Belajar Bareng Pengembangan Software: 2020

Terpikir tentang topik menghitung objek kecil dalam gambar karena melihat Fish Counter [1], tapi sayangnya, aplikasinya berbayar. Apakah ada solusi opensource yg ditawarkan untuk melakukan hal yang sama ?

DotDotGoose [2] dapat digunakan sebagai alat bantu untuk menghitung objek secara manual. OpenCFU [3], sepertinya bisa otomatis, biasa digunakan untuk menghitung koloni bakteri, belum dicoba karena belum tersedia versi untuk OSX nya.

Referensi

Fish Counter, https://play.google.com/store/apps/details?id=org.bevylabs.shrimpvision
DotDotGoose, https://github.com/persts/DotDotGoose
OpenCFU, http://opencfu.sourceforge.net/

Friday, 12 June 2020

Berkenalan dengan WebAssembly

...

Referensi

WebAssembly, https://webassembly.org/

Thursday, 11 June 2020

IMS Question & Test Interoperability (QTI) Specification

Referensi

IMS Question & Test Interoperability (QTI) Specification, http://www.imsglobal.org/question/index.html
QTI, https://en.wikipedia.org/wiki/QTI
Explore QTI in depth, https://www.ibm.com/developerworks/library/x-qti/index.html
The Importance of IMS Certification and QTI Compliance, https://www.taotesting.com/blog/importance-ims-certification-qti-compliance/
QTI.JS is a Javascript-based, free and open-source, delivery engine for tests and assessments, http://qtihub.org/

Wednesday, 27 May 2020

TAO - Assesment Platform

Panduan pertanyaan :

Bagaimana cara membuat item test secara programatik ? Solved
Bagaimana cara membuat QTI/APIP Test Content Package secara programatik ?

Versioning Custom Fork

Untuk versioning nama rilis, penilasannya kita menggunakan tambahan 1 digit increment dibelakkang versi rilis resmi dari upstream-nya, contoh, untuk v2.24.1 tao-test-runner-qti-fe maka setiap kali melakukan perubahan kita akan menggunakan nama rilis v2.24.1.1, v2.24.1.2, dst-nya

Config Git

git config --global url."https://github".insteadOf git://github

Intalasi

Official Docker Install

docker run -ti --name taotesting-core -p 8080:80 taotesting/core:latest

Informasi lebih lengkap baca disini, https://www.accelerate.taotesting.com/core-docker-install-0

Debian

sudo apt update

sudo apt install -y curl wget gnupg2 ca-certificates lsb-release apt-transport-https

wget https://packages.sury.org/php/apt.gpg

sudo apt-key add apt.gpg

echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php7.list

sudo apt update

sudo apt install nginx php7.4 php7.4-fpm php7.4-cli php7.4-common mariadb-server mariadb-client php7.4-xml php7.4-zip php7.4-curl php7.4-mbstring php7.4-mysql curl wget zip tidy unzip composer php7.4-dev php7.4-redis php-redis libmcrypt-dev php-pear nodejs npm redis redis-server

sudo npm install npm@latest -g

sudo pecl channel-update pecl.php.net

sudo pecl install mcrypt-1.0.1

Ini hanya digunakan jika menggunakan PHP 7.2 atau 7.3

sudo nano /etc/php/7.2/cli/php.ini

extension=mcrypt.so

git clone ....

composer install

Ketika melakukan composer install, ada warning :

Package flow/jsonpath is abandoned, you should avoid using it. Use softcreatr/jsonpath instead.
Package imsglobal/lti is abandoned, you should avoid using it. No replacement was suggested.
Package phpunit/php-token-stream is abandoned, you should avoid using it. No replacement was suggested.
Package zendframework/zend-code is abandoned, you should avoid using it. Use laminas/laminas-code instead.
Package zendframework/zend-eventmanager is abandoned, you should avoid using it. Use laminas/laminas-eventmanager instead.
Package zendframework/zend-servicemanager is abandoned, you should avoid using it. Use laminas/laminas-servicemanager instead.

Warning ini bisa diabaikan.

