service, vmplayer should works now. 
sudo depmod -a 
sudo systemctl restart vmware


Thrid solution

#install the right version of gcc
$sudo apt-get install g++-4.9 

Trick

$sudo sed 's/gcc version 5.4.0/gcc version 6.4.0/' /proc/version > /tmp/version
$sudo mount --bind /tmp/version /proc/version
$sudo vmware-modconfig --console --install-all
$sudo umount /proc/version && rm /tmp/version

Final solution 2019
Update kernel from 4.4 to 4.11 works good[2] and download from [3].

References:
[1] https://unix.stackexchange.com/questions/310637/vmware-kernel-module-a-compatible-version-of-gcc-was-not-found
[2] Update kernel https://www.howtoforge.com/tutorial/how-to-upgrade-linux-kernel-in-ubuntu-1604-server/
[3] Ubuntu kernels https://kernel.ubuntu.com/~kernel-ppa/mainline/
[4] Update Ubuntu 18 kernel https://www.tecmint.com/upgrade-kernel-in-ubuntu/ 

GTK Samples

Resources:
[1] GTK Drawing https://developer.gnome.org/gtk3/stable/ch01s05.html

MultiSeat Architecture

References:
[1] https://support.userful.com/Manuals/Userful_Desktop/HowTo/VideoCardToUSB

[2] Def https://en.wikipedia.org/wiki/Multiseat_configuration
[3] Software https://www.geckoandfly.com/23654/virtual-desktop-software-multiple-users/
[4] Remote Desktop https://www.tecmint.com/best-remote-linux-desktop-sharing-software/

Cuda Installation resources

Cuda 10:
[1] last version https://developer.nvidia.com/cuda-downloads
Cuda 8:

#error -- unsupported GNU version! gcc versions later than 5 are not supported!
#error -- unsupported GNU version! gcc versions later than 5 are not supported!

$ sudo ln -s /usr/bin/gcc-4.9 /usr/local/cuda/bin/gcc
$ sudo ln -s /usr/bin/g++-4.9 /usr/local/cuda/bin/g++

nvcc warning : The 'compute_20', 'sm_20', and 'sm_21' architectures are deprecated, and may be removed in a future release (Use -Wno-deprecated-gpu-targets to suppress warning).



[1] https://developer.nvidia.com/cuda-80-ga2-download-archive

Fluid animation tools

Courses:
[1] bridson https://www.cs.ubc.ca/~rbridson/fluidsimulation/

Resources and Source Code:
[1] PBD http://www.interactive-graphics.de/index.php/research/108-a-survey-on-position-based-dynamics-2017

mySQL ODBC Driver error 5.2

Error 1918. Error installing ODBC driver MySQL ODBC
 5.3 ANSI Driver, ODBC error 13: The setup routines for
 the MySQL ODBC 5.3 ANSI Driver ODBC driver could
 not be loaded due to system error code 126: The

Solution:
MySQL Connector/ODBC requires Microsoft Visual C++ 2010 redistributable so you have to install it first.

Resources:
  [1]  MySQL Connector/ODBC 32-bit version, you have to download and install Microsoft Visual C++ 2010 Redistributable Package (x86).
  [2]  MySQL Connector/ODBC 64-bit version, you have to download and install Microsoft Visual C++ 2010 Redistributable Package (x64).

mySQL try to Optimize

References:

[1] https://dev.mysql.com/doc/refman/5.7/en/insert-optimization.html

[1] connection options https://dev.mysql.com/doc/connector-odbc/en/connector-odbc-configuration-connection-parameters.html#codbc-dsn-option-flags
[2] autocommit problem http://www.mysqlab.net/knowledge/kb/detail/topic/innodb/id/5934
[3] 101 tips https://www.monitis.com/blog/101-tips-to-mysql-tuning-and-optimization/
[4] Create table  https://dev.mysql.com/doc/refman/8.0/en/create-table.html

Bluetooth resources

Resources:
[1] http://people.csail.mit.edu/albert/bluez-intro/index.html

Factura electronica - Perú

Padrón de RUC

[1] ~428MB http://www.sunat.gob.pe/descargaPRR/mrc137_padron_reducido.html
[2] Servicio online ruc.com.pe


Recursos:
[1] Tutorial facturación electrónica  https://www.noticierocontable.com/facturador-sunat/


[2] http://clubdecontadores.com/conoce-cinco-mitos-uso-las-facturas-electronicas/
[3] Factura electronica http://revistas.pucp.edu.pe/index.php/revistalidera/article/viewFile/16873/17181
[4] http://cpe.sunat.gob.pe/factura-desde-los-sistemas-del-contribuyente

Software:
[1] http://orientacion.sunat.gob.pe/index.php/empresas-menu/comprobantes-de-pago-empresas/comprobantes-de-pago-electronicos-empresas/facturador-sunat/6785-03-requisitos-para-su-uso

