1. android application related telephony / 2018 / sms, mms, lms, telephony, android, java8, and realm 2. tcp/ip socket network lib / 2018 / c, select, pthread

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1. messenger system / 2016 – 2017 / android, nodejs, kafka, firebase, redis, custom reactive lib (focused on flow and link), docker, java 2. convert native 2d board game client to html / 2017 - minimal direct x to javascript framework (minimal and only some drawing classes) - gif, bitmap serializer and deserializer. - emscripten, direct x, posix, c, c++, gif, bmp, docker, websocketify, linux, and mysql 3. game client and server / 2017 / unity, node js, and mysql 4. game resource serializer, deserializer and packer / 2017 / c++ and zip

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1. android application (share wifi connecting information and automate to connect wifi access point using shared information) / 2016 / reactive x 2. android application (share internet nearby android device) / 2015 – 2016 bluetooth jni performance test (jni, epoll, and bluetooth)

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1. android application (share internet nearby android device) / 2015 – 2016 multiplexing java tcp and bluetooth socket communicator (java, bluetooth, and android) bluetooth jni performance test (jni, epoll, and bluetooth) minimal java tcp stack (tcp/ip) mesh (custom mesh algorithm and dijkstra algorithm) 2. media converter / 2012 / ffmpeg, mysql, linux, and c++ 3. tcp session and performance benchmark application client / 2012 custom tcp/ip socket network framework (epoll, windows iocp) 60,000 session tcp application client 4. push notification session server and system / 2012 custom tcp/ip socket network framework (epoll, windows iocp) network and operating system performance tuning (linux, tcp/ip) 1 million sessions tcp application server (encrypted) 1.5 million sessions tcp application server (not encrypted) scalable horizontally system 5. distributed in-memory cache system (message middleware) / 2012 custom tcp/ip socket network framework (epoll, windows iocp) redis (redis) be able to implement business logic or add custom command using lua script (lua) network and operating system performance tuning (linux, tcp/ip) 5 billions 1024 bytes message req/res during 14 hours (80,000 req/s) / 1 middleware + 3 redis + 1 benchmark client. 6. automated issue tracking system for avn / 2015 issue tracking system (apache, php, mysql and chartjs) rest api server (c++, windows iocp, epoll, and custom http lib) distributed file storage (redis) email notification (curl)

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automation to control door lock using zigbee / android, iphone, tcp based socket server, windows iocp, c++ and mysql / 2011

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