Di file konfigurasi config/generis.conf.php, dua nilai berikut tidak boleh Kita ubah : LOCAL_NAMESPACE dan GENERIS_INSTANCE_NAME

MySQL

sudo su -

mysql

create database <database>;

create user '<user>'@'localhost';

set password for '<user>'@'localhost' = PASSWORD('<password>');

grant all privileges on <database>.* to '<user>@'localhost' identified by '<password>';

flush privileges;

quit

exit

Pastikan, semua tabel harus menggunakan engine InnoDB.

PostgreSQL

...

taoEdge

Ketika kita ingin menginstall versi terbaru tao dari github, setiap extension nya kita gunakan versi terbaru, jika kita mencoba menginstall nya dengan web installer, maka pada saat tulisan ini dibuat, masih terjadi error seperti saya laporkan di forum. Tapi, jika kita menggunakan command line installer, masalah ini tidak akan terjadi :

#!/bin/bash

php tao/scripts/taoInstall.php --db_driver=pdo_pgsql --db_host=localhost --db_name=tao --db_pass=password --db_user=tao --file_path=/path/to/tao-data-dir --timezone="Asia/Jakarta" --url=http://tao.openthinklabs --user_login="username" --user_pass="password" --verbose --operated_by_name="OpenThink Labs" --operated_by_email="info@openthinklabs.com"

Enable MathJax

cd package-tao ;

wget -c https://hub.taotesting.com/resources/taohub-articles/articles/third-party/MathJax_Install_TAO_3x.sh

chmod +x MathJax_Install_TAO_3x.sh

./MathJax_Install_TAO_3x.sh

Konfigurasi MathJax nya dapat dilakukan di : tao/views/templates/client_config.tpl

Selengkapnya Baca https://hub.taotesting.com/articles/third-party-tools-and-libraries/enable-math-expression-in-items

Guest Access

Activate Guest Access

sudo -u www-data php index.php 'oat\taoDeliveryRdf\scripts\ToggleGuestAccess' on

Deactivate Guest Access

sudo -u www-data php index.php 'oat\taoDeliveryRdf\scripts\ToggleGuestAccess' off

Menghapus semua Konten di TAO

[2] Menjelaskan dengan cukup detail :

1. Hapus semua taoItems

sudo -u www-data php index.php 'oat\tao\scripts\tools\CleanClass' taoItems_models_classes_ItemsService taoItems

2. Hapus semua konten dari :

/data/generis/cache

/data/generis/serviceState

/data/tao/private

/data/tao/public

/data/taoItems/itemData

/data/taoQtiItem

/data/taoQtiTest

/data/tmp

3. Hapus/truncate semua data di tabel variables_storage, results_storage

TAO Config

Javascript Operation Timeout

Kita harus menaikkan nilai timeout javascript di

config/tao/js.conf.php

, menjadi nilai yang lebih tinggi, dapat disamakan dengan timeout global yg kita definisikan di php-fpm ataupun nginx, disini saya definisikan timeout nya 300 deik.

Extensions

Extensions manager

Extension dapat diinstall via web atau via CLI. Agar dapat menginstall extension via web, pastikan menset nilai DEBUG_MODA = true di config/generis.conf.php.

Jika via CLI, dapat menggunakan perintah : php tao/scripts/installExtension.php, informasi selengkapnya baca dokumentasi https://hub.taotesting.com/articles/how-to-make-a-new-extension-3-0-v2/how-to-install-an-extension

1. oat-sa/generis

Task queue logging, https://github.com/oat-sa/generis/pull/882

Feature/fluentd handler configure with fqcn, https://github.com/oat-sa/generis/pull/880

Feature/enhance cloud watch logs json formatter, https://github.com/oat-sa/generis/pull/879

2. oat-sa/tao-core

Jika DEBUG_MODE di config/generis.conf.php diset false, maka pada halaman extension manager, bagian Available Extensions tidak akan muncul.

3. oat-sa/extension-tao-community

....

4. oat-sa/extension-tao-funcacl

....

5. oat-sa/extension-tao-dac-simple

....

6. oat-sa/extension-tao-testtaker

....

7. oat-sa/extension-tao-group

....

8. oat-sa/extension-tao-item

....

9. oat-sa/extension-tao-itemqti

....

10. oat-sa/extension-tao-itemqti-pci

.....

12. oat-sa/extension-tao-itemqti-pic

....

13. oat-sa/extension-tao-test

14. oat-sa/extension-tao-testqti

Bagaimana cara agar timer ujian berhenti ketika misalnya koneksi internet putus ?