Servicio online privados
[1] jperez https://sistema.susii.net/login
[2] admin https://demo.developer-technology.com/facturacion_electronica/login.php

Proveedores:

[1] PSE http://cpe.sunat.gob.pe/quien-es-el-proveedor-de-servicios-electronicos-pse

[2] Listao PSE http://orientacion.sunat.gob.pe/index.php/empresas-menu/comprobantes-de-pago-empresas/comprobantes-de-pago-electronicos-empresas/see-desde-los-sistemas-del-contribuyente/2-comprobantes-que-se-pueden-emitir-desde-see-sistemas-del-contribuyente/factura-electronica-desde-see-del-contribuyente/3550-padron-de-proveedores-de-servicios-electronicos-pse

[3] Homologación http://orientacion.sunat.gob.pe/images/cdp-electronicos/padron-pse/ManualHomologacinPSEagosto2016.pdf
PSE Precio https://www.nubefact.com/precios
[4] https://portal.efact.pe/soluciones/factura-electronica-plataforma-online.html

Dynamic DNS

FQDN (Fully Qualified Domain Name)

• Pc name: "deb"
• Domain name: "bar.com"

O FQDN is: "deb.bar.com."


Alternatives

[1] http://neorouter.com/products-nrfree

TensorFlow Example for learn

Examples:

[1] https://github.com/aymericdamien/TensorFlow-Examples/tree/master/notebooks/3_NeuralNetworks



Tensor decomposition (for read)

[1] https://github.com/Large-Scale-Tensor-Decomposition/tensorD
[2] https://smile-lab-tensord.readthedocs.io/en/latest/guide_decomposition.html

private VPN Services

Resources:

[1] Compare https://www.wizcase.com/best-vpns-for-brazil
[2] Perú https://www.vpnfan.com/blog/best-lima-vpns/
[3] Providers Pt https://canaltech.com.br/internet/descubra-por-que-usar-uma-vpn-e-veja-como-escolher-a-melhor/

Postgres Lectures for improve performance

References:
[1] https://revs.runtime-revolution.com/streaming-data-in-postgres-43c502a6732
https://revs.runtime-revolution.com/streaming-data-in-postgres-43c502a6732
[2] https://blog.timescale.com/scalable-postgresql-high-availability-read-scalability-streaming-replication-fb95023e2af/
[3] https://www.pipelinedb.com/
[4] https://www.citusdata.com/blog/2017/11/08/faster-bulk-loading-in-postgresql-with-copy/
[5] https://dzone.com/articles/postgresql-vs-hadoop

Stream Music from your Linux PC to Android Cellphone Speaker

1) SoundWire

2) WiFiAudio Server for Linux 64bit

References:
[1] Client https://appuals.com/stream-audio-pc-android-device/
[2] Server http://georgielabs.net/
[3] http://wifiaudio.boards.net/thread/2/wifiaudio-support-links-download-application
[4] WifiAudio Sever Linux 64bits http://wifiaudio.boards.net/attachment/download/6

Linux Remote Desktop

sudo apt-get update
sudo apt-get install xrdp 

#desktop

sudo apt-get install mate-core mate-desktop-environment mate-notification-daemon

#setting session

sudo sed -i.bak '/fi/a #xrdp multiple users configuration \n mate-session \n' /etc/xrdp/startwm.sh

#firewall

sudo ufw allow 3389/tcp

#Use remmina desktop to connect

Extra

service --status-all

printf 'Desktop: %s\nSession: %s\n' "$XDG_CURRENT_DESKTOP" "$GDMSESSION"

References:
[1] Setting xrdp https://medium.com/@vivekteega/how-to-setup-an-xrdp-server-on-ubuntu-18-04-89f7e205bd4e
[2] https://websiteforstudents.com/connect-to-ubuntu-16-04-17-10-18-04-desktop-via-remote-desktop-connection-rdp-with-xrdp/
[3] Print desktop name and session
https://askubuntu.com/questions/72549/how-to-determine-which-window-manager-is-running

SSH Skip port forwarding

Instant terminal sharing
https://tmate.io/


Share your UNIX terminal in seconds!
https://www.teleconsole.com/

Share local machine port to public access
https://serveo.net/
https://github.com/milio48/serveo
$wget https://raw.githubusercontent.com/milio48/serveo/master/serveo.sh 

$./serveo.sh tcp 5432 0

vs ngrok
Serveo is an excellent alternative to ngrok. Serveo was inspired by ngrok and attempts to serve many of the same purposes. The primary advantage of Serveo over ngrok is the use of your existing SSH client, so there's no client application to install.