'timer' => array(
'target' => 'client'
),
.....
'bootstrap' => array(
'serviceExtension' => 'taoQtiTest',
'serviceController' => 'Runner',
'timeout' => 5,
'communication' => array(
'enabled' => true,
'type' => 'poll',
'extension' => null,
'controller' => null,
'action' => 'messages',
'syncActions' => array(
'move',
'skip',
'storeTraceData',
'timeout',
'exitTest'
),
'service' => null,
'params' => array(
)
)
),
.....

Untuk informasi lebih detail tentang extention ini dapat membaca :

Enhance the user experience with Test Plugins, https://github.com/oat-sa/taohub-articles/blob/master/articles/Test%20Runner%20Plugins/test-runner-plugins.md

https://forum.taotesting.com/discussion/66/stop-timer-while-question-itm-is-loading

https://hub.taotesting.com/techdocs/tao-testqti/test-runner-config

https://github.com/oat-sa/extension-tao-testqti/blob/master/config/default/testRunner.conf.php

15. oat-sa/extension-tao-outcome

....

16. oat-sa/extension-tao-outcomeui

RE-228: fix: show trace variables of answer on result page, https://github.com/oat-sa/extension-tao-outcomeui/pull/370

17. oat-sa/extension-tao-outcomerds

...

18. oat-sa/extension-tao-outcomekeyvalue

....

19. oat-sa/extension-tao-outcomelti

....

20. oat-sa/extension-tao-delivery

....

21. oat-sa/extension-tao-lti

.....

22. oat-sa/extension-tao-ltideliveryprovider

....

23. oat-sa/extension-tao-revision

....

24. oat-sa/extension-tao-mediamanager"

Feature/AUT-17/Support multiple column layout in passage, https://github.com/oat-sa/extension-tao-mediamanager/pull/250

Feature/con 271/store css within passages, https://github.com/oat-sa/extension-tao-mediamanager/pull/250

25. oat-sa/extension-tao-lti

....

26. oat-sa/extension-pcisample

Feature/tr 552 make text reader pci to ims compliant, https://github.com/oat-sa/extension-pcisample/pull/87

27. oat-sa/extension-tao-backoffice

....

28. oat-sa/extension-tao-proctoring

Delivery dapat dihentikan secara otomatis ketika waktu mengerjakan telah mencapai batas akhir yg ditentukan.

Tuning Proctoring

Untuk tuning dapat memperhatikan konfigurasi berikut :

config/taoProctoring/DeliveryMonitoring.conf.php

config/taoProctoring/DeliveryLog.conf.php

29. oat-sa/extension-tao-clientdiag

feat: update os/browser compatibility list, https://github.com/oat-sa/extension-tao-clientdiag/pull/290

30. oat-sa/extension-tao-eventlog

....

31. oat-sa/extension-tao-task-queue

...

32. oat-sa/extension-tao-testqti-previewer

....

33. oat-sa/extension-tao-oauth

....

34. oat-sa/extension-tao-theming-platform

Ketika proses instalasi error, hapus ekstensi ini dari daftar di config/generis/installation.conf.php kemudian edit file config/generis/filesystem.conf.php dan tambahkan :

'themingAssetsStorage' => 'default'

Jika sudah, klik install. Tampilannya akan seperi ini :

Hanya saja, ketika mencoba upload file css, masih error, dengan pesan berikut :

{

"success": false,

"type": "Exception",

"message": "No datasource defined for taoThemingPlatform data storage.",

"data": {

"ExceptionType": "common_Exception"

}

Versi ekstension yang digunakan v5.1.0.

Jika ingin mengubah themes secara hardcode dapat dilakukan dengan cara berikut :

1. Buat class theme di : tao/models/classes/theme/OpenThinkLabsTheme.php

2. Edit class theme default yang digunakan menjadi class theme yg sudah kita buat diatas. config/tao/theming.conf.php

3. Edit file tao/views/build/grunt/sass.js, lalu tambahkan scss untuk theme kita :

tao: {
files : {
'../css/tao-main-style.css' : '../scss/tao-main-style.scss',
'../css/tao-3.css' : '../scss/tao-3.scss',
'../css/openthinklabs-theme/openthinklabs-3.css' : '../scss/openthinklabs-theme/openthinklabs-3.scss',
'../css/layout.css' : '../scss/layout.scss',
'../css/error-page.css': '../scss/error-page.scss',
'../js/lib/jsTree/themes/css/style.css' : '../js/lib/jsTree/themes/scss/style.scss'
}
},

Jika file scss nya dibuat, tinggal build dengan perintah :

grunt taosass

35. oat-sa/generis-auth-keyvalue

....