Other slight advantages include preservation of URLs across reconnect for free (ngrok allows this only for paid accounts) and in-terminal request inspection and replay (ngrok uses a web interface).

vs OpenSSH

Using Serveo instead of OpenSSH frees you from having to configure and maintain a server. It also handles HTTPS and subdomain generation, two features that complicate a typical SSH port-forwarding setup.

Apache Guacamole is a clientless remote desktop gateway


http://guacamole.apache.org/


Manual mode (A like to connect to B)

PCA ----+----  PCB
            |
          PCX

Server Side (PCX Need root permission)

$sudo vi /etc/ssh/sshd_config

AllowTcpForwarding yes
GatewayPorts yes


$sudo firewall-cmd --add-port=7004/udp [--permanent]
$sudo firewall-cmd --add-port=7004/tcp [--permanent]

Target PCB

$ssh -f -N -R 7004:127.0.0.1:22 -l user_PCX -p port PCX(ip/domain name)
This means open port 7004 on PCX forwarding to port 22, PCX will start to listen on port 7004.

Source PCA
$ssh PCX(ip/domain name) -l user_PCB -p 7004

Enjoy!



References:
[1] https://rootsaid.com/ssh-without-port-forwarding/
[2] https://linuxhint.com/ssh-port-forwarding-linux/
[3] https://dev.to/samuyi/the-how-to-of-ssh-port-forwarding-1f4e

Course of Deep Learning

Resources:
[1] Cutting-Edge Trends in Deep Learning and Recognition http://slazebni.cs.illinois.edu/spring17/
[2] Course Deep Learning https://nthu-datalab.github.io/ml/
[3] Colab https://medium.com/deepquestai/train-object-detection-ai-with-6-lines-of-code-6d087063f6ff

Review documents

Resources:

[1] https://www.visaoerevisao.com
[2] https://www.editage.com.br
[3] http://www.nativeenglish.com.br/ (word)

Ubuntu route (s)

ip route list

route

route add -net 10.0.0.0 netmask 255.0.0.0 gw 10.169.5.1



sudo route del -net 192.168.76.0/24
and
sudo route del -net 192.168.76.0 netmask 255.255.255.0


References:
[1] https://www.cyberciti.biz/faq/linux-route-add/

mySql Optimize date queries and inserts

High Level of use



DROP INDEX VENTAS_fecven_idx ON VENTAS

select * from VENTAS where date(fecven)='2019-03-09' #~2.81

select * from VENTAS where fecven >='2019-03-09 00:00:00' and fecven<'2019-03-10 00:00:00'  #~2.9


select * from VENTAS where fecven Between '2019-03-09 00:00:00' and '2019-03-10 00:00:00'  #~3.6


CREATE INDEX VENTAS_fecven_idx ON VENTAS (fecven)


select * from VENTAS where date(fecven)='2019-03-09' #~2.794

select * from VENTAS where fecven >='2019-03-09 00:00:00' and fecven<'2019-03-10 00:00:00'  #~0.265

select * from VENTAS where fecven Between '2019-03-09 00:00:00' and '2019-03-10 00:00:00'  #~0.261

CREATE INDEX MOVPRO_fecmov_idx ON MOVPRO (fecmov)
#change date(fecmov) between f1 and f2
#to         fecmov between f1 and f2  #implicit add 00:00:00

DROP INDEX MOVPRO_fecmov_idx ON MOVPRO


Setting mysql

SET GLOBAL bulk_insert_buffer_size = 1024 * 1024 * 128;
[mysqld]
bulk_insert_buffer_size=128M

References
[1] Insert https://dev.mysql.com/doc/refman/8.0/en/insert-optimization.html
[2] Amazon Best Practices https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_BestPractices.html

Linux Discovery ports

Mac
sudo lsof -iTCP -sTCP:LISTEN


Linux
List used ports 
$netstat -tulpn | grep LISTEN

tcp        0      0 127.0.0.1:5939          0.0.0.0:*               LISTEN      -                  
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      -                  
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      -                  
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      -                  
tcp6       0      0 :::80                   :::*                    LISTEN      -                  
tcp6       0      0 :::22                   :::*                    LISTEN      -                  
tcp6       0      0 ::1:631                 :::*                    LISTEN      -

List process that using port
You like to knows who is using port 80, then

$sudo lsof -i :80
apache2   965     root    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13794 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13795 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13796 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13797 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)
apache2 13798 www-data    4u  IPv6  26650      0t0  TCP *:http (LISTEN)


Second option

$sudo netstat -peanut | grep ":80"
tcp6       0      0 :::80                   :::*                    LISTEN      0          26650      965/apache2

Setting apache
$vi /etc/apache2/apache2.conf

#       /etc/apache2/
#       |-- apache2.conf
#       |       `--  ports.conf
#       |-- mods-enabled
#       |       |-- *.load
#       |       `-- *.conf
#       |-- conf-enabled
#       |       `-- *.conf
#       `-- sites-enabled
#               `-- *.conf