36. oat-sa/extension-tao-testcenter

....

37. oat-sa/extension-tao-test-runner-plugins

....

3. extension-tao-clientdiag

taoClientDiagnostic, Browser and OS diagnostic tool

Ektension ini digunakan untuk memeriksa OS dan browser dari client. Untuk demo dapat melihat di : https://florida-auth.taocloud.org///index .

Menu ke extension ini seharusnya dapat otomatis dibuat muncul di halaman login, melalui entrypoint (config/tao/entrypoint.conf.php) tapi dokumentasinya masih minim, jadi sementara, kita kustom (branch extension-tao-clientdiag-custom) dulu dengan mencontoh guestaccess entrypoint.

Hasil diagnostiknya disimpan pada tabel diagnostic_report, untuk informasi detail dapat membaca https://github.com/oat-sa/taohub-articles/blob/master/technical-documentation/tao-clientdiag/results-description.md

5. PCI/PIC (Portable Custom Interactions) development

Untuk pengembangan custom interaction, dapat membaca panduan ini sebagai awalan. Salah satu contoh yg diberikan adalah TextReaderInteraction

TextReaderInteraction

Instalasi pciSamples dapat juga dilakukan dengan command line :

php tao/scripts/installExtension.php pciSamples

Text reader digunakan untuk menampilkan soal berbentuk paragraf. Jika ingin paragraf berdampingan dengan soal-soalnya [4], kita bisa mengaktifkan opsi multi-column, maka kita perlu meng-aktifkan opsi 'multi-column' pada konfigurasi :

config/taoQtiItem/qtiCreator.conf.php

6. extension-tao-task-queue ( taoTaskQueue )

Untuk informasi lebih lanjut terkait extension ini, silahkan baca dokumentasinya https://hub.taotesting.com/techdocs/tao-task-queue/readme-distributed-task-queue atau git reponya https://github.com/oat-sa/extension-tao-task-queue

Server

Apache

Untuk menghindari error yg dijelaskan disini, ubah :

/etc/httpd/conf/modesecurity/modsecurity.conf

and increase this value from 1310720(128K) to higher:

SecRequestBodyLimit 1310720

Nginx

Meskipun Nginx tidak secara resmi didukung, tetapi selama menggunakan Tao dengan nginx, tidak ditemukan kendalam berarti.

Contoh konfigurasi untuk Nginx dapat dilihat di : https://gist.github.com/wildanm/f7446ace51131512acc11a5b1d2d8d35

Untuk menghindari Error: 0 : timeout dari TAO,

Membuat item test secara programatik

Sebagai permulaan, dapat melihat QtiModelTest.php dan https://forum.taotesting.com/discussion/1468/i-need-to-create-qti-item-test-programmaticall, Items QTI v2

Roles

Di TAO ada beberapa roles : Global Manager, Item Author, Lock Manager, Operational Administrator, REST Publisher, Readiness checker, Reviewer Role, System Administrator, Task Queue Manager, Test Author, Test Taker, Test XML Editor

1. Global Manager

2. Item Author

...

3. Lock Manager

...

4. Operational Administrator

...

5. REST Publisher

...

6. Readiness checker

...

7. Reviewer Role

...

8. System Administrator

...

9.Task Queue Manager

...

10. Test Author

...

11. Test Taker

...

12. Test XML Editor

....

Rest API

Rest Services Layer Tutorial

Redis

Untuk skalabilitas TAO, sebaiknya Kita menggunakan Redis, karena jika tidak, ketika test taker, peserta ujian > 200 orang, maka TAO akan kewalahan melayani, jika menggunakan MySQL jika konfigurasinya tidak optimal, CPU usage nya akan sangat tinggi, jika konfigurasi php-fpm, tidak optimal, diawal ujian, ketika peserta > 200 orang, terkang tiba-tiba php-fpm hang. Dengan menggunakan redis, diharapkan, kendala seperti diatas, tidak terjadi lagi.

Konfigurasi yang harus diubah :

config/taoDelivery/execution_service.conf.php
config/generis/uriProvider.conf.php
config/tao/stateStorage.conf.php
config/tao/session.conf.php
config/generis/auth.conf.php
config/generis/persistences.conf.php

config/taoDelivery/execution_service.conf.php

return new oat\taoDelivery\model\execution\implementation\KeyValueService(array(
        'persistence' => 'deliveryExecution'
));

config/generis/uriProvider.conf.php

return new core_kernel_uri_AdvKeyValueUriProvider(
    array(
        'persistence' => 'uriProvider',
        'namespace' => LOCAL_NAMESPACE.'#'
    )
);

config/tao/stateStorage.conf.php

return new tao_models_classes_service_StateStorage(array(
    'persistence' => 'serviceState'
));

config/tao/session.conf.php

return new common_session_php_KeyValueSessionHandler(array(
    common_session_php_KeyValueSessionHandler::OPTION_PERSISTENCE => 'session'
));

config/generis/auth.conf.php

return new oat\oatbox\config\ConfigurationService(array(
    'config' => array(
        array(
            'driver' => 'oat\\authKeyValue\\AuthKeyValueAdapter'
        ),        
        array(
            'driver' => 'oat\\generis\\model\\user\\AuthAdapter',
            'user_factory' => 'generis/userFactory'
        )
    )
));

config/generis/persistences.conf.php

return new oat\generis\persistence\PersistenceManager(array(
    'persistences' => array(
        'default' => array(
            'driver' => 'dbal',
            'connection' => array(
                'driver' => 'pdo_pgsql',
                'driverClass' => null,
                'instance' => null,
                'host' => 'localhost',
                'dbname' => 'dbname',
                'user' => 'username',
                'password' => 'password',
                'driverOptions' => array()
            )
        ),

        'serviceState' => array(
            'driver' => 'phpredis',
            'host' => '127.0.0.1',
            'port' => 6379
            //'driver' => 'phpfile'
        ),
        'cache' => array(
            'driver' => 'phpfile'
        ),
        'session' => array(
            'driver' => 'phpredis',
            'host' => '127.0.0.1',
            'port' => 6379
            //'driver' => 'phpfile'
        ),        
        'deliveryExecution' => array(
            'driver' => 'phpredis',
            'host' => '127.0.0.1',
            'port' => 6379
        ), 
        'uriProvider' => array(
            'driver' => 'phpredis',
            'host' => '127.0.0.1',
            'port' => 6379
        ),
        'authKeyValue' => array(
            'driver' => 'phpredis',
            'host' => '127.0.0.1',
            'port' => 6379
        ),
        'default_kv' => array(
            'driver' => 'phpredis',
            'host' => '127.0.0.1',
            'port' => 6379
            //'driver' => 'phpfile'
        ),                   
        'maintenance' => array(
            'driver' => 'phpfile'
        )
    )
));

php index.php 'oat\authKeyValue\action\ActivateKeyValueAuthentication' --persistence authKeyValue

Installl Redis di Mac :

/usr/local/opt/php\@7.3/bin/pecl install redis

Jika mengalami masalah dengan Tao DeliveryExecution tracking service dengan redis, cara hack sementaranya. dapat dibaca di diskusi ini.

Untuk selengkapnya baca [5]

Bahasa

Untuk mengupdate bahasa, menambah bahasa, seperti bahasa Indonesia di TAO dapat menjalankan perintah :

php tao/scripts/taoTranslate.php -force -v -a create -l id-ID -ll 'Indonesia' -u=username -p=password -e tao,ltiDeliveryProvider,taoGroups,taoMediaManager,taoTests,taoCe,taoItems,taoOutcomeUi,taoTestTaker,taoDelivery,taoQtiItem,taoDeliveryRdf,taoLti,taoQtiTest,taoClientDiagnostic,funcAcl,pciSamples,qtiItemPci,qtiItemPic,taoBackOffice,taoEventLog,taoProctoring,taoResultServer,taoRevision,taoDacSimple

download paket terjemahan untuk versi tao Anda, lalu jalankan :

./pootle_export_to_tao.sh tao34 id-ID .

Lalu agar muncul pada pilihan bahasa, jalankan (cukup dijalankan sekali saja, kalau lebih dari sekali, sistem akan error) :

php tao/scripts/taoRDFImport.php -v -n -u=username -p=password http://www.tao.lu/Ontologies/TAO.rdf# -i tao/locales/id-ID/lang.rdf

Lakukan merge terjemahan :

./merge_all_translations.sh id-ID

Jika ingin membantu penerjamahan TAO kedalam bahasa Indonesia, dapat melalui https://translate.taotesting.com/user/system/

Selengkapnya :

https://hub.taotesting.com/articles/installation-and-upgrading/update-translations-in-tao-with-a-translation-package-from-pootle

MariaDB Crash

Ketika proctoring diaktifkan dengan 151 peserta, database tiba-tiba crash, error lengkapnya dapat dilihat di : https://gist.github.com/wildanm/57c79999894eb1f824793f974c9feda8 . dari lognya, kemungkinan besar, error terjadi karena ada tabel tabel yg masih menggunakan engine MyISAM yg crash, berikut daftar table beserta engine yang digunakan https://gist.github.com/wildanm/7330631eb7d2b835329c71301b812486.

Solusi yang bisa dicoba adalah, mengubah seluruh tabel yang masih menggunakan MyISAM, menjadi InnoDB.

Google Cloud

Connecting Overview CloudSQL for PostgreSQL

Agar ketika VM direstart, cloud sql proxy tetap berjalan, Kita dapat mengikuti langkah-langkah yang dijelaskan disini : https://gist.github.com/goodwill/a981c2912ae6a83761a624f657f34d9f

JMeter

Stress Test TAO dengan JMeter.

Migrasi Server

Baca selengkapnya disini.

Troubleshooting

Debugging

config/generis/log.conf.php

return new oat\oatbox\log\LoggerService(array(
'logger' => array(
'class' => \oat\oatbox\log\logger\TaoMonolog::class,
'options' => array(
'name' => 'tao',
'handlers' => array(
array(
'class' => \Monolog\Handler\StreamHandler::class,
'options' => array(
'/opt/webapps/tao/logs/tao.log',
\Monolog\Logger::DEBUG
)
)
)
)
)));

Selengkapnya. TAO System Debug

Referensi

TAO Hub, https://hub.taotesting.com/
How to remove all content, almost like a fresh installation?, https://forum.taotesting.com/discussion/407/how-to-remove-all-content-almost-like-a-fresh-installation
ACT Invests in Open Assessment Technologies (OAT), the Global Leader for Open Source Assessment Solutions, https://leadershipblog.act.org/2018/09/act-invests-in-open-assessment.html
TAO 3.3.0-sprint71, https://www.loom.com/share/88d46873eacc4a49bfdbad8adc4ea7f9
Data abstractions, https://hub.taotesting.com/articles/administrator-guide/data-abstractions
TAO User Guide, https://www.taotesting.com/user-guide/users/introduction/about-the-guide/
tao-docker, https://gitlab.telecomnancy.univ-lorraine.fr/telecomnancy/tao-docker

Wednesday, 6 May 2020

Ujian Online dengan Sistem Pengawasan Jarak Jauh

...

Referensi

Proctoring-AI, https://github.com/vardanagarwal/Proctoring-AI
Proctortrack, https://www.proctortrack.com/
ProctorExam, Leading online proctoring services, https://proctorexam.com/
Online Exams with Remote Supervision, https://www.iata.org/en/training/exam-information/exam-online-supervised/
Using Zoom to remote proctor an exam, https://community.canvaslms.com/groups/admins/blog/2020/03/15/using-zoom-to-remote-proctor-an-exam

Thursday, 23 April 2020

Belajar Bareng Modelio

...

Referensi

Modelio, The open source extensible modeling environment supporting: UML, BPMN, ArchiMate, SysML, ..., https://www.modelio.org/

Thursday, 19 March 2020

System Dynamics Models

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Referensi

Introduction to System Dynamics Models, https://www.youtube.com/watch?v=IenySRdkRu8
Vensim Free Download, https://vensim.com/free-download/
AnyLogic simulation software, https://www.anylogic.com/
Knime, End to End Data Science, https://www.knime.com/
Octoparse, Easy Web Scraping for Anyone, https://www.octoparse.com/